refactor: Use snafu

This should gradtly improve the debugging experience by allowing
tracking backtraces to get more context from the error.
A lot of the touced files here are just cleaning up the old way of
creating errors.

Cargo.lock

@@ -1014,6 +1014,7 @@ dependencies = [
  "nix",
  "num-traits",
  "parking_lot",
+ "paste",
  "rand 0.10.0",
  "rand_core 0.6.4",
  "regex",
@@ -1027,7 +1028,7 @@ dependencies = [
  "serde_regex",
  "smallstr",
  "smallvec",
- "thiserror 2.0.18",
+ "snafu",
  "tikv-jemalloc-ctl",
  "tikv-jemalloc-sys",
  "tikv-jemallocator",
@@ -1154,7 +1155,7 @@ dependencies = [
  "conduwuit_service",
  "futures",
  "rand 0.10.0",
- "thiserror 2.0.18",
+ "snafu",
  "tracing",
 ]
 
@@ -4911,6 +4912,27 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "snafu"
+version = "0.8.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e84b3f4eacbf3a1ce05eac6763b4d629d60cbc94d632e4092c54ade71f1e1a2"
+dependencies = [
+ "snafu-derive",
+]
+
+[[package]]
+name = "snafu-derive"
+version = "0.8.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1c97747dbf44bb1ca44a561ece23508e99cb592e862f22222dcf42f51d1e451"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "socket2"
 version = "0.5.10"

Cargo.toml

@@ -307,9 +307,14 @@ features = [
 ]
 
 # Used for conduwuit::Error type
-[workspace.dependencies.thiserror]
-version = "2.0.12"
+[workspace.dependencies.snafu]
+version = "0.8"
 default-features = false
+features = ["std", "rust_1_81"]
+
+# Used for macro name generation
+[workspace.dependencies.paste]
+version = "1.0"
 
 # Used when hashing the state
 [workspace.dependencies.ring]

src/api/client/account.rs

@@ -3,7 +3,7 @@ use std::fmt::Write;
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use conduwuit::{
-	Err, Error, Event, Result, debug_info, err, error, info,
+	Err, Event, Result, debug_info, err, error, info,
 	matrix::pdu::PduBuilder,
 	utils::{self, ReadyExt, stream::BroadbandExt},
 	warn,
@@ -387,7 +387,7 @@ pub(crate) async fn register_route(
 					)
 					.await?;
 				if !worked {
-					return Err(Error::Uiaa(uiaainfo));
+					return Err!(Uiaa(uiaainfo));
 				}
 				// Success!
 			},
@@ -401,7 +401,7 @@ pub(crate) async fn register_route(
 						&uiaainfo,
 						json,
 					);
-					return Err(Error::Uiaa(uiaainfo));
+					return Err!(Uiaa(uiaainfo));
 				},
 				| _ => {
 					return Err!(Request(NotJson("JSON body is not valid")));
@@ -661,7 +661,7 @@ pub(crate) async fn change_password_route(
 				.await?;
 
 			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			}
 
 			// Success!
@@ -673,7 +673,7 @@ pub(crate) async fn change_password_route(
 					.uiaa
 					.create(sender_user, body.sender_device(), &uiaainfo, json);
 
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			},
 			| _ => {
 				return Err!(Request(NotJson("JSON body is not valid")));
@@ -791,7 +791,7 @@ pub(crate) async fn deactivate_route(
 				.await?;
 
 			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			}
 			// Success!
 		},
@@ -802,7 +802,7 @@ pub(crate) async fn deactivate_route(
 					.uiaa
 					.create(sender_user, body.sender_device(), &uiaainfo, json);
 
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			},
 			| _ => {
 				return Err!(Request(NotJson("JSON body is not valid")));

src/api/client/device.rs

@@ -1,6 +1,6 @@
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
-use conduwuit::{Err, Error, Result, debug, err, utils};
+use conduwuit::{Err, Result, debug, err, utils};
 use futures::StreamExt;
 use ruma::{
 	MilliSecondsSinceUnixEpoch, OwnedDeviceId,
@@ -232,7 +232,7 @@ pub(crate) async fn delete_devices_route(
 				.await?;
 
 			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			}
 			// Success!
 		},
@@ -243,10 +243,10 @@ pub(crate) async fn delete_devices_route(
 					.uiaa
 					.create(sender_user, sender_device, &uiaainfo, json);
 
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			},
 			| _ => {
-				return Err(Error::BadRequest(ErrorKind::NotJson, "Not json."));
+				return Err!(BadRequest(ErrorKind::NotJson, "Not json."));
 			},
 		},
 	}

src/api/client/keys.rs

@@ -5,7 +5,7 @@ use std::{
 
 use axum::extract::State;
 use conduwuit::{
-	Err, Error, Result, debug, debug_warn, err,
+	Err, Result, debug, debug_warn, err,
 	result::NotFound,
 	utils,
 	utils::{IterStream, stream::WidebandExt},
@@ -215,7 +215,7 @@ pub(crate) async fn upload_signing_keys_route(
 						.await?;
 
 					if !worked {
-						return Err(Error::Uiaa(uiaainfo));
+						return Err!(Uiaa(uiaainfo));
 					}
 					// Success!
 				},
@@ -226,10 +226,10 @@ pub(crate) async fn upload_signing_keys_route(
 							.uiaa
 							.create(sender_user, sender_device, &uiaainfo, json);
 
-						return Err(Error::Uiaa(uiaainfo));
+						return Err!(Uiaa(uiaainfo));
 					},
 					| _ => {
-						return Err(Error::BadRequest(ErrorKind::NotJson, "Not json."));
+						return Err!(BadRequest(ErrorKind::NotJson, "Not json."));
 					},
 				},
 			}
@@ -396,12 +396,12 @@ pub(crate) async fn get_key_changes_route(
 	let from = body
 		.from
 		.parse()
-		.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invalid `from`."))?;
+		.map_err(|_| err!(BadRequest(ErrorKind::InvalidParam, "Invalid `from`.")))?;
 
 	let to = body
 		.to
 		.parse()
-		.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invalid `to`."))?;
+		.map_err(|_| err!(BadRequest(ErrorKind::InvalidParam, "Invalid `to`.")))?;
 
 	device_list_updates.extend(
 		services

src/api/client/media.rs

@@ -3,7 +3,7 @@ use std::time::Duration;
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use conduwuit::{
-	Err, Result, err,
+	Err, Result, err, error,
 	utils::{self, content_disposition::make_content_disposition, math::ruma_from_usize},
 };
 use conduwuit_service::{
@@ -69,7 +69,7 @@ pub(crate) async fn create_content_route(
 		.create(mxc, Some(user), Some(&content_disposition), content_type, &body.file)
 		.await
 	{
-		err!("Failed to save uploaded media: {e}");
+		error!("Failed to save uploaded media: {e}");
 		return Err!(Request(Unknown("Failed to save uploaded media")));
 	}
 

src/api/client/message.rs

@@ -1,7 +1,7 @@
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use conduwuit::{
-	Err, Error, Result, at, debug_warn,
+	Err, Result, at, debug_warn,
 	matrix::{
 		event::{Event, Matches},
 		pdu::PduCount,
@@ -322,7 +322,7 @@ where
 
 	if server_ignored {
 		// the sender's server is ignored, so ignore this event
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::SenderIgnored { sender: None },
 			"The sender's server is ignored by this server.",
 		));
@@ -331,7 +331,7 @@ where
 	if user_ignored && !services.config.send_messages_from_ignored_users_to_client {
 		// the recipient of this PDU has the sender ignored, and we're not
 		// configured to send ignored messages to clients
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::SenderIgnored { sender: Some(event.sender().to_owned()) },
 			"You have ignored this sender.",
 		));

src/api/client/push.rs

@@ -1,5 +1,5 @@
 use axum::extract::State;
-use conduwuit::{Err, Error, Result, err};
+use conduwuit::{Err, Result, err};
 use conduwuit_service::Services;
 use ruma::{
 	CanonicalJsonObject, CanonicalJsonValue,
@@ -243,27 +243,27 @@ pub(crate) async fn set_pushrule_route(
 		body.before.as_deref(),
 	) {
 		let err = match error {
-			| InsertPushRuleError::ServerDefaultRuleId => Error::BadRequest(
+			| InsertPushRuleError::ServerDefaultRuleId => err!(BadRequest(
 				ErrorKind::InvalidParam,
 				"Rule IDs starting with a dot are reserved for server-default rules.",
-			),
-			| InsertPushRuleError::InvalidRuleId => Error::BadRequest(
+			)),
+			| InsertPushRuleError::InvalidRuleId => err!(BadRequest(
 				ErrorKind::InvalidParam,
 				"Rule ID containing invalid characters.",
-			),
-			| InsertPushRuleError::RelativeToServerDefaultRule => Error::BadRequest(
+			)),
+			| InsertPushRuleError::RelativeToServerDefaultRule => err!(BadRequest(
 				ErrorKind::InvalidParam,
 				"Can't place a push rule relatively to a server-default rule.",
-			),
-			| InsertPushRuleError::UnknownRuleId => Error::BadRequest(
+			)),
+			| InsertPushRuleError::UnknownRuleId => err!(BadRequest(
 				ErrorKind::NotFound,
 				"The before or after rule could not be found.",
-			),
-			| InsertPushRuleError::BeforeHigherThanAfter => Error::BadRequest(
+			)),
+			| InsertPushRuleError::BeforeHigherThanAfter => err!(BadRequest(
 				ErrorKind::InvalidParam,
 				"The before rule has a higher priority than the after rule.",
-			),
-			| _ => Error::BadRequest(ErrorKind::InvalidParam, "Invalid data."),
+			)),
+			| _ => err!(BadRequest(ErrorKind::InvalidParam, "Invalid data.")),
 		};
 
 		return Err(err);
@@ -433,13 +433,13 @@ pub(crate) async fn delete_pushrule_route(
 		.remove(body.kind.clone(), &body.rule_id)
 	{
 		let err = match error {
-			| RemovePushRuleError::ServerDefault => Error::BadRequest(
+			| RemovePushRuleError::ServerDefault => err!(BadRequest(
 				ErrorKind::InvalidParam,
 				"Cannot delete a server-default pushrule.",
-			),
+			)),
 			| RemovePushRuleError::NotFound =>
-				Error::BadRequest(ErrorKind::NotFound, "Push rule not found."),
-			| _ => Error::BadRequest(ErrorKind::InvalidParam, "Invalid data."),
+				err!(BadRequest(ErrorKind::NotFound, "Push rule not found.")),
+			| _ => err!(BadRequest(ErrorKind::InvalidParam, "Invalid data.")),
 		};
 
 		return Err(err);

src/api/client/room/upgrade.rs

@@ -2,7 +2,7 @@ use std::cmp::max;
 
 use axum::extract::State;
 use conduwuit::{
-	Err, Error, Event, Result, RoomVersion, debug, err, info,
+	Err, Event, Result, RoomVersion, debug, err, info,
 	matrix::{StateKey, pdu::PduBuilder},
 };
 use futures::{FutureExt, StreamExt};
@@ -58,7 +58,7 @@ pub(crate) async fn upgrade_room_route(
 	let sender_user = body.sender_user.as_ref().expect("user is authenticated");
 
 	if !services.server.supported_room_version(&body.new_version) {
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::UnsupportedRoomVersion,
 			"This server does not support that room version.",
 		));
@@ -170,7 +170,7 @@ pub(crate) async fn upgrade_room_route(
 					"creator".into(),
 					json!(&sender_user).try_into().map_err(|e| {
 						info!("Error forming creation event: {e}");
-						Error::BadRequest(ErrorKind::BadJson, "Error forming creation event")
+						err!(BadRequest(ErrorKind::BadJson, "Error forming creation event"))
 					})?,
 				);
 			},
@@ -186,13 +186,13 @@ pub(crate) async fn upgrade_room_route(
 		"room_version".into(),
 		json!(&body.new_version)
 			.try_into()
-			.map_err(|_| Error::BadRequest(ErrorKind::BadJson, "Error forming creation event"))?,
+			.map_err(|_| err!(BadRequest(ErrorKind::BadJson, "Error forming creation event")))?,
 	);
 	create_event_content.insert(
 		"predecessor".into(),
 		json!(predecessor)
 			.try_into()
-			.map_err(|_| Error::BadRequest(ErrorKind::BadJson, "Error forming creation event"))?,
+			.map_err(|_| err!(BadRequest(ErrorKind::BadJson, "Error forming creation event")))?,
 	);
 
 	// Validate creation event content
@@ -203,7 +203,7 @@ pub(crate) async fn upgrade_room_route(
 	)
 	.is_err()
 	{
-		return Err(Error::BadRequest(ErrorKind::BadJson, "Error forming creation event"));
+		return Err!(BadRequest(ErrorKind::BadJson, "Error forming creation event"));
 	}
 
 	let create_event_id = services

src/api/client/session.rs

@@ -3,7 +3,7 @@ use std::time::Duration;
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use conduwuit::{
-	Err, Error, Result, debug, err, info,
+	Err, Result, debug, err, info,
 	utils::{self, ReadyExt, hash},
 	warn,
 };
@@ -191,7 +191,7 @@ pub(crate) async fn handle_login(
 	}
 
 	if services.users.is_locked(&user_id).await? {
-		return Err(Error::BadRequest(ErrorKind::UserLocked, "This account has been locked."));
+		return Err!(BadRequest(ErrorKind::UserLocked, "This account has been locked."));
 	}
 
 	if services.users.is_login_disabled(&user_id).await {
@@ -390,7 +390,7 @@ pub(crate) async fn login_token_route(
 				.await?;
 
 			if !worked {
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			}
 
 			// Success!
@@ -402,7 +402,7 @@ pub(crate) async fn login_token_route(
 					.uiaa
 					.create(sender_user, sender_device, &uiaainfo, json);
 
-				return Err(Error::Uiaa(uiaainfo));
+				return Err!(Uiaa(uiaainfo));
 			},
 			| _ => {
 				return Err!(Request(NotJson("No JSON body was sent when required.")));

src/api/client/to_device.rs

@@ -1,7 +1,7 @@
 use std::collections::BTreeMap;
 
 use axum::extract::State;
-use conduwuit::{Error, Result};
+use conduwuit::{Result, err};
 use conduwuit_service::sending::EduBuf;
 use futures::StreamExt;
 use ruma::{
@@ -66,7 +66,7 @@ pub(crate) async fn send_event_to_device_route(
 
 			let event = event
 				.deserialize_as()
-				.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Event is invalid"))?;
+				.map_err(|_| err!(BadRequest(ErrorKind::InvalidParam, "Event is invalid")))?;
 
 			match target_device_id_maybe {
 				| DeviceIdOrAllDevices::DeviceId(target_device_id) => {

src/api/client/well_known.rs

@@ -1,11 +1,8 @@
 use axum::{Json, extract::State, response::IntoResponse};
-use conduwuit::{Error, Result};
-use ruma::api::client::{
-	discovery::{
-		discover_homeserver::{self, HomeserverInfo, SlidingSyncProxyInfo},
-		discover_support::{self, Contact},
-	},
-	error::ErrorKind,
+use conduwuit::{Err, Result};
+use ruma::api::client::discovery::{
+	discover_homeserver::{self, HomeserverInfo, SlidingSyncProxyInfo},
+	discover_support::{self, Contact},
 };
 
 use crate::Ruma;
@@ -19,7 +16,7 @@ pub(crate) async fn well_known_client(
 ) -> Result<discover_homeserver::Response> {
 	let client_url = match services.config.well_known.client.as_ref() {
 		| Some(url) => url.to_string(),
-		| None => return Err(Error::BadRequest(ErrorKind::NotFound, "Not found.")),
+		| None => return Err!(BadRequest(ErrorKind::NotFound, "Not found.")),
 	};
 
 	Ok(discover_homeserver::Response {
@@ -88,7 +85,7 @@ pub(crate) async fn well_known_support(
 
 	if contacts.is_empty() && support_page.is_none() {
 		// No admin room, no configured contacts, and no support page
-		return Err(Error::BadRequest(ErrorKind::NotFound, "Not found."));
+		return Err!(BadRequest(ErrorKind::NotFound, "Not found."));
 	}
 
 	Ok(discover_support::Response { contacts, support_page })
@@ -105,7 +102,7 @@ pub(crate) async fn syncv3_client_server_json(
 		| Some(url) => url.to_string(),
 		| None => match services.config.well_known.server.as_ref() {
 			| Some(url) => url.to_string(),
-			| None => return Err(Error::BadRequest(ErrorKind::NotFound, "Not found.")),
+			| None => return Err!(BadRequest(ErrorKind::NotFound, "Not found.")),
 		},
 	};
 

src/api/router/auth.rs

@@ -4,7 +4,7 @@ use axum_extra::{
 	headers::{Authorization, authorization::Bearer},
 	typed_header::TypedHeaderRejectionReason,
 };
-use conduwuit::{Err, Error, Result, debug_error, err, warn};
+use conduwuit::{Err, Result, debug_error, err, warn};
 use futures::{
 	TryFutureExt,
 	future::{
@@ -77,7 +77,7 @@ pub(super) async fn auth(
 							// already
 						},
 						| Token::None | Token::Invalid => {
-							return Err(Error::BadRequest(
+							return Err!(BadRequest(
 								ErrorKind::MissingToken,
 								"Missing or invalid access token.",
 							));
@@ -96,7 +96,7 @@ pub(super) async fn auth(
 							// already
 						},
 						| Token::None | Token::Invalid => {
-							return Err(Error::BadRequest(
+							return Err!(BadRequest(
 								ErrorKind::MissingToken,
 								"Missing or invalid access token.",
 							));
@@ -130,10 +130,10 @@ pub(super) async fn auth(
 						appservice_info: None,
 					})
 				} else {
-					Err(Error::BadRequest(ErrorKind::MissingToken, "Missing access token."))
+					Err!(BadRequest(ErrorKind::MissingToken, "Missing access token."))
 				}
 			},
-			| _ => Err(Error::BadRequest(ErrorKind::MissingToken, "Missing access token.")),
+			| _ => Err!(BadRequest(ErrorKind::MissingToken, "Missing access token.")),
 		},
 		| (
 			AuthScheme::AccessToken | AuthScheme::AccessTokenOptional | AuthScheme::None,
@@ -149,7 +149,7 @@ pub(super) async fn auth(
 					&ruma::api::client::session::logout::v3::Request::METADATA
 						| &ruma::api::client::session::logout_all::v3::Request::METADATA
 				) {
-					return Err(Error::BadRequest(
+					return Err!(BadRequest(
 						ErrorKind::UserLocked,
 						"This account has been locked.",
 					));
@@ -174,11 +174,11 @@ pub(super) async fn auth(
 			appservice_info: None,
 		}),
 		| (AuthScheme::ServerSignatures, Token::Appservice(_) | Token::User(_)) =>
-			Err(Error::BadRequest(
+			Err!(BadRequest(
 				ErrorKind::Unauthorized,
 				"Only server signatures should be used on this endpoint.",
 			)),
-		| (AuthScheme::AppserviceToken, Token::User(_)) => Err(Error::BadRequest(
+		| (AuthScheme::AppserviceToken, Token::User(_)) => Err!(BadRequest(
 			ErrorKind::Unauthorized,
 			"Only appservice access tokens should be used on this endpoint.",
 		)),
@@ -196,13 +196,13 @@ pub(super) async fn auth(
 					appservice_info: None,
 				})
 			} else {
-				Err(Error::BadRequest(
+				Err!(BadRequest(
 					ErrorKind::UnknownToken { soft_logout: false },
 					"Unknown access token.",
 				))
 			}
 		},
-		| (_, Token::Invalid) => Err(Error::BadRequest(
+		| (_, Token::Invalid) => Err!(BadRequest(
 			ErrorKind::UnknownToken { soft_logout: false },
 			"Unknown access token.",
 		)),

src/api/server/event_auth.rs

@@ -1,12 +1,9 @@
 use std::{borrow::Borrow, iter::once};
 
 use axum::extract::State;
-use conduwuit::{Err, Error, Result, info, utils::stream::ReadyExt};
+use conduwuit::{Err, Error, Result, err, info, utils::stream::ReadyExt};
 use futures::StreamExt;
-use ruma::{
-	RoomId,
-	api::{client::error::ErrorKind, federation::authorization::get_event_authorization},
-};
+use ruma::{RoomId, api::federation::authorization::get_event_authorization};
 
 use super::AccessCheck;
 use crate::Ruma;
@@ -47,7 +44,7 @@ pub(crate) async fn get_event_authorization_route(
 		.timeline
 		.get_pdu_json(&body.event_id)
 		.await
-		.map_err(|_| Error::BadRequest(ErrorKind::NotFound, "Event not found."))?;
+		.map_err(|_| err!(BadRequest(ErrorKind::NotFound, "Event not found.")))?;
 
 	let room_id_str = event
 		.get("room_id")

src/api/server/invite.rs

@@ -2,7 +2,7 @@ use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use base64::{Engine as _, engine::general_purpose};
 use conduwuit::{
-	Err, Error, PduEvent, Result, err, error,
+	Err, PduEvent, Result, err, error,
 	matrix::{Event, event::gen_event_id},
 	utils::{self, hash::sha256},
 	warn,
@@ -33,7 +33,7 @@ pub(crate) async fn create_invite_route(
 		.await?;
 
 	if !services.server.supported_room_version(&body.room_version) {
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::IncompatibleRoomVersion { room_version: body.room_version.clone() },
 			"Server does not support this room version.",
 		));

src/api/server/make_join.rs

@@ -1,7 +1,7 @@
 use std::borrow::ToOwned;
 
 use axum::extract::State;
-use conduwuit::{Err, Error, Result, debug, debug_info, info, matrix::pdu::PduBuilder, warn};
+use conduwuit::{Err, Result, debug, debug_info, info, matrix::pdu::PduBuilder, warn};
 use conduwuit_service::Services;
 use futures::StreamExt;
 use ruma::{
@@ -80,7 +80,7 @@ pub(crate) async fn create_join_event_template_route(
 
 	let room_version_id = services.rooms.state.get_room_version(&body.room_id).await?;
 	if !body.ver.contains(&room_version_id) {
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::IncompatibleRoomVersion { room_version: room_version_id },
 			"Room version not supported.",
 		));

src/api/server/make_knock.rs

@@ -1,6 +1,6 @@
 use RoomVersionId::*;
 use axum::extract::State;
-use conduwuit::{Err, Error, Result, debug_warn, info, matrix::pdu::PduBuilder, warn};
+use conduwuit::{Err, Result, debug_warn, info, matrix::pdu::PduBuilder, warn};
 use ruma::{
 	RoomVersionId,
 	api::{client::error::ErrorKind, federation::knock::create_knock_event_template},
@@ -67,14 +67,14 @@ pub(crate) async fn create_knock_event_template_route(
 	let room_version_id = services.rooms.state.get_room_version(&body.room_id).await?;
 
 	if matches!(room_version_id, V1 | V2 | V3 | V4 | V5 | V6) {
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::IncompatibleRoomVersion { room_version: room_version_id },
 			"Room version does not support knocking.",
 		));
 	}
 
 	if !body.ver.contains(&room_version_id) {
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::IncompatibleRoomVersion { room_version: room_version_id },
 			"Your homeserver does not support the features required to knock on this room.",
 		));

src/api/server/publicrooms.rs

@@ -1,6 +1,6 @@
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
-use conduwuit::{Error, Result};
+use conduwuit::{Err, Result, err};
 use ruma::{
 	api::{
 		client::error::ErrorKind,
@@ -25,7 +25,7 @@ pub(crate) async fn get_public_rooms_filtered_route(
 		.config
 		.allow_public_room_directory_over_federation
 	{
-		return Err(Error::BadRequest(ErrorKind::forbidden(), "Room directory is not public"));
+		return Err!(BadRequest(ErrorKind::forbidden(), "Room directory is not public"));
 	}
 
 	let response = crate::client::get_public_rooms_filtered_helper(
@@ -38,7 +38,10 @@ pub(crate) async fn get_public_rooms_filtered_route(
 	)
 	.await
 	.map_err(|_| {
-		Error::BadRequest(ErrorKind::Unknown, "Failed to return this server's public room list.")
+		err!(BadRequest(
+			ErrorKind::Unknown,
+			"Failed to return this server's public room list."
+		))
 	})?;
 
 	Ok(get_public_rooms_filtered::v1::Response {
@@ -62,7 +65,7 @@ pub(crate) async fn get_public_rooms_route(
 		.globals
 		.allow_public_room_directory_over_federation()
 	{
-		return Err(Error::BadRequest(ErrorKind::forbidden(), "Room directory is not public"));
+		return Err!(BadRequest(ErrorKind::forbidden(), "Room directory is not public"));
 	}
 
 	let response = crate::client::get_public_rooms_filtered_helper(
@@ -75,7 +78,10 @@ pub(crate) async fn get_public_rooms_route(
 	)
 	.await
 	.map_err(|_| {
-		Error::BadRequest(ErrorKind::Unknown, "Failed to return this server's public room list.")
+		err!(BadRequest(
+			ErrorKind::Unknown,
+			"Failed to return this server's public room list."
+		))
 	})?;
 
 	Ok(get_public_rooms::v1::Response {

src/api/server/query.rs

@@ -1,7 +1,7 @@
 use std::collections::BTreeMap;
 
 use axum::extract::State;
-use conduwuit::{Error, Result, err};
+use conduwuit::{Err, Result, err};
 use futures::StreamExt;
 use get_profile_information::v1::ProfileField;
 use rand::seq::SliceRandom;
@@ -67,17 +67,16 @@ pub(crate) async fn get_profile_information_route(
 		.config
 		.allow_inbound_profile_lookup_federation_requests
 	{
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::forbidden(),
 			"Profile lookup over federation is not allowed on this homeserver.",
 		));
 	}
 
 	if !services.globals.server_is_ours(body.user_id.server_name()) {
-		return Err(Error::BadRequest(
-			ErrorKind::InvalidParam,
-			"User does not belong to this server.",
-		));
+		return Err!(
+			BadRequest(ErrorKind::InvalidParam, "User does not belong to this server.",)
+		);
 	}
 
 	let mut displayname = None;

src/api/server/send.rs

@@ -114,7 +114,7 @@ pub(crate) async fn send_transaction_message_route(
 	);
 	for (id, result) in &results {
 		if let Err(e) = result {
-			if matches!(e, Error::BadRequest(ErrorKind::NotFound, _)) {
+			if matches!(e, Error::BadRequest { kind: ErrorKind::NotFound, .. }) {
 				warn!("Incoming PDU failed {id}: {e:?}");
 			}
 		}

src/api/server/user.rs

@@ -1,7 +1,7 @@
 use std::time::Duration;
 
 use axum::extract::State;
-use conduwuit::{Error, Result};
+use conduwuit::{Err, Result};
 use futures::{FutureExt, StreamExt, TryFutureExt};
 use ruma::api::{
 	client::error::ErrorKind,
@@ -24,7 +24,7 @@ pub(crate) async fn get_devices_route(
 	body: Ruma<get_devices::v1::Request>,
 ) -> Result<get_devices::v1::Response> {
 	if !services.globals.user_is_local(&body.user_id) {
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::InvalidParam,
 			"Tried to access user from other server.",
 		));
@@ -86,10 +86,9 @@ pub(crate) async fn get_keys_route(
 		.iter()
 		.any(|(u, _)| !services.globals.user_is_local(u))
 	{
-		return Err(Error::BadRequest(
-			ErrorKind::InvalidParam,
-			"User does not belong to this server.",
-		));
+		return Err!(
+			BadRequest(ErrorKind::InvalidParam, "User does not belong to this server.",)
+		);
 	}
 
 	let result = get_keys_helper(
@@ -121,7 +120,7 @@ pub(crate) async fn claim_keys_route(
 		.iter()
 		.any(|(u, _)| !services.globals.user_is_local(u))
 	{
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::InvalidParam,
 			"Tried to access user from other server.",
 		));

src/api/server/well_known.rs

@@ -1,6 +1,6 @@
 use axum::extract::State;
-use conduwuit::{Error, Result};
-use ruma::api::{client::error::ErrorKind, federation::discovery::discover_homeserver};
+use conduwuit::{Err, Result};
+use ruma::api::federation::discovery::discover_homeserver;
 
 use crate::Ruma;
 
@@ -14,7 +14,7 @@ pub(crate) async fn well_known_server(
 	Ok(discover_homeserver::Response {
 		server: match services.server.config.well_known.server.as_ref() {
 			| Some(server_name) => server_name.to_owned(),
-			| None => return Err(Error::BadRequest(ErrorKind::NotFound, "Not found.")),
+			| None => return Err!(BadRequest(ErrorKind::NotFound, "Not found.")),
 		},
 	})
 }

src/core/Cargo.toml

@@ -98,7 +98,8 @@ serde-saphyr.workspace = true
 serde.workspace = true
 smallvec.workspace = true
 smallstr.workspace = true
-thiserror.workspace = true
+snafu.workspace = true
+paste.workspace = true
 tikv-jemallocator.optional = true
 tikv-jemallocator.workspace = true
 tikv-jemalloc-ctl.optional = true

src/core/error/err.rs

@@ -45,63 +45,162 @@ macro_rules! Err {
 macro_rules! err {
 	(Request(Forbidden($level:ident!($($args:tt)+)))) => {{
 		let mut buf = String::new();
-		$crate::error::Error::Request(
-			$crate::ruma::api::client::error::ErrorKind::forbidden(),
-			$crate::err_log!(buf, $level, $($args)+),
-			$crate::http::StatusCode::BAD_REQUEST
-		)
+		$crate::error::Error::Request {
+			kind: $crate::ruma::api::client::error::ErrorKind::forbidden(),
+			message: $crate::err_log!(buf, $level, $($args)+),
+			code: $crate::http::StatusCode::BAD_REQUEST,
+			backtrace: Some($crate::snafu::Backtrace::capture()),
+		}
 	}};
 
 	(Request(Forbidden($($args:tt)+))) => {
-		$crate::error::Error::Request(
-			$crate::ruma::api::client::error::ErrorKind::forbidden(),
-			$crate::format_maybe!($($args)+),
-			$crate::http::StatusCode::BAD_REQUEST
-		)
+		{
+			let message: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+			$crate::error::Error::Request {
+				kind: $crate::ruma::api::client::error::ErrorKind::forbidden(),
+				message,
+				code: $crate::http::StatusCode::BAD_REQUEST,
+				backtrace: Some($crate::snafu::Backtrace::capture()),
+			}
+		}
+	};
+
+	(Request(NotFound($level:ident!($($args:tt)+)))) => {{
+		let mut buf = String::new();
+		$crate::error::Error::Request {
+			kind: $crate::ruma::api::client::error::ErrorKind::NotFound,
+			message: $crate::err_log!(buf, $level, $($args)+),
+			code: $crate::http::StatusCode::BAD_REQUEST,
+			backtrace: None,
+		}
+	}};
+
+	(Request(NotFound($($args:tt)+))) => {
+		{
+			let message: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+			$crate::error::Error::Request {
+				kind: $crate::ruma::api::client::error::ErrorKind::NotFound,
+				message,
+				code: $crate::http::StatusCode::BAD_REQUEST,
+				backtrace: None,
+			}
+		}
 	};
 
 	(Request($variant:ident($level:ident!($($args:tt)+)))) => {{
 		let mut buf = String::new();
-		$crate::error::Error::Request(
-			$crate::ruma::api::client::error::ErrorKind::$variant,
-			$crate::err_log!(buf, $level, $($args)+),
-			$crate::http::StatusCode::BAD_REQUEST
-		)
+		$crate::error::Error::Request {
+			kind: $crate::ruma::api::client::error::ErrorKind::$variant,
+			message: $crate::err_log!(buf, $level, $($args)+),
+			code: $crate::http::StatusCode::BAD_REQUEST,
+			backtrace: Some($crate::snafu::Backtrace::capture()),
+		}
 	}};
 
 	(Request($variant:ident($($args:tt)+))) => {
-		$crate::error::Error::Request(
-			$crate::ruma::api::client::error::ErrorKind::$variant,
-			$crate::format_maybe!($($args)+),
-			$crate::http::StatusCode::BAD_REQUEST
-		)
+		{
+			let message: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+			$crate::error::Error::Request {
+				kind: $crate::ruma::api::client::error::ErrorKind::$variant,
+				message,
+				code: $crate::http::StatusCode::BAD_REQUEST,
+				backtrace: Some($crate::snafu::Backtrace::capture()),
+			}
+		}
 	};
 
 	(Config($item:literal, $($args:tt)+)) => {{
 		let mut buf = String::new();
-		$crate::error::Error::Config($item, $crate::err_log!(buf, error, config = %$item, $($args)+))
+		$crate::error::ConfigSnafu {
+			directive: $item,
+			message: $crate::err_log!(buf, error, config = %$item, $($args)+),
+		}.build()
 	}};
 
+	(BadRequest(ErrorKind::NotFound, $($args:tt)+)) => {
+		{
+			let message: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+			$crate::error::Error::Request {
+				kind: $crate::ruma::api::client::error::ErrorKind::NotFound,
+				message,
+				code: $crate::http::StatusCode::BAD_REQUEST,
+				backtrace: None,
+			}
+		}
+	};
+
+	(BadRequest($kind:expr, $($args:tt)+)) => {
+		{
+			let message: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+			$crate::error::BadRequestSnafu {
+				kind: $kind,
+				message,
+			}.build()
+		}
+	};
+
+	(FeatureDisabled($($args:tt)+)) => {
+		{
+			let feature: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+			$crate::error::FeatureDisabledSnafu { feature }.build()
+		}
+	};
+
+	(Federation($server:expr, $error:expr $(,)?)) => {
+		{
+			$crate::error::FederationSnafu {
+				server: $server,
+				error: $error,
+			}.build()
+		}
+	};
+
+	(InconsistentRoomState($message:expr, $room_id:expr $(,)?)) => {
+		{
+			$crate::error::InconsistentRoomStateSnafu {
+				message: $message,
+				room_id: $room_id,
+			}.build()
+		}
+	};
+
+	(Uiaa($info:expr $(,)?)) => {
+		{
+			$crate::error::UiaaSnafu {
+				info: $info,
+			}.build()
+		}
+	};
+
 	($variant:ident($level:ident!($($args:tt)+))) => {{
 		let mut buf = String::new();
-		$crate::error::Error::$variant($crate::err_log!(buf, $level, $($args)+))
+		$crate::paste::paste! {
+			$crate::error::[<$variant Snafu>] {
+				message: $crate::err_log!(buf, $level, $($args)+),
+			}.build()
+		}
 	}};
 
-	($variant:ident($($args:ident),+)) => {
-		$crate::error::Error::$variant($($args),+)
-	};
-
 	($variant:ident($($args:tt)+)) => {
-		$crate::error::Error::$variant($crate::format_maybe!($($args)+))
+		$crate::paste::paste! {
+			{
+				let message: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+				$crate::error::[<$variant Snafu>] { message }.build()
+			}
+		}
 	};
 
 	($level:ident!($($args:tt)+)) => {{
 		let mut buf = String::new();
-		$crate::error::Error::Err($crate::err_log!(buf, $level, $($args)+))
+		let message: std::borrow::Cow<'static, str> = $crate::err_log!(buf, $level, $($args)+);
+		$crate::error::ErrSnafu { message }.build()
 	}};
 
 	($($args:tt)+) => {
-		$crate::error::Error::Err($crate::format_maybe!($($args)+))
+		{
+			let message: std::borrow::Cow<'static, str> = $crate::format_maybe!($($args)+);
+			$crate::error::ErrSnafu { message }.build()
+		}
 	};
 }
 
@@ -134,7 +233,7 @@ macro_rules! err_log {
 		};
 
 		($crate::error::visit)(&mut $out, LEVEL, &__CALLSITE, &mut valueset_all!(__CALLSITE.metadata().fields(), $($fields)+));
-		($out).into()
+		std::borrow::Cow::<'static, str>::from($out)
 	}}
 }
 

src/core/error/mod.rs

@@ -6,151 +6,391 @@ mod serde;
 
 use std::{any::Any, borrow::Cow, convert::Infallible, sync::PoisonError};
 
+use snafu::{IntoError, prelude::*};
+
 pub use self::{err::visit, log::*};
 
-#[derive(thiserror::Error)]
+#[derive(Debug, Snafu)]
+#[snafu(visibility(pub))]
 pub enum Error {
-	#[error("PANIC!")]
-	PanicAny(Box<dyn Any + Send>),
-	#[error("PANIC! {0}")]
-	Panic(&'static str, Box<dyn Any + Send + 'static>),
+	#[snafu(display("PANIC!"))]
+	PanicAny {
+		panic: Box<dyn Any + Send>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("PANIC! {message}"))]
+	Panic {
+		message: &'static str,
+		panic: Box<dyn Any + Send + 'static>,
+		backtrace: snafu::Backtrace,
+	},
 
 	// std
-	#[error(transparent)]
-	Fmt(#[from] std::fmt::Error),
-	#[error(transparent)]
-	FromUtf8(#[from] std::string::FromUtf8Error),
-	#[error("I/O error: {0}")]
-	Io(#[from] std::io::Error),
-	#[error(transparent)]
-	ParseFloat(#[from] std::num::ParseFloatError),
-	#[error(transparent)]
-	ParseInt(#[from] std::num::ParseIntError),
-	#[error(transparent)]
-	Std(#[from] Box<dyn std::error::Error + Send>),
-	#[error(transparent)]
-	ThreadAccessError(#[from] std::thread::AccessError),
-	#[error(transparent)]
-	TryFromInt(#[from] std::num::TryFromIntError),
-	#[error(transparent)]
-	TryFromSlice(#[from] std::array::TryFromSliceError),
-	#[error(transparent)]
-	Utf8(#[from] std::str::Utf8Error),
+	#[snafu(display("Format error: {source}"))]
+	Fmt {
+		source: std::fmt::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("UTF-8 conversion error: {source}"))]
+	FromUtf8 {
+		source: std::string::FromUtf8Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("I/O error: {source}"))]
+	Io {
+		source: std::io::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Parse float error: {source}"))]
+	ParseFloat {
+		source: std::num::ParseFloatError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Parse int error: {source}"))]
+	ParseInt {
+		source: std::num::ParseIntError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Error: {source}"))]
+	Std {
+		source: Box<dyn std::error::Error + Send>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Thread access error: {source}"))]
+	ThreadAccessError {
+		source: std::thread::AccessError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Integer conversion error: {source}"))]
+	TryFromInt {
+		source: std::num::TryFromIntError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Slice conversion error: {source}"))]
+	TryFromSlice {
+		source: std::array::TryFromSliceError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("UTF-8 error: {source}"))]
+	Utf8 {
+		source: std::str::Utf8Error,
+		backtrace: snafu::Backtrace,
+	},
 
 	// third-party
-	#[error(transparent)]
-	CapacityError(#[from] arrayvec::CapacityError),
-	#[error(transparent)]
-	CargoToml(#[from] cargo_toml::Error),
-	#[error(transparent)]
-	Clap(#[from] clap::error::Error),
-	#[error(transparent)]
-	Extension(#[from] axum::extract::rejection::ExtensionRejection),
-	#[error(transparent)]
-	Figment(#[from] figment::error::Error),
-	#[error(transparent)]
-	Http(#[from] http::Error),
-	#[error(transparent)]
-	HttpHeader(#[from] http::header::InvalidHeaderValue),
-	#[error("Join error: {0}")]
-	JoinError(#[from] tokio::task::JoinError),
-	#[error(transparent)]
-	Json(#[from] serde_json::Error),
-	#[error(transparent)]
-	JsParseInt(#[from] ruma::JsParseIntError), // js_int re-export
-	#[error(transparent)]
-	JsTryFromInt(#[from] ruma::JsTryFromIntError), // js_int re-export
-	#[error(transparent)]
-	Path(#[from] axum::extract::rejection::PathRejection),
-	#[error("Mutex poisoned: {0}")]
-	Poison(Cow<'static, str>),
-	#[error("Regex error: {0}")]
-	Regex(#[from] regex::Error),
-	#[error("Request error: {0}")]
-	Reqwest(#[from] reqwest::Error),
-	#[error("{0}")]
-	SerdeDe(Cow<'static, str>),
-	#[error("{0}")]
-	SerdeSer(Cow<'static, str>),
-	#[error(transparent)]
-	TomlDe(#[from] toml::de::Error),
-	#[error(transparent)]
-	TomlSer(#[from] toml::ser::Error),
-	#[error("Tracing filter error: {0}")]
-	TracingFilter(#[from] tracing_subscriber::filter::ParseError),
-	#[error("Tracing reload error: {0}")]
-	TracingReload(#[from] tracing_subscriber::reload::Error),
-	#[error(transparent)]
-	TypedHeader(#[from] axum_extra::typed_header::TypedHeaderRejection),
-	#[error(transparent)]
-	YamlDe(#[from] serde_saphyr::Error),
-	#[error(transparent)]
-	YamlSer(#[from] serde_saphyr::ser_error::Error),
+	#[snafu(display("Capacity error: {source}"))]
+	CapacityError {
+		source: arrayvec::CapacityError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Cargo.toml error: {source}"))]
+	CargoToml {
+		source: cargo_toml::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Clap error: {source}"))]
+	Clap {
+		source: clap::error::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Extension rejection: {source}"))]
+	Extension {
+		source: axum::extract::rejection::ExtensionRejection,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Figment error: {source}"))]
+	Figment {
+		source: figment::error::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("HTTP error: {source}"))]
+	Http {
+		source: http::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Invalid HTTP header value: {source}"))]
+	HttpHeader {
+		source: http::header::InvalidHeaderValue,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Join error: {source}"))]
+	JoinError {
+		source: tokio::task::JoinError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("JSON error: {source}"))]
+	Json {
+		source: serde_json::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("JS parse int error: {source}"))]
+	JsParseInt {
+		source: ruma::JsParseIntError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("JS try from int error: {source}"))]
+	JsTryFromInt {
+		source: ruma::JsTryFromIntError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Path rejection: {source}"))]
+	Path {
+		source: axum::extract::rejection::PathRejection,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Mutex poisoned: {message}"))]
+	Poison {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Regex error: {source}"))]
+	Regex {
+		source: regex::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Request error: {source}"))]
+	Reqwest {
+		source: reqwest::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{message}"))]
+	SerdeDe {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{message}"))]
+	SerdeSer {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("TOML deserialization error: {source}"))]
+	TomlDe {
+		source: toml::de::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("TOML serialization error: {source}"))]
+	TomlSer {
+		source: toml::ser::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Tracing filter error: {source}"))]
+	TracingFilter {
+		source: tracing_subscriber::filter::ParseError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Tracing reload error: {source}"))]
+	TracingReload {
+		source: tracing_subscriber::reload::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Typed header rejection: {source}"))]
+	TypedHeader {
+		source: axum_extra::typed_header::TypedHeaderRejection,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("YAML deserialization error: {source}"))]
+	YamlDe {
+		source: serde_saphyr::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("YAML serialization error: {source}"))]
+	YamlSer {
+		source: serde_saphyr::ser_error::Error,
+		backtrace: snafu::Backtrace,
+	},
 
 	// ruma/conduwuit
-	#[error("Arithmetic operation failed: {0}")]
-	Arithmetic(Cow<'static, str>),
-	#[error("{0}: {1}")]
-	BadRequest(ruma::api::client::error::ErrorKind, &'static str), //TODO: remove
-	#[error("{0}")]
-	BadServerResponse(Cow<'static, str>),
-	#[error(transparent)]
-	CanonicalJson(#[from] ruma::CanonicalJsonError),
-	#[error("There was a problem with the '{0}' directive in your configuration: {1}")]
-	Config(&'static str, Cow<'static, str>),
-	#[error("{0}")]
-	Conflict(Cow<'static, str>), // This is only needed for when a room alias already exists
-	#[error(transparent)]
-	ContentDisposition(#[from] ruma::http_headers::ContentDispositionParseError),
-	#[error("{0}")]
-	Database(Cow<'static, str>),
-	#[error("Feature '{0}' is not available on this server.")]
-	FeatureDisabled(Cow<'static, str>),
-	#[error("Remote server {0} responded with: {1}")]
-	Federation(ruma::OwnedServerName, ruma::api::client::error::Error),
-	#[error("{0} in {1}")]
-	InconsistentRoomState(&'static str, ruma::OwnedRoomId),
-	#[error(transparent)]
-	IntoHttp(#[from] ruma::api::error::IntoHttpError),
-	#[error("{0}")]
-	Ldap(Cow<'static, str>),
-	#[error(transparent)]
-	Mxc(#[from] ruma::MxcUriError),
-	#[error(transparent)]
-	Mxid(#[from] ruma::IdParseError),
-	#[error("from {0}: {1}")]
-	Redaction(ruma::OwnedServerName, ruma::canonical_json::RedactionError),
-	#[error("{0}: {1}")]
-	Request(ruma::api::client::error::ErrorKind, Cow<'static, str>, http::StatusCode),
-	#[error(transparent)]
-	Ruma(#[from] ruma::api::client::error::Error),
-	#[error(transparent)]
-	Signatures(#[from] ruma::signatures::Error),
-	#[error(transparent)]
-	StateRes(#[from] crate::state_res::Error),
-	#[error("uiaa")]
-	Uiaa(ruma::api::client::uiaa::UiaaInfo),
+	#[snafu(display("Arithmetic operation failed: {message}"))]
+	Arithmetic {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{kind}: {message}"))]
+	BadRequest {
+		kind: ruma::api::client::error::ErrorKind,
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{message}"))]
+	BadServerResponse {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Canonical JSON error: {source}"))]
+	CanonicalJson {
+		source: ruma::CanonicalJsonError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display(
+		"There was a problem with the '{directive}' directive in your configuration: {message}"
+	))]
+	Config {
+		directive: &'static str,
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{message}"))]
+	Conflict {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Content disposition error: {source}"))]
+	ContentDisposition {
+		source: ruma::http_headers::ContentDispositionParseError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{message}"))]
+	Database {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Feature '{feature}' is not available on this server."))]
+	FeatureDisabled {
+		feature: Cow<'static, str>,
+	},
+
+	#[snafu(display("Remote server {server} responded with: {error}"))]
+	Federation {
+		server: ruma::OwnedServerName,
+		error: ruma::api::client::error::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{message} in {room_id}"))]
+	InconsistentRoomState {
+		message: &'static str,
+		room_id: ruma::OwnedRoomId,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("HTTP conversion error: {source}"))]
+	IntoHttp {
+		source: ruma::api::error::IntoHttpError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{message}"))]
+	Ldap {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("MXC URI error: {source}"))]
+	Mxc {
+		source: ruma::MxcUriError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Matrix ID parse error: {source}"))]
+	Mxid {
+		source: ruma::IdParseError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("from {server}: {error}"))]
+	Redaction {
+		server: ruma::OwnedServerName,
+		error: ruma::canonical_json::RedactionError,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("{kind}: {message}"))]
+	Request {
+		kind: ruma::api::client::error::ErrorKind,
+		message: Cow<'static, str>,
+		code: http::StatusCode,
+		backtrace: Option<snafu::Backtrace>,
+	},
+
+	#[snafu(display("Ruma error: {source}"))]
+	Ruma {
+		source: ruma::api::client::error::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("Signature error: {source}"))]
+	Signatures {
+		source: ruma::signatures::Error,
+		backtrace: snafu::Backtrace,
+	},
+
+	#[snafu(display("State resolution error: {source}"))]
+	#[snafu(context(false))]
+	StateRes {
+		source: crate::state_res::Error,
+	},
+
+	#[snafu(display("uiaa"))]
+	Uiaa {
+		info: ruma::api::client::uiaa::UiaaInfo,
+	},
 
 	// unique / untyped
-	#[error("{0}")]
-	Err(Cow<'static, str>),
+	#[snafu(display("{message}"))]
+	Err {
+		message: Cow<'static, str>,
+		backtrace: snafu::Backtrace,
+	},
 }
 
 impl Error {
 	#[inline]
 	#[must_use]
-	pub fn from_errno() -> Self { Self::Io(std::io::Error::last_os_error()) }
+	pub fn from_errno() -> Self { IoSnafu {}.into_error(std::io::Error::last_os_error()) }
 
 	//#[deprecated]
+	#[must_use] 
 	pub fn bad_database(message: &'static str) -> Self {
-		crate::err!(Database(error!("{message}")))
+		let message: Cow<'static, str> = message.into();
+		DatabaseSnafu { message }.build()
 	}
 
 	/// Sanitizes public-facing errors that can leak sensitive information.
 	pub fn sanitized_message(&self) -> String {
 		match self {
-			| Self::Database(..) => String::from("Database error occurred."),
-			| Self::Io(..) => String::from("I/O error occurred."),
+			| Self::Database { .. } => String::from("Database error occurred."),
+			| Self::Io { .. } => String::from("I/O error occurred."),
 			| _ => self.message(),
 		}
 	}
@@ -158,8 +398,8 @@ impl Error {
 	/// Generate the error message string.
 	pub fn message(&self) -> String {
 		match self {
-			| Self::Federation(origin, error) => format!("Answer from {origin}: {error}"),
-			| Self::Ruma(error) => response::ruma_error_message(error),
+			| Self::Federation { server, error, .. } => format!("Answer from {server}: {error}"),
+			| Self::Ruma { source, .. } => response::ruma_error_message(source),
 			| _ => format!("{self}"),
 		}
 	}
@@ -170,10 +410,10 @@ impl Error {
 		use ruma::api::client::error::ErrorKind::{FeatureDisabled, Unknown};
 
 		match self {
-			| Self::Federation(_, error) | Self::Ruma(error) =>
-				response::ruma_error_kind(error).clone(),
-			| Self::BadRequest(kind, ..) | Self::Request(kind, ..) => kind.clone(),
-			| Self::FeatureDisabled(..) => FeatureDisabled,
+			| Self::Federation { error, .. } => response::ruma_error_kind(error).clone(),
+			| Self::Ruma { source, .. } => response::ruma_error_kind(source).clone(),
+			| Self::BadRequest { kind, .. } | Self::Request { kind, .. } => kind.clone(),
+			| Self::FeatureDisabled { .. } => FeatureDisabled,
 			| _ => Unknown,
 		}
 	}
@@ -184,13 +424,15 @@ impl Error {
 		use http::StatusCode;
 
 		match self {
-			| Self::Federation(_, error) | Self::Ruma(error) => error.status_code,
-			| Self::Request(kind, _, code) => response::status_code(kind, *code),
-			| Self::BadRequest(kind, ..) => response::bad_request_code(kind),
-			| Self::FeatureDisabled(..) => response::bad_request_code(&self.kind()),
-			| Self::Reqwest(error) => error.status().unwrap_or(StatusCode::INTERNAL_SERVER_ERROR),
-			| Self::Conflict(_) => StatusCode::CONFLICT,
-			| Self::Io(error) => response::io_error_code(error.kind()),
+			| Self::Federation { error, .. } => error.status_code,
+			| Self::Ruma { source, .. } => source.status_code,
+			| Self::Request { kind, code, .. } => response::status_code(kind, *code),
+			| Self::BadRequest { kind, .. } => response::bad_request_code(kind),
+			| Self::FeatureDisabled { .. } => response::bad_request_code(&self.kind()),
+			| Self::Reqwest { source, .. } =>
+				source.status().unwrap_or(StatusCode::INTERNAL_SERVER_ERROR),
+			| Self::Conflict { .. } => StatusCode::CONFLICT,
+			| Self::Io { source, .. } => response::io_error_code(source.kind()),
 			| _ => StatusCode::INTERNAL_SERVER_ERROR,
 		}
 	}
@@ -203,16 +445,46 @@ impl Error {
 	pub fn is_not_found(&self) -> bool { self.status_code() == http::StatusCode::NOT_FOUND }
 }
 
-impl std::fmt::Debug for Error {
-	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-		write!(f, "{}", self.message())
-	}
+// Debug is already derived by Snafu
+
+/// Macro to reduce boilerplate for From implementations using Snafu context
+macro_rules! impl_from_snafu {
+	($source_ty:ty => $context:ident) => {
+		impl From<$source_ty> for Error {
+			fn from(source: $source_ty) -> Self { $context.into_error(source) }
+		}
+	};
+}
+
+/// Macro for From impls that format messages into ErrSnafu or other
+/// message-based contexts
+macro_rules! impl_from_message {
+	($source_ty:ty => $context:ident, $msg:expr) => {
+		impl From<$source_ty> for Error {
+			fn from(source: $source_ty) -> Self {
+				let message: Cow<'static, str> = format!($msg, source).into();
+				$context { message }.build()
+			}
+		}
+	};
+}
+
+/// Macro for From impls with constant messages (no formatting)
+macro_rules! impl_from_const_message {
+	($source_ty:ty => $context:ident, $msg:expr) => {
+		impl From<$source_ty> for Error {
+			fn from(_source: $source_ty) -> Self {
+				let message: Cow<'static, str> = $msg.into();
+				$context { message }.build()
+			}
+		}
+	};
 }
 
 impl<T> From<PoisonError<T>> for Error {
 	#[cold]
 	#[inline(never)]
-	fn from(e: PoisonError<T>) -> Self { Self::Poison(e.to_string().into()) }
+	fn from(e: PoisonError<T>) -> Self { PoisonSnafu { message: e.to_string() }.build() }
 }
 
 #[allow(clippy::fallible_impl_from)]
@@ -224,6 +496,43 @@ impl From<Infallible> for Error {
 	}
 }
 
+// Implementations using the macro
+impl_from_snafu!(std::io::Error => IoSnafu);
+impl_from_snafu!(std::string::FromUtf8Error => FromUtf8Snafu);
+impl_from_snafu!(regex::Error => RegexSnafu);
+impl_from_snafu!(ruma::http_headers::ContentDispositionParseError => ContentDispositionSnafu);
+impl_from_snafu!(ruma::api::error::IntoHttpError => IntoHttpSnafu);
+impl_from_snafu!(ruma::JsTryFromIntError => JsTryFromIntSnafu);
+impl_from_snafu!(ruma::CanonicalJsonError => CanonicalJsonSnafu);
+impl_from_snafu!(axum::extract::rejection::PathRejection => PathSnafu);
+impl_from_snafu!(clap::error::Error => ClapSnafu);
+impl_from_snafu!(ruma::MxcUriError => MxcSnafu);
+impl_from_snafu!(serde_saphyr::ser_error::Error => YamlSerSnafu);
+impl_from_snafu!(toml::de::Error => TomlDeSnafu);
+impl_from_snafu!(http::header::InvalidHeaderValue => HttpHeaderSnafu);
+impl_from_snafu!(serde_json::Error => JsonSnafu);
+
+// Custom implementations using message formatting
+impl_from_const_message!(std::fmt::Error => ErrSnafu, "formatting error");
+impl_from_message!(std::str::Utf8Error => ErrSnafu, "UTF-8 error: {}");
+impl_from_message!(std::num::TryFromIntError => ArithmeticSnafu, "integer conversion error: {}");
+impl_from_message!(tracing_subscriber::reload::Error => ErrSnafu, "tracing reload error: {}");
+impl_from_message!(reqwest::Error => ErrSnafu, "HTTP client error: {}");
+impl_from_message!(ruma::signatures::Error => ErrSnafu, "Signature error: {}");
+impl_from_message!(ruma::IdParseError => ErrSnafu, "ID parse error: {}");
+impl_from_message!(std::num::ParseIntError => ErrSnafu, "Integer parse error: {}");
+impl_from_message!(std::array::TryFromSliceError => ErrSnafu, "Slice conversion error: {}");
+impl_from_message!(tokio::task::JoinError => ErrSnafu, "Task join error: {}");
+impl_from_message!(serde_saphyr::Error => ErrSnafu, "YAML error: {}");
+
+// Generic implementation for CapacityError
+impl<T> From<arrayvec::CapacityError<T>> for Error {
+	fn from(_source: arrayvec::CapacityError<T>) -> Self {
+		let message: Cow<'static, str> = "capacity error: buffer is full".into();
+		ErrSnafu { message }.build()
+	}
+}
+
 #[cold]
 #[inline(never)]
 pub fn infallible(_e: &Infallible) {

src/core/error/panic.rs

@@ -15,13 +15,16 @@ impl Error {
 
 	#[must_use]
 	#[inline]
-	pub fn from_panic(e: Box<dyn Any + Send>) -> Self { Self::Panic(debug::panic_str(&e), e) }
+	pub fn from_panic(e: Box<dyn Any + Send>) -> Self {
+		use super::PanicSnafu;
+		PanicSnafu { message: debug::panic_str(&e), panic: e }.build()
+	}
 
 	#[inline]
 	pub fn into_panic(self) -> Box<dyn Any + Send + 'static> {
 		match self {
-			| Self::Panic(_, e) | Self::PanicAny(e) => e,
-			| Self::JoinError(e) => e.into_panic(),
+			| Self::Panic { panic, .. } | Self::PanicAny { panic, .. } => panic,
+			| Self::JoinError { source, .. } => source.into_panic(),
 			| _ => Box::new(self),
 		}
 	}
@@ -37,8 +40,8 @@ impl Error {
 	#[inline]
 	pub fn is_panic(&self) -> bool {
 		match &self {
-			| Self::Panic(..) | Self::PanicAny(..) => true,
-			| Self::JoinError(e) => e.is_panic(),
+			| Self::Panic { .. } | Self::PanicAny { .. } => true,
+			| Self::JoinError { source, .. } => source.is_panic(),
 			| _ => false,
 		}
 	}

src/core/error/response.rs

@@ -47,8 +47,8 @@ impl axum::response::IntoResponse for Error {
 impl From<Error> for UiaaResponse {
 	#[inline]
 	fn from(error: Error) -> Self {
-		if let Error::Uiaa(uiaainfo) = error {
-			return Self::AuthResponse(uiaainfo);
+		if let Error::Uiaa { info, .. } = error {
+			return Self::AuthResponse(info);
 		}
 
 		let body = ErrorBody::Standard {

src/core/error/serde.rs

@@ -5,9 +5,15 @@ use serde::{de, ser};
 use crate::Error;
 
 impl de::Error for Error {
-	fn custom<T: Display + ToString>(msg: T) -> Self { Self::SerdeDe(msg.to_string().into()) }
+	fn custom<T: Display + ToString>(msg: T) -> Self {
+		let message: std::borrow::Cow<'static, str> = msg.to_string().into();
+		super::SerdeDeSnafu { message }.build()
+	}
 }
 
 impl ser::Error for Error {
-	fn custom<T: Display + ToString>(msg: T) -> Self { Self::SerdeSer(msg.to_string().into()) }
+	fn custom<T: Display + ToString>(msg: T) -> Self {
+		let message: std::borrow::Cow<'static, str> = msg.to_string().into();
+		super::SerdeSerSnafu { message }.build()
+	}
 }

src/core/matrix/pdu/redact.rs

@@ -1,7 +1,7 @@
 use ruma::{RoomVersionId, canonical_json::redact_content_in_place};
 use serde_json::{Value as JsonValue, json, value::to_raw_value};
 
-use crate::{Error, Result, err, implement};
+use crate::{Result, err, implement};
 
 #[implement(super::Pdu)]
 pub fn redact(&mut self, room_version_id: &RoomVersionId, reason: JsonValue) -> Result {
@@ -10,8 +10,15 @@ pub fn redact(&mut self, room_version_id: &RoomVersionId, reason: JsonValue) ->
 	let mut content = serde_json::from_str(self.content.get())
 		.map_err(|e| err!(Request(BadJson("Failed to deserialize content into type: {e}"))))?;
 
-	redact_content_in_place(&mut content, room_version_id, self.kind.to_string())
-		.map_err(|e| Error::Redaction(self.sender.server_name().to_owned(), e))?;
+	redact_content_in_place(&mut content, room_version_id, self.kind.to_string()).map_err(
+		|error| {
+			crate::error::RedactionSnafu {
+				server: self.sender.server_name().to_owned(),
+				error,
+			}
+			.build()
+		},
+	)?;
 
 	let reason = serde_json::to_value(reason).expect("Failed to preserialize reason");
 

src/core/matrix/state_res/benches.rs

@@ -27,7 +27,7 @@ use serde_json::{
 
 use crate::{
 	matrix::{Event, Pdu, pdu::EventHash},
-	state_res::{self as state_res, Error, Result, StateMap},
+	state_res::{self as state_res, Error, Result, StateMap, error::NotFoundSnafu},
 };
 
 static SERVER_TIMESTAMP: AtomicU64 = AtomicU64::new(0);
@@ -170,10 +170,12 @@ struct TestStore<E: Event>(HashMap<OwnedEventId, E>);
 #[allow(unused)]
 impl<E: Event + Clone> TestStore<E> {
 	fn get_event(&self, room_id: &RoomId, event_id: &EventId) -> Result<E> {
-		self.0
-			.get(event_id)
-			.cloned()
-			.ok_or_else(|| Error::NotFound(format!("{} not found", event_id)))
+		self.0.get(event_id).cloned().ok_or_else(|| {
+			NotFoundSnafu {
+				message: format!("{} not found", event_id),
+			}
+			.build()
+		})
 	}
 
 	/// Returns the events that correspond to the `event_ids` sorted in the same

src/core/matrix/state_res/error.rs

@@ -1,23 +1,40 @@
 use serde_json::Error as JsonError;
-use thiserror::Error;
+use snafu::{IntoError, prelude::*};
 
 /// Represents the various errors that arise when resolving state.
-#[derive(Error, Debug)]
+#[derive(Debug, Snafu)]
+#[snafu(visibility(pub))]
 #[non_exhaustive]
 pub enum Error {
 	/// A deserialization error.
-	#[error(transparent)]
-	SerdeJson(#[from] JsonError),
+	#[snafu(display("JSON error: {source}"))]
+	SerdeJson {
+		source: JsonError,
+		backtrace: snafu::Backtrace,
+	},
 
 	/// The given option or version is unsupported.
-	#[error("Unsupported room version: {0}")]
-	Unsupported(String),
+	#[snafu(display("Unsupported room version: {version}"))]
+	Unsupported {
+		version: String,
+		backtrace: snafu::Backtrace,
+	},
 
 	/// The given event was not found.
-	#[error("Not found error: {0}")]
-	NotFound(String),
+	#[snafu(display("Not found error: {message}"))]
+	NotFound {
+		message: String,
+		backtrace: snafu::Backtrace,
+	},
 
 	/// Invalid fields in the given PDU.
-	#[error("Invalid PDU: {0}")]
-	InvalidPdu(String),
+	#[snafu(display("Invalid PDU: {message}"))]
+	InvalidPdu {
+		message: String,
+		backtrace: snafu::Backtrace,
+	},
+}
+
+impl From<serde_json::Error> for Error {
+	fn from(source: serde_json::Error) -> Self { SerdeJsonSnafu.into_error(source) }
 }

src/core/matrix/state_res/event_auth.rs

@@ -24,6 +24,7 @@ use serde_json::{from_str as from_json_str, value::RawValue as RawJsonValue};
 
 use super::{
 	Error, Event, Result, StateEventType, StateKey, TimelineEventType,
+	error::InvalidPduSnafu,
 	power_levels::{
 		deserialize_power_levels, deserialize_power_levels_content_fields,
 		deserialize_power_levels_content_invite, deserialize_power_levels_content_redact,
@@ -383,8 +384,8 @@ where
 			return Ok(false);
 		}
 
-		let target_user =
-			<&UserId>::try_from(state_key).map_err(|e| Error::InvalidPdu(format!("{e}")))?;
+		let target_user = <&UserId>::try_from(state_key)
+			.map_err(|e| InvalidPduSnafu { message: format!("{e}") }.build())?;
 
 		let user_for_join_auth = content
 			.join_authorised_via_users_server
@@ -461,7 +462,7 @@ where
 			?sender_membership_event_content,
 			"Sender membership event content missing membership field"
 		);
-		return Err(Error::InvalidPdu("Missing membership field".to_owned()));
+		return Err(InvalidPduSnafu { message: "Missing membership field" }.build());
 	};
 	let membership_state = membership_state.deserialize()?;
 

src/core/matrix/state_res/mod.rs

@@ -29,18 +29,18 @@ use ruma::{
 };
 use serde_json::from_str as from_json_str;
 
-pub(crate) use self::error::Error;
+pub(crate) use self::error::{Error, InvalidPduSnafu, NotFoundSnafu};
 use self::power_levels::PowerLevelsContentFields;
 pub use self::{
 	event_auth::{auth_check, auth_types_for_event},
 	room_version::RoomVersion,
 };
+use super::{Event, StateKey};
 use crate::{
-	debug, debug_error, err,
-	matrix::{Event, StateKey},
+	debug, debug_error,
 	state_res::room_version::StateResolutionVersion,
 	trace,
-	utils::stream::{BroadbandExt, IterStream, ReadyExt, TryBroadbandExt, WidebandExt},
+	utils::stream::{BroadbandExt, IterStream, ReadyExt, TryBroadbandExt},
 	warn,
 };
 
@@ -118,7 +118,10 @@ where
 			let csg = calculate_conflicted_subgraph(&conflicting, event_fetch)
 				.await
 				.ok_or_else(|| {
-					Error::InvalidPdu("Failed to calculate conflicted subgraph".to_owned())
+					InvalidPduSnafu {
+						message: "Failed to calculate conflicted subgraph",
+					}
+					.build()
 				})?;
 			debug!(count = csg.len(), "conflicted subgraph");
 			trace!(set = ?csg, "conflicted subgraph");
@@ -149,10 +152,11 @@ where
 	let control_events: Vec<_> = all_conflicted
 		.iter()
 		.stream()
-		.wide_filter_map(async |id| {
-			is_power_event_id(id, &event_fetch)
+		.broad_filter_map(async |id| {
+			event_fetch(id.clone())
 				.await
-				.then_some(id.clone())
+				.filter(|event| is_power_event(&event))
+				.map(|_| id.clone())
 		})
 		.collect()
 		.await;
@@ -314,7 +318,10 @@ where
 		trace!(event_id = event_id.as_str(), "fetching event for its auth events");
 		let evt = fetch_event(event_id.clone()).await;
 		if evt.is_none() {
-			err!("could not fetch event {} to calculate conflicted subgraph", event_id);
+			tracing::error!(
+				"could not fetch event {} to calculate conflicted subgraph",
+				event_id
+			);
 			path.pop();
 			continue;
 		}
@@ -402,11 +409,11 @@ where
 	let fetcher = async |event_id: OwnedEventId| {
 		let pl = *event_to_pl
 			.get(&event_id)
-			.ok_or_else(|| Error::NotFound(String::new()))?;
+			.ok_or_else(|| NotFoundSnafu { message: "" }.build())?;
 
 		let ev = fetch_event(event_id)
 			.await
-			.ok_or_else(|| Error::NotFound(String::new()))?;
+			.ok_or_else(|| NotFoundSnafu { message: "" }.build())?;
 
 		Ok((pl, ev.origin_server_ts()))
 	};
@@ -612,9 +619,12 @@ where
 	let events_to_check: Vec<_> = events_to_check
 		.map(Result::Ok)
 		.broad_and_then(async |event_id| {
-			fetch_event(event_id.to_owned())
-				.await
-				.ok_or_else(|| Error::NotFound(format!("Failed to find {event_id}")))
+			fetch_event(event_id.to_owned()).await.ok_or_else(|| {
+				NotFoundSnafu {
+					message: format!("Failed to find {event_id}"),
+				}
+				.build()
+			})
 		})
 		.try_collect()
 		.boxed()
@@ -653,7 +663,7 @@ where
 		trace!(event_id = event.event_id().as_str(), "checking event");
 		let state_key = event
 			.state_key()
-			.ok_or_else(|| Error::InvalidPdu("State event had no state key".to_owned()))?;
+			.ok_or_else(|| InvalidPduSnafu { message: "State event had no state key" }.build())?;
 
 		let auth_types = auth_types_for_event(
 			event.event_type(),
@@ -669,13 +679,14 @@ where
 			trace!("room version uses hashed IDs, manually fetching create event");
 			let create_event_id_raw = event.room_id_or_hash().as_str().replace('!', "$");
 			let create_event_id = EventId::parse(&create_event_id_raw).map_err(|e| {
-				Error::InvalidPdu(format!(
-					"Failed to parse create event ID from room ID/hash: {e}"
-				))
+				InvalidPduSnafu {
+					message: format!("Failed to parse create event ID from room ID/hash: {e}"),
+				}
+				.build()
+			})?;
+			let create_event = fetch_event(create_event_id.into()).await.ok_or_else(|| {
+				NotFoundSnafu { message: "Failed to find create event" }.build()
 			})?;
-			let create_event = fetch_event(create_event_id.into())
-				.await
-				.ok_or_else(|| Error::NotFound("Failed to find create event".into()))?;
 			auth_state.insert(create_event.event_type().with_state_key(""), create_event);
 		}
 		for aid in event.auth_events() {
@@ -686,7 +697,7 @@ where
 				auth_state.insert(
 					ev.event_type()
 						.with_state_key(ev.state_key().ok_or_else(|| {
-							Error::InvalidPdu("State event had no state key".to_owned())
+							InvalidPduSnafu { message: "State event had no state key" }.build()
 						})?),
 					ev.clone(),
 				);
@@ -801,13 +812,13 @@ where
 
 		let event = fetch_event(p.clone())
 			.await
-			.ok_or_else(|| Error::NotFound(format!("Failed to find {p}")))?;
+			.ok_or_else(|| NotFoundSnafu { message: format!("Failed to find {p}") }.build())?;
 
 		pl = None;
 		for aid in event.auth_events() {
-			let ev = fetch_event(aid.to_owned())
-				.await
-				.ok_or_else(|| Error::NotFound(format!("Failed to find {aid}")))?;
+			let ev = fetch_event(aid.to_owned()).await.ok_or_else(|| {
+				NotFoundSnafu { message: format!("Failed to find {aid}") }.build()
+			})?;
 
 			if is_type_and_key(&ev, &TimelineEventType::RoomPowerLevels, "") {
 				pl = Some(aid.to_owned());
@@ -869,9 +880,9 @@ where
 
 		event = None;
 		for aid in sort_ev.auth_events() {
-			let aev = fetch_event(aid.to_owned())
-				.await
-				.ok_or_else(|| Error::NotFound(format!("Failed to find {aid}")))?;
+			let aev = fetch_event(aid.to_owned()).await.ok_or_else(|| {
+				NotFoundSnafu { message: format!("Failed to find {aid}") }.build()
+			})?;
 
 			if is_type_and_key(&aev, &TimelineEventType::RoomPowerLevels, "") {
 				event = Some(aev);
@@ -915,6 +926,7 @@ async fn add_event_and_auth_chain_to_graph<E, F, Fut>(
 	}
 }
 
+#[allow(dead_code)]
 async fn is_power_event_id<E, F, Fut>(event_id: &EventId, fetch: &F) -> bool
 where
 	F: Fn(OwnedEventId) -> Fut + Sync,

src/core/matrix/state_res/room_version.rs

@@ -1,6 +1,6 @@
 use ruma::RoomVersionId;
 
-use super::{Error, Result};
+use super::{Result, error::UnsupportedSnafu};
 
 #[derive(Debug)]
 #[allow(clippy::exhaustive_enums)]
@@ -163,7 +163,11 @@ impl RoomVersion {
 			| RoomVersionId::V10 => Self::V10,
 			| RoomVersionId::V11 => Self::V11,
 			| RoomVersionId::V12 => Self::V12,
-			| ver => return Err(Error::Unsupported(format!("found version `{ver}`"))),
+			| ver =>
+				return Err(UnsupportedSnafu {
+					version: format!("found version `{ver}`"),
+				}
+				.build()),
 		})
 	}
 }

src/core/matrix/state_res/test_utils.rs

@@ -22,7 +22,7 @@ use serde_json::{
 	value::{RawValue as RawJsonValue, to_raw_value as to_raw_json_value},
 };
 
-use super::auth_types_for_event;
+use super::{auth_types_for_event, error::NotFoundSnafu};
 use crate::{
 	Result, RoomVersion, info,
 	matrix::{Event, EventTypeExt, Pdu, StateMap, pdu::EventHash},
@@ -232,7 +232,7 @@ impl<E: Event + Clone> TestStore<E> {
 		self.0
 			.get(event_id)
 			.cloned()
-			.ok_or_else(|| super::Error::NotFound(format!("{event_id} not found")))
+			.ok_or_else(|| NotFoundSnafu { message: format!("{event_id} not found") }.build())
 			.map_err(Into::into)
 	}
 

src/core/mod.rs

@@ -14,9 +14,11 @@ pub mod utils;
 
 pub use ::arrayvec;
 pub use ::http;
+pub use ::paste;
 pub use ::ruma;
 pub use ::smallstr;
 pub use ::smallvec;
+pub use ::snafu;
 pub use ::toml;
 pub use ::tracing;
 pub use config::Config;

src/core/utils/sys/compute.rs

@@ -2,6 +2,8 @@
 
 use std::{cell::Cell, fmt::Debug, path::PathBuf, sync::LazyLock};
 
+use snafu::IntoError;
+
 use crate::{Result, is_equal_to};
 
 type Id = usize;
@@ -142,7 +144,9 @@ pub fn getcpu() -> Result<usize> {
 
 #[cfg(not(target_os = "linux"))]
 #[inline]
-pub fn getcpu() -> Result<usize> { Err(crate::Error::Io(std::io::ErrorKind::Unsupported.into())) }
+pub fn getcpu() -> Result<usize> {
+	Err(crate::error::IoSnafu.into_error(std::io::ErrorKind::Unsupported.into()))
+}
 
 fn query_cores_available() -> impl Iterator<Item = Id> {
 	core_affinity::get_core_ids()

src/database/de.rs

@@ -255,7 +255,10 @@ impl<'a, 'de: 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
 			| "$serde_json::private::RawValue" => visitor.visit_map(self),
 			| "Cbor" => visitor
 				.visit_newtype_struct(&mut minicbor_serde::Deserializer::new(self.record_trail()))
-				.map_err(|e| Self::Error::SerdeDe(e.to_string().into())),
+				.map_err(|e| {
+					let message: std::borrow::Cow<'static, str> = e.to_string().into();
+					conduwuit_core::error::SerdeDeSnafu { message }.build()
+				}),
 
 			| _ => visitor.visit_newtype_struct(self),
 		}
@@ -313,9 +316,10 @@ impl<'a, 'de: 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
 
 		let end = self.pos.saturating_add(BYTES).min(self.buf.len());
 		let bytes: ArrayVec<u8, BYTES> = self.buf[self.pos..end].try_into()?;
-		let bytes = bytes
-			.into_inner()
-			.map_err(|_| Self::Error::SerdeDe("i64 buffer underflow".into()))?;
+		let bytes = bytes.into_inner().map_err(|_| {
+			let message: std::borrow::Cow<'static, str> = "i64 buffer underflow".into();
+			conduwuit_core::error::SerdeDeSnafu { message }.build()
+		})?;
 
 		self.inc_pos(BYTES);
 		visitor.visit_i64(i64::from_be_bytes(bytes))
@@ -345,9 +349,10 @@ impl<'a, 'de: 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
 
 		let end = self.pos.saturating_add(BYTES).min(self.buf.len());
 		let bytes: ArrayVec<u8, BYTES> = self.buf[self.pos..end].try_into()?;
-		let bytes = bytes
-			.into_inner()
-			.map_err(|_| Self::Error::SerdeDe("u64 buffer underflow".into()))?;
+		let bytes = bytes.into_inner().map_err(|_| {
+			let message: std::borrow::Cow<'static, str> = "u64 buffer underflow".into();
+			conduwuit_core::error::SerdeDeSnafu { message }.build()
+		})?;
 
 		self.inc_pos(BYTES);
 		visitor.visit_u64(u64::from_be_bytes(bytes))

src/database/ser.rs

@@ -199,7 +199,10 @@ impl<W: Write> ser::Serializer for &mut Serializer<'_, W> {
 
 				value
 					.serialize(&mut Serializer::new(&mut Writer::new(&mut self.out)))
-					.map_err(|e| Self::Error::SerdeSer(e.to_string().into()))
+					.map_err(|e| {
+						let message: std::borrow::Cow<'static, str> = e.to_string().into();
+						conduwuit_core::error::SerdeSerSnafu { message }.build()
+					})
 			},
 			| _ => unhandled!("Unrecognized serialization Newtype {name:?}"),
 		}

src/router/router.rs

@@ -1,4 +1,4 @@
-use std::sync::Arc;
+use std::{borrow::Cow, sync::Arc};
 
 use axum::{Router, response::IntoResponse};
 use conduwuit::Error;
@@ -18,5 +18,10 @@ pub(crate) fn build(services: &Arc<Services>) -> (Router, Guard) {
 }
 
 async fn not_found(_uri: Uri) -> impl IntoResponse {
-	Error::Request(ErrorKind::Unrecognized, "Not Found".into(), StatusCode::NOT_FOUND)
+	Error::Request {
+		kind: ErrorKind::Unrecognized,
+		message: Cow::Borrowed("Not Found"),
+		code: StatusCode::NOT_FOUND,
+		backtrace: None,
+	}
 }

src/service/appservice/mod.rs

@@ -147,11 +147,11 @@ impl Service {
 		// same appservice)
 		if let Ok(existing) = self.find_from_token(&registration.as_token).await {
 			if existing.registration.id != registration.id {
-				return Err(err!(Request(InvalidParam(
+				return Err!(Request(InvalidParam(
 					"Cannot register appservice: Token is already used by appservice '{}'. \
 					 Please generate a different token.",
 					existing.registration.id
-				))));
+				)));
 			}
 		}
 
@@ -163,10 +163,10 @@ impl Service {
 			.await
 			.is_ok()
 		{
-			return Err(err!(Request(InvalidParam(
+			return Err!(Request(InvalidParam(
 				"Cannot register appservice: The provided token is already in use by a user \
 				 device. Please generate a different token for the appservice."
-			))));
+			)));
 		}
 
 		self.db

src/service/federation/execute.rs

@@ -2,7 +2,7 @@ use std::{fmt::Debug, mem};
 
 use bytes::Bytes;
 use conduwuit::{
-	Err, Error, Result, debug, debug::INFO_SPAN_LEVEL, debug_error, debug_warn, err,
+	Err, Result, debug, debug::INFO_SPAN_LEVEL, debug_error, debug_warn, err,
 	error::inspect_debug_log, implement, trace,
 };
 use http::{HeaderValue, header::AUTHORIZATION};
@@ -179,10 +179,7 @@ async fn into_http_response(
 
 	debug!("Got {status:?} for {method} {url}");
 	if !status.is_success() {
-		return Err(Error::Federation(
-			dest.to_owned(),
-			RumaError::from_http_response(http_response),
-		));
+		return Err!(Federation(dest.to_owned(), RumaError::from_http_response(http_response),));
 	}
 
 	Ok(http_response)

src/service/media/remote.rs

@@ -35,7 +35,7 @@ pub async fn fetch_remote_thumbnail(
 		.fetch_thumbnail_authenticated(mxc, user, server, timeout_ms, dim)
 		.await;
 
-	if let Err(Error::Request(NotFound, ..)) = &result {
+	if let Err(Error::Request { kind: NotFound, .. }) = &result {
 		return self
 			.fetch_thumbnail_unauthenticated(mxc, user, server, timeout_ms, dim)
 			.await;
@@ -67,7 +67,7 @@ pub async fn fetch_remote_content(
 			);
 		});
 
-	if let Err(Error::Request(Unrecognized, ..)) = &result {
+	if let Err(Error::Request { kind: Unrecognized, .. }) = &result {
 		return self
 			.fetch_content_unauthenticated(mxc, user, server, timeout_ms)
 			.await;

src/service/rooms/event_handler/resolve_state.rs

@@ -112,7 +112,14 @@ where
 {
 	let event_fetch = |event_id| self.event_fetch(event_id);
 	let event_exists = |event_id| self.event_exists(event_id);
-	state_res::resolve(room_version, state_sets, auth_chain_sets, &event_fetch, &event_exists)
-		.map_err(|e| err!(error!("State resolution failed: {e:?}")))
-		.await
+	Ok(
+		state_res::resolve(
+			room_version,
+			state_sets,
+			auth_chain_sets,
+			&event_fetch,
+			&event_exists,
+		)
+		.await?,
+	)
 }

src/service/rooms/spaces/pagination_token.rs

@@ -3,7 +3,7 @@ use std::{
 	str::FromStr,
 };
 
-use conduwuit::{Error, Result};
+use conduwuit::{Err, Error, Result};
 use ruma::{UInt, api::client::error::ErrorKind};
 
 use crate::rooms::short::ShortRoomId;
@@ -57,7 +57,7 @@ impl FromStr for PaginationToken {
 		if let Some(token) = pag_tok() {
 			Ok(token)
 		} else {
-			Err(Error::BadRequest(ErrorKind::InvalidParam, "invalid token"))
+			Err!(BadRequest(ErrorKind::InvalidParam, "invalid token"))
 		}
 	}
 }

src/service/rooms/timeline/create.rs

@@ -75,10 +75,7 @@ pub async fn create_hash_and_sign_event(
 			let content: RoomCreateEventContent = serde_json::from_str(content.get())?;
 			Ok(content.room_version)
 		} else {
-			Err(Error::InconsistentRoomState(
-				"non-create event for room of unknown version",
-				room_id,
-			))
+			Err!(InconsistentRoomState("non-create event for room of unknown version", room_id))
 		}
 	}
 	let PduBuilder {
@@ -275,7 +272,9 @@ pub async fn create_hash_and_sign_event(
 		.hash_and_sign_event(&mut pdu_json, &room_version_id)
 	{
 		return match e {
-			| Error::Signatures(ruma::signatures::Error::PduSize) => {
+			| Error::Signatures { source, .. }
+				if matches!(source, ruma::signatures::Error::PduSize) =>
+			{
 				Err!(Request(TooLarge("Message/PDU is too long (exceeds 65535 bytes)")))
 			},
 			| _ => Err!(Request(Unknown(warn!("Signing event failed: {e}")))),

src/service/uiaa/mod.rs

@@ -1,7 +1,7 @@
 use std::{collections::BTreeMap, sync::Arc};
 
 use conduwuit::{
-	Err, Error, Result, SyncRwLock, err, error, implement, utils,
+	Err, Result, SyncRwLock, err, error, implement, utils,
 	utils::{hash, string::EMPTY},
 };
 use database::{Deserialized, Json, Map};
@@ -117,7 +117,7 @@ pub async fn try_auth(
 			} else if let Some(username) = user {
 				username
 			} else {
-				return Err(Error::BadRequest(
+				return Err!(BadRequest(
 					ErrorKind::Unrecognized,
 					"Identifier type not recognized.",
 				));
@@ -125,7 +125,7 @@ pub async fn try_auth(
 
 			#[cfg(not(feature = "element_hacks"))]
 			let Some(UserIdentifier::UserIdOrLocalpart(username)) = identifier else {
-				return Err(Error::BadRequest(
+				return Err!(BadRequest(
 					ErrorKind::Unrecognized,
 					"Identifier type not recognized.",
 				));
@@ -135,7 +135,7 @@ pub async fn try_auth(
 				username.clone(),
 				self.services.globals.server_name(),
 			)
-			.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "User ID is invalid."))?;
+			.map_err(|_| err!(BadRequest(ErrorKind::InvalidParam, "User ID is invalid.")))?;
 
 			// Check if the access token being used matches the credentials used for UIAA
 			if user_id.localpart() != user_id_from_username.localpart() {

src/service/users/mod.rs

@@ -761,13 +761,13 @@ impl Service {
 				.keys
 				.into_values();
 
-			let self_signing_key_id = self_signing_key_ids.next().ok_or(Error::BadRequest(
+			let self_signing_key_id = self_signing_key_ids.next().ok_or(err!(BadRequest(
 				ErrorKind::InvalidParam,
 				"Self signing key contained no key.",
-			))?;
+			)))?;
 
 			if self_signing_key_ids.next().is_some() {
-				return Err(Error::BadRequest(
+				return Err!(BadRequest(
 					ErrorKind::InvalidParam,
 					"Self signing key contained more than one key.",
 				));
@@ -1439,13 +1439,13 @@ pub fn parse_master_key(
 
 	let master_key = master_key
 		.deserialize()
-		.map_err(|_| Error::BadRequest(ErrorKind::InvalidParam, "Invalid master key"))?;
+		.map_err(|_| err!(BadRequest(ErrorKind::InvalidParam, "Invalid master key")))?;
 	let mut master_key_ids = master_key.keys.values();
 	let master_key_id = master_key_ids
 		.next()
-		.ok_or(Error::BadRequest(ErrorKind::InvalidParam, "Master key contained no key."))?;
+		.ok_or(err!(BadRequest(ErrorKind::InvalidParam, "Master key contained no key.")))?;
 	if master_key_ids.next().is_some() {
-		return Err(Error::BadRequest(
+		return Err!(BadRequest(
 			ErrorKind::InvalidParam,
 			"Master key contained more than one key.",
 		));

src/web/Cargo.toml

@@ -25,7 +25,7 @@ axum.workspace = true
 futures.workspace = true
 tracing.workspace = true
 rand.workspace = true
-thiserror.workspace = true
+snafu.workspace = true
 
 [lints]
 workspace = true

src/web/mod.rs

@@ -8,6 +8,7 @@ use axum::{
 };
 use conduwuit_build_metadata::{GIT_REMOTE_COMMIT_URL, GIT_REMOTE_WEB_URL, version_tag};
 use conduwuit_service::state;
+use snafu::{IntoError, prelude::*};
 
 pub fn build() -> Router<state::State> {
 	Router::<state::State>::new()
@@ -48,10 +49,17 @@ async fn logo_handler() -> impl IntoResponse {
 	)
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, Snafu)]
 enum WebError {
-	#[error("Failed to render template: {0}")]
-	Render(#[from] askama::Error),
+	#[snafu(display("Failed to render template: {source}"))]
+	Render {
+		source: askama::Error,
+		backtrace: snafu::Backtrace,
+	},
+}
+
+impl From<askama::Error> for WebError {
+	fn from(source: askama::Error) -> Self { RenderSnafu.into_error(source) }
 }
 
 impl IntoResponse for WebError {
@@ -66,7 +74,7 @@ impl IntoResponse for WebError {
 		let nonce = rand::random::<u64>().to_string();
 
 		let status = match &self {
-			| Self::Render(_) => StatusCode::INTERNAL_SERVER_ERROR,
+			| Self::Render { .. } => StatusCode::INTERNAL_SERVER_ERROR,
 		};
 		let tmpl = Error { nonce: &nonce, err: self };
 		if let Ok(body) = tmpl.render() {

src/web/templates/error.html.j2

@@ -12,8 +12,8 @@ Server Error
 </h1>
 
 {%- match err -%}
-    {% when WebError::Render(err) -%}
-        <pre>{{ err }}</pre>
+    {% when WebError::Render { source, .. } -%}
+        <pre>{{ source }}</pre>
     {% else -%} <p>An error occurred</p>
 {%- endmatch -%}