feat: enable Datadog APM error tracking with a tracing layer

auth/src/api/builder.rs

@@ -80,7 +80,7 @@ impl ApiBuilder {
                     request_span!(
                         request,
                         request.params.account_name = field::Empty,
-                        request.params.account_tier = field::Empty
+                        request.params.account_tier = field::Empty,
                     )
                 })
                 .with_propagation()

auth/src/error.rs

@@ -48,8 +48,10 @@ impl IntoResponse for Error {
             }
             _ => {
                 // We only want to emit error events for internal errors, not e.g. 404s.
-                tracing::error!(error = %self, "control plane request error");
-
+                tracing::error!(
+                    error = &self as &(dyn std::error::Error),
+                    "control plane request error"
+                );
                 StatusCode::INTERNAL_SERVER_ERROR
             }
         };

auth/src/user.rs

@@ -112,7 +112,10 @@ impl UserManagement for UserManager {
 
         // Sync the user tier based on the subscription validity, if any.
         if let Err(err) = user.sync_tier(self).await {
-            error!("failed syncing account");
+            error!(
+                error = &err as &dyn std::error::Error,
+                "failed syncing account"
+            );
             return Err(err);
         } else {
             debug!("synced account");

builder/src/lib.rs

@@ -89,7 +89,8 @@ impl Service {
                 Err(err) => {
                     error!(
                         deployment_id,
-                        "unexpected stdout/stderr stream close: {}", err
+                        error = &err as &dyn std::error::Error,
+                        "unexpected stdout/stderr stream close"
                     );
                 }
             }

common/src/backends/metrics.rs

@@ -163,7 +163,9 @@ pub struct OnResponseStatusCode;
 
 impl tower_http::trace::OnResponse<BoxBody> for OnResponseStatusCode {
     fn on_response(self, response: &Response<BoxBody>, latency: Duration, span: &Span) {
-        span.record("http.status_code", response.status().as_u16());
+        // We use set_attribute here because span.record would overwrite the error.message field in
+        // Datadog.
+        span.set_attribute("http.status_code", response.status().as_u16() as i64);
         debug!(
             latency = format_args!("{} ns", latency.as_nanos()),
             "finished processing request"

common/src/backends/otlp_tracing_bridge.rs

@@ -6,9 +6,10 @@
 use opentelemetry::{
     logs::{LogRecord, Logger, LoggerProvider, Severity, TraceContext},
     trace::{SpanContext, TraceFlags, TraceState},
+    KeyValue,
 };
 use std::borrow::Cow;
-use tracing_core::{Level, Subscriber};
+use tracing_core::{field::Visit, Field, Level, Metadata, Subscriber};
 use tracing_opentelemetry::OtelData;
 use tracing_subscriber::{registry::LookupSpan, Layer};
 
@@ -152,3 +153,104 @@ const fn severity_of_level(level: &Level) -> Severity {
         Level::ERROR => Severity::Error,
     }
 }
+
+pub struct ErrorTracingLayer<S> {
+    _registry: std::marker::PhantomData<S>,
+}
+
+impl<S> ErrorTracingLayer<S>
+where
+    S: Subscriber + for<'span> LookupSpan<'span>,
+{
+    pub fn new() -> Self {
+        ErrorTracingLayer {
+            _registry: std::marker::PhantomData,
+        }
+    }
+}
+
+impl<S> Layer<S> for ErrorTracingLayer<S>
+where
+    S: Subscriber + for<'span> LookupSpan<'span>,
+{
+    fn on_event(
+        &self,
+        event: &tracing_core::Event<'_>,
+        ctx: tracing_subscriber::layer::Context<'_, S>,
+    ) {
+        // We only care about error events.
+        if !ErrorVisitor::is_valid(event.metadata()) {
+            return;
+        }
+
+        let mut visitor = ErrorVisitor::default();
+        event.record(&mut visitor);
+
+        let DatadogError {
+            message,
+            r#type,
+            stack,
+        } = visitor.error;
+
+        if let Some(span) = ctx.lookup_current() {
+            if let Some(otel_data) = span.extensions_mut().get_mut::<OtelData>() {
+                let error_fields = [
+                    KeyValue::new("error.message", message),
+                    KeyValue::new("error.type", r#type),
+                    KeyValue::new("error.stack", stack),
+                ];
+                let builder_attrs = otel_data
+                    .builder
+                    .attributes
+                    .get_or_insert(Vec::with_capacity(3));
+                builder_attrs.extend(error_fields);
+            }
+        };
+    }
+}
+
+#[derive(Default, Debug)]
+pub struct DatadogError {
+    pub message: String,
+    pub r#type: String,
+    pub stack: String,
+}
+#[derive(Default)]
+struct ErrorVisitor {
+    error: DatadogError,
+}
+
+impl ErrorVisitor {
+    /// We only care about error events.
+    fn is_valid(metadata: &Metadata) -> bool {
+        metadata.is_event() && metadata.level() == &Level::ERROR
+    }
+}
+
+impl Visit for ErrorVisitor {
+    fn record_debug(&mut self, _field: &Field, _value: &dyn std::fmt::Debug) {
+        // This visitor is only concerned with recording errors, do nothing for debug fields.
+    }
+    fn record_error(&mut self, _field: &Field, value: &(dyn std::error::Error + 'static)) {
+        // Create an error source chain, including the top-level error.
+        let source_chain = {
+            // Datadog expects there to be at least two lines in the stack field for the apm error
+            // tracking feature to work, so we ensure there always is.
+            let mut chain: String = format!("Error source chain:\n{}", value);
+            let mut next_err = value.source();
+
+            while let Some(err) = next_err {
+                chain.push_str(&format!("\n{}", err));
+                next_err = err.source();
+            }
+
+            chain
+        };
+
+        let error_msg = value.to_string();
+
+        self.error.message = error_msg;
+        self.error.r#type = "Error".to_string();
+        self.error.stack = source_chain;
+    }
+}

common/src/backends/trace.rs

@@ -19,7 +19,7 @@ use tracing_subscriber::{fmt, prelude::*, registry::LookupSpan, EnvFilter};
 
 use crate::log::Backend;
 
-use super::otlp_tracing_bridge;
+use super::otlp_tracing_bridge::{self, ErrorTracingLayer};
 
 const OTLP_ADDRESS: &str = "http://otel-collector:4317";
 
@@ -80,8 +80,11 @@ where
     subscriber
         .with(filter_layer)
         .with(fmt_layer)
-        .with(otel_layer)
         .with(appender_tracing_layer)
+        .with(otel_layer)
+        // The error layer needs to go after the otel_layer, because it needs access to the
+        // otel_data extension that is set on the span in the otel_layer.
+        .with(ErrorTracingLayer::new())
         .init();
 }
 

deployer/src/deployment/queue.rs

@@ -96,7 +96,11 @@ pub async fn task(
                                         let response = inner.into_inner();
                                         info!(id = %queued.id, "shuttle-builder finished building the deployment: image length is {} bytes, is_wasm flag is {} and there are {} secrets", response.image.len(), response.is_wasm, response.secrets.len());
                                     },
-                                    Err(err) => error!(id = %queued.id, "shuttle-builder errored while building: {}", err)
+                                    Err(err) => error!(
+                                        id = %queued.id,
+                                        error = &err as &dyn std::error::Error,
+                                        "shuttle-builder errored while building"
+                                    )
                                 };
                             });
                         }
@@ -126,7 +130,7 @@ pub async fn task(
             Some(res) = tasks.join_next() => {
                 match res {
                     Ok(_) => (),
-                    Err(err) => error!(error = %err, "an error happened while joining a builder task"),
+                    Err(err) => error!(error = &err as &dyn std::error::Error, "an error happened while joining a builder task"),
                 }
             }
             else => break
@@ -395,20 +399,24 @@ async fn run_pre_deploy_tests(
     tokio::spawn(async move {
         let mut lines = reader.lines();
         while let Some(line) = lines.next_line().await.unwrap() {
-            let _ = tx
-                .send(line)
-                .await
-                .map_err(|e| error!(error = %e, "failed to send line"));
+            let _ = tx.send(line).await.map_err(|err| {
+                error!(
+                    error = &err as &dyn std::error::Error,
+                    "failed to send line"
+                )
+            });
         }
     });
     let reader = tokio::io::BufReader::new(handle.stderr.take().unwrap());
     tokio::spawn(async move {
         let mut lines = reader.lines();
         while let Some(line) = lines.next_line().await.unwrap() {
-            let _ = tx2
-                .send(line)
-                .await
-                .map_err(|e| error!(error = %e, "failed to send line"));
+            let _ = tx2.send(line).await.map_err(|err| {
+                error!(
+                    error = &err as &dyn std::error::Error,
+                    "failed to send line"
+                )
+            });
         }
     });
     let status = handle.wait().await.map_err(TestError::Run)?;

deployer/src/deployment/run.rs

@@ -129,7 +129,10 @@ pub async fn task(
                 match res {
                     Ok(_) => (),
                     Err(err) => {
-                        error!(error = %err, "an error happened while joining a deployment run task")
+                        error!(
+                            error = &err as &dyn std::error::Error,
+                            "an error happened while joining a deployment run task"
+                        )
                     }
                 }
 
@@ -318,7 +321,10 @@ async fn load(
         .filter_map(|resource| {
             resource
                 .map_err(|err| {
-                    error!(error = ?err, "failed to parse resource data");
+                    error!(
+                        error = err.as_ref() as &dyn std::error::Error,
+                        "failed to parse resource data"
+                    );
                 })
                 .ok()
         })
@@ -333,7 +339,10 @@ async fn load(
                         secrets = combined;
                     }
                     Err(err) => {
-                        error!(error = ?err, "failed to parse old secrets data");
+                        error!(
+                            error = &err as &dyn std::error::Error,
+                            "failed to parse old secrets data"
+                        );
                     }
                 }
             }
@@ -387,13 +396,21 @@ async fn load(
             if response.success {
                 Ok(())
             } else {
-                error!(error = %response.message, "failed to load service");
-                Err(Error::Load(response.message))
+                let error = Error::Load(response.message);
+                error!(
+                    error = &error as &dyn std::error::Error,
+                    "failed to load service"
+                );
+                Err(error)
             }
         }
         Err(error) => {
-            error!(%error, "failed to load service");
-            Err(Error::Load(error.to_string()))
+            let error = Error::Load(error.to_string());
+            error!(
+                error = &error as &dyn std::error::Error,
+                "failed to load service"
+            );
+            Err(error)
         }
     }
 }
@@ -451,11 +468,13 @@ async fn run(
             }));
         }
         Err(ref status) => {
-            error!(%status, "failed to start service");
-            start_crashed_cleanup(
-                &id,
-                Error::Start("runtime failed to start deployment".to_string()),
+            let error = Error::Start("runtime failed to start deployment".to_string());
+            error!(
+                %status,
+                error = &error as &dyn std::error::Error,
+                "failed to start service"
             );
+            start_crashed_cleanup(&id, error);
         }
     }
 }

deployer/src/handlers/mod.rs

@@ -235,7 +235,10 @@ pub async fn get_service_resources(
         .filter_map(|resource| {
             resource
                 .map_err(|err| {
-                    error!(error = ?err, "failed to parse resource data");
+                    error!(
+                        error = err.as_ref() as &dyn std::error::Error,
+                        "failed to parse resource data"
+                    );
                 })
                 .ok()
         })
@@ -477,7 +480,10 @@ pub async fn get_logs(
                 .collect(),
         )),
         Err(error) => {
-            error!(error = %error, "failed to retrieve logs for deployment");
+            error!(
+                error = &error as &dyn std::error::Error,
+                "failed to retrieve logs for deployment"
+            );
             Err(anyhow!("failed to retrieve logs for deployment").into())
         }
     }
@@ -600,7 +606,7 @@ where
         state: &S,
     ) -> std::result::Result<Self, Self::Rejection> {
         let bytes = Bytes::from_request(req, state).await.map_err(|_| {
-            error!("failed to collect body bytes, is the body too large?");
+            info!("failed to collect body bytes, is the body too large?");
             StatusCode::PAYLOAD_TOO_LARGE
         })?;
 

deployer/src/persistence/deployment.rs

@@ -30,7 +30,10 @@ impl FromRow<'_, SqliteRow> for Deployment {
             match SocketAddr::from_str(&address_str) {
                 Ok(address) => Some(address),
                 Err(err) => {
-                    error!(error = %err, "failed to parse address from DB");
+                    error!(
+                        error = &err as &dyn std::error::Error,
+                        "failed to parse address from DB"
+                    );
                     None
                 }
             }

deployer/src/runtime_manager.rs

@@ -150,8 +150,10 @@ impl RuntimeManager {
             match process.start_kill() {
                 Ok(_) => info!(deployment_id = %id, "initiated runtime process killing"),
                 Err(err) => error!(
-                    deployment_id = %id, "failed to start the killing of the runtime: {}",
-                    err
+                    deployment_id = %id,
+                    error = &err as &dyn std::error::Error,
+                    "failed to start the killing of the runtime",
+
                 ),
             }
         }