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Replay aware logger #48
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| use restate_sdk::prelude::*; | ||
| use std::time::Duration; | ||
| use tracing::info; | ||
| use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, Layer}; | ||
|
|
||
| #[restate_sdk::service] | ||
| trait Greeter { | ||
| async fn greet(name: String) -> Result<String, HandlerError>; | ||
| } | ||
|
|
||
| struct GreeterImpl; | ||
|
|
||
| impl Greeter for GreeterImpl { | ||
| async fn greet(&self, ctx: Context<'_>, name: String) -> Result<String, HandlerError> { | ||
| info!("Before sleep"); | ||
| ctx.sleep(Duration::from_secs(61)).await?; // More than suspension timeout to trigger replay | ||
| info!("After sleep"); | ||
| Ok(format!("Greetings {name}")) | ||
| } | ||
| } | ||
|
|
||
| #[tokio::main] | ||
| async fn main() { | ||
| let env_filter = tracing_subscriber::EnvFilter::try_from_default_env() | ||
| .unwrap_or_else(|_| "info,restate_sdk=debug".into()); | ||
| let replay_filter = restate_sdk::filter::ReplayAwareFilter; | ||
| tracing_subscriber::registry() | ||
| .with( | ||
| tracing_subscriber::fmt::layer() | ||
| .with_filter(env_filter) | ||
| .with_filter(replay_filter), | ||
| ) | ||
| .init(); | ||
| HttpServer::new(Endpoint::builder().bind(GreeterImpl.serve()).build()) | ||
| .listen_and_serve("0.0.0.0:9080".parse().unwrap()) | ||
| .await; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| //! Replay aware tracing filter. | ||
|
|
||
| use std::fmt::Debug; | ||
| use tracing::{ | ||
| field::{Field, Visit}, | ||
| span::{Attributes, Record}, | ||
| Event, Id, Metadata, Subscriber, | ||
| }; | ||
| use tracing_subscriber::{ | ||
| layer::{Context, Filter}, | ||
| registry::LookupSpan, | ||
| Layer, | ||
| }; | ||
|
|
||
| #[derive(Debug)] | ||
| struct ReplayField(bool); | ||
|
|
||
| struct ReplayFieldVisitor(bool); | ||
|
|
||
| impl Visit for ReplayFieldVisitor { | ||
| fn record_bool(&mut self, field: &Field, value: bool) { | ||
| if field.name().eq("restate.sdk.is_replaying") { | ||
| self.0 = value; | ||
| } | ||
| } | ||
|
|
||
| fn record_debug(&mut self, _field: &Field, _value: &dyn Debug) {} | ||
| } | ||
|
|
||
| /// Replay aware tracing filter. | ||
| /// | ||
| /// Use this filter to skip tracing events in the service while replaying: | ||
| /// | ||
| /// ```rust,no_run | ||
| /// use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, Layer}; | ||
| /// tracing_subscriber::registry() | ||
| /// .with( | ||
| /// tracing_subscriber::fmt::layer() | ||
| /// // Default Env filter to read RUST_LOG | ||
| /// .with_filter(tracing_subscriber::EnvFilter::from_default_env()) | ||
| /// // Replay aware filter | ||
| /// .with_filter(restate_sdk::filter::ReplayAwareFilter) | ||
| /// ) | ||
| /// .init(); | ||
| /// ``` | ||
| pub struct ReplayAwareFilter; | ||
|
|
||
| impl<S: Subscriber + for<'lookup> LookupSpan<'lookup>> Filter<S> for ReplayAwareFilter { | ||
| fn enabled(&self, _meta: &Metadata<'_>, _cx: &Context<'_, S>) -> bool { | ||
| true | ||
| } | ||
|
|
||
| fn event_enabled(&self, event: &Event<'_>, cx: &Context<'_, S>) -> bool { | ||
| if let Some(scope) = cx.event_scope(event) { | ||
| let iterator = scope.from_root(); | ||
| for span in iterator { | ||
| if span.name() == "restate_sdk_endpoint_handle" { | ||
| if let Some(replay) = span.extensions().get::<ReplayField>() { | ||
| return !replay.0; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| true | ||
| } | ||
|
|
||
| fn on_new_span(&self, attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, S>) { | ||
| if let Some(span) = ctx.span(id) { | ||
| if span.name() == "restate_sdk_endpoint_handle" { | ||
| let mut visitor = ReplayFieldVisitor(false); | ||
| attrs.record(&mut visitor); | ||
| let mut extensions = span.extensions_mut(); | ||
| extensions.replace::<ReplayField>(ReplayField(visitor.0)); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn on_record(&self, id: &Id, values: &Record<'_>, ctx: Context<'_, S>) { | ||
| if let Some(span) = ctx.span(id) { | ||
| if span.name() == "restate_sdk_endpoint_handle" { | ||
| let mut visitor = ReplayFieldVisitor(false); | ||
| values.record(&mut visitor); | ||
| let mut extensions = span.extensions_mut(); | ||
| extensions.replace::<ReplayField>(ReplayField(visitor.0)); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<S: Subscriber> Layer<S> for ReplayAwareFilter {} |
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