lemmy/src/root_span_builder.rs

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use actix_web::{http::StatusCode, ResponseError};
use tracing::Span;
use tracing_actix_web::RootSpanBuilder;
// Code in this module adapted from DefaultRootSpanBuilder
// https://github.com/LukeMathWalker/tracing-actix-web/blob/main/src/root_span_builder.rs
// and root_span!
// https://github.com/LukeMathWalker/tracing-actix-web/blob/main/src/root_span_macro.rs
pub struct QuieterRootSpanBuilder;
impl RootSpanBuilder for QuieterRootSpanBuilder {
fn on_request_start(request: &actix_web::dev::ServiceRequest) -> Span {
let request_id = tracing_actix_web::root_span_macro::private::get_request_id(request);
tracing::info_span!(
"HTTP request",
http.method = %request.method(),
http.scheme = request.connection_info().scheme(),
http.host = %request.connection_info().host(),
http.target = %request.uri().path(),
http.status_code = tracing::field::Empty,
otel.kind = "server",
otel.status_code = tracing::field::Empty,
trace_id = tracing::field::Empty,
request_id = %request_id,
exception.message = tracing::field::Empty,
// Not proper OpenTelemetry, but their terminology is fairly exception-centric
exception.details = tracing::field::Empty,
)
}
fn on_request_end<B>(
span: tracing::Span,
outcome: &Result<actix_web::dev::ServiceResponse<B>, actix_web::Error>,
) {
match &outcome {
Ok(response) => {
if let Some(error) = response.response().error() {
// use the status code already constructed for the outgoing HTTP response
handle_error(span, response.status(), error.as_response_error());
} else {
let code: i32 = response.response().status().as_u16().into();
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span.record("http.status_code", code);
span.record("otel.status_code", "OK");
}
}
Err(error) => {
let response_error = error.as_response_error();
handle_error(span, response_error.status_code(), response_error);
}
};
}
}
fn handle_error(span: Span, status_code: StatusCode, response_error: &dyn ResponseError) {
let code: i32 = status_code.as_u16().into();
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span.record("http.status_code", code);
if status_code.is_client_error() {
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span.record("otel.status_code", "OK");
} else {
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span.record("otel.status_code", "ERROR");
}
// pre-formatting errors is a workaround for https://github.com/tokio-rs/tracing/issues/1565
let display_error = format!("{}", response_error);
let debug_error = format!("{:?}", response_error);
tracing::info_span!(
parent: None,
"Error encountered while processing the incoming HTTP request"
)
.in_scope(|| {
if status_code.is_client_error() {
tracing::warn!("{}\n{}", display_error, debug_error);
} else {
tracing::error!("{}\n{}", display_error, debug_error);
}
});
span.record("exception.message", &tracing::field::display(display_error));
span.record("exception.details", &tracing::field::display(debug_error));
}