2022-05-10 11:16:57 +00:00
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use std::net::SocketAddr;
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use std::sync::Arc;
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use async_trait::async_trait;
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use futures::future::Future;
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2022-05-24 10:16:39 +00:00
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use hyper::header::HeaderValue;
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2022-05-10 11:16:57 +00:00
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use hyper::server::conn::AddrStream;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{Body, Request, Response, Server};
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2022-05-24 10:16:39 +00:00
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use hyper::{HeaderMap, StatusCode};
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2022-05-10 11:16:57 +00:00
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use opentelemetry::{
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global,
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metrics::{Counter, ValueRecorder},
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trace::{FutureExt, SpanRef, TraceContextExt, Tracer},
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Context, KeyValue,
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};
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use garage_util::error::Error as GarageError;
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use garage_util::metrics::{gen_trace_id, RecordDuration};
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pub(crate) trait ApiEndpoint: Send + Sync + 'static {
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fn name(&self) -> &'static str;
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fn add_span_attributes(&self, span: SpanRef<'_>);
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}
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2022-05-24 10:16:39 +00:00
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pub trait ApiError: std::error::Error + Send + Sync + 'static {
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fn http_status_code(&self) -> StatusCode;
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fn add_http_headers(&self, header_map: &mut HeaderMap<HeaderValue>);
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fn http_body(&self, garage_region: &str, path: &str) -> Body;
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}
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2022-05-10 11:16:57 +00:00
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#[async_trait]
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pub(crate) trait ApiHandler: Send + Sync + 'static {
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const API_NAME: &'static str;
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const API_NAME_DISPLAY: &'static str;
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type Endpoint: ApiEndpoint;
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2022-05-24 10:16:39 +00:00
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type Error: ApiError;
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2022-05-10 11:16:57 +00:00
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2022-05-24 10:16:39 +00:00
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fn parse_endpoint(&self, r: &Request<Body>) -> Result<Self::Endpoint, Self::Error>;
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2022-05-10 11:16:57 +00:00
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async fn handle(
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&self,
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req: Request<Body>,
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endpoint: Self::Endpoint,
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2022-05-24 10:16:39 +00:00
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) -> Result<Response<Body>, Self::Error>;
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2022-05-10 11:16:57 +00:00
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}
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pub(crate) struct ApiServer<A: ApiHandler> {
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region: String,
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api_handler: A,
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// Metrics
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request_counter: Counter<u64>,
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error_counter: Counter<u64>,
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request_duration: ValueRecorder<f64>,
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}
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impl<A: ApiHandler> ApiServer<A> {
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pub fn new(region: String, api_handler: A) -> Arc<Self> {
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let meter = global::meter("garage/api");
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Arc::new(Self {
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region,
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api_handler,
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request_counter: meter
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.u64_counter(format!("api.{}.request_counter", A::API_NAME))
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.with_description(format!(
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"Number of API calls to the various {} API endpoints",
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A::API_NAME_DISPLAY
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))
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.init(),
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error_counter: meter
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.u64_counter(format!("api.{}.error_counter", A::API_NAME))
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.with_description(format!(
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"Number of API calls to the various {} API endpoints that resulted in errors",
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A::API_NAME_DISPLAY
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))
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.init(),
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request_duration: meter
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.f64_value_recorder(format!("api.{}.request_duration", A::API_NAME))
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.with_description(format!(
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"Duration of API calls to the various {} API endpoints",
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A::API_NAME_DISPLAY
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))
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.init(),
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})
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}
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pub async fn run_server(
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self: Arc<Self>,
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bind_addr: SocketAddr,
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shutdown_signal: impl Future<Output = ()>,
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) -> Result<(), GarageError> {
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let service = make_service_fn(|conn: &AddrStream| {
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let this = self.clone();
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let client_addr = conn.remote_addr();
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async move {
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Ok::<_, GarageError>(service_fn(move |req: Request<Body>| {
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let this = this.clone();
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this.handler(req, client_addr)
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}))
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}
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});
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let server = Server::bind(&bind_addr).serve(service);
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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info!(
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"{} API server listening on http://{}",
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A::API_NAME_DISPLAY,
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bind_addr
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);
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graceful.await?;
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Ok(())
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}
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async fn handler(
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self: Arc<Self>,
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req: Request<Body>,
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addr: SocketAddr,
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) -> Result<Response<Body>, GarageError> {
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let uri = req.uri().clone();
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info!("{} {} {}", addr, req.method(), uri);
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debug!("{:?}", req);
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let tracer = opentelemetry::global::tracer("garage");
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let span = tracer
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.span_builder(format!("{} API call (unknown)", A::API_NAME_DISPLAY))
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.with_trace_id(gen_trace_id())
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.with_attributes(vec![
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KeyValue::new("method", format!("{}", req.method())),
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KeyValue::new("uri", req.uri().to_string()),
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])
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.start(&tracer);
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let res = self
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.handler_stage2(req)
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.with_context(Context::current_with_span(span))
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.await;
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match res {
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Ok(x) => {
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debug!("{} {:?}", x.status(), x.headers());
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Ok(x)
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}
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Err(e) => {
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2022-05-24 10:16:39 +00:00
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let body: Body = e.http_body(&self.region, uri.path());
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2022-05-25 15:05:56 +00:00
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let mut http_error_builder = Response::builder().status(e.http_status_code());
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2022-05-10 11:16:57 +00:00
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if let Some(header_map) = http_error_builder.headers_mut() {
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2022-05-24 10:16:39 +00:00
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e.add_http_headers(header_map)
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2022-05-10 11:16:57 +00:00
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}
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let http_error = http_error_builder.body(body)?;
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if e.http_status_code().is_server_error() {
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warn!("Response: error {}, {}", e.http_status_code(), e);
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} else {
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info!("Response: error {}, {}", e.http_status_code(), e);
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}
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Ok(http_error)
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}
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}
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}
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2022-05-24 10:16:39 +00:00
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async fn handler_stage2(&self, req: Request<Body>) -> Result<Response<Body>, A::Error> {
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2022-05-10 11:16:57 +00:00
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let endpoint = self.api_handler.parse_endpoint(&req)?;
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debug!("Endpoint: {}", endpoint.name());
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let current_context = Context::current();
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let current_span = current_context.span();
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current_span.update_name::<String>(format!("S3 API {}", endpoint.name()));
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current_span.set_attribute(KeyValue::new("endpoint", endpoint.name()));
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endpoint.add_span_attributes(current_span);
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let metrics_tags = &[KeyValue::new("api_endpoint", endpoint.name())];
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let res = self
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.api_handler
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.handle(req, endpoint)
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.record_duration(&self.request_duration, &metrics_tags[..])
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.await;
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self.request_counter.add(1, &metrics_tags[..]);
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let status_code = match &res {
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Ok(r) => r.status(),
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Err(e) => e.http_status_code(),
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};
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if status_code.is_client_error() || status_code.is_server_error() {
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self.error_counter.add(
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1,
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&[
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metrics_tags[0].clone(),
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KeyValue::new("status_code", status_code.as_str().to_string()),
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],
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);
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}
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res
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}
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}
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