forked from Deuxfleurs/garage
339 lines
9.2 KiB
Rust
339 lines
9.2 KiB
Rust
use std::{borrow::Cow, convert::Infallible, net::SocketAddr, sync::Arc};
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use futures::future::Future;
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use hyper::{
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header::{HeaderValue, HOST},
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server::conn::AddrStream,
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service::{make_service_fn, service_fn},
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Body, Method, Request, Response, Server,
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};
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use opentelemetry::{
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global,
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metrics::{Counter, ValueRecorder},
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trace::{FutureExt, TraceContextExt, Tracer},
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Context, KeyValue,
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};
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use crate::error::*;
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use garage_api::helpers::{authority_to_host, host_to_bucket};
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use garage_api::s3::cors::{add_cors_headers, find_matching_cors_rule, handle_options_for_bucket};
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use garage_api::s3::error::{
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CommonErrorDerivative, Error as ApiError, OkOrBadRequest, OkOrInternalError,
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};
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use garage_api::s3::get::{handle_get, handle_head};
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use garage_model::garage::Garage;
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use garage_table::*;
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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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struct WebMetrics {
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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 WebMetrics {
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fn new() -> Self {
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let meter = global::meter("garage/web");
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Self {
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request_counter: meter
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.u64_counter("web.request_counter")
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.with_description("Number of requests to the web endpoint")
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.init(),
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error_counter: meter
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.u64_counter("web.error_counter")
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.with_description("Number of requests to the web endpoint resulting in errors")
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.init(),
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request_duration: meter
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.f64_value_recorder("web.request_duration")
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.with_description("Duration of requests to the web endpoint")
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.init(),
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}
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}
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}
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pub struct WebServer {
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garage: Arc<Garage>,
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metrics: Arc<WebMetrics>,
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root_domain: String,
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}
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impl WebServer {
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/// Run a web server
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pub async fn run(
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garage: Arc<Garage>,
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addr: SocketAddr,
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root_domain: String,
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shutdown_signal: impl Future<Output = ()>,
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) -> Result<(), GarageError> {
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let metrics = Arc::new(WebMetrics::new());
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let web_server = Arc::new(WebServer {
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garage,
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metrics,
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root_domain,
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});
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let service = make_service_fn(|conn: &AddrStream| {
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let web_server = web_server.clone();
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let client_addr = conn.remote_addr();
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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let web_server = web_server.clone();
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web_server.handle_request(req, client_addr)
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}))
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}
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});
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let server = Server::bind(&addr).serve(service);
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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info!("Web server listening on http://{}", addr);
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graceful.await?;
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Ok(())
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}
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async fn handle_request(
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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>, Infallible> {
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info!("{} {} {}", addr, req.method(), req.uri());
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// Lots of instrumentation
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let tracer = opentelemetry::global::tracer("garage");
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let span = tracer
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.span_builder(format!("Web {} request", req.method()))
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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 metrics_tags = &[KeyValue::new("method", req.method().to_string())];
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// The actual handler
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let res = self
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.serve_file(&req)
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.with_context(Context::current_with_span(span))
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.record_duration(&self.metrics.request_duration, &metrics_tags[..])
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.await;
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// More instrumentation
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self.metrics.request_counter.add(1, &metrics_tags[..]);
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// Returning the result
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match res {
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Ok(res) => {
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debug!("{} {} {}", req.method(), res.status(), req.uri());
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Ok(res)
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}
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Err(error) => {
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info!(
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"{} {} {} {}",
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req.method(),
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error.http_status_code(),
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req.uri(),
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error
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);
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self.metrics.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", error.http_status_code().to_string()),
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],
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);
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Ok(error_to_res(error))
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}
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}
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}
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async fn serve_file(self: &Arc<Self>, req: &Request<Body>) -> Result<Response<Body>, Error> {
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// Get http authority string (eg. [::1]:3902 or garage.tld:80)
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let authority = req
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.headers()
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.get(HOST)
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.ok_or_bad_request("HOST header required")?
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.to_str()?;
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// Get bucket
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let host = authority_to_host(authority)?;
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let bucket_name = host_to_bucket(&host, &self.root_domain).unwrap_or(&host);
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let bucket_id = self
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.garage
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.bucket_alias_table
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.get(&EmptyKey, &bucket_name.to_string())
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.await?
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.and_then(|x| x.state.take())
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.ok_or(Error::NotFound)?;
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// Check bucket isn't deleted and has website access enabled
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let bucket = self
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.garage
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.bucket_table
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.get(&EmptyKey, &bucket_id)
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.await?
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.ok_or(Error::NotFound)?;
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let website_config = bucket
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.params()
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.ok_or(Error::NotFound)?
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.website_config
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.get()
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.as_ref()
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.ok_or(Error::NotFound)?;
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// Get path
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let path = req.uri().path().to_string();
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let index = &website_config.index_document;
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let key = path_to_key(&path, index)?;
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debug!(
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"Selected bucket: \"{}\" {:?}, selected key: \"{}\"",
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bucket_name, bucket_id, key
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);
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let ret_doc = match *req.method() {
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Method::OPTIONS => handle_options_for_bucket(req, &bucket),
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Method::HEAD => handle_head(self.garage.clone(), req, bucket_id, &key, None).await,
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Method::GET => handle_get(self.garage.clone(), req, bucket_id, &key, None).await,
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_ => Err(ApiError::bad_request("HTTP method not supported")),
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}
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.map_err(Error::from);
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match ret_doc {
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Err(error) => {
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// For a HEAD or OPTIONS method, and for non-4xx errors,
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// we don't return the error document as content,
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// we return above and just return the error message
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// by relying on err_to_res that is called when we return an Err.
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if *req.method() == Method::HEAD
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|| *req.method() == Method::OPTIONS
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|| !error.http_status_code().is_client_error()
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{
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return Err(error);
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}
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// If no error document is set: just return the error directly
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let error_document = match &website_config.error_document {
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Some(ed) => ed.trim_start_matches('/').to_owned(),
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None => return Err(error),
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};
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// We want to return the error document
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// Create a fake HTTP request with path = the error document
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let req2 = Request::builder()
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.uri(format!("http://{}/{}", host, &error_document))
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.body(Body::empty())
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.unwrap();
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match handle_get(self.garage.clone(), &req2, bucket_id, &error_document, None).await
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{
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Ok(mut error_doc) => {
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// The error won't be logged back in handle_request,
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// so log it here
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info!(
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"{} {} {} {}",
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req.method(),
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req.uri(),
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error.http_status_code(),
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error
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);
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*error_doc.status_mut() = error.http_status_code();
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// Preserve error message in a special header
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for error_line in error.to_string().split('\n') {
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if let Ok(v) = HeaderValue::from_bytes(error_line.as_bytes()) {
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error_doc.headers_mut().append("X-Garage-Error", v);
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}
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}
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Ok(error_doc)
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}
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Err(error_doc_error) => {
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warn!(
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"Couldn't get error document {} for bucket {:?}: {}",
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error_document, bucket_id, error_doc_error
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);
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Err(error)
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}
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}
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}
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Ok(mut resp) => {
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// Maybe add CORS headers
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if let Some(rule) = find_matching_cors_rule(&bucket, req)? {
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add_cors_headers(&mut resp, rule)
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.ok_or_internal_error("Invalid bucket CORS configuration")?;
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}
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Ok(resp)
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}
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}
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}
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}
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fn error_to_res(e: Error) -> Response<Body> {
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// If we are here, it is either that:
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// - there was an error before trying to get the requested URL
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// from the bucket (e.g. bucket not found)
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// - there was an error processing the request and (the request
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// was a HEAD request or we couldn't get the error document)
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// We do NOT enter this code path when returning the bucket's
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// error document (this is handled in serve_file)
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let body = Body::from(format!("{}\n", e));
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let mut http_error = Response::new(body);
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*http_error.status_mut() = e.http_status_code();
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e.add_headers(http_error.headers_mut());
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http_error
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}
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/// Path to key
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///
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/// Convert the provided path to the internal key
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/// When a path ends with "/", we append the index name to match traditional web server behavior
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/// which is also AWS S3 behavior.
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fn path_to_key<'a>(path: &'a str, index: &str) -> Result<Cow<'a, str>, Error> {
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let path_utf8 = percent_encoding::percent_decode_str(path).decode_utf8()?;
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if !path_utf8.starts_with('/') {
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return Err(Error::BadRequest("Path must start with a / (slash)".into()));
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}
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match path_utf8.chars().last() {
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None => unreachable!(),
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Some('/') => {
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let mut key = String::with_capacity(path_utf8.len() + index.len());
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key.push_str(&path_utf8[1..]);
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key.push_str(index);
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Ok(key.into())
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}
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Some(_) => match path_utf8 {
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Cow::Borrowed(pu8) => Ok((&pu8[1..]).into()),
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Cow::Owned(pu8) => Ok(pu8[1..].to_string().into()),
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},
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn path_to_key_test() -> Result<(), Error> {
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assert_eq!(path_to_key("/file%20.jpg", "index.html")?, "file .jpg");
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assert_eq!(path_to_key("/%20t/", "index.html")?, " t/index.html");
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assert_eq!(path_to_key("/", "index.html")?, "index.html");
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assert_eq!(path_to_key("/hello", "index.html")?, "hello");
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assert!(path_to_key("", "index.html").is_err());
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assert!(path_to_key("i/am/relative", "index.html").is_err());
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Ok(())
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}
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}
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