tower_web/middleware/log/
service.rs

1use futures::{Future, Poll};
2use http;
3use log::{logger, Level, Record};
4use tower_service::Service;
5
6use std::time::Instant;
7
8/// Decorates a service by logging all received requests
9#[derive(Debug)]
10pub struct LogService<S> {
11    inner: S,
12    target: &'static str,
13}
14
15/// Log the received request once the response has been processed.
16#[derive(Debug)]
17pub struct ResponseFuture<T> {
18    inner: T,
19    context: Option<LogContext>,
20}
21
22#[derive(Debug)]
23struct LogContext {
24    method: http::Method,
25    path: Option<http::uri::PathAndQuery>,
26    version: http::Version,
27    start: Instant,
28    target: &'static str,
29}
30
31impl<S> LogService<S> {
32    pub(super) fn new(inner: S, target: &'static str) -> LogService<S> {
33        LogService {
34            inner,
35            target,
36        }
37    }
38}
39
40impl<S, RequestBody, ResponseBody> Service for LogService<S>
41where S: Service<Request = http::Request<RequestBody>,
42                Response = http::Response<ResponseBody>>,
43      S::Error: ::std::error::Error,
44{
45    type Request = S::Request;
46    type Response = S::Response;
47    type Error = S::Error;
48    type Future = ResponseFuture<S::Future>;
49
50    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
51        self.inner.poll_ready()
52    }
53
54    fn call(&mut self, request: Self::Request) -> Self::Future {
55        let context = if log_enabled!(target: self.target, Level::Info) {
56            Some(LogContext {
57                method: request.method().clone(),
58                path: request.uri().path_and_query().map(|p| p.clone()),
59                version: request.version(),
60                start: Instant::now(),
61                target: self.target,
62            })
63        } else {
64            None
65        };
66
67        let inner = self.inner.call(request);
68
69        ResponseFuture {
70            inner,
71            context,
72        }
73    }
74}
75
76impl<T, B> Future for ResponseFuture<T>
77where
78    T: Future<Item = http::Response<B>>,
79    T::Error: ::std::error::Error,
80{
81    type Item = T::Item;
82    type Error = T::Error;
83
84    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
85        use futures::Async::*;
86
87        let res = self.inner.poll();
88
89        match (&res, &self.context) {
90            (Ok(Ready(ref response)), Some(ref context)) => {
91                let full_path = context.path.as_ref()
92                    .map(|p| p.as_str())
93                    .unwrap_or("/");
94
95                // TODO:
96                // - remote_addr
97                // - response content length
98                // - date
99                let status_code = response.status().as_u16();
100                let level = match status_code {
101                    400...599 => Level::Error,
102                    _ => Level::Info,
103                };
104                logger().log(&Record::builder()
105                    .args(format_args!(
106                        "\"{} {} {:?}\" {} {:?}",
107                        context.method,
108                        full_path,
109                        context.version,
110                        status_code,
111                        context.start.elapsed(),
112                    ))
113                    .level(level)
114                    .target(context.target)
115                    .module_path(Some(module_path!()))
116                    .file(Some(file!()))
117                    .line(Some(line!()))
118                    .build());
119            }
120            (Err(ref err), ..) => {
121                warn!("ERROR: {}", err);
122            }
123            _ => {}
124        }
125
126        res
127    }
128}
tower_web/middleware/log/service.rs

tower_web/middleware/log/
service.rs
