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use futures::{Future, Poll};
use http;
use log::{logger, Level, Record};
use tower_service::Service;
use std::time::Instant;
#[derive(Debug)]
pub struct LogService<S> {
inner: S,
target: &'static str,
}
#[derive(Debug)]
pub struct ResponseFuture<T> {
inner: T,
context: Option<LogContext>,
}
#[derive(Debug)]
struct LogContext {
method: http::Method,
path: Option<http::uri::PathAndQuery>,
version: http::Version,
start: Instant,
target: &'static str,
}
impl<S> LogService<S> {
pub(super) fn new(inner: S, target: &'static str) -> LogService<S> {
LogService {
inner,
target,
}
}
}
impl<S, RequestBody, ResponseBody> Service for LogService<S>
where S: Service<Request = http::Request<RequestBody>,
Response = http::Response<ResponseBody>>,
S::Error: ::std::error::Error,
{
type Request = S::Request;
type Response = S::Response;
type Error = S::Error;
type Future = ResponseFuture<S::Future>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
self.inner.poll_ready()
}
fn call(&mut self, request: Self::Request) -> Self::Future {
let context = if log_enabled!(target: self.target, Level::Info) {
Some(LogContext {
method: request.method().clone(),
path: request.uri().path_and_query().map(|p| p.clone()),
version: request.version(),
start: Instant::now(),
target: self.target,
})
} else {
None
};
let inner = self.inner.call(request);
ResponseFuture {
inner,
context,
}
}
}
impl<T, B> Future for ResponseFuture<T>
where
T: Future<Item = http::Response<B>>,
T::Error: ::std::error::Error,
{
type Item = T::Item;
type Error = T::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
use futures::Async::*;
let res = self.inner.poll();
match (&res, &self.context) {
(Ok(Ready(ref response)), Some(ref context)) => {
let full_path = context.path.as_ref()
.map(|p| p.as_str())
.unwrap_or("/");
let status_code = response.status().as_u16();
let level = match status_code {
400...599 => Level::Error,
_ => Level::Info,
};
logger().log(&Record::builder()
.args(format_args!(
"\"{} {} {:?}\" {} {:?}",
context.method,
full_path,
context.version,
status_code,
context.start.elapsed(),
))
.level(level)
.target(context.target)
.module_path(Some(module_path!()))
.file(Some(file!()))
.line(Some(line!()))
.build());
}
(Err(ref err), ..) => {
warn!("ERROR: {}", err);
}
_ => {}
}
res
}
}