1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
#![doc(html_root_url = "https://docs.rs/zipkin-futures/0.4")]
#![warn(missing_docs)]
extern crate futures;
extern crate zipkin;
use futures::{Future, Poll, Sink, StartSend, Stream};
use zipkin::{TraceContext, Tracer};
pub struct Spanned<T> {
context: TraceContext,
tracer: Tracer,
inner: T,
}
impl<T> Spanned<T> {
pub fn new(context: TraceContext, tracer: &Tracer, inner: T) -> Spanned<T> {
Spanned {
context,
tracer: tracer.clone(),
inner,
}
}
pub fn context(&self) -> TraceContext {
self.context
}
pub fn tracer(&self) -> &Tracer {
&self.tracer
}
pub fn into_inner(self) -> T {
self.inner
}
}
impl<F> Future for Spanned<F>
where
F: Future,
{
type Item = F::Item;
type Error = F::Error;
fn poll(&mut self) -> Poll<F::Item, F::Error> {
let _guard = self.tracer.set_current(self.context);
self.inner.poll()
}
}
impl<S> Stream for Spanned<S>
where
S: Stream,
{
type Item = S::Item;
type Error = S::Error;
fn poll(&mut self) -> Poll<Option<S::Item>, S::Error> {
let _guard = self.tracer.set_current(self.context);
self.inner.poll()
}
}
impl<S> Sink for Spanned<S>
where
S: Sink,
{
type SinkItem = S::SinkItem;
type SinkError = S::SinkError;
fn start_send(&mut self, item: S::SinkItem) -> StartSend<S::SinkItem, S::SinkError> {
let _guard = self.tracer.set_current(self.context);
self.inner.start_send(item)
}
fn poll_complete(&mut self) -> Poll<(), S::SinkError> {
let _guard = self.tracer.set_current(self.context);
self.inner.poll_complete()
}
fn close(&mut self) -> Poll<(), S::SinkError> {
let _guard = self.tracer.set_current(self.context);
self.inner.close()
}
}