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体验新版 GitCode,发现更多精彩内容 >>
未验证
提交
5bf1e4de
编写于
4月 10, 2020
作者:
C
Chris Knight
提交者:
GitHub
4月 10, 2020
浏览文件
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浏览文件
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电子邮件补丁
差异文件
feat(std/signal): add utility for listening to signal events (#4696)
上级
02bc58d8
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
80 addition
and
2 deletion
+80
-2
std/signal/mod.ts
std/signal/mod.ts
+45
-1
std/signal/test.ts
std/signal/test.ts
+35
-1
未找到文件。
std/signal/mod.ts
浏览文件 @
5bf1e4de
import
{
MuxAsyncIterator
}
from
"
../util/async.ts
"
;
export
type
Disposable
=
{
dispose
:
()
=>
void
};
/**
* Generates an AsyncIterable which can be awaited on for one or more signals.
* `dispose()` can be called when you are finished waiting on the events.
*
* Example:
*
* const sig = signal(Deno.Signal.SIGUSR1, Deno.Signal.SIGINT);
* setTimeout(() => {}, 5000); // Prevents exiting immediately
*
* for await (const _ of sig) {
* console.log("interrupt or usr1 signal received");
* }
*
* // At some other point in your code when finished listening:
* sig.dispose();
*
* @param signos - one or more `Deno.Signal`s to await on
*/
export
function
signal
(
...
signos
:
[
number
,
...
number
[]]
):
AsyncIterable
<
void
>
&
{
dispose
:
()
=>
void
}
{
):
AsyncIterable
<
void
>
&
Disposable
{
const
mux
=
new
MuxAsyncIterator
<
void
>
();
if
(
signos
.
length
<
1
)
{
...
...
@@ -26,3 +46,27 @@ export function signal(
return
Object
.
assign
(
mux
,
{
dispose
});
}
/**
* Registers a callback function to be called on triggering of a signal event.
*
* const handle = onSignal(Deno.Signal.SIGINT, () => {
* console.log('Received SIGINT');
* handle.dispose(); // de-register from receiving further events
* });
*
* @param signo One of Deno.Signal (e.g. Deno.Signal.SIGINT)
* @param callback Callback function triggered upon signal event
*/
export
function
onSignal
(
signo
:
number
,
callback
:
()
=>
void
):
Disposable
{
const
sig
=
signal
(
signo
);
//setTimeout allows `sig` to be returned before blocking on the await
setTimeout
(
async
()
=>
{
for
await
(
const
_
of
sig
)
{
callback
();
}
},
0
);
return
sig
;
}
std/signal/test.ts
浏览文件 @
5bf1e4de
const
{
test
}
=
Deno
;
import
{
assertEquals
,
assertThrows
}
from
"
../testing/asserts.ts
"
;
import
{
delay
}
from
"
../util/async.ts
"
;
import
{
signal
}
from
"
./mod.ts
"
;
import
{
signal
,
onSignal
}
from
"
./mod.ts
"
;
if
(
Deno
.
build
.
os
!==
"
win
"
)
{
test
(
"
signal() throws when called with empty signals
"
,
():
void
=>
{
...
...
@@ -58,4 +58,38 @@ if (Deno.build.os !== "win") {
await
delay
(
10
);
},
});
test
({
name
:
"
onSignal() registers and disposes of event handler
"
,
async
fn
()
{
// This prevents the program from exiting.
const
t
=
setInterval
(()
=>
{},
1000
);
let
calledCount
=
0
;
const
handle
=
onSignal
(
Deno
.
Signal
.
SIGINT
,
()
=>
{
calledCount
++
;
});
await
delay
(
20
);
Deno
.
kill
(
Deno
.
pid
,
Deno
.
Signal
.
SIGINT
);
await
delay
(
20
);
Deno
.
kill
(
Deno
.
pid
,
Deno
.
Signal
.
SIGINT
);
await
delay
(
20
);
Deno
.
kill
(
Deno
.
pid
,
Deno
.
Signal
.
SIGUSR2
);
await
delay
(
20
);
handle
.
dispose
();
// stop monitoring SIGINT
await
delay
(
20
);
Deno
.
kill
(
Deno
.
pid
,
Deno
.
Signal
.
SIGUSR1
);
await
delay
(
20
);
Deno
.
kill
(
Deno
.
pid
,
Deno
.
Signal
.
SIGINT
);
await
delay
(
20
);
assertEquals
(
calledCount
,
2
);
clearTimeout
(
t
);
// Clear timeout clears interval, but interval promise is not
// yet resolved, delay to next turn of event loop otherwise,
// we'll be leaking resources.
await
delay
(
10
);
},
});
}
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