axios-promise
v0.11.3
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Lightweight Promises/A+ compatible implementation with cancellation, sync mode, timeouts, coroutines and signals support
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Axios Promise
Lightweight Promises/A+ compatible implementation with cancellation, sync mode, timeouts, coroutines and signals support
Installing
Using npm:
$ npm install axios-promise
import {AxiosPromise, AxiosPromiseSync} from 'axios-promise';
Intro
AxiosPromise
is a Promises/A+
compatible implementation with cancellation API extension,
therefore, to start using it, you do not need to additionally learn a new and complex API.
All you need to know that every promise:
- has
.cancel([reason])
method - has
.onCancel
subscriber for optional aborting long-running asynchronous operation inside a promise
Basic Examples
import { AxiosPromise } from 'axios-promise';
const p = new AxiosPromise((resolve, reject, {onCancel}) => {
const timer = setTimeout(resolve, 1000, 123);
onCancel((reason) => {
console.log('clear timer', reason);
clearTimeout(timer);
});
}).then(
v => console.log(`Done: ${v}`),
e => console.warn(`Fail: ${e}`)
);
setTimeout(()=> p.cancel(), 500);
Instead of using the plain onCancel
listener you can subscribe to a AbortSignal
instance for the same purpose.
You can also set onCancel handler by returning it from the promise executor function:
import { AxiosPromise } from 'axios-promise';
const p = new AxiosPromise((resolve) => {
const timer = setTimeout(resolve, 1000, 123);
return (reason) => {
console.log('clear timer', reason);
clearTimeout(timer);
};
}).then(
v => console.log(`Done: ${v}`),
e => console.warn(`Fail: ${e}`)
);
setTimeout(()=> p.cancel(), 500);
See Live Playground (Version for Node)
function cancelableFetch(url) {
return new AxiosPromise((resolve, reject, {signal}) => {
fetch(url, {signal}).then(resolve, reject)
});
}
const p = cancelableFetch('http://httpbin.org/get').then((response) => response.json()).then(console.log);
// p.cancel();
OR
const p = cancelableFetch('http://httpbin.org/get').then(function*(response) {
const json = yield response.json();
console.log(json);
});
OR
const requestJSON = AxiosPromise.promisify(function*({signal}, url) {
const response = yield fetch(url, {signal});
const json = yield response.json();
console.log(json);
}, {scopeArg: true});
const p = requestJSON('http://httpbin.org/get');
// p.cancel();
Features
no dependencies, less than
5KB
gzippedprovides two classes:
AxiosPromise
- Promises/A+ compatible implementationAxiosPromiseSync
- a subclass ofAxiosPromise
but with synchronous chains resolution
recursive cancellation by rejecting the deepest promise in the chain with a special
CanceledError
reasonNote: AxiosPromise passes an additional scope argument to the executor function and
then
handlers, which refers to the promise context.const p = new AxiosPromise((resolve, reject, scope) => { const timer = setTimeout(resolve, 1000); scope.onCancel(() => clearTimeout(timer)); }).then((value, scope) => console.log(value), (reason, scope) => console.warn(reason)); setTimeout(() => p.cancel(), 100);
cancellable delay helper
await AxiosPromise.delay(1000, 'foo');
timeouts - each promise has a
timeout
setterawait AxiosPromise.delay(1000).timeout(100);
subscribing to an external
AbortSignal
const controller = new AbortController(); AxiosPromise.delay(1000).listen(controller.signal).then(console.log, console.warn); setTimeout(() => controller.abort(), 100);
Providing an
AbortSignal
to subscribe - every promise has asignal
getter that you can subscribe toAxiosPromise.delay(1000).timeout(100).signal.addEventListener('abort', () => console.log('canceled'));
atomic chains - makes sub-chain not cancellable when canceled from upper chain
AWAIT = false
mode (default value) - waits for the atomic sub-chain to resolve before canceling the upper chainconst p = AxiosPromise.delay(1000).atomic(false).then(() => AxiosPromise.delay(1000)).then(console.log, console.warn); p.cancel(); // will wait for the first promise and then cancel the rest
DETACHED = true
mode - does not wait for the atomic sub-chain to resolve, but cancels the upper chain.const p = AxiosPromise.delay(1000).atomic(true).then(() => AxiosPromise.delay(1000)).then(console.log, console.warn); p.cancel(); // will keep the first promise pending and cancel the rest of the chain
coroutines - write flat cancelable code as if you were using ECMA asynchronous functions
const myAsyncFunc = AxiosPromise.promisify(function*(str) { const newStr = yield AxiosPromise.delay(1000, 'Hello ') + str; return newStr; }); const p = myAsyncFunc(123).then(function*(value) { yield AxiosPromise.delay(1000); console.log(`It supports generators in then method, result is:`, value); }); //p.cancel();
.all
method will cancel all pending promises if one rejected.race
method will cancel all pending promises if one resolvedfinally
method handles a status entry as the first argument
Error handling
Cancelling chain means rejecting its deepest promise with a CanceledError
reason.
const p = new AxiosPromise((resolve, reject, {onCancel}) => {
const timer = setTimeout(()=> {
Math.random() > 0.5 ? reject(new Error('Oops!')) : resolve('foo');
}, 1000);
onCancel(() => clearTimeout(timer));
}).then((value) => {
return value + 'bar';
}).catch((err) => {
// re-throw the error if this is an instance of CanceledError to handle it with upper chains
CanceledError.rethow(err);
console.log('Error', err)
});
Note: uncaught
CanceledError
rejection won't lead tounhandledrejection
warning
Helpers
bottleneck
A helper that creates a simple queue by decorating an asynchronous function.
bottleneck(fn, options?: {concurrency: number, cancelRunning: boolean, sync: boolean, timeout: number, taskTimeout: number, queueTimeout: number})
const fn = bottleneck(function* () {
console.log('start');
yield AxiosPromise.delay(2000);
console.log('end');
return 'foo'
}, {concurrency: 1});
const results = await Promise.allSettled([
fn(),
fn(),
fn()
]);
console.log(results.map(({status, reason, value}) => status + ' : ' + (reason?.toString() || value)))
Log:
start
end
start
end
start
end
[ 'fulfilled : foo', 'fulfilled : foo', 'fulfilled : foo' ]
Options
cancelRunning
- cancel running tasks if the concurrency limit is reached
const fn = bottleneck(function* () {
console.log('start');
yield AxiosPromise.delay(2000);
console.log('end');
return 'foo'
}, {cancelRunning: true, concurrency: 1});
const results = await Promise.allSettled([
fn(),
fn(),
fn()
]);
console.log(results.map(({status, reason, value}) => status + ' : ' + (reason?.message || value)))
Log:
start
end
[
'rejected : CanceledError: task limit reached',
'rejected : CanceledError: task limit reached',
'fulfilled : foo'
]
timeout/taskTimeout/queueTimeout
- use AxiosPromiseSync instead AxiosPromise
Sets appropriate timeouts
(async () => {
const fn = bottleneck(function* (t = 2000) {
console.log('start');
yield AxiosPromise.delay(t);
console.log('end');
return 'foo'
}, {concurrency: 1, taskTimeout: 1000});
const results = await Promise.allSettled([
fn(),
fn(),
fn(500)
]);
console.log(results.map(({status, reason, value}) => status + ' : ' + (reason?.toString() || value)))
})();
Log:
start
start
start
end
[
'rejected : TimeoutError: task timeout',
'rejected : TimeoutError: task timeout',
'fulfilled : foo'
]
Manual cancellation
const fn = bottleneck(function* (t = 2000) {
console.log('start');
yield AxiosPromise.delay(t);
console.log('end');
return 'foo'
}, {concurrency: 1});
const tasks = [
fn(),
fn(),
fn()
];
setTimeout(() => {
tasks[1].cancel('Oops!');
}, 500);
const results = await Promise.allSettled(tasks);
console.log(results.map(({status, reason, value}) => status + ' : ' + (reason?.toString() || value)))
Log:
start
end
start
end
[
'fulfilled : foo',
'rejected : CanceledError: Oops!',
'fulfilled : foo'
]
License
The MIT License Copyright (c) 2023 Dmitriy Mozgovoy [email protected]
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.