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<a href="../../../index.html">all files</a> / <a href="index.html">blackbird/modules/utils/</a> AbortablePromise.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">const Promise = require("bluebird");
const R = require("ramda");
function makeAbortable(promise, abort) {
promise.abort = abort;
// Hijack promise.then so it returns an abortable promise.
const _then = promise.then;
promise.then = function (...args) {
return makeAbortable(Reflect.apply(_then, promise, args), abort);
};
return promise;
}
/**
* A Promise class with an abort() method that calls the onAbort function
* provided by the resolver.
*
* Example:
*
* let promise = new AbortablePromise(function (resolve, reject, onAbort) {
* // Use resolve & reject as you normally would.
* let request = makeRequest( ... , function (error, response) {
* if (error) {
* reject(error);
* } else {
* resolve(response);
* }
* });
*
* // Use onAbort to register a promise.abort() function. It is the
* // responsibility of this function to abort the execution of the
* // promise and resolve/reject as needed.
* onAbort(function () {
* request.abort();
* reject(new Error('Request was aborted'));
* });
* });
*
* promise.abort(); // Calls the onAbort handler.
*/
function AbortablePromise(resolver) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!R.is(Function, resolver)) {
<span class="cstat-no" title="statement not covered" > throw new Error("AbortablePromise needs a resolver function");</span>
}
let abort;
const promise = new Promise(function (resolve, reject) {
let aborter;
abort = <span class="fstat-no" title="function not covered" >function (...args) {</span>
<span class="cstat-no" title="statement not covered" > if (R.isNil(aborter)) {</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
<span class="cstat-no" title="statement not covered" > const fn = aborter;</span>
<span class="cstat-no" title="statement not covered" > aborter = null;</span>
<span class="cstat-no" title="statement not covered" > try {</span>
<span class="cstat-no" title="statement not covered" > return Reflect.apply(fn, this, args);</span>
} catch (error) {
<span class="cstat-no" title="statement not covered" > reject(error);</span>
}
};
resolver(function (...args) {
const [child] = args;
<span class="missing-if-branch" title="if path not taken" >I</span>if (child && R.is(Function, child.abort)) {
<span class="cstat-no" title="statement not covered" > aborter = child.abort;</span>
} else {
aborter = null;
}
Reflect.apply(resolve, this, args);
}, <span class="fstat-no" title="function not covered" >function (...args) {</span>
<span class="cstat-no" title="statement not covered" > aborter = null;</span>
<span class="cstat-no" title="statement not covered" > Reflect.apply(reject, this, args);</span>
}, function (fn) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!R.is(Function, fn)) {
<span class="cstat-no" title="statement not covered" > throw new Error("onAbort needs a function");</span>
}
aborter = fn;
});
});
return makeAbortable(promise, abort);
}
module.exports = AbortablePromise;
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