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import { SchedulerLike } from '../types';
import { isScheduler } from '../util/isScheduler';
import { Observable } from '../Observable';
import { subscribeOn } from '../operators/subscribeOn';
import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
import { observeOn } from '../operators/observeOn';
import { AsyncSubject } from '../AsyncSubject';
export function bindCallbackInternals(
isNodeStyle: boolean,
callbackFunc: any,
resultSelector?: any,
scheduler?: SchedulerLike
): (...args: any[]) => Observable<unknown> {
if (resultSelector) {
if (isScheduler(resultSelector)) {
scheduler = resultSelector;
} else {
// The user provided a result selector.
return function (this: any, ...args: any[]) {
return (bindCallbackInternals(isNodeStyle, callbackFunc, scheduler) as any)
.apply(this, args)
.pipe(mapOneOrManyArgs(resultSelector as any));
};
}
}
// If a scheduler was passed, use our `subscribeOn` and `observeOn` operators
// to compose that behavior for the user.
if (scheduler) {
return function (this: any, ...args: any[]) {
return (bindCallbackInternals(isNodeStyle, callbackFunc) as any)
.apply(this, args)
.pipe(subscribeOn(scheduler!), observeOn(scheduler!));
};
}
return function (this: any, ...args: any[]): Observable<any> {
// We're using AsyncSubject, because it emits when it completes,
// and it will play the value to all late-arriving subscribers.
const subject = new AsyncSubject<any>();
// If this is true, then we haven't called our function yet.
let uninitialized = true;
return new Observable((subscriber) => {
// Add our subscriber to the subject.
const subs = subject.subscribe(subscriber);
if (uninitialized) {
uninitialized = false;
// We're going to execute the bound function
// This bit is to signal that we are hitting the callback asynchronously.
// Because we don't have any anti-"Zalgo" guarantees with whatever
// function we are handed, we use this bit to figure out whether or not
// we are getting hit in a callback synchronously during our call.
let isAsync = false;
// This is used to signal that the callback completed synchronously.
let isComplete = false;
// Call our function that has a callback. If at any time during this
// call, an error is thrown, it will be caught by the Observable
// subscription process and sent to the consumer.
callbackFunc.apply(
// Pass the appropriate `this` context.
this,
[
// Pass the arguments.
...args,
// And our callback handler.
(...results: any[]) => {
if (isNodeStyle) {
// If this is a node callback, shift the first value off of the
// results and check it, as it is the error argument. By shifting,
// we leave only the argument(s) we want to pass to the consumer.
const err = results.shift();
if (err != null) {
subject.error(err);
// If we've errored, we can stop processing this function
// as there's nothing else to do. Just return to escape.
return;
}
}
// If we have one argument, notify the consumer
// of it as a single value, otherwise, if there's more than one, pass
// them as an array. Note that if there are no arguments, `undefined`
// will be emitted.
subject.next(1 < results.length ? results : results[0]);
// Flip this flag, so we know we can complete it in the synchronous
// case below.
isComplete = true;
// If we're not asynchronous, we need to defer the `complete` call
// until after the call to the function is over. This is because an
// error could be thrown in the function after it calls our callback,
// and if that is the case, if we complete here, we are unable to notify
// the consumer than an error occurred.
if (isAsync) {
subject.complete();
}
},
]
);
// If we flipped `isComplete` during the call, we resolved synchronously,
// notify complete, because we skipped it in the callback to wait
// to make sure there were no errors during the call.
if (isComplete) {
subject.complete();
}
// We're no longer synchronous. If the callback is called at this point
// we can notify complete on the spot.
isAsync = true;
}
// Return the subscription from adding our subscriber to the subject.
return subs;
});
};
}