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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import {
Deferred,
getDeferred,
isWritableStream,
isWritableStreamDefaultWriter,
isWritableStreamLocked,
setFunctionName,
setPromiseIsHandledToTrue,
writableStreamCloseQueuedOrInFlight,
writableStreamDefaultWriterAbort,
writableStreamDefaultWriterClose,
writableStreamDefaultWriterGetDesiredSize,
writableStreamDefaultWriterRelease,
writableStreamDefaultWriterWrite,
} from "./internals.ts";
import * as sym from "./symbols.ts";
import { WritableStreamImpl } from "./writable_stream.ts";
import { customInspect } from "../console.ts";
import { assert } from "../../util.ts";
export class WritableStreamDefaultWriterImpl<W>
implements WritableStreamDefaultWriter<W> {
[sym.closedPromise]: Deferred<void>;
[sym.ownerWritableStream]: WritableStreamImpl<W>;
[sym.readyPromise]: Deferred<void>;
constructor(stream: WritableStreamImpl<W>) {
if (!isWritableStream(stream)) {
throw new TypeError("Invalid stream.");
}
if (isWritableStreamLocked(stream)) {
throw new TypeError("Cannot create a writer for a locked stream.");
}
this[sym.ownerWritableStream] = stream;
stream[sym.writer] = this;
const state = stream[sym.state];
if (state === "writable") {
if (
!writableStreamCloseQueuedOrInFlight(stream) &&
stream[sym.backpressure]
) {
this[sym.readyPromise] = getDeferred();
} else {
this[sym.readyPromise] = { promise: Promise.resolve() };
}
this[sym.closedPromise] = getDeferred();
} else if (state === "erroring") {
this[sym.readyPromise] = {
promise: Promise.reject(stream[sym.storedError]),
};
setPromiseIsHandledToTrue(this[sym.readyPromise].promise);
this[sym.closedPromise] = getDeferred();
} else if (state === "closed") {
this[sym.readyPromise] = { promise: Promise.resolve() };
this[sym.closedPromise] = { promise: Promise.resolve() };
} else {
assert(state === "errored");
const storedError = stream[sym.storedError];
this[sym.readyPromise] = { promise: Promise.reject(storedError) };
setPromiseIsHandledToTrue(this[sym.readyPromise].promise);
this[sym.closedPromise] = { promise: Promise.reject(storedError) };
setPromiseIsHandledToTrue(this[sym.closedPromise].promise);
}
}
get closed(): Promise<void> {
if (!isWritableStreamDefaultWriter(this)) {
return Promise.reject(
new TypeError("Invalid WritableStreamDefaultWriter.")
);
}
return this[sym.closedPromise].promise;
}
get desiredSize(): number | null {
if (!isWritableStreamDefaultWriter(this)) {
throw new TypeError("Invalid WritableStreamDefaultWriter.");
}
if (!this[sym.ownerWritableStream]) {
throw new TypeError("WritableStreamDefaultWriter has no owner.");
}
return writableStreamDefaultWriterGetDesiredSize(this);
}
get ready(): Promise<void> {
if (!isWritableStreamDefaultWriter(this)) {
return Promise.reject(
new TypeError("Invalid WritableStreamDefaultWriter.")
);
}
return this[sym.readyPromise].promise;
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
abort(reason: any): Promise<void> {
if (!isWritableStreamDefaultWriter(this)) {
return Promise.reject(
new TypeError("Invalid WritableStreamDefaultWriter.")
);
}
if (!this[sym.ownerWritableStream]) {
Promise.reject(
new TypeError("WritableStreamDefaultWriter has no owner.")
);
}
return writableStreamDefaultWriterAbort(this, reason);
}
close(): Promise<void> {
if (!isWritableStreamDefaultWriter(this)) {
return Promise.reject(
new TypeError("Invalid WritableStreamDefaultWriter.")
);
}
const stream = this[sym.ownerWritableStream];
if (!stream) {
Promise.reject(
new TypeError("WritableStreamDefaultWriter has no owner.")
);
}
if (writableStreamCloseQueuedOrInFlight(stream)) {
Promise.reject(
new TypeError("Stream is in an invalid state to be closed.")
);
}
return writableStreamDefaultWriterClose(this);
}
releaseLock(): void {
if (!isWritableStreamDefaultWriter(this)) {
throw new TypeError("Invalid WritableStreamDefaultWriter.");
}
const stream = this[sym.ownerWritableStream];
if (!stream) {
return;
}
assert(stream[sym.writer]);
writableStreamDefaultWriterRelease(this);
}
write(chunk: W): Promise<void> {
if (!isWritableStreamDefaultWriter(this)) {
return Promise.reject(
new TypeError("Invalid WritableStreamDefaultWriter.")
);
}
if (!this[sym.ownerWritableStream]) {
Promise.reject(
new TypeError("WritableStreamDefaultWriter has no owner.")
);
}
return writableStreamDefaultWriterWrite(this, chunk);
}
[customInspect](): string {
return `${this.constructor.name} { closed: Promise, desiredSize: ${String(
this.desiredSize
)}, ready: Promise }`;
}
}
setFunctionName(WritableStreamDefaultWriterImpl, "WritableStreamDefaultWriter");
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