mirror of
https://github.com/denoland/deno.git
synced 2024-12-14 19:37:59 -05:00
82 lines
2.5 KiB
JavaScript
82 lines
2.5 KiB
JavaScript
// deno-fmt-ignore-file
|
|
// deno-lint-ignore-file
|
|
|
|
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
|
|
// Taken from Node 18.12.1
|
|
// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
|
|
|
|
'use strict';
|
|
const common = require('../common');
|
|
const stream = require('stream');
|
|
const assert = require('assert');
|
|
|
|
// A consumer stream with a very low highWaterMark, which starts in a state
|
|
// where it buffers the chunk it receives rather than indicating that they
|
|
// have been consumed.
|
|
const writable = new stream.Writable({
|
|
highWaterMark: 5
|
|
});
|
|
|
|
let isCurrentlyBufferingWrites = true;
|
|
const queue = [];
|
|
|
|
writable._write = (chunk, encoding, cb) => {
|
|
if (isCurrentlyBufferingWrites)
|
|
queue.push({ chunk, cb });
|
|
else
|
|
cb();
|
|
};
|
|
|
|
const readable = new stream.Readable({
|
|
read() {}
|
|
});
|
|
|
|
readable.pipe(writable);
|
|
|
|
readable.once('pause', common.mustCall(() => {
|
|
assert.strictEqual(
|
|
readable._readableState.awaitDrainWriters,
|
|
writable,
|
|
'Expected awaitDrainWriters to be a Writable but instead got ' +
|
|
`${readable._readableState.awaitDrainWriters}`
|
|
);
|
|
// First pause, resume manually. The next write() to writable will still
|
|
// return false, because chunks are still being buffered, so it will increase
|
|
// the awaitDrain counter again.
|
|
|
|
process.nextTick(common.mustCall(() => {
|
|
readable.resume();
|
|
}));
|
|
|
|
readable.once('pause', common.mustCall(() => {
|
|
assert.strictEqual(
|
|
readable._readableState.awaitDrainWriters,
|
|
writable,
|
|
'.resume() should not reset the awaitDrainWriters, but instead got ' +
|
|
`${readable._readableState.awaitDrainWriters}`
|
|
);
|
|
// Second pause, handle all chunks from now on. Once all callbacks that
|
|
// are currently queued up are handled, the awaitDrain drain counter should
|
|
// fall back to 0 and all chunks that are pending on the readable side
|
|
// should be flushed.
|
|
isCurrentlyBufferingWrites = false;
|
|
for (const queued of queue)
|
|
queued.cb();
|
|
}));
|
|
}));
|
|
|
|
readable.push(Buffer.alloc(100)); // Fill the writable HWM, first 'pause'.
|
|
readable.push(Buffer.alloc(100)); // Second 'pause'.
|
|
readable.push(Buffer.alloc(100)); // Should get through to the writable.
|
|
readable.push(null);
|
|
|
|
writable.on('finish', common.mustCall(() => {
|
|
assert.strictEqual(
|
|
readable._readableState.awaitDrainWriters,
|
|
null,
|
|
`awaitDrainWriters should be reset to null
|
|
after all chunks are written but instead got
|
|
${readable._readableState.awaitDrainWriters}`
|
|
);
|
|
// Everything okay, all chunks were written.
|
|
}));
|