100 lines
2.7 KiB
JavaScript
100 lines
2.7 KiB
JavaScript
'use strict';
|
|
const common = require('../common');
|
|
const assert = require('assert');
|
|
const Readable = require('stream').Readable;
|
|
|
|
const readable = new Readable({
|
|
read: () => {}
|
|
});
|
|
|
|
// Initialized to false.
|
|
assert.strictEqual(readable._readableState.needReadable, false);
|
|
|
|
readable.on('readable', common.mustCall(() => {
|
|
// When the readable event fires, needReadable is reset.
|
|
assert.strictEqual(readable._readableState.needReadable, false);
|
|
readable.read();
|
|
}));
|
|
|
|
// If a readable listener is attached, then a readable event is needed.
|
|
assert.strictEqual(readable._readableState.needReadable, true);
|
|
|
|
readable.push('foo');
|
|
readable.push(null);
|
|
|
|
readable.on('end', common.mustCall(() => {
|
|
// No need to emit readable anymore when the stream ends.
|
|
assert.strictEqual(readable._readableState.needReadable, false);
|
|
}));
|
|
|
|
const asyncReadable = new Readable({
|
|
read: () => {}
|
|
});
|
|
|
|
asyncReadable.on('readable', common.mustCall(() => {
|
|
if (asyncReadable.read() !== null) {
|
|
// After each read(), the buffer is empty.
|
|
// If the stream doesn't end now,
|
|
// then we need to notify the reader on future changes.
|
|
assert.strictEqual(asyncReadable._readableState.needReadable, true);
|
|
}
|
|
}, 2));
|
|
|
|
process.nextTick(common.mustCall(() => {
|
|
asyncReadable.push('foooo');
|
|
}));
|
|
process.nextTick(common.mustCall(() => {
|
|
asyncReadable.push('bar');
|
|
}));
|
|
setImmediate(common.mustCall(() => {
|
|
asyncReadable.push(null);
|
|
assert.strictEqual(asyncReadable._readableState.needReadable, false);
|
|
}));
|
|
|
|
const flowing = new Readable({
|
|
read: () => {}
|
|
});
|
|
|
|
// Notice this must be above the on('data') call.
|
|
flowing.push('foooo');
|
|
flowing.push('bar');
|
|
flowing.push('quo');
|
|
process.nextTick(common.mustCall(() => {
|
|
flowing.push(null);
|
|
}));
|
|
|
|
// When the buffer already has enough data, and the stream is
|
|
// in flowing mode, there is no need for the readable event.
|
|
flowing.on('data', common.mustCall(function(data) {
|
|
assert.strictEqual(flowing._readableState.needReadable, false);
|
|
}, 3));
|
|
|
|
const slowProducer = new Readable({
|
|
read: () => {}
|
|
});
|
|
|
|
slowProducer.on('readable', common.mustCall(() => {
|
|
const chunk = slowProducer.read(8);
|
|
const state = slowProducer._readableState;
|
|
if (chunk === null) {
|
|
// The buffer doesn't have enough data, and the stream is not need,
|
|
// we need to notify the reader when data arrives.
|
|
assert.strictEqual(state.needReadable, true);
|
|
} else {
|
|
assert.strictEqual(state.needReadable, false);
|
|
}
|
|
}, 4));
|
|
|
|
process.nextTick(common.mustCall(() => {
|
|
slowProducer.push('foo');
|
|
process.nextTick(common.mustCall(() => {
|
|
slowProducer.push('foo');
|
|
process.nextTick(common.mustCall(() => {
|
|
slowProducer.push('foo');
|
|
process.nextTick(common.mustCall(() => {
|
|
slowProducer.push(null);
|
|
}));
|
|
}));
|
|
}));
|
|
}));
|