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'use strict';
const common = require('../common');
const assert = require('assert');
const Readable = require('stream').Readable;
{
const readable = new Readable({
read(size) {}
});
const state = readable._readableState;
// Starting off with false initially.
assert.strictEqual(state.reading, false);
assert.strictEqual(state.readingMore, false);
readable.on('data', common.mustCall((data) => {
// While in a flowing state with a 'readable' listener
// we should not be reading more
if (readable.readableFlowing)
assert.strictEqual(state.readingMore, true);
// Reading as long as we've not ended
assert.strictEqual(state.reading, !state.ended);
}, 2));
function onStreamEnd() {
// End of stream; state.reading is false
// And so should be readingMore.
assert.strictEqual(state.readingMore, false);
assert.strictEqual(state.reading, false);
}
const expectedReadingMore = [true, true, false];
readable.on('readable', common.mustCall(() => {
// There is only one readingMore scheduled from on('data'),
// after which everything is governed by the .read() call
assert.strictEqual(state.readingMore, expectedReadingMore.shift());
// If the stream has ended, we shouldn't be reading
assert.strictEqual(state.ended, !state.reading);
// Consume all the data
while (readable.read() !== null) {}
if (expectedReadingMore.length === 0) // Reached end of stream
process.nextTick(common.mustCall(onStreamEnd, 1));
}, 3));
readable.on('end', common.mustCall(onStreamEnd));
readable.push('pushed');
readable.read(6);
// reading
assert.strictEqual(state.reading, true);
assert.strictEqual(state.readingMore, true);
// add chunk to front
readable.unshift('unshifted');
// end
readable.push(null);
}
{
const readable = new Readable({
read(size) {}
});
const state = readable._readableState;
// Starting off with false initially.
assert.strictEqual(state.reading, false);
assert.strictEqual(state.readingMore, false);
readable.on('data', common.mustCall((data) => {
// While in a flowing state without a 'readable' listener
// we should be reading more
if (readable.readableFlowing)
assert.strictEqual(state.readingMore, true);
// Reading as long as we've not ended
assert.strictEqual(state.reading, !state.ended);
}, 2));
function onStreamEnd() {
// End of stream; state.reading is false
// And so should be readingMore.
assert.strictEqual(state.readingMore, false);
assert.strictEqual(state.reading, false);
}
readable.on('end', common.mustCall(onStreamEnd));
readable.push('pushed');
// Stop emitting 'data' events
assert.strictEqual(state.flowing, true);
readable.pause();
// paused
assert.strictEqual(state.reading, false);
assert.strictEqual(state.flowing, false);
readable.resume();
assert.strictEqual(state.reading, false);
assert.strictEqual(state.flowing, true);
// add chunk to front
readable.unshift('unshifted');
// end
readable.push(null);
}
{
const readable = new Readable({
read(size) {}
});
const state = readable._readableState;
// Starting off with false initially.
assert.strictEqual(state.reading, false);
assert.strictEqual(state.readingMore, false);
const onReadable = common.mustNotCall;
readable.on('readable', onReadable);
readable.on('data', common.mustCall((data) => {
// Reading as long as we've not ended
assert.strictEqual(state.reading, !state.ended);
}, 2));
readable.removeListener('readable', onReadable);
function onStreamEnd() {
// End of stream; state.reading is false
// And so should be readingMore.
assert.strictEqual(state.readingMore, false);
assert.strictEqual(state.reading, false);
}
readable.on('end', common.mustCall(onStreamEnd));
readable.push('pushed');
// We are still not flowing, we will be resuming in the next tick
assert.strictEqual(state.flowing, false);
// Wait for nextTick, so the readableListener flag resets
process.nextTick(function() {
readable.resume();
// Stop emitting 'data' events
assert.strictEqual(state.flowing, true);
readable.pause();
// paused
assert.strictEqual(state.flowing, false);
readable.resume();
assert.strictEqual(state.flowing, true);
// add chunk to front
readable.unshift('unshifted');
// end
readable.push(null);
});
}
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