function emitReadable_(stream) { debug('emit readable'); stream.emit('readable'); flow(stream); }
function pipeOnDrain(src) { return function() { var state = src._readableState; debug('pipeOnDrain', state.awaitDrain); if (state.awaitDrain) state.awaitDrain--; if (state.awaitDrain === 0 && EE.listenerCount(src, 'data')) { state.flowing = true; flow(src); } }; }
function resume_(stream, state) { if (!state.reading) { debug('resume read 0'); stream.read(0); } state.resumeScheduled = false; state.awaitDrain = 0; stream.emit('resume'); flow(stream); if (state.flowing && !state.reading) stream.read(0); }
function maybeReadMore_(stream, state) { var len = state.length; while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) { debug('maybeReadMore read 0'); stream.read(0); if (len === state.length) // didn't get any data, stop spinning. break; else len = state.length; } state.readingMore = false; }
// if the dest has an error, then stop piping into it. // however, don't suppress the throwing behavior for this. function onerror(er) { debug('onerror', er); unpipe(); dest.removeListener('error', onerror); if (EE.listenerCount(dest, 'error') === 0) dest.emit('error', er); }
// Don't emit readable right away in sync mode, because this can trigger // another read() call => stack overflow. This way, it might trigger // a nextTick recursion warning, but that's not so bad. function emitReadable(stream) { var state = stream._readableState; state.needReadable = false; if (!state.emittedReadable) { debug('emitReadable', state.flowing); state.emittedReadable = true; if (state.sync) process.nextTick(emitReadable_, stream); else emitReadable_(stream); } }
stream.on('end', function() { debug('wrapped end'); if (state.decoder && !state.ended) { var chunk = state.decoder.end(); if (chunk && chunk.length) self.push(chunk); } self.push(null); });
function ondata(chunk) { debug('ondata'); increasedAwaitDrain = false; var ret = dest.write(chunk); if (false === ret && !increasedAwaitDrain) { // If the user unpiped during `dest.write()`, it is possible // to get stuck in a permanently paused state if that write // also returned false. // => Check whether `dest` is still a piping destination. if (((state.pipesCount === 1 && state.pipes === dest) || (state.pipesCount > 1 && state.pipes.indexOf(dest) !== -1)) && !cleanedUp) { debug('false write response, pause', src._readableState.awaitDrain); src._readableState.awaitDrain++; increasedAwaitDrain = true; } src.pause(); } }
function onunpipe(readable, unpipeInfo) { debug('onunpipe'); if (readable === src) { if (unpipeInfo && unpipeInfo.hasUnpiped === false) { unpipeInfo.hasUnpiped = true; cleanup(); } } }
stream.on('data', function(chunk) { debug('wrapped data'); if (state.decoder) chunk = state.decoder.write(chunk); // don't skip over falsy values in objectMode if (state.objectMode && (chunk === null || chunk === undefined)) return; else if (!state.objectMode && (!chunk || !chunk.length)) return; var ret = self.push(chunk); if (!ret) { paused = true; stream.pause(); } });
function onfinish() { debug('onfinish'); dest.removeListener('close', onclose); unpipe(); }
function flow(stream) { const state = stream._readableState; debug('flow', state.flowing); while (state.flowing && stream.read() !== null); }
function onend() { debug('onend'); dest.end(); }
function nReadingNextTick(self) { debug('readable nexttick read 0'); self.read(0); }
function unpipe() { debug('unpipe'); src.unpipe(dest); }