Hello.
I'm new in nodejs and now playing with streams.
Now I try combine streams in one and then separate their.
For separate used Transform stream.
When i try call "done" callback in _read method of separate Readable
stream - throw Exception.
Error: no writecb in Transform class
at afterTransform (_stream_transform.js:92:33)
at TransformState.afterTransform (_stream_transform.js:76:12)
Thanks for help.
function separateStreams(options) {
var idx = 0;
var streams = [];
function Divider(options) {
Transform.call(this, options);
}
Divider.prototype = Object.create(
Transform.prototype, { constructor: { value: Divider }});
Divider.prototype._transform = function(chunk, encoding, done) {
var length = chunk.length,
split = -1,
buf;
for (var i = 0; i < length; i++) {
if (chunk[i] === 10) { // '\n'
if ((i + 3) < length &&
chunk[i+1] === 10 &&
chunk[i+2] == '93' &&
chunk[i+3] == '93') {
split = i;
break;
}
}
}
var self = this,
rs;
if (!streams[idx]) {
rs = new Readable;
rs._read = function() {
done(); //Error: no writecb in Transform class
};
this.emit('stream', rs, idx);
streams.push(rs);
} else {
rs = streams[idx];
}
if (chunk === null)
return rs.push(null);
if (split == -1) {
rs.push(chunk);
} else {
rs.push(chunk.slice(0, split));
rs.push(null);
idx++;
this.unshift(chunk.slice(split + 4));
}
};
return new Divider(options);
}
rs.pipe(separateStreams).on('stream', function(stream) {
ws.pipe(stream);
});
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