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client.js
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client.js
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var debug = require('debug')('pipe-channels:client');
var MuxDemux = require('mux-demux');
var timers = require('timers');
module.exports = createClient;
function createClient() {
var waitingChannels = {};
var stream = MuxDemux();
stream.channel = channel;
stream.on('connection', onConnection);
return stream;
function channel(payload, cb) {
debug('requesting channel, payload = %j', payload);
var negotiationChannel = stream.createStream();
negotiationChannel.once('data', onNegotiationReply);
negotiationChannel.write(payload);
function onNegotiationReply(reply) {
debug('got negotiation reply: %j', reply);
var err = reply[0];
var id = reply[1];
if (err) {
cb(err);
} else {
waitForChannel(id, cb);
}
}
}
function onConnection(conn) {
debug('got connection %j', conn.meta);
var cb = waitingChannels[conn.meta];
if (cb) {
debug('have callback for channel %j', conn.meta);
delete waitingChannels[conn.meta];
timers.setImmediate(cb, null, conn);
}
}
function waitForChannel(id, cb) {
debug('waiting for channel %j', id);
waitingChannels[id] = cb;
}
}