154 lines
4.0 KiB
JavaScript
154 lines
4.0 KiB
JavaScript
var protocol = require('dnode-protocol');
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var Stream = require('stream');
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var json = typeof JSON === 'object' ? JSON : require('jsonify');
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module.exports = dnode;
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dnode.prototype = {};
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(function () { // browsers etc
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for (var key in Stream.prototype) {
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dnode.prototype[key] = Stream.prototype[key];
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}
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})();
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function dnode (cons, opts) {
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Stream.call(this);
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var self = this;
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self.opts = opts || {};
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self.cons = typeof cons === 'function'
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? cons
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: function () { return cons || {} }
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;
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self.readable = true;
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self.writable = true;
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process.nextTick(function () {
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if (self._ended) return;
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self.proto = self._createProto();
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self.proto.start();
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if (!self._handleQueue) return;
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for (var i = 0; i < self._handleQueue.length; i++) {
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self.handle(self._handleQueue[i]);
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}
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});
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}
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dnode.prototype._createProto = function () {
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var self = this;
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var proto = protocol(function (remote) {
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if (self._ended) return;
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var ref = self.cons.call(this, remote, self);
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if (typeof ref !== 'object') ref = this;
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self.emit('local', ref, self);
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return ref;
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}, self.opts.proto);
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proto.on('remote', function (remote) {
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self.emit('remote', remote, self);
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self.emit('ready'); // backwards compatability, deprecated
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});
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proto.on('request', function (req) {
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if (!self.readable) return;
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if (self.opts.emit === 'object') {
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self.emit('data', req);
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}
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else self.emit('data', json.stringify(req) + '\n');
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});
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proto.on('fail', function (err) {
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// errors that the remote end was responsible for
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self.emit('fail', err);
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});
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proto.on('error', function (err) {
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// errors that the local code was responsible for
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self.emit('error', err);
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});
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return proto;
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};
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dnode.prototype.write = function (buf) {
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if (this._ended) return;
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var self = this;
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var row;
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if (buf && typeof buf === 'object'
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&& buf.constructor && buf.constructor.name === 'Buffer'
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&& buf.length
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&& typeof buf.slice === 'function') {
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// treat like a buffer
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if (!self._bufs) self._bufs = [];
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// treat like a buffer
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for (var i = 0, j = 0; i < buf.length; i++) {
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if (buf[i] === 0x0a) {
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self._bufs.push(buf.slice(j, i));
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var line = '';
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for (var k = 0; k < self._bufs.length; k++) {
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line += String(self._bufs[k]);
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}
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try { row = json.parse(line) }
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catch (err) { return self.end() }
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j = i + 1;
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self.handle(row);
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self._bufs = [];
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}
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}
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if (j < buf.length) self._bufs.push(buf.slice(j, buf.length));
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}
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else if (buf && typeof buf === 'object') {
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// .isBuffer() without the Buffer
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// Use self to pipe JSONStream.parse() streams.
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self.handle(buf);
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}
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else {
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if (typeof buf !== 'string') buf = String(buf);
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if (!self._line) self._line = '';
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for (var i = 0; i < buf.length; i++) {
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if (buf.charCodeAt(i) === 0x0a) {
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try { row = json.parse(self._line) }
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catch (err) { return self.end() }
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self._line = '';
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self.handle(row);
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}
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else self._line += buf.charAt(i)
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}
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}
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};
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dnode.prototype.handle = function (row) {
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if (!this.proto) {
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if (!this._handleQueue) this._handleQueue = [];
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this._handleQueue.push(row);
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}
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else this.proto.handle(row);
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};
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dnode.prototype.end = function () {
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if (this._ended) return;
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this._ended = true;
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this.writable = false;
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this.readable = false;
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this.emit('end');
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};
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dnode.prototype.destroy = function () {
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this.end();
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};
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