08-27-周三_17-09-29

node_modules/dnode/lib/dnode.js

@@ -0,0 +1,153 @@
+var protocol = require('dnode-protocol');
+var Stream = require('stream');
+var json = typeof JSON === 'object' ? JSON : require('jsonify');
+
+module.exports = dnode;
+dnode.prototype = {};
+(function () { // browsers etc
+    for (var key in Stream.prototype) {
+        dnode.prototype[key] = Stream.prototype[key];
+    }
+})();
+
+function dnode (cons, opts) {
+    Stream.call(this);
+    var self = this;
+    
+    self.opts = opts || {};
+    
+    self.cons = typeof cons === 'function'
+        ? cons
+        : function () { return cons || {} }
+    ;
+    
+    self.readable = true;
+    self.writable = true;
+    
+    process.nextTick(function () {
+        if (self._ended) return;
+        self.proto = self._createProto();
+        self.proto.start();
+        
+        if (!self._handleQueue) return;
+        for (var i = 0; i < self._handleQueue.length; i++) {
+            self.handle(self._handleQueue[i]);
+        }
+    });
+}
+
+dnode.prototype._createProto = function () {
+    var self = this;
+    var proto = protocol(function (remote) {
+        if (self._ended) return;
+        
+        var ref = self.cons.call(this, remote, self);
+        if (typeof ref !== 'object') ref = this;
+        
+        self.emit('local', ref, self);
+        
+        return ref;
+    }, self.opts.proto);
+    
+    proto.on('remote', function (remote) {
+        self.emit('remote', remote, self);
+        self.emit('ready'); // backwards compatability, deprecated
+    });
+    
+    proto.on('request', function (req) {
+        if (!self.readable) return;
+        
+        if (self.opts.emit === 'object') {
+            self.emit('data', req);
+        }
+        else self.emit('data', json.stringify(req) + '\n');
+    });
+    
+    proto.on('fail', function (err) {
+        // errors that the remote end was responsible for
+        self.emit('fail', err);
+    });
+    
+    proto.on('error', function (err) {
+        // errors that the local code was responsible for
+        self.emit('error', err);
+    });
+    
+    return proto;
+};
+
+dnode.prototype.write = function (buf) {
+    if (this._ended) return;
+    var self = this;
+    var row;
+    
+    if (buf && typeof buf === 'object'
+    && buf.constructor && buf.constructor.name === 'Buffer'
+    && buf.length
+    && typeof buf.slice === 'function') {
+        // treat like a buffer
+        if (!self._bufs) self._bufs = [];
+        
+        // treat like a buffer
+        for (var i = 0, j = 0; i < buf.length; i++) {
+            if (buf[i] === 0x0a) {
+                self._bufs.push(buf.slice(j, i));
+                
+                var line = '';
+                for (var k = 0; k < self._bufs.length; k++) {
+                    line += String(self._bufs[k]);
+                }
+                
+                try { row = json.parse(line) }
+                catch (err) { return self.end() }
+                
+                j = i + 1;
+                
+                self.handle(row);
+                self._bufs = [];
+            }
+        }
+        
+        if (j < buf.length) self._bufs.push(buf.slice(j, buf.length));
+    }
+    else if (buf && typeof buf === 'object') {
+        // .isBuffer() without the Buffer
+        // Use self to pipe JSONStream.parse() streams.
+        self.handle(buf);
+    }
+    else {
+        if (typeof buf !== 'string') buf = String(buf);
+        if (!self._line) self._line = '';
+        
+        for (var i = 0; i < buf.length; i++) {
+            if (buf.charCodeAt(i) === 0x0a) {
+                try { row = json.parse(self._line) }
+                catch (err) { return self.end() }
+                
+                self._line = '';
+                self.handle(row);
+            }
+            else self._line += buf.charAt(i)
+        }
+    }
+};
+
+dnode.prototype.handle = function (row) {
+    if (!this.proto) {
+        if (!this._handleQueue) this._handleQueue = [];
+        this._handleQueue.push(row);
+    }
+    else this.proto.handle(row);
+};
+
+dnode.prototype.end = function () {
+    if (this._ended) return;
+    this._ended = true;
+    this.writable = false;
+    this.readable = false;
+    this.emit('end');
+};
+
+dnode.prototype.destroy = function () {
+    this.end();
+};