[CCSDK-28] populated the seed code for dgbuilder

[ccsdk/distribution.git] / dgbuilder / red / nodes / Node.js

diff --git a/dgbuilder/red/nodes/Node.js b/dgbuilder/red/nodes/Node.js
new file mode 100644 (file)
index 0000000..0e6fc52
--- /dev/null
+++ b/dgbuilder/red/nodes/Node.js
@@ -0,0 +1,147 @@
+/**
+ * Copyright 2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+var util = require("util");
+var EventEmitter = require("events").EventEmitter;
+var clone = require("clone");
+var when = require("when");
+
+var flows = require("./flows");
+var comms = require("../comms");
+
+function Node(n) {
+    this.id = n.id;
+    flows.add(this);
+    this.type = n.type;
+    if (n.name) {
+        this.name = n.name;
+    }
+    this.wires = n.wires||[];
+}
+
+util.inherits(Node,EventEmitter);
+
+Node.prototype._on = Node.prototype.on;
+
+Node.prototype.on = function(event,callback) {
+    var node = this;
+    if (event == "close") {
+        if (callback.length == 1) {
+            this.close = function() {
+                return when.promise(function(resolve) {
+                    callback.call(node,function() {
+                        resolve();
+                    });
+                });
+            }
+        } else {
+            this.close = callback;
+        }
+    } else {
+        this._on(event,callback);
+    }
+}
+
+Node.prototype.close = function() {
+}
+
+Node.prototype.send = function(msg) {
+    // instanceof doesn't work for some reason here
+    if (msg == null) {
+        return;
+    } else if (!util.isArray(msg)) {
+        msg = [msg];
+    }
+    for (var i=0;i<this.wires.length;i++) {
+        var wires = this.wires[i];
+        if (i < msg.length) {
+            if (msg[i] != null) {
+                var msgs = msg[i];
+                if (!util.isArray(msg[i])) {
+                    msgs = [msg[i]];
+                }
+                //if (wires.length == 1) {
+                //    // Single recipient, don't need to clone the message
+                //    var node = flows.get(wires[0]);
+                //    if (node) {
+                //        for (var k in msgs) {
+                //            var mm = msgs[k];
+                //            node.receive(mm);
+                //        }
+                //    }
+                //} else {
+                    // Multiple recipients, must send message copies
+                    for (var j=0;j<wires.length;j++) {
+                        var node = flows.get(wires[j]);
+                        if (node) {
+                            for (var k=0;k<msgs.length;k++) {
+                                var mm = msgs[k];
+                                // Temporary fix for #97
+                                // TODO: remove this http-node-specific fix somehow
+                                var req = mm.req;
+                                var res = mm.res;
+                                delete mm.req;
+                                delete mm.res;
+                                var m = clone(mm);
+                                if (req) {
+                                    m.req = req;
+                                    mm.req = req;
+                                }
+                                if (res) {
+                                    m.res = res;
+                                    mm.res = res;
+                                }
+                                node.receive(m);
+                            }
+                        }
+                    }
+                //}
+            }
+        }
+    }
+}
+
+Node.prototype.receive = function(msg) {
+    this.emit("input",msg);
+}
+
+function log_helper(self, level, msg) {
+    var o = {level:level, id:self.id, type:self.type, msg:msg};
+    if (self.name) {
+        o.name = self.name;
+    }
+    self.emit("log",o);
+}
+
+Node.prototype.log = function(msg) {
+    log_helper(this, 'log', msg);
+}
+
+Node.prototype.warn = function(msg) {
+    log_helper(this, 'warn', msg);
+}
+
+Node.prototype.error = function(msg) {
+    log_helper(this, 'error', msg);
+}
+
+/**
+ * status: { fill:"red|green", shape:"dot|ring", text:"blah" }
+ */
+Node.prototype.status = function(status) {
+    comms.publish("status/"+this.id,status,true);
+}
+module.exports = Node;