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agent.js
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agent.js
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"use strict";
var util = require("util");
var EventEmitter2 = require("eventemitter2").EventEmitter2;
var EventYoshi = require("eventyoshi");
var parseUA = require("./ua");
// TODO: Periodic GC of missing Agents.
// var periodic = require("./periodic");
function Agent(manager, registration) {
this.manager = manager;
this.id = registration.id;
this.ua = registration.ua;
if (!this.id) {
throw new Error("ID required.");
} else if (!this.ua) {
throw new Error("UA required.");
}
this.name = parseUA(this.ua.userAgent);
this.seen = new Date();
this.waiting = true;
this.connected = true;
this.urlQueue = [];
EventEmitter2.call(this);
// The this.socketEmitter EventYoshi should
// contain at most 1 Socket.io socket.
//
// We use an EventYoshi so that event
// listeners for sockets only need to be
// setup once. We can then connect and
// disconnect the Agent's socket as needed.
this.socketEmitter = new EventYoshi();
this.setupEvents();
this.connect(registration.socket);
}
util.inherits(Agent, EventEmitter2);
Agent.prototype.setupEvents = function () {
var self = this;
self.socketEmitter.on("disconnect", function () {
self.socketEmitter.remove(this.child);
});
self.socketEmitter.on("results", function (data) {
self.emit("results", data);
self.next();
});
self.socketEmitter.on("scriptError", function (details) {
self.emit("scriptError", details);
self.next();
});
};
Agent.prototype.getName = function () {
return this.name;
};
Agent.prototype.getId = function () {
return this.id;
};
Agent.prototype.connect = function (socket) {
this.socketEmitter.add(socket);
};
Agent.prototype.next = function () {
if (this.urlQueue.length) {
this.socketEmitter.emit("navigate", this.urlQueue.shift());
this.waiting = false;
} else {
this.waiting = true;
this.socketEmitter.emit("navigate", this.manager.hub.mountpoint);
this.emit("complete");
}
return !this.waiting;
};
Agent.prototype.available = function () {
return this.waiting;
};
Agent.prototype.dispatch = function (urls) {
if (!this.alive()) {
throw new Error("Agent is dead.");
}
this.urlQueue = urls;
this.next();
};
Agent.prototype.alive = function () {
return this.connected ||
(!this.waiting && ((Date.now() - this.seen) > 3600));
};
function AgentManager(hub) {
this.hub = hub;
this.agents = {};
EventEmitter2.call(this, {
verbose: true
});
}
util.inherits(AgentManager, EventEmitter2);
AgentManager.prototype.getAgents = function () {
var out = [],
self = this;
Object.keys(self.agents).forEach(function (id) {
out.push(self.agents[id]);
});
return out;
};
AgentManager.prototype.getAgent = function (id) {
return this.agents[id];
};
AgentManager.prototype.connectAgent = function (id, ua, socket) {
var self = this,
firstConnect = false,
agent = self.agents[id];
if (!id) {
throw new Error("ID required.");
} else if (!socket) {
throw new Error("Socket required.");
}
if (agent) {
agent.connect(socket);
} else {
firstConnect = true;
agent = self.agents[id] = new Agent(self, {
id: id,
ua: ua,
socket: socket
});
}
if (firstConnect) {
// XXX Serialize the agent to JSON.
self.emit("agentConnect", agent.getName());
agent.once("disconnect", function () {
delete self.agents[agent.id];
self.emit("agentDisconnect", agent.getName());
});
}
self.emit("agentSeen", agent.getName());
};
exports.Agent = Agent;
exports.AgentManager = AgentManager;