The chromoting client logs a session ID to the server,

remoting/webapp/me2mom/server_log_entry.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * A class of server log entries.
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
  * @private
  * @constructor
  */
 remoting.ServerLogEntry = function() {
   /** @type Object.<string, string> */ this.dict = {};
 };
 
 /** @private */
 remoting.ServerLogEntry.KEY_EVENT_NAME_ = 'event-name';
 /** @private */
 remoting.ServerLogEntry.VALUE_EVENT_NAME_SESSION_STATE_ =
     'session-state';
 
 /** @private */
-remoting.ServerLogEntry.KEY_ID_ = 'id';
+remoting.ServerLogEntry.KEY_SESSION_ID_ = 'session-id';
 
 /** @private */
 remoting.ServerLogEntry.KEY_ROLE_ = 'role';
 /** @private */
 remoting.ServerLogEntry.VALUE_ROLE_CLIENT_ = 'client';
 
 /** @private */
 remoting.ServerLogEntry.KEY_SESSION_STATE_ = 'session-state';
 
 /**
@@ skipping 84 matching lines @@
 
 /** @private */
 remoting.ServerLogEntry.KEY_CPU_ = 'cpu';
 
 /** @private */
 remoting.ServerLogEntry.KEY_BROWSER_VERSION_ = 'browser-version';
 
 /** @private */
 remoting.ServerLogEntry.KEY_WEBAPP_VERSION_ = 'webapp-version';
 
+/** @private */
+remoting.ServerLogEntry.VALUE_EVENT_NAME_SESSION_ID_OLD_ = 'session-id-old';
+
+/** @private */
+remoting.ServerLogEntry.VALUE_EVENT_NAME_SESSION_ID_NEW_ = 'session-id-new';
+
 /**
  * Sets one field in this log entry.
  *
  * @private
  * @param {string} key
  * @param {string} value
  */
 remoting.ServerLogEntry.prototype.set = function(key, value) {
   this.dict[key] = value;
 };
@@ skipping 97 matching lines @@
  * @return {boolean} whether the statistic is non-zero
  */
 remoting.ServerLogEntry.prototype.addStatsField = function(
     entryKey, statsKey, statsAccumulator) {
   var val = statsAccumulator.calcMean(statsKey);
   this.set(entryKey, val.toString());
   return (val != 0);
 };
 
 /**
- * Adds an ID field to this log entry.
+ * Makes a log entry for a "this session ID is old" event.
  *
- * @param {string} id
+ * @param {string} sessionId
+ * @return {remoting.ServerLogEntry}
  */
-remoting.ServerLogEntry.prototype.addIdField = function(id) {
-  this.set(remoting.ServerLogEntry.KEY_ID_, id);
+remoting.ServerLogEntry.makeSessionIdOld = function(sessionId) {
+  var entry = new remoting.ServerLogEntry();
+  entry.set(remoting.ServerLogEntry.KEY_ROLE_,
+            remoting.ServerLogEntry.VALUE_ROLE_CLIENT_);
+  entry.set(remoting.ServerLogEntry.KEY_EVENT_NAME_,
+            remoting.ServerLogEntry.VALUE_EVENT_NAME_SESSION_ID_OLD_);
+  entry.addSessionIdField(sessionId);
+  return entry;
+};
+
+/**
+ * Makes a log entry for a "this session ID is new" event.
+ *
+ * @param {string} sessionId
+ * @return {remoting.ServerLogEntry}
+ */
+remoting.ServerLogEntry.makeSessionIdNew = function(sessionId) {
+  var entry = new remoting.ServerLogEntry();
+  entry.set(remoting.ServerLogEntry.KEY_ROLE_,
+            remoting.ServerLogEntry.VALUE_ROLE_CLIENT_);
+  entry.set(remoting.ServerLogEntry.KEY_EVENT_NAME_,
+            remoting.ServerLogEntry.VALUE_EVENT_NAME_SESSION_ID_NEW_);
+  entry.addSessionIdField(sessionId);
+  return entry;
+};
+
+/**
+ * Adds a session ID field to this log entry.
+ *
+ * @param {string} sessionId
+ */
+remoting.ServerLogEntry.prototype.addSessionIdField = function(sessionId) {
+  this.set(remoting.ServerLogEntry.KEY_SESSION_ID_, sessionId);
 }
 
 /**
  * Adds fields describing the host to this log entry.
  */
 remoting.ServerLogEntry.prototype.addHostFields = function() {
   var host = remoting.ServerLogEntry.getHostData();
   if (host) {
     if (host.os_name.length > 0) {
       this.set(remoting.ServerLogEntry.KEY_OS_NAME_, host.os_name);
@@ skipping 104 matching lines @@
   return null;
 };
 
 /**
  * Adds a field specifying the webapp version to this log entry.
  */
 remoting.ServerLogEntry.prototype.addWebappVersionField = function() {
   this.set(remoting.ServerLogEntry.KEY_WEBAPP_VERSION_,
       chrome.app.getDetails().version);
 };