The chromoting client sends simple logging to the server.

remoting/webapp/me2mom/server_log_entry.js

Index: remoting/webapp/me2mom/server_log_entry.js
diff --git a/remoting/webapp/me2mom/server_log_entry.js b/remoting/webapp/me2mom/server_log_entry.js
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+// 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.prototype.KEY_EVENT_NAME_ = 'event-name';
+/** @private */
+remoting.ServerLogEntry.prototype.VALUE_EVENT_NAME_SESSION_STATE_ =
+    'session-state';
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_ROLE_ = 'role';
+/** @private */
+remoting.ServerLogEntry.prototype.VALUE_ROLE_CLIENT_ = 'client';
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_SESSION_STATE_ = 'session-state';
+
+/**
+ * @private
+ * @param {remoting.ClientSession.State} state
+ * @return {string}
+ */
+remoting.ServerLogEntry.prototype.getValueForSessionState = function(state) {

[Jamie, 2011/11/11 19:08:40]

This also doesn't need to be a member function.

+  switch(state) {
+    case remoting.ClientSession.State.UNKNOWN:
+      return 'unknown';
+    case remoting.ClientSession.State.CREATED:
+      return 'created';
+    case remoting.ClientSession.State.BAD_PLUGIN_VERSION:
+      return 'bad-plugin-version';
+    case remoting.ClientSession.State.UNKNOWN_PLUGIN_ERROR:
+      return 'unknown-plugin-error';
+    case remoting.ClientSession.State.CONNECTING:
+      return 'connecting';
+    case remoting.ClientSession.State.INITIALIZING:
+      return 'initializing';
+    case remoting.ClientSession.State.CONNECTED:
+      return 'connected';
+    case remoting.ClientSession.State.CLOSED:
+      return 'closed';
+    case remoting.ClientSession.State.CONNECTION_FAILED:
+      return 'connection-failed';
+    default:
+      return 'undefined-' + state;
+  }
+};
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_CONNECTION_ERROR_ = 'connection-error';
+
+/**
+ * @private
+ * @param {remoting.ClientSession.ConnectionError} connectionError
+ * @return {string}
+ */
+remoting.ServerLogEntry.prototype.getValueForConnectionError =
+    function(connectionError) {
+  switch(connectionError) {
+    case remoting.ClientSession.ConnectionError.NONE:
+      return 'none';
+    case remoting.ClientSession.ConnectionError.HOST_IS_OFFLINE:
+      return 'host-is-offline';
+    case remoting.ClientSession.ConnectionError.SESSION_REJECTED:
+      return 'session-rejected';
+    case remoting.ClientSession.ConnectionError.INCOMPATIBLE_PROTOCOL:
+      return 'incompatible-protocol';
+    case remoting.ClientSession.ConnectionError.NETWORK_FAILURE:
+      return 'network-failure';
+    case remoting.ClientSession.ConnectionError.OTHER:
+      return 'other';
+    default:
+      return 'unknown-' + connectionError;
+  }
+}
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_OS_NAME_ = 'os-name';
+/** @private */
+remoting.ServerLogEntry.prototype.VALUE_OS_NAME_WINDOWS_ = 'Windows';
+/** @private */
+remoting.ServerLogEntry.prototype.VALUE_OS_NAME_LINUX_ = 'Linux';
+/** @private */
+remoting.ServerLogEntry.prototype.VALUE_OS_NAME_MAC_ = 'Mac';
+/** @private */
+remoting.ServerLogEntry.prototype.VALUE_OS_NAME_CHROMEOS_ = 'ChromeOS';
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_OS_VERSION_ = 'os-version';
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_CPU_ = 'cpu';
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_BROWSER_VERSION_ = 'browser-version';
+
+/** @private */
+remoting.ServerLogEntry.prototype.KEY_WEBAPP_VERSION_ = 'webapp-version';
+
+/**
+ * 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;
+};
+
+/**
+ * Converts this object into an XML stanza.
+ *
+ * @return {string}
+ */
+remoting.ServerLogEntry.prototype.toStanza = function() {
+  var stanza = '<gr:entry ';
+  for (var key in this.dict) {
+    stanza += escape(key) + '="' + escape(this.dict[key]) + '" ';
+  }
+  stanza += '/>';
+  return stanza;
+};
+
+/**
+ * Makes a log entry for a change of client session state.
+ *
+ * @param {remoting.ClientSession.State} state
+ * @param {remoting.ClientSession.ConnectionError} connectionError
+ * @return {remoting.ServerLogEntry}
+ */
+remoting.ServerLogEntry.prototype.makeClientSessionStateChange =
+    function(state, connectionError) {
+  var entry = new remoting.ServerLogEntry();
+  entry.set(this.KEY_ROLE_, this.VALUE_ROLE_CLIENT_);
+  entry.set(this.KEY_EVENT_NAME_, this.VALUE_EVENT_NAME_SESSION_STATE_);
+  entry.set(this.KEY_SESSION_STATE_, this.getValueForSessionState(state));
+  if (connectionError != remoting.ClientSession.ConnectionError.NONE) {
+    entry.set(this.KEY_CONNECTION_ERROR_,
+              this.getValueForConnectionError(connectionError));
+  }
+  return entry;
+};
+
+/**
+ * Adds fields describing the host to this log entry.
+ */
+remoting.ServerLogEntry.prototype.addHostFields = function() {
+  var host = this.getHostData();
+  if (host) {
+    if (host.os_name.length > 0) {
+      this.set(this.KEY_OS_NAME_, host.os_name);
+    }
+    if (host.os_version.length > 0) {
+      this.set(this.KEY_OS_VERSION_, host.os_version);
+    }
+    if (host.cpu.length > 0) {
+      this.set(this.KEY_CPU_, host.cpu);
+    }
+  }
+};
+
+/**
+ * Extracts host data from the userAgent string.
+ *
+ * @private
+ * @return {{os_name:string, os_version:string, cpu:string} | null}
+ */
+remoting.ServerLogEntry.prototype.getHostData = function() {
+  return this.extractHostDataFrom(navigator.userAgent);
+};
+
+/**
+ * Extracts host data from the given userAgent string.
+ *
+ * @private
+ * @param {string} s
+ * @return {{os_name:string, os_version:string, cpu:string} | null}
+ */
+remoting.ServerLogEntry.prototype.extractHostDataFrom = function(s) {
+  // Sample userAgent strings:
+  // 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 ' +
+  //   '(KHTML, like Gecko) Chrome/15.0.874.106 Safari/535.2'
+  // 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.8 ' +
+  //   '(KHTML, like Gecko) Chrome/17.0.933.0 Safari/535.8'
+  // 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/535.1 ' +
+  //   '(KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1'
+  // 'Mozilla/5.0 (X11; CrOS i686 14.811.154) AppleWebKit/535.1 ' +
+  //   '(KHTML, like Gecko) Chrome/14.0.835.204 Safari/535.1'
+  var match = new RegExp('Windows NT ([0-9\\.]*)').exec(s);
+  if (match && (match.length >= 2)) {
+    return {
+        'os_name': this.VALUE_OS_NAME_WINDOWS_,
+        'os_version': match[1],
+        'cpu': ''
+    };
+  }
+  match = new RegExp('Linux ([a-zA-Z0-9_]*)').exec(s);
+  if (match && (match.length >= 2)) {
+    return {
+        'os_name': this.VALUE_OS_NAME_LINUX_,
+        'os_version' : '',
+        'cpu': match[1]
+    };
+  }
+  match = new RegExp('([a-zA-Z]*) Mac OS X ([0-9_]*)').exec(s);
+  if (match && (match.length >= 3)) {
+    return {
+        'os_name': this.VALUE_OS_NAME_MAC_,
+        'os_version': match[2].replace(/_/g, '.'),
+        'cpu': match[1]
+    };
+  }
+  match = new RegExp('CrOS ([a-zA-Z0-9]*) ([0-9.]*)').exec(s);
+  if (match && (match.length >= 3)) {
+    return {
+        'os_name': this.VALUE_OS_NAME_CHROMEOS_,
+        'os_version': match[2],
+        'cpu': match[1]
+    };
+  }
+  return null;
+};
+
+/**
+ * Adds a field specifying the browser version to this log entry.
+ */
+remoting.ServerLogEntry.prototype.addChromeVersionField = function() {
+  var version = this.getChromeVersion();
+  if (version != null) {
+    this.set(this.KEY_BROWSER_VERSION_, version);
+  }
+};
+
+/**
+ * Extracts the Chrome version from the userAgent string.
+ *
+ * @private
+ * @return {string | null}
+ */
+remoting.ServerLogEntry.prototype.getChromeVersion = function() {
+  return this.extractChromeVersionFrom(navigator.userAgent);
+};
+
+/**
+ * Extracts the Chrome version from the given userAgent string.
+ *
+ * @private
+ * @param {string} s
+ * @return {string | null}
+ */
+remoting.ServerLogEntry.prototype.extractChromeVersionFrom = function(s) {
+  var match = new RegExp('Chrome/([0-9.]*)').exec(s);
+  if (match && (match.length >= 2)) {
+    return match[1];
+  }
+  return null;
+};
+
+/**
+ * Adds a field specifying the webapp version to this log entry.
+ */
+remoting.ServerLogEntry.prototype.addWebappVersionField = function() {
+  this.set(this.KEY_WEBAPP_VERSION_, chrome.app.getDetails().version);
+};