According to http://code.google.com/appengine/articles/logging.html,
live apps can log information and have it displayed in the
Administration Console. Is it possible to copy this functionality to
the Development Console?
I am aware that I can append ?debug to my URL, however, my application
does a JSON request, and dev_appserver.py destroy my JSON object by
appending:
<!-- Copyright 2007 Google Inc. All Rights Reserved -->
<!--
The below HTML code was generated and appended by Google. It's
purpose is
to display a logging console in the browser. It's appearing here
because
either:
(a) the CGI parameter "debug" was in the URL
(b) the cookie "_ah_severity" was present in the HTTP request
To stop this from being appended, you should remove the CGI
parameter
"debug" from the request URL and then either click the "Close"
link on the
logging console, or delete the "_ah_severity" cookie.
All element ids used by the code for this logging console are
prefixed
with "_ah", all cookies used are prefixed with "_ah", and all
classes and
functions are in the namespace "AH".
-->
<div id="_ah_base"
style="z-index: 99999; position: absolute; right: 10px;
background-color: white; color: black; width: 600px;
border: 1px solid black; padding: 10px; font-family:
courier;
font-size: medium; margin: 10px;">
<table><tr><td>
<table cellspacing=0 cellpadding=0 rules=all border=frame>
<tr>
<td style="background-color: white; cursor: pointer; height:
15px;
width: 15px;"
id="_ah_up_left"
onClick="(new AH.LoggingConsole).moveBaseDiv('up_left')"></
td>
<td style="background-color: white; cursor: pointer; height:
15px;
width: 15px;"
id="_ah_up_right"
onClick="(new AH.LoggingConsole).moveBaseDiv
('up_right')"></td>
</tr>
<tr>
<td style="background-color: white; cursor: pointer; height:
15px;
width: 15px;"
id="_ah_down_left"
onClick="(new AH.LoggingConsole).moveBaseDiv
('down_left')"></td>
<td style="background-color: white; cursor: pointer; height:
15px;
width: 15px;"
id="_ah_down_right"
onClick="(new AH.LoggingConsole).moveBaseDiv
('down_right')"></td>
</tr>
</table>
</td><td valign=top>
<a id="_ah_show_debug"
href="javascript:(new AH.LoggingConsole).changeLogSeverity
('debug')">
DEBUG</a>
<a id="_ah_show_info"
href="javascript:(new AH.LoggingConsole).changeLogSeverity
('info')">
INFO</a>
<a id="_ah_show_warning"
href="javascript:(new AH.LoggingConsole).changeLogSeverity
('warning')">
WARNING</a>
<a id="_ah_show_error"
href="javascript:(new AH.LoggingConsole).changeLogSeverity
('error')">
ERROR</a>
<a id="_ah_show_critical"
href="javascript:(new AH.LoggingConsole).changeLogSeverity
('critical')">
CRITICAL</a>
<a id="_ah_close"
href="javascript:(new AH.LoggingConsole).closeEverything
()">Close</a>
</td></tr></table>
<div id="_ah_loglines" style="margin: 10px; height: 300px; overflow:
auto;">
</div>
</div>
<script>
// Copyright 2007 Google Inc.
// All Rights Reserved.
// 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.
/**
* @fileoverview Defines the code for the application logging console.
*/
/**
* The namespace we're using for all javascript classes and functions
related
* to the logging console.
*/
var AH = {};
/**
* A collection of utility functions for reading and writing cookies.
* @constructor
*/
AH.CookieUtil = function() {};
/**
* Creates and adds a cookie with the specified expiration.
* @param {String} name The name of the desired cookie.
* @param {String} value The value of the desired cookie.
* @param {Number} opt_days If non-negative, the expiration time in
days of the
* desired cookie. If not provided, the default value is 1.
*/
AH.CookieUtil.prototype.setCookie = function(name, value, opt_days) {
if (opt_days == null) {
opt_days = 1;
}
var expires = '';
if (opt_days < 0) {
var date = new Date;
date.setTime(date.getTime() + (opt_days * 24 * 60 * 60 * 1000));
expires = '; expires=' + date.toGMTString();
}
document.cookie = name + '=' + value + expires + '; path=/';
};
/**
* Returns the value of the requested cookie if it is available, and
otherwise
* returns a default value.
* @param {String} name The name of the requested cookie.
* @param {String} defaultValue The value to return if the requested
cookie
* cannot be found.
* @return {String} The requested cookie's value, or the default
value.
*/
AH.CookieUtil.prototype.getCookie = function(name, defaultValue) {
var nameEQ = name + '=';
var cookiePieces = document.cookie.split(';');
for (var i = 0; i < cookiePieces.length; i++) {
var c = cookiePieces[i];
c = c.replace(/^\s+/, '');
if (c.indexOf(nameEQ) == 0) {
return c.substring(nameEQ.length, c.length);
}
}
return defaultValue;
};
/**
* Deletes the specified cookie.
* @param {String} name The name of the specified cookie.
*/
AH.CookieUtil.prototype.removeCookie = function(name) {
this.setCookie(name, '', -100);
};
/**
* The logging console is a div that displays log statements generated
by the
* application during it's execution. It can be moved around, and the
verbosity
* can be adjusted.
* @constructor
*/
AH.LoggingConsole = function() {
this.baseDiv = document.getElementById('_ah_base');
this.logSeverityLevels = ['debug', 'info', 'warning', 'error',
'critical'];
this.cookieUtil = new AH.CookieUtil;
};
/**
* Creates and positions the logging console based on preferences
available from
* the cookies '_ah_severity' and '_ah_position'.
*/
AH.LoggingConsole.prototype.initConsole = function() {
// Define the font colors for the different log severity levels.
this.addCssRule('._ah_logline_debug_prefix', 'color:#110000');
this.addCssRule('._ah_logline_info_prefix', 'color:#440000');
this.addCssRule('._ah_logline_warning_prefix', 'color:#880000');
this.addCssRule('._ah_logline_error_prefix', 'color:#CC0000');
this.addCssRule('._ah_logline_critical_prefix', 'color:#FF0000');
// Change to the severity level stored in the cookie, defaulting to
the lowest
// severity level.
this.changeLogSeverity(this.cookieUtil.getCookie('_ah_severity',
'debug'));
// Move the console to position stored in the cookie, defaulting to
the
// bottom right position.
this.moveBaseDiv(this.cookieUtil.getCookie('_ah_position',
'down_right'));
};
/**
* Add CSS rules to the document to modify the presentation for
elements of the
* specified class name. This works for IE and Firefox, but does not
work for
* Safari.
* @param {String} selector A selector for the style class rule to
modify.
* @param {String} styleRules The rules to add to the specified style
class.
*/
AH.LoggingConsole.prototype.addCssRule = function(selector,
styleRules) {
// If no sheet exists for the document, create one.
var sheet;
if (document.createStyleSheet) {
// For IE:
sheet = document.createStyleSheet();
} else {
// For Firefox:
var styleElement = document.createElement('style');
document.getElementsByTagName('head')[0].appendChild
(styleElement);
sheet = (styleElement.styleSheet ?
styleElement.styleSheet :
styleElement.sheet);
}
// Add the new style rules to the style sheet.
if (sheet.addRule) {
// For IE:
sheet.addRule(selector, styleRules);
} else if (sheet.insertRule) {
// For Firefox:
sheet.insertRule(selector + ' { ' + styleRules + ' }',
sheet.cssRules.length);
}
};
/**
* Change the log severity level, and persist the change to the
'_ah_severity'
* cookie.
* @param {String} newSeverity The desired log severity level.
*/
AH.LoggingConsole.prototype.changeLogSeverity = function(newSeverity)
{
// First, find the numeric level for the provided severity.
var severityLevel = -1;
for (var i = 0; i < this.logSeverityLevels.length; i++) {
if (newSeverity == this.logSeverityLevels[i]) {
severityLevel = i;
}
}
// An unknown logging severity was provided, so ignore the call.
if (severityLevel == -1) {
return;
}
// Display log lines if they have severity greater than or equal to
the
// desired severity.
for (var i = 0; i < this.logSeverityLevels.length; i++) {
var selector =
'._ah_logline_' + this.logSeverityLevels[i];
if (i < severityLevel) {
this.addCssRule(selector, 'display:none');
} else {
this.addCssRule(selector, 'display:block');
}
}
// Update the link text colors for the severity controls, and blur
the links.
for (var i = 0; i < this.logSeverityLevels.length; i++) {
var linkToUpdate = document.getElementById(
'_ah_show_' + this.logSeverityLevels[i]);
if (i == severityLevel) {
linkToUpdate.style.color = 'red';
} else {
linkToUpdate.style.color = 'blue';
}
linkToUpdate.blur();
}
// Save the new severity level to a cookie.
this.cookieUtil.setCookie('_ah_severity', newSeverity);
};
/**
* Set the colors for the whole navigation table to white.
*/
AH.LoggingConsole.prototype.clearNavigationTable = function() {
document.getElementById('_ah_up_left').style.backgroundColor =
'white';
document.getElementById('_ah_up_right').style.backgroundColor =
'white';
document.getElementById('_ah_down_left').style.backgroundColor =
'white';
document.getElementById('_ah_down_right').style.backgroundColor =
'white';
};
/**
* Moves the logging console to the desired position.
* @param {String} newPosition The desired position, which must be
one of
* 'up_left', 'up_right', 'down_left', or 'down_right'.
*/
AH.LoggingConsole.prototype.moveBaseDiv = function(newPosition) {
// Move the logging console to the desired position on the page.
var newPositionPieces = newPosition.split('_');
var newVerticalPosition = newPositionPieces[0];
var newHorizontalPosition = newPositionPieces[1];
if (newVerticalPosition == 'up') {
this.baseDiv.style.top = '10px';
this.baseDiv.style.bottom = '';
} else {
this.baseDiv.style.top = '';
this.baseDiv.style.bottom = '10px';
}
if (newHorizontalPosition == 'left') {
this.baseDiv.style.left = '10px';
this.baseDiv.style.right = '';
} else {
this.baseDiv.style.left = '';
this.baseDiv.style.right = '10px';
}
// Update the navigation table cell colors to reflect the new
position.
this.clearNavigationTable();
document.getElementById('_ah_' + newPosition).style.backgroundColor
= 'red';
// Save the new position to a cookie.
this.cookieUtil.setCookie('_ah_position', newPosition);
};
/**
* Disable the logging console, and delete all cookies which were
storing
* logging console preferences.
*/
AH.LoggingConsole.prototype.closeEverything = function() {
this.cookieUtil.removeCookie('_ah_severity');
this.cookieUtil.removeCookie('_ah_position');
this.baseDiv.style.display = 'none';
};
// Display a logging console on top of this page.
(new AH.LoggingConsole()).initConsole();
</script>
I am using SDK version 1.1.7
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