author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 04 Jul 2009 14:19:39 +0200 | |
changeset 2528 | 9de8348890d8 |
parent 2344 | 621252e2cc18 |
permissions | -rw-r--r-- |
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#!/usr/bin/python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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""" |
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An interactive, stateful AJAX shell that runs Python code on the server. |
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|
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Part of http://code.google.com/p/google-app-engine-samples/. |
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|
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May be run as a standalone app or in an existing app as an admin-only handler. |
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Can be used for system administration tasks, as an interactive way to try out |
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APIs, or as a debugging aid during development. |
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|
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The logging, os, sys, db, and users modules are imported automatically. |
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|
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Interpreter state is stored in the datastore so that variables, function |
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definitions, and other values in the global and local namespaces can be used |
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across commands. |
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|
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To use the shell in your app, copy shell.py, static/*, and templates/* into |
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your app's source directory. Then, copy the URL handlers from app.yaml into |
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your app.yaml. |
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|
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TODO: unit tests! |
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""" |
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import logging |
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import new |
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import os |
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import pickle |
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import sys |
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import traceback |
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import types |
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import wsgiref.handlers |
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|
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from django.template import loader |
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from google.appengine.api import users |
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from google.appengine.ext import db |
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from google.appengine.ext import webapp |
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from google.appengine.ext.webapp import template |
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import django.template |
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import gae_django |
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# Set to True if stack traces should be shown in the browser, etc. |
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_DEBUG = True |
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# The entity kind for shell sessions. Feel free to rename to suit your app. |
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_SESSION_KIND = '_Shell_Session' |
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# Types that can't be pickled. |
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UNPICKLABLE_TYPES = ( |
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types.ModuleType, |
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types.TypeType, |
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types.ClassType, |
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types.FunctionType, |
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) |
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# Unpicklable statements to seed new sessions with. |
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INITIAL_UNPICKLABLES = [ |
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'import logging', |
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'import os', |
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'import sys', |
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'from google.appengine.ext import db', |
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'from google.appengine.api import users', |
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] |
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|
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class ShellSession(db.Model): |
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"""A shell session. Stores the session's globals. |
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|
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Each session globals is stored in one of two places: |
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|
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If the global is picklable, it's stored in the parallel globals and |
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global_names list properties. (They're parallel lists to work around the |
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unfortunate fact that the datastore can't store dictionaries natively.) |
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|
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If the global is not picklable (e.g. modules, classes, and functions), or if |
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it was created by the same statement that created an unpicklable global, |
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it's not stored directly. Instead, the statement is stored in the |
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unpicklables list property. On each request, before executing the current |
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statement, the unpicklable statements are evaluated to recreate the |
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unpicklable globals. |
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|
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The unpicklable_names property stores all of the names of globals that were |
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added by unpicklable statements. When we pickle and store the globals after |
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executing a statement, we skip the ones in unpicklable_names. |
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|
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Using Text instead of string is an optimization. We don't query on any of |
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these properties, so they don't need to be indexed. |
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""" |
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global_names = db.ListProperty(db.Text) |
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globals = db.ListProperty(db.Blob) |
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unpicklable_names = db.ListProperty(db.Text) |
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unpicklables = db.ListProperty(db.Text) |
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|
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def set_global(self, name, value): |
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"""Adds a global, or updates it if it already exists. |
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|
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Also removes the global from the list of unpicklable names. |
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|
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Args: |
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name: the name of the global to remove |
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value: any picklable value |
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|
118 |
""" |
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119 |
blob = db.Blob(pickle.dumps(value)) |
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120 |
|
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121 |
if name in self.global_names: |
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122 |
index = self.global_names.index(name) |
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|
123 |
self.globals[index] = blob |
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124 |
else: |
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125 |
self.global_names.append(db.Text(name)) |
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126 |
self.globals.append(blob) |
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127 |
|
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128 |
self.remove_unpicklable_name(name) |
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129 |
|
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130 |
def remove_global(self, name): |
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131 |
"""Removes a global, if it exists. |
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132 |
|
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133 |
Args: |
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134 |
name: string, the name of the global to remove |
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135 |
""" |
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parents:
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|
136 |
if name in self.global_names: |
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137 |
index = self.global_names.index(name) |
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parents:
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|
138 |
del self.global_names[index] |
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|
139 |
del self.globals[index] |
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140 |
|
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parents:
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141 |
def globals_dict(self): |
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142 |
"""Returns a dictionary view of the globals. |
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|
143 |
""" |
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parents:
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144 |
return dict((name, pickle.loads(val)) |
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145 |
for name, val in zip(self.global_names, self.globals)) |
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|
146 |
|
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parents:
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|
147 |
def add_unpicklable(self, statement, names): |
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148 |
"""Adds a statement and list of names to the unpicklables. |
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|
149 |
|
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150 |
Also removes the names from the globals. |
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|
151 |
|
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152 |
Args: |
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153 |
statement: string, the statement that created new unpicklable global(s). |
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parents:
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|
154 |
names: list of strings; the names of the globals created by the statement. |
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parents:
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|
155 |
""" |
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parents:
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|
156 |
self.unpicklables.append(db.Text(statement)) |
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parents:
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|
157 |
|
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|
158 |
for name in names: |
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159 |
self.remove_global(name) |
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parents:
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|
160 |
if name not in self.unpicklable_names: |
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parents:
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|
161 |
self.unpicklable_names.append(db.Text(name)) |
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parents:
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|
162 |
|
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parents:
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|
163 |
def remove_unpicklable_name(self, name): |
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parents:
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|
164 |
"""Removes a name from the list of unpicklable names, if it exists. |
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parents:
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|
165 |
|
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|
166 |
Args: |
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parents:
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|
167 |
name: string, the name of the unpicklable global to remove |
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parents:
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|
168 |
""" |
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parents:
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|
169 |
if name in self.unpicklable_names: |
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parents:
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|
170 |
self.unpicklable_names.remove(name) |
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parents:
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|
171 |
|
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|
172 |
|
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parents:
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|
173 |
class FrontPageHandler(webapp.RequestHandler): |
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parents:
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|
174 |
"""Creates a new session and renders the shell.html template. |
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parents:
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|
175 |
""" |
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parents:
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|
176 |
|
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parents:
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|
177 |
def get(self): |
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parents:
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|
178 |
# set up the session. TODO: garbage collect old shell sessions |
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parents:
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|
179 |
session_key = self.request.get('session') |
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parents:
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|
180 |
if session_key: |
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parents:
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|
181 |
session = ShellSession.get(session_key) |
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parents:
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|
182 |
else: |
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|
183 |
# create a new session |
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parents:
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|
184 |
session = ShellSession() |
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parents:
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|
185 |
session.unpicklables = [db.Text(line) for line in INITIAL_UNPICKLABLES] |
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parents:
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|
186 |
session_key = session.put() |
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parents:
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|
187 |
|
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parents:
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|
188 |
template_file = os.path.join(os.path.dirname(__file__), 'templates', |
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parents:
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|
189 |
'shell.html') |
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parents:
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|
190 |
session_url = '/?session=%s' % session_key |
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parents:
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|
191 |
vars = { 'server_software': os.environ['SERVER_SOFTWARE'], |
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parents:
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|
192 |
'python_version': sys.version, |
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parents:
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|
193 |
'session': str(session_key), |
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parents:
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|
194 |
'user': users.get_current_user(), |
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parents:
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|
195 |
'login_url': users.create_login_url(session_url), |
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parents:
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|
196 |
'logout_url': users.create_logout_url(session_url), |
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parents:
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|
197 |
} |
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parents:
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|
198 |
|
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parents:
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|
199 |
rendered = loader.render_to_string('shell.html', dictionary=vars) |
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parents:
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|
200 |
# rendered = webapp.template.render(template_file, vars, debug=_DEBUG) |
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parents:
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|
201 |
self.response.out.write(rendered) |
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parents:
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|
202 |
|
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parents:
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|
203 |
|
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parents:
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|
204 |
class StatementHandler(webapp.RequestHandler): |
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parents:
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|
205 |
"""Evaluates a python statement in a given session and returns the result. |
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parents:
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|
206 |
""" |
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parents:
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|
207 |
|
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parents:
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|
208 |
def get(self): |
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parents:
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|
209 |
self.response.headers['Content-Type'] = 'text/plain' |
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parents:
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|
210 |
|
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parents:
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|
211 |
# extract the statement to be run |
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parents:
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|
212 |
statement = self.request.get('statement') |
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parents:
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|
213 |
if not statement: |
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parents:
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|
214 |
return |
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parents:
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|
215 |
|
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parents:
diff
changeset
|
216 |
# the python compiler doesn't like network line endings |
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parents:
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|
217 |
statement = statement.replace('\r\n', '\n') |
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parents:
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|
218 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
219 |
# add a couple newlines at the end of the statement. this makes |
366e64ecba91
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parents:
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|
220 |
# single-line expressions such as 'class Foo: pass' evaluate happily. |
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parents:
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|
221 |
statement += '\n\n' |
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parents:
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|
222 |
|
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parents:
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|
223 |
# log and compile the statement up front |
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parents:
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|
224 |
try: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
225 |
logging.info('Compiling and evaluating:\n%s' % statement) |
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parents:
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|
226 |
compiled = compile(statement, '<string>', 'single') |
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parents:
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|
227 |
except: |
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parents:
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|
228 |
self.response.out.write(traceback.format_exc()) |
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parents:
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|
229 |
return |
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parents:
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|
230 |
|
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parents:
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|
231 |
# create a dedicated module to be used as this statement's __main__ |
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parents:
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|
232 |
statement_module = new.module('__main__') |
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parents:
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|
233 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
234 |
# use this request's __builtin__, since it changes on each request. |
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parents:
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|
235 |
# this is needed for import statements, among other things. |
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parents:
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|
236 |
import __builtin__ |
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237 |
statement_module.__builtins__ = __builtin__ |
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|
238 |
|
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parents:
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239 |
# load the session from the datastore |
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240 |
session = ShellSession.get(self.request.get('session')) |
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241 |
|
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parents:
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242 |
# swap in our custom module for __main__. then unpickle the session |
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parents:
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243 |
# globals, run the statement, and re-pickle the session globals, all |
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244 |
# inside it. |
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245 |
old_main = sys.modules.get('__main__') |
366e64ecba91
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|
246 |
try: |
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parents:
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|
247 |
sys.modules['__main__'] = statement_module |
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parents:
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248 |
statement_module.__name__ = '__main__' |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
249 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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250 |
# re-evaluate the unpicklables |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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251 |
for code in session.unpicklables: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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252 |
exec code in statement_module.__dict__ |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
253 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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254 |
# re-initialize the globals |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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255 |
for name, val in session.globals_dict().items(): |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
256 |
try: |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
257 |
statement_module.__dict__[name] = val |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
258 |
except: |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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259 |
msg = 'Dropping %s since it could not be unpickled.\n' % name |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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260 |
self.response.out.write(msg) |
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Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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261 |
logging.warning(msg + traceback.format_exc()) |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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262 |
session.remove_global(name) |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
263 |
|
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
264 |
# run! |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
265 |
old_globals = dict(statement_module.__dict__) |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
266 |
try: |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
267 |
old_stdout = sys.stdout |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
268 |
old_stderr = sys.stderr |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
269 |
try: |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
270 |
sys.stdout = self.response.out |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
271 |
sys.stderr = self.response.out |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
272 |
exec compiled in statement_module.__dict__ |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
273 |
finally: |
366e64ecba91
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parents:
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|
274 |
sys.stdout = old_stdout |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
275 |
sys.stderr = old_stderr |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
276 |
except: |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
277 |
self.response.out.write(traceback.format_exc()) |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
278 |
return |
366e64ecba91
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parents:
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|
279 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
280 |
# extract the new globals that this statement added |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
281 |
new_globals = {} |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
282 |
for name, val in statement_module.__dict__.items(): |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
283 |
if name not in old_globals or val != old_globals[name]: |
366e64ecba91
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parents:
diff
changeset
|
284 |
new_globals[name] = val |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
285 |
|
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
286 |
if True in [isinstance(val, UNPICKLABLE_TYPES) |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
287 |
for val in new_globals.values()]: |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
288 |
# this statement added an unpicklable global. store the statement and |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
289 |
# the names of all of the globals it added in the unpicklables. |
366e64ecba91
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parents:
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|
290 |
session.add_unpicklable(statement, new_globals.keys()) |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
291 |
logging.debug('Storing this statement as an unpicklable.') |
366e64ecba91
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parents:
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|
292 |
|
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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|
293 |
else: |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
294 |
# this statement didn't add any unpicklables. pickle and store the |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
295 |
# new globals back into the datastore. |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
296 |
for name, val in new_globals.items(): |
366e64ecba91
Add web based python shell to Melange.
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parents:
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|
297 |
if not name.startswith('__'): |
366e64ecba91
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parents:
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|
298 |
session.set_global(name, val) |
366e64ecba91
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parents:
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|
299 |
|
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
300 |
finally: |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
301 |
sys.modules['__main__'] = old_main |
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
302 |
|
366e64ecba91
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
303 |
session.put() |
366e64ecba91
Add web based python shell to Melange.
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parents:
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|
304 |
|
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
305 |
|
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
306 |
def main(): |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
307 |
"""Main program. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
308 |
""" |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
309 |
|
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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|
310 |
application = webapp.WSGIApplication( |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
311 |
[('/admin/shell', FrontPageHandler), |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
312 |
('/admin/shell/shell.do', StatementHandler)], debug=_DEBUG) |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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|
313 |
wsgiref.handlers.CGIHandler().run(application) |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
314 |
|
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
315 |
|
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
316 |
if __name__ == '__main__': |
366e64ecba91
Add web based python shell to Melange.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
317 |
main() |