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rod.recipe.appengine 2.0.3

ZC Buildout recipe for setting up a Google App Engine development environment.

Latest Version: 2.0.6

The rod.recipe.appengine is a zc.buildout recipe to build, test and deploy projects for the Google App Engine. It makes it easy to use eggs and resolve their dependencies automatically.

To be honest, this is a recipe for scrambled eggs. It produces a zip file containing all configured external packages in a traditional folder hierarchy.

Credits

Thanks to Attila Olah who provided a patch which fixes two issues where the recipe wasn’t able to find the original pkg_resources.py file. He also enabled the recipe to be used together with distribute as a replacement for setuptools.

Attila Olah also provided a patch for supporting regular expressions when using the exclude option.

Thanks to Tom Lynn for submitting a patch which fixes an issue with symlink on platforms other than UNIX.

Lots of thanks to Gael Pasgrimaud for submitting a patch that allows for zc.recipe.egg options such as extra-paths and entry-points.

A brief documentation

This recipe takes a number of options:

appengine-lib
Path to an already installed appengine library
appserver-script-name
The name of the script in GAE to run the dev. server. The default is ‘dev_appserver.py’. Because there have been intermediate versions of the GAE SDK using ‘dev_appserver2.py’, this script name is configurable.
appserver-run-file
The name of the run function in the “appserver-script-name” script. This name changed in GAE SDK > 1.7.5. Default is “_run_file”. In previous GAE versions it was “run_file”. This switch enables the use of this recipe for older GAE versions.
eggs
List of required eggs
entry-points
A list of entry-point identifiers. See zc.recipe.egg for a more detailed documentation.
exclude
A list of basenames and regular expressions to be excluded when setting up the application files, e.g. the whole ‘tests’ directory.
extra-paths
Extra paths to include in a generated script.
initialization
Specify some Python initialization code. This is very limited. In particular, be aware that leading whitespace is stripped from the code given.
packages
A list of packages to be included into the zip archive, which will be uploaded to the appspot.
patch
Specifies a patch file for patching the SDK source-tree. This option is not allowed if appengine-lib is specified.
patch-options
List of patch options separated by blanks. (Default=-p1)
server-script
The name of the script to run the development server.
src
The directory which contains the project source files.
symlink-gae-runtime
When this flag is True, a symlink to the “_python_runtime.py” script is created in the buildout ‘bin’ directory. This script is needed for newer versions of the GAE SDK. You have to manually remove the symlink when you change this flag from True to False.
url
The url for fetching the google appengine distribution
use_setuptools_pkg_resources
Flag whether the recipe shall copy setuptool’s pkg_resources.py into the app directory rather than writing a dummy version. (Default=False)
zip-name
The name of the zip archive containing all external packages ready to deploy.
zip-packages
Flag whether external packages shall be zipped into a single zip file. (Default=True)

Tests

We will define a buildout template used by the recipe:

>>> buildout_template = """
... [buildout]
... develop = %(dev)s
... parts = sample
...
... [sample]
... recipe = rod.recipe.appengine
... eggs = foo.bar
... packages =
...     bazpkg
...     tinypkg
... server-script = dev_appserver
... zip-packages = False
... exclude = .*foo/bar/test.*$
... url = http://googleappengine.googlecode.com/files/google_appengine_1.5.0.zip
... """

We’ll start by creating a buildout:

>>> import os.path
>>> import rod.recipe.appengine.tests as tests
>>> egg_src = os.path.join(os.path.split(tests.__file__)[0], 'foo.bar')
>>> baz_pkg = os.path.join(os.path.split(tests.__file__)[0], 'bazpkg')
>>> tiny_pkg = os.path.join(os.path.split(tests.__file__)[0], 'tinypkg')
>>> write('buildout.cfg', buildout_template %
...       {'dev': egg_src+' '+baz_pkg+' '+tiny_pkg})

Running the buildout gives us:

>>> print system(buildout)
Develop: '.../tests/foo.bar'
Develop: '.../tests/bazpkg'
Develop: '.../tests/tinypkg'
Installing sample.
rod.recipe.appengine: downloading Google App Engine distribution...
Generated script '/sample-buildout/bin/dev_appserver'.
Generated script '/sample-buildout/bin/appcfg'.

This will generate some scripts:

>>> ls('bin')
-  appcfg
-  buildout
-  dev_appserver

And now we try to run the appserver script:

>>> print system(os.path.join('bin', 'dev_appserver'), '-h')
Runs a development application server for an application.
...

There should be a configuration script in bin as well:

>>> print system(os.path.join('bin', 'appcfg'))
Usage: appcfg [options] <action>
...

Let’s see if the ‘tests’ directory has been excluded:

>>> l = os.listdir(os.sep.join(['parts', 'sample', 'foo', 'bar']))
>>> assert 'tests' not in l

There should be a baz package within our application directory:

>>> assert 'baz' in os.listdir(os.sep.join(['parts', 'sample']))

Let’s define another buildout template used by the recipe:

>>> buildout_template = """
... [buildout]
... develop = %(dev)s
... parts = second_sample
...
... [second_sample]
... recipe = rod.recipe.appengine
... eggs = foo.bar
... use_setuptools_pkg_resources = True
... packages =
...     bazpkg
...     tinypkg
... patch = %(patch)s
... patch-options = -p1
... zip-packages = False
... exclude = tests
... url = http://googleappengine.googlecode.com/files/google_appengine_1.5.0.zip
... """

We’ll start by creating a buildout:

>>> import os.path
>>> import rod.recipe.appengine.tests as tests
>>> egg_src = os.path.join(os.path.split(tests.__file__)[0], 'foo.bar')
>>> baz_pkg = os.path.join(os.path.split(tests.__file__)[0], 'bazpkg')
>>> tiny_pkg = os.path.join(os.path.split(tests.__file__)[0], 'tinypkg')
>>> patch = os.path.join(os.path.split(tests.__file__)[0], 'patch.diff')
>>> write('buildout.cfg', buildout_template %
...       {'dev': egg_src+' '+baz_pkg+' '+tiny_pkg, 'patch': patch})

Running the buildout gives us:

>>> output = system(buildout)
>>> if output.endswith(
...     "patching file lib/patched/patched.txt\n"): True
... else: print output
True

And now we try to run the appserver script:

>>> print system(os.path.join('bin', 'second_sample'), '-h')
Runs a development application server for an application.
...

Let’s have a look if all dependent packages are copied into our application directory:

>>> os.path.isfile(os.path.join('parts', 'second_sample', 'tinymodule.py'))
True
>>> os.path.isdir(os.path.join('parts', 'second_sample', 'baz'))
True

Setuptool’s original pkg_resources.py file should be copied into our app directory:

>>> pkg_resources = os.path.join(
...     'parts', 'second_sample', 'pkg_resources.py')
>>> os.path.isfile(pkg_resources)
True
>>> pkg_resources_file = open(pkg_resources, "r")
>>> pkg_resources_file.read().startswith('def _dummy_func')
False
>>> pkg_resources_file.close()

We’ve configured the recipe to patch the SDK’s source tree:

>>> gae_sdk_root = os.path.join('parts', 'google_appengine')
>>> patched_dir = os.listdir(os.path.join(gae_sdk_root, 'lib'))
>>> patched_file = open(
...     os.path.join(gae_sdk_root, 'google', 'appengine', 'tools',
...                  'dev_appserver.py')).read()[:1300]
>>> 'patched' in patched_dir
True
>>> '# This file is patched by the patch command.' in patched_file
True

You can also add some extra script:

>>> buildout_template = """
... [buildout]
... develop = %(dev)s
... parts = script_sample
...
... [script_sample]
... recipe = rod.recipe.appengine
... eggs = foo.bar
... use_setuptools_pkg_resources = True
... packages =
...     bazpkg
...     tinypkg
... zip-packages = False
... exclude = tests
... url = http://googleappengine.googlecode.com/files/google_appengine_1.5.0.zip
... entry-points = manage=django.core:execute_manager
... initialization = import settings
... arguments = settings
... # your script may need some extra-paths
... extra-paths =
...    /some/extra/path
...    ${buildout:parts-directory}/google_appengine/lib/simplejson
... """

We’ll start by creating a buildout:

>>> import os.path
>>> import rod.recipe.appengine.tests as tests
>>> egg_src = os.path.join(os.path.split(tests.__file__)[0], 'foo.bar')
>>> baz_pkg = os.path.join(os.path.split(tests.__file__)[0], 'bazpkg')
>>> tiny_pkg = os.path.join(os.path.split(tests.__file__)[0], 'tinypkg')
>>> write('buildout.cfg', buildout_template %
...       {'dev': egg_src+' '+baz_pkg+' '+tiny_pkg})
>>> print 'Start...', system(buildout)
Start...
Generated script '/sample-buildout/bin/manage'...

Then you get a script:

>>> cat('bin', 'manage')
#!...python...
import sys
sys.path[0:0] = [
    '/some/extra/path',
    '/sample-buildout/parts/google_appengine/lib/simplejson',
    '/sample-buildout/parts/google_appengine',
    ]
<BLANKLINE>
<BLANKLINE>
import settings
<BLANKLINE>
import django.core
<BLANKLINE>
if __name__ == '__main__':
    django.core.execute_manager(settings)

Changes

2.0.3 2013-06-17

  • Fix for issue 18/20/21: appcfg should not use the ‘appserver-run-file’ config. variable.

2.0.2 2013-06-18

  • Added ‘appserver-script-name’ configuration, to accomodate alternative appserver scripts names (some versions in the 1.7.x range used dev_appserver2.py). [jjmurre]
  • Added ‘appserver-run-file’ configurations, because Google changed this name somewhere in the 1.7.x version range. [jjmurre]
  • Added ‘symlink-gae-runtime’. Throught this switch a symlink to the GAE runtime script ‘_python_runtime.py’ can be made in de buildout bin directory. This symlink is needed, because the developments server had been thouroughly rewritten by Google. [jjmurre]

2.0.1 2013-02-21

  • Made dev_appserver configurable (dev_appserver/dev_appserver2) [attilaolah]

2.0.0 2011-07-01

  • Adds support for zc.recipe.eggs options such as entry-points and extra-paths.

1.7.0 2011-05-16

  • Adds support for regular expression excludes.
  • Minor refactoring and clean-up.

1.6.2 2010-04-18

  • Fixes an issue where symlink fails on platforms other than UNIX.

1.6.1 2010-04-03

  • Fixes an issue where the patch option can’t be used without patch-options.

1.6.0 2010-04-03

  • New option to specify a patch file for modifying the Google App Engine SDK source tree.

1.5.1 2010-03-27

  • Fixes an issue where setuptools wasn’t found.
  • Distribute can be used as a replacement for setuptools.
  • Added credits for Attila Olah.

1.5.0 2010-03-27

  • Adds option to copy setuptool’s original pkg_resources.py file into app directory rather than writing a dummy stub.

1.4.1 2010-01-18

1.4.0 2009-08-26

  • Added server-script option.
  • Tests added.

1.3.1 2009-07-15

  • Fixed issue when copying egg contents.

1.3.0 2009-07-04

  • Added options zip-packages and exclude.

1.2.1 2009-07-03

  • Uses a much better method for excluding optional c extensions and compiled modules.
  • A step forward in platform independence.

1.2.0 2009-06-24

  • Creates appcfg script.

1.1.1 2009-06-07

  • Makes symbolic links for application files.
  • Downloads stay untouched.

1.1.0 2009-04-08

  • Mostly rewritten.
  • Installs google appengine as part.
  • Adding dummy pkg_resources module to handle namespace package relicts.
  • Tests added.
  • Ready for Google App Engine SDK 1.2.0

1.0.0b5 2009-01-20

  • Requires Google App Engine SDK 1.1.8

1.0.0b4 2008-09-04

  • Create and use PROJECT_HOME/var to place temporary project files like data base files.

1.0.0b3 2008-09-02

  • Copy package contents to temporary library directory.

1.0.0b2 2008-09-02

  • Installs the whole distribution in the parts directory now. So it is ready to test and deploy.

1.0.0b1 2008-09-01

  • First beta release.
 
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