3 files changed, 195 insertions, 0 deletions
diff --git a/mediagoblin/init/celery/__init__.py b/mediagoblin/init/celery/__init__.py
new file mode 100644
index 00000000..169cc935
--- /dev/null
+++ b/mediagoblin/init/celery/__init__.py
@@ -0,0 +1,99 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import sys
+
+from celery import Celery
+from mediagoblin.tools.pluginapi import hook_runall
+
+
+MANDATORY_CELERY_IMPORTS = ['mediagoblin.processing.task']
+
+DEFAULT_SETTINGS_MODULE = 'mediagoblin.init.celery.dummy_settings_module'
+
+
+def get_celery_settings_dict(app_config, global_config,
+                             force_celery_always_eager=False):
+    """
+    Get a celery settings dictionary from reading the config
+    """
+    if 'celery' in global_config:
+        celery_conf = global_config['celery']
+    else:
+        celery_conf = {}
+
+    celery_settings = {}
+
+    # Add all celery settings from config
+    for key, value in celery_conf.iteritems():
+        celery_settings[key] = value
+
+    # TODO: use default result stuff here if it exists
+
+    # add mandatory celery imports
+    celery_imports = celery_settings.setdefault('CELERY_IMPORTS', [])
+    celery_imports.extend(MANDATORY_CELERY_IMPORTS)
+
+    if force_celery_always_eager:
+        celery_settings['CELERY_ALWAYS_EAGER'] = True
+        celery_settings['CELERY_EAGER_PROPAGATES_EXCEPTIONS'] = True
+
+    return celery_settings
+
+
+def setup_celery_app(app_config, global_config,
+                     settings_module=DEFAULT_SETTINGS_MODULE,
+                     force_celery_always_eager=False):
+    """
+    Setup celery without using terrible setup-celery-module hacks.
+    """
+    celery_settings = get_celery_settings_dict(
+        app_config, global_config, force_celery_always_eager)
+    celery_app = Celery()
+    celery_app.config_from_object(celery_settings)
+
+    hook_runall('celery_setup', celery_app)
+
+
+def setup_celery_from_config(app_config, global_config,
+                             settings_module=DEFAULT_SETTINGS_MODULE,
+                             force_celery_always_eager=False,
+                             set_environ=True):
+    """
+    Take a mediagoblin app config and try to set up a celery settings
+    module from this.
+
+    Args:
+    - app_config: the application config section
+    - global_config: the entire ConfigObj loaded config, all sections
+    - settings_module: the module to populate, as a string
+    - force_celery_always_eager: whether or not to force celery into
+      always eager mode; good for development and small installs
+    - set_environ: if set, this will CELERY_CONFIG_MODULE to the
+      settings_module
+    """
+    celery_settings = get_celery_settings_dict(
+        app_config, global_config, force_celery_always_eager)
+
+    __import__(settings_module)
+    this_module = sys.modules[settings_module]
+
+    for key, value in celery_settings.iteritems():
+        setattr(this_module, key, value)
+
+    if set_environ:
+        os.environ['CELERY_CONFIG_MODULE'] = settings_module
diff --git a/mediagoblin/init/celery/dummy_settings_module.py b/mediagoblin/init/celery/dummy_settings_module.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/mediagoblin/init/celery/dummy_settings_module.py
diff --git a/mediagoblin/init/celery/from_celery.py b/mediagoblin/init/celery/from_celery.py
new file mode 100644
index 00000000..b395a826
--- /dev/null
+++ b/mediagoblin/init/celery/from_celery.py
@@ -0,0 +1,96 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import logging
+import logging.config
+
+from celery.signals import setup_logging
+
+from mediagoblin import app, mg_globals
+from mediagoblin.init.celery import setup_celery_from_config
+from mediagoblin.tools.pluginapi import hook_runall
+
+
+OUR_MODULENAME = __name__
+
+_log = logging.getLogger(__name__)
+
+
+def setup_logging_from_paste_ini(loglevel, **kw):
+    if os.path.exists(os.path.abspath('paste_local.ini')):
+        logging_conf_file = 'paste_local.ini'
+    else:
+        logging_conf_file = 'paste.ini'
+
+    # allow users to set up explicitly which paste file to check via the
+    # PASTE_CONFIG environment variable
+    logging_conf_file = os.environ.get(
+        'PASTE_CONFIG', logging_conf_file)
+
+    if not os.path.exists(logging_conf_file):
+        raise IOError('{0} does not exist. Logging can not be set up.'.format(
+            logging_conf_file))
+
+    logging.config.fileConfig(logging_conf_file)
+
+    hook_runall('celery_logging_setup')
+
+
+setup_logging.connect(setup_logging_from_paste_ini)
+
+
+def setup_self(check_environ_for_conf=True, module_name=OUR_MODULENAME,
+               default_conf_file=None):
+    """
+    Transform this module into a celery config module by reading the
+    mediagoblin config file.  Set the environment variable
+    MEDIAGOBLIN_CONFIG to specify where this config file is.
+
+    By default it defaults to 'mediagoblin.ini'.
+
+    Note that if celery_setup_elsewhere is set in your config file,
+    this simply won't work.
+    """
+    if not default_conf_file:
+        if os.path.exists(os.path.abspath('mediagoblin_local.ini')):
+            default_conf_file = 'mediagoblin_local.ini'
+        else:
+            default_conf_file = 'mediagoblin.ini'
+
+    if check_environ_for_conf:
+        mgoblin_conf_file = os.path.abspath(
+            os.environ.get('MEDIAGOBLIN_CONFIG', default_conf_file))
+    else:
+        mgoblin_conf_file = default_conf_file
+
+    if not os.path.exists(mgoblin_conf_file):
+        raise IOError(
+            "MEDIAGOBLIN_CONFIG not set or file does not exist")
+
+    # By setting the environment variable here we should ensure that
+    # this is the module that gets set up.
+    os.environ['CELERY_CONFIG_MODULE'] = module_name
+    app.MediaGoblinApp(mgoblin_conf_file, setup_celery=False)
+
+    setup_celery_from_config(
+        mg_globals.app_config, mg_globals.global_config,
+        settings_module=module_name,
+        set_environ=False)
+
+
+if os.environ['CELERY_CONFIG_MODULE'] == OUR_MODULENAME:
+    setup_self()