feat: eventarc function support

docs/generate.sh

@@ -85,6 +85,7 @@ TITLE="Firebase Python SDK for Cloud Functions"
 PY_MODULES='firebase_functions
             firebase_functions.core
             firebase_functions.db_fn
+            firebase_functions.eventarc_fn
             firebase_functions.https_fn
             firebase_functions.options
             firebase_functions.params

samples/basic_eventarc/.firebaserc

@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "python-functions-testing"
+  }
+}

samples/basic_eventarc/.gitignore

@@ -0,0 +1,66 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+firebase-debug.*.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

samples/basic_eventarc/__init__.py

@@ -0,0 +1,3 @@
+# Required to avoid a 'duplicate modules' mypy error
+# in monorepos that have multiple main.py files.
+# https://github.com/python/mypy/issues/4008

samples/basic_eventarc/firebase.json

@@ -0,0 +1,11 @@
+{
+  "functions": [
+    {
+      "source": "functions",
+      "codebase": "default",
+      "ignore": [
+        "venv"
+      ]
+    }
+  ]
+}

samples/basic_eventarc/functions/.gitignore

@@ -0,0 +1,13 @@
+# pyenv
+.python-version
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Environments
+.env
+.venv
+venv/
+venv.bak/
+__pycache__

samples/basic_eventarc/functions/main.py

@@ -0,0 +1,12 @@
+"""Firebase Cloud Functions for Eventarc triggers example."""
+from firebase_functions import eventarc_fn
+
+
+@eventarc_fn.on_custom_event_published(
+    event_type="firebase.extensions.storage-resize-images.v1.complete",)
+def onimageresize(event: eventarc_fn.CloudEvent) -> None:
+    """
+    Handle image resize events from the Firebase Storage Resize Images extension.
+    https://extensions.dev/extensions/firebase/storage-resize-images
+    """
+    print("Received image resize completed event", event)

samples/basic_eventarc/functions/requirements.txt

@@ -0,0 +1,8 @@
+# Not published yet,
+# firebase-functions-python >= 0.0.1
+# so we use a relative path during development:
+./../../../
+# Or switch to git ref for deployment testing:
+# git+https://github.com/firebase/firebase-functions-python.git@main#egg=firebase-functions
+
+firebase-admin >= 6.0.1

src/firebase_functions/eventarc_fn.py

@@ -0,0 +1,88 @@
+# Copyright 2022 Google Inc.
+#
+# 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.
+"""Cloud functions to handle Eventarc events."""
+
+# pylint: disable=protected-access
+import typing as _typing
+import functools as _functools
+import datetime as _dt
+import cloudevents.http as _ce
+
+import firebase_functions.options as _options
+import firebase_functions.private.util as _util
+from firebase_functions.core import CloudEvent
+
+
+@_util.copy_func_kwargs(_options.EventarcTriggerOptions)
+def on_custom_event_published(
+    **kwargs
+) -> _typing.Callable[[_typing.Callable[[CloudEvent], None]], _typing.Callable[
+    [CloudEvent], None]]:
+    """
+    Creates a handler for events published on the default event eventarc channel.
+
+    Example:
+
+    .. code-block:: python
+
+      from firebase_functions import eventarc_fn
+
+      @eventarc_fn.on_custom_event_published(
+          event_type="firebase.extensions.storage-resize-images.v1.complete",
+      )
+      def onimageresize(event: eventarc_fn.CloudEvent) -> None:
+          pass
+
+    :param \\*\\*kwargs: Options.
+    :type \\*\\*kwargs: as :exc:`firebase_functions.options.EventarcTriggerOptions`
+    :rtype: :exc:`typing.Callable`
+            \\[ \\[ :exc:`firebase_functions.core.CloudEvent` \\], `None` \\]
+            A function that takes a CloudEvent and returns None.
+    """
+    options = _options.EventarcTriggerOptions(**kwargs)
+
+    def on_custom_event_published_decorator(func: _typing.Callable[[CloudEvent],
+                                                                   None]):
+
+        @_functools.wraps(func)
+        def on_custom_event_published_wrapped(raw: _ce.CloudEvent):
+            event_attributes = raw._get_attributes()
+            event_data: _typing.Any = raw.get_data()
+            event_dict = {**event_data, **event_attributes}
+            event: CloudEvent = CloudEvent(
+                data=event_data,
+                id=event_dict["id"],
+                source=event_dict["source"],
+                specversion=event_dict["specversion"],
+                subject=event_dict["subject"]
+                if "subject" in event_dict else None,
+                time=_dt.datetime.strptime(
+                    event_dict["time"],
+                    "%Y-%m-%dT%H:%M:%S.%f%z",
+                ),
+                type=event_dict["type"],
+            )
+            func(event)
+
+        _util.set_func_endpoint_attr(
+            on_custom_event_published_wrapped,
+            options._endpoint(func_name=func.__name__),
+        )
+        _util.set_required_apis_attr(
+            on_custom_event_published_wrapped,
+            options._required_apis(),
+        )
+        return on_custom_event_published_wrapped
+
+    return on_custom_event_published_decorator

src/firebase_functions/options.py

@@ -502,6 +502,66 @@ def _endpoint(
                 **kwargs, event_filters=event_filters, event_type=event_type))))
 
 
+@_dataclasses.dataclass(frozen=True, kw_only=True)
+class EventarcTriggerOptions(EventHandlerOptions):
+    """
+    Options that can be set on an Eventarc trigger.
+    Internal use only.
+    """
+
+    event_type: str
+    """
+    Type of the event to trigger on.
+    """
+
+    channel: str | None = None
+    """
+    ID of the channel. Can be either:
+      * fully qualified channel resource name:
+        `projects/{project}/locations/{location}/channels/{channel-id}`
+      * partial resource name with location and channel ID, in which case
+        the runtime project ID of the function will be used:
+        `locations/{location}/channels/{channel-id}`
+      * partial channel ID, in which case the runtime project ID of the
+        function and `us-central1` as location will be used:
+        `{channel-id}`
+
+    If not specified, the default Firebase channel will be used:
+    `projects/{project}/locations/us-central1/channels/firebase`
+    """
+
+    filters: dict[str, str] | None = None
+    """
+    Eventarc event exact match filter.
+    """
+
+    def _endpoint(
+        self,
+        **kwargs,
+    ) -> _manifest.ManifestEndpoint:
+        event_filters = {} if self.filters is None else self.filters
+        endpoint = _manifest.ManifestEndpoint(**_typing.cast(
+            _typing.Dict,
+            _dataclasses.asdict(super()._endpoint(
+                **kwargs,
+                event_filters=event_filters,
+                event_type=self.event_type,
+            ))))
+        assert endpoint.eventTrigger is not None
+        channel = (self.channel if self.channel is not None else
+                   "locations/us-central1/channels/firebase")
+        endpoint.eventTrigger["channel"] = channel
+        return endpoint
+
+    def _required_apis(self) -> list[_manifest.ManifestRequiredApi]:
+        return [
+            _manifest.ManifestRequiredApi(
+                api="eventarcpublishing.googleapis.com",
+                reason="Needed for custom event functions",
+            )
+        ]
+
+
 @_dataclasses.dataclass(frozen=True, kw_only=True)
 class ScheduleOptions(RuntimeOptions):
     """

tests/test_eventarc_fn.py

@@ -0,0 +1,85 @@
+# Copyright 2022 Google Inc.
+#
+# 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.
+"""Eventarc trigger function tests."""
+import unittest
+from unittest.mock import Mock
+from cloudevents.http import CloudEvent as _CloudEvent
+from firebase_functions.core import CloudEvent
+from firebase_functions.eventarc_fn import on_custom_event_published
+
+
+class TestEventarcFn(unittest.TestCase):
+    """
+    Test Eventarc trigger functions.
+    """
+
+    def test_on_custom_event_published_decorator(self):
+        """
+        Tests the on_custom_event_published decorator functionality by checking
+        that the __firebase_endpoint__ attribute is set properly.
+        """
+        func = Mock(__name__="example_func")
+
+        decorated_func = on_custom_event_published(
+            event_type="firebase.extensions.storage-resize-images.v1.complete",
+        )(func)
+
+        endpoint = getattr(decorated_func, "__firebase_endpoint__")
+        self.assertIsNotNone(endpoint)
+        self.assertIsNotNone(endpoint.eventTrigger)
+        self.assertEqual(
+            endpoint.eventTrigger["eventType"],
+            "firebase.extensions.storage-resize-images.v1.complete",
+        )
+
+    def test_on_custom_event_published_wrapped(self):
+        """
+        Tests the wrapped function created by the on_custom_event_published
+        decorator, ensuring that it correctly processes the raw event and calls
+        the user-provided function with a properly formatted CloudEvent instance.
+        """
+        func = Mock(__name__="example_func")
+        raw_event = _CloudEvent(
+            attributes={
+                "specversion": "1.0",
+                "type": "firebase.extensions.storage-resize-images.v1.complete",
+                "source": "https://example.com/testevent",
+                "id": "1234567890",
+                "subject": "test_subject",
+                "time": "2023-03-11T13:25:37.403Z",
+            },
+            data={
+                "some_key": "some_value",
+            },
+        )
+
+        decorated_func = on_custom_event_published(
+            event_type="firebase.extensions.storage-resize-images.v1.complete",
+        )(func)
+
+        decorated_func(raw_event)
+
+        func.assert_called_once()
+
+        event_arg = func.call_args.args[0]
+        self.assertIsInstance(event_arg, CloudEvent)
+        self.assertEqual(event_arg.data, {"some_key": "some_value"})
+        self.assertEqual(event_arg.id, "1234567890")
+        self.assertEqual(event_arg.source, "https://example.com/testevent")
+        self.assertEqual(event_arg.specversion, "1.0")
+        self.assertEqual(event_arg.subject, "test_subject")
+        self.assertEqual(
+            event_arg.type,
+            "firebase.extensions.storage-resize-images.v1.complete",
+        )