feat: added support for message provider using pact broker (#257)

* feat: added support for message provider using pact broker

* fix: added new line

* fix: update tests to support pact-broker runs
fix: updated message_pact to wait writing contract process to finish

* fix: removed time from import

Author: pulphix

Makefile

@@ -45,7 +45,7 @@ define messaging
 	cd examples/message
   pip install -r requirements.txt
   pip install -e ../../
-  pytest
+  ./run_pytest.sh
 endef
 export messaging
 

examples/message/README.md

@@ -99,9 +99,6 @@ def test_throw_exception_handler(pact):
 
 ## Provider
 
-Note: The current example only tests the consumer side.
-In the future, provider tests will also be included.
-
 ```
 +-------------------+          +-----------+
 |(Message Provider) | message  | (Pact)    |
@@ -110,10 +107,82 @@ In the future, provider tests will also be included.
 +-------------------+          +-----------+
 ```
 
-## E2E Messaging
+```python
+import pytest
+from pact import MessageProvider
+
+def document_created_handler():
+    return {
+        "event": "ObjectCreated:Put",
+        "documentName": "document.doc",
+        "creator": "TP",
+        "documentType": "microsoft-word"
+    }
+
+
+def test_verify_success():
+    provider = MessageProvider(
+        message_providers={
+            'A document created successfully': document_created_handler
+        },
+        provider='ContentProvider',
+        consumer='DetectContentLambda',
+        pact_dir='pacts'
+
+    )
+    with provider:
+        provider.verify()
+```
+
+
+### Provider with pact broker
+```python
+import pytest
+from pact import MessageProvider
+
+
+PACT_BROKER_URL = "http://localhost"
+PACT_BROKER_USERNAME = "pactbroker"
+PACT_BROKER_PASSWORD = "pactbroker"
+PACT_DIR = "pacts"
+
+
+@pytest.fixture
+def default_opts():
+    return {
+        'broker_username': PACT_BROKER_USERNAME,
+        'broker_password': PACT_BROKER_PASSWORD,
+        'broker_url': PACT_BROKER_URL,
+        'publish_version': '3',
+        'publish_verification_results': False
+    }
+
+def document_created_handler():
+    return {
+        "event": "ObjectCreated:Put",
+        "documentName": "document.doc",
+        "creator": "TP",
+        "documentType": "microsoft-word"
+    }
 
-Note: The current example only tests the consumer side.
-In the future, provider tests will also be included.
+def test_verify_from_broker(default_opts):
+    provider = MessageProvider(
+        message_providers={
+            'A document created successfully': document_created_handler,
+        },
+        provider='ContentProvider',
+        consumer='DetectContentLambda',
+        pact_dir='pacts'
+
+    )
+
+    with pytest.raises(AssertionError):
+        with provider:
+            provider.verify_with_broker(**default_opts)
+
+```
+
+## E2E Messaging
 
 ```
 +-------------------+          +-----------+          +-------------------+

examples/message/conftest.py

@@ -0,0 +1,52 @@
+
+from testcontainers.compose import DockerCompose
+
+import pytest
+
+
+def pytest_addoption(parser):
+    parser.addoption(
+        "--publish-pact", type=str, action="store",
+        help="Upload generated pact file to pact broker with version"
+    )
+
+    parser.addoption(
+        "--provider-url", type=str, action="store",
+        help="The url to our provider."
+    )
+
+    parser.addoption(
+        "--run-broker", type=bool, action="store",
+        help="Whether to run broker in this test or not."
+    )
+
+
+# This fixture is to simulate a managed Pact Broker or Pactflow account
+# Do not do this yourself but setup one of the above
+# https://github.com/pact-foundation/pact_broker
+@pytest.fixture(scope='session', autouse=True)
+def broker(request):
+    version = request.config.getoption('--publish-pact')
+    publish = True if version else False
+
+    # yield
+    if not publish:
+        yield
+        return
+
+    run_broker = request.config.getoption('--run-broker')
+
+    if not run_broker:
+        yield
+        return
+    else:
+        print('Starting broker')
+        with DockerCompose("../broker",
+                           compose_file_name=["docker-compose.yml"],
+                           pull=True) as compose:
+
+            stdout, stderr = compose.get_logs()
+            if stderr:
+                print("Errors\\n:{}".format(stderr))
+            print(stdout)
+            yield

examples/message/run_pytest.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -o pipefail
 
-pytest
+pytest --run-broker True --publish-pact 2
 
 # publish to broker assuming broker is active
 # pytest tests/consumer/test_message_consumer.py::test_publish_to_broker --publish-pact 2

examples/message/tests/conftest.py

@@ -123,6 +123,8 @@ def test_publish_to_broker(pact):
 
     `pytest tests/consumer/test_message_consumer.py::test_publish_pact_to_broker --publish-pact 2`
     """
+    cleanup_json(PACT_FILE)
+
     expected_event = {
         "event": "ObjectCreated:Delete",
         "documentName": "document.doc",

examples/message/tests/consumer/test_message_consumer.py

@@ -1,6 +1,22 @@
 import pytest
 from pact import MessageProvider
 
+PACT_BROKER_URL = "http://localhost"
+PACT_BROKER_USERNAME = "pactbroker"
+PACT_BROKER_PASSWORD = "pactbroker"
+PACT_DIR = "pacts"
+
+
+@pytest.fixture
+def default_opts():
+    return {
+        'broker_username': PACT_BROKER_USERNAME,
+        'broker_password': PACT_BROKER_PASSWORD,
+        'broker_url': PACT_BROKER_URL,
+        'publish_version': '3',
+        'publish_verification_results': False
+    }
+
 
 def document_created_handler():
     return {
@@ -49,3 +65,19 @@ def test_verify_failure_when_a_provider_missing():
     with pytest.raises(AssertionError):
         with provider:
             provider.verify()
+
+
+def test_verify_from_broker(default_opts):
+    provider = MessageProvider(
+        message_providers={
+            'A document created successfully': document_created_handler,
+            'A document deleted successfully': document_deleted_handler
+        },
+        provider='ContentProvider',
+        consumer='DetectContentLambda',
+        pact_dir='pacts'
+
+    )
+
+    with provider:
+        provider.verify_with_broker(**default_opts)

examples/message/tests/provider/test_message_provider.py

@@ -171,6 +171,7 @@ def write_to_pact_file(self):
         ]
 
         self._message_process = Popen(command)
+        self._message_process.wait()
 
     def _insert_message_if_complete(self):
         """

pact/message_pact.py

@@ -115,6 +115,25 @@ def verify(self):
         return_code, _ = verifier.verify_pacts(pact_files, verbose=False)
         assert (return_code == 0), f'Expected returned_code = 0, actual = {return_code}'
 
+    def verify_with_broker(self, enable_pending=False, include_wip_pacts_since=None, **kwargs):
+        """Use Broker to verify.
+
+        Args:
+            broker_username ([String]): broker username
+            broker_password ([String]): broker password
+            broker_url ([String]): url of broker
+            enable_pending ([Boolean])
+            include_wip_pacts_since ([String])
+            publish_version ([String])
+
+        """
+        verifier = Verifier(provider=self.provider,
+                            provider_base_url=self._proxy_url())
+
+        return_code, _ = verifier.verify_with_broker(enable_pending, include_wip_pacts_since, **kwargs)
+
+        assert (return_code == 0), f'Expected returned_code = 0, actual = {return_code}'
+
     def __enter__(self):
         """
         Enter a Python context.

pact/message_provider.py

@@ -3,6 +3,7 @@
 
 from pact.verify_wrapper import VerifyWrapper, path_exists, expand_directories
 
+
 class Verifier(object):
     """A Pact Verifier."""