test: add OTLP output support to integration tests

Extend the test infrastructure to support both gRPC and OTLP output
modes. Both servers translate their native message format into the
test's Event/Process types, keeping protocol-specific code isolated.

Changes:
- Add EventServer base class with shared queue/wait logic
- Add GrpcServer translating FileActivity protobufs into Events
- Add OtlpServer receiving OTLP/HTTP binary protobuf log exports
- Refactor Event.diff() and Process.diff() to compare Event vs Event
- Add --output pytest option (grpc, otlp, all; default: grpc)
- Parameterize server fixture so tests run per output mode
- Add pytest-otlp and pytest-all Makefile targets
- Fix rust_style_quote to match Rust shlex backslash handling
- Add opentelemetry-proto dependency
- Add CARGO_ARGS build arg to Containerfile
- Add image-otel Makefile target

Assisted-by: claude-opus-4-6@default <noreply@opencode.ai>

Author: Molter73

Containerfile

@@ -40,9 +40,10 @@ COPY . .
 FROM builder AS build
 
 ARG FACT_VERSION
+ARG CARGO_ARGS=""
 RUN --mount=type=cache,target=/root/.cargo/registry \
     --mount=type=cache,target=/app/target \
-    cargo build --release && \
+    cargo build --release $CARGO_ARGS && \
     cp target/release/fact fact
 
 FROM ubi-micro-base

Makefile

@@ -20,6 +20,15 @@ image:
 		-t $(FACT_IMAGE_NAME) \
 		$(CURDIR)
 
+image-otel:
+	$(DOCKER) build \
+		-f Containerfile \
+		--build-arg FACT_VERSION=$(FACT_VERSION) \
+		--build-arg RUST_VERSION=$(RUST_VERSION) \
+		--build-arg CARGO_ARGS="--features otel" \
+		-t $(FACT_IMAGE_NAME)-otel \
+		$(CURDIR)
+
 licenses:THIRD_PARTY_LICENSES.html
 
 THIRD_PARTY_LICENSES.html:Cargo.lock
@@ -54,4 +63,4 @@ format:
 	make -C fact-ebpf format
 	ruff format tests/
 
-.PHONY: tag mock-server integration-tests image image-name licenses coverage lint clean
+.PHONY: tag mock-server integration-tests image image-otel image-name licenses coverage lint clean

tests/Makefile

@@ -3,7 +3,13 @@ include ../constants.mk
 all: pytest
 
 pytest: grpc-gen
-	pytest --image="${FACT_IMAGE_NAME}" --junit-xml=results.xml
+	pytest --image="${FACT_IMAGE_NAME}" --output=grpc --junit-xml=results.xml
+
+pytest-otlp: grpc-gen
+	pytest --image="${FACT_IMAGE_NAME}" --output=otlp --junit-xml=results-otlp.xml
+
+pytest-all: grpc-gen
+	pytest --image="${FACT_IMAGE_NAME}-otel" --output=all --junit-xml=results-all.xml
 
 PYOUT = $(CURDIR)
 
@@ -29,4 +35,4 @@ clean:
 	rm -rf logs.tar.gz
 	rm -f results.xml
 
-.PHONY: all pytest grpc-gen lint clean
+.PHONY: all pytest pytest-otlp pytest-all grpc-gen lint clean

tests/conftest.py

@@ -12,7 +12,7 @@
 import requests
 import yaml
 
-from server import FileActivityService
+from server import EventServer, GrpcServer, OtlpServer
 
 # Declare files holding fixtures
 pytest_plugins = ['test_editors.commons']
@@ -67,12 +67,34 @@ def docker_client():
     return docker.from_env()
 
 
+def _get_output_modes(config: pytest.Config) -> list[str]:
+    output = config.getoption('--output')
+    assert isinstance(output, str)
+    if output == 'all':
+        return ['grpc', 'otlp']
+    return [output]
+
+
+def pytest_generate_tests(metafunc: pytest.Metafunc):
+    if 'server' in metafunc.fixturenames:
+        modes = _get_output_modes(metafunc.config)
+        metafunc.parametrize('server', modes, indirect=True)
+
+
 @pytest.fixture
-def server():
+def server(request: pytest.FixtureRequest):
     """
-    Fixture to start and stop the FileActivityService.
+    Start and stop an event server.
+
+    Parameterised via --output to create either a GrpcServer or an
+    OtlpServer. When --output=all, every test that uses this fixture
+    runs once per output mode.
     """
-    s = FileActivityService()
+    mode = request.param
+    if mode == 'otlp':
+        s: EventServer = OtlpServer()
+    else:
+        s = GrpcServer()
     s.serve()
     yield s
     s.stop()
@@ -114,18 +136,16 @@ def fact_config(
     request: pytest.FixtureRequest,
     monitored_dir: str,
     logs_dir: str,
+    server: EventServer,
 ):
     cwd = os.getcwd()
-    config = {
+    config: dict = {
         'paths': [
             f'{monitored_dir}',
             f'{monitored_dir}/**/*',
             '/mounted/**/*',
             '/container-dir/**/*',
         ],
-        'grpc': {
-            'url': 'http://127.0.0.1:9999',
-        },
         'endpoint': {
             'address': '127.0.0.1:9000',
             'expose_metrics': True,
@@ -134,6 +154,12 @@ def fact_config(
         'json': True,
         'scan_interval': 0,
     }
+
+    if server.output_mode == 'otlp':
+        config['otel'] = {'endpoint': 'http://127.0.0.1:4318/v1/logs'}
+    else:
+        config['grpc'] = {'url': 'http://127.0.0.1:9999'}
+
     config_file = NamedTemporaryFile(  # noqa: SIM115
         prefix='fact-config-',
         suffix='.yml',
@@ -190,7 +216,7 @@ def fact(
     request: pytest.FixtureRequest,
     docker_client: docker.DockerClient,
     fact_config: tuple[dict, str],
-    server: FileActivityService,
+    server: EventServer,
     logs_dir: str,
     test_file: str,
 ):
@@ -206,6 +232,8 @@ def fact(
         environment={
             'FACT_LOGLEVEL': 'debug',
             'FACT_HOST_MOUNT': '/host',
+            'OTEL_BLRP_SCHEDULE_DELAY': '100',
+            'OTEL_BLRP_MAX_EXPORT_BATCH_SIZE': '1',
         },
         name='fact',
         network_mode='host',
@@ -264,3 +292,10 @@ def pytest_addoption(parser: pytest.Parser):
         default='quay.io/stackrox-io/fact:latest',
         help='The image to be used for testing',
     )
+    parser.addoption(
+        '--output',
+        action='store',
+        default='grpc',
+        choices=['grpc', 'otlp', 'all'],
+        help='Output mode to test: grpc, otlp, or all (default: grpc)',
+    )

tests/event.py

@@ -15,8 +15,6 @@ def override(func):  # type: ignore[reportMissingParameterType]
 
 
 import utils
-from internalapi.sensor.collector_pb2 import ProcessSignal
-from internalapi.sensor.sfa_pb2 import FileActivity
 
 
 def extract_container_id(cgroup: str) -> str:
@@ -177,25 +175,26 @@ def container_id(self) -> str:
     def loginuid(self) -> int:
         return self._loginuid
 
-    def diff(self, other: ProcessSignal) -> dict | None:
+    def diff(self, other: Process) -> dict | None:
         """
-        Compare this Process with a ProcessSignal protobuf message.
+        Compare this Process with another Process instance.
+
+        PID comparison is skipped if self.pid is None.
 
         Args:
-            other: ProcessSignal protobuf message to compare against
+            other: Process instance to compare against.
 
         Returns:
-            None if identical, dict of differences if not matching
+            None if identical, dict of differences if not matching.
         """
         diff = {}
 
-        # Compare each field
         if self.pid is not None:
             Event._diff_field(diff, 'pid', self.pid, other.pid)
 
         Event._diff_field(diff, 'uid', self.uid, other.uid)
         Event._diff_field(diff, 'gid', self.gid, other.gid)
-        Event._diff_field(diff, 'exe_path', self.exe_path, other.exec_file_path)
+        Event._diff_field(diff, 'exe_path', self.exe_path, other.exe_path)
         Event._diff_field(diff, 'args', self.args, other.args)
         Event._diff_field(diff, 'name', self.name, other.name)
         Event._diff_field(
@@ -204,7 +203,7 @@ def diff(self, other: ProcessSignal) -> dict | None:
             self.container_id,
             other.container_id,
         )
-        Event._diff_field(diff, 'loginuid', self.loginuid, other.login_uid)
+        Event._diff_field(diff, 'loginuid', self.loginuid, other.loginuid)
 
         return diff if diff else None
 
@@ -302,106 +301,77 @@ def _diff_path(
         diff: dict,
         name: str,
         expected: str | Pattern[str] | None,
-        actual: str,
+        actual: str | Pattern[str] | None,
     ):
         """
         Compare paths with regex pattern support.
+
+        When expected is a compiled regex pattern, actual must be a
+        string that matches it. Otherwise a simple equality check is
+        performed.
         """
         if isinstance(expected, Pattern):
-            if not expected.match(actual):
+            if not isinstance(actual, str) or not expected.match(actual):
                 diff[name] = {'expected': f'{expected}', 'actual': actual}
         elif expected != actual:
             diff[name] = {'expected': expected, 'actual': actual}
 
-    def diff(self, other: FileActivity) -> dict | None:
+    def diff(self, other: Event) -> dict | None:
         """
-        Compare this Event with a FileActivity protobuf message.
+        Compare this Event with another Event instance.
+
+        Both gRPC and OTLP servers translate their native messages
+        into Event objects, so this method provides a single
+        protocol-agnostic comparison path.
 
         Args:
-            other: FileActivity protobuf message to compare against
+            other: Event instance to compare against.
 
         Returns:
-            None if identical, dict of differences if not matching
+            None if identical, dict of differences if not matching.
         """
         diff = {}
 
-        # Check process differences first
         process_diff = self.process.diff(other.process)
         if process_diff is not None:
             diff['process'] = process_diff
 
-        # Check event type
-        event_type_expected = self.event_type.name.lower()
-        event_type_actual = other.WhichOneof('file')
-
         Event._diff_field(
             diff,
             'event_type',
-            event_type_expected,
-            event_type_actual,
+            self.event_type,
+            other.event_type,
         )
         if diff:
             return diff
 
-        # Get the appropriate event field based on type
-        event_field = getattr(other, event_type_expected)
-
         # Rename handling is a bit different to the rest, since it has
         # new and old paths.
-        if self.event_type == EventType.RENAME:
-            Event._diff_path(diff, 'new_file', self.file, event_field.new.path)
+        if self.event_type != EventType.RENAME:
+            Event._diff_path(diff, 'file', self.file, other.file)
+            Event._diff_path(diff, 'host_path', self.host_path, other.host_path)
+        else:
+            Event._diff_path(diff, 'new_file', self.file, other.file)
             Event._diff_path(
-                diff,
-                'new_host_path',
-                self.host_path,
-                event_field.new.host_path,
+                diff, 'new_host_path', self.host_path, other.host_path
             )
+            Event._diff_path(diff, 'old_file', self.old_file, other.old_file)
             Event._diff_path(
-                diff,
-                'old_file',
-                self.old_file,
-                event_field.old.path,
+                diff, 'old_host_path', self.old_host_path, other.old_host_path
             )
-            Event._diff_path(
-                diff,
-                'old_host_path',
-                self.old_host_path,
-                event_field.old.host_path,
-            )
-            return diff if diff else None
-
-        # Compare file and host_path (common to all event types)
-        # All event types have .activity.path and .activity.host_path
-        # accessed differently
-        Event._diff_path(diff, 'file', self.file, event_field.activity.path)
-        Event._diff_path(
-            diff,
-            'host_path',
-            self.host_path,
-            event_field.activity.host_path,
-        )
 
         if self.event_type == EventType.PERMISSION:
-            Event._diff_field(diff, 'mode', self.mode, event_field.mode)
+            Event._diff_field(diff, 'mode', self.mode, other.mode)
         elif self.event_type == EventType.OWNERSHIP:
             Event._diff_field(
-                diff,
-                'owner_uid',
-                self.owner_uid,
-                event_field.uid,
+                diff, 'owner_uid', self.owner_uid, other.owner_uid
             )
             Event._diff_field(
-                diff,
-                'owner_gid',
-                self.owner_gid,
-                event_field.gid,
+                diff, 'owner_gid', self.owner_gid, other.owner_gid
             )
         elif self.event_type in (EventType.XATTR_SET, EventType.XATTR_REMOVE):
             Event._diff_field(
-                diff,
-                'xattr_name',
-                self.xattr_name,
-                event_field.xattr_name,
+                diff, 'xattr_name', self.xattr_name, other.xattr_name
             )
 
         return diff if diff else None

tests/requirements.txt

@@ -1,6 +1,7 @@
 docker==7.1.0
 grpcio==1.76.0
 grpcio-tools==1.76.0
+opentelemetry-proto==1.43.0
 pytest==8.4.1
 requests==2.32.4
 pyyaml==6.0.3