add redis to uses_services plugin

contrib/runners/orquesta_runner/tests/integration/BUILD

@@ -5,4 +5,5 @@ __defaults__(
 
 python_tests(
     name="tests",
+    uses=["redis"],
 )

pants-plugins/uses_services/BUILD

@@ -16,5 +16,6 @@ python_tests(
     # overrides={
     #    "mongo_rules_test.py": {"uses": ["mongo"]},
     #    "rabbitmq_rules_test.py": {"uses": ["rabbitmq"]},
+    #    "redis_rules_test.py": {"uses": ["redis"]},
     # },
 )

pants-plugins/uses_services/redis_rules.py

@@ -0,0 +1,168 @@
+# Copyright 2023 The StackStorm Authors.
+#
+# 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.
+from __future__ import annotations
+
+from dataclasses import dataclass
+from textwrap import dedent
+
+from pants.backend.python.goals.pytest_runner import (
+    PytestPluginSetupRequest,
+    PytestPluginSetup,
+)
+from pants.backend.python.util_rules.pex import (
+    PexRequest,
+    PexRequirements,
+    VenvPex,
+    VenvPexProcess,
+    rules as pex_rules,
+)
+from pants.engine.fs import CreateDigest, Digest, FileContent
+from pants.engine.rules import collect_rules, Get, MultiGet, rule
+from pants.engine.process import FallibleProcessResult, ProcessCacheScope
+from pants.engine.target import Target
+from pants.engine.unions import UnionRule
+from pants.util.logging import LogLevel
+
+from uses_services.exceptions import ServiceMissingError, ServiceSpecificMessages
+from uses_services.platform_rules import Platform
+from uses_services.scripts.is_redis_running import (
+    __file__ as is_redis_running_full_path,
+)
+from uses_services.target_types import UsesServicesField
+
+
+@dataclass(frozen=True)
+class UsesRedisRequest:
+    """One or more targets need a running redis service using these settings.
+
+    The coord_* attributes represent the coordination settings from st2.conf.
+    In st2 code, they come from:
+        oslo_config.cfg.CONF.coordination.url
+    """
+
+    # These config opts for integration tests are in:
+    #   conf/st2.dev.conf (copied to conf/st2.ci.conf)
+    # TODO: for int tests: set url by either modifying st2.{dev,ci}.conf on the fly or via env vars.
+
+    #   with our version of oslo.config (newer are slower) we can't directly override opts w/ environment variables.
+
+    coord_url: str = "redis://127.0.0.1:6379"
+
+
+@dataclass(frozen=True)
+class RedisIsRunning:
+    pass
+
+
+class PytestUsesRedisRequest(PytestPluginSetupRequest):
+    @classmethod
+    def is_applicable(cls, target: Target) -> bool:
+        if not target.has_field(UsesServicesField):
+            return False
+        uses = target.get(UsesServicesField).value
+        return uses is not None and "redis" in uses
+
+
+@rule(
+    desc="Ensure redis is running and accessible before running tests.",
+    level=LogLevel.DEBUG,
+)
+async def redis_is_running_for_pytest(
+    request: PytestUsesRedisRequest,
+) -> PytestPluginSetup:
+    # this will raise an error if redis is not running
+    _ = await Get(RedisIsRunning, UsesRedisRequest())
+
+    return PytestPluginSetup()
+
+
+@rule(
+    desc="Test to see if redis is running and accessible.",
+    level=LogLevel.DEBUG,
+)
+async def redis_is_running(
+    request: UsesRedisRequest, platform: Platform
+) -> RedisIsRunning:
+    script_path = "./is_redis_running.py"
+
+    # pants is already watching this directory as it is under a source root.
+    # So, we don't need to double watch with PathGlobs, just open it.
+    with open(is_redis_running_full_path, "rb") as script_file:
+        script_contents = script_file.read()
+
+    script_digest, tooz_pex = await MultiGet(
+        Get(Digest, CreateDigest([FileContent(script_path, script_contents)])),
+        Get(
+            VenvPex,
+            PexRequest(
+                output_filename="tooz.pex",
+                internal_only=True,
+                requirements=PexRequirements({"tooz", "redis"}),
+            ),
+        ),
+    )
+
+    result = await Get(
+        FallibleProcessResult,
+        VenvPexProcess(
+            tooz_pex,
+            argv=(
+                script_path,
+                request.coord_url,
+            ),
+            input_digest=script_digest,
+            description="Checking to see if Redis is up and accessible.",
+            # this can change from run to run, so don't cache results.
+            cache_scope=ProcessCacheScope.PER_SESSION,
+            level=LogLevel.DEBUG,
+        ),
+    )
+    is_running = result.exit_code == 0
+
+    if is_running:
+        return RedisIsRunning()
+
+    # redis is not running, so raise an error with instructions.
+    raise ServiceMissingError.generate(
+        platform=platform,
+        messages=ServiceSpecificMessages(
+            service="redis",
+            service_start_cmd_el_7="service redis start",
+            service_start_cmd_el="systemctl start redis",
+            not_installed_clause_el="this is one way to install it:",
+            install_instructions_el=dedent(
+                """\
+                sudo yum -y install redis
+                # Don't forget to start redis.
+                """
+            ),
+            service_start_cmd_deb="systemctl start redis",
+            not_installed_clause_deb="this is one way to install it:",
+            install_instructions_deb=dedent(
+                """\
+                sudo apt-get install -y mongodb redis
+                # Don't forget to start redis.
+                """
+            ),
+            service_start_cmd_generic="systemctl start redis",
+        ),
+    )
+
+
+def rules():
+    return [
+        *collect_rules(),
+        UnionRule(PytestPluginSetupRequest, PytestUsesRedisRequest),
+        *pex_rules(),
+    ]

pants-plugins/uses_services/redis_rules_test.py

@@ -0,0 +1,90 @@
+# Copyright 2023 The StackStorm Authors.
+#
+# 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.
+from __future__ import annotations
+
+import pytest
+
+from pants.engine.internals.scheduler import ExecutionError
+from pants.testutil.rule_runner import QueryRule, RuleRunner
+
+from .data_fixtures import platform, platform_samples
+from .exceptions import ServiceMissingError
+from .redis_rules import (
+    RedisIsRunning,
+    UsesRedisRequest,
+    rules as redis_rules,
+)
+from .platform_rules import Platform
+
+
+@pytest.fixture
+def rule_runner() -> RuleRunner:
+    return RuleRunner(
+        rules=[
+            *redis_rules(),
+            QueryRule(RedisIsRunning, (UsesRedisRequest, Platform)),
+        ],
+        target_types=[],
+    )
+
+
+def run_redis_is_running(
+    rule_runner: RuleRunner,
+    uses_redis_request: UsesRedisRequest,
+    mock_platform: Platform,
+    *,
+    extra_args: list[str] | None = None,
+) -> RedisIsRunning:
+    rule_runner.set_options(
+        [
+            "--backend-packages=uses_services",
+            *(extra_args or ()),
+        ],
+        env_inherit={"PATH", "PYENV_ROOT", "HOME"},
+    )
+    result = rule_runner.request(
+        RedisIsRunning,
+        [uses_redis_request, mock_platform],
+    )
+    return result
+
+
+# Warning this requires that redis be running
+def test_redis_is_running(rule_runner: RuleRunner) -> None:
+    request = UsesRedisRequest()
+    mock_platform = platform(os="TestMock")
+
+    # we are asserting that this does not raise an exception
+    is_running = run_redis_is_running(rule_runner, request, mock_platform)
+    assert is_running
+
+
+@pytest.mark.parametrize("mock_platform", platform_samples)
+def test_redis_not_running(rule_runner: RuleRunner, mock_platform: Platform) -> None:
+    request = UsesRedisRequest(
+        coord_url="redis://127.100.20.7:10",  # 10 is an unassigned port, unlikely to be used
+    )
+
+    with pytest.raises(ExecutionError) as exception_info:
+        run_redis_is_running(rule_runner, request, mock_platform)
+
+    execution_error = exception_info.value
+    assert len(execution_error.wrapped_exceptions) == 1
+
+    exc = execution_error.wrapped_exceptions[0]
+    assert isinstance(exc, ServiceMissingError)
+
+    assert exc.service == "redis"
+    assert "The redis service does not seem to be running" in str(exc)
+    assert exc.instructions != ""

pants-plugins/uses_services/scripts/is_redis_running.py

@@ -0,0 +1,48 @@
+# Copyright 2023 The StackStorm Authors.
+#
+# 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.
+from __future__ import annotations
+
+import sys
+
+
+def _is_redis_running(coord_url: str) -> bool:
+    """Connect to redis with connection logic that mirrors the st2 code.
+
+    In particular, this is based on:
+      - st2common.services.coordination.coordinator_setup()
+
+    This should not import the st2 code as it should be self-contained.
+    """
+    # late import so that __file__ can be imported in the pants plugin without these imports
+    from tooz import ToozError, coordination
+
+    member_id = "pants-uses_services-redis"
+    coordinator = coordination.get_coordinator(coord_url, member_id)
+    try:
+        coordinator.start(start_heart=False)
+    except ToozError:
+        return False
+    return True
+
+
+if __name__ == "__main__":
+    args = dict((k, v) for k, v in enumerate(sys.argv))
+
+    # unit tests do not use redis, they use use an in-memory coordinator: "zake://"
+    # integration tests use this url with a conf file derived from conf/st2.dev.conf
+    coord_url = args.get(1, "redis://127.0.0.1:6379")
+
+    is_running = _is_redis_running(coord_url)
+    exit_code = 0 if is_running else 1
+    sys.exit(exit_code)

st2tests/integration/orquesta/BUILD

@@ -2,4 +2,5 @@ python_sources()
 
 python_tests(
     name="tests",
+    uses=["redis"],
 )