Publisher of rule processing reports using Confluent

ccx_messaging/publishers/rule_processing_publisher.py

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+# Copyright 2019, 2020, 2021, 2022 Red Hat 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.
+
+"""Module that implements a custom Kafka publisher."""
+
+import json
+import logging
+from json import JSONDecodeError
+
+from confluent_kafka import KafkaException, Producer
+from insights_messaging.publishers import Publisher
+
+from ccx_messaging.error import CCXMessagingError
+
+LOG = logging.getLogger(__name__)
+
+
+class RuleProcessingPublisher(Publisher):
+    """
+    RuleProcessingPublisher will handle the results of the applied rules and publish them to Kafka.
+
+    The results of the data analysis are received as a JSON (string)
+    and turned into a byte array using UTF-8 encoding.
+    The bytes are then sent to the output Kafka topic.
+
+    Custom error handling for the whole pipeline is implemented here.
+    """
+
+    def __init__(self, outgoing_topic, kafka_broker_config=None, **kwargs):
+        """Construct a new `RuleProcessingPublisher` given `kwargs` from the config YAML."""
+        self.topic = outgoing_topic
+        if type(self.topic) is not str:
+            raise CCXMessagingError("outgoing_topic should be an str")
+
+        if kafka_broker_config:
+            kwargs.update(kafka_broker_config)
+
+        if "bootstrap.servers" not in kwargs:
+            raise KafkaException("Broker not configured")
+
+        self.producer = Producer(kwargs)
+        LOG.info(
+            "Producing to topic '%s' on brokers %s", self.topic, kwargs.get("bootstrap.servers")
+        )
+        self.outdata_schema_version = 2
+
+    def publish(self, input_msg, response):
+        """
+        Publish an EOL-terminated JSON message to the output Kafka topic.
+
+        The response is assumed to be a string representing a valid JSON object.
+        A newline character will be appended to it, it will be converted into
+        a byte array using UTF-8 encoding and the result of that will be sent
+        to the producer to produce a message in the output Kafka topic.
+        """
+        # Response is already a string, no need to JSON dump.
+        output_msg = {}
+        try:
+            org_id = int(input_msg["identity"]["identity"]["internal"]["org_id"])
+        except (ValueError, KeyError, TypeError) as err:
+            raise CCXMessagingError(f"Error extracting the OrgID: {err}") from err
+
+        try:
+            account_number = int(input_msg["identity"]["identity"]["account_number"])
+        except (ValueError, KeyError, TypeError) as err:
+            raise CCXMessagingError(f"Error extracting the Account number: {err}") from err
+
+        try:
+            msg_timestamp = input_msg["timestamp"]
+            output_msg = {
+                "OrgID": org_id,
+                "AccountNumber": account_number,
+                "ClusterName": input_msg["cluster_name"],
+                "Report": json.loads(response),
+                "LastChecked": msg_timestamp,
+                "Version": self.outdata_schema_version,
+                "RequestId": input_msg.get("request_id"),
+            }
+
+            message = json.dumps(output_msg) + "\n"
+
+            LOG.debug("Sending response to the %s topic.", self.topic)
+            # Convert message string into a byte array.
+            self.producer.produce(self.topic, message.encode("utf-8"))
+            LOG.debug("Message has been sent successfully.")
+            LOG.debug(
+                "Message context: OrgId=%s, AccountNumber=%s, "
+                'ClusterName="%s", LastChecked="%s, Version=%d"',
+                output_msg["OrgID"],
+                output_msg["AccountNumber"],
+                output_msg["ClusterName"],
+                output_msg["LastChecked"],
+                output_msg["Version"],
+            )
+
+            LOG.info(
+                "Status: Success; "
+                "Topic: %s; "
+                "Partition: %s; "
+                "Offset: %s; "
+                "LastChecked: %s",
+                input_msg.get("topic"),
+                input_msg.get("partition"),
+                input_msg.get("offset"),
+                msg_timestamp,
+            )
+
+        except KeyError as err:
+            raise CCXMessagingError("Missing expected keys in the input message") from err
+
+        except (TypeError, UnicodeEncodeError, JSONDecodeError) as err:
+            raise CCXMessagingError(f"Error encoding the response to publish: {response}") from err
+
+    def error(self, input_msg, ex):
+        """Handle pipeline errors by logging them."""
+        # The super call is probably unnecessary because the default behavior
+        # is to do nothing, but let's call it in case it ever does anything.
+        super().error(input_msg, ex)
+
+        if not isinstance(ex, CCXMessagingError):
+            ex = CCXMessagingError(ex)
+
+        LOG.error(ex.format(input_msg))

test/publishers/rule_processing_publisher_test.py

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+# Copyright 2023 Red Hat, 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.
+
+"""Tests for the RuleProcessingPublisher class."""
+
+import json
+from unittest.mock import MagicMock, patch
+
+import pytest
+from confluent_kafka import KafkaException
+
+from ccx_messaging.error import CCXMessagingError
+from ccx_messaging.publishers.rule_processing_publisher import RuleProcessingPublisher
+
+
+def test_init():
+    """Check that init creates a valid object."""
+    kakfa_config = {
+        "bootstrap.servers": "kafka:9092",
+    }
+    RuleProcessingPublisher(outgoing_topic="topic name", **kakfa_config)
+
+
+INVALID_TOPIC_NAMES = [
+    None,
+    b"Topic name",
+    [],
+    {},
+    4,
+    5.5,
+    5 + 2j,
+]
+
+
+@pytest.mark.parametrize("topic_name", INVALID_TOPIC_NAMES)
+def test_init_invalid_topic(topic_name):
+    """Check what happens when the output_topic parameter is not valid."""
+    with pytest.raises(CCXMessagingError):
+        RuleProcessingPublisher(topic_name)
+
+
+INVALID_KWARGS = [
+    {},
+    {"bootstrap_servers": "kafka:9092"},
+    {"bootstrap.servers": "kafka:9092", "unknown_option": "value"},
+]
+
+
+@pytest.mark.parametrize("kwargs", INVALID_KWARGS)
+def test_bad_initialization(kwargs):
+    """Check that init fails when using not valid kwargs."""
+    with pytest.raises(KafkaException):
+        RuleProcessingPublisher(outgoing_topic="topic", **kwargs)
+
+
+@pytest.mark.parametrize("kafka_broker_cfg", INVALID_KWARGS)
+@pytest.mark.parametrize("kwargs", INVALID_KWARGS)
+def test_bad_init_with_kafka_config(kafka_broker_cfg, kwargs):
+    """Check that init fails when using not valid kwargs."""
+    with pytest.raises(KafkaException):
+        RuleProcessingPublisher(outgoing_topic="topic", **kwargs)
+
+
+INVALID_INPUT_MSGS = [
+    None,
+    "",
+    1,
+    2.0,
+    3 + 1j,
+    [],
+    {},  # right type, missing identity
+    {"identity": {}},  # missing identity-identity
+    {"identity": {"identity": {}}},  # missing identity-identity-internal
+    {"identity": {"identity": {"internal": {}}}},  # missing identity-identity-internal-org_id
+    {"identity": {"identity": {"internal": {"org_id": 15.2}}}},  # incorrect org_id type
+    {"identity": {"identity": {"internal": {"org_id": 10}}}},  # missing "account_number"
+    {
+        "identity": {
+            "identity": {
+                "internal": {"org_id": 10},
+                "account_number": 1 + 2j,  # incorrect account number type
+            },
+        },
+    },
+    {
+        "identity": {
+            "identity": {
+                "internal": {"org_id": 10},
+                "account_number": 1,
+            },
+        },
+    },  # missing timestamp
+    {
+        "identity": {
+            "identity": {
+                "internal": {"org_id": 10},
+                "account_number": 1,
+            },
+        },
+        "timestamp": "a timestamp",
+    },  # missing cluster_name
+]
+
+
+@pytest.mark.parametrize("wrong_input_msg", INVALID_INPUT_MSGS)
+def test_publish_bad_argument(wrong_input_msg):
+    """Check that invalid messages passed by the framework are handled gracefully."""
+    sut = RuleProcessingPublisher("outgoing_topic", {"bootstrap.servers": "kafka:9092"})
+    sut.producer = MagicMock()
+
+    with pytest.raises(CCXMessagingError):
+        sut.publish(wrong_input_msg, {})
+        assert not sut.producer.produce.called
+
+
+VALID_INPUT_MSG = {
+    "identity": {
+        "identity": {
+            "internal": {"org_id": 10},
+            "account_number": 1,
+        },
+    },
+    "timestamp": "a timestamp",
+    "cluster_name": "uuid",
+    "request_id": "a request id",
+    "topic": "incoming_topic",
+    "partition": 0,
+    "offset": 100,
+}
+
+
+def test_publish_valid():
+    """Check that Kafka producer is called with an expected message."""
+    report = "{}"
+
+    expected_output = (
+        json.dumps(
+            {
+                "OrgID": 10,
+                "AccountNumber": 1,
+                "ClusterName": "uuid",
+                "Report": {},
+                "LastChecked": "a timestamp",
+                "Version": 2,
+                "RequestId": "a request id",
+            }
+        )
+        + "\n"
+    )
+    sut = RuleProcessingPublisher("outgoing_topic", {"bootstrap.servers": "kafka:9092"})
+    sut.producer = MagicMock()
+
+    sut.publish(VALID_INPUT_MSG, report)
+    sut.producer.produce.assert_called_with("outgoing_topic", expected_output.encode())
+
+
+INVALID_REPORTS = [
+    None,
+    1,
+    2.0,
+    1 + 3j,
+    [],
+    {},
+    "",
+]
+
+
+@pytest.mark.parametrize("invalid_report", INVALID_REPORTS)
+def test_publish_invalid_report(invalid_report):
+    """Check the behaviour of publish when an invalid report is received."""
+    sut = RuleProcessingPublisher("outgoing_topic", {"bootstrap.servers": "kafka:9092"})
+    sut.producer = MagicMock()
+
+    with pytest.raises(CCXMessagingError):
+        sut.publish(VALID_INPUT_MSG, invalid_report)
+        assert not sut.producer.produce.called
+
+
+def test_error():
+    """Check that error just prints a log."""
+    sut = RuleProcessingPublisher("outgoing_topic", {"bootstrap.servers": "kafka:9092"})
+
+    with patch("ccx_messaging.publishers.rule_processing_publisher.LOG") as log_mock:
+        sut.error(VALID_INPUT_MSG, None)
+        assert log_mock.error.called