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+ # -*- coding: utf-8 -*-
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+ # Copyright (c) 2019 Red Hat, Inc.
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+ #
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+ # Permission is hereby granted, free of charge, to any person obtaining a copy
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+ # of this software and associated documentation files (the "Software"), to deal
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+ # in the Software without restriction, including without limitation the rights
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+ # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ # copies of the Software, and to permit persons to whom the Software is
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+ # furnished to do so, subject to the following conditions:
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+ #
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+ # The above copyright notice and this permission notice shall be included in all
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+ # copies or substantial portions of the Software.
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+ #
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+ # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+ # SOFTWARE.
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+
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+ # For an up-to-date version of this module, see:
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+ # https://pagure.io/monitor-flask-sqlalchemy
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+
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+ import os
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+ import tempfile
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+
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+ from flask import Blueprint, Response
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+ from prometheus_client import ( # noqa: F401
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+ ProcessCollector, CollectorRegistry, Counter, multiprocess,
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+ Histogram, generate_latest, start_http_server, CONTENT_TYPE_LATEST)
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+ from sqlalchemy import event
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+
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+ # Service-specific imports
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+ from module_build_service.utils import cors_header, validate_api_version
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+
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+
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+ if not os.environ.get('prometheus_multiproc_dir'):
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+ os.environ.setdefault('prometheus_multiproc_dir', tempfile.mkdtemp())
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+ registry = CollectorRegistry()
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+ ProcessCollector(registry=registry)
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+ multiprocess.MultiProcessCollector(registry)
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+ if os.getenv('MONITOR_STANDALONE_METRICS_SERVER_ENABLE', 'false') == 'true':
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+ port = os.getenv('MONITOR_STANDALONE_METRICS_SERVER_PORT', '10040')
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+ start_http_server(int(port), registry=registry)
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+
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+
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+ # Generic metrics
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+ messaging_rx_counter = Counter(
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+ 'messaging_rx',
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+ 'Total number of messages received',
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+ registry=registry)
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+ messaging_rx_processed_ok_counter = Counter(
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+ 'messaging_rx_processed_ok',
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+ 'Number of received messages, which were processed successfully',
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+ registry=registry)
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+ messaging_rx_failed_counter = Counter(
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+ 'messaging_rx_failed',
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+ 'Number of received messages, which failed during processing',
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+ registry=registry)
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+
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+ messaging_tx_to_send_counter = Counter(
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+ 'messaging_tx_to_send',
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+ 'Total number of messages to send',
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+ registry=registry)
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+ messaging_tx_sent_ok_counter = Counter(
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+ 'messaging_tx_sent_ok',
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+ 'Number of messages, which were sent successfully',
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+ registry=registry)
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+ messaging_tx_failed_counter = Counter(
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+ 'messaging_tx_failed',
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+ 'Number of messages, for which the sender failed',
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+ registry=registry)
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+
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+ db_dbapi_error_counter = Counter(
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+ 'db_dbapi_error',
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+ 'Number of DBAPI errors',
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+ registry=registry)
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+ db_engine_connect_counter = Counter(
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+ 'db_engine_connect',
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+ 'Number of \'engine_connect\' events',
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+ registry=registry)
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+ db_handle_error_counter = Counter(
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+ 'db_handle_error',
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+ 'Number of exceptions during connection',
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+ registry=registry)
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+ db_transaction_rollback_counter = Counter(
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+ 'db_transaction_rollback',
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+ 'Number of transactions, which were rolled back',
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+ registry=registry)
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+
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+ # Service-specific metrics
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+ # XXX: TODO
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+
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+
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+ def db_hook_event_listeners(target=None):
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+ # Service-specific import of db
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+ from module_build_service import db
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+
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+ if not target:
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+ target = db.engine
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+
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+ @event.listens_for(target, 'dbapi_error', named=True)
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+ def receive_dbapi_error(**kw):
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+ db_dbapi_error_counter.inc()
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+
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+ @event.listens_for(target, 'engine_connect')
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+ def receive_engine_connect(conn, branch):
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+ db_engine_connect_counter.inc()
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+
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+ @event.listens_for(target, 'handle_error')
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+ def receive_handle_error(exception_context):
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+ db_handle_error_counter.inc()
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+
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+ @event.listens_for(target, 'rollback')
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+ def receive_rollback(conn):
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+ db_transaction_rollback_counter.inc()
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+
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+
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+ monitor_api = Blueprint(
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+ 'monitor', __name__,
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+ url_prefix='/module-build-service/<int:api_version>/monitor')
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+
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+
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+ @cors_header()
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+ @validate_api_version()
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+ @monitor_api.route('/metrics')
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+ def metrics(api_version):
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+ return Response(generate_latest(registry),
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+ content_type=CONTENT_TYPE_LATEST)
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This adds monitor module providing Prometheus export for the common set of metrics (as of now).