Format the coding style across the codebase using "black" and manual tweaks

The main benefit of this commit is that the use of double quotes
is now consistent.

module_build_service/monitor.py

@@ -27,77 +27,76 @@ import tempfile
 
 from flask import Blueprint, Response
 from prometheus_client import (  # noqa: F401
-    ProcessCollector, CollectorRegistry, Counter, multiprocess, Histogram, generate_latest,
-    start_http_server, CONTENT_TYPE_LATEST)
+    ProcessCollector,
+    CollectorRegistry,
+    Counter,
+    multiprocess,
+    Histogram,
+    generate_latest,
+    start_http_server,
+    CONTENT_TYPE_LATEST,
+)
 from sqlalchemy import event
 
 # Service-specific imports
 from module_build_service.utils import cors_header, validate_api_version
 
 
-if not os.environ.get('prometheus_multiproc_dir'):
-    os.environ.setdefault('prometheus_multiproc_dir', tempfile.mkdtemp())
+if not os.environ.get("prometheus_multiproc_dir"):
+    os.environ.setdefault("prometheus_multiproc_dir", tempfile.mkdtemp())
 registry = CollectorRegistry()
 ProcessCollector(registry=registry)
 multiprocess.MultiProcessCollector(registry)
-if os.getenv('MONITOR_STANDALONE_METRICS_SERVER_ENABLE', 'false') == 'true':
-    port = os.getenv('MONITOR_STANDALONE_METRICS_SERVER_PORT', '10040')
+if os.getenv("MONITOR_STANDALONE_METRICS_SERVER_ENABLE", "false") == "true":
+    port = os.getenv("MONITOR_STANDALONE_METRICS_SERVER_PORT", "10040")
     start_http_server(int(port), registry=registry)
 
 
 # Generic metrics
 messaging_rx_counter = Counter(
-    'messaging_rx',
-    'Total number of messages received',
-    registry=registry)
+    "messaging_rx", "Total number of messages received", registry=registry
+)
 messaging_rx_processed_ok_counter = Counter(
-    'messaging_rx_processed_ok',
-    'Number of received messages, which were processed successfully',
-    registry=registry)
+    "messaging_rx_processed_ok",
+    "Number of received messages, which were processed successfully",
+    registry=registry,
+)
 messaging_rx_failed_counter = Counter(
-    'messaging_rx_failed',
-    'Number of received messages, which failed during processing',
-    registry=registry)
+    "messaging_rx_failed",
+    "Number of received messages, which failed during processing",
+    registry=registry,
+)
 
 messaging_tx_to_send_counter = Counter(
-    'messaging_tx_to_send',
-    'Total number of messages to send',
-    registry=registry)
+    "messaging_tx_to_send", "Total number of messages to send", registry=registry
+)
 messaging_tx_sent_ok_counter = Counter(
-    'messaging_tx_sent_ok',
-    'Number of messages, which were sent successfully',
-    registry=registry)
+    "messaging_tx_sent_ok", "Number of messages, which were sent successfully", registry=registry
+)
 messaging_tx_failed_counter = Counter(
-    'messaging_tx_failed',
-    'Number of messages, for which the sender failed',
-    registry=registry)
+    "messaging_tx_failed", "Number of messages, for which the sender failed", registry=registry
+)
 
 builder_success_counter = Counter(
-    'builds_success',
-    'Number of successful builds',
-    registry=registry)
+    "builds_success", "Number of successful builds", registry=registry
+)
 builder_failed_counter = Counter(
-    'builds_failed_total',
-    'Number of failed builds',
-    labelnames=['reason'],      # reason could be: 'user', 'infra', 'unspec'
-    registry=registry)
+    "builds_failed_total",
+    "Number of failed builds",
+    labelnames=["reason"],  # reason could be: 'user', 'infra', 'unspec'
+    registry=registry,
+)
 
-db_dbapi_error_counter = Counter(
-    'db_dbapi_error',
-    'Number of DBAPI errors',
-    registry=registry)
+db_dbapi_error_counter = Counter("db_dbapi_error", "Number of DBAPI errors", registry=registry)
 db_engine_connect_counter = Counter(
-    'db_engine_connect',
-    'Number of \'engine_connect\' events',
-    registry=registry)
+    "db_engine_connect", "Number of 'engine_connect' events", registry=registry
+)
 db_handle_error_counter = Counter(
-    'db_handle_error',
-    'Number of exceptions during connection',
-    registry=registry)
+    "db_handle_error", "Number of exceptions during connection", registry=registry
+)
 db_transaction_rollback_counter = Counter(
-    'db_transaction_rollback',
-    'Number of transactions, which were rolled back',
-    registry=registry)
+    "db_transaction_rollback", "Number of transactions, which were rolled back", registry=registry
+)
 
 # Service-specific metrics
 # XXX: TODO
@@ -110,31 +109,29 @@ def db_hook_event_listeners(target=None):
     if not target:
         target = db.engine
 
-    @event.listens_for(target, 'dbapi_error', named=True)
+    @event.listens_for(target, "dbapi_error", named=True)
     def receive_dbapi_error(**kw):
         db_dbapi_error_counter.inc()
 
-    @event.listens_for(target, 'engine_connect')
+    @event.listens_for(target, "engine_connect")
     def receive_engine_connect(conn, branch):
         db_engine_connect_counter.inc()
 
-    @event.listens_for(target, 'handle_error')
+    @event.listens_for(target, "handle_error")
     def receive_handle_error(exception_context):
         db_handle_error_counter.inc()
 
-    @event.listens_for(target, 'rollback')
+    @event.listens_for(target, "rollback")
     def receive_rollback(conn):
         db_transaction_rollback_counter.inc()
 
 
 monitor_api = Blueprint(
-    'monitor', __name__,
-    url_prefix='/module-build-service/<int:api_version>/monitor')
+    "monitor", __name__, url_prefix="/module-build-service/<int:api_version>/monitor")
 
 
 @cors_header()
 @validate_api_version()
-@monitor_api.route('/metrics')
+@monitor_api.route("/metrics")
 def metrics(api_version):
-    return Response(generate_latest(registry),
-                    content_type=CONTENT_TYPE_LATEST)
+    return Response(generate_latest(registry), content_type=CONTENT_TYPE_LATEST)