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BUG=b:233893248
TEST=CQ

Change-Id: I66591d7a738d241aed3290138c0f68065ab10a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3879174
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/scripts/build_api.py b/scripts/build_api.py
index 2c77a64..abd0d53 100644
--- a/scripts/build_api.py
+++ b/scripts/build_api.py
@@ -19,155 +19,178 @@
 
 
 def GetParser():
-  """Build the argument parser."""
-  parser = commandline.ArgumentParser(description=__doc__)
+    """Build the argument parser."""
+    parser = commandline.ArgumentParser(description=__doc__)
 
-  parser.add_argument(
-      'service_method',
-      help='The "chromite.api.Service/Method" that is being called.')
-  # Input arguments.
-  input_args = parser.add_mutually_exclusive_group(required=True)
-  input_args.add_argument(
-      '--input-binary',
-      type='path',
-      help='Path to the protobuf binary serialization of the input message.')
-  input_args.add_argument(
-      '--input-json',
-      type='path',
-      help='Path to the JSON serialized input argument protobuf message.')
-  # Output options.
-  parser.add_argument(
-      '--output-binary',
-      type='path',
-      help='The path to which the protobuf binary serialization of the '
-           'response message should be written.')
-  parser.add_argument(
-      '--output-json',
-      type='path',
-      help='The path to which the JSON serialization of the response message '
-           'should be written.')
-  # Config options.
-  config_args = parser.add_mutually_exclusive_group()
-  config_args.add_argument(
-      '--config-binary',
-      type='path',
-      help='The path to the protobuf binary serialization of the Build API '
-           'call configs.')
-  config_args.add_argument(
-      '--config-json',
-      type='path',
-      help='The path to the JSON encoded Build API call configs.')
+    parser.add_argument(
+        "service_method",
+        help='The "chromite.api.Service/Method" that is being called.',
+    )
+    # Input arguments.
+    input_args = parser.add_mutually_exclusive_group(required=True)
+    input_args.add_argument(
+        "--input-binary",
+        type="path",
+        help="Path to the protobuf binary serialization of the input message.",
+    )
+    input_args.add_argument(
+        "--input-json",
+        type="path",
+        help="Path to the JSON serialized input argument protobuf message.",
+    )
+    # Output options.
+    parser.add_argument(
+        "--output-binary",
+        type="path",
+        help="The path to which the protobuf binary serialization of the "
+        "response message should be written.",
+    )
+    parser.add_argument(
+        "--output-json",
+        type="path",
+        help="The path to which the JSON serialization of the response message "
+        "should be written.",
+    )
+    # Config options.
+    config_args = parser.add_mutually_exclusive_group()
+    config_args.add_argument(
+        "--config-binary",
+        type="path",
+        help="The path to the protobuf binary serialization of the Build API "
+        "call configs.",
+    )
+    config_args.add_argument(
+        "--config-json",
+        type="path",
+        help="The path to the JSON encoded Build API call configs.",
+    )
 
-  return parser
+    return parser
 
 
 def _ParseArgs(argv, router):
-  """Parse and validate arguments."""
-  parser = GetParser()
-  opts, unknown = parser.parse_known_args(
-      argv, namespace=commandline.ArgumentNamespace())
-  parser.DoPostParseSetup(opts, unknown)
+    """Parse and validate arguments."""
+    parser = GetParser()
+    opts, unknown = parser.parse_known_args(
+        argv, namespace=commandline.ArgumentNamespace()
+    )
+    parser.DoPostParseSetup(opts, unknown)
 
-  if unknown:
-    logging.warning('Unknown args ignored: %s', ' '.join(unknown))
+    if unknown:
+        logging.warning("Unknown args ignored: %s", " ".join(unknown))
 
-  methods = router.ListMethods()
+    methods = router.ListMethods()
 
-  # Positional service_method argument validation.
-  parts = opts.service_method.split('/')
-  if len(parts) != 2:
-    parser.error('Invalid service/method specification format. It should be '
-                 'something like chromite.api.SdkService/Create.')
+    # Positional service_method argument validation.
+    parts = opts.service_method.split("/")
+    if len(parts) != 2:
+        parser.error(
+            "Invalid service/method specification format. It should be "
+            "something like chromite.api.SdkService/Create."
+        )
 
-  if opts.service_method not in methods:
-    # Unknown method, try to match against known methods and make a suggestion.
-    # This is just for developer assistance, e.g. misspellings when testing.
-    matched = matching.GetMostLikelyMatchedObject(
-        methods, opts.service_method, matched_score_threshold=0.6)
-    error = 'Unrecognized service name.'
-    if matched:
-      error += '\nDid you mean: \n%s' % '\n'.join(matched)
-    parser.error(error)
+    if opts.service_method not in methods:
+        # Unknown method, try to match against known methods and make a suggestion.
+        # This is just for developer assistance, e.g. misspellings when testing.
+        matched = matching.GetMostLikelyMatchedObject(
+            methods, opts.service_method, matched_score_threshold=0.6
+        )
+        error = "Unrecognized service name."
+        if matched:
+            error += "\nDid you mean: \n%s" % "\n".join(matched)
+        parser.error(error)
 
-  opts.service = parts[0]
-  opts.method = parts[1]
+    opts.service = parts[0]
+    opts.method = parts[1]
 
-  # Input and output validation.
-  if not opts.output_binary and not opts.output_json:
-    parser.error('At least one output file must be specified.')
+    # Input and output validation.
+    if not opts.output_binary and not opts.output_json:
+        parser.error("At least one output file must be specified.")
 
-  if not os.path.exists(opts.input_binary or opts.input_json):
-    parser.error('Input file does not exist.')
+    if not os.path.exists(opts.input_binary or opts.input_json):
+        parser.error("Input file does not exist.")
 
-  config_msg = build_api_config_pb2.BuildApiConfig()
-  if opts.config_json:
-    handler = message_util.get_message_handler(opts.config_json,
-                                               message_util.FORMAT_JSON)
-  else:
-    handler = message_util.get_message_handler(opts.config_binary,
-                                               message_util.FORMAT_BINARY)
+    config_msg = build_api_config_pb2.BuildApiConfig()
+    if opts.config_json:
+        handler = message_util.get_message_handler(
+            opts.config_json, message_util.FORMAT_JSON
+        )
+    else:
+        handler = message_util.get_message_handler(
+            opts.config_binary, message_util.FORMAT_BINARY
+        )
 
-  if opts.config_json or opts.config_binary:
-    # We have been given a config, so read it.
-    try:
-      handler.read_into(config_msg)
-    except message_util.Error as e:
-      parser.error(str(e))
+    if opts.config_json or opts.config_binary:
+        # We have been given a config, so read it.
+        try:
+            handler.read_into(config_msg)
+        except message_util.Error as e:
+            parser.error(str(e))
 
-  opts.config = api_config_lib.build_config_from_proto(config_msg)
-  opts.config_handler = handler
+    opts.config = api_config_lib.build_config_from_proto(config_msg)
+    opts.config_handler = handler
 
-  opts.Freeze()
-  return opts
+    opts.Freeze()
+    return opts
 
 
 def _get_io_handlers(opts):
-  """Build the input and output handlers."""
-  if opts.input_binary:
-    input_handler = message_util.get_message_handler(opts.input_binary,
-                                                     message_util.FORMAT_BINARY)
-  else:
-    input_handler = message_util.get_message_handler(opts.input_json,
-                                                     message_util.FORMAT_JSON)
+    """Build the input and output handlers."""
+    if opts.input_binary:
+        input_handler = message_util.get_message_handler(
+            opts.input_binary, message_util.FORMAT_BINARY
+        )
+    else:
+        input_handler = message_util.get_message_handler(
+            opts.input_json, message_util.FORMAT_JSON
+        )
 
-  output_handlers = []
-  if opts.output_binary:
-    handler = message_util.get_message_handler(opts.output_binary,
-                                               message_util.FORMAT_BINARY)
-    output_handlers.append(handler)
-  if opts.output_json:
-    handler = message_util.get_message_handler(opts.output_json,
-                                               message_util.FORMAT_JSON)
-    output_handlers.append(handler)
+    output_handlers = []
+    if opts.output_binary:
+        handler = message_util.get_message_handler(
+            opts.output_binary, message_util.FORMAT_BINARY
+        )
+        output_handlers.append(handler)
+    if opts.output_json:
+        handler = message_util.get_message_handler(
+            opts.output_json, message_util.FORMAT_JSON
+        )
+        output_handlers.append(handler)
 
-  return input_handler, output_handlers
+    return input_handler, output_handlers
 
 
 def main(argv):
-  router = router_lib.GetRouter()
-  opts = _ParseArgs(argv, router)
+    router = router_lib.GetRouter()
+    opts = _ParseArgs(argv, router)
 
-  # We currently don't have any APIs that want to access stdin, so rebind.
-  sys.stdin = open(os.devnull, 'r')  # pylint: disable=consider-using-with
-  os.dup2(sys.stdin.fileno(), 0)
+    # We currently don't have any APIs that want to access stdin, so rebind.
+    sys.stdin = open(os.devnull, "r")  # pylint: disable=consider-using-with
+    os.dup2(sys.stdin.fileno(), 0)
 
-  if opts.config.log_path:
-    logging.warning('Ignoring log_path config option')
-  if 'BUILD_API_TEE_LOG_FILE' in os.environ:
-    logging.warning('Ignoring $BUILD_API_TEE_LOG_FILE env var')
+    if opts.config.log_path:
+        logging.warning("Ignoring log_path config option")
+    if "BUILD_API_TEE_LOG_FILE" in os.environ:
+        logging.warning("Ignoring $BUILD_API_TEE_LOG_FILE env var")
 
-  if opts.config.mock_invalid:
-    # --mock-invalid handling. We print error messages, but no output is ever
-    # set for validation errors, so we can handle it by just giving back the
-    # correct return code here.
-    return controller.RETURN_CODE_INVALID_INPUT
+    if opts.config.mock_invalid:
+        # --mock-invalid handling. We print error messages, but no output is ever
+        # set for validation errors, so we can handle it by just giving back the
+        # correct return code here.
+        return controller.RETURN_CODE_INVALID_INPUT
 
-  input_handler, output_handlers = _get_io_handlers(opts)
+    input_handler, output_handlers = _get_io_handlers(opts)
 
-  try:
-    return router.Route(opts.service, opts.method, opts.config, input_handler,
-                        output_handlers, opts.config_handler)
-  except router_lib.Error as e:
-    # Handle router_lib.Error derivatives nicely, but let anything else bubble
-    # up.
-    cros_build_lib.Die(e)
+    try:
+        return router.Route(
+            opts.service,
+            opts.method,
+            opts.config,
+            input_handler,
+            output_handlers,
+            opts.config_handler,
+        )
+    except router_lib.Error as e:
+        # Handle router_lib.Error derivatives nicely, but let anything else bubble
+        # up.
+        cros_build_lib.Die(e)