#!/usr/bin/env python # Copyright (c) 2011 Google Inc. All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are # met: # # * Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above # copyright notice, this list of conditions and the following disclaimer # in the documentation and/or other materials provided with the # distribution. # * Neither the name of Google Inc. nor the names of its # contributors may be used to endorse or promote products derived from # this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # # Inspector protocol validator. # # Tests that subsequent protocol changes are not breaking backwards compatibility. # Following violations are reported: # # - Domain has been removed # - Command has been removed # - Required command parameter was added or changed from optional # - Required response parameter was removed or changed to optional # - Event has been removed # - Required event parameter was removed or changed to optional # - Parameter type has changed. # # For the parameters with composite types the above checks are also applied # recursively to every property of the type. # # Adding --show_changes to the command line prints out a list of valid public API changes. import copy import os.path import optparse import sys try: import json except ImportError: import simplejson as json def list_to_map(items, key): result = {} for item in items: if "experimental" not in item and "hidden" not in item: result[item[key]] = item return result def named_list_to_map(container, name, key): if name in container: return list_to_map(container[name], key) return {} def removed(reverse): if reverse: return "added" return "removed" def required(reverse): if reverse: return "optional" return "required" def compare_schemas(d_1, d_2, reverse): errors = [] domains_1 = copy.deepcopy(d_1) domains_2 = copy.deepcopy(d_2) types_1 = normalize_types_in_schema(domains_1) types_2 = normalize_types_in_schema(domains_2) domains_by_name_1 = list_to_map(domains_1, "domain") domains_by_name_2 = list_to_map(domains_2, "domain") for name in domains_by_name_1: domain_1 = domains_by_name_1[name] if name not in domains_by_name_2: errors.append("%s: domain has been %s" % (name, removed(reverse))) continue compare_domains(domain_1, domains_by_name_2[name], types_1, types_2, errors, reverse) return errors def compare_domains(domain_1, domain_2, types_map_1, types_map_2, errors, reverse): domain_name = domain_1["domain"] commands_1 = named_list_to_map(domain_1, "commands", "name") commands_2 = named_list_to_map(domain_2, "commands", "name") for name in commands_1: command_1 = commands_1[name] if name not in commands_2: errors.append("%s.%s: command has been %s" % (domain_1["domain"], name, removed(reverse))) continue compare_commands(domain_name, command_1, commands_2[name], types_map_1, types_map_2, errors, reverse) events_1 = named_list_to_map(domain_1, "events", "name") events_2 = named_list_to_map(domain_2, "events", "name") for name in events_1: event_1 = events_1[name] if name not in events_2: errors.append("%s.%s: event has been %s" % (domain_1["domain"], name, removed(reverse))) continue compare_events(domain_name, event_1, events_2[name], types_map_1, types_map_2, errors, reverse) def compare_commands(domain_name, command_1, command_2, types_map_1, types_map_2, errors, reverse): context = domain_name + "." + command_1["name"] params_1 = named_list_to_map(command_1, "parameters", "name") params_2 = named_list_to_map(command_2, "parameters", "name") # Note the reversed order: we allow removing but forbid adding parameters. compare_params_list(context, "parameter", params_2, params_1, types_map_2, types_map_1, 0, errors, not reverse) returns_1 = named_list_to_map(command_1, "returns", "name") returns_2 = named_list_to_map(command_2, "returns", "name") compare_params_list(context, "response parameter", returns_1, returns_2, types_map_1, types_map_2, 0, errors, reverse) def compare_events(domain_name, event_1, event_2, types_map_1, types_map_2, errors, reverse): context = domain_name + "." + event_1["name"] params_1 = named_list_to_map(event_1, "parameters", "name") params_2 = named_list_to_map(event_2, "parameters", "name") compare_params_list(context, "parameter", params_1, params_2, types_map_1, types_map_2, 0, errors, reverse) def compare_params_list(context, kind, params_1, params_2, types_map_1, types_map_2, depth, errors, reverse): for name in params_1: param_1 = params_1[name] if name not in params_2: if "optional" not in param_1: errors.append("%s.%s: required %s has been %s" % (context, name, kind, removed(reverse))) continue param_2 = params_2[name] if param_2 and "optional" in param_2 and "optional" not in param_1: errors.append("%s.%s: %s %s is now %s" % (context, name, required(reverse), kind, required(not reverse))) continue type_1 = extract_type(param_1, types_map_1, errors) type_2 = extract_type(param_2, types_map_2, errors) compare_types(context + "." + name, kind, type_1, type_2, types_map_1, types_map_2, depth, errors, reverse) def compare_types(context, kind, type_1, type_2, types_map_1, types_map_2, depth, errors, reverse): if depth > 10: return base_type_1 = type_1["type"] base_type_2 = type_2["type"] if base_type_1 != base_type_2: errors.append("%s: %s base type mismatch, '%s' vs '%s'" % (context, kind, base_type_1, base_type_2)) elif base_type_1 == "object": params_1 = named_list_to_map(type_1, "properties", "name") params_2 = named_list_to_map(type_2, "properties", "name") # If both parameters have the same named type use it in the context. if "id" in type_1 and "id" in type_2 and type_1["id"] == type_2["id"]: type_name = type_1["id"] else: type_name = "" context += " %s->%s" % (kind, type_name) compare_params_list(context, "property", params_1, params_2, types_map_1, types_map_2, depth + 1, errors, reverse) elif base_type_1 == "array": item_type_1 = extract_type(type_1["items"], types_map_1, errors) item_type_2 = extract_type(type_2["items"], types_map_2, errors) compare_types(context, kind, item_type_1, item_type_2, types_map_1, types_map_2, depth + 1, errors, reverse) def extract_type(typed_object, types_map, errors): if "type" in typed_object: result = {"id": "", "type": typed_object["type"]} if typed_object["type"] == "object": result["properties"] = [] elif typed_object["type"] == "array": result["items"] = typed_object["items"] return result elif "$ref" in typed_object: ref = typed_object["$ref"] if ref not in types_map: errors.append("Can not resolve type: %s" % ref) types_map[ref] = {"id": "", "type": "object"} return types_map[ref] def normalize_types_in_schema(domains): types = {} for domain in domains: domain_name = domain["domain"] normalize_types(domain, domain_name, types) return types def normalize_types(obj, domain_name, types): if isinstance(obj, list): for item in obj: normalize_types(item, domain_name, types) elif isinstance(obj, dict): for key, value in obj.items(): if key == "$ref" and value.find(".") == -1: obj[key] = "%s.%s" % (domain_name, value) elif key == "id": obj[key] = "%s.%s" % (domain_name, value) types[obj[key]] = obj else: normalize_types(value, domain_name, types) def load_schema(file_name, domains): # pylint: disable=W0613 if not os.path.isfile(file_name): return input_file = open(file_name, "r") json_string = input_file.read() parsed_json = json.loads(json_string) domains += parsed_json["domains"] return parsed_json["version"] def self_test(): def create_test_schema_1(): return [ { "domain": "Network", "types": [ { "id": "LoaderId", "type": "string" }, { "id": "Headers", "type": "object" }, { "id": "Request", "type": "object", "properties": [ {"name": "url", "type": "string"}, {"name": "method", "type": "string"}, {"name": "headers", "$ref": "Headers"}, {"name": "becameOptionalField", "type": "string"}, {"name": "removedField", "type": "string"}, ] } ], "commands": [ { "name": "removedCommand", }, { "name": "setExtraHTTPHeaders", "parameters": [ {"name": "headers", "$ref": "Headers"}, {"name": "mismatched", "type": "string"}, {"name": "becameOptional", "$ref": "Headers"}, {"name": "removedRequired", "$ref": "Headers"}, {"name": "becameRequired", "$ref": "Headers", "optional": True}, {"name": "removedOptional", "$ref": "Headers", "optional": True}, ], "returns": [ {"name": "mimeType", "type": "string"}, {"name": "becameOptional", "type": "string"}, {"name": "removedRequired", "type": "string"}, {"name": "becameRequired", "type": "string", "optional": True}, {"name": "removedOptional", "type": "string", "optional": True}, ] } ], "events": [ { "name": "requestWillBeSent", "parameters": [ {"name": "frameId", "type": "string", "experimental": True}, {"name": "request", "$ref": "Request"}, {"name": "becameOptional", "type": "string"}, {"name": "removedRequired", "type": "string"}, {"name": "becameRequired", "type": "string", "optional": True}, {"name": "removedOptional", "type": "string", "optional": True}, ] }, { "name": "removedEvent", "parameters": [ {"name": "errorText", "type": "string"}, {"name": "canceled", "type": "boolean", "optional": True} ] } ] }, { "domain": "removedDomain" } ] def create_test_schema_2(): return [ { "domain": "Network", "types": [ { "id": "LoaderId", "type": "string" }, { "id": "Request", "type": "object", "properties": [ {"name": "url", "type": "string"}, {"name": "method", "type": "string"}, {"name": "headers", "type": "object"}, {"name": "becameOptionalField", "type": "string", "optional": True}, ] } ], "commands": [ { "name": "addedCommand", }, { "name": "setExtraHTTPHeaders", "parameters": [ {"name": "headers", "type": "object"}, {"name": "mismatched", "type": "object"}, {"name": "becameOptional", "type": "object", "optional": True}, {"name": "addedRequired", "type": "object"}, {"name": "becameRequired", "type": "object"}, {"name": "addedOptional", "type": "object", "optional": True}, ], "returns": [ {"name": "mimeType", "type": "string"}, {"name": "becameOptional", "type": "string", "optional": True}, {"name": "addedRequired", "type": "string"}, {"name": "becameRequired", "type": "string"}, {"name": "addedOptional", "type": "string", "optional": True}, ] } ], "events": [ { "name": "requestWillBeSent", "parameters": [ {"name": "request", "$ref": "Request"}, {"name": "becameOptional", "type": "string", "optional": True}, {"name": "addedRequired", "type": "string"}, {"name": "becameRequired", "type": "string"}, {"name": "addedOptional", "type": "string", "optional": True}, ] }, { "name": "addedEvent" } ] }, { "domain": "addedDomain" } ] expected_errors = [ "removedDomain: domain has been removed", "Network.removedCommand: command has been removed", "Network.removedEvent: event has been removed", "Network.setExtraHTTPHeaders.mismatched: parameter base type mismatch, 'object' vs 'string'", "Network.setExtraHTTPHeaders.addedRequired: required parameter has been added", "Network.setExtraHTTPHeaders.becameRequired: optional parameter is now required", "Network.setExtraHTTPHeaders.removedRequired: required response parameter has been removed", "Network.setExtraHTTPHeaders.becameOptional: required response parameter is now optional", "Network.requestWillBeSent.removedRequired: required parameter has been removed", "Network.requestWillBeSent.becameOptional: required parameter is now optional", "Network.requestWillBeSent.request parameter->Network.Request.removedField: required property has been removed", "Network.requestWillBeSent.request parameter->Network.Request.becameOptionalField: required property is now optional", ] expected_errors_reverse = [ "addedDomain: domain has been added", "Network.addedEvent: event has been added", "Network.addedCommand: command has been added", "Network.setExtraHTTPHeaders.mismatched: parameter base type mismatch, 'string' vs 'object'", "Network.setExtraHTTPHeaders.removedRequired: required parameter has been removed", "Network.setExtraHTTPHeaders.becameOptional: required parameter is now optional", "Network.setExtraHTTPHeaders.addedRequired: required response parameter has been added", "Network.setExtraHTTPHeaders.becameRequired: optional response parameter is now required", "Network.requestWillBeSent.becameRequired: optional parameter is now required", "Network.requestWillBeSent.addedRequired: required parameter has been added", ] def is_subset(subset, superset, message): for i in range(len(subset)): if subset[i] not in superset: sys.stderr.write("%s error: %s\n" % (message, subset[i])) return False return True def errors_match(expected, actual): return (is_subset(actual, expected, "Unexpected") and is_subset(expected, actual, "Missing")) return (errors_match(expected_errors, compare_schemas(create_test_schema_1(), create_test_schema_2(), False)) and errors_match(expected_errors_reverse, compare_schemas(create_test_schema_2(), create_test_schema_1(), True))) def load_domains_and_baselines(file_name, domains, baseline_domains): version = load_schema(os.path.normpath(file_name), domains) suffix = "-%s.%s.json" % (version["major"], version["minor"]) baseline_file = file_name.replace(".json", suffix) load_schema(os.path.normpath(baseline_file), baseline_domains) return version def main(): if not self_test(): sys.stderr.write("Self-test failed") return 1 cmdline_parser = optparse.OptionParser() cmdline_parser.add_option("--show_changes") cmdline_parser.add_option("--expected_errors") cmdline_parser.add_option("--stamp") arg_options, arg_values = cmdline_parser.parse_args() if len(arg_values) < 1: sys.stderr.write("Usage: %s [--show_changes] [, ...]\n" % sys.argv[0]) return 1 domains = [] baseline_domains = [] version = load_domains_and_baselines(arg_values[0], domains, baseline_domains) for dependency in arg_values[1:]: load_domains_and_baselines(dependency, domains, baseline_domains) expected_errors = [] if arg_options.expected_errors: expected_errors_file = open(arg_options.expected_errors, "r") expected_errors = json.loads(expected_errors_file.read())["errors"] expected_errors_file.close() errors = compare_schemas(baseline_domains, domains, False) unexpected_errors = [] for i in range(len(errors)): if errors[i] not in expected_errors: unexpected_errors.append(errors[i]) if len(unexpected_errors) > 0: sys.stderr.write(" Compatibility checks FAILED\n") for error in unexpected_errors: sys.stderr.write(" %s\n" % error) return 1 if arg_options.show_changes: changes = compare_schemas(domains, baseline_domains, True) if len(changes) > 0: print " Public changes since %s:" % version for change in changes: print " %s" % change if arg_options.stamp: with open(arg_options.stamp, 'a') as _: pass if __name__ == '__main__': sys.exit(main())