[inspector] use own copy of third_party/inspector_protocol

third_party/inspector_protocol/CheckProtocolCompatibility.py

Index: third_party/inspector_protocol/CheckProtocolCompatibility.py
diff --git a/third_party/inspector_protocol/CheckProtocolCompatibility.py b/third_party/inspector_protocol/CheckProtocolCompatibility.py
new file mode 100755
index 0000000000000000000000000000000000000000..dd9acad898b43e439653540948fea5bc2d9c66f8
--- /dev/null
+++ b/third_party/inspector_protocol/CheckProtocolCompatibility.py
@@ -0,0 +1,479 @@
+#!/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 = "<object>"
+        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": "<transient>", "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": "<transient>", "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] <protocol-1> [, <protocol-2>...]\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())