| 123456789101112131415161718192021222324252627282930313233343536373839404142 | # Copyright 2020 gRPC authors.## Licensed under the Apache License, Version 2.0 (the "License");# you may not use this file except in compliance with the License.# You may obtain a copy of the License at##     http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an "AS IS" BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License."""Buildgen duplicate source validation plugin."""def mako_plugin(dictionary):    """The exported plugin code for verify_duplicate_sources.    This validates that a certain set of libraries don't contain    duplicate source files which may cause One Definition Rule (ODR)    violation.    """    errors = []    target_groups = (        ('gpr', 'grpc', 'grpc++'),        ('gpr', 'grpc_unsecure', 'grpc++_unsecure'),    )    lib_map = {lib['name']: lib for lib in dictionary.get('libs')}    for target_group in target_groups:        src_map = {}        for target in target_group:            for src in lib_map[target]['src']:                if src.endswith('.cc'):                    if src in src_map:                        errors.append(                            'Source {0} is used in both {1} and {2}'.format(                                src, src_map[src], target))                    else:                        src_map[src] = target    if errors:        raise Exception('\n'.join(errors))
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