1# Copyright 2015 gRPC authors.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#     http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15# GRPC contains the General RPC module.
16module GRPC
17  # DefaultLogger is a module included in GRPC if no other logging is set up for
18  # it.  See ../spec/spec_helpers an example of where other logging is added.
19  module DefaultLogger
20    def logger
21      LOGGER
22    end
23
24    private
25
26    # NoopLogger implements the methods of Ruby's conventional logging interface
27    # that are actually used internally within gRPC with a noop implementation.
28    class NoopLogger
29      def info(_ignored)
30      end
31
32      def debug(_ignored)
33      end
34
35      def warn(_ignored)
36      end
37    end
38
39    LOGGER = NoopLogger.new
40  end
41
42  # Inject the noop #logger if no module-level logger method has been injected.
43  extend DefaultLogger unless methods.include?(:logger)
44end
45