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# frozen_string_literal: true
# Copyright 2023 Google LLC
#
# 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
#
# https://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.
module Google
module Cloud
class Env
##
# Access to system environment variables.
#
# This is a hashlike object that controls access to environment variable
# data. It supports temporarily changing the data source (i.e. swapping
# ::ENV out for a different set of data) for mocking.
#
class Variables
##
# Create an enviroment variables access object. This is initially
# backed by the actual environment variables (i.e. ENV).
#
def initialize
@backing_data = ::ENV
end
##
# Fetch the given environment variable from the backing data.
#
# @param key [String]
# @return [String,nil]
#
def [] key
@backing_data[key.to_s]
end
alias get []
##
# The backing data is a hash or hash-like object that represents the
# environment variable data. This can either be the actual environment
# variables object (i.e. ENV) or a substitute hash used for mocking.
#
# @return [Hash{String=>String}]
#
attr_accessor :backing_data
##
# Run the given block with the backing data replaced with the given
# hash. The original backing data is restored afterward. This is used
# for debugging/testing/mocking.
#
# @param temp_backing_data [Hash{String=>String}]
#
def with_backing_data temp_backing_data
old_backing_data = @backing_data
begin
@backing_data = temp_backing_data
yield
ensure
@backing_data = old_backing_data
end
end
end
end
end
end
|
