/
spanner.rb
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/
spanner.rb
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# Copyright 2016 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.
require "google-cloud-spanner"
require "google/cloud/spanner/project"
require "google/cloud/config"
require "google/cloud/env"
module Google
module Cloud
##
# # Cloud Spanner
#
# Cloud Spanner is a fully managed, mission-critical, relational database
# service that offers transactional consistency at global scale, schemas,
# SQL (ANSI 2011 with extensions), and automatic, synchronous replication
# for high availability.
#
# For more information about Cloud Spanner, read the [Cloud
# Spanner Documentation](https://cloud.google.com/spanner/docs/).
#
# See {file:OVERVIEW.md Spanner Overview}.
#
module Spanner
# rubocop:disable Metrics/MethodLength,Metrics/AbcSize
##
# Creates a new object for connecting to the Spanner service.
# Each call creates a new connection.
#
# For more information on connecting to Google Cloud see the
# {file:AUTHENTICATION.md Authentication Guide}.
#
# @param [String] project_id Project identifier for the Spanner service
# you are connecting to. If not present, the default project for the
# credentials is used.
# @param [String, Hash, Google::Auth::Credentials] credentials The path to
# the keyfile as a String, the contents of the keyfile as a Hash, or a
# Google::Auth::Credentials object. (See {Spanner::Credentials})
# If `emulator_host` is present, this becomes optional and the value is
# internally overriden with `:this_channel_is_insecure`.
# @param [String, Array<String>] scope The OAuth 2.0 scopes controlling
# the set of resources and operations that the connection can access.
# See [Using OAuth 2.0 to Access Google
# APIs](https://developers.google.com/identity/protocols/OAuth2).
#
# The default scopes are:
#
# * `https://www.googleapis.com/auth/spanner`
# * `https://www.googleapis.com/auth/spanner.data`
# @param [Integer] timeout Default timeout to use in requests. Optional.
# @param [String] endpoint Override of the endpoint host name. Optional.
# If the param is nil, uses `emulator_host` or the default endpoint.
# @param [String] project Alias for the `project_id` argument. Deprecated.
# @param [String] keyfile Alias for the `credentials` argument.
# Deprecated.
# @param [String] emulator_host Spanner emulator host. Optional.
# If the param is nil, uses the value of the `emulator_host` config.
# @param [String] lib_name Library name. This will be added as a prefix
# to the API call tracking header `x-goog-api-client` with provided
# lib version for telemetry. Optional. For example prefix looks like
# `spanner-activerecord/0.0.1 gccl/1.13.1`. Here,
# `spanner-activerecord/0.0.1` is provided custom library name and
# version and `gccl/1.13.1` represents the Cloud Spanner Ruby library
# with version.
# @param [String] lib_version Library version. This will be added as a
# prefix to the API call tracking header `x-goog-api-client` with
# provided lib name for telemetry. Optional. For example prefix look like
# `spanner-activerecord/0.0.1 gccl/1.13.1`. Here,
# `spanner-activerecord/0.0.1` is provided custom library name and
# version and `gccl/1.13.1` represents the Cloud Spanner Ruby library
# with version.
#
# @return [Google::Cloud::Spanner::Project]
#
# @example
# require "google/cloud/spanner"
#
# spanner = Google::Cloud::Spanner.new
#
def self.new project_id: nil, credentials: nil, scope: nil, timeout: nil,
endpoint: nil, project: nil, keyfile: nil,
emulator_host: nil, lib_name: nil, lib_version: nil
project_id ||= project || default_project_id
scope ||= configure.scope
timeout ||= configure.timeout
emulator_host = present_or_nil(emulator_host) || present_or_nil(configure.emulator_host)
endpoint ||= emulator_host || configure.endpoint
credentials ||= keyfile
lib_name ||= configure.lib_name
lib_version ||= configure.lib_version
if emulator_host
credentials = :this_channel_is_insecure
else
credentials ||= default_credentials scope: scope
unless credentials.is_a? Google::Auth::Credentials
credentials = Spanner::Credentials.new credentials, scope: scope
end
if credentials.respond_to? :project_id
project_id ||= credentials.project_id
end
end
project_id = project_id.to_s # Always cast to a string
raise ArgumentError, "project_id is missing" if project_id.empty?
Spanner::Project.new(
Spanner::Service.new(
project_id, credentials, quota_project: configure.quota_project,
host: endpoint, timeout: timeout, lib_name: lib_name,
lib_version: lib_version
),
query_options: configure.query_options
)
end
# rubocop:enable Metrics/MethodLength,Metrics/AbcSize
##
# Configure the Google Cloud Spanner library.
#
# The following Spanner configuration parameters are supported:
#
# * `project_id` - (String) Identifier for a Spanner project. (The
# parameter `project` is considered deprecated, but may also be used.)
# * `credentials` - (String, Hash, Google::Auth::Credentials) The path to
# the keyfile as a String, the contents of the keyfile as a Hash, or a
# Google::Auth::Credentials object. (See {Spanner::Credentials}) (The
# parameter `keyfile` is considered deprecated, but may also be used.)
# * `scope` - (String, Array<String>) The OAuth 2.0 scopes controlling
# the set of resources and operations that the connection can access.
# * `quota_project` - (String) The project ID for a project that can be
# used by client libraries for quota and billing purposes.
# * `timeout` - (Integer) Default timeout to use in requests.
# * `endpoint` - (String) Override of the endpoint host name, or `nil`
# to use the default endpoint.
# * `emulator_host` - (String) Host name of the emulator. Defaults to
# `ENV["SPANNER_EMULATOR_HOST"]`.
# * `lib_name` - (String) Override the lib name , or `nil`
# to use the default lib name without prefix in agent tracking
# header.
# * `lib_version` - (String) Override the lib version , or `nil`
# to use the default version lib name without prefix in agent
# tracking header.
#
# @return [Google::Cloud::Config] The configuration object the
# Google::Cloud::Spanner library uses.
#
def self.configure
yield Google::Cloud.configure.spanner if block_given?
Google::Cloud.configure.spanner
end
##
# @private Default project.
def self.default_project_id
Google::Cloud.configure.spanner.project_id ||
Google::Cloud.configure.project_id ||
Google::Cloud.env.project_id
end
##
# @private Default credentials.
def self.default_credentials scope: nil
Google::Cloud.configure.spanner.credentials ||
Google::Cloud.configure.credentials ||
Spanner::Credentials.default(scope: scope)
end
##
# @private checks if string is not nil or empty string
# returns the string if present else nil
def self.present_or_nil str
str.to_s.strip.empty? ? nil : str
end
end
end
# @private
Spanner = Cloud::Spanner unless const_defined? :Spanner
end