google-api-ruby-client/lib/google/api_client/reference.rb

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# Copyright 2010 Google Inc.
#
# 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.
require 'stringio'
require 'json'
require 'addressable/uri'
require 'google/api_client/discovery'
module Google
class APIClient
class Reference
def initialize(options={})
# We only need this to do lookups on method ID String values
# It's optional, but method ID lookups will fail if the client is
# omitted.
@client = options[:client]
@version = options[:version] || 'v1'
self.api_method = options[:api_method]
self.parameters = options[:parameters] || {}
self.headers = options[:headers] || []
if options[:body]
self.body = options[:body]
elsif options[:merged_body]
self.merged_body = options[:merged_body]
elsif options[:body_object]
if options[:body_object].respond_to?(:to_json)
serialized_body = options[:body_object].to_json
elsif options[:body_object].respond_to?(:to_hash)
serialized_body = JSON.generate(options[:body_object].to_hash)
else
raise TypeError,
'Could not convert body object to JSON.' +
'Must respond to :to_json or :to_hash.'
end
self.merged_body = serialized_body
else
self.merged_body = ''
end
unless self.api_method
self.http_method = options[:http_method] || 'GET'
self.uri = options[:uri]
end
end
def api_method
return @api_method
end
def api_method=(new_api_method)
if new_api_method.kind_of?(Google::APIClient::Method) ||
new_api_method == nil
@api_method = new_api_method
elsif new_api_method.respond_to?(:to_str) ||
new_api_method.kind_of?(Symbol)
unless @client
raise ArgumentError,
"API method lookup impossible without client instance."
end
new_api_method = new_api_method.to_s
# This method of guessing the API is unreliable. This will fail for
# APIs where the first segment of the RPC name does not match the
# service name. However, this is a fallback mechanism anyway.
# Developers should be passing in a reference to the method, rather
# than passing in a string or symbol. This should raise an error
# in the case of a mismatch.
api = new_api_method[/^([^.]+)\./, 1]
@api_method = @client.discovered_method(
new_api_method, api, @version
)
if @api_method
# Ditch the client reference, we won't need it again.
@client = nil
else
raise ArgumentError, "API method could not be found."
end
else
raise TypeError,
"Expected Google::APIClient::Method, got #{new_api_method.class}."
end
end
def parameters
return @parameters
end
def parameters=(new_parameters)
# No type-checking needed, the Method class handles this.
@parameters = new_parameters
end
def body
return @body
end
def body=(new_body)
if new_body.respond_to?(:each)
@body = new_body
else
raise TypeError, "Expected body to respond to :each."
end
end
def merged_body
return (self.body.inject(StringIO.new) do |accu, chunk|
accu.write(chunk)
accu
end).string
end
def merged_body=(new_merged_body)
if new_merged_body.respond_to?(:string)
new_merged_body = new_merged_body.string
elsif new_merged_body.respond_to?(:to_str)
new_merged_body = new_merged_body.to_str
else
raise TypeError,
"Expected String or StringIO, got #{new_merged_body.class}."
end
self.body = [new_merged_body]
end
def headers
return @headers ||= []
end
def headers=(new_headers)
if new_headers.kind_of?(Array) || new_headers.kind_of?(Hash)
@headers = new_headers
else
raise TypeError, "Expected Hash or Array, got #{new_headers.class}."
end
end
def http_method
return @http_method ||= self.api_method.http_method
end
def http_method=(new_http_method)
if new_http_method.kind_of?(Symbol)
@http_method = new_http_method.to_s.upcase
elsif new_http_method.respond_to?(:to_str)
@http_method = new_http_method.to_str.upcase
else
raise TypeError,
"Expected String or Symbol, got #{new_http_method.class}."
end
end
def uri
return @uri ||= self.api_method.generate_uri(self.parameters)
end
def uri=(new_uri)
@uri = Addressable::URI.parse(new_uri)
end
def to_request
if self.api_method
return self.api_method.generate_request(
self.parameters, self.merged_body, self.headers
)
else
return [self.http_method, self.uri, self.headers, self.body]
end
end
def to_hash
options = {}
if self.api_method
options[:api_method] = self.api_method
options[:parameters] = self.parameters
else
options[:http_method] = self.http_method
options[:uri] = self.uri
end
options[:headers] = self.headers
options[:body] = self.body
return options
end
end
end
end