revert: setting idempotency header (googleapis#23588)

This reverts commit 0f5a074 (pull request googleapis#22517).

There are several issues with the original change, notably that it sets the invocation ID as a constant, meaning ALL calls from the same Ruby VM will always use the same invocation ID. This will likely confuse any consumer of this value. (Indeed, some basic integration tests run against that code yielded weird results.)

Author: dazuma

google-apis-core/lib/google/apis/core/api_command.rb

@@ -18,6 +18,7 @@
 require 'google/apis/errors'
 require 'json'
 require 'retriable'
+require "securerandom"
 
 module Google
   module Apis
@@ -69,7 +70,6 @@ def initialize(method, url, body: nil, client_version: nil)
         def prepare!
           set_api_client_header
           set_user_project_header
-          set_idempotency_token_header 
           if options&.api_format_version
             header['X-Goog-Api-Format-Version'] = options.api_format_version.to_s
           end
@@ -143,7 +143,6 @@ def allow_form_encoding?
         end
 
         private
-        INVOCATION_ID = SecureRandom.uuid
 
         def set_api_client_header
           old_xgac = header
@@ -175,12 +174,8 @@ def set_user_project_header
           header['X-Goog-User-Project'] = quota_project_id if quota_project_id
         end
 
-        def set_idempotency_token_header
-          header['X-Goog-Gcs-Idempotency-Token'] = INVOCATION_ID
-        end
-
         def invocation_id_header
-          "gccl-invocation-id/#{INVOCATION_ID}"
+          "gccl-invocation-id/#{SecureRandom.uuid}"
         end
 
         # Attempt to parse a JSON error message

google-apis-core/spec/google/apis/core/api_command_spec.rb

@@ -34,15 +34,11 @@
 
   let(:client_version) { "1.2.3" }
   let(:x_goog_api_client_value) { "gl-ruby/#{RUBY_VERSION} gdcl/#{client_version}" }
+
   context('with preparation') do
     let(:command) do
       Google::Apis::Core::ApiCommand.new(:get, 'https://www.googleapis.com/zoo/animals', client_version: client_version)
     end
-    let(:invocation_id) { 'test123' }
-
-    before(:example) do
-      Google::Apis::Core::ApiCommand.const_set(:INVOCATION_ID, invocation_id)
-    end
 
     it 'should set X-Goog-Api-Client header if none is set' do
       command.prepare!
@@ -93,14 +89,6 @@
       command.options.add_invocation_id_header = true
       command.prepare!
       expect(command.header["X-Goog-Api-Client"]).to include("gccl-invocation-id")
-      expect(command.header["X-Goog-Api-Client"]).to include(invocation_id)
-
-    end
-
-    it "should set the X-Goog-Gcs-Idempotency-Token header" do
-      command.prepare!
-      expect(command.header['X-Goog-Gcs-Idempotency-Token']).not_to be_nil
-      expect(command.header['X-Goog-Gcs-Idempotency-Token']).to eql invocation_id
     end
   end
 
@@ -262,18 +250,11 @@
       command.options.add_invocation_id_header = true
       result = command.execute(client)
       invocation_id_header = command.header["X-Goog-Api-Client"]
+      
       expect(invocation_id_header).to include("gccl-invocation-id")
       expect(a_request(:get, 'https://www.googleapis.com/zoo/animals')
         .with { |req| req.headers['X-Goog-Api-Client'] == invocation_id_header }).to have_been_made.times(2)
     end
-
-    it 'should keep same idempotency_token across retries' do
-      result = command.execute(client)
-      idempotency_token_header = command.header['X-Goog-Gcs-Idempotency-Token']
-      expect(a_request(:get, 'https://www.googleapis.com/zoo/animals')
-        .with { |req| req.headers['X-Goog-Gcs-Idempotency-Token'] == idempotency_token_header })
-        .to have_been_made.times(2)
-    end
   end
 
   context('with a project not linked response') do

google-apis-core/spec/google/apis/core/service_spec.rb

@@ -25,7 +25,6 @@
   let(:service_ud) { Google::Apis::Core::BaseService.new('https://www.$UNIVERSE_DOMAIN$/', '', client_version: client_version) }
   let(:service_with_base_path) { Google::Apis::Core::BaseService.new('https://www.googleapis.com/', 'my_service/v1/', client_version: client_version) }
   let(:x_goog_api_client_value) { "gl-ruby/#{RUBY_VERSION} gdcl/#{client_version}" }
-  let(:invocation_id) { 'test123' }
 
   before do
     Google::Apis::ClientOptions.default.application_name = 'test'
@@ -375,7 +374,6 @@
 
   context 'with batch uploads' do
     before(:example) do
-      Google::Apis::Core::ApiCommand.const_set(:INVOCATION_ID, invocation_id)
       allow(SecureRandom).to receive(:uuid).and_return('b1981e17-f622-49af-b2eb-203308b1b17d')
       allow(Digest::SHA1).to receive(:hexdigest).and_return('outer', 'inner')
       response = <<EOF.gsub(/\n/, "\r\n")
@@ -432,7 +430,6 @@
 
 POST /upload/zoo/animals\\? HTTP/1\\.1
 X-Goog-Api-Client: #{Regexp.escape(x_goog_api_client_value)}
-X-Goog-Gcs-Idempotency-Token: #{invocation_id}
 Content-Type: multipart/related; boundary=inner
 X-Goog-Upload-Protocol: multipart
 Authorization: Bearer a token