Separate GRPC channels per repository storage

config/initializers/1_settings.rb

@@ -440,7 +440,7 @@ Settings.rack_attack.git_basic_auth['bantime'] ||= 1.hour
 # Gitaly
 #
 Settings['gitaly'] ||= Settingslogic.new({})
-Settings.gitaly['socket_path'] ||= ENV['GITALY_SOCKET_PATH']
+Settings.gitaly['enabled'] ||= false
 #
 # Webpack settings

config/initializers/8_gitaly.rb

 # Make sure we initialize a Gitaly channel before Sidekiq starts multi-threaded execution.
-Gitlab::GitalyClient.channel unless Rails.env.test?
+Gitlab.config.repositories.storages.each do |name, params|
+  Gitlab::GitalyClient.configure_channel(name, params['socket_path'])
+end

lib/api/internal.rb

@@ -139,7 +139,7 @@ module API
         return unless Gitlab::GitalyClient.enabled?
         begin
-          Gitlab::GitalyClient::Notifications.new.post_receive(params[:repo_path])
+          Gitlab::GitalyClient::Notifications.new(params[:repo_path]).post_receive
         rescue GRPC::Unavailable => e
           render_api_error(e, 500)
         end

lib/gitlab/gitaly_client.rb

@@ -4,28 +4,24 @@ module Gitlab
   module GitalyClient
     SERVER_VERSION_FILE = 'GITALY_SERVER_VERSION'.freeze
-    def self.gitaly_address
-      if Gitlab.config.gitaly.socket_path
-        "unix://#{Gitlab.config.gitaly.socket_path}"
-      end
+    def self.configure_channel(shard, socket_path)
+      @channel ||= {}
+      @channel[shard] = new_channel("unix://#{socket_path}")
+    end
+
+    def self.new_channel(address)
+      # NOTE: Gitaly currently runs on a Unix socket, so permissions are
+      # handled using the file system and no additional authentication is
+      # required (therefore the :this_channel_is_insecure flag)
+      GRPC::Core::Channel.new(address, {}, :this_channel_is_insecure)
     end
-    def self.channel
-      return @channel if defined?(@channel)
-
-      @channel =
-        if enabled?
-          # NOTE: Gitaly currently runs on a Unix socket, so permissions are
-          # handled using the file system and no additional authentication is
-          # required (therefore the :this_channel_is_insecure flag)
-          GRPC::Core::Channel.new(gitaly_address, {}, :this_channel_is_insecure)
-        else
-          nil
-        end
+    def self.get_channel(shard)
+      @channel.fetch(shard)
     end
     def self.enabled?
-      gitaly_address.present?
+      Gitlab.config.gitaly.enabled
     end
     def self.feature_enabled?(feature)

lib/gitlab/gitaly_client/commit.rb

@@ -7,8 +7,10 @@ module Gitlab
       class << self
         def diff_from_parent(commit, options = {})
-          stub      = Gitaly::Diff::Stub.new(nil, nil, channel_override: GitalyClient.channel)
-          repo      = Gitaly::Repository.new(path: commit.project.repository.path_to_repo)
+          project   = commit.project
+          channel   = GitalyClient.get_channel(project.repository_storage)
+          stub      = Gitaly::Diff::Stub.new(nil, nil, channel_override: channel)
+          repo      = Gitaly::Repository.new(path: project.repository.path_to_repo)
           parent    = commit.parents[0]
           parent_id = parent ? parent.id : EMPTY_TREE_ID
           request   = Gitaly::CommitDiffRequest.new(

lib/gitlab/gitaly_client/notifications.rb

@@ -3,14 +3,19 @@ module Gitlab
     class Notifications
       attr_accessor :stub
-      def initialize
-        @stub = Gitaly::Notifications::Stub.new(nil, nil, channel_override: GitalyClient.channel)
+      def initialize(repo_path)
+        full_path = Gitlab::RepoPath.strip_storage_path(repo_path).
+          sub(/\.git\z/, '').sub(/\.wiki\z/, '')
+        @project = Project.find_by_full_path(full_path)
+
+        channel = GitalyClient.get_channel(@project.repository_storage)
+        @stub = Gitaly::Notifications::Stub.new(nil, nil, channel_override: channel)
       end
-      def post_receive(repo_path)
-        repository = Gitaly::Repository.new(path: repo_path)
+      def post_receive
+        repository = Gitaly::Repository.new(path: @project.repository.path_to_repo)
         request = Gitaly::PostReceiveRequest.new(repository: repository)
-        stub.post_receive(request)
+        @stub.post_receive(request)
       end
     end
   end

spec/lib/gitlab/gitaly_client/notifications_spec.rb

 require 'spec_helper'
 describe Gitlab::GitalyClient::Notifications do
-  let(:client) { Gitlab::GitalyClient::Notifications.new }
-
-  before do
-    allow(Gitlab.config.gitaly).to receive(:socket_path).and_return('path/to/gitaly.socket')
-  end
-
   describe '#post_receive' do
-    let(:repo_path) { '/path/to/my_repo.git' }
-
     it 'sends a post_receive message' do
+      repo_path = create(:empty_project).repository.path_to_repo
       expect_any_instance_of(Gitaly::Notifications::Stub).
         to receive(:post_receive).with(post_receive_request_with_repo_path(repo_path))
-      client.post_receive(repo_path)
+      described_class.new(repo_path).post_receive
     end
   end
 end

spec/requests/api/internal_spec.rb

@@ -429,7 +429,7 @@ describe API::Internal, api: true  do
     it "calls the Gitaly client if it's enabled" do
       expect_any_instance_of(Gitlab::GitalyClient::Notifications).
-        to receive(:post_receive).with(project.repository.path)
+        to receive(:post_receive)
       post api("/internal/notify_post_receive"), valid_params
@@ -438,7 +438,7 @@ describe API::Internal, api: true  do
     it "returns 500 if the gitaly call fails" do
       expect_any_instance_of(Gitlab::GitalyClient::Notifications).
-        to receive(:post_receive).with(project.repository.path).and_raise(GRPC::Unavailable)
+        to receive(:post_receive).and_raise(GRPC::Unavailable)
       post api("/internal/notify_post_receive"), valid_params