Add redis-rb as a vendored library

`make update-redis` will clone the library and adjust the paths properly

.gitignore

@@ -8,3 +8,4 @@ coverage/
 .bundle
 tags
 .bundle/
+*.orig

Gemfile

 source "http://rubygems.org"
 
-gem 'redis', '~> 3.3'
-
 group :development, :test do
   gem 'coveralls', require: false
   gem 'rspec', '~> 2.14.0'

Gemfile.lock

@@ -37,7 +37,6 @@ GEM
       method_source (~> 0.8)
       slop (~> 3.3.1)
     rainbow (2.0.0)
-    redis (3.3.0)
     rest-client (1.7.2)
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)
@@ -78,7 +77,6 @@ DEPENDENCIES
   coveralls
   guard
   guard-rspec
-  redis (~> 3.3)
   rspec (~> 2.14.0)
   rubocop (= 0.28.0)
   vcr

Makefile

+REDIS_RB_VERSION=v3.3.0
+REDIS_RB_TMP_DIR := $(shell mktemp -d)
+REDIS_RB_VENDOR_DIR=lib/vendor
+PWD=`pwd`
+
+all:
+
+update-redis:
+	cd lib
+	git clone https://github.com/redis/redis-rb.git $(REDIS_RB_TMP_DIR)
+	cd $(REDIS_RB_TMP_DIR); git checkout $(REDIS_RB_VERSION)
+	cd $(PWD)
+	mkdir -p $(REDIS_RB_VENDOR_DIR)
+	cp -r $(REDIS_RB_TMP_DIR)/lib/* $(REDIS_RB_VENDOR_DIR)
+	# Adjust all 'require redis/' paths to relative paths
+	sed -i.orig -e 's/require "redis/require_relative "redis/g' $(REDIS_RB_VENDOR_DIR)/redis.rb
+	find $(REDIS_RB_VENDOR_DIR)/redis -name \*.rb -maxdepth 1 -exec sed -i.orig -e "s/require \"redis\//require_relative \"/g" {} \;
+	find $(REDIS_RB_VENDOR_DIR)/redis/connection -name \*.rb -maxdepth 1 -exec sed -i.orig -e 's/require "redis\/connection\//require_relative "/g' *.rb {} \;
+	find $(REDIS_RB_VENDOR_DIR)/redis/connection -name \*.rb -maxdepth 1 -exec sed -i.orig -e 's/require "redis\//require_relative "..\//g' *.rb {} \;
+
+.PHONY=update-redis

lib/gitlab_net.rb

 require 'net/http'
 require 'openssl'
 require 'json'
-require 'redis'
 
 require_relative 'gitlab_config'
 require_relative 'gitlab_logger'
 require_relative 'gitlab_access'
 require_relative 'httpunix'
+require_relative 'vendor/redis'
 
 class GitlabNet
   class ApiUnreachableError < StandardError; end

lib/gitlab_post_receive.rb

@@ -2,7 +2,6 @@ require_relative 'gitlab_init'
 require_relative 'gitlab_net'
 require 'json'
 require 'base64'
-require 'redis'
 require 'securerandom'
 
 class GitlabPostReceive

lib/vendor/redis/connection.rb

+require_relative "connection/registry"
+
+# If a connection driver was required before this file, the array
+# Redis::Connection.drivers will contain one or more classes. The last driver
+# in this array will be used as default driver. If this array is empty, we load
+# the plain Ruby driver as our default. Another driver can be required at a
+# later point in time, causing it to be the last element of the #drivers array
+# and therefore be chosen by default.
+require_relative "connection/ruby" if Redis::Connection.drivers.empty?

lib/vendor/redis/connection/command_helper.rb

+class Redis
+  module Connection
+    module CommandHelper
+
+      COMMAND_DELIMITER = "\r\n"
+
+      def build_command(args)
+        command = [nil]
+
+        args.each do |i|
+          if i.is_a? Array
+            i.each do |j|
+              j = j.to_s
+              command << "$#{j.bytesize}"
+              command << j
+            end
+          else
+            i = i.to_s
+            command << "$#{i.bytesize}"
+            command << i
+          end
+        end
+
+        command[0] = "*#{(command.length - 1) / 2}"
+
+        # Trailing delimiter
+        command << ""
+        command.join(COMMAND_DELIMITER)
+      end
+
+    protected
+
+      if defined?(Encoding::default_external)
+        def encode(string)
+          string.force_encoding(Encoding::default_external)
+        end
+      else
+        def encode(string)
+          string
+        end
+      end
+    end
+  end
+end

lib/vendor/redis/connection/hiredis.rb

+require_relative "registry"
+require_relative "../errors"
+require "hiredis/connection"
+require "timeout"
+
+class Redis
+  module Connection
+    class Hiredis
+
+      def self.connect(config)
+        connection = ::Hiredis::Connection.new
+        connect_timeout = (config.fetch(:connect_timeout, 0) * 1_000_000).to_i
+
+        if config[:scheme] == "unix"
+          connection.connect_unix(config[:path], connect_timeout)
+        elsif config[:scheme] == "rediss" || config[:ssl]
+          raise NotImplementedError, "SSL not supported by hiredis driver"
+        else
+          connection.connect(config[:host], config[:port], connect_timeout)
+        end
+
+        instance = new(connection)
+        instance.timeout = config[:read_timeout]
+        instance
+      rescue Errno::ETIMEDOUT
+        raise TimeoutError
+      end
+
+      def initialize(connection)
+        @connection = connection
+      end
+
+      def connected?
+        @connection && @connection.connected?
+      end
+
+      def timeout=(timeout)
+        # Hiredis works with microsecond timeouts
+        @connection.timeout = Integer(timeout * 1_000_000)
+      end
+
+      def disconnect
+        @connection.disconnect
+        @connection = nil
+      end
+
+      def write(command)
+        @connection.write(command.flatten(1))
+      rescue Errno::EAGAIN
+        raise TimeoutError
+      end
+
+      def read
+        reply = @connection.read
+        reply = CommandError.new(reply.message) if reply.is_a?(RuntimeError)
+        reply
+      rescue Errno::EAGAIN
+        raise TimeoutError
+      rescue RuntimeError => err
+        raise ProtocolError.new(err.message)
+      end
+    end
+  end
+end
+
+Redis::Connection.drivers << Redis::Connection::Hiredis

lib/vendor/redis/connection/registry.rb

+class Redis
+  module Connection
+
+    # Store a list of loaded connection drivers in the Connection module.
+    # Redis::Client uses the last required driver by default, and will be aware
+    # of the loaded connection drivers if the user chooses to override the
+    # default connection driver.
+    def self.drivers
+      @drivers ||= []
+    end
+  end
+end

lib/vendor/redis/connection/synchrony.rb

+require_relative "command_helper"
+require_relative "registry"
+require_relative "../errors"
+require "em-synchrony"
+require "hiredis/reader"
+
+class Redis
+  module Connection
+    class RedisClient < EventMachine::Connection
+      include EventMachine::Deferrable
+
+      attr_accessor :timeout
+
+      def post_init
+        @req = nil
+        @connected = false
+        @reader = ::Hiredis::Reader.new
+      end
+
+      def connection_completed
+        @connected = true
+        succeed
+      end
+
+      def connected?
+        @connected
+      end
+
+      def receive_data(data)
+        @reader.feed(data)
+
+        loop do
+          begin
+            reply = @reader.gets
+          rescue RuntimeError => err
+            @req.fail [:error, ProtocolError.new(err.message)]
+            break
+          end
+
+          break if reply == false
+
+          reply = CommandError.new(reply.message) if reply.is_a?(RuntimeError)
+          @req.succeed [:reply, reply]
+        end
+      end
+
+      def read
+        @req = EventMachine::DefaultDeferrable.new
+        if @timeout > 0
+          @req.timeout(@timeout, :timeout)
+        end
+        EventMachine::Synchrony.sync @req
+      end
+
+      def send(data)
+        callback { send_data data }
+      end
+
+      def unbind
+        @connected = false
+        if @req
+          @req.fail [:error, Errno::ECONNRESET]
+          @req = nil
+        else
+          fail
+        end
+      end
+    end
+
+    class Synchrony
+      include Redis::Connection::CommandHelper
+
+      def self.connect(config)
+        if config[:scheme] == "unix"
+          conn = EventMachine.connect_unix_domain(config[:path], RedisClient)
+        elsif config[:scheme] == "rediss" || config[:ssl]
+          raise NotImplementedError, "SSL not supported by synchrony driver"
+        else
+          conn = EventMachine.connect(config[:host], config[:port], RedisClient) do |c|
+            c.pending_connect_timeout = [config[:connect_timeout], 0.1].max
+          end
+        end
+
+        fiber = Fiber.current
+        conn.callback { fiber.resume }
+        conn.errback { fiber.resume :refused }
+
+        raise Errno::ECONNREFUSED if Fiber.yield == :refused
+
+        instance = new(conn)
+        instance.timeout = config[:read_timeout]
+        instance
+      end
+
+      def initialize(connection)
+        @connection = connection
+      end
+
+      def connected?
+        @connection && @connection.connected?
+      end
+
+      def timeout=(timeout)
+        @connection.timeout = timeout
+      end
+
+      def disconnect
+        @connection.close_connection
+        @connection = nil
+      end
+
+      def write(command)
+        @connection.send(build_command(command))
+      end
+
+      def read
+        type, payload = @connection.read
+
+        if type == :reply
+          payload
+        elsif type == :error
+          raise payload
+        elsif type == :timeout
+          raise TimeoutError
+        else
+          raise "Unknown type #{type.inspect}"
+        end
+      end
+    end
+  end
+end
+
+Redis::Connection.drivers << Redis::Connection::Synchrony

lib/vendor/redis/errors.rb

+class Redis
+  # Base error for all redis-rb errors.
+  class BaseError < RuntimeError
+  end
+
+  # Raised by the connection when a protocol error occurs.
+  class ProtocolError < BaseError
+    def initialize(reply_type)
+      super(<<-EOS.gsub(/(?:^|\n)\s*/, " "))
+        Got '#{reply_type}' as initial reply byte.
+        If you're in a forking environment, such as Unicorn, you need to
+        connect to Redis after forking.
+      EOS
+    end
+  end
+
+  # Raised by the client when command execution returns an error reply.
+  class CommandError < BaseError
+  end
+
+  # Base error for connection related errors.
+  class BaseConnectionError < BaseError
+  end
+
+  # Raised when connection to a Redis server cannot be made.
+  class CannotConnectError < BaseConnectionError
+  end
+
+  # Raised when connection to a Redis server is lost.
+  class ConnectionError < BaseConnectionError
+  end
+
+  # Raised when performing I/O times out.
+  class TimeoutError < BaseConnectionError
+  end
+
+  # Raised when the connection was inherited by a child process.
+  class InheritedError < BaseConnectionError
+  end
+end

lib/vendor/redis/version.rb

+class Redis
+  VERSION = "3.3.0"
+end