class Redis::Client::Connector::Sentinel

Public Class Methods

new(options) click to toggle source
Calls superclass method Redis::Client::Connector.new
# File lib/redis/client.rb, line 488
def initialize(options)
  super(options)

  @options[:password] = DEFAULTS.fetch(:password)
  @options[:db] = DEFAULTS.fetch(:db)

  @sentinels = @options.delete(:sentinels).dup
  @role = @options.fetch(:role, "master").to_s
  @master = @options[:host]
end

Public Instance Methods

check(client) click to toggle source
# File lib/redis/client.rb, line 499
def check(client)
  # Check the instance is really of the role we are looking for.
  # We can't assume the command is supported since it was introduced
  # recently and this client should work with old stuff.
  begin
    role = client.call([:role])[0]
  rescue Redis::CommandError
    # Assume the test is passed if we can't get a reply from ROLE...
    role = @role
  end

  if role != @role
    client.disconnect
    raise ConnectionError, "Instance role mismatch. Expected #{@role}, got #{role}."
  end
end
resolve() click to toggle source
# File lib/redis/client.rb, line 516
def resolve
  result = case @role
           when "master"
             resolve_master
           when "slave"
             resolve_slave
           else
             raise ArgumentError, "Unknown instance role #{@role}"
           end

  result || (raise ConnectionError, "Unable to fetch #{@role} via Sentinel.")
end
resolve_master() click to toggle source
# File lib/redis/client.rb, line 554
def resolve_master
  sentinel_detect do |client|
    if reply = client.call(["sentinel", "get-master-addr-by-name", @master])
      {:host => reply[0], :port => reply[1]}
    end
  end
end
resolve_slave() click to toggle source
# File lib/redis/client.rb, line 562
def resolve_slave
  sentinel_detect do |client|
    if reply = client.call(["sentinel", "slaves", @master])
      slave = Hash[*reply.sample]

      {:host => slave.fetch("ip"), :port => slave.fetch("port")}
    end
  end
end
sentinel_detect() { |client| ... } click to toggle source
# File lib/redis/client.rb, line 529
def sentinel_detect
  @sentinels.each do |sentinel|
    client = Client.new(@options.merge({
      :host => sentinel[:host],
      :port => sentinel[:port],
      :reconnect_attempts => 0,
    }))

    begin
      if result = yield(client)
        # This sentinel responded. Make sure we ask it first next time.
        @sentinels.delete(sentinel)
        @sentinels.unshift(sentinel)

        return result
      end
    rescue BaseConnectionError
    ensure
      client.disconnect
    end
  end

  raise CannotConnectError, "No sentinels available."
end