Class: PhusionPassenger::AnalyticsLogger

Inherits:
Object
  • Object
show all
Includes:
Utils
Defined in:
lib/phusion_passenger/analytics_logger.rb

Defined Under Namespace

Classes: Connection, Lock, Log

Constant Summary collapse

RETRY_SLEEP = 
0.2
NETWORK_ERRORS = 
[Errno::EPIPE, Errno::ECONNREFUSED, Errno::ECONNRESET,
Errno::EHOSTUNREACH, Errno::ENETDOWN, Errno::ENETUNREACH, Errno::ETIMEDOUT]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Utils

process_is_alive?

Constructor Details

#initialize(logging_agent_address, username, password, node_name) ⇒ AnalyticsLogger

Returns a new instance of AnalyticsLogger.



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# File 'lib/phusion_passenger/analytics_logger.rb', line 179

def initialize(logging_agent_address, username, password, node_name)
	@server_address = logging_agent_address
	@username = username
	@password = password
	if node_name && !node_name.empty?
		@node_name = node_name
	else
		@node_name = `hostname`.strip
	end
	@random_dev = File.open("/dev/urandom")
	
	# This mutex protects the following instance variables, but
	# not the contents of @connection.
	@mutex = Mutex.new
	
	@connection = Connection.new(nil)
	if @server_address && local_socket_address?(@server_address)
		@max_connect_tries = 10
	else
		@max_connect_tries = 1
	end
	@reconnect_timeout = 1
	@next_reconnect_time = Time.utc(1980, 1, 1)
end

Instance Attribute Details

#max_connect_tries ⇒ Object

Returns the value of attribute max_connect_tries.



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# File 'lib/phusion_passenger/analytics_logger.rb', line 176

def max_connect_tries
  @max_connect_tries
end

#reconnect_timeout ⇒ Object

Returns the value of attribute reconnect_timeout.



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# File 'lib/phusion_passenger/analytics_logger.rb', line 177

def reconnect_timeout
  @reconnect_timeout
end

Class Method Details

.new_from_options(options) ⇒ Object 



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# File 'lib/phusion_passenger/analytics_logger.rb', line 165

def self.new_from_options(options)
	if options["analytics"] && options["logging_agent_address"]
		return new(options["logging_agent_address"],
			options["logging_agent_username"],
			options["logging_agent_password_base64"].unpack('m').first,
			options["node_name"])
	else
		return nil
	end
end

Instance Method Details

#clear_connection ⇒ Object 



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# File 'lib/phusion_passenger/analytics_logger.rb', line 204

def clear_connection
	@mutex.synchronize do
		@connection.synchronize do
			@random_dev = File.open("/dev/urandom") if @random_dev.closed?
			@connection.unref
			@connection = Connection.new(nil)
		end
	end
end

#close ⇒ Object 



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# File 'lib/phusion_passenger/analytics_logger.rb', line 214

def close
	@mutex.synchronize do
		@connection.synchronize do
			@random_dev.close
			@connection.unref
			@connection = nil
		end
	end
end

#continue_transaction(txn_id, group_name, category = :requests, union_station_key = nil) ⇒ Object 



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# File 'lib/phusion_passenger/analytics_logger.rb', line 283

def continue_transaction(txn_id, group_name, category = :requests, union_station_key = nil)
	if !@server_address
		return Log.new
	elsif !txn_id || txn_id.empty?
		raise ArgumentError, "Transaction ID may not be empty"
	end
	
	Lock.new(@mutex).synchronize do |lock|
		if current_time < @next_reconnect_time
			return Log.new
		end
		
		Lock.new(@connection.mutex).synchronize do |connection_lock|
			if !@connection.connected?
				begin
					connect
					connection_lock.reset(@connection.mutex)
				rescue SystemCallError, IOError
					@connection.disconnect
					DebugLogging.warn("Cannot connect to the logging agent at #{@server_address}; " +
						"retrying in #{@reconnect_timeout} second(s).")
					@next_reconnect_time = current_time + @reconnect_timeout
					return Log.new
				rescue Exception => e
					@connection.disconnect
					raise e
				end
			end
			
			begin
				@connection.channel.write("openTransaction",
					txn_id, group_name, "", category,
					AnalyticsLogger.timestamp_string,
					union_station_key,
					true)
				return Log.new(@connection, txn_id)
			rescue SystemCallError, IOError
				@connection.disconnect
				DebugLogging.warn("The logging agent at #{@server_address}" <<
					" closed the connection; will reconnect in " <<
					"#{@reconnect_timeout} second(s).")
				@next_reconnect_time = current_time + @reconnect_timeout
				return Log.new
			rescue Exception => e
				@connection.disconnect
				raise e
			end
		end
	end
end

#new_transaction(group_name, category = :requests, union_station_key = nil) ⇒ Object 



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# File 'lib/phusion_passenger/analytics_logger.rb', line 224

def new_transaction(group_name, category = :requests, union_station_key = nil)
	if !@server_address
		return Log.new
	elsif !group_name || group_name.empty?
		raise ArgumentError, "Group name may not be empty"
	end
	
	txn_id = (AnalyticsLogger.current_time.to_i / 60).to_s(36)
	txn_id << "-#{random_token(11)}"
	
	Lock.new(@mutex).synchronize do |lock|
		if current_time < @next_reconnect_time
			return Log.new
		end
		
		Lock.new(@connection.mutex).synchronize do |connection_lock|
			if !@connection.connected?
				begin
					connect
					connection_lock.reset(@connection.mutex)
				rescue SystemCallError, IOError
					@connection.disconnect
					DebugLogging.warn("Cannot connect to the logging agent at #{@server_address}; " +
						"retrying in #{@reconnect_timeout} second(s).")
					@next_reconnect_time = current_time + @reconnect_timeout
					return Log.new
				rescue Exception => e
					@connection.disconnect
					raise e
				end
			end
			
			begin
				@connection.channel.write("openTransaction",
					txn_id, group_name, "", category,
					AnalyticsLogger.timestamp_string,
					union_station_key,
					true,
					true)
				result = @connection.channel.read
				if result != ["ok"]
					raise "Expected logging server to respond with 'ok', but got #{result.inspect} instead"
				end
				return Log.new(@connection, txn_id)
			rescue SystemCallError, IOError
				@connection.disconnect
				DebugLogging.warn("The logging agent at #{@server_address}" <<
					" closed the connection; will reconnect in " <<
					"#{@reconnect_timeout} second(s).")
				@next_reconnect_time = current_time + @reconnect_timeout
				return Log.new
			rescue Exception => e
				@connection.disconnect
				raise e
			end
		end
	end
end