<s> """<STR_LIT>""" <EOL> import re <EOL> import time <EOL> import fnmatch <EOL> from zope . interface import implements <EOL> from twisted . application . internet import UDPServer <EOL> from twisted . application . service import Service <EOL> from twisted . internet import interfaces <EOL> from twisted . internet . protocol import ( <EOL> ReconnectingClientFactory , Protocol ) <EOL> from twisted . internet import defer <EOL> from twisted . python import log <EOL> from txstatsd . server . processor import BaseMessageProcessor <EOL> from txstatsd . client import StatsDClientProtocol , TwistedStatsDClient <EOL> class StopProcessingException ( Exception ) : <EOL> pass <EOL> class TCPRedirectService ( Service ) : <EOL> def __init__ ( self , host , port , factory ) : <EOL> self . host = host <EOL> self . port = port <EOL> self . factory = factory <EOL> def startService ( self ) : <EOL> from twisted . internet import reactor <EOL> reactor . connectTCP ( self . host , self . port , self . factory ) <EOL> return Service . startService ( self ) <EOL> def stopService ( self ) : <EOL> self . factory . stopTrying ( ) <EOL> if self . factory . protocol : <EOL> self . factory . protocol . transport . loseConnection ( ) <EOL> return Service . stopService ( self ) <EOL> class TCPRedirectClientFactory ( ReconnectingClientFactory ) : <EOL> def __init__ ( self , callback = None ) : <EOL> self . callback = callback <EOL> self . protocol = None <EOL> def buildProtocol ( self , addr ) : <EOL> from twisted . internet import reactor <EOL> self . resetDelay ( ) <EOL> self . protocol = TCPRedirectProtocol ( ) <EOL> if self . callback : <EOL> reactor . callLater ( <NUM_LIT:0> , self . callback ) <EOL> self . callback = None <EOL> return self . protocol <EOL> def write ( self , data ) : <EOL> if self . protocol : <EOL> self . protocol . write ( data ) <EOL> class TCPRedirectProtocol ( Protocol ) : <EOL> """<STR_LIT>""" <EOL> implements ( interfaces . IPushProducer ) <EOL> def __init__ ( self ) : <EOL> self . paused = False <EOL> self . last_paused = None <EOL> self . dropped = <NUM_LIT:0> <EOL> def connectionMade ( self ) : <EOL> """<STR_LIT>""" <EOL> self . transport . registerProducer ( self , True ) <EOL> def pauseProducing ( self ) : <EOL> """<STR_LIT>""" <EOL> self . last_paused = int ( time . time ( ) ) <EOL> self . paused = True <EOL> stopProducing = pauseProducing <EOL> def resumeProducing ( self ) : <EOL> """<STR_LIT>""" <EOL> time_now = int ( time . time ( ) ) <EOL> log ( "<STR_LIT>" <EOL> "<STR_LIT>" , <EOL> self . dropped , time_now - self . last_paused ) <EOL> self . paused = False <EOL> self . dropped = <NUM_LIT:0> <EOL> self . last_paused = None <EOL> def write ( self , line ) : <EOL> if self . paused : <EOL> self . dropped += <NUM_LIT:1> <EOL> return <EOL> if line [ - <NUM_LIT:2> : ] != "<STR_LIT:\r\n>" : <EOL> if line [ - <NUM_LIT:1> ] == "<STR_LIT:\r>" : <EOL> line += "<STR_LIT:\n>" <EOL> else : <EOL> line += "<STR_LIT:\r\n>" <EOL> self . transport . write ( line ) <EOL> class Router ( BaseMessageProcessor ) : <EOL> def __init__ ( self , message_processor , rules_config , service = None ) : <EOL> """<STR_LIT>""" <EOL> self . rules_config = rules_config <EOL> self . message_processor = message_processor <EOL> self . flush = message_processor . flush <EOL> self . ready = defer . succeed ( None ) <EOL> self . service = service <EOL> self . rules = self . build_rules ( rules_config ) <EOL> def build_condition ( self , condition ) : <EOL> condition_parts = [ <EOL> p . strip ( ) for p in condition . split ( "<STR_LIT:U+0020>" ) if p ] <EOL> condition_factory = getattr ( self , <EOL> "<STR_LIT>" + condition_parts [ <NUM_LIT:0> ] , None ) <EOL> if condition_factory is None : <EOL> raise ValueError ( "<STR_LIT>" % <EOL> ( condition_parts [ <NUM_LIT:0> ] , ) ) <EOL> condition_function = condition_factory ( * condition_parts [ <NUM_LIT:1> : ] ) <EOL> return condition_function <EOL> def build_rules ( self , rules_config ) : <EOL> rules = [ ] <EOL> for line in rules_config . split ( "<STR_LIT:\n>" ) : <EOL> if not line : <EOL> continue <EOL> condition , target = line . split ( "<STR_LIT>" ) <EOL> condition_function = self . build_condition ( condition ) <EOL> target_parts = [ <EOL> p . strip ( ) for p in target . split ( "<STR_LIT:U+0020>" ) if p ] <EOL> target_factory = getattr ( self , <EOL> "<STR_LIT>" + target_parts [ <NUM_LIT:0> ] , None ) <EOL> if target_factory is None : <EOL> raise ValueError ( "<STR_LIT>" % <EOL> ( target_parts [ <NUM_LIT:0> ] , ) ) <EOL> rules . append ( ( <EOL> condition_function , <EOL> target_factory ( * target_parts [ <NUM_LIT:1> : ] ) ) ) <EOL> return rules <EOL> def build_condition_any ( self ) : <EOL> """<STR_LIT>""" <EOL> return lambda * args : True <EOL> def build_condition_not ( self , * args ) : <EOL> """<STR_LIT>""" <EOL> other_condition = self . build_condition ( "<STR_LIT:U+0020>" . join ( args ) ) <EOL> def not_condition ( metric_type , key , fields ) : <EOL> return not other_condition ( metric_type , key , fields ) <EOL> return not_condition <EOL> def build_condition_metric_type ( self , * metric_types ) : <EOL> """<STR_LIT>""" <EOL> def metric_type_condition ( metric_type , key , fields ) : <EOL> return ( metric_type in metric_types ) <EOL> return metric_type_condition <EOL> def build_condition_path_like ( self , pattern ) : <EOL> def path_like_condition ( metric_type , key , fields ) : <EOL> return fnmatch . fnmatch ( key , pattern ) <EOL> return path_like_condition <EOL> def build_target_drop ( self ) : <EOL> """<STR_LIT>""" <EOL> def drop ( * args ) : <EOL> return <EOL> return drop <EOL> def build_target_rewrite ( self , pattern , repl , dup = "<STR_LIT>" ) : <EOL> rexp = re . compile ( pattern ) <EOL> def rewrite_target ( metric_type , key , fields ) : <EOL> if dup == "<STR_LIT>" and rexp . match ( key ) is not None : <EOL> yield metric_type , key , fields <EOL> key = rexp . sub ( repl , key ) <EOL> yield metric_type , key , fields <EOL> return rewrite_target <EOL> def build_target_set_metric_type ( self , metric_type , dup = "<STR_LIT>" ) : <EOL> def set_metric_type ( _ , key , fields ) : <EOL> if dup == "<STR_LIT>" : <EOL> yield _ , key , fields <EOL> yield metric_type , key , fields <EOL> return set_metric_type <EOL> def build_target_redirect_udp ( self , host , port ) : <EOL> if self . service is None : <EOL> return lambda * args : True <EOL> port = int ( port ) <EOL> d = defer . Deferred ( ) <EOL> self . ready . addCallback ( lambda _ : d ) <EOL> client = TwistedStatsDClient . create ( <EOL> host , port , connect_callback = lambda : d . callback ( None ) ) <EOL> protocol = StatsDClientProtocol ( client ) <EOL> udp_service = UDPServer ( <NUM_LIT:0> , protocol ) <EOL> udp_service . setServiceParent ( self . service ) <EOL> def redirect_udp_target ( metric_type , key , fields ) : <EOL> message = self . rebuild_message ( metric_type , key , fields ) <EOL> client . write ( message ) <EOL> yield metric_type , key , fields <EOL> return redirect_udp_target <EOL> def build_target_redirect_tcp ( self , host , port ) : <EOL> if self . service is None : <EOL> return lambda * args : True <EOL> port = int ( port ) <EOL> d = defer . Deferred ( ) <EOL> self . ready . addCallback ( lambda _ : d ) <EOL> factory = TCPRedirectClientFactory ( lambda : d . callback ( None ) ) <EOL> redirect_service = TCPRedirectService ( host , port , factory ) <EOL> redirect_service . setServiceParent ( self . service ) <EOL> def redirect_tcp_target ( metric_type , key , fields ) : <EOL> message = self . rebuild_message ( metric_type , key , fields ) <EOL> factory . write ( message ) <EOL> yield metric_type , key , fields <EOL> return redirect_tcp_target <EOL> def process_message ( self , message , metric_type , key , fields ) : <EOL> metrics = [ ( metric_type , key , fields ) ] <EOL> if self . rules : <EOL> for condition , target in self . rules : <EOL> pending , metrics = metrics , [ ] <EOL> if not pending : <EOL> return <EOL> for metric_type , key , fields in pending : <EOL> if not condition ( metric_type , key , fields ) : <EOL> metrics . append ( ( metric_type , key , fields ) ) <EOL> continue <EOL> result = target ( metric_type , key , fields ) <EOL> if result is not None : <EOL> metrics . extend ( result ) <EOL> for ( metric_type , key , fields ) in metrics : <EOL> message = self . rebuild_message ( metric_type , key , fields ) <EOL> self . message_processor . process_message ( message , metric_type , <EOL> key , fields ) </s>
