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dispatchers.py
import errno from supervisor.medusa.asynchat_25 import find_prefix_at_end from supervisor.medusa.asyncore_25 import compact_traceback from supervisor.compat import as_string from supervisor.events import notify from supervisor.events import EventRejectedEvent from supervisor.events import ProcessLogStderrEvent from supervisor.events import ProcessLogStdoutEvent from supervisor.states import EventListenerStates from supervisor.states import getEventListenerStateDescription from supervisor import loggers class PDispatcher: """ Asyncore dispatcher for mainloop, representing a process channel (stdin, stdout, or stderr). This class is abstract. """ closed = False # True if close() has been called def __init__(self, process, channel, fd): self.process = process # process which "owns" this dispatcher self.channel = channel # 'stderr' or 'stdout' self.fd = fd self.closed = False # True if close() has been called def __repr__(self): return '<%s at %s for %s (%s)>' % (self.__class__.__name__, id(self), self.process, self.channel) def readable(self): raise NotImplementedError def writable(self): raise NotImplementedError def handle_read_event(self): raise NotImplementedError def handle_write_event(self): raise NotImplementedError def handle_error(self): nil, t, v, tbinfo = compact_traceback() self.process.config.options.logger.critical( 'uncaptured python exception, closing channel %s (%s:%s %s)' % ( repr(self), t, v, tbinfo ) ) self.close() def close(self): if not self.closed: self.process.config.options.logger.debug( 'fd %s closed, stopped monitoring %s' % (self.fd, self)) self.closed = True def flush(self): pass class POutputDispatcher(PDispatcher): """ Dispatcher for one channel (stdout or stderr) of one process. Serves several purposes: - capture output sent within <!--XSUPERVISOR:BEGIN--> and <!--XSUPERVISOR:END--> tags and signal a ProcessCommunicationEvent by calling notify(event). - route the output to the appropriate log handlers as specified in the config. """ childlog = None # the current logger (normallog or capturelog) normallog = None # the "normal" (non-capture) logger capturelog = None # the logger used while we're in capturemode capturemode = False # are we capturing process event data output_buffer = b'' # data waiting to be logged def __init__(self, process, event_type, fd): """ Initialize the dispatcher. `event_type` should be one of ProcessLogStdoutEvent or ProcessLogStderrEvent """ self.process = process self.event_type = event_type self.fd = fd self.channel = self.event_type.channel self._init_normallog() self._init_capturelog() self.childlog = self.normallog # all code below is purely for minor speedups begintoken = self.event_type.BEGIN_TOKEN endtoken = self.event_type.END_TOKEN self.begintoken_data = (begintoken, len(begintoken)) self.endtoken_data = (endtoken, len(endtoken)) self.mainlog_level = loggers.LevelsByName.DEBG config = self.process.config self.log_to_mainlog = config.options.loglevel <= self.mainlog_level self.stdout_events_enabled = config.stdout_events_enabled self.stderr_events_enabled = config.stderr_events_enabled def _init_normallog(self): """ Configure the "normal" (non-capture) log for this channel of this process. Sets self.normallog if logging is enabled. """ config = self.process.config channel = self.channel logfile = getattr(config, '%s_logfile' % channel) maxbytes = getattr(config, '%s_logfile_maxbytes' % channel) backups = getattr(config, '%s_logfile_backups' % channel) to_syslog = getattr(config, '%s_syslog' % channel) if logfile or to_syslog: self.normallog = config.options.getLogger() if logfile: loggers.handle_file( self.normallog, filename=logfile, fmt='%(message)s', rotating=not not maxbytes, # optimization maxbytes=maxbytes, backups=backups ) if to_syslog: loggers.handle_syslog( self.normallog, fmt=config.name + ' %(message)s' ) def _init_capturelog(self): """ Configure the capture log for this process. This log is used to temporarily capture output when special output is detected. Sets self.capturelog if capturing is enabled. """ capture_maxbytes = getattr(self.process.config, '%s_capture_maxbytes' % self.channel) if capture_maxbytes: self.capturelog = self.process.config.options.getLogger() loggers.handle_boundIO( self.capturelog, fmt='%(message)s', maxbytes=capture_maxbytes, ) def removelogs(self): for log in (self.normallog, self.capturelog): if log is not None: for handler in log.handlers: handler.remove() handler.reopen() def reopenlogs(self): for log in (self.normallog, self.capturelog): if log is not None: for handler in log.handlers: handler.reopen() def _log(self, data): if data: config = self.process.config if config.options.strip_ansi: data = stripEscapes(data) if self.childlog: self.childlog.info(data) if self.log_to_mainlog: if not isinstance(data, bytes): text = data else: try: text = data.decode('utf-8') except UnicodeDecodeError: text = 'Undecodable: %r' % data msg = '%(name)r %(channel)s output:\n%(data)s' config.options.logger.log( self.mainlog_level, msg, name=config.name, channel=self.channel, data=text) if self.channel == 'stdout': if self.stdout_events_enabled: notify( ProcessLogStdoutEvent(self.process, self.process.pid, data) ) else: # channel == stderr if self.stderr_events_enabled: notify( ProcessLogStderrEvent(self.process, self.process.pid, data) ) def record_output(self): if self.capturelog is None: # shortcut trying to find capture data data = self.output_buffer self.output_buffer = b'' self._log(data) return if self.capturemode: token, tokenlen = self.endtoken_data else: token, tokenlen = self.begintoken_data if len(self.output_buffer) <= tokenlen: return # not enough data data = self.output_buffer self.output_buffer = b'' try: before, after = data.split(token, 1) except ValueError: after = None index = find_prefix_at_end(data, token) if index: self.output_buffer = self.output_buffer + data[-index:] data = data[:-index] self._log(data) else: self._log(before) self.toggle_capturemode() self.output_buffer = after if after: self.record_output() def toggle_capturemode(self): self.capturemode = not self.capturemode if self.capturelog is not None: if self.capturemode: self.childlog = self.capturelog else: for handler in self.capturelog.handlers: handler.flush() data = self.capturelog.getvalue() channel = self.channel procname = self.process.config.name event = self.event_type(self.process, self.process.pid, data) notify(event) msg = "%(procname)r %(channel)s emitted a comm event" self.process.config.options.logger.debug(msg, procname=procname, channel=channel) for handler in self.capturelog.handlers: handler.remove() handler.reopen() self.childlog = self.normallog def writable(self): return False def readable(self): if self.closed: return False return True def handle_read_event(self): data = self.process.config.options.readfd(self.fd) self.output_buffer += data self.record_output() if not data: # if we get no data back from the pipe, it means that the # child process has ended. See # mail.python.org/pipermail/python-dev/2004-August/046850.html self.close() class PEventListenerDispatcher(PDispatcher): """ An output dispatcher that monitors and changes a process' listener_state """ childlog = None # the logger state_buffer = b'' # data waiting to be reviewed for state changes READY_FOR_EVENTS_TOKEN = b'READY\n' RESULT_TOKEN_START = b'RESULT ' READY_FOR_EVENTS_LEN = len(READY_FOR_EVENTS_TOKEN) RESULT_TOKEN_START_LEN = len(RESULT_TOKEN_START) def __init__(self, process, channel, fd): PDispatcher.__init__(self, process, channel, fd) # the initial state of our listener is ACKNOWLEDGED; this is a # "busy" state that implies we're awaiting a READY_FOR_EVENTS_TOKEN self.process.listener_state = EventListenerStates.ACKNOWLEDGED self.process.event = None self.result = b'' self.resultlen = None logfile = getattr(process.config, '%s_logfile' % channel) if logfile: maxbytes = getattr(process.config, '%s_logfile_maxbytes' % channel) backups = getattr(process.config, '%s_logfile_backups' % channel) self.childlog = process.config.options.getLogger() loggers.handle_file( self.childlog, logfile, '%(message)s', rotating=not not maxbytes, # optimization maxbytes=maxbytes, backups=backups, ) def removelogs(self): if self.childlog is not None: for handler in self.childlog.handlers: handler.remove() handler.reopen() def reopenlogs(self): if self.childlog is not None: for handler in self.childlog.handlers: handler.reopen() def writable(self): return False def readable(self): if self.closed: return False return True def handle_read_event(self): data = self.process.config.options.readfd(self.fd) if data: self.state_buffer += data procname = self.process.config.name msg = '%r %s output:\n%s' % (procname, self.channel, data) self.process.config.options.logger.debug(msg) if self.childlog: if self.process.config.options.strip_ansi: data = stripEscapes(data) self.childlog.info(data) else: # if we get no data back from the pipe, it means that the # child process has ended. See # mail.python.org/pipermail/python-dev/2004-August/046850.html self.close() self.handle_listener_state_change() def handle_listener_state_change(self): data = self.state_buffer if not data: return process = self.process procname = process.config.name state = process.listener_state if state == EventListenerStates.UNKNOWN: # this is a fatal state self.state_buffer = b'' return if state == EventListenerStates.ACKNOWLEDGED: if len(data) < self.READY_FOR_EVENTS_LEN: # not enough info to make a decision return elif data.startswith(self.READY_FOR_EVENTS_TOKEN): self._change_listener_state(EventListenerStates.READY) tokenlen = self.READY_FOR_EVENTS_LEN self.state_buffer = self.state_buffer[tokenlen:] process.event = None else: self._change_listener_state(EventListenerStates.UNKNOWN) self.state_buffer = b'' process.event = None if self.state_buffer: # keep going til its too short self.handle_listener_state_change() else: return elif state == EventListenerStates.READY: # the process sent some spurious data, be strict about it self._change_listener_state(EventListenerStates.UNKNOWN) self.state_buffer = b'' process.event = None return elif state == EventListenerStates.BUSY: if self.resultlen is None: # we haven't begun gathering result data yet pos = data.find(b'\n') if pos == -1: # we can't make a determination yet, we dont have a full # results line return result_line = self.state_buffer[:pos] self.state_buffer = self.state_buffer[pos+1:] # rid LF resultlen = result_line[self.RESULT_TOKEN_START_LEN:] try: self.resultlen = int(resultlen) except ValueError: try: result_line = as_string(result_line) except UnicodeDecodeError: result_line = 'Undecodable: %r' % result_line process.config.options.logger.warn( '%s: bad result line: \'%s\'' % (procname, result_line) ) self._change_listener_state(EventListenerStates.UNKNOWN) self.state_buffer = b'' notify(EventRejectedEvent(process, process.event)) process.event = None return else: needed = self.resultlen - len(self.result) if needed: self.result += self.state_buffer[:needed] self.state_buffer = self.state_buffer[needed:] needed = self.resultlen - len(self.result) if not needed: self.handle_result(self.result) self.process.event = None self.result = b'' self.resultlen = None if self.state_buffer: # keep going til its too short self.handle_listener_state_change() def handle_result(self, result): process = self.process procname = process.config.name logger = process.config.options.logger try: self.process.group.config.result_handler(process.event, result) logger.debug('%s: event was processed' % procname) self._change_listener_state(EventListenerStates.ACKNOWLEDGED) except RejectEvent: logger.warn('%s: event was rejected' % procname) self._change_listener_state(EventListenerStates.ACKNOWLEDGED) notify(EventRejectedEvent(process, process.event)) except: logger.warn('%s: event caused an error' % procname) self._change_listener_state(EventListenerStates.UNKNOWN) notify(EventRejectedEvent(process, process.event)) def _change_listener_state(self, new_state): process = self.process procname = process.config.name old_state = process.listener_state msg = '%s: %s -> %s' % ( procname, getEventListenerStateDescription(old_state), getEventListenerStateDescription(new_state) ) process.config.options.logger.debug(msg) process.listener_state = new_state if new_state == EventListenerStates.UNKNOWN: msg = ('%s: has entered the UNKNOWN state and will no longer ' 'receive events, this usually indicates the process ' 'violated the eventlistener protocol' % procname) process.config.options.logger.warn(msg) class PInputDispatcher(PDispatcher): """ Input (stdin) dispatcher """ def __init__(self, process, channel, fd): PDispatcher.__init__(self, process, channel, fd) self.input_buffer = b'' def writable(self): if self.input_buffer and not self.closed: return True return False def readable(self): return False def flush(self): # other code depends on this raising EPIPE if the pipe is closed sent = self.process.config.options.write(self.fd, self.input_buffer) self.input_buffer = self.input_buffer[sent:] def handle_write_event(self): if self.input_buffer: try: self.flush() except OSError as why: if why.args[0] == errno.EPIPE: self.input_buffer = b'' self.close() else: raise ANSI_ESCAPE_BEGIN = b'\x1b[' ANSI_TERMINATORS = (b'H', b'f', b'A', b'B', b'C', b'D', b'R', b's', b'u', b'J', b'K', b'h', b'l', b'p', b'm') def stripEscapes(s): """ Remove all ANSI color escapes from the given string. """ result = b'' show = 1 i = 0 L = len(s) while i < L: if show == 0 and s[i:i + 1] in ANSI_TERMINATORS: show = 1 elif show: n = s.find(ANSI_ESCAPE_BEGIN, i) if n == -1: return result + s[i:] else: result = result + s[i:n] i = n show = 0 i += 1 return result class RejectEvent(Exception): """ The exception type expected by a dispatcher when a handler wants to reject an event """ def default_handler(event, response): if response != b'OK': raise RejectEvent(response)
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