def request(self, route: str, timeout_seconds: float, headers: dict = None, body: any = None, correlation_id: str = None) -> EventEnvelope: self.util.validate_service_name(route, True) if headers is None and body is None: raise ValueError( 'Unable to make RPC call because both headers and body are missing' ) timeout_value = self.util.get_float(timeout_seconds) if timeout_value <= 0: raise ValueError( "timeout value in seconds must be positive number") event = EventEnvelope().set_to(route) if headers is not None: if not isinstance(headers, dict): raise ValueError('headers must be dict') for h in headers: event.set_header(h, str(headers[h])) if body is not None: event.set_body(body) if correlation_id is not None: event.set_correlation_id(str(correlation_id)) return self.platform.request(event, timeout_seconds)
def request(self, route: str, timeout_seconds: float, headers: dict = None, body: any = None, correlation_id: str = None) -> EventEnvelope: self.util.validate_service_name(route, True) if headers is None and body is None: raise ValueError( 'Unable to make RPC call because both headers and body are missing' ) timeout_value = self.util.get_float(timeout_seconds) if timeout_value <= 0: raise ValueError( 'timeout value in seconds must be positive number') event = EventEnvelope().set_to(route) if headers is not None: if not isinstance(headers, dict): raise ValueError('headers must be dict') for h in headers: event.set_header(h, str(headers[h])) if body is not None: event.set_body(body) if correlation_id is not None: event.set_correlation_id(str(correlation_id)) response = self.platform.request(event, timeout_seconds) if isinstance(response, EventEnvelope): if response.get_tag('exception') is None: return response else: raise AppException(response.get_status(), response.get_body()) raise ValueError( f'Expect response is EventEnvelope, actual: ({response})')
def handle_event(self, event, instance): headers = dict() if 'headers' not in event else event['headers'] body = None if 'body' not in event else event['body'] result = None error_code = None error_msg = None # start distributed tracing if the event contains trace_id and trace_path if 'trace_id' in event and 'trace_path' in event: self.platform.start_tracing(self.route, trace_id=event['trace_id'], trace_path=event['trace_path']) else: self.platform.start_tracing(self.route) # execute user function begin = end = time.time() try: if instance == 0: # service is an interceptor. e.g. inbox for RPC call self.user_function(EventEnvelope().from_map(event)) elif instance == -1: # service is a singleton result = self.user_function(headers, body) else: # service with multiple instances result = self.user_function(headers, body, instance) end = time.time() except AppException as e: error_code = e.get_status() error_msg = e.get_message() except ValueError as e: error_code = 400 error_msg = str(e) except Exception as e: error_code = 500 error_msg = str(e) # execution time is rounded to 3 decimal points exec_time = float(format((end - begin) * 1000, '.3f')) if error_code: if 'reply_to' in event: # set exception as result result = EventEnvelope().set_status(error_code).set_body( error_msg) else: self.log.warn("Unhandled exception for " + self.route + " - code=" + str(error_code) + ", message=" + error_msg) # # interceptor should not send regular response because it will forward the request to another function. # However, if error_code exists, the system will send the exception response. # This allows interceptor to simply throw exception to indicate an error case. # if 'reply_to' in event and (error_code or not self.interceptor): reply_to = event['reply_to'] # in case this is a RPC call from within if reply_to.startswith('->'): reply_to = reply_to[2:] response = EventEnvelope().set_to(reply_to) if not error_code: response.set_exec_time(exec_time, False) if 'extra' in event: response.set_extra(event['extra']) if 'cid' in event: response.set_correlation_id(event['cid']) if 'trace_id' in event and 'trace_path' in event: response.set_trace(event['trace_id'], event['trace_path']) if isinstance(result, EventEnvelope): for h in result.get_headers(): response.set_header(h, result.get_header(h)) response.set_body(result.get_body()) response.set_status(result.get_status()) else: response.set_body(result) try: self.platform.send_event(response.set_from(self.route)) except Exception as e: self.log.warn("Event dropped because " + str(e)) # send tracing info to distributed trace logger trace_info = self.platform.stop_tracing() if self.tracing and trace_info is not None and isinstance(trace_info, TraceInfo) \ and trace_info.get_id() is not None and trace_info.get_path() is not None: dt = EventEnvelope().set_to(self.DISTRIBUTED_TRACING).set_body( trace_info.get_annotations()) dt.set_header('origin', self.platform.get_origin()) dt.set_header('id', trace_info.get_id()).set_header( 'path', trace_info.get_path()) dt.set_header('service', self.route).set_header('start', trace_info.get_start_time()) if not error_code: dt.set_header('success', 'true') dt.set_header('exec_time', exec_time) else: dt.set_header('success', 'false') dt.set_header('status', error_code) dt.set_header('exception', error_msg) self.platform.send_event(dt) self._loop.call_soon_threadsafe(self._ack)