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# Licensed to the Apache Software Foundation (ASF) under one |
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# or more contributor license agreements. See the NOTICE file |
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# distributed with this work for additional information |
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# regarding copyright ownership. The ASF licenses this file |
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# to you under the Apache License, Version 2.0 (the |
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# "License"); you may not use this file except in compliance |
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# with the License. You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, |
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# software distributed under the License is distributed on an |
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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# KIND, either express or implied. See the License for the |
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# specific language governing permissions and limitations |
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# under the License. |
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import ast |
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import logging |
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import threading |
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import time |
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import uuid |
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import pyarrow |
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import pyarrow.flight |
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logger = logging.getLogger('__main__.' + __name__) |
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class FlightServer(pyarrow.flight.FlightServerBase): |
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def __init__(self, host="localhost", location=None, |
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tls_certificates=None, verify_client=False, |
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root_certificates=None, auth_handler=None, middleware=None): |
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super(FlightServer, self).__init__( |
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location, auth_handler, tls_certificates, verify_client, |
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root_certificates, middleware) |
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self.flights = {} |
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self.host = host |
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self.tls_certificates = tls_certificates |
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self.location = location |
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@classmethod |
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def descriptor_to_key(self, descriptor): |
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return (descriptor.descriptor_type.value, descriptor.command, |
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tuple(descriptor.path or tuple())) |
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def _make_flight_info(self, key, descriptor, table): |
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if self.tls_certificates: |
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location = pyarrow.flight.Location.for_grpc_tls( |
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self.host, self.port) |
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else: |
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location = pyarrow.flight.Location.for_grpc_tcp( |
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self.host, self.port) |
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endpoints = [pyarrow.flight.FlightEndpoint(repr(key), [location]), ] |
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mock_sink = pyarrow.MockOutputStream() |
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stream_writer = pyarrow.RecordBatchStreamWriter( |
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mock_sink, table.schema) |
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stream_writer.write_table(table) |
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stream_writer.close() |
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data_size = mock_sink.size() |
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return pyarrow.flight.FlightInfo(table.schema, |
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descriptor, endpoints, |
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table.num_rows, data_size) |
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def list_flights(self, context, criteria): |
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for key, table in self.flights.items(): |
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if key[1] is not None: |
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descriptor = \ |
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pyarrow.flight.FlightDescriptor.for_command(key[1]) |
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else: |
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descriptor = pyarrow.flight.FlightDescriptor.for_path(*key[2]) |
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yield self._make_flight_info(key, descriptor, table) |
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def get_flight_info(self, context, descriptor): |
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key = FlightServer.descriptor_to_key(descriptor) |
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logger.info(f"get_flight_info: key={key}") |
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if key in self.flights: |
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table = self.flights[key] |
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return self._make_flight_info(key, descriptor, table) |
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raise KeyError('Flight not found.') |
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def do_put(self, context, descriptor, reader, writer): |
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key = FlightServer.descriptor_to_key(descriptor) |
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logger.info(f"do_put: key={key}") |
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self.flights[key] = reader.read_all() |
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def do_get(self, context, ticket): |
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logger.info(f"do_get: ticket={ticket}") |
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key = ast.literal_eval(ticket.ticket.decode()) |
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if key not in self.flights: |
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logger.warn(f"do_get: key={key} not found") |
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return None |
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logger.info(f"do_get: returning key={key}") |
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flight = self.flights.pop(key) |
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return pyarrow.flight.RecordBatchStream(flight) |
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def list_actions(self, context): |
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return iter([ |
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("getUniquePath", "Get a unique FlightDescriptor path to put data to."), |
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("clear", "Clear the stored flights."), |
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("shutdown", "Shut down this server."), |
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]) |
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def do_action(self, context, action): |
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logger.info(f"do_action: action={action.type}") |
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if action.type == "getUniquePath": |
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uniqueId = str(uuid.uuid4()) |
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logger.info(f"getUniquePath id={uniqueId}") |
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yield uniqueId.encode('utf-8') |
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elif action.type == "clear": |
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self._clear() |
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elif action.type == "healthcheck": |
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pass |
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elif action.type == "shutdown": |
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self._clear() |
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yield pyarrow.flight.Result(pyarrow.py_buffer(b'Shutdown!')) |
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# Shut down on background thread to avoid blocking current |
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# request |
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threading.Thread(target=self._shutdown).start() |
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else: |
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raise KeyError("Unknown action {!r}".format(action.type)) |
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def _clear(self): |
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"""Clear the stored flights.""" |
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self.flights = {} |
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def _shutdown(self): |
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"""Shut down after a delay.""" |
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logger.info("Server is shutting down...") |
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time.sleep(2) |
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self.shutdown() |
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def start(server): |
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logger.info(f"Serving on {server.location}") |
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server.serve() |
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if __name__ == '__main__': |
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start() |
tableau /
TabPy
