HyukjinKwon commented on code in PR #47133: URL: https://github.com/apache/spark/pull/47133#discussion_r1681915902
########## python/pyspark/sql/streaming/state_api_client.py: ########## @@ -0,0 +1,142 @@ +# +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. +# The ASF licenses this file to You under the Apache License, Version 2.0 +# (the "License"); you may not use this file except in compliance with +# the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +from enum import Enum +import os +import socket +from typing import Any, Union, cast + +import pyspark.sql.streaming.StateMessage_pb2 as stateMessage +from pyspark.serializers import write_int, read_int, UTF8Deserializer +from pyspark.sql.types import StructType, _parse_datatype_string + + +class StatefulProcessorHandleState(Enum): + CREATED = 1 + INITIALIZED = 2 + DATA_PROCESSED = 3 + CLOSED = 4 + + +class StateApiClient: + def __init__( + self, + state_server_id: int) -> None: + self._client_socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) + server_address = f'./uds_{state_server_id}.sock' + self._client_socket.connect(server_address) + self.sockfile = self._client_socket.makefile("rwb", + int(os.environ.get("SPARK_BUFFER_SIZE",65536))) + print(f"client is ready - connection established") + self.handle_state = StatefulProcessorHandleState.CREATED + self.utf8_deserializer = UTF8Deserializer() + + def set_handle_state(self, state: StatefulProcessorHandleState) -> None: + print(f"setting handle state to: {state}") + proto_state = self._get_proto_state(state) + set_handle_state = stateMessage.SetHandleState(state=proto_state) + handle_call = stateMessage.StatefulProcessorCall(setHandleState=set_handle_state) + message = stateMessage.StateRequest(statefulProcessorCall=handle_call) + + self._send_proto_message(message) + + response_message = self._receive_proto_message() + status = response_message.statusCode + if (status == 0): + self.handle_state = state + else: + raise Exception(f"Error setting handle state: {response_message.errorMessage}") + print(f"setHandleState status= {status}") + + def set_implicit_key(self, key: str) -> None: + print(f"setting implicit key: {key}") + set_implicit_key = stateMessage.SetImplicitKey(key=key) + request = stateMessage.ImplicitGroupingKeyRequest(setImplicitKey=set_implicit_key) + message = stateMessage.StateRequest(implicitGroupingKeyRequest=request) + + self._send_proto_message(message) + response_message = self._receive_proto_message() + status = response_message.statusCode + print(f"setImplicitKey status= {status}") + if (status != 0): + raise Exception(f"Error setting implicit key: {response_message.errorMessage}") + + def remove_implicit_key(self) -> None: + print(f"removing implicit key") + remove_implicit_key = stateMessage.RemoveImplicitKey() + request = stateMessage.ImplicitGroupingKeyRequest(removeImplicitKey=remove_implicit_key) + message = stateMessage.StateRequest(implicitGroupingKeyRequest=request) + + self._send_proto_message(message) + response_message = self._receive_proto_message() + status = response_message.statusCode + print(f"removeImplicitKey status= {status}") + if (status != 0): + raise Exception(f"Error removing implicit key: {response_message.errorMessage}") + + def get_value_state(self, state_name: str, schema: Union[StructType, str]) -> None: + if isinstance(schema, str): + schema = cast(StructType, _parse_datatype_string(schema)) + + print(f"initializing value state: {state_name}") + + state_call_command = stateMessage.StateCallCommand() + state_call_command.stateName = state_name + state_call_command.schema = schema.json() + call = stateMessage.StatefulProcessorCall(getValueState=state_call_command) + message = stateMessage.StateRequest(statefulProcessorCall=call) + + self._send_proto_message(message) + response_message = self._receive_proto_message() + status = response_message.statusCode + if (status != 0): + raise Exception(f"Error initializing value state: {response_message.errorMessage}") + print(f"getValueState status= {status}") + + def _get_proto_state(self, Review Comment: yes if this is meant to be private -- This is an automated message from the Apache Git Service. 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