wjones127 commented on a change in pull request #12044: URL: https://github.com/apache/arrow/pull/12044#discussion_r779119132
########## File path: csharp/examples/FlightAspServerExample/Services/InMemoryFlightServer.cs ########## @@ -0,0 +1,158 @@ +// 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. + +using Apache.Arrow; +using Apache.Arrow.Flight; +using Apache.Arrow.Flight.Server; +using Grpc.Core; + +namespace FlightAspServerExample.Services +{ + public class FlightData + { + public FlightData() + { + flights = new Dictionary<FlightTicket, FlightInfo> { }; + tables = new Dictionary<FlightTicket, List<RecordBatch>> { }; + } + public IDictionary<FlightTicket, FlightInfo> flights; + public IDictionary<FlightTicket, List<RecordBatch>> tables; + } + + public class InMemoryFlightServer : FlightServer + { + private FlightData _flightData; + + public InMemoryFlightServer(FlightData flightData) + { + _flightData = flightData; + } + + public override async Task DoPut( + FlightServerRecordBatchStreamReader requestStream, + IAsyncStreamWriter<FlightPutResult> responseStream, + ServerCallContext context + ) + { + var newTable = new List<RecordBatch> { }; + Int64 numRows = 0; + + await foreach (var batch in requestStream.ReadAllAsync(context.CancellationToken)) + { + newTable.Add(batch); + numRows += batch.Length; + } + + var descriptor = await requestStream.FlightDescriptor; + var ticket = DescriptorAsTicket(descriptor); + var schema = await requestStream.Schema; + + _flightData.flights.Add(ticket, new FlightInfo( + schema, + descriptor, + new List<FlightEndpoint> { GetEndpoint(ticket, $"http://{context.Host}";) }, + numRows, + -1 // Unknown + )); + _flightData.tables.Add(ticket, newTable); + + await responseStream.WriteAsync(new FlightPutResult("Table saved.")); + } + + public override async Task DoGet( + FlightTicket ticket, + FlightServerRecordBatchStreamWriter responseStream, + ServerCallContext context + ) + { + if (!_flightData.tables.ContainsKey(ticket)) + { + throw new RpcException(new Status(StatusCode.NotFound, "Flight not found.")); + } + var table = _flightData.tables[ticket]; + + foreach (var batch in table) { + await responseStream.WriteAsync(batch); + } + } + + public override async Task ListFlights( + FlightCriteria request, + IAsyncStreamWriter<FlightInfo> responseStream, + ServerCallContext context + ) + { + foreach (var flight in _flightData.flights.Values) + { + await responseStream.WriteAsync(flight); + } + } + + public override async Task<FlightInfo> GetFlightInfo(FlightDescriptor request, ServerCallContext context) + { + var key = DescriptorAsTicket(request); + if (_flightData.flights.ContainsKey(key)) + { + return _flightData.flights[key]; + } + else + { + throw new RpcException(new Status(StatusCode.NotFound, "Flight not found.")); + } + } + + public override async Task ListActions( + IAsyncStreamWriter<FlightActionType> responseStream, + ServerCallContext context + ) + { + await responseStream.WriteAsync(new FlightActionType("clear", "Clear the flights from the server")); + } + + public override async Task DoAction( + FlightAction request, + IAsyncStreamWriter<FlightResult> responseStream, + ServerCallContext context + ) + { + if (request.Type == "clear") + { + _flightData.flights.Clear(); + _flightData.tables.Clear(); + } + else + { + throw new RpcException(new Status(StatusCode.InvalidArgument, "Action does not exist.")); + } + } + + public override async Task<Schema> GetSchema(FlightDescriptor request, ServerCallContext context) + { + var info = await GetFlightInfo(request, context); + return info.Schema; + } + + private FlightTicket DescriptorAsTicket(FlightDescriptor desc) + { + return new FlightTicket(desc.ToString()); Review comment: Ah right. Good catch. Switching to `desc.Command`, which is the property we are passing. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
