| /* |
| * 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 |
| * |
| * https://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. |
| */ |
| |
| package cbus |
| |
| import ( |
| "context" |
| "github.com/apache/plc4x/plc4go/spi/options" |
| "github.com/apache/plc4x/plc4go/spi/transactions" |
| "github.com/rs/zerolog" |
| "sync" |
| "time" |
| |
| apiModel "github.com/apache/plc4x/plc4go/pkg/api/model" |
| readWriteModel "github.com/apache/plc4x/plc4go/protocols/cbus/readwrite/model" |
| "github.com/apache/plc4x/plc4go/spi" |
| spiModel "github.com/apache/plc4x/plc4go/spi/model" |
| "github.com/pkg/errors" |
| ) |
| |
| type Writer struct { |
| alphaGenerator *AlphaGenerator |
| messageCodec *MessageCodec |
| tm transactions.RequestTransactionManager |
| |
| log zerolog.Logger |
| } |
| |
| func NewWriter(tpduGenerator *AlphaGenerator, messageCodec *MessageCodec, tm transactions.RequestTransactionManager, _options ...options.WithOption) *Writer { |
| return &Writer{ |
| alphaGenerator: tpduGenerator, |
| messageCodec: messageCodec, |
| tm: tm, |
| |
| log: options.ExtractCustomLogger(_options...), |
| } |
| } |
| |
| func (m *Writer) Write(ctx context.Context, writeRequest apiModel.PlcWriteRequest) <-chan apiModel.PlcWriteRequestResult { |
| m.log.Trace().Msg("Writing") |
| result := make(chan apiModel.PlcWriteRequestResult, 1) |
| go func() { |
| defer func() { |
| if err := recover(); err != nil { |
| result <- spiModel.NewDefaultPlcWriteRequestResult(writeRequest, nil, errors.Errorf("panic-ed %v", err)) |
| } |
| }() |
| numTags := len(writeRequest.GetTagNames()) |
| if numTags > 20 { // letters g-z |
| result <- spiModel.NewDefaultPlcWriteRequestResult( |
| writeRequest, |
| nil, |
| errors.New("Only 20 tags can be handled at once"), |
| ) |
| return |
| } |
| |
| messages := make(map[string]readWriteModel.CBusMessage) |
| for _, tagName := range writeRequest.GetTagNames() { |
| tag := writeRequest.GetTag(tagName) |
| plcValue := writeRequest.GetValue(tagName) |
| message, _, supportsWrite, _, err := TagToCBusMessage(tag, plcValue, m.alphaGenerator, m.messageCodec) |
| if !supportsWrite { |
| result <- spiModel.NewDefaultPlcWriteRequestResult( |
| writeRequest, |
| nil, |
| errors.Wrapf(err, "Error encoding cbus message for tag %s. Tag is not meant to be written.", tagName), |
| ) |
| return |
| } |
| if err != nil { |
| result <- spiModel.NewDefaultPlcWriteRequestResult( |
| writeRequest, |
| nil, |
| errors.Wrapf(err, "Error encoding cbus message for tag %s", tagName), |
| ) |
| return |
| } |
| messages[tagName] = message |
| } |
| responseMu := sync.Mutex{} |
| responseCodes := map[string]apiModel.PlcResponseCode{} |
| addResponseCode := func(name string, responseCode apiModel.PlcResponseCode) { |
| responseMu.Lock() |
| defer responseMu.Unlock() |
| responseCodes[name] = responseCode |
| } |
| for tagName, messageToSend := range messages { |
| if err := ctx.Err(); err != nil { |
| result <- spiModel.NewDefaultPlcWriteRequestResult(writeRequest, nil, err) |
| return |
| } |
| tagNameCopy := tagName |
| // Start a new request-transaction (Is ended in the response-handler) |
| transaction := m.tm.StartTransaction() |
| transaction.Submit(func(transaction transactions.RequestTransaction) { |
| // Send the over the wire |
| m.log.Trace().Msg("Send ") |
| if err := m.messageCodec.SendRequest(ctx, messageToSend, func(receivedMessage spi.Message) bool { |
| cbusMessage, ok := receivedMessage.(readWriteModel.CBusMessageExactly) |
| if !ok { |
| return false |
| } |
| messageToClient, ok := cbusMessage.(readWriteModel.CBusMessageToClientExactly) |
| if !ok { |
| return false |
| } |
| // Check if this errored |
| if _, ok = messageToClient.GetReply().(readWriteModel.ServerErrorReplyExactly); ok { |
| // This means we must handle this below |
| return true |
| } |
| |
| confirmation, ok := messageToClient.GetReply().(readWriteModel.ReplyOrConfirmationConfirmationExactly) |
| if !ok { |
| return false |
| } |
| return confirmation.GetConfirmation().GetAlpha().GetCharacter() == messageToSend.(readWriteModel.CBusMessageToServer).GetRequest().(readWriteModel.RequestCommand).GetAlpha().GetCharacter() |
| }, func(receivedMessage spi.Message) error { |
| // Convert the response into an |
| addResponseCode(tagName, apiModel.PlcResponseCode_OK) |
| return transaction.EndRequest() |
| }, func(err error) error { |
| m.log.Debug().Msgf("Error waiting for tag %s", tagNameCopy) |
| addResponseCode(tagNameCopy, apiModel.PlcResponseCode_REQUEST_TIMEOUT) |
| // TODO: ok or not ok? |
| return transaction.EndRequest() |
| }, time.Second*1); err != nil { |
| m.log.Debug().Err(err).Msgf("Error sending message for tag %s", tagNameCopy) |
| addResponseCode(tagNameCopy, apiModel.PlcResponseCode_INTERNAL_ERROR) |
| if err := transaction.FailRequest(errors.Errorf("timeout after %s", time.Second*1)); err != nil { |
| m.log.Debug().Err(err).Msg("Error failing request") |
| } |
| } |
| }) |
| } |
| readResponse := spiModel.NewDefaultPlcWriteResponse(writeRequest, responseCodes) |
| result <- spiModel.NewDefaultPlcWriteRequestResult(writeRequest, readResponse, nil) |
| }() |
| return result |
| } |