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Reader.go
110 lines (100 loc) · 3.27 KB
/
Reader.go
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/*
* 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 simulated
import (
"context"
"github.com/apache/plc4x/plc4go/spi/options"
"github.com/apache/plc4x/plc4go/spi/tracer"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"runtime/debug"
"strconv"
"time"
apiModel "github.com/apache/plc4x/plc4go/pkg/api/model"
apiValues "github.com/apache/plc4x/plc4go/pkg/api/values"
spiModel "github.com/apache/plc4x/plc4go/spi/model"
)
type Reader struct {
device *Device
options map[string][]string
tracer tracer.Tracer
log zerolog.Logger
}
func NewReader(device *Device, readerOptions map[string][]string, tracer tracer.Tracer, _options ...options.WithOption) *Reader {
customLogger := options.ExtractCustomLoggerOrDefaultToGlobal(_options...)
return &Reader{
device: device,
options: readerOptions,
tracer: tracer,
log: customLogger,
}
}
func (r *Reader) Read(_ context.Context, readRequest apiModel.PlcReadRequest) <-chan apiModel.PlcReadRequestResult {
ch := make(chan apiModel.PlcReadRequestResult, 1)
go func() {
defer func() {
if err := recover(); err != nil {
ch <- spiModel.NewDefaultPlcReadRequestResult(readRequest, nil, errors.Errorf("panic-ed %v. Stack: %s", err, debug.Stack()))
}
}()
var txId string
if r.tracer != nil {
txId = r.tracer.AddTransactionalStartTrace("read", "started")
}
// Possibly add a delay.
if delayString, ok := r.options["readDelay"]; ok {
if len(delayString) == 1 {
delay, err := strconv.Atoi(delayString[0])
if err == nil {
time.Sleep(time.Duration(delay) * time.Millisecond)
}
}
}
// Process the request
responseCodes := make(map[string]apiModel.PlcResponseCode)
responseValues := make(map[string]apiValues.PlcValue)
for _, tagName := range readRequest.GetTagNames() {
tag := readRequest.GetTag(tagName)
simulatedTagVar, ok := tag.(simulatedTag)
if !ok {
responseCodes[tagName] = apiModel.PlcResponseCode_INVALID_ADDRESS
responseValues[tagName] = nil
} else {
value := r.device.Get(simulatedTagVar)
if value == nil {
responseCodes[tagName] = apiModel.PlcResponseCode_NOT_FOUND
responseValues[tagName] = nil
} else {
responseCodes[tagName] = apiModel.PlcResponseCode_OK
responseValues[tagName] = *value
}
}
}
if r.tracer != nil {
r.tracer.AddTransactionalTrace(txId, "read", "success")
}
// Emit the response
ch <- spiModel.NewDefaultPlcReadRequestResult(
readRequest,
spiModel.NewDefaultPlcReadResponse(readRequest, responseCodes, responseValues),
nil,
)
}()
return ch
}