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conf.go
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conf.go
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package main
import (
"errors"
"io/ioutil"
"encoding/json"
"fmt"
"time"
"github.com/simonvetter/modbus"
)
type pollerConf struct {
Url string `json:"url"`
Targets []*targetConf `json:"targets"`
PollInterval_ms uint `json:"poll_interval_ms"`
Timeout_ms uint `json:"timeout_ms"`
Speed uint `json:"speed_bps"`
DataBits uint `json:"data_bits"`
StopBits uint `json:"stop_bits"`
Parity string `json:"parity"`
Endianness string `json:"endianness"`
WordOrder string `json:"word_order"`
}
type targetConf struct {
UnitId uint8 `json:"unit_id"`
RegType string `json:"register_type"`
RegAddr uint16 `json:"register_address"`
Label string `json:"label"`
ScaleFactor float64 `json:"scale_factor"`
Offset float64 `json:"offset"`
DecimalPlaces uint `json:"decimal_places"`
}
type sinkConf struct {
Type string `json:"type"`
FifoSize uint `json:"fifo_size"`
MaxAge_ms uint `json:"max_age_ms"`
Url string `json:"url"`
}
type jsonConf struct {
Pollers []*pollerConf `json:"pollers"`
Sinks []*sinkConf `json:"sinks"`
DispatchRate_ms uint `json:"dispatch_rate_ms"`
}
// Main configuration object.
type Configuration struct {
Pollers []*PollerConfiguration
Sinks []*sinkConf
DispatchRate time.Duration
}
// Loads a JSON configuration file, validates it and builds out
// the necessary configuration objects.
func Load(path string) (conf *Configuration, err error) {
var buf []byte
var jsonConf jsonConf
var labels map[string]bool
labels = make(map[string]bool)
conf = &Configuration{}
// read the json file and unmarshal it
buf, err = ioutil.ReadFile(path)
if err != nil {
return
}
err = json.Unmarshal(buf, &jsonConf)
if err != nil {
return
}
// dispatch_rate_ms is optional and defaults to 250ms
conf.DispatchRate = time.Duration(jsonConf.DispatchRate_ms) * time.Millisecond
if conf.DispatchRate == 0 {
conf.DispatchRate = 250 * time.Millisecond
}
if jsonConf.Pollers == nil {
err = errors.New("pollers section missing")
return
}
if len(jsonConf.Pollers) == 0 {
err = errors.New("no poller defined")
return
}
for _, pc := range jsonConf.Pollers {
var pollerConf PollerConfiguration
switch pc.Parity {
case "odd": pollerConf.Parity = modbus.PARITY_ODD
case "even": pollerConf.Parity = modbus.PARITY_EVEN
case "none", "": pollerConf.Parity = modbus.PARITY_NONE
default:
err = fmt.Errorf("unknown parity setting '%s'", pc.Parity)
return
}
if pc.Url == "" {
err = fmt.Errorf("poller url missing")
return
}
pollerConf.Url = pc.Url
// timeout defaults to 1s
pollerConf.Timeout = time.Duration(pc.Timeout_ms) * time.Millisecond
if pollerConf.Timeout == 0 {
pollerConf.Timeout = 1 * time.Second
}
pollerConf.PollInterval = time.Duration(pc.PollInterval_ms) * time.Millisecond
if pollerConf.PollInterval == 0 {
err = fmt.Errorf("poller poll_interval_ms missing")
return
}
pollerConf.Speed = pc.Speed
pollerConf.DataBits = pc.DataBits
pollerConf.StopBits = pc.StopBits
switch pc.Endianness {
case "big", "bigendian", "":
pollerConf.Endianness = modbus.BIG_ENDIAN
case "little", "littleendian":
pollerConf.Endianness = modbus.LITTLE_ENDIAN
default:
err = fmt.Errorf("unknown poller endianness setting '%s'",
pc.Endianness)
return
}
switch pc.WordOrder {
case "highfirst", "hf", "":
pollerConf.WordOrder = modbus.HIGH_WORD_FIRST
case "lowfirst", "lf":
pollerConf.WordOrder = modbus.LOW_WORD_FIRST
default:
err = fmt.Errorf("unknown poller word order setting '%s'",
pc.WordOrder)
return
}
for _, tc := range pc.Targets {
var target *Target
target = &Target{
RegAddr: tc.RegAddr,
Label: tc.Label,
UnitId: tc.UnitId,
ScaleFactor: tc.ScaleFactor,
Offset: tc.Offset,
DecimalPlaces: tc.DecimalPlaces,
}
// each target needs a system-wide unique label
if target.Label == "" {
err = fmt.Errorf("missing target label")
return
}
if labels[target.Label] {
err = fmt.Errorf("duplicate target label '%s'",
target.Label)
return
}
switch tc.RegType {
case "h:uint16", "holding:uint16":
target.ValueType = UINT16
target.MbType = modbus.HOLDING_REGISTER
case "h:int16", "holding:int16":
target.ValueType = INT16
target.MbType = modbus.HOLDING_REGISTER
case "h:uint32", "holding:uint32":
target.ValueType = UINT32
target.MbType = modbus.HOLDING_REGISTER
case "h:int32", "holding:int32":
target.ValueType = INT32
target.MbType = modbus.HOLDING_REGISTER
case "h:float32", "holding:float32":
target.ValueType = FLOAT32
target.MbType = modbus.HOLDING_REGISTER
case "i:uint16", "input:uint16":
target.ValueType = UINT16
target.MbType = modbus.INPUT_REGISTER
case "i:int16", "input:int16":
target.ValueType = INT16
target.MbType = modbus.INPUT_REGISTER
case "i:uint32", "input:uint32":
target.ValueType = UINT32
target.MbType = modbus.INPUT_REGISTER
case "i:int32", "input:int32":
target.ValueType = INT32
target.MbType = modbus.INPUT_REGISTER
case "i:float32", "input:float32":
target.ValueType = FLOAT32
target.MbType = modbus.INPUT_REGISTER
default:
err = fmt.Errorf("unknown register_type setting '%s'",
tc.RegType)
return
}
pollerConf.Targets = append(pollerConf.Targets, target)
// remember the target name
labels[target.Label] = true
}
conf.Pollers = append(conf.Pollers, &pollerConf)
}
if jsonConf.Sinks == nil {
err = errors.New("sinks section missing")
return
}
if len(jsonConf.Sinks) == 0 {
err = errors.New("no sinks defined")
return
}
conf.Sinks = jsonConf.Sinks
return
}