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configuration_request.go
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configuration_request.go
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package modbus
import (
_ "embed"
"fmt"
"hash/maphash"
)
// DO NOT REMOVE THE NEXT TWO LINES! This is required to embed the sampleConfig data.
//go:embed sample_request.conf
var sampleConfigPartPerRequest string
type requestFieldDefinition struct {
Address uint16 `toml:"address"`
Name string `toml:"name"`
InputType string `toml:"type"`
Scale float64 `toml:"scale"`
OutputType string `toml:"output"`
Measurement string `toml:"measurement"`
Omit bool `toml:"omit"`
}
type requestDefinition struct {
SlaveID byte `toml:"slave_id"`
ByteOrder string `toml:"byte_order"`
RegisterType string `toml:"register"`
Measurement string `toml:"measurement"`
Fields []requestFieldDefinition `toml:"fields"`
Tags map[string]string `toml:"tags"`
}
type ConfigurationPerRequest struct {
Requests []requestDefinition `toml:"request"`
}
func (c *ConfigurationPerRequest) SampleConfigPart() string {
return sampleConfigPartPerRequest
}
func (c *ConfigurationPerRequest) Check() error {
seed := maphash.MakeSeed()
seenFields := make(map[uint64]bool)
for _, def := range c.Requests {
// Check byte order of the data
switch def.ByteOrder {
case "":
def.ByteOrder = "ABCD"
case "ABCD", "DCBA", "BADC", "CDAB", "MSW-BE", "MSW-LE", "LSW-LE", "LSW-BE":
default:
return fmt.Errorf("unknown byte-order %q", def.ByteOrder)
}
// Check register type
switch def.RegisterType {
case "":
def.RegisterType = "holding"
case "coil", "discrete", "holding", "input":
default:
return fmt.Errorf("unknown register-type %q", def.RegisterType)
}
// Set the default for measurement if required
if def.Measurement == "" {
def.Measurement = "modbus"
}
// Check the fields
for fidx, f := range def.Fields {
// Check the input type for all fields except the bit-field ones.
// We later need the type (even for omitted fields) to determine the length.
if def.RegisterType == cHoldingRegisters || def.RegisterType == cInputRegisters {
switch f.InputType {
case "INT16", "UINT16", "INT32", "UINT32", "INT64", "UINT64", "FLOAT32", "FLOAT64":
default:
return fmt.Errorf("unknown register data-type %q for field %q", f.InputType, f.Name)
}
}
// Other properties don't need to be checked for omitted fields
if f.Omit {
continue
}
// Name is mandatory
if f.Name == "" {
return fmt.Errorf("empty field name in request for slave %d", def.SlaveID)
}
// Check fields only relevant for non-bit register types
if def.RegisterType == cHoldingRegisters || def.RegisterType == cInputRegisters {
// Check output type
switch f.OutputType {
case "", "INT64", "UINT64", "FLOAT64":
default:
return fmt.Errorf("unknown output data-type %q for field %q", f.OutputType, f.Name)
}
}
// Handle the default for measurement
if f.Measurement == "" {
f.Measurement = def.Measurement
}
def.Fields[fidx] = f
// Check for duplicate field definitions
id, err := c.fieldID(seed, def.SlaveID, def.RegisterType, def.Measurement, f.Name)
if err != nil {
return fmt.Errorf("cannot determine field id for %q: %v", f.Name, err)
}
if seenFields[id] {
return fmt.Errorf("field %q duplicated in measurement %q (slave %d/%q)", f.Name, f.Measurement, def.SlaveID, def.RegisterType)
}
seenFields[id] = true
}
}
return nil
}
func (c *ConfigurationPerRequest) Process() (map[byte]requestSet, error) {
result := map[byte]requestSet{}
for _, def := range c.Requests {
// Set default
if def.RegisterType == "" {
def.RegisterType = "holding"
}
// Construct the fields
isTyped := def.RegisterType == "holding" || def.RegisterType == "input"
fields, err := c.initFields(def.Fields, isTyped, def.ByteOrder)
if err != nil {
return nil, err
}
// Make sure we have a set to work with
set, found := result[def.SlaveID]
if !found {
set = requestSet{
coil: []request{},
discrete: []request{},
holding: []request{},
input: []request{},
}
}
switch def.RegisterType {
case "coil":
requests := groupFieldsToRequests(fields, def.Tags, maxQuantityCoils)
set.coil = append(set.coil, requests...)
case "discrete":
requests := groupFieldsToRequests(fields, def.Tags, maxQuantityDiscreteInput)
set.discrete = append(set.discrete, requests...)
case "holding":
requests := groupFieldsToRequests(fields, def.Tags, maxQuantityHoldingRegisters)
set.holding = append(set.holding, requests...)
case "input":
requests := groupFieldsToRequests(fields, def.Tags, maxQuantityInputRegisters)
set.input = append(set.input, requests...)
default:
return nil, fmt.Errorf("unknown register type %q", def.RegisterType)
}
result[def.SlaveID] = set
}
return result, nil
}
func (c *ConfigurationPerRequest) initFields(fieldDefs []requestFieldDefinition, typed bool, byteOrder string) ([]field, error) {
// Construct the fields from the field definitions
fields := make([]field, 0, len(fieldDefs))
for _, def := range fieldDefs {
f, err := c.newFieldFromDefinition(def, typed, byteOrder)
if err != nil {
return nil, fmt.Errorf("initializing field %q failed: %v", def.Name, err)
}
fields = append(fields, f)
}
return fields, nil
}
func (c *ConfigurationPerRequest) newFieldFromDefinition(def requestFieldDefinition, typed bool, byteOrder string) (field, error) {
var err error
fieldLength := uint16(1)
if typed {
if fieldLength, err = c.determineFieldLength(def.InputType); err != nil {
return field{}, err
}
}
// Initialize the field
f := field{
measurement: def.Measurement,
name: def.Name,
address: def.Address,
length: fieldLength,
omit: def.Omit,
}
// No more processing for un-typed (coil and discrete registers) or omitted fields
if !typed || def.Omit {
return f, nil
}
// Automagically determine the output type...
if def.OutputType == "" {
if def.Scale == 0.0 {
// For non-scaling cases we should choose the output corresponding to the input class
// i.e. INT64 for INT*, UINT64 for UINT* etc.
var err error
if def.OutputType, err = c.determineOutputDatatype(def.InputType); err != nil {
return field{}, err
}
} else {
// For scaling cases we always want FLOAT64 by default
def.OutputType = "FLOAT64"
}
}
// Setting default byte-order
if byteOrder == "" {
byteOrder = "ABCD"
}
// Normalize the data relevant for determining the converter
inType, err := normalizeInputDatatype(def.InputType)
if err != nil {
return field{}, err
}
outType, err := normalizeOutputDatatype(def.OutputType)
if err != nil {
return field{}, err
}
order, err := normalizeByteOrder(byteOrder)
if err != nil {
return field{}, err
}
f.converter, err = determineConverter(inType, order, outType, def.Scale)
if err != nil {
return field{}, err
}
return f, nil
}
func (c *ConfigurationPerRequest) fieldID(seed maphash.Seed, slave byte, register, measurement, name string) (uint64, error) {
var mh maphash.Hash
mh.SetSeed(seed)
if err := mh.WriteByte(slave); err != nil {
return 0, err
}
if err := mh.WriteByte(0); err != nil {
return 0, err
}
if _, err := mh.WriteString(register); err != nil {
return 0, err
}
if err := mh.WriteByte(0); err != nil {
return 0, err
}
if _, err := mh.WriteString(measurement); err != nil {
return 0, err
}
if err := mh.WriteByte(0); err != nil {
return 0, err
}
if _, err := mh.WriteString(name); err != nil {
return 0, err
}
if err := mh.WriteByte(0); err != nil {
return 0, err
}
return mh.Sum64(), nil
}
func (c *ConfigurationPerRequest) determineOutputDatatype(input string) (string, error) {
// Handle our special types
switch input {
case "INT16", "INT32", "INT64":
return "INT64", nil
case "UINT16", "UINT32", "UINT64":
return "UINT64", nil
case "FLOAT32", "FLOAT64":
return "FLOAT64", nil
}
return "unknown", fmt.Errorf("invalid input datatype %q for determining output", input)
}
func (c *ConfigurationPerRequest) determineFieldLength(input string) (uint16, error) {
// Handle our special types
switch input {
case "INT16", "UINT16":
return 1, nil
case "INT32", "UINT32", "FLOAT32":
return 2, nil
case "INT64", "UINT64", "FLOAT64":
return 4, nil
}
return 0, fmt.Errorf("invalid input datatype %q for determining field length", input)
}