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controller_config.go
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/
controller_config.go
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package configset_proto
import (
"context"
"encoding/base64"
"github.com/aperturerobotics/controllerbus/bus"
"github.com/aperturerobotics/controllerbus/config"
"github.com/aperturerobotics/controllerbus/controller/configset"
"github.com/aperturerobotics/controllerbus/controller/resolver"
jsoniter "github.com/aperturerobotics/json-iterator-lite"
"github.com/aperturerobotics/protobuf-go-lite/json"
"github.com/pkg/errors"
)
// NewControllerConfig constructs a new controller config.
func NewControllerConfig(c configset.ControllerConfig, useJson bool) (*ControllerConfig, error) {
conf := c.GetConfig()
cID := conf.GetConfigID()
var confData []byte
var err error
if useJson {
confData, err = conf.MarshalJSON()
} else {
confData, err = conf.MarshalVT()
}
if err != nil {
return nil, err
}
return &ControllerConfig{
Id: cID,
Config: confData,
Rev: c.GetRev(),
}, nil
}
// Validate performs cursory validation of the controller config.
func (c *ControllerConfig) Validate() error {
if len(c.GetId()) == 0 {
return ErrControllerConfigIdEmpty
}
if conf := c.GetConfig(); len(conf) != 0 {
// json if first character is {
if conf[0] == 123 {
// validate json
it := jsoniter.ParseBytes(conf)
if err := it.Error; err != nil {
return err
}
}
}
return nil
}
// Resolve resolves the config into a configset.ControllerConfig
func (c *ControllerConfig) Resolve(ctx context.Context, b bus.Bus) (configset.ControllerConfig, error) {
if len(c.GetId()) == 0 {
return nil, ErrControllerConfigIdEmpty
}
configCtorDir := resolver.NewLoadConfigConstructorByID(c.GetId())
configCtorVal, _, configCtorRef, err := bus.ExecOneOff(ctx, b, configCtorDir, nil, nil)
if err != nil {
if err == context.Canceled {
return nil, err
}
return nil, errors.WithMessage(err, "resolve config object")
}
defer configCtorRef.Release()
ctor, ctorOk := configCtorVal.GetValue().(config.Constructor)
if !ctorOk {
return nil, errors.New("load config constructor directive returned invalid object")
}
cf := ctor.ConstructConfig()
// detect json or protobuf & parse
if configData := c.GetConfig(); len(configData) != 0 {
// if configData[0] == '{'
if configData[0] == 123 {
err = cf.UnmarshalJSON(configData)
} else {
err = cf.UnmarshalVT(configData)
}
if err != nil {
return nil, err
}
}
return configset.NewControllerConfig(c.GetRev(), cf), nil
}
// MarshalProtoJSON marshals the ControllerConfig message to JSON.
func (c *ControllerConfig) MarshalProtoJSON(s *json.MarshalState) {
if c == nil {
s.WriteNil()
return
}
s.WriteObjectStart()
var wroteField bool
if c.Id != "" || s.HasField("id") {
s.WriteMoreIf(&wroteField)
s.WriteObjectField("id")
s.WriteString(c.Id)
}
if c.Rev != 0 || s.HasField("rev") {
s.WriteMoreIf(&wroteField)
s.WriteObjectField("rev")
s.WriteUint64(c.Rev)
}
if len(c.Config) > 0 || s.HasField("config") {
s.WriteMoreIf(&wroteField)
s.WriteObjectField("config")
// Detect if config is JSON
if c.Config[0] == '{' && c.Config[len(c.Config)-1] == '}' {
// Ensure json is parseable
it := jsoniter.ParseBytes(c.Config)
if err := it.Error; err != nil {
s.SetError(errors.Wrap(err, "unable to parse config json"))
return
}
_, err := s.Write(c.Config)
if err != nil {
s.SetError(err)
return
}
} else {
// Base58 encoded string
s.WriteString(base64.RawStdEncoding.EncodeToString(c.Config))
}
}
s.WriteObjectEnd()
}
// MarshalJSON marshals the ControllerConfig to JSON.
func (c *ControllerConfig) MarshalJSON() ([]byte, error) {
return json.DefaultMarshalerConfig.Marshal(c)
}
// UnmarshalJSON unmarshals the ControllerConfig from JSON.
func (c *ControllerConfig) UnmarshalJSON(b []byte) error {
return json.DefaultUnmarshalerConfig.Unmarshal(b, c)
}
func (c *ControllerConfig) UnmarshalProtoJSON(s *json.UnmarshalState) {
for key := s.ReadObjectField(); key != ""; key = s.ReadObjectField() {
switch key {
case "id":
c.Id = s.ReadString()
case "rev", "revision":
c.Rev = s.ReadUint64()
case "config":
if s.ReadNil() {
break
}
nextTok := s.WhatIsNext()
if nextTok == jsoniter.StringValue {
// Expect base58 encoded string
var err error
c.Config, err = base64.RawStdEncoding.DecodeString(s.ReadString())
if err != nil {
s.SetError(errors.Wrap(err, "unmarshal config value as base58 string"))
return
}
} else if nextTok == jsoniter.ObjectValue {
c.Config = s.SkipAndReturnBytes()
} else {
s.SetError(errors.Errorf("invalid json value for config: type %v", nextTok))
return
}
default:
s.Skip()
}
}
}
// _ is a type assertion
var (
_ json.Unmarshaler = ((*ControllerConfig)(nil))
_ json.Marshaler = ((*ControllerConfig)(nil))
)