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registry.go
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/
registry.go
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package transform
import (
"fmt"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/types/known/anypb"
"sync"
)
type Factory struct {
Obj proto.Message
NewFunc func(message *anypb.Any) (Transform, error)
}
type Registry struct {
lock sync.RWMutex
transforms map[protoreflect.FullName]*Factory
}
func NewRegistry() *Registry {
return &Registry{
transforms: make(map[protoreflect.FullName]*Factory),
}
}
func (r *Registry) Register(f *Factory) {
r.lock.Lock()
defer r.lock.Unlock()
a, err := anypb.New(f.Obj)
if err != nil {
panic("unable to create any from proto message")
}
messageName := a.MessageName()
if messageName == "" {
panic("proto object message name cannot be blanked")
} else if _, ok := r.transforms[messageName]; ok {
panic(fmt.Sprintf("proto object message name %q already registered", a.TypeUrl))
}
r.transforms[messageName] = f
}
func (r *Registry) New(message *anypb.Any) (Transform, error) {
r.lock.Lock()
defer r.lock.Unlock()
messageName := message.MessageName()
factory, found := r.transforms[messageName]
if !found {
return nil, fmt.Errorf("no such transform registered %q", message.TypeUrl)
}
transform, err := factory.NewFunc(message)
if err != nil {
return nil, fmt.Errorf("unable to setup transform: %w", err)
}
return transform, nil
}