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typed.go
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typed.go
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package peanats
import (
"context"
"encoding/json"
"fmt"
"net/http"
"google.golang.org/protobuf/encoding/prototext"
"github.com/nats-io/nats.go"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
type TypedRequest[T any] interface {
Context() context.Context
Header() nats.Header
Payload() *T
}
type TypedPublisher[ResT any] interface {
Header() *nats.Header
Publish(*ResT) error
Subject() string
WithSubject(string) TypedPublisher[ResT]
}
type TypedHandler[ArgT, ResT any] interface {
Serve(TypedPublisher[ResT], TypedRequest[ArgT]) error
}
type TypedHandlerFunc[ArgT, ResT any] func(TypedPublisher[ResT], TypedRequest[ArgT]) error
func (f TypedHandlerFunc[ArgT, ResT]) Serve(pub TypedPublisher[ResT], req TypedRequest[ArgT]) error {
return f(pub, req)
}
func Typed[ArgT, ResT any](c Codec, f TypedHandler[ArgT, ResT]) Handler {
return HandlerFunc(func(pub Publisher, req Request) error {
arg := new(ArgT)
if err := c.Decode(req.Data(), arg); err != nil {
return &Error{
Code: http.StatusBadRequest,
Message: http.StatusText(http.StatusBadRequest),
Cause: err,
}
}
return f.Serve(
&typedPublisherImpl[ResT]{c, pub},
&typedRequestImpl[ArgT]{arg: arg, req: req},
)
})
}
type typedRequestImpl[ArgT any] struct {
req Request
arg *ArgT
}
func (r *typedRequestImpl[ArgT]) Context() context.Context {
return r.req.Context()
}
func (r *typedRequestImpl[ArgT]) Header() nats.Header {
return r.req.Header()
}
func (r *typedRequestImpl[ArgT]) Payload() *ArgT {
return r.arg
}
type typedPublisherImpl[RS any] struct {
codec Codec
pub Publisher
}
func (p *typedPublisherImpl[RS]) Header() *nats.Header {
return p.pub.Header()
}
func (p *typedPublisherImpl[RS]) Publish(v *RS) error {
data, err := p.codec.Encode(v)
if err != nil {
return &Error{
Code: http.StatusInternalServerError,
Message: http.StatusText(http.StatusInternalServerError),
Cause: err,
}
}
return p.pub.Publish(data)
}
func (p *typedPublisherImpl[RS]) Subject() string {
return p.pub.Subject()
}
func (p *typedPublisherImpl[RS]) WithSubject(subject string) TypedPublisher[RS] {
return &typedPublisherImpl[RS]{
codec: p.codec,
pub: p.pub.WithSubject(subject),
}
}
type Codec interface {
Encode(v any) ([]byte, error)
Decode(data []byte, vPtr any) error
}
type JsonCodec struct{}
func (JsonCodec) Encode(v any) ([]byte, error) {
return json.Marshal(v)
}
func (JsonCodec) Decode(data []byte, vPtr any) error {
return json.Unmarshal(data, vPtr)
}
type ProtoCodec struct{}
func (ProtoCodec) Encode(v any) ([]byte, error) {
if msg, ok := v.(proto.Message); ok {
return proto.Marshal(msg)
}
return nil, fmt.Errorf("%T is not a proto.Message", v)
}
func (ProtoCodec) Decode(data []byte, vPtr any) error {
if msg, ok := vPtr.(proto.Message); ok {
return proto.Unmarshal(data, msg)
}
return fmt.Errorf("%T is not a proto.Message", vPtr)
}
type ProtojsonCodec struct{}
func (ProtojsonCodec) Encode(v any) ([]byte, error) {
if msg, ok := v.(proto.Message); ok {
return protojson.Marshal(msg)
}
return nil, fmt.Errorf("%T is not a proto.Message", v)
}
func (ProtojsonCodec) Decode(data []byte, vPtr any) error {
if msg, ok := vPtr.(proto.Message); ok {
return protojson.Unmarshal(data, msg)
}
return fmt.Errorf("%T is not a proto.Message", vPtr)
}
type PrototextCodec struct{}
func (PrototextCodec) Encode(v any) ([]byte, error) {
if msg, ok := v.(proto.Message); ok {
return prototext.Marshal(msg)
}
return nil, fmt.Errorf("%T is not a proto.Message", v)
}
func (PrototextCodec) Decode(data []byte, vPtr any) error {
if msg, ok := vPtr.(proto.Message); ok {
return prototext.Unmarshal(data, msg)
}
return fmt.Errorf("%T is not a proto.Message", vPtr)
}