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Go
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899package agentproto
import ( "encoding/binary" "fmt" "io" "sync"
"google.golang.org/protobuf/proto"
"buf.build/go/protovalidate" agentv1 "tangled.org/core/spindle/agentproto/gen")
const ( ProtocolVersion = 1 DefaultPort = 10240 MaxMessageBytes = 1024 * 1024)
type Message = agentv1.Message
var validator protovalidate.Validator
func init() { var err error validator, err = protovalidate.New() if err != nil { panic(fmt.Errorf("failed to initialize protovalidate validator: %w", err)) }}
type Encoder struct { mu sync.Mutex w io.Writer}
func NewEncoder(w io.Writer) *Encoder { return &Encoder{w: w}}
func (e *Encoder) Encode(msg *Message) error { if err := validator.Validate(msg); err != nil { return fmt.Errorf("validate agent message: %w", err) }
data, err := proto.Marshal(msg) if err != nil { return fmt.Errorf("marshal agent message: %w", err) } if len(data) > MaxMessageBytes { return fmt.Errorf("agent message exceeded %d bytes", MaxMessageBytes) }
var header [4]byte binary.BigEndian.PutUint32(header[:], uint32(len(data)))
e.mu.Lock() defer e.mu.Unlock() if _, err := e.w.Write(header[:]); err != nil { return err } _, err = e.w.Write(data) return err}
type Decoder struct { r io.Reader}
func NewDecoder(r io.Reader) *Decoder { return &Decoder{r: r}}
func (d *Decoder) Decode() (*Message, error) { msg := &Message{} var header [4]byte if _, err := io.ReadFull(d.r, header[:]); err != nil { return msg, err }
size := binary.BigEndian.Uint32(header[:]) if size > MaxMessageBytes { return msg, fmt.Errorf("agent message exceeded %d bytes", MaxMessageBytes) }
data := make([]byte, size) if _, err := io.ReadFull(d.r, data); err != nil { return msg, err } if err := proto.Unmarshal(data, msg); err != nil { return msg, fmt.Errorf("parse agent message: %w", err) } if err := validator.Validate(msg); err != nil { return msg, fmt.Errorf("validate agent message: %w", err) } return msg, nil}