/
handshake_response.go
54 lines (44 loc) · 1.08 KB
/
handshake_response.go
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package rpc
import (
"bytes"
"errors"
"fmt"
)
type HandshakeResponse struct {
Type []byte
Flags []byte
SenderPID []byte
PeerPID []byte
}
// Bytes returns a serialized handshake response.
func (r *HandshakeResponse) Bytes() []byte {
buf := &bytes.Buffer{}
buf.Write(r.Type)
buf.Write(r.Flags)
buf.Write(r.SenderPID)
buf.Write(r.PeerPID)
return buf.Bytes()
}
// Valid checks that handshake response compliments request.
func (r *HandshakeResponse) Valid() error {
if !bytes.Equal(r.Type, TagHandshake) {
return errors.New("unexpected handshake tag")
}
if !bytes.Equal(r.PeerPID, HandshakeSenderPID) {
return errors.New("incorrect sender PID")
}
return nil
}
// NewHandshakeResponse constructs new handshake response from the given
// data.
func NewHandshakeResponse(data []byte) (*HandshakeResponse, error) {
if len(data) != 32 { //nolint: gomnd
return nil, fmt.Errorf("incorrect handshake response length %d", len(data))
}
return &HandshakeResponse{
Type: data[:4],
Flags: data[4:8],
SenderPID: data[8:20],
PeerPID: data[20:],
}, nil
}