/
session.go
155 lines (140 loc) · 2.89 KB
/
session.go
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package message
import (
"bufio"
"errors"
"fmt"
"io"
"log"
"net"
"github.com/vmihailenco/msgpack/v5"
"github.com/vmihailenco/msgpack/v5/msgpcode"
)
type Step int
const (
WatingForHelo Step = iota
WaitingForPing
WaitingForPong
WaitingForEvents
)
type PasswordForKey func(string) string
type FluentSession struct {
nonce []byte
hashSalt []byte
encoder *msgpack.Encoder
decoder *msgpack.Decoder
Reader *FluentReader
SharedKey string
step Step
Hostname string
PasswordForKey PasswordForKey
flusher Flusher
Logger *log.Logger
Users func(string) []byte
Debug bool
}
type Flusher interface {
Flush() error
}
func (s *FluentSession) Flush() error {
return s.flusher.Flush()
}
func (s *FluentSession) debug(v ...interface{}) {
if s.Debug {
log.Println("🐞", fmt.Sprint(v...))
}
}
func (s *FluentSession) Loop(conn io.ReadWriteCloser) error {
defer conn.Close()
bufferedWriter := bufio.NewWriter(conn)
s.flusher = bufferedWriter
s.decoder = msgpack.NewDecoder(conn)
s.encoder = msgpack.NewEncoder(bufferedWriter)
//s.encoder.UseCompactInts(true)
//s.encoder.UseCompactFloats(true)
if s.SharedKey == "" {
s.step = WaitingForEvents
} else {
s.step = WatingForHelo
}
for {
err := s.handleMessage()
if err != nil {
var client string
nconn, ok := conn.(net.Conn)
if ok {
client = nconn.RemoteAddr().String()
} else {
client = ""
}
if err == io.EOF {
s.Logger.Println("Connection closed", client)
return nil
}
s.Logger.Println("Error : ", err, client)
conn.Close()
return err
}
}
}
func (s *FluentSession) handleMessage() error {
if s.step == WatingForHelo {
return s.doHelo()
}
code, err := s.decoder.PeekCode()
if err != nil {
return err
}
if code == msgpcode.Nil {
return s.HandleHearthBeat()
}
if !msgpcode.IsFixedArray(code) {
return fmt.Errorf("unexpected code %v", code)
}
l, err := s.decoder.DecodeArrayLen()
if err != nil {
return err
}
if l == 0 {
return errors.New("empty array")
}
_type, err := s.decoder.DecodeString()
if err != nil {
return err
}
s.Logger.Printf("Type : [%s]\n", _type)
switch s.step {
case WaitingForPing:
if _type != "PING" {
return fmt.Errorf("waiting for a ping not %s", _type)
}
return s.handlePing(l, _type)
case WaitingForEvents:
defer fmt.Println("Events")
return s.HandleEvents(l, _type)
default:
return fmt.Errorf("unknown step : %v", s.step)
}
}
func (s *FluentSession) HandleHearthBeat() error {
err := s.decoder.DecodeNil()
if err != nil {
return err
}
s.Logger.Println("Hearthbeat")
/*
err = s.encoder.EncodeNil()
if err != nil {
return err
}
*/
return nil
}
func (s *FluentSession) HandleEvents(l int, _type string) error {
if l > 5 {
return errors.New("flood")
}
if l < 2 {
return errors.New("too short")
}
return s.decodeMessages(_type, l)
}