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|
package main
import (
"bufio"
"encoding/json"
"fmt"
"log"
"net"
"os"
"sync"
)
var storage struct {
sync.Mutex
messages []Message
}
func parseBuffer(previous []byte, new []byte) ([]Response, []byte) {
buf := append(previous, new...)
bufSize := uint32(len(buf))
var responses []Response
var idx uint32 = 0
for {
if idx+4 >= bufSize {
break
}
size := fromBytes(buf[idx : idx+4])
if size == 0 {
return responses, make([]byte, 0)
}
if idx+4+size >= bufSize {
break
} else {
resp, err := parseResponse(buf[idx+4 : idx+4+size])
if err == nil {
responses = append(responses, resp)
}
idx += 4 + size
}
}
return responses, buf[idx:]
}
func readResponse(conn net.Conn) (Response, error) {
var response Response
var err error
buf := make([]byte, 4096)
_, err = conn.Read(buf)
if err != nil {
return response, err
}
size := fromBytes(buf[:4])
rawResponse := buf[4 : size+4]
return parseResponse(rawResponse)
}
func main() {
var wg sync.WaitGroup
conn, err := net.Dial("tcp", "localhost:8080")
handleError(err)
defer conn.Close()
wg.Add(1)
go func(conn net.Conn) {
authMsg, _ := json.Marshal(Message{
Type: AUTHENTICATE,
Data: "auth",
User: "andrew",
})
_ = sendMessage(conn, authMsg)
reader := bufio.NewReader(os.Stdin)
for i := 0; i < 1000; i += 1 {
//fmt.Printf("Sending %d request\n", i)
line, _, _ := reader.ReadLine()
request, _ := json.Marshal(Message{
Type: MESSAGE,
//Data: fmt.Sprintf("Hello, %d", i),
Data: string(line),
User: "andrew",
})
err = sendMessage(conn, request)
if err != nil {
break
}
response, _ := readResponse(conn)
_ = fmt.Sprintf("%s", response)
}
exitMsg, _ := json.Marshal(Message{
Type: MESSAGE,
Data: "exit",
User: "andrew",
})
_ = sendMessage(conn, exitMsg)
fmt.Println("Closed connection")
wg.Done()
}(conn)
receiver, err := net.Dial("tcp", "localhost:8081")
handleError(err)
defer receiver.Close()
wg.Add(1)
go func(conn net.Conn) {
req := Message{
Type: AUTHENTICATE,
Data: AUTHENTICATE,
User: "andrew",
}
err = sendMessage(conn, []byte(req.serialize()))
if err != nil {
fmt.Println(err)
return
}
_, err := readResponse(conn)
if err != nil {
return
}
for {
response, err := readResponse(conn)
if err != nil {
break
}
message, err := parseMessage([]byte(response.Data))
if err == nil {
storage.Lock()
storage.messages = append(storage.messages, message)
fmt.Printf("Got message: \"%s\"\n", message.Data)
storage.Unlock()
} else {
fmt.Println(err)
}
req := Message{
Type: MESSAGE,
Data: SUCCESS,
User: "andrew",
}
_ = sendMessage(conn, []byte(req.serialize()))
}
wg.Done()
}(receiver)
wg.Wait()
}
func handleError(err error) {
if err != nil {
log.Fatal(err)
}
}
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