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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"github.com/bbeck/protohackers/internal"
"io"
"net"
"sync"
)
func main() {
var room Room
internal.RunTCPServer(func(conn net.Conn) {
defer conn.Close()
scanner := bufio.NewScanner(conn)
// Read name
io.WriteString(conn, "Name:\n")
if !scanner.Scan() {
return
}
name := scanner.Text()
if !IsValidName(name) {
return
}
// Join the room
room.Join(name, conn)
defer room.Part(name)
// Now that the user is connected keep sending their messages until
// they disconnect
for scanner.Scan() {
room.Send(name, scanner.Text())
}
})
}
func IsValidName(name string) bool {
for _, r := range name {
isValid := ('a' <= r && r <= 'z') || ('A' <= r && r <= 'Z') || ('0' <= r && r <= '9')
if !isValid {
return false
}
}
return len(name) > 0
}
type Room struct {
sync.Mutex
Members map[string]net.Conn
}
func (r *Room) Join(name string, conn net.Conn) {
r.Lock()
defer r.Unlock()
r.send(name, fmt.Sprintf("* %s joined\n", name))
io.WriteString(conn, fmt.Sprintf("* members: %v\n", r.Members))
if r.Members == nil {
r.Members = make(map[string]net.Conn)
}
r.Members[name] = conn
}
func (r *Room) Part(name string) {
r.Lock()
defer r.Unlock()
delete(r.Members, name)
r.send(name, fmt.Sprintf("* %s left\n", name))
}
func (r *Room) Send(name, message string) {
r.Lock()
defer r.Unlock()
r.send(name, fmt.Sprintf("[%s] %s\n", name, message))
}
func (r *Room) send(name, msg string) {
for m, conn := range r.Members {
if m == name {
continue
}
io.WriteString(conn, msg)
}
}