/
server.go
93 lines (77 loc) · 2.16 KB
/
server.go
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package chattp2
import (
"context"
"encoding/json"
"flag"
"fmt"
"log"
"net/http"
"golang.org/x/net/http2"
)
// Server represents the chattp2 server, a chat server based on HTTP2
type Server struct {
httpServer *http.Server
msgsChan map[string]chan string
}
// NewServer returns a new chattp2 Server
func NewServer() (*Server, error) {
var srv http.Server
flag.BoolVar(&http2.VerboseLogs, "verbose", false, "Verbose HTTP/2 debugging.")
flag.Parse()
srv.Addr = "localhost:4430"
// srv.ConnState = idleTimeoutHook()
return &Server{
httpServer: &srv,
msgsChan: make(map[string]chan string),
}, nil
}
// Run chattp2 server. Server is listening for client connections
func (s *Server) Run(ctx context.Context) {
http.HandleFunc("/connect", s.connectHandler)
http.HandleFunc("/send", s.sendHandler)
_ = http2.ConfigureServer(s.httpServer, &http2.Server{})
go func() {
log.Printf("chattp2 server listening in %s", s.httpServer.Addr)
log.Fatal(s.httpServer.ListenAndServeTLS("server.crt", "server.key"))
}()
select {}
}
func (s *Server) connectHandler(w http.ResponseWriter, r *http.Request) {
user := r.URL.Query().Get("user")
if user == "" {
log.Println("Empty user...")
w.WriteHeader(http.StatusBadRequest)
return
}
if _, ok := s.msgsChan[user]; ok {
log.Printf("User `%s` already exists.", user)
w.WriteHeader(http.StatusBadRequest)
return
}
s.msgsChan[user] = make(chan string) // Initialize user channel
w.Header().Set("Content-Type", "application/json; charset=utf-8")
clientGone := w.(http.CloseNotifier).CloseNotify()
for {
select {
case msg := <-s.msgsChan[user]:
// wait for messages...
fmt.Fprintln(w, msg)
w.(http.Flusher).Flush()
case <-clientGone:
log.Printf("Client %v disconnected", r.RemoteAddr)
delete(s.msgsChan, user)
return
}
}
}
func (s *Server) sendHandler(w http.ResponseWriter, r *http.Request) {
var msg Message
_ = json.NewDecoder(r.Body).Decode(&msg)
if _, ok := s.msgsChan[msg.Receiver]; !ok {
log.Printf("User `%s` doesn't exists.", msg.Receiver)
w.WriteHeader(http.StatusBadRequest)
return
}
s.msgsChan[msg.Receiver] <- msg.Sender + ": " + msg.Content
w.WriteHeader(http.StatusOK)
}