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108 lines
2.3 KiB
Go
108 lines
2.3 KiB
Go
package main
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import (
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"crypto/rsa"
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"encoding/json"
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"fmt"
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"io"
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"net"
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)
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func stream(r io.Reader, c chan Envelope, e chan error, done chan interface{}) {
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defer close(done)
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decoder := json.NewDecoder(r)
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var env Envelope
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for {
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err := decoder.Decode(&env)
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switch err {
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case io.EOF:
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return
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case nil:
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c <- env
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default:
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e <- err
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}
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}
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}
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type serverConnection struct {
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conn net.Conn
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nick string
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key rsa.PublicKey
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}
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func (s *serverConnection) sendMeta(template string, args ...interface{}) {
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m := Meta(fmt.Sprintf(template, args...))
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if err := s.sendRequest(m); err != nil {
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error_log.Printf("error sending message to client: %v", err)
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}
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}
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func (s *serverConnection) sendRequest(r request) error {
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return writeRequest(s.conn, r)
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}
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func (s *serverConnection) handleRequest(request Envelope) error {
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switch request.Kind {
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case "auth":
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return s.handleAuthRequest(request.Body)
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default:
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return fmt.Errorf("no such request type: %v", request.Kind)
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}
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}
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func (s *serverConnection) handleAuthRequest(body json.RawMessage) error {
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var auth Auth
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if err := json.Unmarshal(body, &auth); err != nil {
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return fmt.Errorf("bad auth request: %v", err)
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}
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s.nick = auth.Nick
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s.key = auth.Key
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s.sendMeta("hello, %s", auth.Nick)
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info_log.Printf("authenticated user %s", auth.Nick)
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return nil
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}
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func (s *serverConnection) run() {
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defer func() {
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s.conn.Close()
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info_log.Printf("connection ended: %v", s.conn.RemoteAddr())
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}()
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info_log.Printf("connection start: %v", s.conn.RemoteAddr())
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requests := make(chan Envelope)
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errors := make(chan error)
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done := make(chan interface{})
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go stream(s.conn, requests, errors, done)
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for {
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select {
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case request := <-requests:
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if err := s.handleRequest(request); err != nil {
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error_log.Printf("client error: %v", err)
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}
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case err := <-errors:
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error_log.Printf("connection error: %v", err)
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case <-done:
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return
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}
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}
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}
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func serve() {
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listener, err := net.Listen("tcp", fmt.Sprintf(":%d", options.port))
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if err != nil {
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exit(1, "couldn't open tcp port for listening: %v", err)
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}
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info_log.Printf("server listening: %s:%d", options.host, options.port)
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for {
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conn, err := listener.Accept()
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if err != nil {
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error_log.Printf("error accepting new connection: %v", err)
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continue
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}
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srvConn := serverConnection{
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conn: conn,
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}
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go srvConn.run()
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}
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}
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