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irc_server_for_test.go
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irc_server_for_test.go
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bufio"
"errors"
"fmt"
"io"
"net"
"strings"
"sync"
"testing"
irc "github.com/fluffle/goirc/client"
"github.com/google/alertmanager-irc-relay/logging"
)
type LineHandlerFunc func(*bufio.ReadWriter, *irc.Line) error
func hJOIN(conn *bufio.ReadWriter, line *irc.Line) error {
r := fmt.Sprintf(":foo!foo@example.com JOIN :%s\n", line.Args[0])
_, err := conn.WriteString(r)
return err
}
func hUSER(conn *bufio.ReadWriter, line *irc.Line) error {
r := fmt.Sprintf(":example.com 001 %s :Welcome\n", line.Args[0])
_, err := conn.WriteString(r)
return err
}
func hQUIT(conn *bufio.ReadWriter, line *irc.Line) error {
return fmt.Errorf("client asked to terminate")
}
type closeEarlyHandler func()
type testServer struct {
net.Listener
Client net.Conn
ServingWaitGroup sync.WaitGroup
ConnectionsWaitGroup sync.WaitGroup
lineHandlersMu sync.Mutex
lineHandlers map[string]LineHandlerFunc
Log []string
closeEarlyMu sync.Mutex
closeEarlyHandler
}
func (s *testServer) setDefaultHandlers() {
if s.lineHandlers == nil {
s.lineHandlers = make(map[string]LineHandlerFunc)
}
s.lineHandlers["JOIN"] = hJOIN
s.lineHandlers["USER"] = hUSER
s.lineHandlers["QUIT"] = hQUIT
}
func (s *testServer) getHandler(cmd string) LineHandlerFunc {
s.lineHandlersMu.Lock()
defer s.lineHandlersMu.Unlock()
return s.lineHandlers[cmd]
}
func (s *testServer) SetHandler(cmd string, h LineHandlerFunc) {
s.lineHandlersMu.Lock()
defer s.lineHandlersMu.Unlock()
if h == nil {
delete(s.lineHandlers, cmd)
} else {
s.lineHandlers[cmd] = h
}
}
func (s *testServer) handleLine(conn *bufio.ReadWriter, line *irc.Line) error {
s.Log = append(s.Log, strings.Trim(line.Raw, " \r\n"))
handler := s.getHandler(line.Cmd)
if handler == nil {
logging.Info("=Server= No handler for command '%s', skipping", line.Cmd)
return nil
}
return handler(conn, line)
}
func (s *testServer) handleConnection(conn net.Conn) {
defer func() {
s.Client = nil
conn.Close()
s.ConnectionsWaitGroup.Done()
}()
bufConn := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
for {
msg, err := bufConn.ReadBytes('\n')
if err != nil {
if err == io.EOF {
logging.Info("=Server= Client %s disconnected", conn.RemoteAddr().String())
} else {
logging.Info("=Server= Could not read from %s: %s", conn.RemoteAddr().String(), err)
}
return
}
logging.Info("=Server= Received %s", msg)
line := irc.ParseLine(string(msg))
if line == nil {
logging.Error("=Server= Could not parse received line")
continue
}
err = s.handleLine(bufConn, line)
if err != nil {
logging.Info("=Server= Closing connection: %s", err)
return
}
bufConn.Flush()
}
}
func (s *testServer) SendMsg(msg string) error {
if s.Client == nil {
return errors.New("Cannot write without client connected")
}
bufConn := bufio.NewWriter(s.Client)
logging.Info("=Server= sending to client: %s", msg)
_, err := bufConn.WriteString(msg)
bufConn.Flush()
return err
}
func (s *testServer) SetCloseEarly(h closeEarlyHandler) {
s.closeEarlyMu.Lock()
defer s.closeEarlyMu.Unlock()
s.closeEarlyHandler = h
}
func (s *testServer) handleCloseEarly(conn net.Conn) bool {
s.closeEarlyMu.Lock()
defer s.closeEarlyMu.Unlock()
if s.closeEarlyHandler == nil {
return false
}
logging.Info("=Server= Closing connection early")
conn.Close()
s.closeEarlyHandler()
return true
}
func (s *testServer) Serve() {
defer s.ServingWaitGroup.Done()
for {
conn, err := s.Listener.Accept()
if err != nil {
logging.Info("=Server= Stopped accepting new connections")
return
}
logging.Info("=Server= New client connected from %s", conn.RemoteAddr().String())
if s.handleCloseEarly(conn) {
continue
}
s.Client = conn
s.ConnectionsWaitGroup.Add(1)
s.handleConnection(conn)
}
}
func (s *testServer) Stop() {
s.Listener.Close()
s.ServingWaitGroup.Wait()
s.ConnectionsWaitGroup.Wait()
}
func makeTestServer(t *testing.T) (*testServer, int) {
server := new(testServer)
server.Log = make([]string, 0)
server.setDefaultHandlers()
addr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("=Server= Could not resolve tcp addr: %s", err)
}
listener, err := net.ListenTCP("tcp", addr)
if err != nil {
t.Fatalf("=Server= Could not create listener: %s", err)
}
addr = listener.Addr().(*net.TCPAddr)
logging.Info("=Server= Test server listening on %s", addr.String())
server.Listener = listener
server.ServingWaitGroup.Add(1)
go func() {
server.Serve()
}()
addr = listener.Addr().(*net.TCPAddr)
return server, addr.Port
}