// Init a new Server object
func New() *Server {
// TODO is two filestores better/worse than sharing w/ smtpd?
ds := smtpd.DefaultFileDataStore()
cfg := config.GetPop3Config()
return &Server{domain: cfg.Domain, dataStore: ds, maxIdleSeconds: cfg.MaxIdleSeconds,
waitgroup: new(sync.WaitGroup)}
}
func RootStatus(w http.ResponseWriter, req *http.Request, ctx *Context) (err error) {
retentionMinutes := config.GetDataStoreConfig().RetentionMinutes
smtpListener := fmt.Sprintf("%s:%d", config.GetSmtpConfig().Ip4address.String(),
config.GetSmtpConfig().Ip4port)
pop3Listener := fmt.Sprintf("%s:%d", config.GetPop3Config().Ip4address.String(),
config.GetPop3Config().Ip4port)
webListener := fmt.Sprintf("%s:%d", config.GetWebConfig().Ip4address.String(),
config.GetWebConfig().Ip4port)
return RenderTemplate("root/status.html", w, map[string]interface{}{
"ctx": ctx,
"version": config.VERSION,
"buildDate": config.BUILD_DATE,
"retentionMinutes": retentionMinutes,
"smtpListener": smtpListener,
"pop3Listener": pop3Listener,
"webListener": webListener,
})
}
// Main listener loop
func (s *Server) Start() {
cfg := config.GetPop3Config()
addr, err := net.ResolveTCPAddr("tcp4", fmt.Sprintf("%v:%v",
cfg.Ip4address, cfg.Ip4port))
if err != nil {
log.LogError("POP3 Failed to build tcp4 address: %v", err)
// TODO More graceful early-shutdown procedure
panic(err)
}
log.LogInfo("POP3 listening on TCP4 %v", addr)
s.listener, err = net.ListenTCP("tcp4", addr)
if err != nil {
log.LogError("POP3 failed to start tcp4 listener: %v", err)
// TODO More graceful early-shutdown procedure
panic(err)
}
// Handle incoming connections
var tempDelay time.Duration
for sid := 1; ; sid++ {
if conn, err := s.listener.Accept(); err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Temporary() {
// Temporary error, sleep for a bit and try again
if tempDelay == 0 {
tempDelay = 5 * time.Millisecond
} else {
tempDelay *= 2
}
if max := 1 * time.Second; tempDelay > max {
tempDelay = max
}
log.LogError("POP3 accept error: %v; retrying in %v", err, tempDelay)
time.Sleep(tempDelay)
continue
} else {
if s.shutdown {
log.LogTrace("POP3 listener shutting down on request")
return
}
// TODO Implement a max error counter before shutdown?
// or maybe attempt to restart POP3
panic(err)
}
} else {
tempDelay = 0
s.waitgroup.Add(1)
go s.startSession(sid, conn)
}
}
}