// Error is an error/panic handler middleware.
// Any error/panic is recovered and logged and the error response is returned to the user (auto-generated if none was set).
func Error(ctx *neptulon.ReqCtx) error {
errored := false
if err := ctx.Next(); err != nil {
errored = true
log.Printf("mw: error: error handling response: %v", err)
}
if err := recover(); err != nil {
errored = true
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
log.Printf("mw: error: panic handling response: %v\nstack trace: %s", err, buf)
}
if errored {
if ctx.Err == nil {
ctx.Err = &neptulon.ResError{
Code: 500,
Message: "Internal server error.",
}
}
return ctx.Next()
}
return nil
}
// Echo sends incoming messages back as is.
func Echo(ctx *neptulon.ReqCtx) error {
// unmarshall incoming message into response directly
if err := ctx.Params(&ctx.Res); err != nil {
return err
}
return ctx.Next()
}
// Middleware is the Neptulon middleware method.
func (r *Router) Middleware(ctx *neptulon.ReqCtx) error {
if handler, ok := r.routes[ctx.Method]; ok {
return handler(ctx)
}
return ctx.Next()
}
// Logger is an incoming/outgoing message logger.
func Logger(ctx *neptulon.ReqCtx) error {
var v interface{}
ctx.Params(&v)
err := ctx.Next()
var res interface{}
if res = ctx.Session.Get(CustResLogDataKey); res == nil {
res = ctx.Res
if res == nil {
res = ctx.Err
}
}
log.Printf("mw: logger: %v: %v, in: \"%v\", out: \"%#v\"", ctx.ID, ctx.Method, v, res)
return err
}
// CertAtuh is TLS client-certificate authentication.
// If successful, certificate common name will stored with the key "userid" in session.
// If unsuccessful, connection will be closed right away.
func CertAtuh(ctx *neptulon.ReqCtx) error {
if _, ok := ctx.Session.GetOk("userid"); ok {
return ctx.Next()
}
// if provided, client certificate is verified by the TLS listener so the peerCerts list in the connection is trusted
// connState, _ := ctx.Conn.ConnectionState()
// certs := connState.PeerCertificates
// if len(certs) == 0 {
// log.Println("Invalid client-certificate authentication attempt:", ctx.Conn.RemoteAddr())
// ctx.Conn.Close()
// return nil
// }
//
// userID := certs[0].Subject.CommonName
// ctx.Session.Set("userid", userID)
// log.Printf("Client authenticated. TLS/IP: %v, User ID: %v, Conn ID: %v\n", ctx.Conn.RemoteAddr(), userID, ctx.Conn.ID)
return ctx.Next()
}
// Middleware registers a queue middleware to register user/connection IDs
// for connecting users (upon their first incoming-message).
func (q *Queue) Middleware(ctx *neptulon.ReqCtx) error {
q.SetConn(ctx.Conn.Session.Get("userid").(string), ctx.Conn.ID)
return ctx.Next()
}
// Middleware registers a queue middleware to register user/connection IDs
// for connecting users (upon their first incoming-message).
func (q *Queue) Middleware(ctx *neptulon.ReqCtx) error {
q.middlewareChan <- middlewareChan{userID: ctx.Conn.Session.Get("userid").(string), connID: ctx.Conn.ID}
return ctx.Next()
}