func runHandler(resp http.ResponseWriter, req *http.Request,
fn func(resp http.ResponseWriter, req *http.Request) error, errfn httputil.Error) {
defer func() {
if rv := recover(); rv != nil {
err := errors.New("handler panic")
logError(req, err, rv)
errfn(resp, req, http.StatusInternalServerError, err)
}
}()
if s := req.Header.Get("X-Real-Ip"); s != "" && httputil.StripPort(req.RemoteAddr) == "127.0.0.1" {
req.RemoteAddr = s
}
req.Body = http.MaxBytesReader(resp, req.Body, 2048)
req.ParseForm()
var rb httputil.ResponseBuffer
err := fn(&rb, req)
if err == nil {
rb.WriteTo(resp)
} else if e, ok := err.(*httpError); ok {
if e.status >= 500 {
logError(req, err, nil)
}
errfn(resp, req, e.status, e.err)
} else {
logError(req, err, nil)
errfn(resp, req, http.StatusInternalServerError, err)
}
}
func isRobot(req *http.Request) bool {
if robotPat.MatchString(req.Header.Get("User-Agent")) {
return true
}
host := httputil.StripPort(req.RemoteAddr)
n, err := db.IncrementCounter(host, 1)
if err != nil {
log.Printf("error incrementing counter for %s, %v\n", host, err)
return false
}
if n > *robot {
log.Printf("robot %.2f %s %s", n, host, req.Header.Get("User-Agent"))
return true
}
return false
}