/
middleware.go
65 lines (56 loc) · 1.64 KB
/
middleware.go
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package server
import (
"fmt"
"net/http"
"runtime/debug"
"gopkg.in/Clever/kayvee-go.v6/logger"
)
// PanicMiddleware logs any panics. For now, we're continue throwing the panic up
// the stack so this may crash the process.
func PanicMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
panicErr := recover()
if panicErr == nil {
return
}
var err error
switch panicErr := panicErr.(type) {
case string:
err = fmt.Errorf(panicErr)
case error:
err = panicErr
default:
err = fmt.Errorf("unknown panic %#v of type %T", panicErr, panicErr)
}
logger.FromContext(r.Context()).ErrorD("panic",
logger.M{"err": err, "stacktrace": string(debug.Stack())})
panic(panicErr)
}()
h.ServeHTTP(w, r)
})
}
// statusResponseWriter wraps a response writer
type statusResponseWriter struct {
http.ResponseWriter
status int
}
func (s *statusResponseWriter) WriteHeader(code int) {
s.status = code
s.ResponseWriter.WriteHeader(code)
}
// VersionRange decides whether to accept a version.
type VersionRange func(version string) bool
// ClientVersionCheckMiddleware checks the client version.
func ClientVersionCheckMiddleware(h http.Handler, rng VersionRange) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
version := r.Header.Get("X-Client-Version")
logger.FromContext(r.Context()).AddContext("client-version", version)
if !rng(version) {
w.WriteHeader(400)
w.Write([]byte(fmt.Sprintf(`{"message": "client version '%s' not accepted, please upgrade"}`, version)))
return
}
h.ServeHTTP(w, r)
})
}