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package server
import (
"context"
"fmt"
"net/http"
"runtime"
"github.com/containers/libpod/pkg/api/handlers/utils"
log "github.com/sirupsen/logrus"
)
// APIHandler is a wrapper to enhance HandlerFunc's and remove redundant code
func (s *APIServer) APIHandler(h http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// http.Server hides panics, we want to see them and fix the cause.
defer func() {
err := recover()
if err != nil {
buf := make([]byte, 1<<20)
n := runtime.Stack(buf, true)
log.Warnf("Recovering from podman handler panic: %v, %s", err, buf[:n])
// Try to inform client things went south... won't work if handler already started writing response body
utils.InternalServerError(w, fmt.Errorf("%v", err))
}
}()
// Wrapper to hide some boiler plate
fn := func(w http.ResponseWriter, r *http.Request) {
// Connection counting, ugh. Needed to support the sliding window for idle checking.
s.ConnectionCh <- EnterHandler
defer func() { s.ConnectionCh <- ExitHandler }()
log.Debugf("APIHandler -- Method: %s URL: %s (conn %d/%d)",
r.Method, r.URL.String(), s.ActiveConnections, s.TotalConnections)
if err := r.ParseForm(); err != nil {
log.Infof("Failed Request: unable to parse form: %q", err)
}
// TODO: Use r.ConnContext when ported to go 1.13
c := context.WithValue(r.Context(), "decoder", s.Decoder)
c = context.WithValue(c, "runtime", s.Runtime)
c = context.WithValue(c, "shutdownFunc", s.Shutdown)
r = r.WithContext(c)
h(w, r)
}
fn(w, r)
}
}
// VersionedPath prepends the version parsing code
// any handler may override this default when registering URL(s)
func VersionedPath(p string) string {
return "/v{version:[0-9][0-9.]*}" + p
}
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