http_log_level.go

//
//    Copyright 2019 Insolar Technologies
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//

package log

import (
	"fmt"
	"github.com/insolar/insolar/insolar"
	"net/http"
)

// ServeHTTP is an HTTP handler that changes the global minimum log level
func NewLoglevelChangeHandler() http.Handler {
	handler := &loglevelChangeHandler{}
	return handler
}

type loglevelChangeHandler struct {
}

func (h *loglevelChangeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	values := r.URL.Query()
	levelStr := "(nil)"
	if values["level"] != nil {
		levelStr = values["level"][0]
	}
	level, err := insolar.ParseLevel(levelStr)
	if err != nil {
		w.WriteHeader(500)
		_, _ = fmt.Fprintf(w, "Invalid level '%v': %v\n", levelStr, err)
		return
	}

	err = SetGlobalLevelFilter(level)

	if err == nil {
		w.WriteHeader(200)
		_, _ = fmt.Fprintf(w, "New log level: '%v'\n", levelStr)
		return
	}

	w.WriteHeader(500)
	_, _ = fmt.Fprintf(w, "Logger doesn't support global log level(s): %v\n", err)
}