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debug.go
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debug.go
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// Copyright 2016 The fleet Authors
//
// 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 debug
import (
"crypto/rand"
"encoding/hex"
"fmt"
"net/http"
"regexp"
"runtime"
"strings"
)
var Enabled bool
func init() {
Enabled = true
}
func Start(addr string) {
go http.ListenAndServe(addr, nil)
}
func RegisterHTTPHandler(pattern string, handler http.Handler) {
if Enabled {
http.Handle(pattern, handler)
}
}
func genRandomID() string {
c := 5
b := make([]byte, c)
_, err := rand.Read(b)
if err != nil {
panic(err)
}
return hex.EncodeToString(b)
}
func Enter_(args ...interface{}) string {
pc, _, _, _ := runtime.Caller(1)
functionObject := runtime.FuncForPC(pc)
extractFnName := regexp.MustCompile(`^.*\/(.*)$`)
fnName := extractFnName.ReplaceAllString(functionObject.Name(), "$1")
argsStr := make([]string, len(args))
for idx, arg := range args {
argsStr[idx] = fmt.Sprintf("%+v", arg)
}
fnWithId := genRandomID() + " " + fnName
fmt.Printf("==> %s(%s)\n", fnWithId, strings.Join(argsStr, ","))
return fnWithId
}
func Exit_(fnName string) {
fmt.Printf("<== %s\n", fnName)
}