94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package naming
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import (
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"fmt"
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"regexp"
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goruntime "runtime"
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"runtime/debug"
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"strconv"
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"strings"
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)
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// GetNameFromCallsite walks back through the call stack until we find a caller from outside of the ignoredPackages
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// it returns back a shortpath/filename:line to aid in identification of this reflector when it starts logging
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func GetNameFromCallsite(ignoredPackages ...string) string {
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name := "????"
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const maxStack = 10
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for i := 1; i < maxStack; i++ {
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_, file, line, ok := goruntime.Caller(i)
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if !ok {
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file, line, ok = extractStackCreator()
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if !ok {
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break
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}
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i += maxStack
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}
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if hasPackage(file, append(ignoredPackages, "/runtime/asm_")) {
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continue
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}
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file = trimPackagePrefix(file)
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name = fmt.Sprintf("%s:%d", file, line)
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break
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}
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return name
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}
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// hasPackage returns true if the file is in one of the ignored packages.
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func hasPackage(file string, ignoredPackages []string) bool {
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for _, ignoredPackage := range ignoredPackages {
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if strings.Contains(file, ignoredPackage) {
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return true
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}
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}
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return false
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}
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// trimPackagePrefix reduces duplicate values off the front of a package name.
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func trimPackagePrefix(file string) string {
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if l := strings.LastIndex(file, "/vendor/"); l >= 0 {
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return file[l+len("/vendor/"):]
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}
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if l := strings.LastIndex(file, "/src/"); l >= 0 {
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return file[l+5:]
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}
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if l := strings.LastIndex(file, "/pkg/"); l >= 0 {
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return file[l+1:]
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}
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return file
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}
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var stackCreator = regexp.MustCompile(`(?m)^created by (.*)\n\s+(.*):(\d+) \+0x[[:xdigit:]]+$`)
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// extractStackCreator retrieves the goroutine file and line that launched this stack. Returns false
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// if the creator cannot be located.
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// TODO: Go does not expose this via runtime https://github.com/golang/go/issues/11440
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func extractStackCreator() (string, int, bool) {
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stack := debug.Stack()
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matches := stackCreator.FindStringSubmatch(string(stack))
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if matches == nil || len(matches) != 4 {
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return "", 0, false
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}
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line, err := strconv.Atoi(matches[3])
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if err != nil {
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return "", 0, false
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}
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return matches[2], line, true
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}
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