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name runtime.Schemes so we can see which one fails
Kubernetes-commit: 340802b079dbf8d193f162d49663679bd7d24ef7
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Original file line number | Diff line number | Diff line change |
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/* | ||
Copyright 2018 The Kubernetes 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. | ||
*/ | ||
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package naming | ||
|
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import ( | ||
"fmt" | ||
"regexp" | ||
goruntime "runtime" | ||
"runtime/debug" | ||
"strconv" | ||
"strings" | ||
) | ||
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// GetNameFromCallsite walks back through the call stack until we find a caller from outside of the ignoredPackages | ||
// it returns back a shortpath/filename:line to aid in identification of this reflector when it starts logging | ||
func GetNameFromCallsite(ignoredPackages ...string) string { | ||
name := "????" | ||
const maxStack = 10 | ||
for i := 1; i < maxStack; i++ { | ||
_, file, line, ok := goruntime.Caller(i) | ||
if !ok { | ||
file, line, ok = extractStackCreator() | ||
if !ok { | ||
break | ||
} | ||
i += maxStack | ||
} | ||
if hasPackage(file, append(ignoredPackages, "/runtime/asm_")) { | ||
continue | ||
} | ||
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file = trimPackagePrefix(file) | ||
name = fmt.Sprintf("%s:%d", file, line) | ||
break | ||
} | ||
return name | ||
} | ||
|
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// hasPackage returns true if the file is in one of the ignored packages. | ||
func hasPackage(file string, ignoredPackages []string) bool { | ||
for _, ignoredPackage := range ignoredPackages { | ||
if strings.Contains(file, ignoredPackage) { | ||
return true | ||
} | ||
} | ||
return false | ||
} | ||
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// trimPackagePrefix reduces duplicate values off the front of a package name. | ||
func trimPackagePrefix(file string) string { | ||
if l := strings.LastIndex(file, "/vendor/"); l >= 0 { | ||
return file[l+len("/vendor/"):] | ||
} | ||
if l := strings.LastIndex(file, "/src/"); l >= 0 { | ||
return file[l+5:] | ||
} | ||
if l := strings.LastIndex(file, "/pkg/"); l >= 0 { | ||
return file[l+1:] | ||
} | ||
return file | ||
} | ||
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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 | ||
// if the creator cannot be located. | ||
// TODO: Go does not expose this via runtime https://github.com/golang/go/issues/11440 | ||
func extractStackCreator() (string, int, bool) { | ||
stack := debug.Stack() | ||
matches := stackCreator.FindStringSubmatch(string(stack)) | ||
if matches == nil || len(matches) != 4 { | ||
return "", 0, false | ||
} | ||
line, err := strconv.Atoi(matches[3]) | ||
if err != nil { | ||
return "", 0, false | ||
} | ||
return matches[2], line, true | ||
} |
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