Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/k8s.io/apimachinery/pkg/util/naming/from_stack.go b/vendor/k8s.io/apimachinery/pkg/util/naming/from_stack.go
new file mode 100644
index 0000000..2965d5a
--- /dev/null
+++ b/vendor/k8s.io/apimachinery/pkg/util/naming/from_stack.go
@@ -0,0 +1,93 @@
+/*
+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.
+*/
+
+package naming
+
+import (
+ "fmt"
+ "regexp"
+ goruntime "runtime"
+ "runtime/debug"
+ "strconv"
+ "strings"
+)
+
+// 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
+ }
+
+ file = trimPackagePrefix(file)
+ name = fmt.Sprintf("%s:%d", file, line)
+ break
+ }
+ return name
+}
+
+// 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
+}
+
+// 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
+}
+
+var stackCreator = regexp.MustCompile(`(?m)^created by (.*)\n\s+(.*):(\d+) \+0x[[:xdigit:]]+$`)
+
+// 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
+}