Is it possible get information about caller function in Golang?

Question

Is it possible get information about caller function in Golang? For example if I have

func foo() {     //Do something } func main() {     foo()  } 

How can I get that foo has been called from main?
I'm able to this in other language (for example in C# I just need to use CallerMemberName class attribute)

Answer 1

You can use runtime.Caller for easily retrieving information about the caller:

func Caller(skip int) (pc uintptr, file string, line int, ok bool) 

---

Example #1: Print caller file name and line number: https://play.golang.org/p/cdO4Z4ApHS

package main  import (     "fmt"     "runtime" )  func foo() {     _, file, no, ok := runtime.Caller(1)     if ok {         fmt.Printf("called from %s#%d\n", file, no)     } }  func main() {     foo() } 

---

Example #2: Get more information with runtime.FuncForPC: https://play.golang.org/p/y8mpQq2mAv

package main  import (     "fmt"     "runtime" )  func foo() {     pc, _, _, ok := runtime.Caller(1)     details := runtime.FuncForPC(pc)     if ok && details != nil {         fmt.Printf("called from %s\n", details.Name())     } }  func main() {     foo() } 

Answer 2

expanding on my comment, here's some code that returns the current func's caller

import(     "fmt"     "runtime" )  func getFrame(skipFrames int) runtime.Frame {     // We need the frame at index skipFrames+2, since we never want runtime.Callers and getFrame     targetFrameIndex := skipFrames + 2      // Set size to targetFrameIndex+2 to ensure we have room for one more caller than we need     programCounters := make([]uintptr, targetFrameIndex+2)     n := runtime.Callers(0, programCounters)      frame := runtime.Frame{Function: "unknown"}     if n > 0 {         frames := runtime.CallersFrames(programCounters[:n])         for more, frameIndex := true, 0; more && frameIndex <= targetFrameIndex; frameIndex++ {             var frameCandidate runtime.Frame             frameCandidate, more = frames.Next()             if frameIndex == targetFrameIndex {                 frame = frameCandidate             }         }     }      return frame }  // MyCaller returns the caller of the function that called it :) func MyCaller() string {         // Skip GetCallerFunctionName and the function to get the caller of         return getFrame(2).Function }  // foo calls MyCaller func foo() {     fmt.Println(MyCaller()) }  // bar is what we want to see in the output - it is our "caller" func bar() {     foo() }  func main(){     bar() } 

For more examples: https://play.golang.org/p/cv-SpkvexuM