How Can I Get Caller Function Information in Golang?

Retrieving Caller Function Information in Golang

In Golang, it's possible to obtain insights into the caller function. Consider the following code snippet:

func foo() {
    // Do something
}

func main() {
    foo()
}

The question arises: how can we determine that foo was invoked from main? Other languages, such as C#, facilitate this task using attributes like CallerMemberName.

Thankfully, Golang provides a solution with the runtime.Caller function.

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

Example Implementations

Example #1: Printing Caller File Name and Line Number

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: Retrieving More Information with runtime.FuncForPC

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()
}

By utilizing these examples, you can effortlessly gain insights into caller function information in Go.

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