How Can I Get Caller Information in Go?

Obtaining Caller Information in GoLang

Is it feasible to determine information about the function that invoked another function in GoLang? If a function, such as foo() below, is called from main(), how can we find out?

func foo() {
    // Perform some actions
}

func main() {
    foo()
}

While some languages, such as C#, provide features like the CallerMemberName attribute to retrieve this data, GoLang employs a different approach.

Solution: runtime.Caller

GoLang offers the runtime.Caller function for acquiring information about the caller. Here's its syntax:

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

Example 1: Displaying 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: Gathering Detailed Information with runtime.FuncForPC

For more comprehensive information, you can use runtime.FuncForPC in conjunction with runtime.Caller:

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()
}

The above is the detailed content of How Can I Get Caller Information in Go?. For more information, please follow other related articles on the PHP Chinese website!