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caller_info.go
47 lines (41 loc) · 1.07 KB
/
caller_info.go
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package zzzlog
import (
"fmt"
"runtime"
"strings"
)
func callerInfo(skipFrames int) string {
frame, ok := callerFrame(skipFrames + 1)
if !ok {
return formatCallerInfo("UnknownFile", 0)
}
ix := strings.LastIndexByte(frame.File, '/')
if ix == -1 {
return formatCallerInfo(frame.File, frame.Line)
}
ix = strings.LastIndexByte(frame.File[:ix], '/')
if ix == -1 {
return formatCallerInfo(frame.File, frame.Line)
}
return formatCallerInfo(frame.File[ix+1:], frame.Line)
}
func formatCallerInfo(file string, line int) string {
caller := fmt.Sprintf("%s:%d", file, line)
callerLen := len(caller)
if callerLen > 30 {
return caller[callerLen-30:]
}
return caller
}
func callerFrame(skipFrames int) (runtime.Frame, bool) {
var frame runtime.Frame
pc := make([]uintptr, 1)
// We need to skip one frame to get this call site which invokes
// runtime.Callers(), hence one more than that is what we care.
numFrames := runtime.Callers(skipFrames+2, pc)
if numFrames < 1 {
return frame, false
}
frame, _ = runtime.CallersFrames(pc).Next()
return frame, frame.PC != 0
}