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utils.go
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/
utils.go
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package errors
import (
"fmt"
"runtime"
)
// getFrame returns the stack frame at index i the moment it was called.
// It automatically discards its own frame.
func getFrame(skipFrames int) runtime.Frame {
targetFrameIndex := skipFrames + 2
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
}
// getStackTrace returns the stacktrace the moment it was called.
// The string format for every entry is the following: <index>: <file> <func>:<line>
func getStackTrace() []string {
var temp []string
// Init i to 2 in order to skip Error constructor and this function's calls
for i := 2; ; i++ {
b := getFrame(i)
if b.Function == "unknown" && b.Line == 0 {
break
}
s := fmt.Sprintf("%v: %v %v:%v", i-2, b.File, b.Function, b.Line)
temp = append(temp, s)
}
return temp
}