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521fee9817
commit
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module git.blauwelle.com/go/crate/runtimehelper
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go 1.20
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package runtimehelper
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import (
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"fmt"
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"path/filepath"
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"runtime"
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)
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// Frame 调用相关信息
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type Frame struct {
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Function string `json:"func"`
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File string `json:"file"`
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Line int `json:"line"`
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}
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// IsValid 表示是否有效
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func (frame Frame) IsValid() bool {
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return frame.Line > 0
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}
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// GetFilename 返回文件名
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func (frame Frame) GetFilename() string {
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_, file := filepath.Split(frame.File)
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return file
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}
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// SplitFilePath 返回 File 对应的路径和文件名
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func (frame Frame) SplitFilePath() (string, string) {
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return filepath.Split(frame.File)
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}
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// SplitFunction 返回 Function 对应的包路径和函数名
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func (frame Frame) SplitFunction() (string, string) {
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return PackagePathQualifiedFunctionName(frame.Function).Split()
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}
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// Caller 返回当前调用对应的 Frame,
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// skip=0 表示调用 Caller 处.
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func Caller(skip int) Frame {
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pc := make([]uintptr, 1)
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n := runtime.Callers(skip+2, pc)
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frame, _ := runtime.CallersFrames(pc[:n]).Next()
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if frame.PC == 0 {
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return Frame{}
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}
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return Frame{
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Function: frame.Function,
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File: frame.File,
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Line: frame.Line,
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}
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}
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// Stack 返回调用栈,
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// skip=0 表示调用 Stack 处.
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func Stack(skip, maximumFrames int) []Frame {
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pc := make([]uintptr, maximumFrames)
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n := runtime.Callers(skip+2, pc)
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stack := make([]Frame, 0, n)
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frames := runtime.CallersFrames(pc[:n])
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for {
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frame, more := frames.Next()
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if frame.PC != 0 {
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stack = append(stack, Frame{
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Function: frame.Function,
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File: frame.File,
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Line: frame.Line,
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})
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}
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if !more {
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break
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}
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}
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return stack
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}
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// CallerFrame 函数调用对应的 [runtime.Frame],
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// 从 [runtime.Frame] 中可以获取调用路径上的函数的名字、文件、行号等信息;
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// skip 值对应的 [runtime.Frame]:
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// - -1: CallerFrame
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// - 0: 调用 CallerFrame 处
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//
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// 可以使用 [runtime.Frame.PC] != 0 判断 runtime.Frame 有效
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func CallerFrame(skip int) runtime.Frame {
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pc := make([]uintptr, 1)
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n := runtime.Callers(skip+2, pc)
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frame, _ := runtime.CallersFrames(pc[:n]).Next()
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return frame
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}
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// CallersFrames 返回函数调用对应的 [runtime.Frames],
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// 从 Frames 中可以获取调用路径上的函数的名字、文件、行号等信息;
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// skip 值对应的第1个 [runtime.Frame]:
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// - -2: [runtime.Callers]
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// - -1: CallersFrames
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// - 0: 调用 CallersFrames 处
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func CallersFrames(skip, maximumFrames int) *runtime.Frames {
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pc := make([]uintptr, maximumFrames)
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n := runtime.Callers(skip+2, pc)
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return runtime.CallersFrames(pc[:n])
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}
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// PrintCallersFrames 打印函数调用栈,
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// 从调用 PrintCallersFrames 的地方开始打印
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func PrintCallersFrames() {
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frames := CallersFrames(3, 32)
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for {
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frame, more := frames.Next()
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if frame.PC != 0 {
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fmt.Printf("%s:%d in %s\n", frame.File, frame.Line, frame.Function)
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}
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if !more {
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break
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}
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}
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}
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// PackagePathQualifiedFunctionName 是 [runtime.Frame.Function] (package path-qualified function name)
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type PackagePathQualifiedFunctionName string
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// Split 把完整的函数路径切割成包路径和函数名
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func (f PackagePathQualifiedFunctionName) Split() (string, string) {
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var period int
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loop:
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for i := len(f) - 1; i >= 0; i-- {
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switch f[i] {
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case '/':
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break loop
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case '.':
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period = i
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}
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}
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if period == 0 {
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return "", ""
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}
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return string(f[:period]), string(f[period+1:])
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}
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// PackageName 把完整的函数路径切割成包路径和函数名
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func (f PackagePathQualifiedFunctionName) PackageName() string {
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var period int
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for i := len(f) - 1; i >= 0; i-- {
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switch f[i] {
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case '/':
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return string(f[:period])
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case '.':
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period = i
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}
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}
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return string(f[:period])
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}
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// SplitPackageFunctionName 把完整的函数路径切割成包路径和函数名
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// 参数 f 是 [runtime.Frame.Function] (package path-qualified function name),
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func SplitPackageFunctionName(f string) (string, string) {
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return PackagePathQualifiedFunctionName(f).Split()
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}
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// GetPackageName 把完整的函数路径切割成包路径和函数名
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// 参数 f 是 [runtime.Frame.Function] (package path-qualified function name),
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func GetPackageName(f string) string {
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return PackagePathQualifiedFunctionName(f).PackageName()
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}
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