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zeekayandHanzo Dev
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Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
81 lines
2.5 KiB
Go
81 lines
2.5 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
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// SPDX-License-Identifier: MIT
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package log
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import (
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"bytes"
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"fmt"
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"os"
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"runtime"
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)
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var unknown = []byte("???")
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// Stack will skip back the provided number of frames and return a stack trace with source code.
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// Although we could just use debug.Stack(), this routine will return the source code and
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// skip back the provided number of frames - i.e. allowing us to ignore preceding function calls.
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// A skip of 0 returns the stack trace for the calling function, not including this call.
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// If the problem is a lack of memory of course all this is not going to work...
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func Stack(skip int) string {
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buf := new(bytes.Buffer)
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// Store the last file we opened as its probable that the preceding stack frame
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// will be in the same file
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var lines [][]byte
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var lastFilename string
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for i := skip + 1; ; i++ { // Skip over frames
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programCounter, filename, lineNumber, ok := runtime.Caller(i)
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// If we can't retrieve the information break - basically we're into go internals at this point.
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if !ok {
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break
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}
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// Print equivalent of debug.Stack()
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_, _ = fmt.Fprintf(buf, "%s:%d (0x%x)\n", filename, lineNumber, programCounter)
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// Now try to print the offending line
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if filename != lastFilename {
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data, err := os.ReadFile(filename)
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if err != nil {
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// can't read this source file
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// likely we don't have the sourcecode available
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continue
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}
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lines = bytes.Split(data, []byte{'\n'})
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lastFilename = filename
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}
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_, _ = fmt.Fprintf(buf, "\t%s: %s\n", functionName(programCounter), source(lines, lineNumber))
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}
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return buf.String()
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}
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// functionName converts the provided programCounter into a function name
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func functionName(programCounter uintptr) []byte {
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function := runtime.FuncForPC(programCounter)
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if function == nil {
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return unknown
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}
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name := []byte(function.Name())
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// Because we provide the filename we can drop the preceding package name.
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if lastslash := bytes.LastIndex(name, []byte("/")); lastslash >= 0 {
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name = name[lastslash+1:]
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}
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// And the current package name.
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if period := bytes.Index(name, []byte(".")); period >= 0 {
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name = name[period+1:]
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}
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// And we should just replace the interpunct with a dot
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name = bytes.ReplaceAll(name, []byte("ยท"), []byte("."))
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return name
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}
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// source returns a space-trimmed slice of the n'th line.
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func source(lines [][]byte, n int) []byte {
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n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
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if n < 0 || n >= len(lines) {
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return unknown
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}
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return bytes.TrimSpace(lines[n])
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}
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