e739dd3e89
Enables developers to extend the existing config and API. Initial proof of concept and work in progress. Implementation details may change. Feedback welcome! Signed-off-by: Michael Mayer <michael@photoprism.app>
96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
package server
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import (
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"bytes"
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"fmt"
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"net/http"
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"net/http/httputil"
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"os"
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"runtime"
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"github.com/gin-gonic/gin"
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)
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var (
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dunno = []byte("???")
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centerDot = []byte("·")
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dot = []byte(".")
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slash = []byte("/")
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)
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// Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.
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func Recovery() gin.HandlerFunc {
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return func(c *gin.Context) {
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defer func() {
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if err := recover(); err != nil {
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stack := stack(3)
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req, _ := httputil.DumpRequest(c.Request, false)
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log.Debugf("server: %s (%s)\n%s", err, string(req), stack)
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c.AbortWithStatus(http.StatusInternalServerError)
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}
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}()
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c.Next()
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}
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}
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// stack returns a nicely formatted stack frame, skipping skip frames.
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func stack(skip int) []byte {
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buf := new(bytes.Buffer) // the returned data
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// As we loop, we open files and read them. These variables record the currently
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// loaded file.
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var lines [][]byte
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var lastFile string
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for i := skip; ; i++ { // Skip the expected number of frames
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pc, file, line, ok := runtime.Caller(i)
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if !ok {
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break
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}
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// Print this much at least. If we cannot find the source, it won't show.
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fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)
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if file != lastFile {
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data, err := os.ReadFile(file)
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if err != nil {
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continue
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}
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lines = bytes.Split(data, []byte{'\n'})
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lastFile = file
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}
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fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))
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}
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return buf.Bytes()
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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 dunno
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}
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return bytes.TrimSpace(lines[n])
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}
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// function returns, if possible, the name of the function containing the PC.
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func function(pc uintptr) []byte {
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fn := runtime.FuncForPC(pc)
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if fn == nil {
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return dunno
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}
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name := []byte(fn.Name())
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// The name includes the path name to the package, which is unnecessary
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// since the file name is already included. Plus, it has center dots.
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// That is, we see
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// runtime/debug.*T·ptrmethod
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// and want
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// *T.ptrmethod
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// Also the package path might contains dot (e.g. code.google.com/...),
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// so first eliminate the path prefix
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if lastslash := bytes.LastIndex(name, slash); lastslash >= 0 {
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name = name[lastslash+1:]
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}
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if period := bytes.Index(name, dot); period >= 0 {
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name = name[period+1:]
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}
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name = bytes.Replace(name, centerDot, dot, -1)
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return name
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}
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