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recover.go
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recover.go
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package http
import (
"context"
"fmt"
"net/http"
"runtime"
"runtime/debug"
"strings"
"github.com/gorilla/mux"
"github.com/rs/zerolog"
)
type StackLevel int
const (
StackLevelSimple StackLevel = iota + 1
StackLevelFullStack
)
type RecoveryFunc struct {
StackLevel StackLevel
}
func (s *RecoveryFunc) TryToRecover() mux.MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if p := recover(); p != nil {
w.WriteHeader(http.StatusInternalServerError)
s.logError(r.Context(), p)
// TODO: if the header was already written this will generate an error
return
}
}()
next.ServeHTTP(w, r)
})
}
}
func (s *RecoveryFunc) logError(ctx context.Context, a any) {
logger := zerolog.Ctx(ctx)
logger.Error().Msgf("Recovering from fatal error: %v", a)
if s.StackLevel == StackLevelSimple {
logger.Error().Msg(string(debug.Stack()))
} else {
logger.Error().Msg(format(walk()))
}
}
func format(f []*runtime.Frame) string {
var result string
for _, ff := range f {
result = fmt.Sprintf("%s\n%v", result, ff)
}
return result
}
func walk() []*runtime.Frame {
var pcs [40]uintptr
var frames [40]*runtime.Frame
runtime.Callers(4, pcs[:])
fs := runtime.CallersFrames(pcs[:])
more := true
var f runtime.Frame
i := 0
skip := true
for more && i < 40 {
f, more = fs.Next()
if skip {
if !strings.Contains(f.Function, "panic") {
skip = false
}
} else {
func1 := f
frames[i] = &func1
i++
}
}
ret := frames[:i]
return ret
}