/
recovery.go
46 lines (40 loc) · 1.33 KB
/
recovery.go
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package server
import (
"fmt"
"net/http"
"os"
"runtime"
grpc_recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/weaveworks/common/httpgrpc"
"github.com/weaveworks/common/middleware"
)
const maxStacksize = 8 * 1024
var (
panicTotal = promauto.NewCounter(prometheus.CounterOpts{
Namespace: "vali",
Name: "panic_total",
Help: "The total number of panic triggered",
})
RecoveryHTTPMiddleware = middleware.Func(func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
defer func() {
if p := recover(); p != nil {
WriteError(onPanic(p), w)
}
}()
next.ServeHTTP(w, req)
})
})
RecoveryGRPCStreamInterceptor = grpc_recovery.StreamServerInterceptor(grpc_recovery.WithRecoveryHandler(onPanic))
RecoveryGRPCUnaryInterceptor = grpc_recovery.UnaryServerInterceptor(grpc_recovery.WithRecoveryHandler(onPanic))
)
func onPanic(p interface{}) error {
stack := make([]byte, maxStacksize)
stack = stack[:runtime.Stack(stack, true)]
// keep a multiline stack
fmt.Fprintf(os.Stderr, "panic: %v\n%s", p, stack)
panicTotal.Inc()
return httpgrpc.Errorf(http.StatusInternalServerError, "error while processing request: %v", p)
}