-
Notifications
You must be signed in to change notification settings - Fork 3.4k
/
recovery.go
62 lines (54 loc) · 1.85 KB
/
recovery.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
package server
import (
"context"
"fmt"
"net/http"
"os"
"runtime"
"github.com/grafana/dskit/httpgrpc"
"github.com/grafana/dskit/middleware"
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/grafana/loki/v3/pkg/querier/queryrange/queryrangebase"
"github.com/grafana/loki/v3/pkg/util/constants"
)
const maxStacksize = 8 * 1024
var (
panicTotal = promauto.NewCounter(prometheus.CounterOpts{
Namespace: constants.Loki,
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))
RecoveryMiddleware queryrangebase.Middleware = queryrangebase.MiddlewareFunc(func(next queryrangebase.Handler) queryrangebase.Handler {
return queryrangebase.HandlerFunc(func(ctx context.Context, req queryrangebase.Request) (res queryrangebase.Response, err error) {
defer func() {
if p := recover(); p != nil {
err = onPanic(p)
}
}()
res, err = next.Do(ctx, req)
return
})
})
)
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)
}