mudhorn/prometheus
1
0
Fork 0
mirror of https://github.com/prometheus/prometheus.git synced 2025-01-12 06:17:27 -08:00
Code Issues Actions 3 Packages Projects Releases Wiki Activity

Print query that caused a panic (#10995)

Browse source 
We print the stacktrace of a panic when query causes one, but there's no
information about the query itself, which makes it harder to debug and
reproduce the issue.
This adds the 'expr' string to the logged panic.

Signed-off-by: Łukasz Mierzwa <l.mierzwa@gmail.com>
This commit is contained in:
Łukasz Mierzwa 2022-07-14 10:34:15 +01:00 committed by GitHub
parent 409a5e7922
commit 54a3c3ba3f
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 19 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
promql/engine.go
View file

@ -937,7 +937,7 @@ func (ev *evaluator) error(err error) {
}
// recover is the handler that turns panics into returns from the top level of evaluation.
func (ev *evaluator) recover(ws *storage.Warnings, errp *error) {
func (ev *evaluator) recover(expr parser.Expr, ws *storage.Warnings, errp *error) {
e := recover()
if e == nil {
return
@ -949,7 +949,7 @@ func (ev *evaluator) recover(ws *storage.Warnings, errp *error) {
buf := make([]byte, 64<<10)
buf = buf[:runtime.Stack(buf, false)]
level.Error(ev.logger).Log("msg", "runtime panic in parser", "err", e, "stacktrace", string(buf))
level.Error(ev.logger).Log("msg", "runtime panic in parser", "expr", expr.String(), "err", e, "stacktrace", string(buf))
*errp = fmt.Errorf("unexpected error: %w", err)
case errWithWarnings:
*errp = err.err
@ -960,7 +960,7 @@ func (ev *evaluator) recover(ws *storage.Warnings, errp *error) {
}
func (ev *evaluator) Eval(expr parser.Expr) (v parser.Value, ws storage.Warnings, err error) {
defer ev.recover(&ws, &err)
defer ev.recover(expr, &ws, &err)
v, ws = ev.eval(expr)
return v, ws, nil

22
promql/engine_test.go
View file

@ -1641,17 +1641,27 @@ load 1ms
}
func TestRecoverEvaluatorRuntime(t *testing.T) {
ev := &evaluator{logger: log.NewNopLogger()}
var output []interface{}
logger := log.Logger(log.LoggerFunc(func(keyvals ...interface{}) error {
output = append(output, keyvals...)
return nil
}))
ev := &evaluator{logger: logger}
expr, _ := parser.ParseExpr("sum(up)")
var err error
defer ev.recover(nil, &err)
defer func() {
require.EqualError(t, err, "unexpected error: runtime error: index out of range [123] with length 0")
require.Contains(t, output, "sum(up)")
}()
defer ev.recover(expr, nil, &err)
// Cause a runtime panic.
var a []int
//nolint:govet
a[123] = 1
require.EqualError(t, err, "unexpected error")
}
func TestRecoverEvaluatorError(t *testing.T) {
@ -1663,7 +1673,7 @@ func TestRecoverEvaluatorError(t *testing.T) {
defer func() {
require.EqualError(t, err, e.Error())
}()
defer ev.recover(nil, &err)
defer ev.recover(nil, nil, &err)
panic(e)
}
@ -1683,7 +1693,7 @@ func TestRecoverEvaluatorErrorWithWarnings(t *testing.T) {
require.EqualError(t, err, e.Error())
require.Equal(t, warnings, ws, "wrong warning message")
}()
defer ev.recover(&ws, &err)
defer ev.recover(nil, &ws, &err)
panic(e)
}