prometheus/util/testutil/context.go
George Krajcsovits fdaafdb041
tsdb: check for context cancel before regex matching postings (#14096)
* tsdb: check for context cancel before regex matching postings

Regex matching can be heavy if the regex takes a lot of cycles to
evaluate and we can get stuck evaluating postings for a long time
without this fix. The constant checkContextEveryNIterations=100
may be changed later.

Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
2024-05-15 06:26:19 +02:00

68 lines
1.7 KiB
Go

// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package testutil
import (
"context"
"time"
"go.uber.org/atomic"
)
// A MockContext provides a simple stub implementation of a Context.
type MockContext struct {
Error error
DoneCh chan struct{}
}
// Deadline always will return not set.
func (c *MockContext) Deadline() (deadline time.Time, ok bool) {
return time.Time{}, false
}
// Done returns a read channel for listening to the Done event.
func (c *MockContext) Done() <-chan struct{} {
return c.DoneCh
}
// Err returns the error, is nil if not set.
func (c *MockContext) Err() error {
return c.Error
}
// Value ignores the Value and always returns nil.
func (c *MockContext) Value(interface{}) interface{} {
return nil
}
// MockContextErrAfter is a MockContext that will return an error after a certain
// number of calls to Err().
type MockContextErrAfter struct {
MockContext
count atomic.Uint64
FailAfter uint64
}
func (c *MockContextErrAfter) Err() error {
c.count.Inc()
if c.count.Load() >= c.FailAfter {
return context.Canceled
}
return c.MockContext.Err()
}
func (c *MockContextErrAfter) Count() uint64 {
return c.count.Load()
}