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fdaafdb041
* 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>
68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
// Copyright 2016 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package testutil
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import (
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"context"
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"time"
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"go.uber.org/atomic"
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)
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// A MockContext provides a simple stub implementation of a Context.
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type MockContext struct {
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Error error
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DoneCh chan struct{}
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}
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// Deadline always will return not set.
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func (c *MockContext) Deadline() (deadline time.Time, ok bool) {
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return time.Time{}, false
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}
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// Done returns a read channel for listening to the Done event.
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func (c *MockContext) Done() <-chan struct{} {
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return c.DoneCh
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}
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// Err returns the error, is nil if not set.
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func (c *MockContext) Err() error {
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return c.Error
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}
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// Value ignores the Value and always returns nil.
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func (c *MockContext) Value(interface{}) interface{} {
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return nil
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}
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// MockContextErrAfter is a MockContext that will return an error after a certain
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// number of calls to Err().
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type MockContextErrAfter struct {
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MockContext
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count atomic.Uint64
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FailAfter uint64
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}
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func (c *MockContextErrAfter) Err() error {
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c.count.Inc()
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if c.count.Load() >= c.FailAfter {
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return context.Canceled
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}
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return c.MockContext.Err()
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}
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func (c *MockContextErrAfter) Count() uint64 {
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return c.count.Load()
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}
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