f606c4eba7
Provides a couple helper functions that provide a background context for running cleanup jobs while preserving the original context values. The new contexts will not inherit the errors or cancellations. Signed-off-by: Derek McGowan <derek@mcg.dev>
59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
/*
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Copyright The containerd 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package cleanup
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import (
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"context"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func TestBackground(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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var k struct{}
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v := "incontext"
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ctx = context.WithValue(ctx, k, v)
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assert.Nil(t, contextError(ctx))
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assert.Equal(t, ctx.Value(k), v)
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cancel()
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assert.Error(t, contextError(ctx))
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assert.Equal(t, ctx.Value(k), v)
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// cleanup context should no longer be canceled
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ctx = Background(ctx)
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assert.Nil(t, contextError(ctx))
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assert.Equal(t, ctx.Value(k), v)
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// cleanup contexts can be rewrapped in cancel context
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ctx, cancel = context.WithCancel(ctx)
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cancel()
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assert.Error(t, contextError(ctx))
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assert.Equal(t, ctx.Value(k), v)
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}
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func contextError(ctx context.Context) error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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return nil
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}
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}
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