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https://git.mirrors.martin98.com/https://github.com/ceph/ceph-csi.git
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bec6090996
Several packages are only used while running the e2e suite. These packages are less important to update, as the they can not influence the final executable that is part of the Ceph-CSI container-image. By moving these dependencies out of the main Ceph-CSI go.mod, it is easier to identify if a reported CVE affects Ceph-CSI, or only the testing (like most of the Kubernetes CVEs). Signed-off-by: Niels de Vos <ndevos@ibm.com>
75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
/*
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Copyright 2014 The Kubernetes 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 volume
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import (
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"sync"
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"sync/atomic"
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)
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var _ MetricsProvider = &cachedMetrics{}
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// cachedMetrics represents a MetricsProvider that wraps another provider and
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// caches the result.
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type cachedMetrics struct {
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wrapped MetricsProvider
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resultError error
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resultMetrics *Metrics
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once cacheOnce
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}
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// NewCachedMetrics creates a new cachedMetrics wrapping another
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// MetricsProvider and caching the results.
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func NewCachedMetrics(provider MetricsProvider) MetricsProvider {
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return &cachedMetrics{wrapped: provider}
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}
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// GetMetrics runs the wrapped metrics provider's GetMetrics method once and
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// caches the result. Will not cache result if there is an error.
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// See MetricsProvider.GetMetrics
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func (md *cachedMetrics) GetMetrics() (*Metrics, error) {
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md.once.cache(func() error {
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md.resultMetrics, md.resultError = md.wrapped.GetMetrics()
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return md.resultError
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})
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return md.resultMetrics, md.resultError
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}
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// Copied from sync.Once but we don't want to cache the results if there is an
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// error
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type cacheOnce struct {
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m sync.Mutex
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done uint32
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}
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// Copied from sync.Once but we don't want to cache the results if there is an
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// error
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func (o *cacheOnce) cache(f func() error) {
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if atomic.LoadUint32(&o.done) == 1 {
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return
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}
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// Slow-path.
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o.m.Lock()
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defer o.m.Unlock()
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if o.done == 0 {
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err := f()
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if err == nil {
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atomic.StoreUint32(&o.done, 1)
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}
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}
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}
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