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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
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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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 summary
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import (
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info "github.com/google/cadvisor/info/v2"
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)
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// Manages a buffer of usage samples.
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// This is similar to stats buffer in cache/memory.
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// The main difference is that we do not pre-allocate the buffer as most containers
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// won't live that long.
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type SamplesBuffer struct {
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// list of collected samples.
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samples []info.Usage
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// maximum size this buffer can grow to.
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maxSize int
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// index for the latest sample.
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index int
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}
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// Initializes an empty buffer.
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func NewSamplesBuffer(size int) *SamplesBuffer {
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return &SamplesBuffer{
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index: -1,
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maxSize: size,
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}
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}
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// Returns the current number of samples in the buffer.
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func (s *SamplesBuffer) Size() int {
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return len(s.samples)
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}
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// Add an element to the buffer. Oldest one is overwritten if required.
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func (s *SamplesBuffer) Add(stat info.Usage) {
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if len(s.samples) < s.maxSize {
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s.samples = append(s.samples, stat)
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s.index++
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return
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}
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s.index = (s.index + 1) % s.maxSize
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s.samples[s.index] = stat
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}
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// Returns pointers to the last 'n' stats.
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func (s *SamplesBuffer) RecentStats(n int) []*info.Usage {
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if n > len(s.samples) {
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n = len(s.samples)
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}
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start := s.index - (n - 1)
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if start < 0 {
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start += len(s.samples)
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}
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out := make([]*info.Usage, n)
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for i := 0; i < n; i++ {
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index := (start + i) % len(s.samples)
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out[i] = &s.samples[index]
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}
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return out
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}
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