mirror of
https://github.com/ceph/ceph-csi.git
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f87d06ed85
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>
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
/*
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Copyright 2017 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 buffer
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// RingGrowing is a growing ring buffer.
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// Not thread safe.
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type RingGrowing struct {
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data []interface{}
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n int // Size of Data
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beg int // First available element
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readable int // Number of data items available
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}
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// NewRingGrowing constructs a new RingGrowing instance with provided parameters.
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func NewRingGrowing(initialSize int) *RingGrowing {
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return &RingGrowing{
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data: make([]interface{}, initialSize),
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n: initialSize,
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}
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}
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// ReadOne reads (consumes) first item from the buffer if it is available, otherwise returns false.
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func (r *RingGrowing) ReadOne() (data interface{}, ok bool) {
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if r.readable == 0 {
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return nil, false
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}
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r.readable--
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element := r.data[r.beg]
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r.data[r.beg] = nil // Remove reference to the object to help GC
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if r.beg == r.n-1 {
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// Was the last element
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r.beg = 0
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} else {
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r.beg++
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}
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return element, true
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}
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// WriteOne adds an item to the end of the buffer, growing it if it is full.
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func (r *RingGrowing) WriteOne(data interface{}) {
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if r.readable == r.n {
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// Time to grow
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newN := r.n * 2
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newData := make([]interface{}, newN)
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to := r.beg + r.readable
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if to <= r.n {
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copy(newData, r.data[r.beg:to])
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} else {
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copied := copy(newData, r.data[r.beg:])
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copy(newData[copied:], r.data[:(to%r.n)])
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}
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r.beg = 0
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r.data = newData
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r.n = newN
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}
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r.data[(r.readable+r.beg)%r.n] = data
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r.readable++
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}
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