mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-24 07:10:20 +00:00
4f0bb2315b
With Amazon STS and kubernetes cluster is configured with OIDC identity provider, credentials to access Amazon KMS can be fetched using oidc-token(serviceaccount token). Each tenant/namespace needs to create a secret with aws region, role and CMK ARN. Ceph-CSI will assume the given role with oidc token and access aws KMS, with given CMK to encrypt/decrypt DEK which will stored in the image metdata. Refer: https://docs.aws.amazon.com/STS/latest/APIReference/welcome.html Resolves: #2879 Signed-off-by: Rakshith R <rar@redhat.com>
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
package io
|
|
|
|
import (
|
|
"bytes"
|
|
"io"
|
|
)
|
|
|
|
// RingBuffer struct satisfies io.ReadWrite interface.
|
|
//
|
|
// ReadBuffer is a revolving buffer data structure, which can be used to store snapshots of data in a
|
|
// revolving window.
|
|
type RingBuffer struct {
|
|
slice []byte
|
|
start int
|
|
end int
|
|
size int
|
|
}
|
|
|
|
// NewRingBuffer method takes in a byte slice as an input and returns a RingBuffer.
|
|
func NewRingBuffer(slice []byte) *RingBuffer {
|
|
ringBuf := RingBuffer{
|
|
slice: slice,
|
|
}
|
|
return &ringBuf
|
|
}
|
|
|
|
// Write method inserts the elements in a byte slice, and returns the number of bytes written along with any error.
|
|
func (r *RingBuffer) Write(p []byte) (int, error) {
|
|
for _, b := range p {
|
|
// check if end points to invalid index, we need to circle back
|
|
if r.end == len(r.slice) {
|
|
r.end = 0
|
|
}
|
|
// check if start points to invalid index, we need to circle back
|
|
if r.start == len(r.slice) {
|
|
r.start = 0
|
|
}
|
|
// if ring buffer is filled, increment the start index
|
|
if r.size == len(r.slice) {
|
|
r.size--
|
|
r.start++
|
|
}
|
|
|
|
r.slice[r.end] = b
|
|
r.end++
|
|
r.size++
|
|
}
|
|
return len(p), nil
|
|
}
|
|
|
|
// Read copies the data on the ring buffer into the byte slice provided to the method.
|
|
// Returns the read count along with any error encountered while reading.
|
|
func (r *RingBuffer) Read(p []byte) (int, error) {
|
|
// readCount keeps track of the number of bytes read
|
|
var readCount int
|
|
for j := 0; j < len(p); j++ {
|
|
// if ring buffer is empty or completely read
|
|
// return EOF error.
|
|
if r.size == 0 {
|
|
return readCount, io.EOF
|
|
}
|
|
|
|
if r.start == len(r.slice) {
|
|
r.start = 0
|
|
}
|
|
|
|
p[j] = r.slice[r.start]
|
|
readCount++
|
|
// increment the start pointer for ring buffer
|
|
r.start++
|
|
// decrement the size of ring buffer
|
|
r.size--
|
|
}
|
|
return readCount, nil
|
|
}
|
|
|
|
// Len returns the number of unread bytes in the buffer.
|
|
func (r *RingBuffer) Len() int {
|
|
return r.size
|
|
}
|
|
|
|
// Bytes returns a copy of the RingBuffer's bytes.
|
|
func (r RingBuffer) Bytes() []byte {
|
|
var b bytes.Buffer
|
|
io.Copy(&b, &r)
|
|
return b.Bytes()
|
|
}
|
|
|
|
// Reset resets the ring buffer.
|
|
func (r *RingBuffer) Reset() {
|
|
*r = RingBuffer{
|
|
slice: r.slice,
|
|
}
|
|
}
|