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reader.go
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reader.go
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package memory
import (
"bytes"
"github.com/pierrec/lz4/v4"
"github.com/prometheus/client_golang/prometheus"
"io"
)
type Reader interface {
io.Reader
io.Writer
Reset()
Len() int
}
type MetricReader struct {
Reader
counter prometheus.Counter
}
func NewMetricReader(reader Reader, counter prometheus.Counter) *MetricReader {
return &MetricReader{Reader: reader, counter: counter}
}
func (metric *MetricReader) Read(buffer []byte) (int, error) {
length, err := metric.Reader.Read(buffer)
if length > 0 {
metric.counter.Add(float64(length))
}
return length, err
}
type LZ4Reader struct {
bufferReader Reader
reader *lz4.Reader
}
func NewLZ4Reader(reader Reader) *LZ4Reader {
return &LZ4Reader{
bufferReader: reader,
reader: lz4.NewReader(reader),
}
}
func (reader LZ4Reader) Read(p []byte) (int, error) {
return reader.reader.Read(p)
}
func (reader LZ4Reader) Write(p []byte) (int, error) {
length, err := reader.bufferReader.Write(p)
reader.reader.Reset(reader.bufferReader)
return length, err
}
func (reader LZ4Reader) Reset() {
reader.bufferReader.Reset()
reader.reader.Reset(reader.bufferReader)
}
func (reader LZ4Reader) Len() int {
return reader.bufferReader.Len()
}
type BufferReader struct {
buffer *bytes.Buffer
}
func NewBufferReader() *BufferReader {
return &BufferReader{buffer: bytes.NewBuffer(nil)}
}
func (reader *BufferReader) Read(p []byte) (int, error) {
return reader.buffer.Read(p)
}
func (reader *BufferReader) Write(p []byte) (int, error) {
return reader.buffer.Write(p)
}
func (reader *BufferReader) Reset() {
reader.buffer = bytes.NewBuffer(nil)
}
func (reader *BufferReader) Len() int {
return reader.buffer.Len()
}