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tag.go
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tag.go
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// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package stream
import (
"github.com/apache/skywalking-banyandb/pkg/bytes"
"github.com/apache/skywalking-banyandb/pkg/encoding"
"github.com/apache/skywalking-banyandb/pkg/fs"
"github.com/apache/skywalking-banyandb/pkg/logger"
pbv1 "github.com/apache/skywalking-banyandb/pkg/pb/v1"
)
type tag struct {
name string
values [][]byte
valueType pbv1.ValueType
}
func (t *tag) reset() {
t.name = ""
values := t.values
for i := range values {
values[i] = nil
}
t.values = values[:0]
}
func (t *tag) resizeValues(valuesLen int) [][]byte {
values := t.values
if n := valuesLen - cap(values); n > 0 {
values = append(values[:cap(values)], make([][]byte, n)...)
}
values = values[:valuesLen]
t.values = values
return values
}
func (t *tag) mustWriteTo(ch *tagMetadata, tagWriter *writer) {
ch.reset()
ch.name = t.name
ch.valueType = t.valueType
// TODO: encoding values based on value type
bb := bigValuePool.Generate()
defer bigValuePool.Release(bb)
// marshal values
bb.Buf = encoding.EncodeBytesBlock(bb.Buf[:0], t.values)
ch.size = uint64(len(bb.Buf))
if ch.size > maxValuesBlockSize {
logger.Panicf("too valuesSize: %d bytes; mustn't exceed %d bytes", ch.size, maxValuesBlockSize)
}
ch.offset = tagWriter.bytesWritten
tagWriter.MustWrite(bb.Buf)
}
func (t *tag) mustReadValues(decoder *encoding.BytesBlockDecoder, reader fs.Reader, cm tagMetadata, count uint64) {
t.name = cm.name
t.valueType = cm.valueType
bb := bigValuePool.Generate()
defer bigValuePool.Release(bb)
valuesSize := cm.size
if valuesSize > maxValuesBlockSize {
logger.Panicf("%s: block size cannot exceed %d bytes; got %d bytes", reader.Path(), maxValuesBlockSize, valuesSize)
}
bb.Buf = bytes.ResizeOver(bb.Buf, int(valuesSize))
fs.MustReadData(reader, int64(cm.offset), bb.Buf)
var err error
t.values, err = decoder.Decode(t.values[:0], bb.Buf, count)
if err != nil {
logger.Panicf("%s: cannot decode values: %v", reader.Path(), err)
}
}
func (t *tag) mustSeqReadValues(decoder *encoding.BytesBlockDecoder, reader *seqReader, cm tagMetadata, count uint64) {
t.name = cm.name
t.valueType = cm.valueType
if cm.offset != reader.bytesRead {
logger.Panicf("%s: offset mismatch: %d vs %d", reader.Path(), cm.offset, reader.bytesRead)
}
valuesSize := cm.size
if valuesSize > maxValuesBlockSize {
logger.Panicf("%s: block size cannot exceed %d bytes; got %d bytes", reader.Path(), maxValuesBlockSize, valuesSize)
}
bb := bigValuePool.Generate()
defer bigValuePool.Release(bb)
bb.Buf = bytes.ResizeOver(bb.Buf, int(valuesSize))
reader.mustReadFull(bb.Buf)
var err error
t.values, err = decoder.Decode(t.values[:0], bb.Buf, count)
if err != nil {
logger.Panicf("%s: cannot decode values: %v", reader.Path(), err)
}
}
var bigValuePool bytes.BufferPool
type tagFamily struct {
name string
tags []tag
}
func (tf *tagFamily) reset() {
tf.name = ""
tags := tf.tags
for i := range tags {
tags[i].reset()
}
tf.tags = tags[:0]
}
func (tf *tagFamily) resizeTags(tagsLen int) []tag {
tags := tf.tags
if n := tagsLen - cap(tags); n > 0 {
tags = append(tags[:cap(tags)], make([]tag, n)...)
}
tags = tags[:tagsLen]
tf.tags = tags
return tags
}