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108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package loki
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import (
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"time"
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"github.com/gogo/protobuf/proto"
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"github.com/golang/snappy"
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json "github.com/json-iterator/go"
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"github.com/lixh00/loki-client-go/pkg/logproto"
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)
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// batch holds pending log streams waiting to be sent to Loki, and it's used
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// to reduce the number of push requests to Loki aggregating multiple log streams
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// and entries in a single batch request. In case of multi-tenant Promtail, log
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// streams for each tenant are stored in a dedicated batch.
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type batch struct {
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streams map[string]*logproto.Stream
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bytes int
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createdAt time.Time
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}
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func newBatch(entries ...entry) *batch {
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b := &batch{
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streams: map[string]*logproto.Stream{},
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bytes: 0,
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createdAt: time.Now(),
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}
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// Add entries to the batch
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for _, entry := range entries {
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b.add(entry)
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}
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return b
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}
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// add an entry to the batch
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func (b *batch) add(entry entry) {
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b.bytes += len(entry.Line)
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// Append the entry to an already existing stream (if any)
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labels := entry.labels.String()
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if stream, ok := b.streams[labels]; ok {
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stream.Entries = append(stream.Entries, entry.Entry)
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return
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}
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// Add the entry as a new stream
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b.streams[labels] = &logproto.Stream{
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Labels: labels,
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Entries: []logproto.Entry{entry.Entry},
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}
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}
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// sizeBytes returns the current batch size in bytes
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func (b *batch) sizeBytes() int {
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return b.bytes
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}
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// sizeBytesAfter returns the size of the batch after the input entry
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// will be added to the batch itself
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func (b *batch) sizeBytesAfter(entry entry) int {
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return b.bytes + len(entry.Line)
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}
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// age of the batch since its creation
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func (b *batch) age() time.Duration {
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return time.Since(b.createdAt)
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}
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// encode the batch as snappy-compressed push request, and returns
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// the encoded bytes and the number of encoded entries
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func (b *batch) encode() ([]byte, int, error) {
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req, entriesCount := b.createPushRequest()
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buf, err := proto.Marshal(req)
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if err != nil {
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return nil, 0, err
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}
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buf = snappy.Encode(nil, buf)
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return buf, entriesCount, nil
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}
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// encode the batch as json push request, and returns
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// the encoded bytes and the number of encoded entries
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func (b *batch) encodeJSON() ([]byte, int, error) {
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req, entriesCount := b.createPushRequest()
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buf, err := json.Marshal(req)
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if err != nil {
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return nil, 0, err
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}
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return buf, entriesCount, nil
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}
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// creates push request and returns it, together with number of entries
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func (b *batch) createPushRequest() (*logproto.PushRequest, int) {
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req := logproto.PushRequest{
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Streams: make([]logproto.Stream, 0, len(b.streams)),
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}
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entriesCount := 0
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for _, stream := range b.streams {
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req.Streams = append(req.Streams, *stream)
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entriesCount += len(stream.Entries)
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}
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return &req, entriesCount
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}
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