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logtail: add a re-usable buffer for uploads

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This avoids a per-upload alloc (which in practice
often means per-log-line), up to 4k.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2021-08-17 12:29:58 -07:00 committed by Josh Bleecher Snyder
parent 278e7de9c9
commit 0c038b477f
1 changed files with 5 additions and 3 deletions
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8
logtail/logtail.go
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@ -200,9 +200,10 @@ func (l *Logger) drainBlock() (shuttingDown bool) {
}
// drainPending drains and encodes a batch of logs from the buffer for upload.
// It uses scratch as its initial buffer.
// If no logs are available, drainPending blocks until logs are available.
func (l *Logger) drainPending() (res []byte) {
buf := new(bytes.Buffer)
func (l *Logger) drainPending(scratch []byte) (res []byte) {
buf := bytes.NewBuffer(scratch[:0])
buf.WriteByte('[')
entries := 0
@ -261,8 +262,9 @@ func (l *Logger) drainPending() (res []byte) {
func (l *Logger) uploading(ctx context.Context) {
defer close(l.shutdownDone)
scratch := make([]byte, 4096) // reusable buffer to write into
for {
body := l.drainPending()
body := l.drainPending(scratch)
origlen := -1 // sentinel value: uncompressed
// Don't attempt to compress tiny bodies; not worth the CPU cycles.
if l.zstdEncoder != nil && len(body) > 256 {