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logtail: default to 2s log flush delay on all platforms

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Per chat. This is close enough to realtime but massively reduces
number of HTTP requests. (which you can verify with
TS_DEBUG_LOGTAIL_WAKES and watching tailscaled run at start)

By contrast, this is set to 2 minutes on mobile.

Change-Id: Id737c7924d452de5c446df3961f5e94a43a33f1f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-10-15 09:02:28 -07:00 committed by Brad Fitzpatrick
parent 63ad49890f
commit a04f1ff9e6
1 changed files with 11 additions and 3 deletions
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14
logtail/logtail.go
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@ -33,6 +33,8 @@
// Config.BaseURL isn't provided.
const DefaultHost = "log.tailscale.io"
const defaultFlushDelay = 2 * time.Second
const (
// CollectionNode is the name of a logtail Config.Collection
// for tailscaled (or equivalent: IPNExtension, Android app).
@ -64,8 +66,12 @@ type Config struct {
// that's safe to embed in a JSON string literal without further escaping.
MetricsDelta func() string
// FlushDelay, if non-zero, is how long to wait to accumulate logs before
// FlushDelay is how long to wait to accumulate logs before
// uploading them.
//
// If zero, a default value is used. (currently 2 seconds)
//
// Negative means to upload immediately.
FlushDelay time.Duration
// IncludeProcID, if true, results in an ephemeral process identifier being
@ -117,6 +123,8 @@ func NewLogger(cfg Config, logf tslogger.Logf) *Logger {
if err != nil {
log.Fatalf("invalid TS_DEBUG_LOGTAIL_FLUSHDELAY: %v", err)
}
} else if cfg.FlushDelay == 0 && !envknob.Bool("IN_TS_TEST") {
cfg.FlushDelay = defaultFlushDelay
}
stdLogf := func(f string, a ...any) {
@ -172,7 +180,7 @@ type Logger struct {
linkMonitor *monitor.Mon
buffer Buffer
drainWake chan struct{} // signal to speed up drain
flushDelay time.Duration // 0 to upload agressively, or >0 to batch at this delay
flushDelay time.Duration // negative or zero to upload agressively, or >0 to batch at this delay
flushPending atomic.Bool
sentinel chan int32
timeNow func() time.Time
@ -189,7 +197,7 @@ type Logger struct {
writeLock sync.Mutex // guards procSequence, flushTimer, buffer.Write calls
procSequence uint64
flushTimer *time.Timer // used when flushDelay non-zero
flushTimer *time.Timer // used when flushDelay is >0
shutdownStart chan struct{} // closed when shutdown begins
shutdownDone chan struct{} // closed when shutdown complete