mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-04 23:45:34 +00:00
f49b9f75b8
Adds NewGaugeFunc and NewCounterFunc (inspired by expvar.Func) which change the current value to be reported by a function. This allows some client metric values to be computed on-demand during uploading (at most every 15 seconds), instead of being continuously updated. clientmetric uploading had a bunch of micro-optimizations for memory access (#3331) which are not possible with this approach. However, any performance hit from function-based metrics is contained to those metrics only, and we expect to have very few. Also adds a DisableDeltas() option for client metrics, so that absolute values are always reported. This makes server-side processing of some metrics easier to reason about. Updates tailscale/corp#9230 Signed-off-by: Mihai Parparita <mihai@tailscale.com>
110 lines
2.3 KiB
Go
110 lines
2.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package clientmetric
|
|
|
|
import (
|
|
"testing"
|
|
"time"
|
|
)
|
|
|
|
func TestDeltaEncBuf(t *testing.T) {
|
|
var enc deltaEncBuf
|
|
enc.writeName("one_one", TypeCounter)
|
|
enc.writeValue(1, 1)
|
|
enc.writeName("two_zero", TypeGauge)
|
|
enc.writeValue(2, 0)
|
|
|
|
enc.writeDelta(1, 63)
|
|
enc.writeDelta(2, 64)
|
|
enc.writeDelta(1, -65)
|
|
enc.writeDelta(2, -64)
|
|
|
|
got := enc.buf.String()
|
|
const want = "N0eone_oneS0202N1cgauge_two_zeroS0400I027eI048001I028101I047f"
|
|
if got != want {
|
|
t.Errorf("error\n got %q\nwant %q\n", got, want)
|
|
}
|
|
}
|
|
|
|
func clearMetrics() {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
metrics = map[string]*Metric{}
|
|
numWireID = 0
|
|
lastDelta = time.Time{}
|
|
sorted = nil
|
|
lastLogVal = nil
|
|
unsorted = nil
|
|
}
|
|
|
|
func advanceTime() {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
lastDelta = time.Time{}
|
|
}
|
|
|
|
func TestEncodeLogTailMetricsDelta(t *testing.T) {
|
|
clearMetrics()
|
|
|
|
c1 := NewCounter("foo")
|
|
c2 := NewGauge("bar")
|
|
c1.Add(123)
|
|
if got, want := EncodeLogTailMetricsDelta(), "N06fooS02f601"; got != want {
|
|
t.Errorf("first = %q; want %q", got, want)
|
|
}
|
|
|
|
c2.Add(456)
|
|
advanceTime()
|
|
if got, want := EncodeLogTailMetricsDelta(), "N12gauge_barS049007"; got != want {
|
|
t.Errorf("second = %q; want %q", got, want)
|
|
}
|
|
|
|
advanceTime()
|
|
if got, want := EncodeLogTailMetricsDelta(), ""; got != want {
|
|
t.Errorf("with no changes = %q; want %q", got, want)
|
|
}
|
|
|
|
c1.Add(1)
|
|
c2.Add(2)
|
|
advanceTime()
|
|
if got, want := EncodeLogTailMetricsDelta(), "I0202I0404"; got != want {
|
|
t.Errorf("with increments = %q; want %q", got, want)
|
|
}
|
|
}
|
|
|
|
func TestDisableDeltas(t *testing.T) {
|
|
clearMetrics()
|
|
|
|
c := NewCounter("foo")
|
|
c.DisableDeltas()
|
|
c.Set(123)
|
|
|
|
if got, want := EncodeLogTailMetricsDelta(), "N06fooS02f601"; got != want {
|
|
t.Errorf("first = %q; want %q", got, want)
|
|
}
|
|
|
|
c.Set(456)
|
|
advanceTime()
|
|
if got, want := EncodeLogTailMetricsDelta(), "S029007"; got != want {
|
|
t.Errorf("second = %q; want %q", got, want)
|
|
}
|
|
}
|
|
|
|
func TestWithFunc(t *testing.T) {
|
|
clearMetrics()
|
|
|
|
v := int64(123)
|
|
NewCounterFunc("foo", func() int64 { return v })
|
|
|
|
if got, want := EncodeLogTailMetricsDelta(), "N06fooS02f601"; got != want {
|
|
t.Errorf("first = %q; want %q", got, want)
|
|
}
|
|
|
|
v = 456
|
|
advanceTime()
|
|
if got, want := EncodeLogTailMetricsDelta(), "I029a05"; got != want {
|
|
t.Errorf("second = %q; want %q", got, want)
|
|
}
|
|
}
|