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metrics: add a LabelMap type for variables with 1 label dimension.

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This lets us publish sets of vars that are breakdowns along one
dimension in a format that Prometheus and Grafana natively know
how to do useful things with.

Signed-off-by: David Anderson <dave@natulte.net>
This commit is contained in:
David Anderson
2020-03-04 12:24:07 -08:00
committed by Dave Anderson
parent eac62ec5ff
commit f192c05413
3 changed files with 72 additions and 30 deletions
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40
cmd/derper/derper.go
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@@ -28,6 +28,7 @@ import (
"tailscale.com/derp"
"tailscale.com/derp/derphttp"
"tailscale.com/logpolicy"
"tailscale.com/metrics"
"tailscale.com/stun"
"tailscale.com/tsweb"
"tailscale.com/types/key"
@@ -213,51 +214,60 @@ func serveSTUN() {
log.Fatalf("failed to open STUN listener: %v", err)
}
log.Printf("running STUN server on %v", pc.LocalAddr())
var (
stunReadErrors = expvar.NewInt("stun_read_error")
stunWriteErrors = expvar.NewInt("stun_write_error")
stunReadNotSTUN = expvar.NewInt("stun_read_not_stun")
stunReadNotSTUNValid = expvar.NewInt("stun_read_not_stun_valid")
stunReadIPv4 = expvar.NewInt("stun_read_ipv4")
stunReadIPv6 = expvar.NewInt("stun_read_ipv6")
stunWrite = expvar.NewInt("stun_write")
stats = new(metrics.Set)
stunDisposition = &metrics.LabelMap{Label: "disposition"}
stunAddrFamily = &metrics.LabelMap{Label: "family"}
stunReadError = stunDisposition.Get("read_error")
stunNotSTUN = stunDisposition.Get("not_stun")
stunWriteError = stunDisposition.Get("write_error")
stunSuccess = stunDisposition.Get("success")
stunIPv4 = stunAddrFamily.Get("ipv4")
stunIPv6 = stunAddrFamily.Get("ipv6")
)
stats.Set("counter_requests", stunDisposition)
stats.Set("counter_addrfamily", stunAddrFamily)
expvar.Publish("stun", stats)
var buf [64 << 10]byte
for {
n, addr, err := pc.ReadFrom(buf[:])
if err != nil {
log.Printf("STUN ReadFrom: %v", err)
time.Sleep(time.Second)
stunReadErrors.Add(1)
stunReadError.Add(1)
continue
}
ua, ok := addr.(*net.UDPAddr)
if !ok {
log.Printf("STUN unexpected address %T %v", addr, addr)
stunReadErrors.Add(1)
stunReadError.Add(1)
continue
}
pkt := buf[:n]
if !stun.Is(pkt) {
stunReadNotSTUN.Add(1)
stunNotSTUN.Add(1)
continue
}
txid, err := stun.ParseBindingRequest(pkt)
if err != nil {
stunReadNotSTUNValid.Add(1)
stunNotSTUN.Add(1)
continue
}
if ua.IP.To4() != nil {
stunReadIPv4.Add(1)
stunIPv4.Add(1)
} else {
stunReadIPv6.Add(1)
stunIPv6.Add(1)
}
res := stun.Response(txid, ua.IP, uint16(ua.Port))
_, err = pc.WriteTo(res, addr)
if err != nil {
stunWriteErrors.Add(1)
stunWriteError.Add(1)
} else {
stunWrite.Add(1)
stunSuccess.Add(1)
}
}
}