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cmd/tailscale/cli: add --watch flag to "debug metrics" subcommand

Browse Source 
This adds a new --watch flag that prints out a block of metric changes
every second, if anything changed.

Example output:

magicsock_disco_recv_ping    +1 => 254
magicsock_disco_recv_pong    +1 => 218
magicsock_disco_recv_udp     +2 => 472
magicsock_disco_send_udp     +2 => 536
magicsock_disco_sent_udp     +2 => 536
magicsock_recv_data_ipv6     +1 => 82
magicsock_send_data          +1 => 86
magicsock_send_udp           +3 => 620

magicsock_recv_data_ipv6    +1 => 83
magicsock_send_data         +1 => 87
magicsock_send_udp          +1 => 621

magicsock_disco_recv_ping    +1 => 255
magicsock_disco_recv_pong    +1 => 219
magicsock_disco_recv_udp     +2 => 474
magicsock_disco_send_udp     +2 => 538
magicsock_disco_sent_udp     +2 => 538
magicsock_recv_data_ipv6     +1 => 84
magicsock_send_data          +1 => 88
magicsock_send_udp           +3 => 624

magicsock_recv_data_ipv6    +1 => 85
magicsock_send_data         +1 => 89
magicsock_send_udp          +1 => 625

controlclient_map_response_map          +1 => 207
controlclient_map_response_map_delta    +1 => 204
controlclient_map_response_message      +1 => 275
magicsock_disco_recv_ping               +3 => 258
magicsock_disco_recv_pong               +2 => 221
magicsock_disco_recv_udp                +5 => 479
magicsock_disco_send_derp               +1 => 6
magicsock_disco_send_udp                +7 => 545
magicsock_disco_sent_derp               +1 => 6
magicsock_disco_sent_udp                +7 => 545
magicsock_recv_data_ipv6                +1 => 86
magicsock_send_data                     +1 => 90
magicsock_send_derp                     +1 => 12
magicsock_send_derp_queued              +1 => 12
magicsock_send_udp                      +8 => 633

Updates #3307

Change-Id: I5ac2511e3ad24fa1e6ea958c3946fecebe4f79a7
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-11-16 11:38:40 -08:00 committed by Brad Fitzpatrick
parent 41da7620af
commit 36b1df1241
1 changed files with 64 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
cmd/tailscale/cli/debug.go
View File

@ -5,6 +5,8 @@
package cli
import (
"bufio"
"bytes"
"context"
"encoding/json"
"errors"
@ -14,7 +16,9 @@
"log"
"os"
"runtime"
"strconv"
"strings"
"time"
"github.com/peterbourgon/ff/v3/ffcli"
"tailscale.com/client/tailscale"
@ -50,6 +54,11 @@
Name: "metrics",
Exec: runDaemonMetrics,
ShortHelp: "print tailscaled's metrics",
FlagSet: (func() *flag.FlagSet {
fs := newFlagSet("metrics")
fs.BoolVar(&metricsArgs.watch, "watch", false, "print JSON dump of delta values")
return fs
})(),
},
{
Name: "env",
@ -251,11 +260,59 @@ func runDaemonGoroutines(ctx context.Context, args []string) error {
return nil
}
func runDaemonMetrics(ctx context.Context, args []string) error {
out, err := tailscale.DaemonMetrics(ctx)
if err != nil {
return err
}
Stdout.Write(out)
return nil
var metricsArgs struct {
watch bool
}
func runDaemonMetrics(ctx context.Context, args []string) error {
last := map[string]int64{}
for {
out, err := tailscale.DaemonMetrics(ctx)
if err != nil {
return err
}
if !metricsArgs.watch {
Stdout.Write(out)
return nil
}
bs := bufio.NewScanner(bytes.NewReader(out))
type change struct {
name string
from, to int64
}
var changes []change
var maxNameLen int
for bs.Scan() {
line := bytes.TrimSpace(bs.Bytes())
if len(line) == 0 || line[0] == '#' {
continue
}
f := strings.Fields(string(line))
if len(f) != 2 {
continue
}
name := f[0]
n, _ := strconv.ParseInt(f[1], 10, 64)
prev, ok := last[name]
if ok && prev == n {
continue
}
last[name] = n
if !ok {
continue
}
changes = append(changes, change{name, prev, n})
if len(name) > maxNameLen {
maxNameLen = len(name)
}
}
if len(changes) > 0 {
format := fmt.Sprintf("%%-%ds %%+5d => %%v\n", maxNameLen)
for _, c := range changes {
fmt.Fprintf(Stdout, format, c.name, c.to-c.from, c.to)
}
io.WriteString(Stdout, "\n")
}
time.Sleep(time.Second)
}
}