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feat: show tailnet peer diagnostics after coder ping (#12314)

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Beginnings of a solution to #12297 

Doesn't cover disco or definitively display whether we successfully connected to DERP, but shows some checklist diagnostics for connecting to an agent.

For this first PR, I just added it to `coder ping` to see how we like it, but could be incorporated into `coder ssh` _et al._ after a timeout.

```
$ coder ping dogfood2
p2p connection established in 147ms
pong from dogfood2 p2p via  95.217.xxx.yyy:42631  in 147ms
pong from dogfood2 p2p via  95.217.xxx.yyy:42631  in 140ms
pong from dogfood2 p2p via  95.217.xxx.yyy:42631  in 140ms
✔ preferred DERP region 999 (Council Bluffs, Iowa)
✔ sent local data to Coder networking coodinator
✔ received remote agent data from Coder networking coordinator
    preferred DERP 10013 (Europe Fly.io (Paris))
    endpoints: 95.217.xxx.yyy:42631, 95.217.xxx.yyy:37576, 172.17.0.1:37576, 172.20.0.10:37576
✔ Wireguard handshake 11s ago
```
This commit is contained in:
Spike Curtis
2024-02-27 22:04:46 +04:00
committed by GitHub
parent 32691e67e6
commit 4e7beee102
11 changed files with 503 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cli/cliui/agent.go
+56
View File
@@ -2,13 +2,17 @@ package cliui
import (
"context"
"fmt"
"io"
"strconv"
"strings"
"time"
"github.com/google/uuid"
"golang.org/x/xerrors"
"github.com/coder/coder/v2/codersdk"
"github.com/coder/coder/v2/tailnet"
)
var errAgentShuttingDown = xerrors.New("agent is shutting down")
@@ -281,3 +285,55 @@ type closeFunc func() error
func (c closeFunc) Close() error {
return c()
}
func PeerDiagnostics(w io.Writer, d tailnet.PeerDiagnostics) {
if d.PreferredDERP > 0 {
rn, ok := d.DERPRegionNames[d.PreferredDERP]
if !ok {
rn = "unknown"
}
_, _ = fmt.Fprintf(w, "✔ preferred DERP region: %d (%s)\n", d.PreferredDERP, rn)
} else {
_, _ = fmt.Fprint(w, "✘ not connected to DERP\n")
}
if d.SentNode {
_, _ = fmt.Fprint(w, "✔ sent local data to Coder networking coodinator\n")
} else {
_, _ = fmt.Fprint(w, "✘ have not sent local data to Coder networking coordinator\n")
}
if d.ReceivedNode != nil {
dp := d.ReceivedNode.DERP
dn := ""
// should be 127.3.3.40:N where N is the DERP region
ap := strings.Split(dp, ":")
if len(ap) == 2 {
dp = ap[1]
di, err := strconv.Atoi(dp)
if err == nil {
var ok bool
dn, ok = d.DERPRegionNames[di]
if ok {
dn = fmt.Sprintf("(%s)", dn)
} else {
dn = "(unknown)"
}
}
}
_, _ = fmt.Fprintf(w,
"✔ received remote agent data from Coder networking coordinator\n preferred DERP region: %s %s\n endpoints: %s\n",
dp, dn, strings.Join(d.ReceivedNode.Endpoints, ", "))
} else {
_, _ = fmt.Fprint(w, "✘ have not received remote agent data from Coder networking coordinator\n")
}
if !d.LastWireguardHandshake.IsZero() {
ago := time.Since(d.LastWireguardHandshake)
symbol := "✔"
// wireguard is supposed to refresh handshake on 5 minute intervals
if ago > 5*time.Minute {
symbol = "⚠"
}
_, _ = fmt.Fprintf(w, "%s Wireguard handshake %s ago\n", symbol, ago.Round(time.Second))
} else {
_, _ = fmt.Fprint(w, "✘ Wireguard is not connected\n")
}
}