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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package tsconsensus
import (
"context"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"slices"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnstate"
"tailscale.com/tsnet"
"tailscale.com/util/dnsname"
)
type status struct {
Status *ipnstate.Status
RaftState string
}
type monitor struct {
ts *tsnet.Server
con *Consensus
sg statusGetter
}
func (m *monitor) getStatus(ctx context.Context) (status, error) {
tStatus, err := m.sg.getStatus(ctx)
if err != nil {
return status{}, err
}
return status{Status: tStatus, RaftState: m.con.raft.State().String()}, nil
}
func serveMonitor(c *Consensus, ts *tsnet.Server, listenAddr string) (*http.Server, error) {
ln, err := ts.Listen("tcp", listenAddr)
if err != nil {
return nil, err
}
m := &monitor{con: c, ts: ts, sg: &tailscaleStatusGetter{
ts: ts,
}}
mux := http.NewServeMux()
mux.HandleFunc("GET /full", m.handleFullStatus)
mux.HandleFunc("GET /{$}", m.handleSummaryStatus)
mux.HandleFunc("GET /netmap", m.handleNetmap)
mux.HandleFunc("POST /dial", m.handleDial)
srv := &http.Server{Handler: mux}
go func() {
err := srv.Serve(ln)
log.Printf("MonitorHTTP stopped serving with error: %v", err)
}()
return srv, nil
}
func (m *monitor) handleFullStatus(w http.ResponseWriter, r *http.Request) {
s, err := m.getStatus(r.Context())
if err != nil {
log.Printf("monitor: error getStatus: %v", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
if err := json.NewEncoder(w).Encode(s); err != nil {
log.Printf("monitor: error encoding full status: %v", err)
return
}
}
func (m *monitor) handleSummaryStatus(w http.ResponseWriter, r *http.Request) {
s, err := m.getStatus(r.Context())
if err != nil {
log.Printf("monitor: error getStatus: %v", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
lines := []string{}
for _, p := range s.Status.Peer {
if p.Online {
name := dnsname.FirstLabel(p.DNSName)
lines = append(lines, fmt.Sprintf("%s\t\t%d\t%d\t%t", name, p.RxBytes, p.TxBytes, p.Active))
}
}
_, err = w.Write(fmt.Appendf(nil, "RaftState: %s\n", s.RaftState))
if err != nil {
log.Printf("monitor: error writing status: %v", err)
return
}
slices.Sort(lines)
for _, ln := range lines {
_, err = w.Write(fmt.Appendf(nil, "%s\n", ln))
if err != nil {
log.Printf("monitor: error writing status: %v", err)
return
}
}
}
func (m *monitor) handleNetmap(w http.ResponseWriter, r *http.Request) {
lc, err := m.ts.LocalClient()
if err != nil {
log.Printf("monitor: error LocalClient: %v", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
watcher, err := lc.WatchIPNBus(r.Context(), ipn.NotifyInitialNetMap)
if err != nil {
log.Printf("monitor: error WatchIPNBus: %v", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
defer watcher.Close()
n, err := watcher.Next()
if err != nil {
log.Printf("monitor: error watcher.Next: %v", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
encoder := json.NewEncoder(w)
encoder.SetIndent("", "\t")
if err := encoder.Encode(n); err != nil {
log.Printf("monitor: error encoding netmap: %v", err)
return
}
}
func (m *monitor) handleDial(w http.ResponseWriter, r *http.Request) {
var dialParams struct {
Addr string
}
defer r.Body.Close()
bs, err := io.ReadAll(http.MaxBytesReader(w, r.Body, maxBodyBytes))
if err != nil {
log.Printf("monitor: error reading body: %v", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
err = json.Unmarshal(bs, &dialParams)
if err != nil {
log.Printf("monitor: error unmarshalling json: %v", err)
http.Error(w, "", http.StatusBadRequest)
return
}
c, err := m.ts.Dial(r.Context(), "tcp", dialParams.Addr)
if err != nil {
log.Printf("monitor: error dialing: %v", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
c.Close()
w.Write([]byte("ok\n"))
}
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