Drop dependency on github.com/cyberdelia/go-metrics-graphite

The go-metrics-graphite package has been unmaintained for 10+ years,
which is a packaging and supply-chain concern for downstream
distributors (see #1831). Nebula only used its Config struct and Once()
entrypoint, so inline just those (~65 lines) into a local graphite.go,
preserving the upstream BSD-2-Clause copyright notice, and remove the
dependency.

Fixes #1831

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

control.go

@@ -52,7 +52,6 @@ type Control struct {
 	sshStart               func()
 	statsStart             func()
 	dnsStart               func()
-	infoAPIStart           func()
 	lighthouseStart        func()
 	networkChangeStart     func(rebind func())
 	connectionManagerStart func(context.Context)
@@ -109,9 +108,6 @@ func (c *Control) Start() error {
 	if c.networkChangeStart != nil {
 		go c.networkChangeStart(c.RebindUDPServer)
 	}
-	if c.infoAPIStart != nil {
-		go c.infoAPIStart()
-	}
 	if c.connectionManagerStart != nil {
 		go c.connectionManagerStart(c.ctx)
 	}

dns_server.go

@@ -258,12 +258,31 @@ func (d *dnsServer) QueryCert(data string) string {
 		return ""
 	}
 
-	crt := findCertificateForVpnAddr(d.certState(), d.hostMap, ip)
+	// The hostmap only ever contains peers we have handshaked with, so it never carries an entry for ourselves.
-	if crt == nil {
+	// Answer self lookups straight from the local cert state.
+	if cs := d.certState(); cs != nil && cs.myVpnAddrsTable != nil && cs.myVpnAddrsTable.Contains(ip) {
+		c := cs.GetDefaultCertificate()
+		if c == nil {
+			return ""
+		}
+		b, err := c.MarshalJSON()
+		if err != nil {
+			return ""
+		}
+		return string(b)
+	}
+
+	hostinfo := d.hostMap.QueryVpnAddr(ip)
+	if hostinfo == nil {
 		return ""
 	}
 
-	b, err := crt.MarshalJSON()
+	q := hostinfo.GetCert()
+	if q == nil {
+		return ""
+	}
+
+	b, err := q.Certificate.MarshalJSON()
 	if err != nil {
 		return ""
 	}

examples/config.yml

@@ -231,35 +231,6 @@ punchy:
   # Overriding this to "" is the same as "/" and will allow overwriting any path on the host.
   #sandbox_dir: /var/tmp/nebula-debug
 
-# EXPERIMENTAL: this feature may change or disappear in the future.
-# info_api exposes a small local HTTP+JSON API that lets other programs on
-# this machine resolve a vpn address to its certificate identity (name, vpn
-# addresses, groups, fingerprint, validity), e.g. for making authorization
-# decisions about an inbound connection:
-#   GET /v1/host?addr=<vpn addr>  - identity of the host owning the address: a
-#     peer with an active tunnel, or this node itself. `addr` may include a
-#     port (`192.168.100.7:54321`), which is ignored, so a connection's remote
-#     address can be passed through as is. Returns 404 when the address is
-#     unknown or has no active tunnel.
-#   GET /v1/self                  - this node's own identity.
-# Identity answers can be trusted because nebula drops inbound packets whose
-# source vpn address is not contained in the sender's certificate, so the
-# source address of a connection arriving over the nebula interface is
-# guaranteed to map to the certificate reported here.
-# There is no authentication in this API; restrict access with unix socket
-# file permissions.
-# This whole section is reloadable.
-#info_api:
-  # Toggles the feature
-  #enabled: false
-  # listen accepts a unix socket path as a unix:// URL with an absolute path:
-  #listen: unix:///var/run/nebula-info-api.sock
-  # File mode for the unix socket, as an octal string.
-  # The socket is created by nebula's user; to grant a group of local services
-  # access, place the socket in a directory with appropriate permissions
-  # (e.g. a systemd RuntimeDirectory) and relax this to "0660".
-  #socket_mode: "0600"
-
 # EXPERIMENTAL: relay support for networks that can't establish direct connections.
 relay:
   # Relays are a list of Nebula IP's that peers can use to relay packets to me.

go.mod

@@ -7,7 +7,6 @@ require (
 	filippo.io/bigmod v0.1.0
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be
 	github.com/armon/go-radix v1.0.0
-	github.com/cyberdelia/go-metrics-graphite v0.0.0-20161219230853-39f87cc3b432
 	github.com/flynn/noise v1.1.0
 	github.com/gaissmai/bart v0.28.0
 	github.com/gogo/protobuf v1.3.2

go.sum

@@ -19,8 +19,6 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cyberdelia/go-metrics-graphite v0.0.0-20161219230853-39f87cc3b432 h1:M5QgkYacWj0Xs8MhpIK/5uwU02icXpEoSo9sM2aRCps=
-github.com/cyberdelia/go-metrics-graphite v0.0.0-20161219230853-39f87cc3b432/go.mod h1:xwIwAxMvYnVrGJPe2FKx5prTrnAjGOD8zvDOnxnrrkM=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

graphite.go

@@ -0,0 +1,117 @@
+package nebula
+
+// This file is a trimmed, inlined copy of the graphite exporter from
+// github.com/cyberdelia/go-metrics-graphite, retaining only the Config type and
+// the Once entrypoint that Nebula uses. The upstream package has been
+// unmaintained for 10+ years, so it was vendored here to drop the dependency.
+// See https://github.com/slackhq/nebula/issues/1831.
+//
+// Copyright 2015 Timothée Peignier. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//  1. Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//  2. Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/rcrowley/go-metrics"
+)
+
+// graphiteConfigExport provides a container with configuration parameters for
+// the Graphite exporter.
+type graphiteConfigExport struct {
+	Addr          *net.TCPAddr     // Network address to connect to
+	Registry      metrics.Registry // Registry to be exported
+	FlushInterval time.Duration    // Flush interval
+	DurationUnit  time.Duration    // Time conversion unit for durations
+	Prefix        string           // Prefix to be prepended to metric names
+	Percentiles   []float64        // Percentiles to export from timers and histograms
+}
+
+// graphiteOnce performs a single submission to Graphite, returning a non-nil
+// error on failed connections.
+func graphiteOnce(c graphiteConfigExport) error {
+	now := time.Now().Unix()
+	du := float64(c.DurationUnit)
+	flushSeconds := float64(c.FlushInterval) / float64(time.Second)
+	conn, err := net.DialTCP("tcp", nil, c.Addr)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+	w := bufio.NewWriter(conn)
+	c.Registry.Each(func(name string, i any) {
+		switch metric := i.(type) {
+		case metrics.Counter:
+			count := metric.Count()
+			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, count, now)
+			fmt.Fprintf(w, "%s.%s.count_ps %.2f %d\n", c.Prefix, name, float64(count)/flushSeconds, now)
+		case metrics.Gauge:
+			fmt.Fprintf(w, "%s.%s.value %d %d\n", c.Prefix, name, metric.Value(), now)
+		case metrics.GaugeFloat64:
+			fmt.Fprintf(w, "%s.%s.value %f %d\n", c.Prefix, name, metric.Value(), now)
+		case metrics.Histogram:
+			h := metric.Snapshot()
+			ps := h.Percentiles(c.Percentiles)
+			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, h.Count(), now)
+			fmt.Fprintf(w, "%s.%s.min %d %d\n", c.Prefix, name, h.Min(), now)
+			fmt.Fprintf(w, "%s.%s.max %d %d\n", c.Prefix, name, h.Max(), now)
+			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, h.Mean(), now)
+			fmt.Fprintf(w, "%s.%s.std-dev %.2f %d\n", c.Prefix, name, h.StdDev(), now)
+			for psIdx, psKey := range c.Percentiles {
+				key := strings.Replace(strconv.FormatFloat(psKey*100.0, 'f', -1, 64), ".", "", 1)
+				fmt.Fprintf(w, "%s.%s.%s-percentile %.2f %d\n", c.Prefix, name, key, ps[psIdx], now)
+			}
+		case metrics.Meter:
+			m := metric.Snapshot()
+			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, m.Count(), now)
+			fmt.Fprintf(w, "%s.%s.one-minute %.2f %d\n", c.Prefix, name, m.Rate1(), now)
+			fmt.Fprintf(w, "%s.%s.five-minute %.2f %d\n", c.Prefix, name, m.Rate5(), now)
+			fmt.Fprintf(w, "%s.%s.fifteen-minute %.2f %d\n", c.Prefix, name, m.Rate15(), now)
+			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, m.RateMean(), now)
+		case metrics.Timer:
+			t := metric.Snapshot()
+			ps := t.Percentiles(c.Percentiles)
+			count := t.Count()
+			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, count, now)
+			fmt.Fprintf(w, "%s.%s.count_ps %.2f %d\n", c.Prefix, name, float64(count)/flushSeconds, now)
+			fmt.Fprintf(w, "%s.%s.min %d %d\n", c.Prefix, name, t.Min()/int64(du), now)
+			fmt.Fprintf(w, "%s.%s.max %d %d\n", c.Prefix, name, t.Max()/int64(du), now)
+			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, t.Mean()/du, now)
+			fmt.Fprintf(w, "%s.%s.std-dev %.2f %d\n", c.Prefix, name, t.StdDev()/du, now)
+			for psIdx, psKey := range c.Percentiles {
+				key := strings.Replace(strconv.FormatFloat(psKey*100.0, 'f', -1, 64), ".", "", 1)
+				fmt.Fprintf(w, "%s.%s.%s-percentile %.2f %d\n", c.Prefix, name, key, ps[psIdx]/du, now)
+			}
+			fmt.Fprintf(w, "%s.%s.one-minute %.2f %d\n", c.Prefix, name, t.Rate1(), now)
+			fmt.Fprintf(w, "%s.%s.five-minute %.2f %d\n", c.Prefix, name, t.Rate5(), now)
+			fmt.Fprintf(w, "%s.%s.fifteen-minute %.2f %d\n", c.Prefix, name, t.Rate15(), now)
+			fmt.Fprintf(w, "%s.%s.mean-rate %.2f %d\n", c.Prefix, name, t.RateMean(), now)
+		}
+		w.Flush()
+	})
+	return nil
+}

info_api_server.go

@@ -1,409 +0,0 @@
-package nebula
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io/fs"
-	"log/slog"
-	"net"
-	"net/http"
-	"net/netip"
-	"os"
-	"path/filepath"
-	"strconv"
-	"strings"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/slackhq/nebula/cert"
-	"github.com/slackhq/nebula/config"
-)
-
-// infoAPIServer is a small http+json listener on a unix socket that lets other
-// programs on this machine resolve a vpn address to its certificate identity (name, groups, networks)
-// for making authorization decisions. Lifecycle works like statsServer: the constructor wires the
-// reload callback, reload records config, Start runs the runtime, Stop tears it down
-type infoAPIServer struct {
-	l       *slog.Logger
-	ctx     context.Context
-	hostMap *HostMap
-	pki     *PKI
-
-	// enabled mirrors `info_api.enabled` so callers of Start don't need to know the gating rules
-	enabled atomic.Bool
-
-	runMu  sync.Mutex
-	runCfg *infoAPIConfig
-	run    *infoAPIRuntime // non-nil while a runtime is live
-}
-
-// infoAPIRuntime is the live state owned by a single Start invocation. Stop and Start's exit path
-// use pointer equality to tell "my runtime" apart from one that replaced it after a reload
-type infoAPIRuntime struct {
-	server   *http.Server
-	listener net.Listener
-}
-
-// infoAPIConfig is a snapshot of the info_api config section, comparable with == so reload can
-// detect "no change" cheaply
-type infoAPIConfig struct {
-	enabled bool
-	listen  string // raw config value, for error messages
-	addr    string // unix socket path
-	// file mode applied to the unix socket after bind
-	socketMode fs.FileMode
-}
-
-// newInfoAPIServerFromConfig builds a infoAPIServer and applies the initial config. The reload
-// callback is registered first so a SIGHUP can later enable, fix, or disable the listener even if
-// the initial config was bad. Nothing binds until Start, so config tests are side effect free.
-// A bad config is logged rather than returned: it must not stop nebula from starting, the feature
-// just stays disabled until a reload provides a valid config
-func newInfoAPIServerFromConfig(ctx context.Context, l *slog.Logger, pki *PKI, hostMap *HostMap, c *config.C) *infoAPIServer {
-	h := &infoAPIServer{
-		l:       l,
-		ctx:     ctx,
-		hostMap: hostMap,
-		pki:     pki,
-	}
-
-	c.RegisterReloadCallback(func(c *config.C) {
-		if err := h.reload(c, false); err != nil {
-			h.l.Warn("Failed to reload info API from config", "error", err)
-		}
-	})
-
-	if err := h.reload(c, true); err != nil {
-		h.l.Warn("Failed to apply info API config; it will stay disabled until the config is fixed and reloaded", "error", err)
-	}
-	return h
-}
-
-// reload records the latest config. The initial call only records it, Control.Start launches the
-// first runtime via infoAPIStart. Later calls reconcile the running listener with the new config:
-// enable, disable, or restart when the listen config changed
-func (h *infoAPIServer) reload(c *config.C, initial bool) error {
-	newCfg, err := loadInfoAPIConfig(c)
-	if err != nil {
-		return err
-	}
-
-	h.runMu.Lock()
-	sameCfg := h.runCfg != nil && *h.runCfg == newCfg
-	h.runCfg = &newCfg
-	running := h.run != nil
-	h.runMu.Unlock()
-
-	h.enabled.Store(newCfg.enabled)
-
-	if initial || sameCfg {
-		return nil
-	}
-
-	if running {
-		h.Stop()
-	}
-	if newCfg.enabled {
-		go h.Start()
-	}
-	return nil
-}
-
-// Start binds the listener from the latest config and serves until Stop is called or ctx fires.
-// Safe to call when disabled or already running (both no-op)
-func (h *infoAPIServer) Start() {
-	if !h.enabled.Load() {
-		return
-	}
-
-	h.runMu.Lock()
-	if h.ctx.Err() != nil || h.run != nil || h.runCfg == nil {
-		h.runMu.Unlock()
-		return
-	}
-	cfg := *h.runCfg
-	ln, err := h.listen(cfg)
-	if err != nil {
-		// drop the cached config so a SIGHUP with the same config retries the bind
-		h.runCfg = nil
-		h.runMu.Unlock()
-		h.l.Error("Failed to start info API listener", "listen", cfg.listen, "error", err)
-		return
-	}
-
-	mux := http.NewServeMux()
-	mux.HandleFunc("GET /v1/host", h.handleHost)
-	mux.HandleFunc("GET /v1/self", h.handleSelf)
-	srv := &http.Server{Handler: mux, ReadHeaderTimeout: 5 * time.Second}
-	rt := &infoAPIRuntime{server: srv, listener: ln}
-	h.run = rt
-	h.runMu.Unlock()
-
-	h.l.Info("Starting info API listener", "addr", ln.Addr())
-	cleanExit := h.serve(srv, ln)
-
-	// A Stop that raced our bind shut the server down before Serve could adopt the listener;
-	// closing it again is harmless and guarantees a unix socket file gets unlinked
-	_ = ln.Close()
-
-	// Clear our runtime only if nothing has replaced it. Stop races through here too but leaves
-	// h.run == nil, so the pointer check skips
-	h.runMu.Lock()
-	if h.run == rt {
-		h.run = nil
-		// an error exit leaves runCfg cached as if it were applied, drop it so a SIGHUP with the
-		// same config re-triggers Start once the user fixes the underlying problem
-		if !cleanExit {
-			h.runCfg = nil
-		}
-	}
-	h.runMu.Unlock()
-}
-
-// serve runs srv.Serve and ensures ctx cancellation unblocks it. Returns true if the listener
-// exited cleanly (Stop, ctx cancellation), false on an unexpected error
-func (h *infoAPIServer) serve(srv *http.Server, ln net.Listener) bool {
-	// ctx cancellation triggers a server shutdown which in turn unblocks Serve, closing `done` on
-	// exit keeps the watcher from outliving this call
-	done := make(chan struct{})
-	go func() {
-		select {
-		case <-h.ctx.Done():
-			shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-			defer cancel()
-			if err := srv.Shutdown(shutdownCtx); err != nil {
-				h.l.Warn("Failed to shut down info API listener", "error", err)
-			}
-		case <-done:
-		}
-	}()
-	defer close(done)
-
-	err := srv.Serve(ln)
-	if err == nil || errors.Is(err, http.ErrServerClosed) {
-		return true
-	}
-	h.l.Error("Info API listener exited", "error", err)
-	return false
-}
-
-// Stop tears down the active runtime, if any. Idempotent
-func (h *infoAPIServer) Stop() {
-	h.runMu.Lock()
-	rt := h.run
-	h.run = nil
-	h.runMu.Unlock()
-	if rt == nil {
-		return
-	}
-	shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-	defer cancel()
-	if err := rt.server.Shutdown(shutdownCtx); err != nil {
-		h.l.Warn("Failed to shut down info API listener", "error", err)
-	}
-}
-
-// listen binds the configured unix socket. It also clears a stale socket file left by an unclean
-// exit and applies the configured file mode
-func (h *infoAPIServer) listen(cfg infoAPIConfig) (net.Listener, error) {
-	if fi, err := os.Stat(cfg.addr); err == nil {
-		if fi.Mode()&os.ModeSocket == 0 {
-			return nil, fmt.Errorf("info_api.listen path %s exists and is not a socket, refusing to replace it", cfg.addr)
-		}
-		// a normal shutdown unlinks the socket, so a file here means a previous process exited
-		// uncleanly, remove it so the bind below can succeed
-		if err = os.Remove(cfg.addr); err != nil {
-			return nil, fmt.Errorf("failed to remove stale socket %s: %w", cfg.addr, err)
-		}
-	}
-
-	ln, err := net.Listen("unix", cfg.addr)
-	if err != nil {
-		return nil, err
-	}
-	// The socket is briefly live with umask-derived permissions before this chmod lands, tolerated
-	// because connections accepted in that window still only reach this read-only API
-	if err = os.Chmod(cfg.addr, cfg.socketMode); err != nil {
-		_ = ln.Close()
-		return nil, fmt.Errorf("failed to set mode on socket %s: %w", cfg.addr, err)
-	}
-	return ln, nil
-}
-
-func (h *infoAPIServer) certState() *CertState {
-	if h.pki == nil {
-		return nil
-	}
-	return h.pki.getCertState()
-}
-
-// handleHost serves GET /v1/host?addr=<vpn addr>, answering with the identity of the host that
-// owns the address: a peer with an active tunnel, or this node itself. addr may include a port,
-// which is ignored, so clients can pass a connection's remote address through without parsing it
-func (h *infoAPIServer) handleHost(w http.ResponseWriter, r *http.Request) {
-	q := r.URL.Query().Get("addr")
-	if q == "" {
-		writeJSONError(w, http.StatusBadRequest, "missing addr parameter")
-		return
-	}
-	ip, err := parseQueryAddrParam(q)
-	if err != nil {
-		writeJSONError(w, http.StatusBadRequest, "invalid address")
-		return
-	}
-
-	crt := findCertificateForVpnAddr(h.certState(), h.hostMap, ip)
-	if crt == nil {
-		writeJSONError(w, http.StatusNotFound, "no active tunnel for address")
-		return
-	}
-	h.writeHostIdentity(w, crt)
-}
-
-// handleSelf serves GET /v1/self, answering with this node's own identity
-func (h *infoAPIServer) handleSelf(w http.ResponseWriter, r *http.Request) {
-	var crt cert.Certificate
-	if cs := h.certState(); cs != nil {
-		crt = cs.getCertificate(cs.initiatingVersion)
-	}
-	if crt == nil {
-		writeJSONError(w, http.StatusInternalServerError, "no certificate available")
-		return
-	}
-	h.writeHostIdentity(w, crt)
-}
-
-func (h *infoAPIServer) writeHostIdentity(w http.ResponseWriter, crt cert.Certificate) {
-	id, err := newHostIdentity(crt)
-	if err != nil {
-		writeJSONError(w, http.StatusInternalServerError, "failed to fingerprint certificate")
-		return
-	}
-	w.Header().Set("Content-Type", "application/json")
-	if err = json.NewEncoder(w).Encode(id); err != nil {
-		h.l.Debug("Failed to write info API response", "error", err)
-	}
-}
-
-// findCertificateForVpnAddr answers "who owns this vpn address": ourselves (from local cert state,
-// the hostmap never carries an entry for this node) or a peer with an active tunnel. Returns nil
-// when the address is unknown or the tunnel is mid-teardown
-func findCertificateForVpnAddr(cs *CertState, hostMap *HostMap, ip netip.Addr) cert.Certificate {
-	if cs != nil && cs.myVpnAddrsTable != nil && cs.myVpnAddrsTable.Contains(ip) {
-		return cs.getCertificate(cs.initiatingVersion)
-	}
-
-	hostinfo := hostMap.QueryVpnAddr(ip)
-	if hostinfo == nil {
-		return nil
-	}
-	cc := hostinfo.GetCert()
-	if cc == nil {
-		return nil
-	}
-	return cc.Certificate
-}
-
-// hostIdentity is the json document served for both /v1/host and /v1/self, every field is derived
-// from the authenticated certificate alone
-type hostIdentity struct {
-	Name           string         `json:"name"`
-	VpnAddrs       []netip.Addr   `json:"vpnAddrs"`
-	Networks       []netip.Prefix `json:"networks"`
-	UnsafeNetworks []netip.Prefix `json:"unsafeNetworks"`
-	Groups         []string       `json:"groups"`
-	Fingerprint    string         `json:"fingerprint"`
-	Issuer         string         `json:"issuer"`
-	NotBefore      time.Time      `json:"notBefore"`
-	NotAfter       time.Time      `json:"notAfter"`
-	CertVersion    int            `json:"certVersion"`
-}
-
-func newHostIdentity(crt cert.Certificate) (hostIdentity, error) {
-	fp, err := crt.Fingerprint()
-	if err != nil {
-		return hostIdentity{}, err
-	}
-
-	// slices are always allocated so they marshal as [] rather than null
-	networks := crt.Networks()
-	id := hostIdentity{
-		Name:           crt.Name(),
-		VpnAddrs:       make([]netip.Addr, 0, len(networks)),
-		Networks:       append(make([]netip.Prefix, 0, len(networks)), networks...),
-		UnsafeNetworks: append(make([]netip.Prefix, 0, len(crt.UnsafeNetworks())), crt.UnsafeNetworks()...),
-		Groups:         append(make([]string, 0, len(crt.Groups())), crt.Groups()...),
-		Fingerprint:    fp,
-		Issuer:         crt.Issuer(),
-		NotBefore:      crt.NotBefore(),
-		NotAfter:       crt.NotAfter(),
-		CertVersion:    int(crt.Version()),
-	}
-	for _, n := range networks {
-		id.VpnAddrs = append(id.VpnAddrs, n.Addr())
-	}
-	return id, nil
-}
-
-func writeJSONError(w http.ResponseWriter, status int, msg string) {
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(status)
-	_ = json.NewEncoder(w).Encode(map[string]string{"error": msg})
-}
-
-// parseQueryAddrParam parses the addr query parameter, accepting a bare address or an address with
-// a port (`192.168.100.7:54321`, `[fd00::1]:443`) so callers can pass a connection's RemoteAddr
-// straight through. The result is unmapped, 4in6 addresses (::ffff:a.b.c.d) become ipv4
-func parseQueryAddrParam(s string) (netip.Addr, error) {
-	if ip, err := netip.ParseAddr(s); err == nil {
-		return ip.Unmap(), nil
-	}
-	ap, err := netip.ParseAddrPort(s)
-	if err != nil {
-		return netip.Addr{}, err
-	}
-	return ap.Addr().Unmap(), nil
-}
-
-func loadInfoAPIConfig(c *config.C) (infoAPIConfig, error) {
-	cfg := infoAPIConfig{
-		enabled: c.GetBool("info_api.enabled", false),
-		listen:  c.GetString("info_api.listen", ""),
-	}
-	if !cfg.enabled {
-		return cfg, nil
-	}
-
-	if cfg.listen == "" {
-		return cfg, errors.New("info_api.listen can not be empty when info_api is enabled")
-	}
-	addr, err := parseInfoAPIListen(cfg.listen)
-	if err != nil {
-		return cfg, err
-	}
-	cfg.addr = addr
-
-	// read as a string so yaml can't reinterpret the octal literal
-	modeStr := c.GetString("info_api.socket_mode", "0600")
-	mode, err := strconv.ParseUint(modeStr, 8, 32)
-	if err != nil || fs.FileMode(mode)&^fs.ModePerm != 0 {
-		return cfg, fmt.Errorf("info_api.socket_mode was not a valid octal file mode: %s", modeStr)
-	}
-	cfg.socketMode = fs.FileMode(mode)
-	return cfg, nil
-}
-
-// parseInfoAPIListen extracts the unix socket path from the info_api.listen config value, which
-// must be a `unix://` URL with an absolute path, e.g. `unix:///var/run/nebula.sock`
-func parseInfoAPIListen(listen string) (addr string, err error) {
-	path, ok := strings.CutPrefix(listen, "unix://")
-	if !ok {
-		return "", fmt.Errorf("info_api.listen must be a unix:// socket path: %s", listen)
-	} else if !filepath.IsAbs(path) {
-		return "", fmt.Errorf("info_api.listen unix socket path must be absolute: %s", listen)
-	}
-	return path, nil
-}

info_api_server_test.go

@@ -1,448 +0,0 @@
-package nebula
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"io/fs"
-	"log/slog"
-	"net"
-	"net/http"
-	"net/http/httptest"
-	"net/netip"
-	"net/url"
-	"os"
-	"path/filepath"
-	"runtime"
-	"testing"
-	"time"
-
-	"github.com/slackhq/nebula/cert"
-	"github.com/slackhq/nebula/cert_test"
-	"github.com/slackhq/nebula/config"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func Test_parseInfoAPIListen(t *testing.T) {
-	type testCase struct {
-		listen  string
-		addr    string
-		wantErr bool
-	}
-	tests := []testCase{
-		{listen: "", wantErr: true},
-		{listen: "unix://", wantErr: true},
-		{listen: "unix://relative/path.sock", wantErr: true},
-		{listen: "not an address", wantErr: true},
-		// tcp host:port addresses are no longer accepted
-		{listen: "127.0.0.1:8085", wantErr: true},
-		{listen: "[::1]:8085", wantErr: true},
-		{listen: "localhost:8085", wantErr: true},
-	}
-
-	// A unix socket path must be absolute for the OS that will bind it, and filepath.IsAbs is
-	// GOOS-specific. CI runs the suite separately on each OS, so assert the platform's own native
-	// absolute path is accepted while the other platform's is rejected.
-	posixPath := "unix:///var/run/nebula.sock"
-	winPath := `unix://C:\nebula\hq.sock`
-	if runtime.GOOS == "windows" {
-		tests = append(tests,
-			testCase{listen: winPath, addr: `C:\nebula\hq.sock`},
-			testCase{listen: posixPath, wantErr: true},
-		)
-	} else {
-		tests = append(tests,
-			testCase{listen: posixPath, addr: "/var/run/nebula.sock"},
-			testCase{listen: winPath, wantErr: true},
-		)
-	}
-
-	for _, tt := range tests {
-		addr, err := parseInfoAPIListen(tt.listen)
-		if tt.wantErr {
-			require.Error(t, err, "listen=%q", tt.listen)
-			continue
-		}
-		require.NoError(t, err, "listen=%q", tt.listen)
-		assert.Equal(t, tt.addr, addr, "listen=%q", tt.listen)
-	}
-}
-
-func Test_loadInfoAPIConfig(t *testing.T) {
-	c := config.NewC(nil)
-
-	// the listen path must be absolute for the OS running the test (CI is per-OS)
-	listen, wantAddr := "unix:///tmp/hq.sock", "/tmp/hq.sock"
-	if runtime.GOOS == "windows" {
-		listen, wantAddr = `unix://C:\tmp\hq.sock`, `C:\tmp\hq.sock`
-	}
-
-	// absent section means disabled, no error
-	cfg, err := loadInfoAPIConfig(c)
-	require.NoError(t, err)
-	assert.False(t, cfg.enabled)
-
-	// enabled without a listen address is an error
-	setInfoAPIConfig(c, true, "", "")
-	_, err = loadInfoAPIConfig(c)
-	require.Error(t, err)
-
-	// a unix socket gets the default mode
-	setInfoAPIConfig(c, true, listen, "")
-	cfg, err = loadInfoAPIConfig(c)
-	require.NoError(t, err)
-	assert.Equal(t, wantAddr, cfg.addr)
-	assert.Equal(t, fs.FileMode(0o600), cfg.socketMode)
-
-	setInfoAPIConfig(c, true, listen, "0660")
-	cfg, err = loadInfoAPIConfig(c)
-	require.NoError(t, err)
-	assert.Equal(t, fs.FileMode(0o660), cfg.socketMode)
-
-	setInfoAPIConfig(c, true, listen, "withers")
-	_, err = loadInfoAPIConfig(c)
-	require.Error(t, err)
-
-	// mode bits beyond the permission bits are rejected
-	setInfoAPIConfig(c, true, listen, "10600")
-	_, err = loadInfoAPIConfig(c)
-	require.Error(t, err)
-
-	// tcp host:port listen addresses are no longer supported
-	setInfoAPIConfig(c, true, "127.0.0.1:8085", "")
-	_, err = loadInfoAPIConfig(c)
-	require.Error(t, err)
-}
-
-func TestInfoAPIServer_badConfigIsNonFatal(t *testing.T) {
-	// an enabled-but-invalid config must not stop construction; nebula keeps starting and the
-	// feature simply stays disabled until a reload supplies a valid config
-	c := config.NewC(nil)
-	setInfoAPIConfig(c, true, "not-a-unix-socket", "")
-	h := newInfoAPIServerFromConfig(context.Background(), slog.New(slog.DiscardHandler), nil, newHostMap(slog.New(slog.DiscardHandler)), c)
-	require.NotNil(t, h)
-	assert.False(t, h.enabled.Load())
-
-	// no config was recorded, so Start has nothing to bind and is a no-op
-	h.runMu.Lock()
-	assert.Nil(t, h.runCfg)
-	h.runMu.Unlock()
-	h.Start()
-	h.runMu.Lock()
-	assert.Nil(t, h.run)
-	h.runMu.Unlock()
-}
-
-func setInfoAPIConfig(c *config.C, enabled bool, listen, socketMode string) {
-	settings := map[string]any{
-		"enabled": enabled,
-		"listen":  listen,
-	}
-	if socketMode != "" {
-		settings["socket_mode"] = socketMode
-	}
-	c.Settings["info_api"] = settings
-}
-
-func newTestInfoAPIServer(t *testing.T) (*infoAPIServer, *config.C) {
-	t.Helper()
-	h := &infoAPIServer{
-		l:       slog.New(slog.DiscardHandler),
-		ctx:     context.Background(),
-		hostMap: newHostMap(slog.New(slog.DiscardHandler)),
-	}
-	h.hostMap.preferredRanges.Store(&[]netip.Prefix{})
-	return h, config.NewC(nil)
-}
-
-// addTestPeer creates a certificate for a peer owning each addr (as a /24 or /64) and inserts it
-// into the hostmap as an established tunnel
-func addTestPeer(t *testing.T, hm *HostMap, name string, addrs []netip.Addr, unsafeNetworks []netip.Prefix, groups []string) cert.Certificate {
-	t.Helper()
-	networks := make([]netip.Prefix, 0, len(addrs))
-	for _, a := range addrs {
-		bits := 24
-		if a.Is6() {
-			bits = 64
-		}
-		networks = append(networks, netip.PrefixFrom(a, bits))
-	}
-	ca, _, caKey, _ := cert_test.NewTestCaCert(cert.Version2, cert.Curve_CURVE25519, time.Time{}, time.Time{}, nil, nil, nil)
-	crt, _, _, _ := cert_test.NewTestCert(cert.Version2, cert.Curve_CURVE25519, ca, caKey, name, time.Time{}, time.Time{}, networks, unsafeNetworks, groups)
-	fp, err := crt.Fingerprint()
-	require.NoError(t, err)
-
-	hm.unlockedAddHostInfo(&HostInfo{
-		ConnectionState: &ConnectionState{
-			peerCert: &cert.CachedCertificate{Certificate: crt, Fingerprint: fp},
-		},
-		vpnAddrs: addrs,
-		relayState: RelayState{
-			relayForByAddr: map[netip.Addr]*Relay{},
-			relayForByIdx:  map[uint32]*Relay{},
-		},
-	}, &Interface{})
-	return crt
-}
-
-func getHost(t *testing.T, h *infoAPIServer, addrParam string) (int, map[string]any) {
-	t.Helper()
-	r := httptest.NewRequest(http.MethodGet, "/v1/host?addr="+url.QueryEscape(addrParam), nil)
-	w := httptest.NewRecorder()
-	h.handleHost(w, r)
-	return decodeResponse(t, w)
-}
-
-func decodeResponse(t *testing.T, w *httptest.ResponseRecorder) (int, map[string]any) {
-	t.Helper()
-	assert.Equal(t, "application/json", w.Header().Get("Content-Type"))
-	var body map[string]any
-	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
-	return w.Code, body
-}
-
-func TestInfoAPIServer_handleHost(t *testing.T) {
-	h, _ := newTestInfoAPIServer(t)
-	h.pki = newTestPKI(t, "self", []netip.Addr{netip.MustParseAddr("10.0.0.1")})
-
-	peerV4 := netip.MustParseAddr("10.0.0.99")
-	peerV6 := netip.MustParseAddr("fd00::99")
-	addTestPeer(t, h.hostMap, "laptop-alice", []netip.Addr{peerV4, peerV6},
-		[]netip.Prefix{netip.MustParsePrefix("192.168.50.0/24")}, []string{"eng", "ssh"})
-	addTestPeer(t, h.hostMap, "groupless", []netip.Addr{netip.MustParseAddr("10.0.0.77")}, nil, nil)
-
-	// an established peer comes back with its full identity
-	code, body := getHost(t, h, "10.0.0.99")
-	require.Equal(t, http.StatusOK, code)
-	assert.Equal(t, "laptop-alice", body["name"])
-	assert.Equal(t, []any{"10.0.0.99", "fd00::99"}, body["vpnAddrs"])
-	assert.Equal(t, []any{"10.0.0.99/24", "fd00::99/64"}, body["networks"])
-	assert.Equal(t, []any{"192.168.50.0/24"}, body["unsafeNetworks"])
-	assert.Equal(t, []any{"eng", "ssh"}, body["groups"])
-	assert.NotEmpty(t, body["fingerprint"])
-	assert.Equal(t, "2", fmt.Sprintf("%v", body["certVersion"]))
-	assert.NotEmpty(t, body["notBefore"])
-	assert.NotEmpty(t, body["notAfter"])
-
-	// empty cert slices marshal as [] rather than null
-	code, body = getHost(t, h, "10.0.0.77")
-	require.Equal(t, http.StatusOK, code)
-	require.NotNil(t, body["groups"])
-	assert.Empty(t, body["groups"])
-	require.NotNil(t, body["unsafeNetworks"])
-	assert.Empty(t, body["unsafeNetworks"])
-
-	// a port in addr is ignored so RemoteAddr can be passed through directly, including the
-	// bracketed v6 and 4in6 forms
-	for _, q := range []string{"10.0.0.99:54321", "[fd00::99]:443", "::ffff:10.0.0.99"} {
-		code, body = getHost(t, h, q)
-		require.Equal(t, http.StatusOK, code, "addr=%q", q)
-		assert.Equal(t, "laptop-alice", body["name"], "addr=%q", q)
-	}
-
-	// our own address answers from the local cert state
-	code, body = getHost(t, h, "10.0.0.1")
-	require.Equal(t, http.StatusOK, code)
-	assert.Equal(t, "self", body["name"])
-
-	code, body = getHost(t, h, "10.0.0.42")
-	assert.Equal(t, http.StatusNotFound, code)
-	assert.NotEmpty(t, body["error"])
-
-	// a tunnel mid-teardown (no peer cert) is treated as unknown
-	h.hostMap.unlockedAddHostInfo(&HostInfo{
-		ConnectionState: &ConnectionState{},
-		vpnAddrs:        []netip.Addr{netip.MustParseAddr("10.0.0.66")},
-		relayState: RelayState{
-			relayForByAddr: map[netip.Addr]*Relay{},
-			relayForByIdx:  map[uint32]*Relay{},
-		},
-	}, &Interface{})
-	code, _ = getHost(t, h, "10.0.0.66")
-	assert.Equal(t, http.StatusNotFound, code)
-
-	code, body = getHost(t, h, "not-an-address")
-	assert.Equal(t, http.StatusBadRequest, code)
-	assert.NotEmpty(t, body["error"])
-
-	r := httptest.NewRequest(http.MethodGet, "/v1/host", nil)
-	w := httptest.NewRecorder()
-	h.handleHost(w, r)
-	code, body = decodeResponse(t, w)
-	assert.Equal(t, http.StatusBadRequest, code)
-	assert.NotEmpty(t, body["error"])
-}
-
-func TestInfoAPIServer_handleSelf(t *testing.T) {
-	h, _ := newTestInfoAPIServer(t)
-	h.pki = newTestPKI(t, "lighthouse", []netip.Addr{netip.MustParseAddr("10.0.0.1")})
-
-	r := httptest.NewRequest(http.MethodGet, "/v1/self", nil)
-	w := httptest.NewRecorder()
-	h.handleSelf(w, r)
-	code, body := decodeResponse(t, w)
-	require.Equal(t, http.StatusOK, code)
-	assert.Equal(t, "lighthouse", body["name"])
-	assert.Equal(t, []any{"10.0.0.1"}, body["vpnAddrs"])
-
-	// no cert state available should be an error, not a panic
-	h.pki = nil
-	w = httptest.NewRecorder()
-	h.handleSelf(w, r)
-	code, body = decodeResponse(t, w)
-	assert.Equal(t, http.StatusInternalServerError, code)
-	assert.NotEmpty(t, body["error"])
-}
-
-func unixHTTPClient(path string) *http.Client {
-	return &http.Client{
-		Timeout: time.Second,
-		Transport: &http.Transport{
-			DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
-				return (&net.Dialer{}).DialContext(ctx, "unix", path)
-			},
-		},
-	}
-}
-
-// waitForServe polls until a GET /v1/self through client succeeds
-func waitForServe(t *testing.T, client *http.Client) {
-	t.Helper()
-	waitFor(t, func() bool {
-		resp, err := client.Get("http://hostquery/v1/self")
-		if err != nil {
-			return false
-		}
-		resp.Body.Close()
-		return resp.StatusCode == http.StatusOK
-	})
-}
-
-func skipIfNoUnixSockets(t *testing.T) {
-	t.Helper()
-	if runtime.GOOS == "windows" {
-		t.Skip("unix socket tests are not supported on windows CI")
-	}
-}
-
-func TestInfoAPIServer_unixLifecycle(t *testing.T) {
-	skipIfNoUnixSockets(t)
-	h, c := newTestInfoAPIServer(t)
-	h.pki = newTestPKI(t, "self", []netip.Addr{netip.MustParseAddr("10.0.0.1")})
-
-	sock := filepath.Join(t.TempDir(), "hq.sock")
-	setInfoAPIConfig(c, true, "unix://"+sock, "")
-	require.NoError(t, h.reload(c, true))
-
-	done := make(chan struct{})
-	go func() {
-		h.Start()
-		close(done)
-	}()
-
-	client := unixHTTPClient(sock)
-	waitForServe(t, client)
-
-	fi, err := os.Stat(sock)
-	require.NoError(t, err)
-	assert.Equal(t, fs.FileMode(0o600), fi.Mode().Perm())
-
-	resp, err := client.Get("http://hostquery/v1/host?addr=10.0.0.1")
-	require.NoError(t, err)
-	resp.Body.Close()
-	assert.Equal(t, http.StatusOK, resp.StatusCode)
-
-	h.Stop()
-	select {
-	case <-done:
-	case <-time.After(5 * time.Second):
-		t.Fatal("Start did not return after Stop")
-	}
-	_, err = os.Stat(sock)
-	assert.True(t, os.IsNotExist(err), "socket file should be unlinked on shutdown")
-}
-
-func TestInfoAPIServer_staleSocket(t *testing.T) {
-	skipIfNoUnixSockets(t)
-	h, _ := newTestInfoAPIServer(t)
-	sock := filepath.Join(t.TempDir(), "hq.sock")
-
-	// simulate an unclean exit, a leftover socket file with no listener
-	stale, err := net.ListenUnix("unix", &net.UnixAddr{Name: sock, Net: "unix"})
-	require.NoError(t, err)
-	stale.SetUnlinkOnClose(false)
-	require.NoError(t, stale.Close())
-	_, err = os.Stat(sock)
-	require.NoError(t, err, "stale socket file should exist")
-
-	cfg := infoAPIConfig{addr: sock, socketMode: 0o600}
-	ln, err := h.listen(cfg)
-	require.NoError(t, err, "a stale socket should be removed and rebound")
-	require.NoError(t, ln.Close())
-}
-
-func TestInfoAPIServer_existingFileNotReplaced(t *testing.T) {
-	skipIfNoUnixSockets(t)
-	h, _ := newTestInfoAPIServer(t)
-	path := filepath.Join(t.TempDir(), "hq.sock")
-	require.NoError(t, os.WriteFile(path, []byte("precious"), 0o600))
-
-	cfg := infoAPIConfig{addr: path, socketMode: 0o600}
-	_, err := h.listen(cfg)
-	require.Error(t, err, "a non-socket file at the listen path must not be replaced")
-
-	content, err := os.ReadFile(path)
-	require.NoError(t, err)
-	assert.Equal(t, "precious", string(content))
-}
-
-func TestInfoAPIServer_reload(t *testing.T) {
-	skipIfNoUnixSockets(t)
-	h, c := newTestInfoAPIServer(t)
-	h.pki = newTestPKI(t, "self", []netip.Addr{netip.MustParseAddr("10.0.0.1")})
-	dir := t.TempDir()
-	sock1 := filepath.Join(dir, "hq1.sock")
-	sock2 := filepath.Join(dir, "hq2.sock")
-
-	// initial reload only records config, Control.Start is what launches the runtime
-	setInfoAPIConfig(c, false, "unix://"+sock1, "")
-	require.NoError(t, h.reload(c, true))
-	assert.False(t, h.enabled.Load())
-	h.runMu.Lock()
-	assert.Nil(t, h.run)
-	h.runMu.Unlock()
-
-	// enabling via reload spawns the listener
-	setInfoAPIConfig(c, true, "unix://"+sock1, "")
-	require.NoError(t, h.reload(c, false))
-	waitForServe(t, unixHTTPClient(sock1))
-
-	// changing the listen path restarts on the new address
-	setInfoAPIConfig(c, true, "unix://"+sock2, "")
-	require.NoError(t, h.reload(c, false))
-	waitForServe(t, unixHTTPClient(sock2))
-	waitFor(t, func() bool {
-		_, err := os.Stat(sock1)
-		return os.IsNotExist(err)
-	})
-
-	// reloading an unchanged config does not restart the runtime
-	h.runMu.Lock()
-	rt := h.run
-	h.runMu.Unlock()
-	require.NoError(t, h.reload(c, false))
-	h.runMu.Lock()
-	assert.Same(t, rt, h.run)
-	h.runMu.Unlock()
-
-	// disabling stops the listener
-	setInfoAPIConfig(c, false, "unix://"+sock2, "")
-	require.NoError(t, h.reload(c, false))
-	assert.False(t, h.enabled.Load())
-	waitFor(t, func() bool {
-		h.runMu.Lock()
-		defer h.runMu.Unlock()
-		return h.run == nil
-	})
-}

main.go

@@ -260,8 +260,6 @@ func Main(c *config.C, configTest bool, buildVersion string, l *slog.Logger, dev
 		return nil, util.ContextualizeIfNeeded("Failed to start stats emitter", err)
 	}
 
-	infoAPI := newInfoAPIServerFromConfig(ctx, l, pki, hostMap, c)
-
 	if configTest {
 		return nil, nil
 	}
@@ -281,7 +279,6 @@ func Main(c *config.C, configTest bool, buildVersion string, l *slog.Logger, dev
 		sshStart:               sshStart,
 		statsStart:             stats.Start,
 		dnsStart:               ds.Start,
-		infoAPIStart:           infoAPI.Start,
 		lighthouseStart:        lightHouse.StartUpdateWorker,
 		networkChangeStart:     networkChanges.Start,
 		connectionManagerStart: connManager.Start,

stats.go

@@ -13,7 +13,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	graphite "github.com/cyberdelia/go-metrics-graphite"
 	mp "github.com/nbrownus/go-metrics-prometheus"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -253,7 +252,7 @@ func (s *statsServer) buildRuntime(cfg statsConfig) ([]func(), *http.Server) {
 		// loadStatsConfig already resolved and validated the address; re-parse
 		// the resolved form (no DNS lookup) to get a *net.TCPAddr.
 		addr, _ := net.ResolveTCPAddr(cfg.graphite.protocol, cfg.graphite.resolvedAddr)
-		gcfg := graphite.Config{
+		gcfg := graphiteConfigExport{
 			Addr:          addr,
 			Registry:      metrics.DefaultRegistry,
 			FlushInterval: cfg.interval,
@@ -262,7 +261,7 @@ func (s *statsServer) buildRuntime(cfg statsConfig) ([]func(), *http.Server) {
 			Percentiles:   []float64{0.5, 0.75, 0.95, 0.99, 0.999},
 		}
 		captureFns = append(captureFns, func() {
-			if err := graphite.Once(gcfg); err != nil {
+			if err := graphiteOnce(gcfg); err != nil {
 				s.l.Error("Graphite export failed", "error", err)
 			}
 		})

stats_test.go

@@ -371,7 +371,7 @@ func waitForListening(t *testing.T, addr string) {
 	})
 }
 
-// graphiteSink is a minimal TCP accept-and-discard server so graphite.Once
+// graphiteSink is a minimal TCP accept-and-discard server so graphiteOnce
 // calls in tests don't spam error logs or wedge on connection refused.
 type graphiteSink struct {
 	ln net.Listener