fix: missing metrics with Caddy 2.9 (#1366)

* fix missing metrics

* update tests

* use interface instead

caddy/caddy.go

@@ -7,13 +7,13 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/dunglas/frankenphp/internal/fastabs"
-	"github.com/prometheus/client_golang/prometheus"
 	"net/http"
 	"path/filepath"
 	"strconv"
 	"strings"
 
+	"github.com/dunglas/frankenphp/internal/fastabs"
+
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig"
 	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
@@ -40,8 +40,6 @@ func init() {
 	httpcaddyfile.RegisterDirectiveOrder("php_server", "before", "file_server")
 }
 
-var metrics = frankenphp.NewPrometheusMetrics(prometheus.DefaultRegisterer)
-
 type workerConfig struct {
 	// FileName sets the path to the worker script.
 	FileName string `json:"file_name,omitempty"`
@@ -58,6 +56,8 @@ type FrankenPHPApp struct {
 	NumThreads int `json:"num_threads,omitempty"`
 	// Workers configures the worker scripts to start.
 	Workers []workerConfig `json:"workers,omitempty"`
+
+	metrics frankenphp.Metrics
 }
 
 // CaddyModule returns the Caddy module information.
@@ -68,11 +68,18 @@ func (f FrankenPHPApp) CaddyModule() caddy.ModuleInfo {
 	}
 }
 
+// Provision sets up the module.
+func (f *FrankenPHPApp) Provision(ctx caddy.Context) error {
+	f.metrics = frankenphp.NewPrometheusMetrics(ctx.GetMetricsRegistry())
+
+	return nil
+}
+
 func (f *FrankenPHPApp) Start() error {
 	repl := caddy.NewReplacer()
 	logger := caddy.Log()
 
-	opts := []frankenphp.Option{frankenphp.WithNumThreads(f.NumThreads), frankenphp.WithLogger(logger), frankenphp.WithMetrics(metrics)}
+	opts := []frankenphp.Option{frankenphp.WithNumThreads(f.NumThreads), frankenphp.WithLogger(logger), frankenphp.WithMetrics(f.metrics)}
 	for _, w := range f.Workers {
 		opts = append(opts, frankenphp.WithWorkers(repl.ReplaceKnown(w.FileName, ""), w.Num, w.Env, w.Watch))
 	}
@@ -671,6 +678,7 @@ func parsePhpServer(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error)
 // Interface guards
 var (
 	_ caddy.App                   = (*FrankenPHPApp)(nil)
+	_ caddy.Provisioner           = (*FrankenPHPApp)(nil)
 	_ caddy.Provisioner           = (*FrankenPHPModule)(nil)
 	_ caddyhttp.MiddlewareHandler = (*FrankenPHPModule)(nil)
 	_ caddyfile.Unmarshaler       = (*FrankenPHPModule)(nil)

caddy/caddy_test.go

@@ -11,10 +11,10 @@ import (
 	"testing"
 
 	"github.com/dunglas/frankenphp"
-	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/testutil"
 	"github.com/stretchr/testify/require"
 
+	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddytest"
 )
 
@@ -374,7 +374,9 @@ func TestMetrics(t *testing.T) {
 	frankenphp_busy_threads 0
 	`
 
-	require.NoError(t, testutil.GatherAndCompare(prometheus.DefaultGatherer, strings.NewReader(expectedMetrics), "frankenphp_total_threads", "frankenphp_busy_threads"))
+	ctx := caddy.ActiveContext()
+
+	require.NoError(t, testutil.GatherAndCompare(ctx.GetMetricsRegistry(), strings.NewReader(expectedMetrics), "frankenphp_total_threads", "frankenphp_busy_threads"))
 }
 
 func TestWorkerMetrics(t *testing.T) {
@@ -462,9 +464,10 @@ func TestWorkerMetrics(t *testing.T) {
 	frankenphp_testdata_index_php_worker_restarts 0
 	`
 
+	ctx := caddy.ActiveContext()
 	require.NoError(t,
 		testutil.GatherAndCompare(
-			prometheus.DefaultGatherer,
+			ctx.GetMetricsRegistry(),
 			strings.NewReader(expectedMetrics),
 			"frankenphp_total_threads",
 			"frankenphp_busy_threads",
@@ -563,9 +566,10 @@ func TestAutoWorkerConfig(t *testing.T) {
 	frankenphp_testdata_index_php_worker_restarts 0
 	`
 
+	ctx := caddy.ActiveContext()
 	require.NoError(t,
 		testutil.GatherAndCompare(
-			prometheus.DefaultGatherer,
+			ctx.GetMetricsRegistry(),
 			strings.NewReader(expectedMetrics),
 			"frankenphp_total_threads",
 			"frankenphp_busy_threads",