feat: add prometheus metrics
This commit is contained in:
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b4c331daa0
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GPG key ID:
B4EF20DDE721CAA1
7 changed files with 110 additions and 9 deletions
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@ -7,6 +7,7 @@ import (
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"net/url"
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"os"
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"codeberg.org/u1f320/pronouns.cc/backend/log"
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"emperror.dev/errors"
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"github.com/Masterminds/squirrel"
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"github.com/jackc/pgx/v5/pgconn"
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@ -14,6 +15,7 @@ import (
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"github.com/mediocregopher/radix/v4"
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"github.com/minio/minio-go/v7"
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"github.com/minio/minio-go/v7/pkg/credentials"
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"github.com/prometheus/client_golang/prometheus"
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)
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var sq = squirrel.StatementBuilder.PlaceholderFormat(squirrel.Dollar)
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@ -32,19 +34,24 @@ type DB struct {
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minio *minio.Client
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minioBucket string
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baseURL *url.URL
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TotalRequests prometheus.Counter
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}
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func New() (*DB, error) {
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log.Debug("creating postgres client")
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pool, err := pgxpool.New(context.Background(), os.Getenv("DATABASE_URL"))
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if err != nil {
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return nil, errors.Wrap(err, "creating postgres client")
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}
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log.Debug("creating redis client")
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redis, err := (&radix.PoolConfig{}).New(context.Background(), "tcp", os.Getenv("REDIS"))
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if err != nil {
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return nil, errors.Wrap(err, "creating redis client")
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}
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log.Debug("creating minio client")
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minioClient, err := minio.New(os.Getenv("MINIO_ENDPOINT"), &minio.Options{
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Creds: credentials.NewStaticV4(os.Getenv("MINIO_ACCESS_KEY_ID"), os.Getenv("MINIO_ACCESS_KEY_SECRET"), ""),
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Secure: os.Getenv("MINIO_SSL") == "true",
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@ -67,6 +74,12 @@ func New() (*DB, error) {
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baseURL: baseURL,
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}
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log.Debug("initializing metrics")
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err = db.initMetrics()
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if err != nil {
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return nil, errors.Wrap(err, "initializing metrics")
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}
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return db, nil
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}
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63
backend/db/metrics.go
Normal file
63
backend/db/metrics.go
Normal file
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@ -0,0 +1,63 @@
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package db
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import (
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"context"
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"codeberg.org/u1f320/pronouns.cc/backend/log"
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"emperror.dev/errors"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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func (db *DB) initMetrics() (err error) {
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err = prometheus.Register(prometheus.NewGaugeFunc(prometheus.GaugeOpts{
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Name: "pronouns_users_total",
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Help: "The total number of registered users",
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}, func() float64 {
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count, err := db.TotalUserCount(context.Background())
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if err != nil {
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log.Errorf("getting user count for metrics: %v", err)
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}
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return float64(count)
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}))
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if err != nil {
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return errors.Wrap(err, "registering user count gauge")
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}
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err = prometheus.Register(prometheus.NewGaugeFunc(prometheus.GaugeOpts{
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Name: "pronouns_members_total",
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Help: "The total number of registered members",
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}, func() float64 {
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count, err := db.TotalMemberCount(context.Background())
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if err != nil {
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log.Errorf("getting member count for metrics: %v", err)
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}
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return float64(count)
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}))
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if err != nil {
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return errors.Wrap(err, "registering member count gauge")
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}
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db.TotalRequests = promauto.NewCounter(prometheus.CounterOpts{
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Name: "pronouns_api_requests_total",
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Help: "The total number of API requests since the last restart",
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})
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return nil
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}
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func (db *DB) TotalUserCount(ctx context.Context) (numUsers int64, err error) {
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err = db.QueryRow(ctx, "SELECT COUNT(*) FROM users WHERE deleted_at IS NULL").Scan(&numUsers)
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if err != nil {
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return 0, errors.Wrap(err, "querying user count")
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}
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return numUsers, nil
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}
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func (db *DB) TotalMemberCount(ctx context.Context) (numMembers int64, err error) {
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err = db.QueryRow(ctx, "SELECT COUNT(*) FROM members WHERE unlisted = false AND user_id = ANY(SELECT id FROM users WHERE deleted_at IS NULL)").Scan(&numMembers)
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if err != nil {
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return 0, errors.Wrap(err, "querying member count")
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}
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return numMembers, nil
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}
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@ -31,13 +31,12 @@ type MetaResponse struct {
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func (s *Server) meta(w http.ResponseWriter, r *http.Request) error {
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ctx := r.Context()
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var numUsers, numMembers int64
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err := s.DB.QueryRow(ctx, "SELECT COUNT(*) FROM users WHERE deleted_at IS NULL").Scan(&numUsers)
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numUsers, err := s.DB.TotalUserCount(ctx)
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if err != nil {
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return errors.Wrap(err, "querying user count")
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}
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err = s.DB.QueryRow(ctx, "SELECT COUNT(*) FROM members WHERE unlisted = false AND user_id = ANY(SELECT id FROM users WHERE deleted_at IS NULL)").Scan(&numMembers)
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numMembers, err := s.DB.TotalMemberCount(ctx)
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if err != nil {
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return errors.Wrap(err, "querying user count")
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}
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@ -6,6 +6,7 @@ import (
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"codeberg.org/u1f320/pronouns.cc/backend/server"
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"github.com/go-chi/chi/v5"
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"github.com/go-chi/render"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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type Server struct {
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@ -23,6 +24,8 @@ func Mount(srv *server.Server, r chi.Router) {
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r.Patch("/reports/{id}", server.WrapHandler(s.resolveReport))
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})
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r.With(MustAdmin).Handle("/metrics", promhttp.Handler())
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r.With(server.MustAuth).Post("/users/{id}/reports", server.WrapHandler(s.createUserReport))
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r.With(server.MustAuth).Post("/members/{id}/reports", server.WrapHandler(s.createMemberReport))
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@ -107,12 +107,17 @@ func New() (*Server, error) {
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rateLimiter.Scope("*", "/auth/invites", 10)
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rateLimiter.Scope("POST", "/auth/discord/*", 10)
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// rate limit handling
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// - 120 req/minute (2/s)
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// - keyed by Authorization header if valid token is provided, otherwise by IP
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// - returns rate limit reset info in error
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s.Router.Use(rateLimiter.Handler())
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// increment the total requests counter whenever a request is made
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s.Router.Use(func(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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s.DB.TotalRequests.Inc()
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next.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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})
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// return an API error for not found + method not allowed
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s.Router.NotFound(func(w http.ResponseWriter, r *http.Request) {
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render.Status(r, errCodeStatuses[ErrNotFound])
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8
go.mod
8
go.mod
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@ -10,6 +10,7 @@ require (
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github.com/disintegration/imaging v1.6.2
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github.com/georgysavva/scany/v2 v2.0.0
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github.com/go-chi/chi/v5 v5.0.8
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github.com/go-chi/cors v1.2.1
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github.com/go-chi/httprate v0.7.1
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github.com/go-chi/render v1.0.2
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github.com/gobwas/glob v0.2.3
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@ -18,6 +19,7 @@ require (
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github.com/joho/godotenv v1.5.1
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github.com/mediocregopher/radix/v4 v4.1.2
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github.com/minio/minio-go/v7 v7.0.50
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github.com/prometheus/client_golang v1.15.0
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github.com/rs/xid v1.4.0
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github.com/rubenv/sql-migrate v1.4.0
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github.com/urfave/cli/v2 v2.25.1
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@ -27,10 +29,10 @@ require (
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require (
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github.com/ajg/form v1.5.1 // indirect
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github.com/beorn7/perks v1.0.1 // indirect
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github.com/cespare/xxhash/v2 v2.2.0 // indirect
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github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
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github.com/dustin/go-humanize v1.0.1 // indirect
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github.com/go-chi/cors v1.2.1 // indirect
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github.com/go-gorp/gorp/v3 v3.1.0 // indirect
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github.com/golang/protobuf v1.5.3 // indirect
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github.com/google/uuid v1.3.0 // indirect
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@ -43,11 +45,15 @@ require (
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github.com/klauspost/cpuid/v2 v2.2.4 // indirect
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github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 // indirect
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github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 // indirect
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github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
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github.com/minio/md5-simd v1.1.2 // indirect
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github.com/minio/sha256-simd v1.0.0 // indirect
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github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
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github.com/modern-go/reflect2 v1.0.2 // indirect
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github.com/pkg/errors v0.9.1 // indirect
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github.com/prometheus/client_model v0.3.0 // indirect
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github.com/prometheus/common v0.42.0 // indirect
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github.com/prometheus/procfs v0.9.0 // indirect
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github.com/russross/blackfriday/v2 v2.1.0 // indirect
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github.com/sirupsen/logrus v1.9.0 // indirect
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github.com/stretchr/objx v0.5.0 // indirect
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14
go.sum
14
go.sum
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@ -63,6 +63,8 @@ github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgI
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github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
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github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
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github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
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github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
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github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
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github.com/bketelsen/crypt v0.0.4/go.mod h1:aI6NrJ0pMGgvZKL1iVgXLnfIFJtfV+bKCoqOes/6LfM=
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github.com/bwmarrin/discordgo v0.27.1 h1:ib9AIc/dom1E/fSIulrBwnez0CToJE113ZGt4HoliGY=
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@ -201,7 +203,7 @@ github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
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github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
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github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
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github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
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github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
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github.com/google/martian/v3 v3.0.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=
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@ -336,6 +338,8 @@ github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m
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github.com/mattn/go-sqlite3 v1.14.15 h1:vfoHhTN1af61xCRSWzFIWzx2YskyMTwHLrExkBOjvxI=
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github.com/mattn/go-sqlite3 v1.14.15/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
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github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
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github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zkfA9PSy5pEvNWRP0ET0TIVo=
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github.com/matttproud/golang_protobuf_extensions v1.0.4/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
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github.com/mediocregopher/radix/v4 v4.1.2 h1:Pj7XnNK5WuzzFy63g98pnccainAePK+aZNQRvxSvj2I=
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github.com/mediocregopher/radix/v4 v4.1.2/go.mod h1:ajchozX/6ELmydxWeWM6xCFHVpZ4+67LXHOTOVR0nCE=
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github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
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@ -389,13 +393,21 @@ github.com/poy/onpar v1.1.2 h1:QaNrNiZx0+Nar5dLgTVp5mXkyoVFIbepjyEoGSnhbAY=
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github.com/poy/onpar v1.1.2/go.mod h1:6X8FLNoxyr9kkmnlqpK6LSoiOtrO6MICtWwEuWkLjzg=
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github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
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github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
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github.com/prometheus/client_golang v1.15.0 h1:5fCgGYogn0hFdhyhLbw7hEsWxufKtY9klyvdNfFlFhM=
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github.com/prometheus/client_golang v1.15.0/go.mod h1:e9yaBhRPU2pPNsZwE+JdQl0KEt1N9XgF6zxWmaC0xOk=
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github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
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github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
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github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
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github.com/prometheus/client_model v0.3.0 h1:UBgGFHqYdG/TPFD1B1ogZywDqEkwp3fBMvqdiQ7Xew4=
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github.com/prometheus/client_model v0.3.0/go.mod h1:LDGWKZIo7rky3hgvBe+caln+Dr3dPggB5dvjtD7w9+w=
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github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
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github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
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github.com/prometheus/common v0.42.0 h1:EKsfXEYo4JpWMHH5cg+KOUWeuJSov1Id8zGR8eeI1YM=
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github.com/prometheus/common v0.42.0/go.mod h1:xBwqVerjNdUDjgODMpudtOMwlOwf2SaTr1yjz4b7Zbc=
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github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
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github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
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github.com/prometheus/procfs v0.9.0 h1:wzCHvIvM5SxWqYvwgVL7yJY8Lz3PKn49KQtpgMYJfhI=
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github.com/prometheus/procfs v0.9.0/go.mod h1:+pB4zwohETzFnmlpe6yd2lSc+0/46IYZRB/chUwxUZY=
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github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
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github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
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github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
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