Add option to export metrics from asynqmon

cmd/asynqmon/main.go

@@ -12,24 +12,27 @@ import (
 	"time"
 
 	"github.com/go-redis/redis/v8"
-	"github.com/rs/cors"
-
 	"github.com/hibiken/asynq"
+	"github.com/hibiken/asynq/x/metrics"
 	"github.com/hibiken/asynqmon"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/rs/cors"
 )
 
 // Command-line flags
 var (
-	flagPort              int
+	flagPort                  int
-	flagRedisAddr         string
+	flagRedisAddr             string
-	flagRedisDB           int
+	flagRedisDB               int
-	flagRedisPassword     string
+	flagRedisPassword         string
-	flagRedisTLS          string
+	flagRedisTLS              string
-	flagRedisURL          string
+	flagRedisURL              string
-	flagRedisInsecureTLS  bool
+	flagRedisInsecureTLS      bool
-	flagRedisClusterNodes string
+	flagRedisClusterNodes     string
-	flagMaxPayloadLength  int
+	flagMaxPayloadLength      int
-	flagMaxResultLength   int
+	flagMaxResultLength       int
+	flagEnableMetricsExporter bool
 )
 
 func init() {
@@ -37,12 +40,13 @@ func init() {
 	flag.StringVar(&flagRedisAddr, "redis-addr", getEnvDefaultString("REDIS_ADDR", "127.0.0.1:6379"), "address of redis server to connect to")
 	flag.IntVar(&flagRedisDB, "redis-db", getEnvOrDefaultInt("REDIS_DB", 0), "redis database number")
 	flag.StringVar(&flagRedisPassword, "redis-password", getEnvDefaultString("REDIS_PASSWORD", ""), "password to use when connecting to redis server")
-	flag.StringVar(&flagRedisTLS, "redis-tls", getEnvDefaultString("REDIS_TLS",""), "server name for TLS validation used when connecting to redis server")
+	flag.StringVar(&flagRedisTLS, "redis-tls", getEnvDefaultString("REDIS_TLS", ""), "server name for TLS validation used when connecting to redis server")
 	flag.StringVar(&flagRedisURL, "redis-url", getEnvDefaultString("REDIS_URL", ""), "URL to redis server")
 	flag.BoolVar(&flagRedisInsecureTLS, "redis-insecure-tls", getEnvOrDefaultBool("REDIS_INSECURE_TLS", false), "disable TLS certificate host checks")
 	flag.StringVar(&flagRedisClusterNodes, "redis-cluster-nodes", getEnvDefaultString("REDIS_CLUSTER_NODES", ""), "comma separated list of host:port addresses of cluster nodes")
 	flag.IntVar(&flagMaxPayloadLength, "max-payload-length", getEnvOrDefaultInt("MAX_PAYLOAD_LENGTH", 200), "maximum number of utf8 characters printed in the payload cell in the Web UI")
 	flag.IntVar(&flagMaxResultLength, "max-result-length", getEnvOrDefaultInt("MAX_RESULT_LENGTH", 200), "maximum number of utf8 characters printed in the result cell in the Web UI")
+	flag.BoolVar(&flagEnableMetricsExporter, "enable-metrics-exporter", getEnvOrDefaultBool("ENABLE_METRICS_EXPORTER", false), "enable prometheus metrics exporter to expose queue metrics")
 }
 
 // TODO: Write test and refactor this code.
@@ -113,9 +117,25 @@ func main() {
 	c := cors.New(cors.Options{
 		AllowedMethods: []string{"GET", "POST", "DELETE"},
 	})
+	mux := http.NewServeMux()
+	mux.Handle("/", c.Handler(h))
+	if flagEnableMetricsExporter {
+		// Using NewPedanticRegistry here to test the implementation of Collectors and Metrics.
+		reg := prometheus.NewPedanticRegistry()
+
+		inspector := asynq.NewInspector(redisConnOpt)
+
+		reg.MustRegister(
+			metrics.NewBrokerMetricsCollector(inspector),
+			// Add the standard process and go metrics to the registry
+			prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}),
+			prometheus.NewGoCollector(),
+		)
+		mux.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
+	}
 
 	srv := &http.Server{
-		Handler:      c.Handler(h),
+		Handler:      mux,
 		Addr:         fmt.Sprintf(":%d", flagPort),
 		WriteTimeout: 10 * time.Second,
 		ReadTimeout:  10 * time.Second,
@@ -149,7 +169,7 @@ func truncate(s string, limit int) string {
 
 func getEnvDefaultString(key, def string) string {
 	v := os.Getenv(key)
-	if (v == "") {
+	if v == "" {
 		return def
 	}
 
@@ -158,7 +178,7 @@ func getEnvDefaultString(key, def string) string {
 
 func getEnvOrDefaultInt(key string, def int) int {
 	v, err := strconv.Atoi(os.Getenv(key))
-	if (err != nil) {
+	if err != nil {
 		return def
 	}
 	return v
@@ -166,8 +186,8 @@ func getEnvOrDefaultInt(key string, def int) int {
 
 func getEnvOrDefaultBool(key string, def bool) bool {
 	v, err := strconv.ParseBool(os.Getenv(key))
-	if (err != nil) {
+	if err != nil {
 		return def
 	}
 	return v
-}
+}

go.mod

@@ -3,9 +3,12 @@ module github.com/hibiken/asynqmon
 go 1.16
 
 require (
-	github.com/go-redis/redis/v8 v8.11.3
+	github.com/go-redis/redis/v8 v8.11.4
 	github.com/gorilla/mux v1.8.0
 	github.com/hibiken/asynq v0.19.0
+	github.com/hibiken/asynq/x v0.1.0
+	github.com/prometheus/client_golang v1.11.0 // indirect
 	github.com/rs/cors v1.7.0
 )
 
+replace github.com/hibiken/asynq/x => ./../../../database/Redis/go/asynq/x

go.sum

@@ -1,11 +1,23 @@
 cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
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+github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
+github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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@@ -20,16 +32,27 @@ github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7
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@@ -38,6 +61,7 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
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@@ -46,11 +70,15 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
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@@ -59,12 +87,29 @@ github.com/hibiken/asynq v0.19.0 h1:AoJhoivymyFhF92ZAmVzxd7jr0RM264HdgkbjPc+x+M=
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@@ -98,6 +171,7 @@ github.com/yuin/goldmark v1.2.1 h1:ruQGxdhGHe7FWOJPT0mKs5+pD2Xs1Bm/kdGlHO04FmM=
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@@ -113,38 +187,56 @@ golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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@@ -186,6 +278,7 @@ google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlba
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@@ -193,8 +286,10 @@ gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
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