lib/prom: follow-up fixes to #534

Signed-off-by: Tomás Senart <tsenart@gmail.com>

README.md

@@ -864,11 +864,11 @@ $ ulimit -u # processes / threads
 
 Just pass a new number as the argument to change it.
 
-## Prometheus Support
+## Prometheus support
 
-Vegeta has a built-in Prometheus Exporter that may be enabled during attacks so that you can point any Prometheus instance to Vegeta instances and get some metrics about http requests performance and about the Vegeta process itself.
+Vegeta has a built-in Prometheus Exporter that may be enabled during attacks so that you can point any Prometheus instance to Vegeta attack processes and monitor attack metrics.
 
-To enable the Prometheus Exporter on the command line, use the "prometheus-addr" flag.
+To enable the Prometheus Exporter on the command line, set the "prometheus-addr" flag.
 
 A Prometheus HTTP endpoint will be available only during the lifespan of an attack and will be closed right after the attack is finished.
 
@@ -877,53 +877,22 @@ The following metrics are exposed:
 * `request_bytes_in` - bytes count received from targeted servers by "url", "method" and "status"
 * `request_bytes_out` - bytes count sent to targeted server by "url", "method" and "status"
 * `request_seconds` - histogram with request latency and counters by "url", "method" and "status"
+* `request_fail_count` - count of failed requests by "url", "method", "status" and "message"
 
-<image src="prometheus-sample.png" width="500" />
+<image src="lib/prom/prometheus-sample.png" width="500" />
 
 Check file [lib/prom/grafana.json](lib/prom/grafana.json) with the source of this sample dashboard in Grafana.
 
-### Samples
+### Limitations
 
-If you want to query P90 quantiles, for example, use "histogram_quantile(0.90, sum(rate(request_seconds_bucket[1m])) by (le, status))"
+1. Prometheus scrapes metrics from a running vegeta attack process and assigns timestamps to samples on its server. This means result timestamps aren't accurate (i.e. they're scraping time, not result time).
+2. Configuring Prometheus to scrape vegeta needs to happen out-of-band. That's a hassle!
+3. Since there's no coordination between a vegeta attack process and a Prometheus server, an attack process will finish before Prometheus has the chance to scrape the latest observations.
 
-### Prometheus Exporter example
 
-* Create a docker-compose.yml
+Why aren't we using pushgateway instead? See [this comment](https://github.com/tsenart/vegeta/pull/534#issuecomment-1629943731).
 
-```
-version: '3.5'
-services:
-  vegeta:
-    image: tsenart/vegeta
-    ports:
-      - 8880:8880
-    command: sh -c 'echo "GET https://www.yahoo.com" | vegeta attack -duration=30s -rate=5 -prometheus-addr=0.0.0.0:8880'
-
-  prometheus:
-    image: flaviostutz/prometheus:2.19.2.0
-    ports:
-      - 9090:9090
-    environment:
-      - SCRAPE_INTERVAL=10s
-      - SCRAPE_TIMEOUT=10s
-      - STATIC_SCRAPE_TARGETS=vegeta@vegeta:8880
-```
-
-* Run `docker-compose up -d`
-
-* Run `curl localhost:8880` to see plain Prometheus Exporter endpoint contents
-
-* Open Prometheus server instance with your browser at http://localhost:9090
-
-* Go to "Graph" and execute query `rate(request_seconds_sum[1m])` and then select the "Graph" tab to see a graph with latency over time
-
-#### More resources
-
-* See https://prometheus.io/docs/prometheus/latest/querying/basics/ for query details
-
-* Use Grafana for creating stateful dashboards. Get a sample dashboard for Vegeta [here](grafana.json)
-
-* For more elaborated scenarios, see https://github.com/flaviostutz/promster so that you can automatically register new Vegeta Prometheus Exporter instances to Prometheus in elastic scenarios.
+There's [an issue](https://github.com/tsenart/vegeta/issues/637) tracking the proper solution to all these limitations which is a remote write integration.
 
 ## License
 

attack.go

@@ -183,20 +183,22 @@ func attack(opts *attackOpts) (err error) {
 		return err
 	}
 
-	// Start Prometheus Metrics and Server
 	var pm *prom.Metrics
 	if opts.promAddr != "" {
+		pm = prom.NewMetrics()
+
 		r := prometheus.NewRegistry()
-		pm, err = prom.NewMetrics(r)
-		if err != nil {
-			return err
+		if err := pm.Register(r); err != nil {
+			return fmt.Errorf("error registering prometheus metrics: %s", err)
 		}
-		srv, err := prom.StartPromServer(opts.promAddr, r)
-		if err != nil {
-			return err
+
+		srv := http.Server{
+			Addr:    opts.promAddr,
+			Handler: prom.NewHandler(r, time.Now().UTC()),
 		}
 
 		defer srv.Close()
+		go srv.ListenAndServe()
 	}
 
 	atk := vegeta.NewAttacker(
@@ -245,9 +247,11 @@ func processAttack(
 			if !ok {
 				return nil
 			}
+
 			if pm != nil {
 				pm.Observe(r)
 			}
+
 			if err := enc.Encode(r); err != nil {
 				return err
 			}

go.mod

@@ -23,13 +23,17 @@ require (
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/grafana/regexp v0.0.0-20221122212121-6b5c0a4cb7fd // indirect
 	github.com/iancoleman/orderedmap v0.3.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
-	github.com/prometheus/client_model v0.3.0 // indirect
-	github.com/prometheus/common v0.42.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/prometheus/client_model v0.4.0 // indirect
+	github.com/prometheus/common v0.44.0 // indirect
 	github.com/prometheus/procfs v0.10.1 // indirect
+	github.com/prometheus/prometheus v0.45.0 // indirect
 	golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1 // indirect
 	golang.org/x/mod v0.12.0 // indirect
 	golang.org/x/sync v0.3.0 // indirect

go.sum

@@ -16,6 +16,8 @@ github.com/dgryski/go-gk v0.0.0-20200319235926-a69029f61654/go.mod h1:qm+vckxRlD
 github.com/dgryski/go-lttb v0.0.0-20230207170358-f8fc36cdbff1 h1:dxwR3CStJdJamsIoMPCmxuIfBAPTgmzvFax+MvFav3M=
 github.com/dgryski/go-lttb v0.0.0-20230207170358-f8fc36cdbff1/go.mod h1:UwftcHUI/qTYvLAxrWmANuRckf8+08O3C3hwStvkhDU=
 github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
+github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.5/go.mod h1:6O5/vntMXwX2lRkT1hjjk0nAC1IDOTvTlVgjlRvqsdk=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
@@ -25,6 +27,8 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/grafana/regexp v0.0.0-20221122212121-6b5c0a4cb7fd h1:PpuIBO5P3e9hpqBD0O/HjhShYuM6XE0i/lbE6J94kww=
+github.com/grafana/regexp v0.0.0-20221122212121-6b5c0a4cb7fd/go.mod h1:M5qHK+eWfAv8VR/265dIuEpL3fNfeC21tXXp9itM24A=
 github.com/iancoleman/orderedmap v0.0.0-20190318233801-ac98e3ecb4b0/go.mod h1:N0Wam8K1arqPXNWjMo21EXnBPOPp36vB07FNRdD2geA=
 github.com/iancoleman/orderedmap v0.3.0 h1:5cbR2grmZR/DiVt+VJopEhtVs9YGInGIxAoMJn+Ichc=
 github.com/iancoleman/orderedmap v0.3.0/go.mod h1:XuLcCUkdL5owUCQeF2Ue9uuw1EptkJDkXXS7VoV7XGE=
@@ -35,6 +39,8 @@ github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFF
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
 github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
+github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
 github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
 github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zkfA9PSy5pEvNWRP0ET0TIVo=
@@ -44,16 +50,24 @@ github.com/miekg/dns v1.1.55/go.mod h1:uInx36IzPl7FYnDcMeVWxj9byh7DutNykX4G9Sj60
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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@@ -62,25 +76,50 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
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