Add attacker

README.md

@@ -8,7 +8,7 @@ Another load testing tool, inspired by [vegeta](https://github.com/tsenart/veget
 
 </div>
 
-Generates HTTP load and plots the results in real-time. `ali` comes with a simple terminal based UI.
+`ali` comes with a simple terminal based UI, lets you generate HTTP requests and plot the results in real-time. With the help of [vegeta](https://github.com/tsenart/vegeta), it's available as a versatile load testing tool.
 
 ## Installation
 

attacker/attacker.go

@@ -0,0 +1,94 @@
+package attacker
+
+import (
+	"net/http"
+	"time"
+
+	vegeta "github.com/tsenart/vegeta/v12/lib"
+)
+
+const (
+	defaultRate     = 50
+	defaultDuration = 30 * time.Second
+	defaultMethod   = http.MethodGet
+)
+
+// Options provides optional settings to attack.
+type Options struct {
+	Rate     int
+	Duration time.Duration
+	Method   string
+	Body     []byte
+	Header   http.Header
+	// TODO: Make attacker pluggable to make it easy unit tests.
+	//Attacker func(vegeta.Targeter, vegeta.Pacer, time.Duration, string) <-chan *vegeta.Result
+}
+
+// Result contains the results of a single Target hit.
+type Result struct {
+	Latency time.Duration
+}
+
+// Attack keeps the request running for the specified period of time.
+// Results are sent to the given channel as soon as they arrive.
+// When the attack is over, it gives back final statistics.
+func Attack(target string, resCh chan *Result, opts Options) *Metrics {
+	if opts.Rate == 0 {
+		opts.Rate = defaultRate
+	}
+	if opts.Duration == 0 {
+		opts.Duration = defaultDuration
+	}
+	if opts.Method == "" {
+		opts.Method = defaultMethod
+	}
+
+	rate := vegeta.Rate{Freq: opts.Rate, Per: time.Second}
+	targeter := vegeta.NewStaticTargeter(vegeta.Target{
+		Method: opts.Method,
+		URL:    target,
+		Body:   opts.Body,
+		Header: opts.Header,
+	})
+	attacker := vegeta.NewAttacker()
+
+	var metrics vegeta.Metrics
+	for res := range attacker.Attack(targeter, rate, opts.Duration, "main") {
+		resCh <- &Result{Latency: res.Latency}
+		metrics.Add(res)
+	}
+	metrics.Close()
+
+	return newMetrics(&metrics)
+}
+
+type (
+	Metrics struct {
+		Latencies LatencyMetrics
+	}
+	LatencyMetrics struct {
+		Total time.Duration
+		Mean  time.Duration
+		P50   time.Duration
+		P90   time.Duration
+		P95   time.Duration
+		P99   time.Duration
+		Max   time.Duration
+		Min   time.Duration
+	}
+)
+
+func newMetrics(m *vegeta.Metrics) *Metrics {
+	return &Metrics{
+		Latencies: LatencyMetrics{
+			Total: m.Latencies.Total,
+			Mean:  m.Latencies.Mean,
+			P50:   m.Latencies.P50,
+			P90:   m.Latencies.P90,
+			P95:   m.Latencies.P95,
+			P99:   m.Latencies.P99,
+			Max:   m.Latencies.Max,
+			Min:   m.Latencies.Min,
+		},
+	}
+}

go.mod

@@ -5,4 +5,5 @@ go 1.15
 require (
 	github.com/mum4k/termdash v0.12.2
 	github.com/spf13/pflag v1.0.5
+	github.com/tsenart/vegeta/v12 v12.8.3
 )

go.sum

@@ -1,17 +1,71 @@
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