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| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "fmt" |
| 6 | + "math/rand" |
| 7 | + "net" |
| 8 | + "os" |
| 9 | + "strings" |
| 10 | + "sync/atomic" |
| 11 | + "time" |
| 12 | +) |
| 13 | + |
| 14 | +func main() { |
| 15 | + opts := parseArgs(os.Args[1:]) |
| 16 | + |
| 17 | + pendingWorkers := make(chan struct{}, opts.Workers) |
| 18 | + metricGenerators := make([]*metricGenerator, 0, opts.Workers) |
| 19 | + for i := uint(0); i < opts.Workers; i++ { |
| 20 | + generator := &metricGenerator{ |
| 21 | + rnd: rand.New(rand.NewSource(rand.Int63())), |
| 22 | + counters: metricData{ |
| 23 | + nameFormat: fmt.Sprintf("%scounter%s", opts.MetricPrefix, opts.MetricSuffix), |
| 24 | + count: opts.Counts.Counter / uint64(opts.Workers), |
| 25 | + nameCardinality: opts.NameCard.Counter, |
| 26 | + tagCardinality: opts.TagCard.Counter, |
| 27 | + valueLimit: opts.ValueRange.Counter, |
| 28 | + }, |
| 29 | + gauges: metricData{ |
| 30 | + nameFormat: fmt.Sprintf("%sgauge%s", opts.MetricPrefix, opts.MetricSuffix), |
| 31 | + count: opts.Counts.Gauge / uint64(opts.Workers), |
| 32 | + nameCardinality: opts.NameCard.Gauge, |
| 33 | + tagCardinality: opts.TagCard.Gauge, |
| 34 | + valueLimit: opts.ValueRange.Gauge, |
| 35 | + }, |
| 36 | + sets: metricData{ |
| 37 | + nameFormat: fmt.Sprintf("%sset%s", opts.MetricPrefix, opts.MetricSuffix), |
| 38 | + count: opts.Counts.Set / uint64(opts.Workers), |
| 39 | + nameCardinality: opts.NameCard.Set, |
| 40 | + tagCardinality: opts.TagCard.Set, |
| 41 | + valueLimit: opts.ValueRange.Set, |
| 42 | + }, |
| 43 | + timers: metricData{ |
| 44 | + nameFormat: fmt.Sprintf("%stimer%s", opts.MetricPrefix, opts.MetricSuffix), |
| 45 | + count: opts.Counts.Timer / uint64(opts.Workers), |
| 46 | + nameCardinality: opts.NameCard.Timer, |
| 47 | + tagCardinality: opts.TagCard.Timer, |
| 48 | + valueLimit: opts.ValueRange.Timer, |
| 49 | + }, |
| 50 | + } |
| 51 | + metricGenerators = append(metricGenerators, generator) |
| 52 | + go sendMetricsWorker( |
| 53 | + opts.Target, |
| 54 | + opts.DatagramSize, |
| 55 | + opts.Rate/opts.Workers, |
| 56 | + generator, |
| 57 | + pendingWorkers, |
| 58 | + ) |
| 59 | + } |
| 60 | + |
| 61 | + runningWorkers := opts.Workers |
| 62 | + statusTicker := time.NewTicker(1 * time.Second) |
| 63 | + for runningWorkers > 0 { |
| 64 | + select { |
| 65 | + case <-pendingWorkers: |
| 66 | + runningWorkers-- |
| 67 | + case <-statusTicker.C: |
| 68 | + counters := uint64(0) |
| 69 | + gauges := uint64(0) |
| 70 | + sets := uint64(0) |
| 71 | + timers := uint64(0) |
| 72 | + for _, mg := range metricGenerators { |
| 73 | + counters += atomic.LoadUint64(&mg.counters.count) |
| 74 | + gauges += atomic.LoadUint64(&mg.gauges.count) |
| 75 | + sets += atomic.LoadUint64(&mg.sets.count) |
| 76 | + timers += atomic.LoadUint64(&mg.timers.count) |
| 77 | + } |
| 78 | + fmt.Printf("%d counters, %d gauges, %d sets, %d timers\n", counters, gauges, sets, timers) |
| 79 | + } |
| 80 | + } |
| 81 | +} |
| 82 | + |
| 83 | +func sendMetricsWorker( |
| 84 | + address string, |
| 85 | + bufSize uint, |
| 86 | + rate uint, |
| 87 | + generator *metricGenerator, |
| 88 | + chDone chan<- struct{}, |
| 89 | +) { |
| 90 | + s, err := net.DialTimeout("udp", address, 1*time.Second) |
| 91 | + if err != nil { |
| 92 | + panic(err) |
| 93 | + } |
| 94 | + |
| 95 | + b := &bytes.Buffer{} |
| 96 | + |
| 97 | + interval := time.Second / time.Duration(rate) |
| 98 | + |
| 99 | + next := time.Now().Add(interval) |
| 100 | + |
| 101 | + sb := &strings.Builder{} |
| 102 | + for generator.next(sb) { |
| 103 | + if uint(b.Len()+sb.Len()) > bufSize { |
| 104 | + timeToFlush := time.Until(next) |
| 105 | + if timeToFlush > 0 { |
| 106 | + time.Sleep(timeToFlush) |
| 107 | + } |
| 108 | + _, err := s.Write(b.Bytes()) |
| 109 | + if err != nil { |
| 110 | + fmt.Printf("Pausing for 1 second, error sending packet: %v\n", err) |
| 111 | + time.Sleep(1*time.Second) |
| 112 | + } |
| 113 | + b.Reset() |
| 114 | + next = next.Add(interval) |
| 115 | + } |
| 116 | + b.WriteString(sb.String()) |
| 117 | + sb.Reset() |
| 118 | + } |
| 119 | + |
| 120 | + if b.Len() > 0 { |
| 121 | + _, err := s.Write(b.Bytes()) |
| 122 | + if err != nil { |
| 123 | + panic(err) |
| 124 | + } |
| 125 | + } |
| 126 | + chDone <- struct{}{} |
| 127 | +} |
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