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197 lines
5.8 KiB
197 lines
5.8 KiB
//
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// Written by Maxim Khitrov (November 2012)
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//
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package flowrate
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import (
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"bytes"
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"testing"
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"time"
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)
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const (
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_50ms = 50 * time.Millisecond
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_100ms = 100 * time.Millisecond
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_200ms = 200 * time.Millisecond
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_300ms = 300 * time.Millisecond
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_400ms = 400 * time.Millisecond
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_500ms = 500 * time.Millisecond
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)
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func nextStatus(m *Monitor) Status {
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samples := m.samples
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for i := 0; i < 30; i++ {
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if s := m.Status(); s.Samples != samples {
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return s
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}
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time.Sleep(5 * time.Millisecond)
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}
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return m.Status()
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}
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func TestReader(t *testing.T) {
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in := make([]byte, 100)
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for i := range in {
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in[i] = byte(i)
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}
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b := make([]byte, 100)
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r := NewReader(bytes.NewReader(in), 100)
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start := time.Now()
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// Make sure r implements Limiter
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_ = Limiter(r)
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// 1st read of 10 bytes is performed immediately
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if n, err := r.Read(b); n != 10 || err != nil {
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t.Fatalf("r.Read(b) expected 10 (<nil>); got %v (%v)", n, err)
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} else if rt := time.Since(start); rt > _50ms {
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t.Fatalf("r.Read(b) took too long (%v)", rt)
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}
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// No new Reads allowed in the current sample
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r.SetBlocking(false)
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if n, err := r.Read(b); n != 0 || err != nil {
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t.Fatalf("r.Read(b) expected 0 (<nil>); got %v (%v)", n, err)
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} else if rt := time.Since(start); rt > _50ms {
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t.Fatalf("r.Read(b) took too long (%v)", rt)
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}
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status := [6]Status{0: r.Status()} // No samples in the first status
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// 2nd read of 10 bytes blocks until the next sample
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r.SetBlocking(true)
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if n, err := r.Read(b[10:]); n != 10 || err != nil {
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t.Fatalf("r.Read(b[10:]) expected 10 (<nil>); got %v (%v)", n, err)
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} else if rt := time.Since(start); rt < _100ms {
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t.Fatalf("r.Read(b[10:]) returned ahead of time (%v)", rt)
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}
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status[1] = r.Status() // 1st sample
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status[2] = nextStatus(r.Monitor) // 2nd sample
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status[3] = nextStatus(r.Monitor) // No activity for the 3rd sample
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if n := r.Done(); n != 20 {
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t.Fatalf("r.Done() expected 20; got %v", n)
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}
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status[4] = r.Status()
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status[5] = nextStatus(r.Monitor) // Timeout
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start = status[0].Start
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// Active, Bytes, Samples, InstRate, CurRate, AvgRate, PeakRate, BytesRem, Start, Duration, Idle, TimeRem, Progress
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want := []Status{
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{start, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, true},
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{start, 10, 1, 100, 100, 100, 100, 0, _100ms, 0, 0, 0, true},
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{start, 20, 2, 100, 100, 100, 100, 0, _200ms, _100ms, 0, 0, true},
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{start, 20, 3, 0, 90, 67, 100, 0, _300ms, _200ms, 0, 0, true},
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{start, 20, 3, 0, 0, 67, 100, 0, _300ms, 0, 0, 0, false},
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{start, 20, 3, 0, 0, 67, 100, 0, _300ms, 0, 0, 0, false},
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}
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for i, s := range status {
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s := s
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if !statusesAreEqual(&s, &want[i]) {
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t.Errorf("r.Status(%v)\nexpected: %v\ngot : %v", i, want[i], s)
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}
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}
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if !bytes.Equal(b[:20], in[:20]) {
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t.Errorf("r.Read() input doesn't match output")
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}
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}
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func TestWriter(t *testing.T) {
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b := make([]byte, 100)
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for i := range b {
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b[i] = byte(i)
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}
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w := NewWriter(&bytes.Buffer{}, 200)
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start := time.Now()
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// Make sure w implements Limiter
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_ = Limiter(w)
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// Non-blocking 20-byte write for the first sample returns ErrLimit
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w.SetBlocking(false)
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if n, err := w.Write(b); n != 20 || err != ErrLimit {
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t.Fatalf("w.Write(b) expected 20 (ErrLimit); got %v (%v)", n, err)
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} else if rt := time.Since(start); rt > _50ms {
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t.Fatalf("w.Write(b) took too long (%v)", rt)
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}
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// Blocking 80-byte write
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w.SetBlocking(true)
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if n, err := w.Write(b[20:]); n != 80 || err != nil {
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t.Fatalf("w.Write(b[20:]) expected 80 (<nil>); got %v (%v)", n, err)
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} else if rt := time.Since(start); rt < _300ms {
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// Explanation for `rt < _300ms` (as opposed to `< _400ms`)
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//
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// |<-- start | |
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// epochs: -----0ms|---100ms|---200ms|---300ms|---400ms
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// sends: 20|20 |20 |20 |20#
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//
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// NOTE: The '#' symbol can thus happen before 400ms is up.
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// Thus, we can only panic if rt < _300ms.
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t.Fatalf("w.Write(b[20:]) returned ahead of time (%v)", rt)
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}
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w.SetTransferSize(100)
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status := []Status{w.Status(), nextStatus(w.Monitor)}
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start = status[0].Start
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// Active, Bytes, Samples, InstRate, CurRate, AvgRate, PeakRate, BytesRem, Start, Duration, Idle, TimeRem, Progress
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want := []Status{
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{start, 80, 4, 200, 200, 200, 200, 20, _400ms, 0, _100ms, 80000, true},
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{start, 100, 5, 200, 200, 200, 200, 0, _500ms, _100ms, 0, 100000, true},
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}
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for i, s := range status {
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s := s
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if !statusesAreEqual(&s, &want[i]) {
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t.Errorf("w.Status(%v)\nexpected: %v\ngot : %v\n", i, want[i], s)
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}
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}
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if !bytes.Equal(b, w.Writer.(*bytes.Buffer).Bytes()) {
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t.Errorf("w.Write() input doesn't match output")
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}
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}
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const maxDeviationForDuration = 50 * time.Millisecond
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const maxDeviationForRate int64 = 50
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// statusesAreEqual returns true if s1 is equal to s2. Equality here means
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// general equality of fields except for the duration and rates, which can
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// drift due to unpredictable delays (e.g. thread wakes up 25ms after
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// `time.Sleep` has ended).
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func statusesAreEqual(s1 *Status, s2 *Status) bool {
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if s1.Active == s2.Active &&
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s1.Start == s2.Start &&
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durationsAreEqual(s1.Duration, s2.Duration, maxDeviationForDuration) &&
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s1.Idle == s2.Idle &&
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s1.Bytes == s2.Bytes &&
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s1.Samples == s2.Samples &&
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ratesAreEqual(s1.InstRate, s2.InstRate, maxDeviationForRate) &&
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ratesAreEqual(s1.CurRate, s2.CurRate, maxDeviationForRate) &&
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ratesAreEqual(s1.AvgRate, s2.AvgRate, maxDeviationForRate) &&
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ratesAreEqual(s1.PeakRate, s2.PeakRate, maxDeviationForRate) &&
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s1.BytesRem == s2.BytesRem &&
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durationsAreEqual(s1.TimeRem, s2.TimeRem, maxDeviationForDuration) &&
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s1.Progress == s2.Progress {
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return true
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}
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return false
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}
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func durationsAreEqual(d1 time.Duration, d2 time.Duration, maxDeviation time.Duration) bool {
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return d2-d1 <= maxDeviation
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}
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func ratesAreEqual(r1 int64, r2 int64, maxDeviation int64) bool {
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sub := r1 - r2
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if sub < 0 {
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sub = -sub
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}
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if sub <= maxDeviation {
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return true
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}
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return false
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}
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