Started down a different path; using a circular buffer instead.
After talks on #go-nuts, it seems as though I should look into using something like the following: https://github.com/cespare/goproc/tree/master/nwstat And this makes sense. I have trimmed out the old tests and rearranged some code here.
This commit is contained in:
parent
c33a5561bb
commit
bb8ce3c1ea
122
bandwidth.go
122
bandwidth.go
@ -3,9 +3,9 @@
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package bandwidth
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import (
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"container/list"
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"errors"
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"fmt"
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"log"
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"sort"
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"time"
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)
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@ -27,17 +27,26 @@ type Bandwidth struct {
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rxSnap []float64
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txSnap []float64
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dt time.Duration
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rxstream *stream
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txstream *stream
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curRx int
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curTx int
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rxstream []int
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txstream []int
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timeI int
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max int
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}
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// NewBandwidth Returns a populated and ready to launch Bandwidth. seconds is
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// a slice of seconds on which to report (e.g. 1, 10, 60 seconds). dt is how
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// often the values used to send to Rx and Tx are updated.
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func NewBandwidth(seconds []int, dt time.Duration) (*Bandwidth, error) {
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if len(seconds) < 1 {
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func NewBandwidth(dts []int, dt time.Duration) (*Bandwidth, error) {
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if len(dts) < 1 {
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return nil, errors.New("must specify at least one interval lenght")
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}
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sort.Ints(dts)
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max := dts[len(dts)-1]
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r := &Bandwidth{
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AddRx: make(chan int, 1024),
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AddTx: make(chan int, 1024),
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@ -45,8 +54,9 @@ func NewBandwidth(seconds []int, dt time.Duration) (*Bandwidth, error) {
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Tx: make(chan []float64),
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dt: dt,
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Quit: make(chan interface{}),
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rxstream: newStream(seconds),
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txstream: newStream(seconds),
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rxstream: make([]int, max),
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txstream: make([]int, max),
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max: max,
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}
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return r, nil
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}
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@ -59,14 +69,17 @@ outer:
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for {
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select {
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case <-t.C:
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bw.rxSnap = bw.rxstream.averages()
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bw.txSnap = bw.txstream.averages()
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bw.rxSnap = bw.averages(bw.rxstream)
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bw.txSnap = bw.averages(bw.txstream)
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bw.curTx = 0
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bw.curRx = 0
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bw.timeI += 1
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case bw.Rx <- bw.rxSnap:
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case bw.Tx <- bw.txSnap:
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case s := <-bw.AddRx:
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bw.rxstream.add(datum{float64(s), time.Now()})
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bw.curTx += s
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case s := <-bw.AddTx:
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bw.txstream.add(datum{float64(s), time.Now()})
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bw.curRx += s
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case <-bw.Quit:
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break outer
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}
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@ -77,86 +90,9 @@ outer:
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close(bw.Tx)
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}
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// datum stores both a piece of info, plus the time at which that info was
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// collected.
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type datum struct {
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value float64
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at time.Time
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func (bw *Bandwidth) averages(state []int) []float64 {
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for i := 0; i < bw.max; i++ {
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log.Println(bw.timeI + i)
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}
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func (d datum) String() string {
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r := struct {
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value string
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at string
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}{
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value: fmt.Sprintf("%04f", d.value),
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at: fmt.Sprintf("%s", d.at),
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}
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return fmt.Sprintf("%+v", r)
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}
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// stream manages a list of datum, and prunes itself on add
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type stream struct {
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data *list.List
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extents []time.Duration
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max time.Duration
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}
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func newStream(seconds []int) *stream {
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extents := []time.Duration{}
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for _, s := range seconds {
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extents = append(extents, time.Duration(-s)*time.Second)
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}
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max := extents[len(extents)-1]
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return &stream{
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data: list.New(),
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extents: extents,
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max: max,
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}
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}
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func (s *stream) add(v datum) {
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s.data.PushBack(v)
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}
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func (s *stream) averages() []float64 {
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var limit time.Time
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total := 0.0
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totals := []float64{}
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if s.data.Back() == nil {
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return totals
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}
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now := time.Now()
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cutoff := now.Add(s.max)
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for e := s.data.Front(); e != nil; e = e.Next() {
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cur := e.Value.(datum).at
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if cur.Before(cutoff) {
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s.data.Remove(e)
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} else {
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break
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}
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}
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e := s.data.Back()
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for _, extent := range s.extents {
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limit = now.Add(extent)
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for ; e != nil; e = e.Prev() {
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if e.Prev() == nil {
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break
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}
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next := e.Prev().Value.(datum)
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if next.at.Before(limit) {
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break
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}
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cur := e.Value.(datum)
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total += cur.value
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}
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totals = append(totals, total/float64(-int(extent/time.Second)))
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}
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return totals
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return nil
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}
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@ -10,35 +10,6 @@ func init() {
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log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
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}
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func general(t *testing.T) {
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bw, err := NewBandwidth([]int{1, 10, 60}, 100*time.Millisecond)
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if err != nil {
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t.Error(err)
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}
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go bw.Run()
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bw.AddRx <- 10
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bw.AddTx <- 10
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time.Sleep(1 * time.Second)
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log.Printf("%+v", <-bw.Rx)
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log.Printf("%+v", <-bw.Tx)
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for i := 0; i < 10; i++ {
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bw.AddRx <- (10 * i)
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bw.AddRx <- (10 * i)
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time.Sleep(500 * time.Millisecond)
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log.Printf("%+v", <-bw.Rx)
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log.Printf("%+v", <-bw.Tx)
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}
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log.Printf("%+v", <-bw.Rx)
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log.Printf("%+v", <-bw.Tx)
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time.Sleep(10 * time.Second)
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log.Printf("%+v", <-bw.Rx)
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log.Printf("%+v", <-bw.Tx)
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close(bw.Quit)
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time.Sleep(100 * time.Millisecond)
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log.Printf("%+v", <-bw.Rx)
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log.Printf("%+v", <-bw.Tx)
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}
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func validate(t *testing.T, actual, expected []float64) {
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if len(actual) != len(expected) {
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t.Errorf("len is not same: %d expected %d", len(actual), len(expected))
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@ -50,64 +21,14 @@ func validate(t *testing.T, actual, expected []float64) {
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}
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}
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func TestOncePerSecond(t *testing.T) {
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bw, err := NewBandwidth([]int{1, 10, 60}, 100*time.Millisecond)
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if err != nil {
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t.Error(err)
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}
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bw.rxstream = newStream([]int{1, 10, 60})
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var i int64 = 0
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for ; i < 1000; i++ {
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d := datum{
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value: 1.0,
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at: time.Unix(1234567890+i, 0),
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}
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bw.rxstream.add(d)
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}
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validate(t, bw.rxstream.averages(), []float64{1.0, 1.0, 1.0})
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}
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func TestOneOverManySeconds(t *testing.T) {
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bw, err := NewBandwidth([]int{1, 10, 60}, 100*time.Millisecond)
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if err != nil {
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t.Error(err)
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}
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bw.rxstream = newStream([]int{1, 10, 60})
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var i int64 = 0
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for ; i < 1000; i++ {
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d := datum{
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value: 1.0,
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at: time.Unix(1234567890+i*2, 0),
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}
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bw.rxstream.add(d)
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}
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validate(t, bw.rxstream.averages(), []float64{0.0, 0.5, 0.5})
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}
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func TestManyPerSecond(t *testing.T) {
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bw, err := NewBandwidth([]int{1, 10, 60}, 100*time.Millisecond)
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if err != nil {
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t.Error(err)
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}
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bw.rxstream = newStream([]int{1, 10, 60})
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var i int64 = 0
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for ; i < 10000; i++ {
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d := datum{
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value: 1.0,
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at: time.Unix(1234567890, i*10000000),
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}
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bw.rxstream.add(d)
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}
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validate(t, bw.rxstream.averages(), []float64{100.0, 100.0, 100.0})
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}
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func TestEmpty(t *testing.T) {
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bw, err := NewBandwidth([]int{1, 10, 60}, 100*time.Millisecond)
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if err != nil {
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t.Error(err)
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}
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bw.rxstream = newStream([]int{1, 10, 60})
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validate(t, bw.rxstream.averages(), []float64{})
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go bw.Run()
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bw.rxstream = []int{1, 10, 60}
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validate(t, <-bw.Rx, []float64{})
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}
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func TestEmptySeconds(t *testing.T) {
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@ -116,3 +37,8 @@ func TestEmptySeconds(t *testing.T) {
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t.Error(err)
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}
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}
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func TestA(t *testing.T) {
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bw, _ := NewBandwidth([]int{1, 10, 30}, 1*time.Second)
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log.Printf("%+v", bw)
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}
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