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throttler_test.go
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package throttler
import (
"fmt"
"math/rand"
"reflect"
"strconv"
"testing"
"time"
)
func TestThrottle(t *testing.T) {
var tests = []struct {
Desc string
Jobs []string
MaxWorkers int
TotalJobs int
}{
{
"Standard implementation",
[]string{"job01", "job02", "job03", "job04", "job05", "job06", "job07", "job08", "job09", "job10",
"job11", "job12", "job13", "job14", "job15", "job16", "job17", "job18", "job19", "job20",
"job21", "job22", "job23", "job24", "job25", "job26", "job27", "job28", "job29", "job30",
"job31", "job32", "job33", "job34", "job35", "job36", "job37", "job38", "job39", "job40",
"job41", "job42", "job43", "job44", "job45", "job46", "job47", "job48", "job49", "job50"},
5,
-1,
}, {
"Incorrectly has 0 as TotalWorkers",
[]string{"job01", "job02", "job03", "job04", "job05", "job06", "job07", "job08", "job09", "job10",
"job11", "job12", "job13", "job14", "job15", "job16", "job17", "job18", "job19", "job20",
"job21", "job22", "job23", "job24", "job25", "job26", "job27", "job28", "job29", "job30",
"job31", "job32", "job33", "job34", "job35", "job36", "job37", "job38", "job39", "job40",
"job41", "job42", "job43", "job44", "job45", "job46", "job47", "job48", "job49", "job50"},
5,
0,
}, {
"More workers than jobs",
[]string{"job01", "job02", "job03", "job04", "job05", "job06", "job07", "job08", "job09", "job10",
"job11", "job12", "job13", "job14", "job15", "job16", "job17", "job18", "job19", "job20",
"job21", "job22", "job23", "job24", "job25", "job26", "job27", "job28", "job29", "job30",
"job31", "job32", "job33", "job34", "job35", "job36", "job37", "job38", "job39", "job40",
"job41", "job42", "job43", "job44", "job45", "job46", "job47", "job48", "job49", "job50"},
50000,
-1,
},
}
for _, test := range tests {
totalJobs := len(test.Jobs)
if test.TotalJobs != -1 {
totalJobs = test.TotalJobs
}
th := New(test.MaxWorkers, totalJobs)
for _, job := range test.Jobs {
go func(job string, th *Throttler) {
defer th.Done(nil)
time.Sleep(time.Duration(rand.Intn(5)) * time.Millisecond)
}(job, th)
th.Throttle()
}
if th.Err() != nil {
fmt.Println("err:", th.Err())
}
}
}
func TestThrottleWithErrors(t *testing.T) {
var tests = []struct {
Desc string
Jobs []string
MaxWorkers int
TotalJobs int
}{
{
"Standard implementation",
[]string{"job01", "job02", "job03", "job04", "job05", "job06", "job07", "job08", "job09", "job10",
"job11", "job12", "job13", "job14", "job15", "job16", "job17", "job18", "job19", "job20",
"job21", "job22", "job23", "job24", "job25", "job26", "job27", "job28", "job29", "job30",
"job31", "job32", "job33", "job34", "job35", "job36", "job37", "job38", "job39", "job40",
"job41", "job42", "job43", "job44", "job45", "job46", "job47", "job48", "job49", "job50"},
5,
-1,
}, {
"Standard implementation",
[]string{"job01", "job02"},
5,
-1,
},
}
for _, test := range tests {
totalJobs := len(test.Jobs)
if test.TotalJobs != -1 {
totalJobs = test.TotalJobs
}
th := New(test.MaxWorkers, totalJobs)
for _, job := range test.Jobs {
go func(job string, th *Throttler) {
jobNum, _ := strconv.ParseInt(job[len(job)-2:], 10, 8)
var err error
if jobNum%2 != 0 {
err = fmt.Errorf("Error on %s", job)
}
defer th.Done(err)
time.Sleep(time.Duration(rand.Intn(5)) * time.Millisecond)
}(job, th)
th.Throttle()
}
if len(th.Errs()) != totalJobs/2 {
t.Fatal("The wrong number of errors were returned")
}
if th.Err() != nil {
fmt.Println("err:", th.Err())
}
}
}
func TestThrottlePanic(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Fatal("Test failed to panic")
}
}()
New(0, 100)
}
func TestBatchedThrottler(t *testing.T) {
var tests = []struct {
Desc string
ToBeBatched []string
MaxWorkers int
BatchSize int
ExpectedBatchedSlices [][]string
}{
{
"Standard implementation",
[]string{"item01", "item02", "item03", "item04", "item05", "item06", "item07", "item08", "item09", "item10",
"item11", "item12", "item13", "item14", "item15", "item16", "item17", "item18", "item19", "item20",
"item21", "item22", "item23", "item24", "item25", "item26", "item27", "item28", "item29", "item30",
"item31", "item32", "item33", "item34", "item35", "item36", "item37", "item38", "item39", "item40",
"item41", "item42", "item43", "item44", "item45", "item46", "item47", "item48", "item49",
},
10,
2,
[][]string{
{"item01", "item02"},
{"item03", "item04"},
{"item05", "item06"},
{"item07", "item08"},
{"item09", "item10"},
{"item11", "item12"},
{"item13", "item14"},
{"item15", "item16"},
{"item17", "item18"},
{"item19", "item20"},
{"item21", "item22"},
{"item23", "item24"},
{"item25", "item26"},
{"item27", "item28"},
{"item29", "item30"},
{"item31", "item32"},
{"item33", "item34"},
{"item35", "item36"},
{"item37", "item38"},
{"item39", "item40"},
{"item41", "item42"},
{"item43", "item44"},
{"item45", "item46"},
{"item47", "item48"},
{"item49"},
},
},
}
for _, test := range tests {
th := NewBatchedThrottler(test.MaxWorkers, len(test.ToBeBatched), test.BatchSize)
for i := 0; i < th.TotalJobs(); i++ {
go func(tbbSlice []string, expectedSlice []string) {
var err error
if !reflect.DeepEqual(tbbSlice, expectedSlice) {
err = fmt.Errorf("wanted: %#v | got: %#v", expectedSlice, tbbSlice)
}
th.Done(err)
}(test.ToBeBatched[th.BatchStartIndex():th.BatchEndIndex()], test.ExpectedBatchedSlices[i])
if errCount := th.Throttle(); errCount > 0 {
break
}
}
if th.Err() != nil {
t.Fatal(th.Err())
}
}
}
func TestSetMaxWorkers(t *testing.T) {
var tests = []struct {
Desc string
Jobs []string
InitialMaxWorkers int
EndMaxWorkers int
TotalJobs int
}{
{
"Standard implementation",
[]string{"job01", "job02", "job03", "job04", "job05", "job06", "job07", "job08", "job09", "job10",
"job11", "job12", "job13", "job14", "job15", "job16", "job17", "job18", "job19", "job20",
"job21", "job22", "job23", "job24", "job25", "job26", "job27", "job28", "job29", "job30",
"job31", "job32", "job33", "job34", "job35", "job36", "job37", "job38", "job39", "job40",
"job41", "job42", "job43", "job44", "job45", "job46", "job47", "job48", "job49", "job50"},
1,
5,
-1,
}, {
"Incorrectly has 0 as TotalWorkers",
[]string{"job01", "job02", "job03", "job04", "job05", "job06", "job07", "job08", "job09", "job10",
"job11", "job12", "job13", "job14", "job15", "job16", "job17", "job18", "job19", "job20",
"job21", "job22", "job23", "job24", "job25", "job26", "job27", "job28", "job29", "job30",
"job31", "job32", "job33", "job34", "job35", "job36", "job37", "job38", "job39", "job40",
"job41", "job42", "job43", "job44", "job45", "job46", "job47", "job48", "job49", "job50"},
1,
5,
0,
}, {
"More workers than jobs",
[]string{"job01", "job02", "job03", "job04", "job05", "job06", "job07", "job08", "job09", "job10",
"job11", "job12", "job13", "job14", "job15", "job16", "job17", "job18", "job19", "job20",
"job21", "job22", "job23", "job24", "job25", "job26", "job27", "job28", "job29", "job30",
"job31", "job32", "job33", "job34", "job35", "job36", "job37", "job38", "job39", "job40",
"job41", "job42", "job43", "job44", "job45", "job46", "job47", "job48", "job49", "job50"},
1,
50000,
-1,
},
}
for _, test := range tests {
totalJobs := len(test.Jobs)
if test.TotalJobs != -1 {
totalJobs = test.TotalJobs
}
th := New(test.InitialMaxWorkers, totalJobs)
for i, job := range test.Jobs {
if i == test.InitialMaxWorkers+1 {
th.SetMaxWorkers(test.EndMaxWorkers)
}
go func(job string, th *Throttler) {
defer th.Done(nil)
time.Sleep(time.Duration(rand.Intn(5)) * time.Millisecond)
}(job, th)
th.Throttle()
}
if th.Err() != nil {
fmt.Println("err:", th.Err())
}
}
}
func TestSetMaxWorkersPanic(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Fatal("Test failed to panic")
}
}()
th := New(1, 10)
th.SetMaxWorkers(-1)
}