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sonyflake_test.go
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sonyflake_test.go
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package sonyflake
import (
"fmt"
"runtime"
"testing"
"time"
)
var sf *Sonyflake
var startTime int64
var machineID uint64
func init() {
var st Settings
st.StartTime = time.Now()
sf = NewSonyflake(st)
if sf == nil {
panic("sonyflake not created")
}
startTime = toSonyflakeTime(st.StartTime)
ip, _ := lower16BitPrivateIP()
machineID = uint64(ip)
}
func nextID(t *testing.T) uint64 {
id, err := sf.NextID()
if err != nil {
t.Fatal("id not generated")
}
return id
}
func TestSonyflakeOnce(t *testing.T) {
sleepTime := time.Duration(50 * sonyflakeTimeUnit)
time.Sleep(sleepTime)
id := nextID(t)
actualTime := ElapsedTime(id)
if actualTime < sleepTime || actualTime > sleepTime+sonyflakeTimeUnit {
t.Errorf("unexpected time: %d", actualTime)
}
actualSequence := SequenceNumber(id)
if actualSequence != 0 {
t.Errorf("unexpected sequence: %d", actualSequence)
}
actualMachineID := MachineID(id)
if actualMachineID != machineID {
t.Errorf("unexpected machine id: %d", actualMachineID)
}
fmt.Println("sonyflake id:", id)
fmt.Println("decompose:", Decompose(id))
}
func currentTime() int64 {
return toSonyflakeTime(time.Now())
}
func TestSonyflakeFor10Sec(t *testing.T) {
var numID uint32
var lastID uint64
var maxSequence uint64
initial := currentTime()
current := initial
for current-initial < 1000 {
id := nextID(t)
parts := Decompose(id)
numID++
if id == lastID {
t.Fatal("duplicated id")
}
if id < lastID {
t.Fatal("must increase with time")
}
lastID = id
current = currentTime()
actualMSB := parts["msb"]
if actualMSB != 0 {
t.Errorf("unexpected msb: %d", actualMSB)
}
actualTime := int64(parts["time"])
overtime := startTime + actualTime - current
if overtime > 0 {
t.Errorf("unexpected overtime: %d", overtime)
}
actualSequence := parts["sequence"]
if maxSequence < actualSequence {
maxSequence = actualSequence
}
actualMachineID := parts["machine-id"]
if actualMachineID != machineID {
t.Errorf("unexpected machine id: %d", actualMachineID)
}
}
if maxSequence != 1<<BitLenSequence-1 {
t.Errorf("unexpected max sequence: %d", maxSequence)
}
fmt.Println("max sequence:", maxSequence)
fmt.Println("number of id:", numID)
}
func TestSonyflakeInParallel(t *testing.T) {
numCPU := runtime.NumCPU()
runtime.GOMAXPROCS(numCPU)
fmt.Println("number of cpu:", numCPU)
consumer := make(chan uint64)
const numID = 10000
generate := func() {
for i := 0; i < numID; i++ {
consumer <- nextID(t)
}
}
const numGenerator = 10
for i := 0; i < numGenerator; i++ {
go generate()
}
set := make(map[uint64]struct{})
for i := 0; i < numID*numGenerator; i++ {
id := <-consumer
if _, ok := set[id]; ok {
t.Fatal("duplicated id")
}
set[id] = struct{}{}
}
fmt.Println("number of id:", len(set))
}
func TestNilSonyflake(t *testing.T) {
var startInFuture Settings
startInFuture.StartTime = time.Now().Add(time.Duration(1) * time.Minute)
if NewSonyflake(startInFuture) != nil {
t.Errorf("sonyflake starting in the future")
}
var noMachineID Settings
noMachineID.MachineID = func() (uint16, error) {
return 0, fmt.Errorf("no machine id")
}
if NewSonyflake(noMachineID) != nil {
t.Errorf("sonyflake with no machine id")
}
var invalidMachineID Settings
invalidMachineID.CheckMachineID = func(uint16) bool {
return false
}
if NewSonyflake(invalidMachineID) != nil {
t.Errorf("sonyflake with invalid machine id")
}
}
func pseudoSleep(period time.Duration) {
sf.startTime -= int64(period) / sonyflakeTimeUnit
}
func TestNextIDError(t *testing.T) {
year := time.Duration(365*24) * time.Hour
pseudoSleep(time.Duration(174) * year)
nextID(t)
pseudoSleep(time.Duration(1) * year)
_, err := sf.NextID()
if err == nil {
t.Errorf("time is not over")
}
}
func TestSonyflakeTimeUnit(t *testing.T) {
if time.Duration(sonyflakeTimeUnit) != 10*time.Millisecond {
t.Errorf("unexpected time unit")
}
}