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package api
import (
"fmt"
"math/rand"
"testing"
"github.com/stretchr/testify/assert"
)
func BenchmarkPrevEventIDs(b *testing.B) {
for _, x := range []int64{1, 10, 100, 500, 1000, 2000} {
benchPrevEventIDs(b, int(x))
}
}
func benchPrevEventIDs(b *testing.B, count int) {
bwExtrems := generateBackwardsExtremities(b, count)
backfiller := PerformBackfillRequest{
BackwardsExtremities: bwExtrems,
}
b.Run(fmt.Sprintf("Original%d", count), func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
prevIDs := backfiller.PrevEventIDs()
_ = prevIDs
}
})
}
type testLike interface {
Helper()
}
const randomIDCharsCount = 10
func generateBackwardsExtremities(t testLike, count int) map[string][]string {
t.Helper()
result := make(map[string][]string, count)
for i := 0; i < count; i++ {
eventID := randomEventId(int64(i))
result[eventID] = []string{
randomEventId(int64(i + 1)),
randomEventId(int64(i + 2)),
randomEventId(int64(i + 3)),
}
}
return result
}
const alphanumerics = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
// randomEventId generates a pseudo-random string of length n.
func randomEventId(src int64) string {
randSrc := rand.NewSource(src)
b := make([]byte, randomIDCharsCount)
for i := range b {
b[i] = alphanumerics[randSrc.Int63()%int64(len(alphanumerics))]
}
return string(b)
}
func TestPrevEventIDs(t *testing.T) {
// generate 10 backwards extremities
bwExtrems := generateBackwardsExtremities(t, 10)
backfiller := PerformBackfillRequest{
BackwardsExtremities: bwExtrems,
}
prevIDs := backfiller.PrevEventIDs()
// Given how "generateBackwardsExtremities" works, this
// generates 12 unique event IDs
assert.Equal(t, 12, len(prevIDs))
// generate 200 backwards extremities
backfiller.BackwardsExtremities = generateBackwardsExtremities(t, 200)
prevIDs = backfiller.PrevEventIDs()
// PrevEventIDs returns at max 100 event IDs
assert.Equal(t, 100, len(prevIDs))
}
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