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cdb_test.go
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cdb_test.go
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package cdb64
import (
"fmt"
"log"
"math/rand"
"os"
"sync"
"syscall"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var expectedRecords = [][][]byte{
{[]byte("foo"), []byte("bar")},
{[]byte("baz"), []byte("quuuux")},
{[]byte("playwright"), []byte("wow")},
{[]byte("crystal"), []byte("CASTLES")},
{[]byte("CRYSTAL"), []byte("castles")},
{[]byte("snush"), []byte("collision!")}, // 'playwright' collides with 'snush' in cdbhash
{[]byte("a"), []byte("a")},
{[]byte("empty_value"), []byte("")},
{[]byte(""), []byte("empty_key")},
{[]byte("not in the table"), nil},
}
func TestGet(t *testing.T) {
db, err := Open("./test/test.cdb")
require.NoError(t, err)
require.NotNil(t, db)
records := append(append(expectedRecords, expectedRecords...), expectedRecords...)
shuffle(records)
for _, record := range records {
msg := "while fetching " + string(record[0])
value, err := db.Get(record[0])
require.NoError(t, err, msg)
println("key:", string(record[0]), "value:", string(value), "nil:", value == nil)
assert.Equal(t, string(record[1]), string(value), msg)
}
}
func TestGetParallel(t *testing.T) {
db, err := Open("./test/test.cdb")
require.NoError(t, err)
require.NotNil(t, db)
records := append(append(expectedRecords, expectedRecords...), expectedRecords...)
shuffle(records)
for _, record := range records {
msg := "while fetching " + string(record[0])
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func(t *testing.T) {
defer wg.Done()
value, err := db.Get(record[0])
require.NoError(t, err, msg)
println("key:", string(record[0]), "value:", string(value), "nil:", value == nil)
assert.Equal(t, string(record[1]), string(value), msg)
}(t)
}
wg.Wait()
}
}
func TestClosesFile(t *testing.T) {
f, err := os.Open("./test/test.cdb")
require.NoError(t, err)
db, err := New(f, nil)
require.NoError(t, err)
require.NotNil(t, db)
err = db.Close()
require.NoError(t, err)
err = f.Close()
assert.Equal(t, syscall.EINVAL, err)
}
func BenchmarkGet(b *testing.B) {
db, _ := Open("./test/test.cdb")
b.ResetTimer()
rand.Seed(time.Now().UnixNano())
for i := 0; i < b.N; i++ {
record := expectedRecords[rand.Intn(len(expectedRecords))]
db.Get(record[0])
}
}
func Example() {
writer, err := Create("/tmp/example.cdb")
if err != nil {
log.Fatal(err)
}
// Write some key/value pairs to the database.
writer.Put([]byte("Alice"), []byte("Practice"))
writer.Put([]byte("Bob"), []byte("Hope"))
writer.Put([]byte("Charlie"), []byte("Horse"))
// Freeze the database, and open it for reads.
db, err := writer.Freeze()
if err != nil {
log.Fatal(err)
}
// Fetch a value.
v, err := db.Get([]byte("Alice"))
if err != nil {
log.Fatal(err)
}
fmt.Println(string(v))
// Output: Practice
}
func ExampleCDB() {
db, err := Open("./test/test.cdb")
if err != nil {
log.Fatal(err)
}
// Fetch a value.
v, err := db.Get([]byte("foo"))
if err != nil {
log.Fatal(err)
}
fmt.Println(string(v))
// Output: bar
}
func shuffle(a [][][]byte) {
rand.Seed(time.Now().UnixNano())
for i := len(a) - 1; i > 0; i-- {
j := rand.Intn(i)
a[i], a[j] = a[j], a[i]
}
}