/
writer_test.go
188 lines (153 loc) · 4.21 KB
/
writer_test.go
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package cdb_test
import (
"hash/fnv"
"io/ioutil"
"log"
"math/rand"
"os"
"reflect"
"strconv"
"testing"
"testing/quick"
"time"
"github.com/Pallinder/go-randomdata"
"github.com/colinmarc/cdb"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func fnvHash(data []byte) uint32 {
h := fnv.New32a()
h.Write(data)
return h.Sum32()
}
func testWritesReadable(t *testing.T, writer *cdb.Writer) {
expected := make([][][]byte, 0, 100)
for i := 0; i < cap(expected); i++ {
key := []byte(strconv.Itoa(i))
value := []byte(randomdata.SillyName())
err := writer.Put(key, value)
require.NoError(t, err)
expected = append(expected, [][]byte{key, value})
}
db, err := writer.Freeze()
require.NoError(t, err)
for _, record := range expected {
msg := "while fetching " + string(record[0])
val, err := db.Get(record[0])
require.Nil(t, err)
assert.Equal(t, string(record[1]), string(val), msg)
}
}
func TestWritesReadable(t *testing.T) {
f, err := ioutil.TempFile("", "test-cdb")
require.NoError(t, err)
defer os.Remove(f.Name())
writer, err := cdb.NewWriter(f, nil)
require.NoError(t, err)
require.NotNil(t, writer)
testWritesReadable(t, writer)
}
func TestWritesReadableFnv(t *testing.T) {
f, err := ioutil.TempFile("", "test-cdb")
require.NoError(t, err)
defer os.Remove(f.Name())
writer, err := cdb.NewWriter(f, fnvHash)
require.NoError(t, err)
require.NotNil(t, writer)
testWritesReadable(t, writer)
}
func testWritesRandom(t *testing.T, writer *cdb.Writer) {
random := rand.New(rand.NewSource(time.Now().UnixNano()))
records := make([][][]byte, 0, 1000)
seenKeys := make(map[string]bool)
stringType := reflect.TypeOf("")
// Make sure we don't end up with duplicate keys, since that makes testing
// hard.
for len(records) < cap(records) {
key, _ := quick.Value(stringType, random)
if !seenKeys[key.String()] {
value, _ := quick.Value(stringType, random)
keyBytes := []byte(key.String())
valueBytes := []byte(value.String())
records = append(records, [][]byte{keyBytes, valueBytes})
seenKeys[key.String()] = true
}
}
for _, record := range records {
err := writer.Put(record[0], record[1])
require.NoError(t, err)
}
db, err := writer.Freeze()
require.NoError(t, err)
for _, record := range records {
msg := "while fetching " + string(record[0])
val, err := db.Get(record[0])
require.Nil(t, err)
assert.Equal(t, string(record[1]), string(val), msg)
}
}
func TestWritesRandom(t *testing.T) {
f, err := ioutil.TempFile("", "test-cdb")
require.NoError(t, err)
defer os.Remove(f.Name())
writer, err := cdb.NewWriter(f, nil)
require.NoError(t, err)
require.NotNil(t, writer)
testWritesRandom(t, writer)
}
func TestWritesRandomFnv(t *testing.T) {
f, err := ioutil.TempFile("", "test-cdb")
require.NoError(t, err)
defer os.Remove(f.Name())
writer, err := cdb.NewWriter(f, fnvHash)
require.NoError(t, err)
require.NotNil(t, writer)
testWritesRandom(t, writer)
}
func benchmarkPut(b *testing.B, writer *cdb.Writer) {
random := rand.New(rand.NewSource(time.Now().UnixNano()))
stringType := reflect.TypeOf("")
b.ResetTimer()
for i := 0; i < b.N; i++ {
key, _ := quick.Value(stringType, random)
value, _ := quick.Value(stringType, random)
keyBytes := []byte(key.String())
valueBytes := []byte(value.String())
writer.Put(keyBytes, valueBytes)
}
}
func BenchmarkPut(b *testing.B) {
f, err := ioutil.TempFile("", "test-cdb")
require.NoError(b, err)
defer func() {
f.Close()
os.Remove(f.Name())
}()
writer, err := cdb.NewWriter(f, nil)
require.NoError(b, err)
benchmarkPut(b, writer)
}
func BenchmarkPutFnv(b *testing.B) {
f, err := ioutil.TempFile("", "test-cdb")
require.NoError(b, err)
defer func() {
f.Close()
os.Remove(f.Name())
}()
writer, err := cdb.NewWriter(f, fnvHash)
require.NoError(b, err)
benchmarkPut(b, writer)
}
func ExampleWriter() {
writer, err := cdb.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"))
// It's important to call Close or Freeze when you're finished writing
// records.
writer.Close()
}