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bitcask_test.go
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bitcask_test.go
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package bitcask
import (
"fmt"
"os"
"path"
"reflect"
"strconv"
"testing"
)
var testBitcaskPath = path.Join("testing_dir")
func TestOpen(t *testing.T) {
t.Run("open new bitcask with read and write permission", func(t *testing.T) {
Open(testBitcaskPath, ReadWrite)
if _, err := os.Stat(testBitcaskPath); os.IsNotExist(err) {
t.Errorf("Expected to find directory: %q", testBitcaskPath)
}
os.RemoveAll(testBitcaskPath)
})
t.Run("open new bitcask with sync_on_put option", func(t *testing.T) {
Open(testBitcaskPath, ReadWrite, SyncOnPut)
if _, err := os.Stat(testBitcaskPath); os.IsNotExist(err) {
t.Errorf("Expected to find directory: %q", testBitcaskPath)
}
os.RemoveAll(testBitcaskPath)
})
t.Run("open new bitcask with default options", func(t *testing.T) {
_, err := Open(testBitcaskPath)
assertError(t, err, "open testing_dir: no such file or directory")
os.RemoveAll(testBitcaskPath)
})
t.Run("open existing bitcask with write permission", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite)
b1.Put("key12", "value12345")
b1.Close()
b2, _ := Open(testBitcaskPath, ReadWrite)
want := "value12345"
got, _ := b2.Get("key12")
b2.Close()
assertString(t, got, want)
os.RemoveAll(testBitcaskPath)
})
t.Run("two readers in the same bitcask at the same time", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite)
b1.Put("key2", "value2")
b1.Put("key3", "value3")
b1.Close()
b2, _ := Open(testBitcaskPath)
b3, _ := Open(testBitcaskPath)
want := "value2"
got, _ := b2.Get("key2")
assertString(t, got, want)
b2.Close()
got, _ = b3.Get("key2")
assertString(t, got, want)
b3.Close()
os.RemoveAll(testBitcaskPath)
})
t.Run("open existing bitcask with hint files in it", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite)
for i := 0; i < 1000; i++ {
key := fmt.Sprintf("key%d", i+1)
value := fmt.Sprintf("value%d", i+1)
b1.Put(key, value)
}
b1.Merge()
b1.Close()
b2, _ := Open(testBitcaskPath)
got, _ := b2.Get("key50")
want := "value50"
assertString(t, got, want)
os.RemoveAll(testBitcaskPath)
})
t.Run("open bitcask with writer exists in it", func(t *testing.T) {
Open(testBitcaskPath, ReadWrite)
_, err := Open(testBitcaskPath)
assertError(t, err, "access denied: datastore is locked")
os.RemoveAll(testBitcaskPath)
})
t.Run("open bitcask failed", func(t *testing.T) {
// create a directory that cannot be openned since it has no execute permission
os.MkdirAll(path.Join("no open dir"), 000)
want := "open no open dir: permission denied"
_, err := Open("no open dir")
assertError(t, err, want)
os.RemoveAll("no open dir")
})
}
func TestGet(t *testing.T) {
t.Run("get existing value", func(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite, SyncOnPut)
b.Put("key12", "value12345")
got, _ := b.Get("key12")
want := "value12345"
assertString(t, got, want)
b.Close()
os.RemoveAll(testBitcaskPath)
})
t.Run("get not existing value", func(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite)
want := "unknown key: key does not exist"
_, err := b.Get("unknown key")
assertError(t, err, want)
os.RemoveAll(testBitcaskPath)
})
}
func TestPut(t *testing.T) {
t.Run("put values with writer permission", func(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite)
b.Put("key12", "value12345")
want := "value12345"
got, _ := b.Get("key12")
assertString(t, got, want)
os.RemoveAll(testBitcaskPath)
})
t.Run("put with no write permission", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite)
b1.Close()
b2, _ := Open(testBitcaskPath)
err := b2.Put("key12", "value12345")
assertError(t, err, "Put: require write permission")
os.RemoveAll(testBitcaskPath)
})
}
func TestDelete(t *testing.T) {
t.Run("delete existing key", func(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite, SyncOnPut)
b.Put("key12", "value12345")
b.Delete("key12")
_, err := b.Get("key12")
assertError(t, err, "key12: key does not exist")
os.RemoveAll(testBitcaskPath)
})
t.Run("delete not existing key", func(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite, SyncOnDemand)
err := b.Delete("key12")
assertError(t, err, "key12: key does not exist")
os.RemoveAll(testBitcaskPath)
})
t.Run("delete with no write permission", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite)
b1.Close()
b2, _ := Open(testBitcaskPath)
err := b2.Delete("key12")
assertError(t, err, "Delete: require write permission")
os.RemoveAll(testBitcaskPath)
})
t.Run("check if loaded delete is detected", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite, SyncOnPut)
b1.Put("key12", "value12345")
b1.Delete("key12")
b1.Close()
b2, _ := Open(testBitcaskPath, ReadWrite, SyncOnPut)
_, err := b2.Get("key12")
want := "key12: key does not exist"
assertError(t, err, want)
os.RemoveAll(testBitcaskPath)
})
}
func TestListkeys(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite, SyncOnDemand)
key := "key12"
value := "value12345"
b.Put(key, value)
want := []string{"key12"}
got := b.ListKeys()
if !reflect.DeepEqual(got, want) {
t.Errorf("got:\n%v\nwant:\n%v", got, want)
}
os.RemoveAll(testBitcaskPath)
}
func TestFold(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite, SyncOnDemand)
for i := 0; i < 10; i++ {
b.Put(fmt.Sprint(i+1), fmt.Sprint(i+1))
}
want := 110
got := b.Fold(func(s1, s2 string, a any) any {
acc, _ := a.(int)
k, _ := strconv.Atoi(s1)
v, _ := strconv.Atoi(s2)
return acc + k + v
}, 0)
if got != want {
t.Errorf("got:%d, want:%d", got, want)
}
os.RemoveAll(testBitcaskPath)
}
func TestMerge(t *testing.T) {
t.Run("merge with write permission", func(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite)
for i := 0; i < 10000; i++ {
key := fmt.Sprintf("key%d", i+1)
value := fmt.Sprintf("value%d", i+1)
b.Put(key, value)
}
b.Merge()
want := "value100"
got, _ := b.Get("key100")
b.Close()
assertString(t, got, want)
os.RemoveAll(testBitcaskPath)
})
t.Run("with no write permission", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite)
b1.Close()
b2, _ := Open(testBitcaskPath)
err := b2.Merge()
want := "Merge: require write permission"
assertError(t, err, want)
os.RemoveAll(testBitcaskPath)
})
}
func TestSync(t *testing.T) {
t.Run("put with sync on demand option is set", func(t *testing.T) {
b, _ := Open(testBitcaskPath, ReadWrite)
b.Put("key12", "value12345")
b.Sync()
want := "value12345"
got, _ := b.Get("key12")
assertString(t, got, want)
os.RemoveAll(testBitcaskPath)
})
t.Run("sync with no write permission", func(t *testing.T) {
b1, _ := Open(testBitcaskPath, ReadWrite)
b1.Close()
b2, _ := Open(testBitcaskPath)
err := b2.Sync()
assertError(t, err, "Sync: require write permission")
os.RemoveAll(testBitcaskPath)
})
}
func assertError(t testing.TB, err error, want string) {
t.Helper()
if err == nil {
t.Fatalf("Expected Error %q", want)
}
assertString(t, err.Error(), want)
}
func assertString(t testing.TB, got, want string) {
t.Helper()
if got != want {
t.Errorf("got:\n%q\nwant:\n%q", got, want)
}
}