Golang KeyValue.Set方法代碼示例

func TestSorted(t *testing.T, kv sorted.KeyValue) {
	defer test.TLog(t)()
	if !isEmpty(t, kv) {
		t.Fatal("kv for test is expected to be initially empty")
	}
	set := func(k, v string) {
		if err := kv.Set(k, v); err != nil {
			t.Fatalf("Error setting %q to %q: %v", k, v, err)
		}
	}
	set("foo", "bar")
	if isEmpty(t, kv) {
		t.Fatalf("iterator reports the kv is empty after adding foo=bar; iterator must be broken")
	}
	if v, err := kv.Get("foo"); err != nil || v != "bar" {
		t.Errorf("get(foo) = %q, %v; want bar", v, err)
	}
	if v, err := kv.Get("NOT_EXIST"); err != sorted.ErrNotFound {
		t.Errorf("get(NOT_EXIST) = %q, %v; want error sorted.ErrNotFound", v, err)
	}
	for i := 0; i < 2; i++ {
		if err := kv.Delete("foo"); err != nil {
			t.Errorf("Delete(foo) (on loop %d/2) returned error %v", i+1, err)
		}
	}
	set("a", "av")
	set("b", "bv")
	set("c", "cv")
	testEnumerate(t, kv, "", "", "av", "bv", "cv")
	testEnumerate(t, kv, "a", "", "av", "bv", "cv")
	testEnumerate(t, kv, "b", "", "bv", "cv")
	testEnumerate(t, kv, "a", "c", "av", "bv")
	testEnumerate(t, kv, "a", "b", "av")
	testEnumerate(t, kv, "a", "a")
	testEnumerate(t, kv, "d", "")
	testEnumerate(t, kv, "d", "e")

	// Verify that < comparison works identically for all DBs (because it is affected by collation rules)
	// http://postgresql.1045698.n5.nabble.com/String-comparison-and-the-SQL-standard-td5740721.html
	set("foo|abc", "foo|abcv")
	testEnumerate(t, kv, "foo|", "", "foo|abcv")
	testEnumerate(t, kv, "foo|", "foo}", "foo|abcv")

	// Verify that the value isn't being used instead of the key in the range comparison.
	set("y", "x:foo")
	testEnumerate(t, kv, "x:", "x~")

	testInsertLarge(t, kv)
	testInsertTooLarge(t, kv)

	// TODO: test batch commits

	// Deleting a non-existent item in a batch should not be an error
	testDeleteNotFoundBatch(t, kv)
	testDeletePartialNotFoundBatch(t, kv)
}

func testInsertTooLarge(t *testing.T, kv sorted.KeyValue) {
	largeKey := make([]byte, sorted.MaxKeySize+1)
	largeValue := make([]byte, sorted.MaxValueSize+1)
	if err := kv.Set(string(largeKey), "whatever"); err == nil || err != sorted.ErrKeyTooLarge {
		t.Fatalf("Insertion of too large a key should have failed, but err was %v", err)
	}
	if err := kv.Set("whatever", string(largeValue)); err == nil || err != sorted.ErrValueTooLarge {
		t.Fatalf("Insertion of too large a value should have failed, but err was %v", err)
	}
}

func testDeletePartialNotFoundBatch(t *testing.T, kv sorted.KeyValue) {
	if err := kv.Set(butIExistKey, "whatever"); err != nil {
		t.Fatal(err)
	}
	b := kv.BeginBatch()
	b.Delete(notExistKey)
	b.Delete(butIExistKey)
	if err := kv.CommitBatch(b); err != nil {
		t.Fatalf("Batch deletion with one non existing key returned an error: %v", err)
	}
	if val, err := kv.Get(butIExistKey); err != sorted.ErrNotFound || val != "" {
		t.Fatalf("Key %q should have been batch deleted", butIExistKey)
	}
}

func TestSorted(t *testing.T, kv sorted.KeyValue) {
	defer test.TLog(t)()
	if !isEmpty(t, kv) {
		t.Fatal("kv for test is expected to be initially empty")
	}
	set := func(k, v string) {
		if err := kv.Set(k, v); err != nil {
			t.Fatalf("Error setting %q to %q: %v", k, v, err)
		}
	}
	set("foo", "bar")
	if isEmpty(t, kv) {
		t.Fatalf("iterator reports the kv is empty after adding foo=bar; iterator must be broken")
	}
	if v, err := kv.Get("foo"); err != nil || v != "bar" {
		t.Errorf("get(foo) = %q, %v; want bar", v, err)
	}
	if v, err := kv.Get("NOT_EXIST"); err != sorted.ErrNotFound {
		t.Errorf("get(NOT_EXIST) = %q, %v; want error sorted.ErrNotFound", v, err)
	}
	for i := 0; i < 2; i++ {
		if err := kv.Delete("foo"); err != nil {
			t.Errorf("Delete(foo) (on loop %d/2) returned error %v", i+1, err)
		}
	}
	set("a", "av")
	set("b", "bv")
	set("c", "cv")
	testEnumerate(t, kv, "", "", "av", "bv", "cv")
	testEnumerate(t, kv, "a", "", "av", "bv", "cv")
	testEnumerate(t, kv, "b", "", "bv", "cv")
	testEnumerate(t, kv, "a", "c", "av", "bv")
	testEnumerate(t, kv, "a", "b", "av")
	testEnumerate(t, kv, "a", "a")
	testEnumerate(t, kv, "d", "")
	testEnumerate(t, kv, "d", "e")

	// Verify that the value isn't being used instead of the key in the range comparison.
	set("y", "x:foo")
	testEnumerate(t, kv, "x:", "x~")

	// TODO: test batch commits
}

func testInsertTooLarge(t *testing.T, kv sorted.KeyValue) {
	largeKey := make([]byte, sorted.MaxKeySize+1)
	largeValue := make([]byte, sorted.MaxValueSize+1)
	err := kv.Set(string(largeKey), "whatever")
	if err != nil {
		t.Fatalf("Insertion of too large a key should have skipped with some logging, but err was %v", err)
	}
	_, err = kv.Get(string(largeKey))
	if err == nil {
		t.Fatal("large key should not have been inserted")
	}
	err = kv.Set("testInsertTooLarge", string(largeValue))
	if err != nil {
		t.Fatalf("Insertion of too large a value should have skipped with some logging, but err was %v", err)
	}
	_, err = kv.Get("testInsertTooLarge")
	if err == nil {
		t.Fatal("large value should not have been inserted")
	}
}

func testInsertLarge(t *testing.T, kv sorted.KeyValue) {
	largeKey := make([]byte, sorted.MaxKeySize-1)
	// setting all the bytes because postgres whines about an invalid byte sequence
	// otherwise
	for k, _ := range largeKey {
		largeKey[k] = 'A'
	}
	largeKey[sorted.MaxKeySize-2] = 'B'
	largeValue := make([]byte, sorted.MaxValueSize-1)
	for k, _ := range largeValue {
		largeValue[k] = 'A'
	}
	largeValue[sorted.MaxValueSize-2] = 'B'

	// insert with large key
	if err := kv.Set(string(largeKey), "whatever"); err != nil {
		t.Fatalf("Insertion of large key failed: %v", err)
	}

	// and verify we can get it back, i.e. that the key hasn't been truncated.
	it := kv.Find(string(largeKey), "")
	if !it.Next() || it.Key() != string(largeKey) || it.Value() != "whatever" {
		it.Close()
		t.Fatalf("Find(largeKey) = %q, %q; want %q, %q", it.Key(), it.Value(), largeKey, "whatever")
	}
	it.Close()

	// insert with large value
	if err := kv.Set("whatever", string(largeValue)); err != nil {
		t.Fatalf("Insertion of large value failed: %v", err)
	}
	// and verify we can get it back, i.e. that the value hasn't been truncated.
	if v, err := kv.Get("whatever"); err != nil || v != string(largeValue) {
		t.Fatalf("get(\"whatever\") = %q, %v; want %q", v, err, largeValue)
	}

	// insert with large key and large value
	if err := kv.Set(string(largeKey), string(largeValue)); err != nil {
		t.Fatalf("Insertion of large key and value failed: %v", err)
	}
	// and verify we can get them back
	it = kv.Find(string(largeKey), "")
	defer it.Close()
	if !it.Next() || it.Key() != string(largeKey) || it.Value() != string(largeValue) {
		t.Fatalf("Find(largeKey) = %q, %q; want %q, %q", it.Key(), it.Value(), largeKey, largeValue)
	}
}