init repo

.gitignore

@@ -0,0 +1 @@
+.idea

README.md

@@ -0,0 +1,3 @@
+# Go MMKV
+
+initial generated by https://github.com/tencent/mmkv

callback.go

@@ -0,0 +1,119 @@
+/*
+ * Tencent is pleased to support the open source community by making
+ * MMKV available.
+ *
+ * Copyright (C) 2020 THL A29 Limited, a Tencent company.
+ * All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License"); you may not use
+ * this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *       https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// MMKV is a cross-platform key-value storage framework developed by WeChat.
+package mmkv
+
+/*
+#include "golang-bridge.h"
+#include <stdlib.h>
+*/
+import "C"
+
+// the callback type of Logger
+type LogHandler func(level int, file string, line int, function string, message string)
+
+var gLogHandler LogHandler
+
+// register a log callback
+func RegisterLogHandler(logHandler LogHandler) {
+	gLogHandler = logHandler
+
+	C.setWantsLogRedirect(C.bool(true))
+}
+
+// unregister a log callback
+func UnRegisterLogHandler() {
+	gLogHandler = nil
+
+	C.setWantsLogRedirect(C.bool(false))
+}
+
+//export myLogHandler
+func myLogHandler(level int, file string, line int, function string, message string) {
+	if gLogHandler != nil {
+		gLogHandler(level, file, line, function, message)
+	}
+}
+
+const (
+	OnErrorDiscard = iota // When there's an error, MMKV will discard everything by default.
+	OnErrorRecover        // When there's an error, MMKV will try to recover as much data as possible.
+)
+
+const (
+	MMKVCRCCheckFail = iota
+	MMKVFileLength
+)
+
+// the callback type of error handler
+// error is either MMKVCRCCheckFail or MMKVFileLength
+// return OnErrorDiscard (default) or OnErrorRecover
+type ErrorHandler func(mmapID string, error int) int
+
+var gErrorHandler ErrorHandler
+
+// register a error callback
+func RegisterErrorHandler(errorHandler ErrorHandler) {
+	gErrorHandler = errorHandler
+
+	C.setWantsErrorHandle(C.bool(true))
+}
+
+// unregister a error callback
+func UnRegisterErrorHandler() {
+	gErrorHandler = nil
+
+	C.setWantsErrorHandle(C.bool(false))
+}
+
+//export myErrorHandler
+func myErrorHandler(mmapID string, error int) int {
+	if gErrorHandler != nil {
+		return gErrorHandler(mmapID, error)
+	}
+	return OnErrorDiscard
+}
+
+// the type of content change handler
+type ContentChangeHandler func(mmapID string)
+
+var gContentChangeHandler ContentChangeHandler
+
+// register a content change callback
+func RegisterContentChangeHandler(contentChangeHandler ContentChangeHandler) {
+	gContentChangeHandler = contentChangeHandler
+
+	C.setWantsContentChangeHandle(C.bool(true))
+}
+
+// unregister a content change callback
+func UnRegisterContentChangeHandler() {
+	gContentChangeHandler = nil
+
+	C.setWantsContentChangeHandle(C.bool(false))
+}
+
+//export myContentChangeHandler
+func myContentChangeHandler(mmapID string) {
+	if gContentChangeHandler != nil {
+		gContentChangeHandler(mmapID)
+	}
+}

go.mod

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+module unlock-music.dev/mmkv
+
+go 1.15

golang-bridge.cpp

@@ -0,0 +1,542 @@
+/*
+ * Tencent is pleased to support the open source community by making
+ * MMKV available.
+ *
+ * Copyright (C) 2020 THL A29 Limited, a Tencent company.
+ * All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License"); you may not use
+ * this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *       https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CGO
+
+#    include "MMKVPredef.h"
+
+#    include "MMKV.h"
+#    include "golang-bridge.h"
+#    include <stdint.h>
+#    include <string>
+#    include <cstring>
+
+using namespace mmkv;
+using namespace std;
+
+#    define MMKV_EXPORT extern "C" __attribute__((visibility("default"))) __attribute__((used))
+
+MMKV_EXPORT void mmkvInitialize(GoStringWrap rootDir, int32_t logLevel) {
+    if (!rootDir.ptr) {
+        return;
+    }
+    MMKV::initializeMMKV(string(rootDir.ptr, rootDir.length), (MMKVLogLevel) logLevel);
+}
+
+MMKV_EXPORT void onExit() {
+    MMKV::onExit();
+}
+
+MMKV_EXPORT void *getMMKVWithID(GoStringWrap mmapID, int32_t mode, GoStringWrap cryptKey, GoStringWrap rootPath) {
+    MMKV *kv = nullptr;
+    if (!mmapID.ptr) {
+        return kv;
+    }
+    auto str = string(mmapID.ptr, mmapID.length);
+
+    bool done = false;
+    if (cryptKey.ptr) {
+        auto crypt = string(cryptKey.ptr, cryptKey.length);
+        if (crypt.length() > 0) {
+            if (rootPath.ptr) {
+                auto path = string(rootPath.ptr, rootPath.length);
+                kv = MMKV::mmkvWithID(str, (MMKVMode) mode, &crypt, &path);
+            } else {
+                kv = MMKV::mmkvWithID(str, (MMKVMode) mode, &crypt, nullptr);
+            }
+            done = true;
+        }
+    }
+    if (!done) {
+        if (rootPath.ptr) {
+            auto path = string(rootPath.ptr, rootPath.length);
+            kv = MMKV::mmkvWithID(str, (MMKVMode) mode, nullptr, &path);
+        } else {
+            kv = MMKV::mmkvWithID(str, (MMKVMode) mode, nullptr, nullptr);
+        }
+    }
+
+    return kv;
+}
+
+MMKV_EXPORT void *getDefaultMMKV(int32_t mode, GoStringWrap cryptKey) {
+    MMKV *kv = nullptr;
+
+    if (cryptKey.ptr) {
+        auto crypt = string(cryptKey.ptr, cryptKey.length);
+        if (crypt.length() > 0) {
+            kv = MMKV::defaultMMKV((MMKVMode) mode, &crypt);
+        }
+    }
+    if (!kv) {
+        kv = MMKV::defaultMMKV((MMKVMode) mode, nullptr);
+    }
+
+    return kv;
+}
+
+MMKV_EXPORT const char *mmapID(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        return kv->mmapID().c_str();
+    }
+    return nullptr;
+}
+
+MMKV_EXPORT bool encodeBool(void *handle, GoStringWrap oKey, bool value) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->set((bool) value, key);
+    }
+    return false;
+}
+
+MMKV_EXPORT bool decodeBool(void *handle, GoStringWrap oKey, bool defaultValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->getBool(key, defaultValue);
+    }
+    return defaultValue;
+}
+
+MMKV_EXPORT bool encodeInt32(void *handle, GoStringWrap oKey, int32_t value) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->set((int32_t) value, key);
+    }
+    return false;
+}
+
+MMKV_EXPORT int32_t decodeInt32(void *handle, GoStringWrap oKey, int32_t defaultValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->getInt32(key, defaultValue);
+    }
+    return defaultValue;
+}
+
+MMKV_EXPORT bool encodeUInt32(void *handle, GoStringWrap oKey, uint32_t value) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->set(value, key);
+    }
+    return false;
+}
+
+MMKV_EXPORT uint32_t decodeUInt32(void *handle, GoStringWrap oKey, uint32_t defaultValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->getUInt32(key, defaultValue);
+    }
+    return defaultValue;
+}
+
+MMKV_EXPORT bool encodeInt64(void *handle, GoStringWrap oKey, int64_t value) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->set((int64_t) value, key);
+    }
+    return false;
+}
+
+MMKV_EXPORT int64_t decodeInt64(void *handle, GoStringWrap oKey, int64_t defaultValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->getInt64(key, defaultValue);
+    }
+    return defaultValue;
+}
+
+MMKV_EXPORT bool encodeUInt64(void *handle, GoStringWrap oKey, uint64_t value) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->set(value, key);
+    }
+    return false;
+}
+
+MMKV_EXPORT uint64_t decodeUInt64(void *handle, GoStringWrap oKey, uint64_t defaultValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->getUInt64(key, defaultValue);
+    }
+    return defaultValue;
+}
+
+MMKV_EXPORT bool encodeFloat(void *handle, GoStringWrap oKey, float value) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->set((float) value, key);
+    }
+    return false;
+}
+
+MMKV_EXPORT float decodeFloat(void *handle, GoStringWrap oKey, float defaultValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->getFloat(key, defaultValue);
+    }
+    return defaultValue;
+}
+
+MMKV_EXPORT bool encodeDouble(void *handle, GoStringWrap oKey, double value) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->set((double) value, key);
+    }
+    return false;
+}
+
+MMKV_EXPORT double decodeDouble(void *handle, GoStringWrap oKey, double defaultValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->getDouble(key, defaultValue);
+    }
+    return defaultValue;
+}
+
+MMKV_EXPORT bool encodeBytes(void *handle, GoStringWrap oKey, GoStringWrap oValue) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        if (oValue.ptr) {
+            auto value = MMBuffer((void *) oValue.ptr, oValue.length, MMBufferNoCopy);
+            return kv->set(value, key);
+        } else {
+            kv->removeValueForKey(key);
+            return true;
+        }
+    }
+    return false;
+}
+
+MMKV_EXPORT void *decodeBytes(void *handle, GoStringWrap oKey, uint64_t *lengthPtr) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        auto value = kv->getBytes(key);
+        if (value.length() > 0) {
+            if (value.isStoredOnStack()) {
+                auto result = malloc(value.length());
+                if (result) {
+                    memcpy(result, value.getPtr(), value.length());
+                    *lengthPtr = value.length();
+                }
+                return result;
+            } else {
+                void *result = value.getPtr();
+                *lengthPtr = value.length();
+                value.detach();
+                return result;
+            }
+        }
+    }
+    return nullptr;
+}
+
+#    ifndef MMKV_DISABLE_CRYPT
+
+MMKV_EXPORT bool reKey(void *handle, GoStringWrap oKey) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        if (oKey.ptr && oKey.length > 0) {
+            string key(oKey.ptr, oKey.length);
+            return kv->reKey(key);
+        } else {
+            return kv->reKey(string());
+        }
+    }
+    return false;
+}
+
+MMKV_EXPORT void *cryptKey(void *handle, uint32_t *lengthPtr) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && lengthPtr) {
+        auto cryptKey = kv->cryptKey();
+        if (cryptKey.length() > 0) {
+            auto ptr = malloc(cryptKey.length());
+            if (ptr) {
+                memcpy(ptr, cryptKey.data(), cryptKey.length());
+                *lengthPtr = cryptKey.length();
+                return ptr;
+            }
+        }
+    }
+    return nullptr;
+}
+
+MMKV_EXPORT void checkReSetCryptKey(void *handle, GoStringWrap oKey) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        if (oKey.ptr && oKey.length > 0) {
+            string key(oKey.ptr, oKey.length);
+            kv->checkReSetCryptKey(&key);
+        } else {
+            kv->checkReSetCryptKey(nullptr);
+        }
+    }
+}
+
+#    endif // MMKV_DISABLE_CRYPT
+
+MMKV_EXPORT GoStringWrap *allKeys(void *handle, uint64_t *lengthPtr) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        auto keys = kv->allKeys();
+        if (!keys.empty()) {
+            auto keyArray = (GoStringWrap *) calloc(keys.size(), sizeof(GoStringWrap));
+            if (!keyArray) {
+                return nullptr;
+            }
+
+            for (size_t index = 0; index < keys.size(); index++) {
+                auto &key = keys[index];
+                auto &stringWrap = keyArray[index];
+                stringWrap.length = static_cast<uint32_t>(key.length());
+                stringWrap.ptr = (char *) malloc(key.length());
+                if (stringWrap.ptr) {
+                    memcpy((void *) stringWrap.ptr, key.data(), key.length());
+                }
+            }
+            *lengthPtr = keys.size();
+            return keyArray;
+        }
+    }
+    return nullptr;
+}
+
+MMKV_EXPORT bool containsKey(void *handle, GoStringWrap oKey) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        return kv->containsKey(key);
+    }
+    return false;
+}
+
+MMKV_EXPORT uint64_t count(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        return kv->count();
+    }
+    return 0;
+}
+
+MMKV_EXPORT uint64_t totalSize(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        return kv->totalSize();
+    }
+    return 0;
+}
+
+MMKV_EXPORT uint64_t actualSize(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        return kv->actualSize();
+    }
+    return 0;
+}
+
+MMKV_EXPORT void removeValueForKey(void *handle, GoStringWrap oKey) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && oKey.ptr) {
+        auto key = string(oKey.ptr, oKey.length);
+        kv->removeValueForKey(key);
+    }
+}
+
+MMKV_EXPORT void removeValuesForKeys(void *handle, GoStringWrap *keyArray, uint64_t count) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv && keyArray && count > 0) {
+        vector<string> arrKeys;
+        arrKeys.reserve(count);
+        for (uint64_t index = 0; index < count; index++) {
+            auto &stringWrap = keyArray[index];
+            if (stringWrap.ptr && stringWrap.length > 0) {
+                arrKeys.emplace_back(stringWrap.ptr, stringWrap.length);
+            }
+        }
+        if (!arrKeys.empty()) {
+            kv->removeValuesForKeys(arrKeys);
+        }
+    }
+}
+
+MMKV_EXPORT void clearAll(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        kv->clearAll();
+    }
+}
+
+MMKV_EXPORT void mmkvSync(void *handle, bool sync) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        kv->sync((SyncFlag) sync);
+    }
+}
+
+MMKV_EXPORT void clearMemoryCache(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        kv->clearMemoryCache();
+    }
+}
+
+MMKV_EXPORT int32_t pageSize() {
+    return static_cast<int32_t>(DEFAULT_MMAP_SIZE);
+}
+
+MMKV_EXPORT const char *version() {
+    return MMKV_VERSION;
+}
+
+MMKV_EXPORT void trim(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        kv->trim();
+    }
+}
+
+MMKV_EXPORT void mmkvClose(void *handle) {
+    MMKV *kv = static_cast<MMKV *>(handle);
+    if (kv) {
+        kv->close();
+    }
+}
+
+MMKV_EXPORT bool backupOneToDirectory(GoStringWrap_t mmapID, GoStringWrap_t dstDir, GoStringWrap_t srcDir) {
+    if (!mmapID.ptr || !dstDir.ptr) {
+        return false;
+    }
+    auto id = string(mmapID.ptr, mmapID.length);
+    auto dst = string(dstDir.ptr, dstDir.length);
+    if (srcDir.ptr) {
+        auto src = string(srcDir.ptr, srcDir.length);
+        return MMKV::backupOneToDirectory(id, dst, &src);
+    }
+    return MMKV::backupOneToDirectory(id, dst, nullptr);
+}
+
+MMKV_EXPORT bool restoreOneFromDirectory(GoStringWrap_t mmapID, GoStringWrap_t srcDir, GoStringWrap_t dstDir) {
+    if (!mmapID.ptr || !srcDir.ptr) {
+        return false;
+    }
+    auto id = string(mmapID.ptr, mmapID.length);
+    auto src = string(srcDir.ptr, srcDir.length);
+    if (dstDir.ptr) {
+        auto dst = string(dstDir.ptr, dstDir.length);
+        return MMKV::restoreOneFromDirectory(id, src, &dst);
+    }
+    return MMKV::restoreOneFromDirectory(id, src, nullptr);
+}
+
+MMKV_EXPORT uint64_t backupAllToDirectory(GoStringWrap_t dstDir, GoStringWrap_t srcDir) {
+    if (!dstDir.ptr) {
+        return 0;
+    }
+
+    auto dst = string(dstDir.ptr, dstDir.length);
+    if (srcDir.ptr) {
+        auto src = string(srcDir.ptr, srcDir.length);
+        return MMKV::backupAllToDirectory(dst, &src);
+    }
+    return MMKV::backupAllToDirectory(dst, nullptr);
+}
+
+MMKV_EXPORT uint64_t restoreAllFromDirectory(GoStringWrap_t srcDir, GoStringWrap_t dstDir) {
+    if (!srcDir.ptr) {
+        return 0;
+    }
+
+    auto src = string(srcDir.ptr, srcDir.length);
+    if (dstDir.ptr) {
+        auto dst = string(dstDir.ptr, dstDir.length);
+        return MMKV::restoreAllFromDirectory(src, &dst);
+    }
+    return MMKV::restoreAllFromDirectory(src, nullptr);
+}
+
+extern "C" void myLogHandler(int64_t level, GoStringWrap file, int64_t line, GoStringWrap function, GoStringWrap message);
+
+void cLogHandler(MMKVLogLevel level, const char *file, int line, const char *function, const std::string &message) {
+    GoStringWrap oFile { file, static_cast<int64_t>(strlen(file)) };
+    GoStringWrap oFunction { function, static_cast<int64_t>(strlen(function)) };
+    GoStringWrap oMessage { message.data(), static_cast<int64_t>(message.length()) };
+
+    myLogHandler(level, oFile, line, oFunction, oMessage);
+}
+
+void setWantsLogRedirect(bool redirect) {
+    if (redirect) {
+        MMKV::registerLogHandler(&cLogHandler);
+    } else {
+        MMKV::unRegisterLogHandler();
+    }
+}
+
+extern "C" int64_t myErrorHandler(GoStringWrap mmapID, int64_t error);
+
+static MMKVRecoverStrategic cErrorHandler(const std::string &mmapID, MMKVErrorType errorType) {
+    GoStringWrap oID { mmapID.data(), static_cast<int64_t>(mmapID.length()) };
+
+    return static_cast<MMKVRecoverStrategic>(myErrorHandler(oID, static_cast<int64_t>(errorType)));
+}
+
+void setWantsErrorHandle(bool errorHandle) {
+    if (errorHandle) {
+        MMKV::registerErrorHandler(&cErrorHandler);
+    } else {
+        MMKV::unRegisterErrorHandler();
+    }
+}
+
+extern "C" void myContentChangeHandler(GoStringWrap mmapID);
+
+static void cContentChangeHandler(const std::string &mmapID) {
+    GoStringWrap oID { mmapID.data(), static_cast<int64_t>(mmapID.length()) };
+
+    myContentChangeHandler(oID);
+}
+
+void setWantsContentChangeHandle(bool errorHandle) {
+    if (errorHandle) {
+        MMKV::registerContentChangeHandler(&cContentChangeHandler);
+    } else {
+        MMKV::unRegisterContentChangeHandler();
+    }
+}
+
+#endif // CGO

golang-bridge.h

@@ -0,0 +1,106 @@
+/*
+ * Tencent is pleased to support the open source community by making
+ * MMKV available.
+ *
+ * Copyright (C) 2020 THL A29 Limited, a Tencent company.
+ * All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License"); you may not use
+ * this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *       https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifdef __cplusplus
+#    include <cstdint>
+extern "C" {
+#else
+#    include <stdbool.h>
+#    include <stdint.h>
+#endif
+
+struct GoStringWrap {
+    const char *ptr;
+    int64_t length;
+};
+typedef struct GoStringWrap GoStringWrap_t;
+
+struct GoSliceWrap {
+    void *array;
+    int64_t length;
+    int64_t capacity;
+};
+typedef struct GoSliceWrap GoSliceWrap_t;
+
+void mmkvInitialize(GoStringWrap_t rootDir, int32_t logLevel);
+void onExit();
+
+void *getMMKVWithID(GoStringWrap_t mmapID, int32_t mode, GoStringWrap_t cryptKey, GoStringWrap_t rootPath);
+void *getDefaultMMKV(int32_t mode, GoStringWrap_t cryptKey);
+const char *mmapID(void *handle);
+
+bool encodeBool(void *handle, GoStringWrap_t oKey, bool value);
+bool decodeBool(void *handle, GoStringWrap_t oKey, bool defaultValue);
+
+bool encodeInt32(void *handle, GoStringWrap_t oKey, int32_t value);
+int32_t decodeInt32(void *handle, GoStringWrap_t oKey, int32_t defaultValue);
+
+bool encodeUInt32(void *handle, GoStringWrap_t oKey, uint32_t value);
+uint32_t decodeUInt32(void *handle, GoStringWrap_t oKey, uint32_t defaultValue);
+
+bool encodeInt64(void *handle, GoStringWrap_t oKey, int64_t value);
+int64_t decodeInt64(void *handle, GoStringWrap_t oKey, int64_t defaultValue);
+
+bool encodeUInt64(void *handle, GoStringWrap_t oKey, uint64_t value);
+uint64_t decodeUInt64(void *handle, GoStringWrap_t oKey, uint64_t defaultValue);
+
+bool encodeFloat(void *handle, GoStringWrap_t oKey, float value);
+float decodeFloat(void *handle, GoStringWrap_t oKey, float defaultValue);
+
+bool encodeDouble(void *handle, GoStringWrap_t oKey, double value);
+double decodeDouble(void *handle, GoStringWrap_t oKey, double defaultValue);
+
+bool encodeBytes(void *handle, GoStringWrap_t oKey, GoStringWrap_t oValue);
+void *decodeBytes(void *handle, GoStringWrap_t oKey, uint64_t *lengthPtr);
+
+bool reKey(void *handle, GoStringWrap_t oKey);
+void *cryptKey(void *handle, uint32_t *lengthPtr);
+void checkReSetCryptKey(void *handle, GoStringWrap_t oKey);
+
+GoStringWrap_t *allKeys(void *handle, uint64_t *lengthPtr);
+bool containsKey(void *handle, GoStringWrap_t oKey);
+uint64_t count(void *handle);
+uint64_t totalSize(void *handle);
+uint64_t actualSize(void *handle);
+
+void removeValueForKey(void *handle, GoStringWrap_t oKey);
+void removeValuesForKeys(void *handle, GoStringWrap_t *keyArray, uint64_t count);
+void clearAll(void *handle);
+
+void mmkvSync(void *handle, bool sync);
+void clearMemoryCache(void *handle);
+void trim(void *handle);
+void mmkvClose(void *handle);
+
+bool backupOneToDirectory(GoStringWrap_t mmapID, GoStringWrap_t dstDir, GoStringWrap_t srcDir);
+bool restoreOneFromDirectory(GoStringWrap_t mmapID, GoStringWrap_t srcDir, GoStringWrap_t dstDir);
+uint64_t backupAllToDirectory(GoStringWrap_t dstDir, GoStringWrap_t srcDir);
+uint64_t restoreAllFromDirectory(GoStringWrap_t srcDir, GoStringWrap_t dstDir);
+
+int32_t pageSize();
+const char *version();
+
+void setWantsLogRedirect(bool redirect);
+void setWantsErrorHandle(bool errorHandle);
+void setWantsContentChangeHandle(bool contentChange);
+
+#ifdef __cplusplus
+}
+#endif

mmkv.go

@@ -0,0 +1,538 @@
+/*
+ * Tencent is pleased to support the open source community by making
+ * MMKV available.
+ *
+ * Copyright (C) 2020 THL A29 Limited, a Tencent company.
+ * All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License"); you may not use
+ * this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *       https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// MMKV is a cross-platform key-value storage framework developed by WeChat.
+package mmkv
+
+// #cgo CXXFLAGS: -D CGO -D FORCE_POSIX -I ${SRCDIR}/../../Core -std=c++17
+// #cgo LDFLAGS: -L./lib -lmmkv -lcore -lz -lpthread
+/*
+#include "golang-bridge.h"
+#include <stdlib.h>
+
+typedef void* voidptr_t;
+
+static GoStringWrap_t wrapGoString(_GoString_ str) {
+    GoStringWrap_t wrap = { _GoStringPtr(str), _GoStringLen(str) };
+    return wrap;
+}
+
+static GoStringWrap_t GoStringWrapNil() {
+	GoStringWrap_t result = { 0, 0 };
+	return result;
+}
+
+static GoStringWrap_t wrapGoByteSlice(const void *ptr, size_t len) {
+    GoStringWrap_t wrap = { ptr, len };
+    return wrap;
+}
+
+static void freeStringArray(GoStringWrap_t *a, size_t size) {
+    for (size_t i = 0; i < size; i++) {
+        free((void*) a[i].ptr);
+    }
+}
+*/
+import "C"
+import "unsafe"
+
+const (
+	MMKVLogDebug = iota // not available for release/product build
+	MMKVLogInfo         // default level
+	MMKVLogWarning
+	MMKVLogError
+	MMKVLogNone // special level used to disable all log messages
+)
+
+const (
+	MMKV_SINGLE_PROCESS = 1 << iota
+	MMKV_MULTI_PROCESS
+)
+
+// a wrapper of native C memory, efficient for simple usage
+// must call MMBuffer.Destroy() after no longer usage
+type MMBuffer struct {
+	ptr    uintptr
+	length int
+}
+
+// the address of underlying memory
+func (buffer MMBuffer) Pointer() uintptr {
+	return buffer.ptr
+}
+
+// the size of underlying memory
+func (buffer MMBuffer) Length() int {
+	return buffer.length
+}
+
+// get byte slice view of underlying memory
+// the slice is valid as long as MMBuffer.Destroy() not called
+func (buffer MMBuffer) ByteSliceView() []byte {
+	bytes := (*[1 << 30]byte)(unsafe.Pointer(buffer.ptr))[0:buffer.length:buffer.length]
+	return bytes
+}
+
+// get string view of underlying memory
+// the string is valid as long as MMBuffer.Destroy() not called
+func (buffer MMBuffer) StringView() string {
+	return *((*string)(unsafe.Pointer(&buffer)))
+}
+
+// must call Destroy() after no longer usage
+func (buffer MMBuffer) Destroy() {
+	C.free(unsafe.Pointer(buffer.ptr))
+}
+
+type MMKV interface {
+	SetBool(value bool, key string) bool
+	GetBool(key string) bool
+	GetBoolWithDefault(key string, defaultValue bool) bool
+
+	SetInt32(value int32, key string) bool
+	GetInt32(key string) int32
+	GetInt32WithDefault(key string, defaultValue int32) int32
+
+	SetInt64(value int64, key string) bool
+	GetInt64(key string) int64
+	GetInt64WithDefault(key string, defaultValue int64) int64
+
+	SetUInt32(value uint32, key string) bool
+	GetUInt32(key string) uint32
+	GetUInt32WithDefault(key string, defaultValue uint32) uint32
+
+	SetUInt64(value uint64, key string) bool
+	GetUInt64(key string) uint64
+	GetUInt64WithDefault(key string, defaultValue uint64) uint64
+
+	SetFloat32(value float32, key string) bool
+	GetFloat32(key string) float32
+	GetFloat32WithDefault(key string, defaultValue float32) float32
+
+	SetFloat64(value float64, key string) bool
+	GetFloat64(key string) float64
+	GetFloat64WithDefault(key string, defaultValue float64) float64
+
+	// string value should be utf-8 encoded
+	SetString(value string, key string) bool
+	GetString(key string) string
+	// get C memory directly (without memcpy), much more efferent for large value
+	GetStringBuffer(key string) MMBuffer
+
+	SetBytes(value []byte, key string) bool
+	GetBytes(key string) []byte
+	// get C memory directly (without memcpy), much more efferent for large value
+	GetBytesBuffer(key string) MMBuffer
+
+	RemoveKey(key string)
+	RemoveKeys(keys []string)
+
+	// clear all key-values
+	ClearAll()
+
+	// return count of keys
+	Count() uint64
+
+	AllKeys() []string
+	Contains(key string) bool
+
+	// total size of the file
+	TotalSize() uint64
+
+	// actual used size of the file
+	ActualSize() uint64
+
+	// the mmapID of the instance
+	MMAP_ID() string
+
+	/* Synchronize memory to file. You don't need to call this, really, I mean it. Unless you worry about running out of battery.
+	 * Pass true to perform synchronous write.
+	 * Pass false to perform asynchronous write, return immediately.
+	 */
+	Sync(sync bool)
+	// Clear all caches (on memory warning).
+	ClearMemoryCache()
+
+	/* Trim the file size to minimal.
+	 * MMKV's size won't reduce after deleting key-values.
+	 * Call this method after lots of deleting if you care about disk usage.
+	 * Note that clearAll() has the similar effect.
+	 */
+	Trim()
+
+	// Close the instance when it's no longer needed in the near future.
+	// Any subsequent call to the instance is undefined behavior.
+	Close()
+
+	/* Change encryption key for the MMKV instance.
+	 * The cryptKey is 16 bytes limited.
+	 * You can transfer a plain-text MMKV into encrypted by setting an non-null, non-empty cryptKey.
+	 * Or vice versa by passing cryptKey with null. See also checkReSetCryptKey().
+	 */
+	ReKey(newKey string) bool
+
+	// Just reset the cryptKey (will not encrypt or decrypt anything).
+	// Usually you should call this method after other process reKey() the multi-process mmkv.
+	CheckReSetCryptKey(key string)
+
+	// See also reKey().
+	CryptKey() string
+}
+
+type ctorMMKV uintptr
+
+// return the version of MMKV
+func Version() string {
+	version := C.version()
+	goStr := C.GoString(version)
+	return goStr
+}
+
+/* MMKV must be initialized before any usage.
+ * Generally speaking you should do this inside main():
+func main() {
+	mmkv.InitializeMMKV("/path/to/my/working/dir")
+	// other logic
+}
+*/
+func InitializeMMKV(rootDir string) {
+	C.mmkvInitialize(C.wrapGoString(rootDir), MMKVLogInfo)
+}
+
+// Same as the function InitializeMMKV() above, except that you can customize MMKV's log level by passing logLevel.
+// You can even turnoff logging by passing MMKVLogNone, which we don't recommend doing.
+func InitializeMMKVWithLogLevel(rootDir string, logLevel int) {
+	C.mmkvInitialize(C.wrapGoString(rootDir), C.int32_t(logLevel))
+}
+
+// Call before App exists, it's just fine not calling it on most case (except when the device shutdown suddenly).
+func OnExit() {
+	C.onExit()
+}
+
+// return the page size of memory
+func PageSize() int32 {
+	return int32(C.pageSize())
+}
+
+// a generic purpose instance in single-process mode.
+func DefaultMMKV() MMKV {
+	mmkv := ctorMMKV(C.getDefaultMMKV(MMKV_SINGLE_PROCESS, C.GoStringWrapNil()))
+	return MMKV(mmkv)
+}
+
+// a generic purpose instance in single-process or multi-process mode.
+func DefaultMMKVWithMode(mode int) MMKV {
+	mmkv := ctorMMKV(C.getDefaultMMKV(C.int(mode), C.GoStringWrapNil()))
+	return MMKV(mmkv)
+}
+
+// an encrypted generic purpose instance in single-process or multi-process mode.
+func DefaultMMKVWithModeAndCryptKey(mode int, cryptKey string) MMKV {
+	mmkv := ctorMMKV(C.getDefaultMMKV(MMKV_SINGLE_PROCESS, C.wrapGoString(cryptKey)))
+	return MMKV(mmkv)
+}
+
+// an instance with specific location ${MMKV Root}/mmapID, in single-process mode.
+func MMKVWithID(mmapID string) MMKV {
+	cStrNull := C.GoStringWrapNil()
+	mmkv := ctorMMKV(C.getMMKVWithID(C.wrapGoString(mmapID), MMKV_SINGLE_PROCESS, cStrNull, cStrNull))
+	return MMKV(mmkv)
+}
+
+// an instance with specific location ${MMKV Root}/mmapID, in single-process or multi-process mode.
+func MMKVWithIDAndMode(mmapID string, mode int) MMKV {
+	cStrNull := C.GoStringWrapNil()
+	mmkv := ctorMMKV(C.getMMKVWithID(C.wrapGoString(mmapID), C.int(mode), cStrNull, cStrNull))
+	return MMKV(mmkv)
+}
+
+// an encrypted instance with specific location ${MMKV Root}/mmapID, in single-process or multi-process mode.
+func MMKVWithIDAndModeAndCryptKey(mmapID string, mode int, cryptKey string) MMKV {
+	cStrNull := C.GoStringWrapNil()
+	mmkv := ctorMMKV(C.getMMKVWithID(C.wrapGoString(mmapID), C.int(mode), C.wrapGoString(cryptKey), cStrNull))
+	return MMKV(mmkv)
+}
+
+// backup one MMKV instance (from the root dir of MMKV) to dstDir
+func BackupOneToDirectory(mmapID string, dstDir string) bool {
+	cStrNull := C.GoStringWrapNil()
+	ret := C.backupOneToDirectory(C.wrapGoString(mmapID), C.wrapGoString(dstDir), cStrNull)
+	return bool(ret)
+}
+
+// restore one MMKV instance from srcDir (to the root dir of MMKV)
+func RestoreOneFromDirectory(mmapID string, srcDir string) bool {
+	cStrNull := C.GoStringWrapNil()
+	ret := C.restoreOneFromDirectory(C.wrapGoString(mmapID), C.wrapGoString(srcDir), cStrNull)
+	return bool(ret)
+}
+
+// backup all MMKV instance (from the root dir of MMKV) to dstDir
+// return count of MMKV successfully backup-ed
+func BackupAllToDirectory(dstDir string) uint64 {
+	cStrNull := C.GoStringWrapNil()
+	ret := C.backupAllToDirectory(C.wrapGoString(dstDir), cStrNull)
+	return uint64(ret)
+}
+
+// restore all MMKV instance from srcDir (to the root dir of MMKV)
+// return count of MMKV successfully restored
+func RestoreAllFromDirectory(srcDir string) uint64 {
+	cStrNull := C.GoStringWrapNil()
+	ret := C.restoreAllFromDirectory(C.wrapGoString(srcDir), cStrNull)
+	return uint64(ret)
+}
+
+func (kv ctorMMKV) SetBool(value bool, key string) bool {
+	ret := C.encodeBool(unsafe.Pointer(kv), C.wrapGoString(key), C.bool(value))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetBool(key string) bool {
+	return kv.GetBoolWithDefault(key, false)
+}
+
+func (kv ctorMMKV) GetBoolWithDefault(key string, defaultValue bool) bool {
+	value := C.decodeBool(unsafe.Pointer(kv), C.wrapGoString(key), C.bool(defaultValue))
+	return bool(value)
+}
+
+func (kv ctorMMKV) SetInt32(value int32, key string) bool {
+	ret := C.encodeInt32(unsafe.Pointer(kv), C.wrapGoString(key), C.int32_t(value))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetInt32(key string) int32 {
+	return kv.GetInt32WithDefault(key, 0)
+}
+
+func (kv ctorMMKV) GetInt32WithDefault(key string, defaultValue int32) int32 {
+	value := C.decodeInt32(unsafe.Pointer(kv), C.wrapGoString(key), C.int32_t(defaultValue))
+	return int32(value)
+}
+
+func (kv ctorMMKV) SetUInt32(value uint32, key string) bool {
+	ret := C.encodeUInt32(unsafe.Pointer(kv), C.wrapGoString(key), C.uint32_t(value))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetUInt32(key string) uint32 {
+	return kv.GetUInt32WithDefault(key, 0)
+}
+
+func (kv ctorMMKV) GetUInt32WithDefault(key string, defaultValue uint32) uint32 {
+	value := C.decodeUInt32(unsafe.Pointer(kv), C.wrapGoString(key), C.uint32_t(defaultValue))
+	return uint32(value)
+}
+
+func (kv ctorMMKV) SetInt64(value int64, key string) bool {
+	ret := C.encodeInt64(unsafe.Pointer(kv), C.wrapGoString(key), C.int64_t(value))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetInt64(key string) int64 {
+	return kv.GetInt64WithDefault(key, 0)
+}
+
+func (kv ctorMMKV) GetInt64WithDefault(key string, defaultValue int64) int64 {
+	value := C.decodeInt64(unsafe.Pointer(kv), C.wrapGoString(key), C.int64_t(defaultValue))
+	return int64(value)
+}
+
+func (kv ctorMMKV) SetUInt64(value uint64, key string) bool {
+	ret := C.encodeUInt64(unsafe.Pointer(kv), C.wrapGoString(key), C.uint64_t(value))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetUInt64(key string) uint64 {
+	return kv.GetUInt64WithDefault(key, 0)
+}
+
+func (kv ctorMMKV) GetUInt64WithDefault(key string, defaultValue uint64) uint64 {
+	value := C.decodeUInt64(unsafe.Pointer(kv), C.wrapGoString(key), C.uint64_t(defaultValue))
+	return uint64(value)
+}
+
+func (kv ctorMMKV) SetFloat32(value float32, key string) bool {
+	ret := C.encodeFloat(unsafe.Pointer(kv), C.wrapGoString(key), C.float(value))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetFloat32(key string) float32 {
+	return kv.GetFloat32WithDefault(key, 0)
+}
+
+func (kv ctorMMKV) GetFloat32WithDefault(key string, defaultValue float32) float32 {
+	value := C.decodeFloat(unsafe.Pointer(kv), C.wrapGoString(key), C.float(defaultValue))
+	return float32(value)
+}
+
+func (kv ctorMMKV) SetFloat64(value float64, key string) bool {
+	ret := C.encodeDouble(unsafe.Pointer(kv), C.wrapGoString(key), C.double(value))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetFloat64(key string) float64 {
+	return kv.GetFloat64WithDefault(key, 0)
+}
+
+func (kv ctorMMKV) GetFloat64WithDefault(key string, defaultValue float64) float64 {
+	value := C.decodeDouble(unsafe.Pointer(kv), C.wrapGoString(key), C.double(defaultValue))
+	return float64(value)
+}
+
+func (kv ctorMMKV) SetString(value string, key string) bool {
+	cValue := C.wrapGoString(value)
+	ret := C.encodeBytes(unsafe.Pointer(kv), C.wrapGoString(key), cValue)
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetString(key string) string {
+	var length uint64
+
+	cValue := C.decodeBytes(unsafe.Pointer(kv), C.wrapGoString(key), (*C.uint64_t)(&length))
+	value := C.GoStringN((*C.char)(cValue), C.int(length))
+
+	C.free(unsafe.Pointer(cValue))
+	return value
+}
+
+func (kv ctorMMKV) GetStringBuffer(key string) MMBuffer {
+	return kv.GetBytesBuffer(key)
+}
+
+func (kv ctorMMKV) SetBytes(value []byte, key string) bool {
+	cValue := C.wrapGoByteSlice(unsafe.Pointer(&value[0]), C.size_t(len(value)))
+	ret := C.encodeBytes(unsafe.Pointer(kv), C.wrapGoString(key), cValue)
+	return bool(ret)
+}
+
+func (kv ctorMMKV) GetBytes(key string) []byte {
+	var length uint64
+
+	cValue := C.decodeBytes(unsafe.Pointer(kv), C.wrapGoString(key), (*C.uint64_t)(&length))
+	value := C.GoBytes(unsafe.Pointer(cValue), C.int(length))
+
+	C.free(unsafe.Pointer(cValue))
+	return value
+}
+
+func (kv ctorMMKV) GetBytesBuffer(key string) MMBuffer {
+	var length uint64
+
+	cValue := C.decodeBytes(unsafe.Pointer(kv), C.wrapGoString(key), (*C.uint64_t)(&length))
+	value := MMBuffer{uintptr(cValue), int(length)}
+
+	return value
+}
+
+func (kv ctorMMKV) RemoveKey(key string) {
+	C.removeValueForKey(unsafe.Pointer(kv), C.wrapGoString(key))
+}
+
+func (kv ctorMMKV) RemoveKeys(keys []string) {
+	keyArray := (*C.struct_GoStringWrap)(unsafe.Pointer(&keys[0]))
+	C.removeValuesForKeys(unsafe.Pointer(kv), keyArray, C.uint64_t(len(keys)))
+}
+
+func (kv ctorMMKV) Count() uint64 {
+	return uint64(C.count(unsafe.Pointer(kv)))
+}
+
+func (kv ctorMMKV) AllKeys() []string {
+	count := uint64(0)
+	keyArray := C.allKeys(unsafe.Pointer(kv), (*C.uint64_t)(&count))
+	if keyArray == nil || count == 0 {
+		return []string{}
+	}
+	// turn C array into go slice with offset(0), length(count) & capacity(count)
+	keys := (*[1 << 30]C.struct_GoStringWrap)(unsafe.Pointer(keyArray))[0:count:count]
+
+	// Actually the keys IS a go string slice, but we need to COPY the elements for the caller to use.
+	// Too bad go doesn't has destructors, hence we can't simply TRANSFER ownership of C memory.
+	result := make([]string, count)
+	for index := uint64(0); index < count; index++ {
+		key := keys[index]
+		result[index] = C.GoStringN(key.ptr, C.int(key.length))
+	}
+
+	C.freeStringArray(keyArray, C.size_t(count))
+	C.free(unsafe.Pointer(keyArray))
+	return result
+}
+
+func (kv ctorMMKV) Contains(key string) bool {
+	ret := C.containsKey(unsafe.Pointer(kv), C.wrapGoString(key))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) ClearAll() {
+	C.clearAll(unsafe.Pointer(kv))
+}
+
+func (kv ctorMMKV) TotalSize() uint64 {
+	return uint64(C.totalSize(unsafe.Pointer(kv)))
+}
+
+func (kv ctorMMKV) ActualSize() uint64 {
+	return uint64(C.actualSize(unsafe.Pointer(kv)))
+}
+
+func (kv ctorMMKV) MMAP_ID() string {
+	cStr := C.mmapID(unsafe.Pointer(kv))
+	return C.GoString(cStr)
+}
+
+func (kv ctorMMKV) Sync(sync bool) {
+	C.mmkvSync(unsafe.Pointer(kv), C.bool(sync))
+}
+
+func (kv ctorMMKV) ClearMemoryCache() {
+	C.clearMemoryCache(unsafe.Pointer(kv))
+}
+
+func (kv ctorMMKV) Trim() {
+	C.trim(unsafe.Pointer(kv))
+}
+
+func (kv ctorMMKV) Close() {
+	C.mmkvClose(unsafe.Pointer(kv))
+}
+
+func (kv ctorMMKV) ReKey(newKey string) bool {
+	ret := C.reKey(unsafe.Pointer(kv), C.wrapGoString(newKey))
+	return bool(ret)
+}
+
+func (kv ctorMMKV) CheckReSetCryptKey(key string) {
+	C.checkReSetCryptKey(unsafe.Pointer(kv), C.wrapGoString(key))
+}
+
+func (kv ctorMMKV) CryptKey() string {
+	var cLen C.uint32_t
+	cStr := C.cryptKey(unsafe.Pointer(kv), &cLen)
+	if cStr == nil || cLen == 0 {
+		return ""
+	}
+	result := C.GoStringN((*C.char)(cStr), C.int(cLen))
+	C.free(unsafe.Pointer(cStr))
+	return result
+}

mmkv_test.go

@@ -0,0 +1,33 @@
+/*
+ * Tencent is pleased to support the open source community by making
+ * MMKV available.
+ *
+ * Copyright (C) 2020 THL A29 Limited, a Tencent company.
+ * All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License"); you may not use
+ * this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *       https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package mmkv
+
+import (
+	"testing"
+	//     "regexp"
+)
+
+func TestVersionEmpty(t *testing.T) {
+	msg := Version()
+	if msg == "" {
+		t.Fatalf("Version() == \"\"")
+	}
+}