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English | 简体中文
","maintainers":[{"name":"zhangyuang","email":"569105585@qq.com"}],"readme":"# ffi-rs\n\n
\nEnglish | 简体中文\n
\n\nA module written in Rust and N-API provides interface (FFI) features for Node.js\n\n
\n\"githubActions\"\n\n\n\n\n
\n\n## Description\n\n[ffi-rs](https://github.com/zhangyuang/node-ffi-rs) is a high-performance module with small binary size written in Rust and N-API that provides FFI (Foreign Function Interface) features for Node.js. It allows developers to call functions written in other languages such as C++, C, and Rust directly from JavaScript without writing any C++ code.\n\nThis module aims to provide similar functionality to the node-ffi module but with a completely rewritten underlying codebase. The node-ffi module has been unmaintained for several years and is no longer usable, so ffi-rs was developed to fill that void.\n\n## Features\n\n* High performance ✨\n* Small binary size\n* Better type hints 🧐\n* Simpler data description and API interface 💗\n* Support more different data types between `Node.js` and `C` 😊\n* Support modifying data in place 🥸\n* Provide many ways to handle pointer type directly 🐮\n* Support running ffi task [in a new thread](#runInNewThread) 🤩️\n* Support output [errno](#errno) info 🤔️\n* No need to use [ref](https://www.npmjs.com/package/ref) to handle pointer 🤫\n\n## Benchmark\n\n```bash\n$ node bench/bench.js\nRunning \"ffi\" suite...\nProgress: 100%\n\n ffi-napi:\n 2 028 ops/s, ±4.87% | slowest, 99.24% slower\n\n ffi-rs:\n 318 467 ops/s, ±0.17% | fastest\n\nFinished 2 cases!\n Fastest: ffi-rs\n Slowest: ffi-napi\n```\n\n### How to sponsor me\n\nThere are two ways to sponsor me both Alipay and WeChat\n\nEth address: 0x87a2575a5d4dbD5f965e3e3a3d20641BC9a5d192\n\n
\n \n \n
\n\n## Changelog\n\nSee [CHANGELOG.md](./CHANGELOG.md)\n\n## Ecosystem\n\n[abstract-socket-rs](https://github.com/zhangyuang/abstract-socket-rs)\n\n## Install\n\n```bash\n$ npm i ffi-rs\n```\n\n## Supported Types\n\nCurrently, ffi-rs only supports these types of parameters and return values. However, support for more types may be added in the future based on actual usage scenarios.\n\n### Basic Types\n\n* [string](#basic-types)\n* [wideString|wstring](#basic-types)\n* [u8](#basic-types)\n* [i16](#basic-types)\n* [i32](#basic-types)\n* [i64](#basic-types)\n* [bigInt](#basic-types)\n* [u64](#basic-types)\n* [u32](#basic-types)\n* [void](#basic-types) (like js undefined)\n* [float](#basic-types) (can only be used as paramsType instead of retType)\n* [double](#basic-types)\n* [boolean](#basic-types)\n\n### Reference Types\n\n* [pointer](#pointer)\n* [u8Array](#buffer) (buffer)\n* [i16Array](#array)\n* [i32Array](#array)\n* [stringArray](#array)\n* [doubleArray](#array)\n* [floatArray](#array) (can only be used as paramsType instead of retType)\n* [structArray](#array)\n* [object](#struct) (Nested object is also supported in the latest version)\n* [function](#function)\n\n### C++ Class\n\nIf you want to call a C++ function whose argument type is a class, you can use the `pointer` type. See [tutorial](#C++)\n\n## Supported Platforms\n\nNote: You need to make sure that the compilation environment of the dynamic library is the same as the installation and runtime environment of the `ffi-rs` call.\n\n* darwin-x64\n* darwin-arm64\n* linux-x64-gnu\n* linux-x64-musl\n* win32-x64-msvc\n* win32-ia32-msvc\n* win32-arm64-msvc\n* linux-arm64-gnu\n* linux-arm64-musl\n* linux-arm-gnueabihf\n* android-arm64\n\n## Usage\n\nView [tests/index.ts](./tests/index.ts) for the latest usage\n\nHere is an example of how to use ffi-rs:\n\nFor the following C++ code, we compile this file into a dynamic library\n\n### Write Foreign Function Code\n\nNote: The return value type of a function must be of type C\n\n```cpp\n#include \n#include \n#include \n#include \n\nextern \"C\" int sum(int a, int b) { return a + b; }\n\nextern \"C\" double doubleSum(double a, double b) { return a + b; }\n\nextern \"C\" const char *concatenateStrings(const char *str1, const char *str2) {\n std::string result = std::string(str1) + std::string(str2);\n char *cstr = new char[result.length() + 1];\n strcpy(cstr, result.c_str());\n return cstr;\n}\n\nextern \"C\" void noRet() { printf(\"%s\", \"hello world\"); }\nextern \"C\" bool return_opposite(bool input) { return !input; }\nextern \"C\" uint32_t testU32(uint32_t a, uint32_t b) { return a + b; }\n```\n\n### Compile C Code into a Dynamic Library\n\n```bash\n$ g++ -dynamiclib -o libsum.so cpp/sum.cpp # macOS\n$ g++ -shared -o libsum.so cpp/sum.cpp # Linux\n$ g++ -shared -o sum.dll cpp/sum.cpp # Windows\n```\n\n### Call Dynamic Library Using ffi-rs\n\nThen you can use `ffi-rs` to invoke the dynamic library file that contains functions.\n\n### Initialization\n\nIt's suggested to develop with TypeScript to get type hints\n\n```js\nconst {\n equal\n} = require('assert')\nconst {\n load,\n DataType,\n open,\n close,\n arrayConstructor,\n define\n} = require('ffi-rs')\nconst a = 1\nconst b = 100\nconst dynamicLib = platform === 'win32' ? './sum.dll' : \"./libsum.so\"\n// First open dynamic library with key for close\n// It only needs to be opened once.\nopen({\n library: 'libsum', // key\n path: dynamicLib // path\n})\nconst r = load({\n library: \"libsum\", // path to the dynamic library file\n funcName: 'sum', // the name of the function to call\n retType: DataType.I32, // the return value type\n paramsType: [DataType.I32, DataType.I32], // the parameter types\n paramsValue: [a, b] // the actual parameter values\n // freeResultMemory: true, // whether or not need to free the result of return value memory automatically, default is false\n})\nequal(r, a + b)\n// Release library memory when you're not using it.\nclose('libsum')\n\n// Use define function to define a function signature\nconst res = define({\n sum: {\n library: \"libsum\",\n retType: DataType.I32,\n paramsType: [DataType.I32, DataType.I32],\n },\n atoi: {\n library: \"libnative\",\n retType: DataType.I32,\n paramsType: [DataType.String],\n }\n})\nequal(res.sum([1, 2]), 3)\nequal(res.atoi([\"1000\"]), 1000)\n```\n\n### Load Main Program Handle\n\nYou can also pass an empty path string in the `open` function like [ffi-napi](https://github.com/node-ffi-napi/node-ffi-napi?tab=readme-ov-file#example) to get the main program handle. Refer to [dlopen](https://man7.org/linux/man-pages/man3/dlopen.3.html)\n\n```js\nopen({\n library: \"libnative\",\n path: \"\",\n});\n// In Darwin/Linux, you can call the atoi function which is included in the basic C library\nequal(\n load({\n library: \"libnative\",\n funcName: \"atoi\",\n retType: DataType.I32,\n paramsType: [DataType.String],\n paramsValue: [\"1000\"],\n }),\n 1000,\n);\n```\n\n### Basic Types\n\n`number|string|boolean|double|void` are basic types\n\n```js\nconst c = \"foo\"\nconst d = c.repeat(200)\n\nequal(c + d, load({\n library: 'libsum',\n funcName: 'concatenateStrings',\n retType: DataType.String,\n paramsType: [DataType.String, DataType.String],\n paramsValue: [c, d]\n}))\n\nequal(undefined, load({\n library: 'libsum',\n funcName: 'noRet',\n retType: DataType.Void,\n paramsType: [],\n paramsValue: []\n}))\n\nequal(1.1 + 2.2, load({\n library: 'libsum',\n funcName: 'doubleSum',\n retType: DataType.Double,\n paramsType: [DataType.Double, DataType.Double],\n paramsValue: [1.1, 2.2]\n}))\nconst bool_val = true\nequal(!bool_val, load({\n library: 'libsum',\n funcName: 'return_opposite',\n retType: DataType.Boolean,\n paramsType: [DataType.Boolean],\n paramsValue: [bool_val],\n}))\n\n// U32 type usage\nequal(3147483647, load({\n library: 'libsum',\n funcName: 'testU32',\n retType: DataType.U32,\n paramsType: [DataType.U32, DataType.U32],\n paramsValue: [2147483647, 1000000000],\n}))\n```\n\n### Buffer\n\nIn the latest version, `ffi-rs` supports modifying data in place.\n\nThe sample code is as follows\n\n```c\nextern int modifyData(char* buffer) {\n // modify buffer data in place\n}\n```\n\n```js\nconst arr = Buffer.alloc(200) // create buffer\nconst res = load({\n library: \"libsum\",\n funcName: \"modifyData\",\n retType: DataType.I32,\n paramsType: [\n DataType.U8Array\n ],\n paramsValue: [arr]\n})\nconsole.log(arr) // buffer data can be updated\n```\n\n### Array\n\nWhen using `array` as `retType` , you should use `arrayConstructor` to specify the array type with a legal length which is important.\n\nIf the length is incorrect, the program may exit abnormally\n\n```cpp\nextern \"C\" int *createArrayi32(const int *arr, int size) {\n int *vec = (int *)malloc((size) * sizeof(int));\n\n for (int i = 0; i < size; i++) {\n vec[i] = arr[i];\n }\n return vec;\n}\nextern \"C\" double *createArrayDouble(const double *arr, int size) {\n double *vec = (double *)malloc((size) * sizeof(double));\n for (int i = 0; i < size; i++) {\n vec[i] = arr[i];\n }\n return vec;\n}\n\nextern \"C\" char **createArrayString(char **arr, int size) {\n char **vec = (char **)malloc((size) * sizeof(char *));\n for (int i = 0; i < size; i++) {\n vec[i] = arr[i];\n }\n return vec;\n}\n```\n\n```js\nlet bigArr = new Array(100).fill(100)\ndeepStrictEqual(bigArr, load({\n library: 'libsum',\n funcName: 'createArrayi32',\n retType: arrayConstructor({\n type: DataType.I32Array,\n length: bigArr.length\n }),\n paramsType: [DataType.I32Array, DataType.I32],\n paramsValue: [bigArr, bigArr.length],\n}))\n\nlet bigDoubleArr = new Array(5).fill(1.1)\ndeepStrictEqual(bigDoubleArr, load({\n library: 'libsum',\n funcName: 'createArrayDouble',\n retType: arrayConstructor({\n type: DataType.DoubleArray,\n length: bigDoubleArr.length\n }),\n paramsType: [DataType.DoubleArray, DataType.I32],\n paramsValue: [bigDoubleArr, bigDoubleArr.length],\n}))\nlet stringArr = [c, c.repeat(20)]\n\ndeepStrictEqual(stringArr, load({\n library: 'libsum',\n funcName: 'createArrayString',\n retType: arrayConstructor({\n type: DataType.StringArray,\n length: stringArr.length\n }),\n paramsType: [DataType.StringArray, DataType.I32],\n paramsValue: [stringArr, stringArr.length],\n}))\n```\n\n### Pointer\n\nThese functions are used to handle pointer types in `ffi-rs` . We use `DataType.External` to pass pointers between `Node.js` and `C` .\n\n#### Create Pointer\n\nUse `createPointer` to create a pointer for specific type in the code as follows:\n\n```js\nextern \"C\"\nvoid receiveNumPointer(const int * num)\n\n// use the rust type expression the pointer type is *const i32\nconst pointer: JsExternal[] = createPointer({\n paramsType: [DataType.I32],\n paramsValue: [100],\n})\n\nload({\n library: \"libsum\",\n funcName: \"receiveNumPointer\",\n paramsType: [DataType.External],\n paramsValue: pointer,\n retType: DataType.Void,\n})\n```\n\n#### unwrapPointer\n\nUse `createPointer` to create a data type which store in heap will receive a double pointer means a pointer to a pointer.\nSo we need to use `unwrapPointer` to get the inner pointer when call foreign function.\n\n```js\nextern \"C\"\nvoid receiveStringPointer(const char * str)\n\n// because of string is a pointer, so the pointer is a double pointer means a pointer to a string pointer\n// use the rust type expression pointer type is *mut *const char\nconst pointer: JsExternal[] = createPointer({\n paramsType: [DataType.String],\n paramsValue: [\"hello\"],\n})\n\nload({\n library: \"libsum\",\n funcName: \"receiveStringPointer\",\n paramsType: [DataType.External],\n paramsValue: unwrapPointer(pointer), // use the unwrapPointer to get the inner *mut *const char pointer, which points to a *const char value\n retType: DataType.Void,\n})\n```\n\n#### restorePointer\n\nIf you want to restore the pointer to the original value, you can use the `restorePointer` function. Corresponds to `createPointer` ,\nit can receive the result of `createPointer` and return the original pointer directly without `wrapPointer` or `unwrapPointer` .\n\n```js\nconst pointer: JsExternal[] = createPointer({\n paramsType: [DataType.String],\n paramsValue: [\"hello\"],\n})\nconst str = restorePointer({\n retType: [DataType.String],\n paramsValue: pointer,\n})\nequal(str, \"hello\")\n```\n\n#### wrapPointer\n\nUse `wrapPointer` when you want to restore the foreign function return value.\n\n```js\nextern \"C\" const char * returnStringPointer() {\n char * str = new char[6];\n strcpy(str, \"hello\");\n return str;\n}\n// the stringPointer type is *const char, we need to convert it to *mut *const char before call restorePointer\nconst stringPointer = load({\n library: \"libsum\",\n funcName: \"returnStringPointer\",\n retType: DataType.External,\n paramsType: [DataType.String],\n paramsValue: [\"hello\"],\n})\n\nconst wrapStringPointer = wrapPointer([stringPointer])\n\nconst str = restorePointer({\n retType: [DataType.String],\n paramsValue: wrapStringPointer,\n})\nequal(str, \"hello\")\n```\n\n#### freePointer\n\nUse `freePointer` to free the pointer when it is no longer in use.\n\n```js\nconst i32Ptr = createPointer({\n paramsType: [DataType.I32],\n paramsValue: [100]\n})\nconst i32Data = restorePointer({\n paramsValue: i32Ptr\n retType: [DataType.I32],\n})\nfreePointer({\n paramsType: [DataType.I32],\n paramsValue: i32Ptr,\n pointerType: PointerType.RsPointer\n})\n\nextern \"C\" const char * returnStringPointer() {\n char * str = new char[6];\n strcpy(str, \"hello\");\n return str;\n}\nconst stringPointer = load({\n library: \"libsum\",\n funcName: \"returnStringPointer\",\n retType: DataType.External,\n paramsType: [DataType.String],\n paramsValue: [\"hello\"],\n})\nfreePointer({\n paramsType: [DataType.External],\n paramsValue: [stringPointer],\n pointerType: PointerType.CPointer // will use libc::free to free the memory\n})\n```\n\n### Struct\n\nTo create a C struct or get a C struct as a return type, you need to define the types of the parameters strictly in the order in which the fields of the C structure are defined.\n\n`ffi-rs` provides a C struct named `Person` with many types of fields in [sum.cpp](./cpp/sum.cpp#L48)\n\nThe example call method about how to call a foreign function to create a `Person` struct or use `Person` struct as a return value is [here](./tests/struct.ts#L27)\n\n#### Use array in struct\n\nThere are two types of arrays in C language like `int* array` and `int array[100]` that have some different usages.\n\nThe first type `int* array` is a pointer type storing the first address of the array.\n\nThe second type `int array[100]` is a fixed-length array and each element in the array has a continuous address.\n\nIf you use an array as a function parameter, this usually passes an array pointer regardless of which type you define. But if the array type is defined in a struct, the two types of array definitions will cause different sizes and alignments of the struct.\n\nSo, `ffi-rs` needs to distinguish between the two types.\n\nBy default, `ffi-rs` uses dynamic arrays to calculate struct. If you confirm there is a static array, you can define it in this way:\n\n```c\ntypedef struct Person {\n //...\n uint8_t staticBytes[16];\n //...\n} Person;\n\n// use arrayConstructor and set ffiTypeTag field to DataType.StackArray\nstaticBytes: arrayConstructor({\n type: DataType.U8Array,\n length: parent.staticBytes.length,\n ffiTypeTag: FFITypeTag.StackArray\n}),\n```\n\n## Function\n\n`ffi-rs` supports passing JS function pointers to C functions, like this:\n\n```cpp\ntypedef const void (*FunctionPointer)(int a, bool b, char *c, double d,\n char **e, int *f, Person *g);\n\nextern \"C\" void callFunction(FunctionPointer func) {\n printf(\"callFunction\\n\");\n\n for (int i = 0; i < 2; i++) {\n int a = 100;\n bool b = false;\n double d = 100.11;\n char *c = (char *)malloc(14 * sizeof(char));\n strcpy(c, \"Hello, World!\");\n\n char **stringArray = (char **)malloc(sizeof(char *) * 2);\n stringArray[0] = strdup(\"Hello\");\n stringArray[1] = strdup(\"world\");\n\n int *i32Array = (int *)malloc(sizeof(int) * 3);\n i32Array[0] = 101;\n i32Array[1] = 202;\n i32Array[2] = 303;\n\n Person *p = createPerson();\n func(a, b, c, d, stringArray, i32Array, p);\n }\n}\n```\n\nCorresponding to the code above, you can use `ffi-rs` like this:\n\n```js\nconst testFunction = () => {\n const func = (a, b, c, d, e, f, g) => {\n equal(a, 100);\n equal(b, false);\n equal(c, \"Hello, World!\");\n equal(d, \"100.11\");\n deepStrictEqual(e, [\"Hello\", \"world\"]);\n deepStrictEqual(f, [101, 202, 303]);\n deepStrictEqual(g, person);\n logGreen(\"test function succeed\");\n // free function memory when it is not in use\n freePointer({\n paramsType: [funcConstructor({\n paramsType: [\n DataType.I32,\n DataType.Boolean,\n DataType.String,\n DataType.Double,\n arrayConstructor({\n type: DataType.StringArray,\n length: 2\n }),\n arrayConstructor({\n type: DataType.I32Array,\n length: 3\n }),\n personType,\n ],\n retType: DataType.Void,\n })],\n paramsValue: funcExternal\n })\n if (!process.env.MEMORY) {\n close(\"libsum\");\n }\n };\n // suggest using createPointer to create a function pointer for manual memory management\n const funcExternal = createPointer({\n paramsType: [funcConstructor({\n paramsType: [\n DataType.I32,\n DataType.Boolean,\n DataType.String,\n DataType.Double,\n arrayConstructor({\n type: DataType.StringArray,\n length: 2\n }),\n arrayConstructor({\n type: DataType.I32Array,\n length: 3\n }),\n personType,\n ],\n retType: DataType.Void,\n })],\n paramsValue: [func]\n })\n load({\n library: \"libsum\",\n funcName: \"callFunction\",\n retType: DataType.Void,\n paramsType: [\n DataType.External,\n ],\n paramsValue: unwrapPointer(funcExternal),\n });\n}\n```\n\nThe function parameters support all types in the example above.\n\nAttention: since the vast majority of scenarios developers pass JS functions to C as callbacks, `ffi-rs` will create [threadsafe_function](https://nodejs.org/api/n-api.html#napi_threadsafe_function) from JS functions which means the JS function will be called asynchronously, and the Node.js process will not exit automatically.\n\n## C++\n\nWe'll provide more examples from real-world scenarios. If you have any ideas, please submit an issue.\n\n### Class type\n\nIn C++ scenarios, we can use `DataType.External` to get a class type pointer.\n\nIn the code below, we use C types to wrap C++ types such as converting `char *` to `std::string` and returning a class pointer:\n\n```cpp\nMyClass *createMyClass(std::string name, int age) {\n return new MyClass(name, age);\n}\n\nextern \"C\" MyClass *createMyClassFromC(const char *name, int age) {\n return createMyClass(std::string(name), age);\n}\n\nextern \"C\" void printMyClass(MyClass *instance) { instance->print(); }\n```\n\nAnd then, it can be called by the following code:\n\n```js\nconst classPointer = load({\n library: \"libsum\",\n funcName: \"createMyClassFromC\",\n retType: DataType.External,\n paramsType: [\n DataType.String,\n DataType.I32\n ],\n paramsValue: [\"classString\", 26],\n});\nload({\n library: \"libsum\",\n funcName: \"printMyClass\",\n retType: DataType.External,\n paramsType: [\n DataType.External,\n ],\n paramsValue: [classPointer],\n})\nfreePointer({\n paramsType: [DataType.External],\n paramsValue: [classPointer],\n pointerType: PointerType.CPointer\n})\n```\n\n## errno\n\nBy default, `ffi-rs` will not output [errno](https://man7.org/linux/man-pages/man3/errno.3.html) info. Developers can get it by passing `errno: true` when calling the open method like:\n\n```js\nload({\n library: 'libnative',\n funcName: 'setsockopt',\n retType: DataType.I32,\n paramsType: [DataType.I32, DataType.I32, DataType.I32, DataType.External, DataType.I32],\n paramsValue: [socket._handle.fd, level, option, pointer[0], 4],\n errno: true // set errno as true\n})\n\n// The above code will return an object including three fields: errnoCode, errnoMessage, and the foreign function return value\n// { errnoCode: 22, errnoMessage: 'Invalid argument (os error 22)', value: -1 }\n```\n\n## Memory Management\n\nIt's important to free the memory allocations during a single ffi call to prevent memory leaks.\n\nWhat kinds of data memory are allocated in this?\n\n* Call parameters in the Rust environment which are allocated in the heap like `String`\n* Return value which in the C environment which are allocated in the heap like `char*`\n\nBy default, `ffi-rs` will free call parameters memory which are allocated in Rust.\n\nBut it will not free the return value from the C side since some C dynamic libraries will manage their memory automatically (when ffi-rs >= 1.0.79)\n\nThere are two ways to prevent `ffi-rs` from releasing memory:\n\n* Set `freeResultMemory: false` when calling `load` method, the default value is false\n\nIf you set freeResultMemory to false, `ffi-rs` will not release the return result memory which was allocated in the C environment\n\n* Use `DataType.External` as paramsType or retType\n\nIf developers use `DataType.External` as paramsType or retType, please use `freePointer` to release the memory of the pointer when this memory is no longer in use. ref [tests/index.ts](./tests/index.ts#L212)\n\n## runInNewThread\n\n`ffi-rs` supports running ffi tasks in a new thread without blocking the main thread, which is useful for CPU-intensive tasks.\n\nTo use this feature, you can pass the `runInNewThread` option to the load method:\n\n```js\nconst testRunInNewThread = async () => {\n // will return a promise but the task will run in a new thread\n load({\n library: \"libsum\",\n funcName: \"sum\",\n retType: DataType.I32,\n paramsType: [DataType.I32, DataType.I32],\n paramsValue: [1, 2],\n runInNewThread: true,\n }).then(res => {\n equal(res, 3)\n })\n}\n```\n","readmeFilename":"README.md"}