├── .gitignore ├── Makefile ├── README.md ├── lib ├── Cargo.lock ├── Cargo.toml ├── build.rs ├── cbindgen.toml ├── hyper.h ├── libhyper.so └── src │ └── lib.rs └── main.go /.gitignore: -------------------------------------------------------------------------------- 1 | lib/target/ 2 | main 3 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | ROOT_DIR := $(dir $(realpath $(lastword $(MAKEFILE_LIST)))) 2 | 3 | .PHONY: clear build run 4 | 5 | clear: 6 | rm -rf lib/target 7 | rm -f lib/libhyper.so 8 | rm -f lib/hyper.h 9 | 10 | build: 11 | clear 12 | cd lib/ && cargo build --release 13 | cp lib/target/release/libhyper.so lib/ 14 | go build -ldflags="-r $(ROOT_DIR)lib" main.go 15 | 16 | run: clear build 17 | ./main 18 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Golang调用Rust代码 2 | 3 | 将rust中组合子示例函数封装成动态库，并在golang中调用 4 | 5 | ## 1 Rust 生成c语言头文件和动态库 6 | 7 | 为 Rust 库编写[FFI](https://doc.rust-lang.org/nomicon/ffi.html)(Foreign Function Interface) 8 | 9 | ### 包装Rust库 10 | 11 | 由于rust类型无法直接导出成c语言识别的数据类型, 因此需要将数据类型和函数声明重新包装 12 | 13 | ```Rust 14 | #[repr(C)] 15 | pub struct PairStr{ 16 | left : *const c_char, 17 | right : *const c_char, 18 | } 19 | 20 | #[no_mangle] 21 | pub extern fn space_find_export(input: *const c_char) -> PairStr { 22 | 23 | } 24 | ``` 25 | 26 | ### 使用cbindgen自动导出h文件 27 | 28 | 使用[cbindgen](https://github.com/eqrion/cbindgen)工具根据rust代码自动生成c语言头文件 29 | > cbindgen has a simple but effective strategy. It walks through your crate looking for: 30 | 1、#[no_mangle] pub extern fn ("functions") 31 | 2、#[no_mangle] pub static ("globals") 32 | 3、pub const ("constants") 33 | 34 | ### 使用步骤 35 | 36 | 1. yum install clang 37 | 2. cargo install --force cbindgen 38 | 3. 在Cargo.toml中添加依赖 39 | 40 | ```shell 41 | [build-dependencies] 42 | cbindgen = "0.12.2" 43 | ``` 44 | 45 | 4. 在项目中添加cbindgen.toml文件 46 | 47 | ```shell 48 | include_guard = "HYPER_H" 49 | autogen_warning = "/* Warning, this file is autogenerated by cbindgen. Don't modify this manually. */" 50 | language = "C" 51 | ``` 52 | 53 | 5. 添加build.rs脚本，用于生成c语言头文件hyper.h, 执行cargo build命令，Rust的OUT_DIR将会包含hyper.h 54 | 55 | ## 2 Go 调用 C 56 | 57 | go语言自带[cgo](https://chai2010.cn/advanced-go-programming-book/ch2-cgo/readme.html)工具支持c语言的函数调用，但需要安装gcc，并且开启CGO_ENABLED 58 | 在go的源代码中把C代码作为注释来写，并标明依赖的库文件和路径，最后使用import "C" 59 | 60 | ```golang 61 | import "C" 62 | /* 63 | #cgo LDFLAGS: -L./lib -lhyper 64 | #include "./lib/hyper.h" 65 | */ 66 | func main() { 67 | C.space_find_export(C.CString("hello world")) 68 | } 69 | ``` 70 | 71 | ## 3 运行 72 | 73 | 编译rust程序 + 生成c头文件和动态库 + 编译运行go程序 74 | 75 | ```shell 76 | make run 77 | ``` 78 | 79 | ## 注意事项 80 | 81 | 1. 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[build-dependencies] 12 | cbindgen = "0.12.2" 13 | 14 | [dependencies] 15 | nom = "5" 16 | toml = "0.5.5" -------------------------------------------------------------------------------- /lib/build.rs: -------------------------------------------------------------------------------- 1 | use std::env; 2 | 3 | fn main() { 4 | let crate_dir = env::var("CARGO_MANIFEST_DIR") 5 | .expect("CARGO_MANIFEST_DIR env var is not defined"); 6 | let config = cbindgen::Config::from_file("cbindgen.toml") 7 | .expect("Unable to find cbindgen.toml configuration file"); 8 | cbindgen::generate_with_config(&crate_dir, config) 9 | .unwrap() 10 | .write_to_file("./hyper.h"); 11 | } -------------------------------------------------------------------------------- /lib/cbindgen.toml: -------------------------------------------------------------------------------- 1 | include_guard = "HYPER_H" 2 | autogen_warning = "/* Warning, this file is autogenerated by cbindgen. Don't modify this manually. */" 3 | language = "C" -------------------------------------------------------------------------------- /lib/hyper.h: -------------------------------------------------------------------------------- 1 | #ifndef HYPER_H 2 | #define HYPER_H 3 | 4 | /* Warning, this file is autogenerated by cbindgen. Don't modify this manually. */ 5 | 6 | #include 7 | #include 8 | #include 9 | #include 10 | 11 | typedef struct { 12 | const char *left; 13 | const char *right; 14 | } PairStr; 15 | 16 | PairStr space_find_export(const char *input); 17 | 18 | #endif /* HYPER_H */ 19 | -------------------------------------------------------------------------------- /lib/libhyper.so: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/loloxiaoz/rust-cgo/4f5bda4a1b4122d8cf461fc22fb416510c70b491/lib/libhyper.so -------------------------------------------------------------------------------- /lib/src/lib.rs: -------------------------------------------------------------------------------- 1 | extern crate nom; 2 | use nom::{ 3 | bytes::complete::{is_not}, 4 | combinator::{opt}, 5 | IResult, 6 | }; 7 | use std::os::raw::c_char; 8 | use std::ffi::{CString, CStr}; 9 | 10 | #[repr(C)] 11 | pub struct PairStr{ 12 | left : *const c_char, 13 | right : *const c_char, 14 | } 15 | 16 | pub fn space_find(input: &str) -> IResult<&str, &str> { 17 | let (char, found) = opt(is_not(" "))(input)?; 18 | if let Some(left) = found { 19 | return Ok((char.trim(), left)); 20 | } 21 | Ok((input, "")) 22 | } 23 | 24 | #[no_mangle] 25 | pub extern fn space_find_export(input: *const c_char) -> PairStr { 26 | unsafe { 27 | let input_str: &str= CStr::from_ptr(input).to_str().unwrap(); 28 | let (x, y) = space_find(input_str).unwrap(); 29 | PairStr{ 30 | left : CString::new(x).unwrap().into_raw(), 31 | right : CString::new(y).unwrap().into_raw(), 32 | } 33 | } 34 | } 35 | 36 | 37 | #[cfg(test)] 38 | mod tests { 39 | use super::*; 40 | 41 | #[test] 42 | fn test_space_find() { 43 | let input_str = b"hello world\0"; 44 | let input: *const c_char = input_str.as_ptr() as *const c_char; 45 | let ret = space_find_export(input); 46 | unsafe { 47 | assert_eq!(CStr::from_ptr(ret.left).to_str().unwrap(), "world"); 48 | assert_eq!(CStr::from_ptr(ret.right).to_str().unwrap(), "hello"); 49 | } 50 | } 51 | } 52 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | /* 4 | #cgo LDFLAGS: -L./lib -lhyper 5 | #include "./lib/hyper.h" 6 | */ 7 | import "C" 8 | 9 | import ( 10 | "fmt" 11 | ) 12 | 13 | func main() { 14 | ret := C.space_find_export(C.CString("hello world")) 15 | fmt.Println(C.GoString(ret.left)) 16 | fmt.Println(C.GoString(ret.right)) 17 | } 18 | --------------------------------------------------------------------------------