Python調用go function

Python code foo.py

from ctypes import *
from ctypes import cdll
import time

class go_string(Structure):
    _fields_ = [
        ("p", c_char_p),
        ("n", c_int)]

lib = cdll.LoadLibrary('/var/tmp/foo.so')

def bar(str):
    b = go_string(c_char_p(bytes(str, "utf-8")), len(str))
    lib.bar.restype = c_char_p
    a = lib.bar(b, c_char_p(bytes(str, "utf-8")))
    print(a)

bar("haha")
bar("hoho")
time.sleep(100)

Go code foo.go

package main

import (
    "C"
    "fmt"
    "time"
)

//export bar
func bar(a string, b *C.char) *C.char {
    c := a
    d := C.GoString(b)
    go func() {
        for {
            time.Sleep(time.Second)
            fmt.Println("a:", a)
            fmt.Println("b:", C.GoString(b))
            fmt.Println("c:", c)
            fmt.Println("d:", d)
        }
    }()
    return C.CString("hello from go")
}

func main() {}

編譯go

go build -buildmode=c-shared -o foo.so foo.go

編譯生成的foo.h

/* Code generated by cmd/cgo; DO NOT EDIT. */

/* package command-line-arguments */


#line 1 "cgo-builtin-prolog"

#include <stddef.h> /* for ptrdiff_t below */

#ifndef GO_CGO_EXPORT_PROLOGUE_H
#define GO_CGO_EXPORT_PROLOGUE_H

typedef struct { const char *p; ptrdiff_t n; } _GoString_;

#endif

/* Start of preamble from import "C" comments.  */




/* End of preamble from import "C" comments.  */


/* Start of boilerplate cgo prologue.  */
#line 1 "cgo-gcc-export-header-prolog"

#ifndef GO_CGO_PROLOGUE_H
#define GO_CGO_PROLOGUE_H

typedef signed char GoInt8;
typedef unsigned char GoUint8;
typedef short GoInt16;
typedef unsigned short GoUint16;
typedef int GoInt32;
typedef unsigned int GoUint32;
typedef long long GoInt64;
typedef unsigned long long GoUint64;
typedef GoInt64 GoInt;
typedef GoUint64 GoUint;
typedef __SIZE_TYPE__ GoUintptr;
typedef float GoFloat32;
typedef double GoFloat64;
typedef float _Complex GoComplex64;
typedef double _Complex GoComplex128;

/*
  static assertion to make sure the file is being used on architecture
  at least with matching size of GoInt.
*/
typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];

typedef _GoString_ GoString;
typedef void *GoMap;
typedef void *GoChan;
typedef struct { void *t; void *v; } GoInterface;
typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;

#endif

/* End of boilerplate cgo prologue.  */

#ifdef __cplusplus
extern "C" {
#endif


extern char* bar(GoString p0, char* p1);

#ifdef __cplusplus
}
#endif

運行

Reference

• https://gist.github.com/helinwang/4f287a52efa4ab75424c01c65d77d939