nim-ffi/examples/timer/go_bindings/my_timer.go

// Code generated by nim-ffi Go codegen. DO NOT EDIT.
package my_timer

/*
#cgo CFLAGS: -I${SRCDIR}
#cgo LDFLAGS: -L${SRCDIR} -lmy_timer -Wl,-rpath,${SRCDIR}
#include "my_timer.h"
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

extern void my_timerGoEvent(int ret, char* msg, size_t len, void* userData);

typedef struct {
  int ret; char* msg; size_t len; int done;
  pthread_mutex_t mu; pthread_cond_t cv;
} My_timerResp;

static My_timerResp* my_timerRespNew() {
  My_timerResp* r = (My_timerResp*)calloc(1, sizeof(My_timerResp));
  pthread_mutex_init(&r->mu, NULL); pthread_cond_init(&r->cv, NULL);
  return r;
}
static void my_timerRespFree(My_timerResp* r) {
  if (!r) return;
  if (r->msg) free(r->msg);
  pthread_mutex_destroy(&r->mu); pthread_cond_destroy(&r->cv); free(r);
}
static int my_timerRespRet(My_timerResp* r) { return r->ret; }
static char* my_timerRespMsg(My_timerResp* r) { return r->msg; }
static size_t my_timerRespLen(My_timerResp* r) { return r->len; }

static void my_timerRespCb(int ret, const char* msg, size_t len, void* ud) {
  My_timerResp* r = (My_timerResp*)ud;
  pthread_mutex_lock(&r->mu);
  r->ret = ret;
  // Native ABI: (msg, len) is the raw result (RET_OK) or error (RET_ERR).
  // Copy it so it survives past the callback.
  char* e = (char*)malloc(len + 1); if (e) { memcpy(e, msg, len); e[len] = 0; }
  r->msg = e; r->len = len;
  r->done = 1; pthread_cond_signal(&r->cv); pthread_mutex_unlock(&r->mu);
}
static void my_timerRespWait(My_timerResp* r) {
  pthread_mutex_lock(&r->mu);
  while (!r->done) pthread_cond_wait(&r->cv, &r->mu);
  pthread_mutex_unlock(&r->mu);
}

static void* my_timerCall_my_timer_create(TimerConfig config, My_timerResp* r) {
  void* ctx = my_timer_create(config, my_timerRespCb, r);
  my_timerRespWait(r);
  return ctx;
}
static int my_timerCall_my_timer_echo(void* ctx, EchoRequest req, My_timerResp* r) {
  int rc = my_timer_echo(ctx, my_timerRespCb, r, req);
  if (rc == RET_OK) my_timerRespWait(r);
  return rc;
}
static int my_timerCall_my_timer_version(void* ctx, My_timerResp* r) {
  int rc = my_timer_version(ctx, my_timerRespCb, r);
  if (rc == RET_OK) my_timerRespWait(r);
  return rc;
}
static int my_timerCall_my_timer_complex(void* ctx, ComplexRequest req, My_timerResp* r) {
  int rc = my_timer_complex(ctx, my_timerRespCb, r, req);
  if (rc == RET_OK) my_timerRespWait(r);
  return rc;
}
static int my_timerCall_my_timer_schedule(void* ctx, JobSpec job, RetryPolicy retry, ScheduleConfig schedule, My_timerResp* r) {
  int rc = my_timer_schedule(ctx, my_timerRespCb, r, job, retry, schedule);
  if (rc == RET_OK) my_timerRespWait(r);
  return rc;
}
static int my_timerCall_my_timer_destroy(void* ctx) { return my_timer_destroy(ctx); }
static uint64_t my_timerRegisterEvents(void* ctx) { return my_timer_add_event_listener(ctx, "", (FFICallBack)my_timerGoEvent, ctx); }
*/
import "C"

import (
	"errors"
	"sync"
	"unsafe"
)

// TimerConfig mirrors the {.ffi.} type of the same name.
type TimerConfig struct {
	Name string
}

// toC marshals TimerConfig into its C-POD form, returning cleanup funcs to run after the call.
func (v TimerConfig) toC() (C.TimerConfig, []func()) {
	var c C.TimerConfig
	var frees []func()
	cs_name := C.CString(v.Name)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_name)) })
	c.name = cs_name
	return c, frees
}

// EchoRequest mirrors the {.ffi.} type of the same name.
type EchoRequest struct {
	Message string
	DelayMs int64
}

// toC marshals EchoRequest into its C-POD form, returning cleanup funcs to run after the call.
func (v EchoRequest) toC() (C.EchoRequest, []func()) {
	var c C.EchoRequest
	var frees []func()
	cs_message := C.CString(v.Message)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_message)) })
	c.message = cs_message
	c.delayMs = C.int64_t(v.DelayMs)
	return c, frees
}

// EchoResponse mirrors the {.ffi.} type of the same name.
type EchoResponse struct {
	Echoed    string
	TimerName string
}

// toC marshals EchoResponse into its C-POD form, returning cleanup funcs to run after the call.
func (v EchoResponse) toC() (C.EchoResponse, []func()) {
	var c C.EchoResponse
	var frees []func()
	cs_echoed := C.CString(v.Echoed)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_echoed)) })
	c.echoed = cs_echoed
	cs_timerName := C.CString(v.TimerName)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_timerName)) })
	c.timerName = cs_timerName
	return c, frees
}

// ComplexRequest mirrors the {.ffi.} type of the same name.
type ComplexRequest struct {
	Messages []EchoRequest
	Tags     []string
	Note     *string
	Retries  *int64
}

// toC marshals ComplexRequest into its C-POD form, returning cleanup funcs to run after the call.
func (v ComplexRequest) toC() (C.ComplexRequest, []func()) {
	var c C.ComplexRequest
	var frees []func()
	if n_messages := len(v.Messages); n_messages > 0 {
		arr_messages := C.malloc(C.size_t(n_messages) * C.size_t(unsafe.Sizeof(C.EchoRequest{})))
		sl_messages := unsafe.Slice((*C.EchoRequest)(arr_messages), n_messages)
		for i := 0; i < n_messages; i++ {
			cf_messages_e, ff_messages_e := (v.Messages[i]).toC()
			frees = append(frees, ff_messages_e...)
			sl_messages[i] = cf_messages_e
		}
		c.messages = (*C.EchoRequest)(arr_messages)
		c.messages_len = C.size_t(n_messages)
		a_messages := arr_messages
		frees = append(frees, func() { C.free(a_messages) })
	}
	if n_tags := len(v.Tags); n_tags > 0 {
		arr_tags := C.malloc(C.size_t(n_tags) * C.size_t(unsafe.Sizeof((*C.char)(nil))))
		sl_tags := unsafe.Slice((**C.char)(arr_tags), n_tags)
		for i := 0; i < n_tags; i++ {
			cs_tags_e := C.CString(v.Tags[i])
			frees = append(frees, func() { C.free(unsafe.Pointer(cs_tags_e)) })
			sl_tags[i] = cs_tags_e
		}
		c.tags = (**C.char)(arr_tags)
		c.tags_len = C.size_t(n_tags)
		a_tags := arr_tags
		frees = append(frees, func() { C.free(a_tags) })
	}
	if v.Note != nil {
		c.note_present = 1
		cs_note_o := C.CString(*v.Note)
		frees = append(frees, func() { C.free(unsafe.Pointer(cs_note_o)) })
		c.note = cs_note_o
	}
	if v.Retries != nil {
		c.retries_present = 1
		c.retries = C.int64_t(*v.Retries)
	}
	return c, frees
}

// ComplexResponse mirrors the {.ffi.} type of the same name.
type ComplexResponse struct {
	Summary   string
	ItemCount int64
	HasNote   bool
}

// toC marshals ComplexResponse into its C-POD form, returning cleanup funcs to run after the call.
func (v ComplexResponse) toC() (C.ComplexResponse, []func()) {
	var c C.ComplexResponse
	var frees []func()
	cs_summary := C.CString(v.Summary)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_summary)) })
	c.summary = cs_summary
	c.itemCount = C.int64_t(v.ItemCount)
	if v.HasNote {
		c.hasNote = 1
	} else {
		c.hasNote = 0
	}
	return c, frees
}

// EchoEvent mirrors the {.ffi.} type of the same name.
type EchoEvent struct {
	Message   string
	EchoCount int64
}

// toC marshals EchoEvent into its C-POD form, returning cleanup funcs to run after the call.
func (v EchoEvent) toC() (C.EchoEvent, []func()) {
	var c C.EchoEvent
	var frees []func()
	cs_message := C.CString(v.Message)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_message)) })
	c.message = cs_message
	c.echoCount = C.int64_t(v.EchoCount)
	return c, frees
}

// JobSpec mirrors the {.ffi.} type of the same name.
type JobSpec struct {
	Name     string
	Payload  []string
	Priority int64
}

// toC marshals JobSpec into its C-POD form, returning cleanup funcs to run after the call.
func (v JobSpec) toC() (C.JobSpec, []func()) {
	var c C.JobSpec
	var frees []func()
	cs_name := C.CString(v.Name)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_name)) })
	c.name = cs_name
	if n_payload := len(v.Payload); n_payload > 0 {
		arr_payload := C.malloc(C.size_t(n_payload) * C.size_t(unsafe.Sizeof((*C.char)(nil))))
		sl_payload := unsafe.Slice((**C.char)(arr_payload), n_payload)
		for i := 0; i < n_payload; i++ {
			cs_payload_e := C.CString(v.Payload[i])
			frees = append(frees, func() { C.free(unsafe.Pointer(cs_payload_e)) })
			sl_payload[i] = cs_payload_e
		}
		c.payload = (**C.char)(arr_payload)
		c.payload_len = C.size_t(n_payload)
		a_payload := arr_payload
		frees = append(frees, func() { C.free(a_payload) })
	}
	c.priority = C.int64_t(v.Priority)
	return c, frees
}

// RetryPolicy mirrors the {.ffi.} type of the same name.
type RetryPolicy struct {
	MaxAttempts int64
	BackoffMs   int64
	RetryOn     []string
}

// toC marshals RetryPolicy into its C-POD form, returning cleanup funcs to run after the call.
func (v RetryPolicy) toC() (C.RetryPolicy, []func()) {
	var c C.RetryPolicy
	var frees []func()
	c.maxAttempts = C.int64_t(v.MaxAttempts)
	c.backoffMs = C.int64_t(v.BackoffMs)
	if n_retryOn := len(v.RetryOn); n_retryOn > 0 {
		arr_retryOn := C.malloc(C.size_t(n_retryOn) * C.size_t(unsafe.Sizeof((*C.char)(nil))))
		sl_retryOn := unsafe.Slice((**C.char)(arr_retryOn), n_retryOn)
		for i := 0; i < n_retryOn; i++ {
			cs_retryOn_e := C.CString(v.RetryOn[i])
			frees = append(frees, func() { C.free(unsafe.Pointer(cs_retryOn_e)) })
			sl_retryOn[i] = cs_retryOn_e
		}
		c.retryOn = (**C.char)(arr_retryOn)
		c.retryOn_len = C.size_t(n_retryOn)
		a_retryOn := arr_retryOn
		frees = append(frees, func() { C.free(a_retryOn) })
	}
	return c, frees
}

// ScheduleConfig mirrors the {.ffi.} type of the same name.
type ScheduleConfig struct {
	StartAtMs  int64
	IntervalMs int64
	Jitter     *int64
}

// toC marshals ScheduleConfig into its C-POD form, returning cleanup funcs to run after the call.
func (v ScheduleConfig) toC() (C.ScheduleConfig, []func()) {
	var c C.ScheduleConfig
	var frees []func()
	c.startAtMs = C.int64_t(v.StartAtMs)
	c.intervalMs = C.int64_t(v.IntervalMs)
	if v.Jitter != nil {
		c.jitter_present = 1
		c.jitter = C.int64_t(*v.Jitter)
	}
	return c, frees
}

// ScheduleResult mirrors the {.ffi.} type of the same name.
type ScheduleResult struct {
	JobId              string
	WillRunCount       int64
	FirstRunAtMs       int64
	EffectiveBackoffMs int64
}

// toC marshals ScheduleResult into its C-POD form, returning cleanup funcs to run after the call.
func (v ScheduleResult) toC() (C.ScheduleResult, []func()) {
	var c C.ScheduleResult
	var frees []func()
	cs_jobId := C.CString(v.JobId)
	frees = append(frees, func() { C.free(unsafe.Pointer(cs_jobId)) })
	c.jobId = cs_jobId
	c.willRunCount = C.int64_t(v.WillRunCount)
	c.firstRunAtMs = C.int64_t(v.FirstRunAtMs)
	c.effectiveBackoffMs = C.int64_t(v.EffectiveBackoffMs)
	return c, frees
}

type My_timerNode struct {
	ctx unsafe.Pointer
}

// goStr extracts and frees the captured response string.
func respStr(r *C.My_timerResp) string {
	return C.GoStringN(C.my_timerRespMsg(r), C.int(C.my_timerRespLen(r)))
}

var (
	eventMu      sync.Mutex
	eventHandler func(string)
)

// SetEventHandler installs the catch-all handler for library-initiated
// events (delivered as raw JSON strings).
func (n *My_timerNode) SetEventHandler(h func(string)) {
	eventMu.Lock()
	eventHandler = h
	eventMu.Unlock()
	C.my_timerRegisterEvents(n.ctx)
}

//export my_timerGoEvent
func my_timerGoEvent(ret C.int, msg *C.char, length C.size_t, userData unsafe.Pointer) {
	eventMu.Lock()
	h := eventHandler
	eventMu.Unlock()
	if h != nil && ret == C.RET_OK {
		h(C.GoStringN(msg, C.int(length)))
	}
}

func NewMy_timer(config TimerConfig) (*My_timerNode, error) {
	c_config, free_config := config.toC()
	defer func() {
		for _, f := range free_config {
			f()
		}
	}()
	r := C.my_timerRespNew()
	defer C.my_timerRespFree(r)
	ctx := C.my_timerCall_my_timer_create(c_config, r)
	if C.my_timerRespRet(r) != C.RET_OK {
		return nil, errors.New(respStr(r))
	}
	return &My_timerNode{ctx: ctx}, nil
}

func (n *My_timerNode) Echo(req EchoRequest) (string, error) {
	c_req, free_req := req.toC()
	defer func() {
		for _, f := range free_req {
			f()
		}
	}()
	r := C.my_timerRespNew()
	defer C.my_timerRespFree(r)
	C.my_timerCall_my_timer_echo(n.ctx, c_req, r)
	if C.my_timerRespRet(r) != C.RET_OK {
		return "", errors.New(respStr(r))
	}
	return respStr(r), nil
}

func (n *My_timerNode) Version() (string, error) {
	r := C.my_timerRespNew()
	defer C.my_timerRespFree(r)
	C.my_timerCall_my_timer_version(n.ctx, r)
	if C.my_timerRespRet(r) != C.RET_OK {
		return "", errors.New(respStr(r))
	}
	return respStr(r), nil
}

func (n *My_timerNode) Complex(req ComplexRequest) (string, error) {
	c_req, free_req := req.toC()
	defer func() {
		for _, f := range free_req {
			f()
		}
	}()
	r := C.my_timerRespNew()
	defer C.my_timerRespFree(r)
	C.my_timerCall_my_timer_complex(n.ctx, c_req, r)
	if C.my_timerRespRet(r) != C.RET_OK {
		return "", errors.New(respStr(r))
	}
	return respStr(r), nil
}

func (n *My_timerNode) Schedule(job JobSpec, retry RetryPolicy, schedule ScheduleConfig) (string, error) {
	c_job, free_job := job.toC()
	defer func() {
		for _, f := range free_job {
			f()
		}
	}()
	c_retry, free_retry := retry.toC()
	defer func() {
		for _, f := range free_retry {
			f()
		}
	}()
	c_schedule, free_schedule := schedule.toC()
	defer func() {
		for _, f := range free_schedule {
			f()
		}
	}()
	r := C.my_timerRespNew()
	defer C.my_timerRespFree(r)
	C.my_timerCall_my_timer_schedule(n.ctx, c_job, c_retry, c_schedule, r)
	if C.my_timerRespRet(r) != C.RET_OK {
		return "", errors.New(respStr(r))
	}
	return respStr(r), nil
}

func (n *My_timerNode) Destroy() error {
	if C.my_timerCall_my_timer_destroy(n.ctx) != C.RET_OK {
		return errors.New("my_timer destroy failed")
	}
	return nil
}