/
c_wrapper_linux.go
278 lines (224 loc) · 5.46 KB
/
c_wrapper_linux.go
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// -build windows
package utils
import (
"errors"
"fmt"
"io/ioutil"
"net/rpc"
"os"
"os/exec"
"time"
"unsafe"
mmap "github.com/edsrzf/mmap-go"
"github.com/kevinwallace/coprocess"
wineshm "github.com/leonb/wineshm-go"
)
var (
WineCmd = []string{"/opt/iracing/bin/wine", "--bottle", "default"}
)
const (
RPC_COMMAND = "utils/assets/ir-syscalls-rpc.exe"
DATA_CHANGE_TICK = time.Duration(time.Millisecond * 9)
)
type CWrapper struct {
sharedMem []byte
sharedMemPtr unsafe.Pointer
header *Header
hDataValidEvent uintptr
mmapFile *os.File
client *rpc.Client
}
func (cw *CWrapper) startup() error {
var err error
if cw.client == nil {
cw.client, err = newRpcClient()
if err != nil {
return err
}
}
if cw.mmapFile == nil {
cw.mmapFile, err = cw.getMmapFile()
if err != nil {
return err
}
}
if len(cw.sharedMem) == 0 {
cw.sharedMem, err = cw.getSharedMem()
if err != nil {
return err
}
}
if cw.sharedMemPtr == nil {
cw.sharedMemPtr, err = cw.getSharedMemPtr()
if err != nil {
return err
}
}
if cw.header == nil {
cw.header, err = cw.getHeader()
if err != nil {
return err
}
}
if cw.hDataValidEvent == 0 {
cw.hDataValidEvent, err = cw.OpenEvent(DATAVALIDEVENTNAME)
if err != nil {
return err
}
}
return nil
}
func (cw *CWrapper) shutdown() error {
if cw.client != nil {
cw.client.Close()
}
if cw.mmapFile != nil {
cw.mmapFile.Close()
}
// Clean linux specific vars
cw.client = nil
cw.mmapFile = nil
// Clean global vars
cw.sharedMemPtr = nil
cw.sharedMem = nil
cw.header = nil
return nil
}
func (cw *CWrapper) getMmapFile() (*os.File, error) {
var err error
wineshm.WineCmd = WineCmd
shmFd, err := wineshm.GetWineShm(MEMMAPFILENAME, wineshm.FILE_MAP_READ)
if err != nil {
return nil, err
}
file := os.NewFile(shmFd, MEMMAPFILENAME)
return file, err
}
func (cw *CWrapper) getSharedMem() ([]byte, error) {
sharedMem, err := mmap.Map(cw.mmapFile, mmap.RDONLY, 0)
if err != nil {
return nil, err
}
return sharedMem, nil
}
func (cw *CWrapper) getSharedMemPtr() (unsafe.Pointer, error) {
sharedMem, err := cw.getSharedMem()
if err != nil {
return nil, err
}
return unsafe.Pointer(&sharedMem[0]), nil
}
func (cw *CWrapper) WaitForDataChange(timeout time.Duration) error {
return cw.WaitForSingleObject(cw.hDataValidEvent, int(timeout/time.Millisecond))
// or use cw.WaitForDataChangeChannel()?
}
func (cw *CWrapper) WaitForDataChangeChannel(timeout time.Duration) error {
latest := cw.header.GetLatestVarBufN()
prevTickCount := cw.header.VarBuf[latest].TickCount
// Create a ticker and a stop channel
ticker := time.NewTicker(DATA_CHANGE_TICK)
defer ticker.Stop()
stop := make(chan bool)
// Check every tick if iRacing's tick has changed: when iRacing's tick has
// changed send a message on the stop channel to make the for loop stop
// @TODO: this is probably leaking goroutines
go func() {
for {
select {
case <-ticker.C:
// Check iRacing tick count
curTickCount := cw.header.VarBuf[latest].TickCount
if prevTickCount != curTickCount {
// tickcount changed: stop it
stop <- true
}
case <-stop:
ticker.Stop()
}
}
}()
// After timeout send a message on stop channel
time.AfterFunc(timeout, func() {
stop <- true
})
// Wait for stopchannel to receive a message
<-stop
return nil
}
// Syscalls
func (cw *CWrapper) CloseHandle(handle uintptr) error {
return nil
}
func (cw *CWrapper) UnmapViewOfFile(lpBaseAddress uintptr) error {
return nil
}
func (cw *CWrapper) OpenEvent(lpName string) (uintptr, error) {
var handle uintptr
args := &OpenEventArgs{lpName}
err := cw.client.Call("Commands.OpenEvent", args, &handle)
return handle, err
}
func (cw *CWrapper) WaitForSingleObject(hDataValidEvent uintptr, timeOut int) error {
retVal := new(int)
args := &WaitForSingleObjectArgs{hDataValidEvent, timeOut}
return cw.client.Call("Commands.WaitForSingleObject", args, &retVal)
}
func (cw *CWrapper) RegisterWindowMessageA(lpString string) (uint, error) {
return 0, nil
}
func (cw *CWrapper) RegisterWindowMessageW(lpString string) (uint, error) {
return 0, nil
}
func (cw *CWrapper) SendNotifyMessage(msgID uint, wParam uint32, lParam uint32) error {
return nil
}
func (cw *CWrapper) SendNotifyMessageW(msgID uint, wParam uint32, lParam uint32) error {
return nil
}
func NewCWrapper() (*CWrapper, error) {
client, err := newRpcClient()
if err != nil {
return nil, err
}
return &CWrapper{client: client}, nil
}
func newRpcClient() (*rpc.Client, error) {
rpcCommand, err := getRpcCommand()
// Remove the tmp file: if wine is running the rpc wrapper it's in memory
// and not needed anymore on disk
defer os.Remove(rpcCommand.Name())
if err != nil {
return nil, err
}
cmd := exec.Command(WineCmd[0], append(WineCmd[1:], rpcCommand.Name())...)
client, err := coprocess.NewClient(cmd)
if err != nil {
return nil, err
}
args := new(string)
*args = "ping"
ret := new(bool)
err = client.Call("Commands.Ping", args, ret)
if err != nil {
msg := fmt.Sprintf("Failed to execute rpc client (%v), make sure iRacing and ir-syscalls-rpc.exe are installed", err)
err = errors.New(msg)
return nil, err
}
return client, nil
}
func getRpcCommand() (*os.File, error) {
f, err := ioutil.TempFile("", "irsdk-go")
defer f.Close()
if err != nil {
return nil, err
}
data, err := Asset(RPC_COMMAND)
if err != nil {
return nil, err
}
_, err = f.Write(data)
if err != nil {
return nil, err
}
return f, nil
}