void StartSession(const std::string& shmName, PlatformPtr platform, IpcMessageQueuePtr hostQueue){
for(auto& plugin : plugins){
try {
std::string messageQueueName = UuidGenerator::Create()->GenerateUuid(RandChar::Create());
FlogExpD(messageQueueName);
plugin.messageQueue = IpcMessageQueue::Create(messageQueueName, 2, 1024 * 1024 * 32, 4, 1024 * 16);
plugin.process = platform->StartProcess(plugin.executable, {messageQueueName, shmName}, plugin.directory);
plugin.started = true;
SendArguments(plugin);
} catch (PlatformEx e) {
FlogE("could not start plugin: " << plugin.executable << " because: " << e.GetMsg());
plugin.started = false;
hostQueue->WriteMessage(Str("error -1 " << plugin.name), "could not start process");
}
}
}
DEF_TEST(IpcMessageQueue, SendRecvMessage)
{
try {
IpcMessageQueuePtr host = IpcMessageQueue::Create("utest");
IpcMessageQueuePtr client = IpcMessageQueue::Open("utest");
bool ret = host->WriteMessage("test", "hello");
TEST_ASSERT(ret, "unexpected timeout when writing message");
std::string type, msg;
ret = client->ReadMessage(type, msg);
TEST_ASSERT(ret, "unexpected timeout when reading message");
TEST_ASSERT(type == "test", "unexpected type, expected 'test' but got: '" << type << "'");
TEST_ASSERT(msg == "hello", "unexpected message contents, expected 'hello' but got: '" << msg << "'");
} catch (IpcEx ex) {
TEST_EX("IpcEx, " << ex.GetMsg());
}
}
void ProcessMessages(PlatformPtr platform, IpcMessageQueuePtr hostQueue, bool waitReady, int timeout){
for(auto& plugin : plugins){
if(!plugin.started)
continue;
bool done = false;
while(!done){
bool ret = false;
bool isRunning = true; // = false;
const int period = 100;
int deadSincePeriods = 0;
for(int i = 0; i < timeout / period; i++){
if(i > period * 10)
FlogW("waiting for slow plugin: " << plugin.executable);
ret = plugin.messageQueue->GetReadBuffer([&](const std::string& type, const char* buffer, size_t size){
if(Tools::StartsWith(type, "results")){
// results message, relay to host
FlogD("relaying results from: " << plugin.executable);
if(hostQueue->GetWriteQueueSize() >= (int)size){
char* outBuffer = hostQueue->GetWriteBuffer();
memcpy(outBuffer, buffer, size);
hostQueue->ReturnWriteBuffer(Str(type << " " << plugin.name), &outBuffer, size);
}else{
hostQueue->WriteMessage(Str("error 0 " << plugin.name), "result too big for frameserver/host message queue");
FlogW("result too big for frameserver/host message queue, plugin: " << plugin.executable << " " << plugin.name);
}
if(!waitReady)
done = true;
}
else if(type == "status"){
// plugin is ready for next frame
// TODO actually check if the message says "ready"
if(waitReady)
done = true;
}
else if(Tools::StartsWith(type, "error")){
// error
FlogD("relaying error from: " << plugin.executable);
done = true;
plugin.started = false;
hostQueue->WriteMessage(Str(type << " " << plugin.name), buffer);
}
else{
// unknown
FlogW("unknown message type: " << type << " from plugin: " << plugin.name);
done = true;
plugin.started = false;
}
}, period);
// The deadSincePeriods counter exists to prevent a race condition where the frameserver queue read times out
// because the plugin has acquired a buffer for writing a result. If the plugin then manages to terminate
// before the process->IsRunning check in the frameserver, the reported result (or other message) would be ignored.
// If the process has been dead the last 10 periods (1 is probably enough) we can safely assume that there are no
// result messages in the queue waiting for us, and since the plugin process is dead, we can exit the loop.
deadSincePeriods += plugin.process->IsRunning() ? 0 : 1;
isRunning = deadSincePeriods < 10;
if(ret || !isRunning)
break;
}
if(!isRunning){
// process exited
hostQueue->WriteMessage(Str("error 0 " << plugin.name), "process exited");
FlogW("process exited, plugin: " << plugin.executable << " " << plugin.name);
plugin.started = false;
break;
}
else if(!ret){
// timeout occured
hostQueue->WriteMessage(Str("error 0 " << plugin.name), "timeout while processing frames");
FlogW("timeout, plugin: " << plugin.executable << " " << plugin.name);
plugin.started = false;
break;
}
}
}
}