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#include "module.h"
#include "async_commands.h"
static bool ignore_pre_command = false;
static Pipe *me;
static CommandMutex *current_command = NULL;
static std::list<CommandMutex *> commands;
/* Mutex held by the core when it is processing. Used by threads to halt the core */
static Mutex main_mutex;
class AsynchCommandMutex : public CommandMutex
{
public:
bool destroy;
bool started;
AsynchCommandMutex(CommandSource &s, Command *c, const std::vector<Anope::string> &p) : CommandMutex(s, c, p), destroy(false), started(false)
{
commands.push_back(this);
this->mutex.Lock();
}
~AsynchCommandMutex()
{
std::list<CommandMutex *>::iterator it = std::find(commands.begin(), commands.end(), this);
if (it != commands.end())
commands.erase(it);
if (this == current_command)
current_command = NULL;
}
void Run()
{
this->started = true;
User *u = this->source.u;
BotInfo *bi = this->source.owner;
ignore_pre_command = true;
EventReturn MOD_RESULT;
FOREACH_RESULT(I_OnPreCommand, OnPreCommand(source, command, params));
if (MOD_RESULT == EVENT_STOP)
{
source.DoReply();
return;
}
if (!this->source.permission.empty() && !u->HasCommand(this->source.permission))
{
u->SendMessage(bi, ACCESS_DENIED);
Log(LOG_COMMAND, "denied", bi) << "Access denied for user " << u->GetMask() << " with command " << command;
}
else
{
command->Execute(source, params);
FOREACH_MOD(I_OnPostCommand, OnPostCommand(source, command, params));
source.DoReply();
}
main_mutex.Unlock();
}
void Lock()
{
if (this->destroy)
this->Exit();
this->processing = true;
me->Notify();
this->mutex.Lock();
if (this->destroy)
{
this->Unlock();
this->Exit();
}
}
void Unlock()
{
this->processing = false;
main_mutex.Unlock();
}
void Destroy()
{
this->destroy = true;
}
};
class ModuleAsynchCommands : public Module, public Pipe, public AsynchCommandsService
{
bool reset;
void Reset()
{
this->reset = false;
unsigned count = 0, size = commands.size();
for (std::list<CommandMutex *>::iterator it = commands.begin(); count < size; ++count, ++it)
{
AsynchCommandMutex *cm = debug_cast<AsynchCommandMutex *>(*it);
cm->Destroy();
new AsynchCommandMutex(cm->source, cm->command, cm->params);
}
}
public:
ModuleAsynchCommands(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, SUPPORTED), Pipe(), AsynchCommandsService(this, "asynch_commands"), reset(false)
{
me = this;
this->SetPermanent(true);
main_mutex.Lock();
Implementation i[] = { I_OnDeleteObject, I_OnPreCommand };
ModuleManager::Attach(i, this, sizeof(i) / sizeof(Implementation));
ModuleManager::SetPriority(this, PRIORITY_FIRST);
ModuleManager::RegisterService(this);
}
void OnDeleteObject(Base *b)
{
for (std::list<CommandMutex *>::iterator it = commands.begin(), it_end = commands.end(); it != it_end; ++it)
{
AsynchCommandMutex *cm = debug_cast<AsynchCommandMutex *>(*it);
if (cm->started && (cm->command == b || cm->source.u == b || cm->source.owner == b || cm->source.service == b))
cm->Destroy();
}
this->reset = true;
}
EventReturn OnPreCommand(CommandSource &source, Command *command, std::vector<Anope::string> ¶ms)
{
if (ignore_pre_command)
{
ignore_pre_command = false;
return EVENT_CONTINUE;
}
else if (current_command)
return EVENT_CONTINUE;
else if (command->name == "RESTART")
return EVENT_CONTINUE;
CommandSource source_copy = source;
AsynchCommandMutex *cm = new AsynchCommandMutex(source_copy, command, params);
try
{
// Give processing to the command thread
Log(LOG_DEBUG_2) << "Waiting for command thread " << cm->command->name << " from " << source_copy.u->nick;
current_command = cm;
threadEngine.Start(cm);
main_mutex.Lock();
current_command = NULL;
return EVENT_STOP;
}
catch (const CoreException &ex)
{
delete cm;
Log() << "Unable to thread for command: " << ex.GetReason();
}
return EVENT_CONTINUE;
}
void OnNotify()
{
for (std::list<CommandMutex *>::iterator it = commands.begin(), it_end = commands.end(); it != it_end;)
{
AsynchCommandMutex *cm = debug_cast<AsynchCommandMutex *>(*it++);
// Thread engine will pick this up later
if (cm->GetExitState() || !cm->processing)
continue;
else if (cm->destroy)
{
if (cm->started)
{
cm->mutex.Unlock();
continue;
}
else
delete cm;
}
if (this->reset)
{
this->Reset();
return this->OnNotify();
}
Log(LOG_DEBUG_2) << "Waiting for command thread " << cm->command->name << " from " << cm->source.u->nick;
current_command = cm;
// Unlock to give processing back to the command thread
if (!cm->started)
{
try
{
threadEngine.Start(cm);
}
catch (const CoreException &)
{
delete cm;
continue;
}
}
else
cm->mutex.Unlock();
// Relock to regain processing once the command thread hangs for any reason
main_mutex.Lock();
current_command = NULL;
}
}
CommandMutex *CurrentCommand()
{
return current_command;
}
};
MODULE_INIT(ModuleAsynchCommands)
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