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panda3d/direct/src/distributed/cConnectionRepository.cxx
David Rose edf017e3f6 support multiple inheritance in dc file
2005-02-25 23:32:34 +00:00

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// Filename: cConnectionRepository.cxx
// Created by: drose (17May04)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license. You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////
#include "cConnectionRepository.h"
#include "dcmsgtypes.h"
#include "dcClass.h"
#include "dcPacker.h"
#include "config_distributed.h"
#include "httpChannel.h"
#include "urlSpec.h"
#include "datagramIterator.h"
#include "throw_event.h"
#include "pStatTimer.h"
const string CConnectionRepository::_overflow_event_name = "CRDatagramOverflow";
#ifndef CPPPARSER
PStatCollector CConnectionRepository::_update_pcollector("App:Show code:readerPollTask:Update");
#endif // CPPPARSER
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::Constructor
// Access: Published
// Description:
////////////////////////////////////////////////////////////////////
CConnectionRepository::
CConnectionRepository() :
#ifdef HAVE_PYTHON
_python_repository(NULL),
#endif
#ifdef HAVE_SSL
_http_conn(NULL),
#endif
#ifdef HAVE_NSPR
_cw(&_qcm, 0),
_qcr(&_qcm, 0),
#endif
_client_datagram(true),
_simulated_disconnect(false),
_verbose(distributed_cat.is_spam()),
_msg_channel(0),
_msg_sender(0),
_sec_code(0),
_msg_type(0)
{
#if defined(HAVE_NSPR) && defined(SIMULATE_NETWORK_DELAY)
if (min_lag != 0.0 || max_lag != 0.0) {
_qcr.start_delay(min_lag, max_lag);
}
#endif
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::Destructor
// Access: Published
// Description:
////////////////////////////////////////////////////////////////////
CConnectionRepository::
~CConnectionRepository() {
disconnect();
}
#ifdef HAVE_SSL
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::set_connection_http
// Access: Published
// Description: Once a connection has been established via the HTTP
// interface, gets the connection and uses it. The
// supplied HTTPChannel object must have a connection
// available via get_connection().
////////////////////////////////////////////////////////////////////
void CConnectionRepository::
set_connection_http(HTTPChannel *channel) {
disconnect();
nassertv(channel->is_connection_ready());
_http_conn = channel->get_connection();
}
#endif // HAVE_SSL
#ifdef HAVE_NSPR
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::try_connect_nspr
// Access: Published
// Description: Uses NSPR to try to connect to the server and port
// named in the indicated URL. Returns true if
// successful, false otherwise.
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
try_connect_nspr(const URLSpec &url) {
disconnect();
_nspr_conn =
_qcm.open_TCP_client_connection(url.get_server(), url.get_port(),
game_server_timeout_ms);
if (_nspr_conn != (Connection *)NULL) {
_nspr_conn->set_no_delay(true);
_qcr.add_connection(_nspr_conn);
return true;
}
return false;
}
#endif // HAVE_NSPR
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::check_datagram
// Access: Published
// Description: Returns true if a new datagram is available, false
// otherwise. If the return value is true, the new
// datagram may be retrieved via get_datagram(), or
// preferably, with get_datagram_iterator() and
// get_msg_type().
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
check_datagram() {
if (_simulated_disconnect) {
return false;
}
while (do_check_datagram()) {
#ifndef NDEBUG
if (get_verbose()) {
describe_message(nout, "receive ", _dg.get_message());
}
#endif // NDEBUG
// Start breaking apart the datagram.
_di = DatagramIterator(_dg);
if (!_client_datagram) {
_msg_channel = _di.get_uint64();
_msg_sender = _di.get_uint64();
_sec_code = _di.get_uint8();
#ifdef HAVE_PYTHON
// For now, we need to stuff this field onto the Python
// structure, to support legacy code that expects to find it
// there.
if (_python_repository != (PyObject *)NULL) {
PyObject *value = PyLong_FromUnsignedLongLong(_msg_sender);
PyObject_SetAttrString(_python_repository, "msgSender", value);
Py_DECREF(value);
}
#endif // HAVE_PYTHON
}
_msg_type = _di.get_uint16();
// Is this a message that we can process directly?
switch (_msg_type) {
#ifdef HAVE_PYTHON
case CLIENT_OBJECT_UPDATE_FIELD:
case STATESERVER_OBJECT_UPDATE_FIELD:
if (!handle_update_field()) {
return false;
}
break;
#endif // HAVE_PYTHON
default:
// Some unknown message; let the caller deal with it.
return true;
}
}
// No datagrams available.
return false;
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::is_connected
// Access: Published
// Description: Returns true if the connection to the gameserver is
// established and still good, false if we are not
// connected. A false value means either (a) we never
// successfully connected, (b) we explicitly called
// disconnect(), or (c) we were connected, but the
// connection was spontaneously lost.
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
is_connected() {
#ifdef HAVE_NSPR
if (_nspr_conn) {
if (_qcm.reset_connection_available()) {
PT(Connection) reset_connection;
if (_qcm.get_reset_connection(reset_connection)) {
_qcm.close_connection(reset_connection);
if (reset_connection == _nspr_conn) {
// Whoops, lost our connection.
_nspr_conn = NULL;
return false;
}
}
}
return true;
}
#endif // HAVE_NSPR
#ifdef HAVE_SSL
if (_http_conn) {
if (!_http_conn->is_closed()) {
return true;
}
// Connection lost.
delete _http_conn;
_http_conn = NULL;
}
#endif // HAVE_SSL
return false;
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::send_datagram
// Access: Published
// Description: Queues the indicated datagram for sending to the
// server. It may not get send immediately if
// collect_tcp is in effect; call flush() to guarantee
// it is sent now.
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
send_datagram(const Datagram &dg) {
if (_simulated_disconnect) {
distributed_cat.warning()
<< "Unable to send datagram during simulated disconnect.\n";
return false;
}
#ifndef NDEBUG
if (get_verbose()) {
describe_message(nout, "send ", dg.get_message());
}
#endif // NDEBUG
#ifdef HAVE_NSPR
if (_nspr_conn) {
_cw.send(dg, _nspr_conn);
return true;
}
#endif // HAVE_NSPR
#ifdef HAVE_SSL
if (_http_conn) {
if (!_http_conn->send_datagram(dg)) {
distributed_cat.warning()
<< "Could not send datagram.\n";
return false;
}
return true;
}
#endif // HAVE_SSL
distributed_cat.warning()
<< "Unable to send datagram after connection is closed.\n";
return false;
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::consider_flush
// Access: Published
// Description: Sends the most recently queued data if enough time
// has elapsed. This only has meaning if
// set_collect_tcp() has been set to true.
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
consider_flush() {
if (_simulated_disconnect) {
return false;
}
#ifdef HAVE_NSPR
if (_nspr_conn) {
return _nspr_conn->consider_flush();
}
#endif // HAVE_NSPR
#ifdef HAVE_SSL
if (_http_conn) {
return _http_conn->consider_flush();
}
#endif // HAVE_SSL
return false;
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::flush
// Access: Published
// Description: Sends the most recently queued data now. This only
// has meaning if set_collect_tcp() has been set to
// true.
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
flush() {
if (_simulated_disconnect) {
return false;
}
#ifdef HAVE_NSPR
if (_nspr_conn) {
return _nspr_conn->flush();
}
#endif // HAVE_NSPR
#ifdef HAVE_SSL
if (_http_conn) {
return _http_conn->flush();
}
#endif // HAVE_SSL
return false;
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::disconnect
// Access: Published
// Description: Closes the connection to the server.
////////////////////////////////////////////////////////////////////
void CConnectionRepository::
disconnect() {
#ifdef HAVE_NSPR
if (_nspr_conn) {
_qcm.close_connection(_nspr_conn);
_nspr_conn = NULL;
}
#endif // HAVE_NSPR
#ifdef HAVE_SSL
if (_http_conn) {
_http_conn->close();
delete _http_conn;
_http_conn = NULL;
}
#endif // HAVE_SSL
_simulated_disconnect = false;
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::do_check_datagram
// Access: Private
// Description: The private implementation of check_datagram(), this
// gets one datagram if it is available.
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
do_check_datagram() {
#ifdef HAVE_NSPR
if (_nspr_conn) {
_nspr_conn->consider_flush();
if (_qcr.get_overflow_flag()) {
throw_event(get_overflow_event_name());
_qcr.reset_overflow_flag();
}
return (_qcr.data_available() && _qcr.get_data(_dg));
}
#endif // HAVE_NSPR
#ifdef HAVE_SSL
if (_http_conn) {
_http_conn->consider_flush();
return _http_conn->receive_datagram(_dg);
}
#endif // HAVE_SSL
return false;
}
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::handle_update_field
// Access: Private
// Description: Directly handles an update message on a field.
// Python never touches the datagram; it just gets its
// distributed method called with the appropriate
// parameters. Returns true if everything is ok, false
// if there was an error processing the field's update
// method.
////////////////////////////////////////////////////////////////////
bool CConnectionRepository::
handle_update_field() {
#ifdef HAVE_PYTHON
PStatTimer timer(_update_pcollector);
int do_id = _di.get_uint32();
if (_python_repository != (PyObject *)NULL) {
PyObject *doId2do =
PyObject_GetAttrString(_python_repository, "doId2do");
nassertr(doId2do != NULL, false);
PyObject *doId = PyInt_FromLong(do_id);
PyObject *distobj = PyDict_GetItem(doId2do, doId);
Py_DECREF(doId);
Py_DECREF(doId2do);
if (distobj != NULL) {
PyObject *dclass_obj = PyObject_GetAttrString(distobj, "dclass");
nassertr(dclass_obj != NULL, false);
PyObject *dclass_this = PyObject_GetAttrString(dclass_obj, "this");
Py_DECREF(dclass_obj);
nassertr(dclass_this != NULL, false);
DCClass *dclass = (DCClass *)PyInt_AsLong(dclass_this);
Py_DECREF(dclass_this);
// It's a good idea to ensure the reference count to distobj is
// raised while we call the update method--otherwise, the update
// method might get into trouble if it tried to delete the
// object from the doId2do map.
Py_INCREF(distobj);
dclass->receive_update(distobj, _di);
Py_DECREF(distobj);
if (PyErr_Occurred()) {
return false;
}
}
}
#endif // HAVE_PYTHON
return true;
}
#ifndef NDEBUG
////////////////////////////////////////////////////////////////////
// Function: CConnectionRepository::describe_message
// Access: Private
// Description: Unpacks the message and reformats it for user
// consumption, writing a description on the indicated
// output stream.
////////////////////////////////////////////////////////////////////
void CConnectionRepository::
describe_message(ostream &out, const string &prefix,
const string &message_data) const {
DCPacker packer;
packer.set_unpack_data(message_data);
CHANNEL_TYPE do_id;
int msg_type;
bool is_update = false;
if (!_client_datagram) {
packer.RAW_UNPACK_CHANNEL(); // msg_channel
packer.RAW_UNPACK_CHANNEL(); // msg_sender
packer.raw_unpack_uint8(); // sec_code
msg_type = packer.raw_unpack_uint16();
is_update = (msg_type == STATESERVER_OBJECT_UPDATE_FIELD);
} else {
msg_type = packer.raw_unpack_uint16();
is_update = (msg_type == CLIENT_OBJECT_UPDATE_FIELD);
}
if (!is_update) {
out << prefix << "message " << msg_type << "\n";
} else {
// It's an update message. Figure out what dclass the object is
// based on its doId, so we can decode the rest of the message.
do_id = packer.raw_unpack_uint32();
DCClass *dclass = NULL;
#ifdef HAVE_PYTHON
if (_python_repository != (PyObject *)NULL) {
PyObject *doId2do =
PyObject_GetAttrString(_python_repository, "doId2do");
nassertv(doId2do != NULL);
PyObject *doId = PyInt_FromLong(do_id);
PyObject *distobj = PyDict_GetItem(doId2do, doId);
Py_DECREF(doId);
Py_DECREF(doId2do);
if (distobj != NULL) {
PyObject *dclass_obj = PyObject_GetAttrString(distobj, "dclass");
nassertv(dclass_obj != NULL);
PyObject *dclass_this = PyObject_GetAttrString(dclass_obj, "this");
Py_DECREF(dclass_obj);
nassertv(dclass_this != NULL);
dclass = (DCClass *)PyInt_AsLong(dclass_this);
Py_DECREF(dclass_this);
}
}
#endif // HAVE_PYTHON
int field_id = packer.raw_unpack_uint16();
if (dclass == (DCClass *)NULL) {
out << prefix << "update for unknown object " << do_id
<< ", field " << field_id << "\n";
} else {
out << prefix << "update for " << dclass->get_name()
<< " " << do_id << ": ";
DCField *field = dclass->get_field_by_index(field_id);
if (field == (DCField *)NULL) {
out << "unknown field " << field_id << "\n";
} else {
out << field->get_name();
packer.begin_unpack(field);
packer.unpack_and_format(out);
packer.end_unpack();
out << "\n";
}
}
}
}
#endif // NDEBUG
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