project_files/frontlib/ipc/mapconn.c
author Periklis Ntanasis <pntanasis@gmail.com>
Fri, 13 Sep 2013 02:43:55 +0300
branchspacecampaign
changeset 9621 0e633b929825
parent 7576 65d29988fd3d
child 10017 de822cd3df3a
permissions -rw-r--r--
should fix deadlock checkpoint reported by Wuzzy
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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#include "mapconn.h"
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#include "ipcbase.h"
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#include "ipcprotocol.h"
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#include "../util/logging.h"
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#include "../util/buffer.h"
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#include "../util/util.h"
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#include <stdlib.h>
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typedef enum {
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	AWAIT_CONNECTION,
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	AWAIT_REPLY,
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	AWAIT_CLOSE,
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	FINISHED
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} mapconn_state;
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struct _flib_mapconn {
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	uint8_t mapBuffer[IPCBASE_MAPMSG_BYTES];
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	flib_ipcbase *ipcBase;
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	flib_vector *configBuffer;
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	mapconn_state progress;
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	void (*onSuccessCb)(void*, const uint8_t*, int);
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	void *onSuccessCtx;
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	void (*onFailureCb)(void*, const char*);
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	void *onFailureCtx;
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	bool running;
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	bool destroyRequested;
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};
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static void noop_handleSuccess(void *context, const uint8_t *bitmap, int numHedgehogs) {}
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static void noop_handleFailure(void *context, const char *errormessage) {}
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static void clearCallbacks(flib_mapconn *conn) {
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	conn->onSuccessCb = &noop_handleSuccess;
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	conn->onFailureCb = &noop_handleFailure;
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}
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static flib_vector *createConfigBuffer(const flib_map *mapdesc) {
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	flib_vector *result = NULL;
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	flib_vector *tempbuffer = flib_vector_create();
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	if(tempbuffer) {
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		bool error = false;
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		error |= flib_ipc_append_mapconf(tempbuffer, mapdesc, true);
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		error |= flib_ipc_append_message(tempbuffer, "!");
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		if(!error) {
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			result = tempbuffer;
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			tempbuffer = NULL;
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		}
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	}
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	flib_vector_destroy(tempbuffer);
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	return result;
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}
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flib_mapconn *flib_mapconn_create(const flib_map *mapdesc) {
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	if(log_badargs_if(mapdesc==NULL)) {
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		return NULL;
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	}
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	flib_mapconn *result = NULL;
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	flib_mapconn *tempConn = flib_calloc(1, sizeof(flib_mapconn));
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	if(tempConn) {
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		tempConn->ipcBase = flib_ipcbase_create();
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		tempConn->configBuffer = createConfigBuffer(mapdesc);
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		if(tempConn->ipcBase && tempConn->configBuffer) {
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			tempConn->progress = AWAIT_CONNECTION;
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			clearCallbacks(tempConn);
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			result = tempConn;
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			tempConn = NULL;
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		}
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	}
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	flib_mapconn_destroy(tempConn);
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	return result;
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}
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void flib_mapconn_destroy(flib_mapconn *conn) {
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	if(conn) {
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		if(conn->running) {
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			/*
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			 * The function was called from a callback, so the tick function is still running
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			 * and we delay the actual destruction. We ensure no further callbacks will be
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			 * sent to prevent surprises.
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			 */
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			clearCallbacks(conn);
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			conn->destroyRequested = true;
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		} else {
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			flib_ipcbase_destroy(conn->ipcBase);
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			flib_vector_destroy(conn->configBuffer);
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			free(conn);
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		}
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	}
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}
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int flib_mapconn_getport(flib_mapconn *conn) {
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	if(log_badargs_if(conn==NULL)) {
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		return 0;
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	}
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	return flib_ipcbase_port(conn->ipcBase);
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}
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void flib_mapconn_onSuccess(flib_mapconn *conn, void (*callback)(void* context, const uint8_t *bitmap, int numHedgehogs), void *context) {
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	if(!log_badargs_if(conn==NULL)) {
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		conn->onSuccessCb = callback ? callback : &noop_handleSuccess;
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		conn->onSuccessCtx = context;
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	}
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}
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void flib_mapconn_onFailure(flib_mapconn *conn, void (*callback)(void* context, const char *errormessage), void *context) {
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	if(!log_badargs_if(conn==NULL)) {
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		conn->onFailureCb = callback ? callback : &noop_handleFailure;
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		conn->onFailureCtx = context;
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	}
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}
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static void flib_mapconn_wrappedtick(flib_mapconn *conn) {
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	if(conn->progress == AWAIT_CONNECTION) {
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		flib_ipcbase_accept(conn->ipcBase);
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		switch(flib_ipcbase_state(conn->ipcBase)) {
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		case IPC_CONNECTED:
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			{
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				flib_constbuffer configBuffer = flib_vector_as_constbuffer(conn->configBuffer);
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				if(flib_ipcbase_send_raw(conn->ipcBase, configBuffer.data, configBuffer.size)) {
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					conn->progress = FINISHED;
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					conn->onFailureCb(conn->onFailureCtx, "Error sending map information to the engine.");
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					return;
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				} else {
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					conn->progress = AWAIT_REPLY;
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				}
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			}
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			break;
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		case IPC_NOT_CONNECTED:
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			conn->progress = FINISHED;
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			conn->onFailureCb(conn->onFailureCtx, "Engine connection closed unexpectedly.");
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			return;
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		default:
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			break;
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		}
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	}
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	if(conn->progress == AWAIT_REPLY) {
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		if(flib_ipcbase_recv_map(conn->ipcBase, conn->mapBuffer) >= 0) {
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			conn->progress = AWAIT_CLOSE;
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		} else if(flib_ipcbase_state(conn->ipcBase) != IPC_CONNECTED) {
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			conn->progress = FINISHED;
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			conn->onFailureCb(conn->onSuccessCtx, "Engine connection closed unexpectedly.");
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			return;
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		}
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	}
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	if(conn->progress == AWAIT_CLOSE) {
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		// Just do throwaway reads so we find out when the engine disconnects
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		uint8_t buf[256];
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		flib_ipcbase_recv_message(conn->ipcBase, buf);
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		if(flib_ipcbase_state(conn->ipcBase) != IPC_CONNECTED) {
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			conn->progress = FINISHED;
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			conn->onSuccessCb(conn->onSuccessCtx, conn->mapBuffer, conn->mapBuffer[IPCBASE_MAPMSG_BYTES-1]);
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			return;
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		}
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	}
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}
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void flib_mapconn_tick(flib_mapconn *conn) {
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	if(!log_badargs_if(conn==NULL)
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			&& !log_w_if(conn->running, "Call to flib_mapconn_tick from a callback")
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			&& !log_w_if(conn->progress == FINISHED, "We are already done.")) {
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		conn->running = true;
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		flib_mapconn_wrappedtick(conn);
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		conn->running = false;
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		if(conn->destroyRequested) {
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			flib_mapconn_destroy(conn);
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		}
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	}
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}