From 69dbc046eb5a82b38c6d5c3302e9b3b0b3c1bcf1 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Mon, 21 Feb 2011 16:10:36 +0200
Subject: preliminary lua scripting framework for objects

---
 src/serverobject.cpp | 433 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 429 insertions(+), 4 deletions(-)

(limited to 'src/serverobject.cpp')

diff --git a/src/serverobject.cpp b/src/serverobject.cpp
index ffb6059dc..2fd3a1bfb 100644
--- a/src/serverobject.cpp
+++ b/src/serverobject.cpp
@@ -18,11 +18,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 #include "serverobject.h"
+#include <fstream>
+#include "environment.h"
 
-ServerActiveObject::ServerActiveObject(u16 id, v3f pos):
+ServerActiveObject::ServerActiveObject(ServerEnvironment *env, u16 id, v3f pos):
 	ActiveObject(id),
 	m_known_by_count(0),
 	m_removed(false),
+	m_env(env),
 	m_base_position(pos)
 {
 }
@@ -31,8 +34,12 @@ ServerActiveObject::~ServerActiveObject()
 {
 }
 
-TestSAO::TestSAO(u16 id, v3f pos):
-	ServerActiveObject(id, pos),
+/*
+	TestSAO
+*/
+
+TestSAO::TestSAO(ServerEnvironment *env, u16 id, v3f pos):
+	ServerActiveObject(env, id, pos),
 	m_timer1(0),
 	m_age(0)
 {
@@ -67,9 +74,427 @@ void TestSAO::step(float dtime, Queue<ActiveObjectMessage> &messages)
 		data += " ";
 		data += itos(m_base_position.Z);
 
-		//ActiveObjectMessage aom(getId(), true, data);
 		ActiveObjectMessage aom(getId(), false, data);
 		messages.push_back(aom);
 	}
 }
 
+/*
+	LuaSAO
+*/
+
+extern "C"{
+#include "lstring.h"
+}
+
+/*
+	object_set_base_position(self, x,y,z)
+	x,y,z = object_get_base_position(self)
+	object_add_message(self, data)
+	object_remove(self)
+*/
+
+/*
+	object_set_base_position(self, x, y, z)
+*/
+static int lf_object_set_base_position(lua_State *L)
+{
+	// 4: z
+	lua_Number z = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 3: y
+	lua_Number y = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 2: x
+	lua_Number x = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 1: self
+	LuaSAO *self = (LuaSAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+	
+	self->setBasePosition(v3f(x*BS,y*BS,z*BS));
+	
+	return 0; // Number of return values
+}
+
+/*
+	object_get_base_position(self)
+*/
+static int lf_object_get_base_position(lua_State *L)
+{
+	// 1: self
+	LuaSAO *self = (LuaSAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+	
+	v3f pos = self->getBasePosition();
+
+	lua_pushnumber(L, pos.X/BS);
+	lua_pushnumber(L, pos.Y/BS);
+	lua_pushnumber(L, pos.Z/BS);
+	return 3; // Number of return values
+}
+
+/*
+	object_add_message(self, string data)
+	lf = luafunc
+*/
+static int lf_object_add_message(lua_State *L)
+{
+	// 2: data
+	size_t datalen = 0;
+	const char *data_c = lua_tolstring(L, -1, &datalen);
+	lua_pop(L, 1);
+	// 1: self
+	LuaSAO *self = (LuaSAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+	assert(data_c);
+	
+	std::string data(data_c, datalen);
+	//dstream<<"object_add_message: data="<<data<<std::endl;
+	
+	// Create message and add to queue
+	ActiveObjectMessage aom(self->getId());
+	aom.reliable = true;
+	aom.datastring = data;
+	self->m_message_queue.push_back(aom);
+
+	return 0; // Number of return values
+}
+
+/*
+	object_get_node(x,y,z)
+*/
+static int lf_object_get_node(lua_State *L)
+{
+	// 4: z
+	lua_Number z = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 3: y
+	lua_Number y = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 2: x
+	lua_Number x = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 1: self
+	LuaSAO *self = (LuaSAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+
+	v3s16 pos = floatToInt(v3f(x,y,z), 1.0);
+
+	/*dstream<<"Checking node from pos=("<<pos.X<<","<<pos.Y<<","<<pos.Z
+			<<")"<<std::endl;*/
+	
+	// Get the node
+	MapNode n(CONTENT_IGNORE);
+	n = self->getEnv()->getMap().getNodeNoEx(pos);
+
+	// Create a table with some data about the node
+	lua_newtable(L);
+	lua_pushstring(L, "content");
+	lua_pushinteger(L, n.d);
+	lua_settable(L, -3);
+	lua_pushstring(L, "walkable");
+	lua_pushboolean(L, content_features(n.d).walkable);
+	lua_settable(L, -3);
+	
+	// Return the table
+	return 1;
+}
+
+/*
+	object_remove(x,y,z)
+*/
+static int lf_object_remove(lua_State *L)
+{
+	// 1: self
+	LuaSAO *self = (LuaSAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+
+	self->m_removed = true;
+
+	return 0;
+}
+
+LuaSAO::LuaSAO(ServerEnvironment *env, u16 id, v3f pos):
+	ServerActiveObject(env, id, pos),
+	L(NULL)
+{
+	dstream<<"LuaSAO::LuaSAO(): id="<<id<<std::endl;
+	L = lua_open();
+	assert(L);
+	
+	// Load libraries
+	luaopen_base(L);
+	luaopen_table(L);
+	luaopen_string(L);
+	luaopen_math(L);
+	
+	// Add globals
+	//lua_pushlightuserdata(L, this);
+	//lua_setglobal(L, "self");
+	
+	// Register functions
+	lua_register(L, "object_set_base_position", lf_object_set_base_position);
+	lua_register(L, "object_get_base_position", lf_object_get_base_position);
+	lua_register(L, "object_add_message", lf_object_add_message);
+	lua_register(L, "object_get_node", lf_object_get_node);
+	lua_register(L, "object_remove", lf_object_remove);
+}
+
+LuaSAO::~LuaSAO()
+{
+	lua_close(L);
+}
+
+std::string LuaSAO::getClientInitializationData()
+{
+	/*
+		Read client-side script from file
+	*/
+	
+	std::string relative_path;
+	relative_path += "luaobjects/";
+	relative_path += m_script_name;
+	relative_path += "/client.lua";
+	std::string full_path = porting::getDataPath(relative_path.c_str());
+	std::string script;
+	std::ifstream file(full_path.c_str(), std::ios::binary | std::ios::ate);
+	int size = file.tellg();
+	SharedBuffer<char> buf(size);
+	file.seekg(0, std::ios::beg);
+	file.read(&buf[0], size);
+	file.close();
+	
+	/*
+		Create data string
+	*/
+	std::string data;
+
+	// Append script
+	std::string script_string(&buf[0], buf.getSize());
+	data += serializeLongString(script_string);
+
+	/*
+		Get data from server-side script for inclusion
+	*/
+	std::string other_data;
+	
+	do{
+
+		const char *funcname = "get_client_init_data";
+		lua_getglobal(L, funcname);
+		if(!lua_isfunction(L,-1))
+		{
+			lua_pop(L,1);
+			dstream<<"WARNING: LuaSAO: Function not found: "
+					<<funcname<<std::endl;
+			break;
+		}
+		
+		// Parameters:
+		// 1: self
+		lua_pushlightuserdata(L, this);
+		
+		// Call (1 parameters, 1 result)
+		if(lua_pcall(L, 1, 1, 0))
+		{
+			dstream<<"WARNING: LuaSAO: Error running function "
+					<<funcname<<": "
+					<<lua_tostring(L,-1)<<std::endl;
+			break;
+		}
+
+		// Retrieve result
+		if(!lua_isstring(L,-1))
+		{
+			dstream<<"WARNING: LuaSAO: Function "<<funcname
+					<<" didn't return a string"<<std::endl;
+			break;
+		}
+		
+		size_t cs_len = 0;
+		const char *cs = lua_tolstring(L, -1, &cs_len);
+		lua_pop(L,1);
+
+		other_data = std::string(cs, cs_len);
+
+	}while(0);
+	
+	data += serializeLongString(other_data);
+
+	return data;
+}
+
+std::string LuaSAO::getServerInitializationData()
+{
+	std::string data;
+	
+	// Script name
+	data.append(serializeString(m_script_name));
+
+	/*
+		Get data from server-side script for inclusion
+	*/
+	std::string other_data;
+	
+	do{
+
+		const char *funcname = "get_server_init_data";
+		lua_getglobal(L, funcname);
+		if(!lua_isfunction(L,-1))
+		{
+			lua_pop(L,1);
+			dstream<<"WARNING: LuaSAO: Function not found: "
+					<<funcname<<std::endl;
+			break;
+		}
+		
+		// Parameters:
+		// 1: self
+		lua_pushlightuserdata(L, this);
+		
+		// Call (1 parameters, 1 result)
+		if(lua_pcall(L, 1, 1, 0))
+		{
+			dstream<<"WARNING: LuaSAO: Error running function "
+					<<funcname<<": "
+					<<lua_tostring(L,-1)<<std::endl;
+			break;
+		}
+
+		// Retrieve result
+		if(!lua_isstring(L,-1))
+		{
+			dstream<<"WARNING: LuaSAO: Function "<<funcname
+					<<" didn't return a string"<<std::endl;
+			break;
+		}
+		
+		size_t cs_len = 0;
+		const char *cs = lua_tolstring(L, -1, &cs_len);
+		lua_pop(L,1);
+
+		other_data = std::string(cs, cs_len);
+
+	}while(0);
+	
+	data += serializeLongString(other_data);
+
+	return data;
+}
+
+void LuaSAO::initialize(const std::string &data)
+{
+	std::istringstream is(data, std::ios::binary);
+	std::string script_name = deSerializeString(is);
+	std::string other = deSerializeLongString(is);
+
+	loadScripts(script_name);
+
+	/*
+		Call initialize(self, data) in the script
+	*/
+	
+	const char *funcname = "initialize";
+	lua_getglobal(L, funcname);
+	if(!lua_isfunction(L,-1))
+	{
+		lua_pop(L,1);
+		dstream<<"WARNING: LuaSAO: Function not found: "
+				<<funcname<<std::endl;
+		return;
+	}
+	
+	// Parameters:
+	// 1: self
+	lua_pushlightuserdata(L, this);
+	// 2: data (other)
+	lua_pushlstring(L, other.c_str(), other.size());
+	
+	// Call (2 parameters, 0 result)
+	if(lua_pcall(L, 2, 0, 0))
+	{
+		dstream<<"WARNING: LuaSAO: Error running function "
+				<<funcname<<": "
+				<<lua_tostring(L,-1)<<std::endl;
+		return;
+	}
+}
+
+void LuaSAO::loadScripts(const std::string &script_name)
+{
+	m_script_name = script_name;
+	
+	std::string relative_path;
+	relative_path += "luaobjects/";
+	relative_path += script_name;
+	std::string server_file = relative_path + "/server.lua";
+	std::string server_path = porting::getDataPath(server_file.c_str());
+
+	// Load the file
+	int ret;
+	ret = luaL_loadfile(L, server_path.c_str());
+	if(ret)
+	{
+		const char *message = lua_tostring(L, -1);
+		lua_pop(L, 1);
+		dstream<<"LuaSAO::loadScript(): lua_loadfile failed: "
+				<<message<<std::endl;
+		assert(0);
+		return;
+	}
+	ret = lua_pcall(L, 0, 0, 0);
+	if(ret)
+	{
+		const char *message = lua_tostring(L, -1);
+		lua_pop(L, 1);
+		dstream<<"LuaSAO::loadScript(): lua_pcall failed: "
+				<<message<<std::endl;
+		assert(0);
+		return;
+	}
+}
+
+void LuaSAO::step(float dtime, Queue<ActiveObjectMessage> &messages)
+{
+	lua_getglobal(L, "step");
+	if(!lua_isfunction(L,-1))
+	{
+		lua_pop(L,1);
+		dstream<<"WARNING: LuaSAO::step(): step function not found"<<std::endl;
+		return;
+	}
+	
+	// Parameters:
+	// 1: self
+	lua_pushlightuserdata(L, this);
+	// 2: dtime
+	lua_pushnumber(L, dtime);
+	
+	// Call (2 parameters, 0 result)
+	if(lua_pcall(L, 2, 0, 0))
+	{
+		dstream<<"WARNING: LuaSAO::step(): Error running function step(): "
+				<<lua_tostring(L,-1)<<std::endl;
+		return;
+	}
+
+	// Move messages
+	while(m_message_queue.size() != 0)
+	{
+		messages.push_back(m_message_queue.pop_front());
+	}
+}
+
+
+
-- 
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