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Fixed inter-plugin calls. 

When an inter-plugin call failed due to function not found, the server would maul the LuaState and "yield".
Fixes #1959.
This commit is contained in:
Mattes D 2015-05-07 23:02:18 +02:00
parent ceac39c4cd
commit fee690a3d1
3 changed files with 19 additions and 27 deletions
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28
MCServer/Plugins/Debuggers/Debuggers.lua
View File

@ -54,7 +54,7 @@ function Initialize(a_Plugin)
-- TestBlockAreas()
-- TestSQLiteBindings()
-- TestExpatBindings()
-- TestPluginCalls()
TestPluginCalls()
TestBlockAreasString()
TestStringBase64()
@ -157,26 +157,18 @@ function TestPluginCalls()
-- The Split parameter should be a table, but it is not used in that function anyway,
-- so we can get away with passing nil to it.
-- Use the old, deprecated and unsafe method:
local Core = cPluginManager:Get():GetPlugin("Core")
if (Core ~= nil) then
LOGINFO("Calling Core::ReturnColorFromChar() the old-fashioned way...")
local Gray = Core:Call("ReturnColorFromChar", nil, "8")
if (Gray ~= cChatColor.Gray) then
LOGWARNING("Call failed, exp " .. cChatColor.Gray .. ", got " .. (Gray or "<nil>"))
else
LOGINFO("Call succeeded")
end
end
-- Use the new method:
LOGINFO("Calling Core::ReturnColorFromChar() the recommended way...")
local Gray = cPluginManager:CallPlugin("Core", "ReturnColorFromChar", nil, "8")
LOG("Debuggers: Calling NoSuchPlugin.FnName()...")
cPluginManager:CallPlugin("NoSuchPlugin", "FnName", "SomeParam")
LOG("Debuggers: Calling Core.NoSuchFunction()...")
cPluginManager:CallPlugin("Core", "NoSuchFunction", "SomeParam")
LOG("Debuggers: Calling Core.ReturnColorFromChar(..., \"8\")...")
local Gray = cPluginManager:CallPlugin("Core", "ReturnColorFromChar", "split", "8")
if (Gray ~= cChatColor.Gray) then
LOGWARNING("Call failed, exp " .. cChatColor.Gray .. ", got " .. (Gray or "<nil>"))
LOGWARNING("Debuggers: Call failed, exp " .. cChatColor.Gray .. ", got " .. (Gray or "<nil>"))
else
LOGINFO("Call succeeded")
LOG("Debuggers: Call succeeded")
end
LOG("Debuggers: Inter-plugin calls done.")
end

13
src/Bindings/LuaState.cpp
View File

@ -1535,7 +1535,7 @@ int cLuaState::CallFunctionWithForeignParams(
if (!PushFunction(a_FunctionName.c_str()))
{
LOGWARNING("Function '%s' not found", a_FunctionName.c_str());
lua_pop(m_LuaState, 2);
lua_settop(m_LuaState, OldTop);
return -1;
}
@ -1543,7 +1543,7 @@ int cLuaState::CallFunctionWithForeignParams(
if (CopyStackFrom(a_SrcLuaState, a_SrcParamStart, a_SrcParamEnd) < 0)
{
// Something went wrong, fix the stack and exit
lua_pop(m_LuaState, 2);
lua_settop(m_LuaState, OldTop);
m_NumCurrentFunctionArgs = -1;
m_CurrentFunctionName.clear();
return -1;
@ -1554,13 +1554,8 @@ int cLuaState::CallFunctionWithForeignParams(
if (ReportErrors(s))
{
LOGWARN("Error while calling function '%s' in '%s'", a_FunctionName.c_str(), m_SubsystemName.c_str());
// Fix the stack.
// We don't know how many values have been pushed, so just get rid of any that weren't there initially
int CurTop = lua_gettop(m_LuaState);
if (CurTop > OldTop)
{
lua_pop(m_LuaState, CurTop - OldTop);
}
// Reset the stack:
lua_settop(m_LuaState, OldTop);
// Reset the internal checking mechanisms:
m_NumCurrentFunctionArgs = -1;

5
src/Bindings/ManualBindings.cpp
View File

@ -1988,6 +1988,11 @@ static int tolua_cPluginManager_CallPlugin(lua_State * tolua_S)
{
return 0;
}
if (Callback.m_NumReturns < 0)
{
// The call has failed, there are zero return values. Do NOT return negative number (Lua considers that a "yield")
return 0;
}
return Callback.m_NumReturns;
}