Commit graph

205 commits

Author SHA1 Message Date
tstarling cebe775ee8 Added more Lua environment features
Package library:

* Added a simulation of the Lua 5.1 package library.
* Removed mw.import(), replaced it with a package loader. Packages can be
  retrieved from the wiki, using require('Module:Foo'), or from files
  distributed with Scribunto, using require('foo'). The "Module:" prefix allows
  for source compatibility with existing Lua code.
* Added a couple of libraries from LuaForge: luabit and stringtools.
* Made fetchModuleFromParser() return null on error instead of throwing an
  exception, to more easily support the desired behaviour of the package loader,
  which needs to return null on error.
* Renamed mw.setupEnvironment() to mw.setup() since it is setting up things
  other than the environment now.
* In MWServer:handleRegisterLibrary(), remove the feature which interprets dots
  in library names, since LuaSandbox doesn't support this.

Improved module isolation and related refactoring:

* Expose restricted versions of getfenv() and setfenv() to user Lua code.
  Requires luasandbox r114952.
* Don't cache the export list returned by module execution for later function
  calls. This breaks isolation of #invoke calls, since the local variables are
  persistent.
* Removed ScribuntoFunctionBase and its children, since it doesn't really have
  a purpose if it can't cache anything. Instead, invoke functions using a module
  method called invoke().
* Removed Module::initialize(), replaced it with a validate() function. This is
  a more elegant interface and works better with the new module caching scheme.
* Use a Status object for the return value of Engine::validate() instead of an
  array. Use the formatting facilities of the Status class.

Other:

* Removed "too many returns" error, doesn't fit in with Lua conventions.
* Use the standalone engine by default, so that the extension will work without
  configuration for more people.
* Added an accessor for $engine->interpreter
* Fix mw.clone() to correctly clone metatables
* If the standalone interpreter exits due to an error, there are some contexts
  where the initial error will be caught and ignored, and the user will see the
  error from checkValid() instead. In this case, rethrow the original error for
  a more informative message.
* Load mw.lua into the initial standalone environment, to reduce code
  duplication between mw.lua and MWServer.lua.
* Fixed a bug in Scribunto_LuaStandaloneInterpreter::handleCall() for functions
  that return no results.
* Fixed a bug in encodeLuaVar() for strings with "\r". Added test case.
* In MWServer.lua, don't call error() for internal errors, instead just print
  the error and exit. This avoids a protocol violation when an error is
  encountered from within handleCall().
* Added lots of documentation. Lua doc comments are in LuaDoc format.

Change-Id: Ie2fd572c362bedf02f45d3fa5352a5280e034740
2012-04-18 13:46:18 +10:00
tstarling 889f4e42a5 Allow PHP functions to return multiple values to Lua
Corresponding luasandbox commit is r114920.

Change-Id: I10fe726795623e2976c9ddadaa4d9b6d44b30bed
2012-04-16 15:43:34 +10:00
tstarling 16d132312f Remove old check for luasandbox extension
Change-Id: I08594015ce044d7fab129b8bbbef2a92382f6870
2012-04-16 15:06:06 +10:00
tstarling b0f00103e2 Added tests and fixed bugs
* Added unit tests for the two Lua interpreter classes
* Fixed a bug in checkType()
* Have Scribunto_LuaSandboxInterpreter throw an exception on construct
  when the extension doesn't exist, to match the standalone behaviour.
* In Scribunto_LuaSandboxInterpreter, removed debugging statements
  accidentally left in.
* Convert LuaSandboxTimeoutError to the appropriate common error
  message.
* Moved the option munging from the sandbox engine to the interpreter,
  so that the interpreter can be unit tested separately.
* Use /bin/sh instead of bash for lua_ulimit.sh, since dash is smaller
  and still supports ulimit.
* Use exec to run the lua binary, so that the vsize of the shell doesn't
  add to the memory limit.
* Added a quit function to the standalone interpreter. Unused at present.
* Don't add a comma after the last element of a table in a Lua
  expression.
* Make the SIGXCPU detection work: proc_open() runs the command via a
  shell, which reports signals in the child via the exit status, so
  proc_get_status() will never return a valid termsig element.
* In MWServer:call(), fixed a bug causing the return values to be
  wrapped in an array.
* Fixed a misunderstanding of what select() does.
* In MWServer:getStatus(), fixed indexes so that vsize will be correct.
  Removed RSS, since it wasn't used anyway and turns out to be measured
  in multiples of the page size, and I couldn't be bothered trying to
  fetch that from getconf. Return the PID and vsize as numbers rather
  than strings.
* Added a simple table dump feature to MWServer:debug().
* Fixed brackets in MWServer:tostring().
* Added missing Linux 32-bit binary.

Change-Id: Ibf5f4656b1c0a9f81287d363184c3fe9d2abdafd
2012-04-16 14:41:08 +10:00
tstarling 54cedd69b8 Introduced standalone interpreter, implemented module isolation
* Introduced a Lua implementation based on shelling out to a standard Lua binary.
* Bundled several Lua binaries for common platforms. I haven't added a 32-bit Linux binary yet, but that will come.
* Refactored the existing Lua class, bringing out functionality common to all Lua implementations into a set of common base classes.
* Moved the bulk of the implementation-specific functionality into a set of "interpreter" classes.
* Renamed LuaSandboxEngine to Scribunto_LuaSandboxEngine
* Don't create an engine object unconditionally when the ParserLimitReport hook is called.
* Implemented isolation of module global variable namespaces. This means that separate {{#invoke}} calls can't pass data to each other -- this was a desired feature in planning since it allows more flexibility in wikitext parser design. Isolation for mw.import() means that modules cannot accidentally create global variables which affect other modules -- exports are solely via the return value.

Change-Id: I3fa35651fe5b1fbfd85adeadc220b1ea31cd6f0b
2012-04-13 20:45:26 +10:00