mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Scribunto
synced 2024-12-18 10:53:37 +00:00
177 lines
4.6 KiB
Plaintext
177 lines
4.6 KiB
Plaintext
The Lua standalone engine has a message-based protocol for communicating between
|
|
PHP and Lua.
|
|
|
|
Messages start with a 16 byte header. The first 8 bytes are the body length in
|
|
hexadecimal. The second 8 bytes are (length * 2 - 1) also in hexadecimal.
|
|
|
|
For messages passed from PHP to Lua, the body is encoded as a Lua expression.
|
|
The expression may reference a table in a variable called "chunks", which
|
|
contains an array of functions.
|
|
|
|
Messages passed from Lua to PHP have their body encoded in PHP serialize()
|
|
format, and then "\\", "\r", and "\n" are replaced with "\\\\", "\\r", and
|
|
"\\n" to avoid issues with text-mode file handles. They may include instances
|
|
of function objects which have an "id" member for passing back to Lua as an
|
|
index in the chunk table.
|
|
|
|
The expressions encoded into the message bodies are associative arrays. The "op"
|
|
member of the array gives the operation to be performed by the message.
|
|
|
|
Every request message demands exactly one response message in reply. When a
|
|
request message is sent, the responder does not need to send the corresponding
|
|
response message as its next message. It may instead send its own request
|
|
message. In this way, a stack of pending requests can be accumulated. This
|
|
mechanism allows re-entrant and recursive calls.
|
|
|
|
All numerically-indexed arrays should start from index 1 unless otherwise
|
|
specified. Note that the number of values in an array may not match what Lua's
|
|
'#' operator returns if the array contains nils.
|
|
|
|
== Request messages sent from PHP to Lua ==
|
|
|
|
=== loadString ===
|
|
|
|
Load some executable Lua code (a "chunk") and return the resulting function ID.
|
|
|
|
Message parameters:
|
|
* op: "loadString"
|
|
* text: The string to load
|
|
* chunkName: The name of the string, for use in error messages
|
|
|
|
On success, the response message is:
|
|
|
|
* op: "return"
|
|
* nvalues: 1
|
|
* values: An array with a single element with the ID in it
|
|
|
|
On failure, the response message is:
|
|
|
|
* op: "error"
|
|
* value: The error message
|
|
|
|
=== call ===
|
|
|
|
Call a Lua function.
|
|
|
|
Message parameters:
|
|
* op: "call"
|
|
* id: The chunk ID
|
|
* nargs: Number of arguments, including nils
|
|
* args: The argument array
|
|
|
|
On success, the response message is:
|
|
|
|
* op: "return"
|
|
* nvalues: Number of return values, including nils
|
|
* values: All return values as an array
|
|
|
|
On failure, the response message is:
|
|
|
|
* op: "error"
|
|
* value: The value given to error(), usually an error message
|
|
* trace: A table giving a backtrace of the stack as it was when error() was
|
|
called, in a similar format to the one used by debug.getinfo(). Element 1 of
|
|
the table is the function that called error(), element 2 is the function that
|
|
called that, and so on.
|
|
|
|
=== registerLibrary ===
|
|
|
|
Register a set of functions in the sandbox environment.
|
|
|
|
Message parameters:
|
|
* op: "registerLibrary"
|
|
* name: The global variable name to register. May contain "." characters to
|
|
specify a global variable subtable.
|
|
* functions: An associative array mapping function name to ID
|
|
|
|
On success, the response message is:
|
|
|
|
* op: "return"
|
|
* nvalues: 0
|
|
* values: An empty array
|
|
|
|
On failure the response message is:
|
|
|
|
* op: "error"
|
|
* value: The error message
|
|
|
|
=== getStatus ===
|
|
|
|
Get status information about the Lua process.
|
|
|
|
Message parameters:
|
|
* op: "getStatus"
|
|
|
|
On success, the response message is:
|
|
|
|
* op: "return"
|
|
* nvalues: 1
|
|
* values: An array with a single element, which is an associative array mapping
|
|
status key to value. The status keys are:
|
|
** pid: The process identifier
|
|
** time: The amount of user and system time spent by the process, measured in clock ticks
|
|
** vsize: The virtual memory size in bytes
|
|
** rss: The resident set size in bytes
|
|
|
|
On failure, the response message is:
|
|
|
|
* op: "return"
|
|
* nvalues: 0
|
|
* values: An empty array
|
|
|
|
=== cleanupChunks ===
|
|
|
|
Tell Lua to release any chunks no longer referenced by PHP.
|
|
|
|
Message parameters:
|
|
* op: "cleanupChunks"
|
|
* ids: Table with keys being the chunk IDs still referenced by PHP, and non-falsey values
|
|
|
|
The response message is:
|
|
|
|
* op: "return"
|
|
* nvalues: 0
|
|
* values: An empty array
|
|
|
|
=== quit ===
|
|
|
|
Request graceful shutdown.
|
|
|
|
Message parameters:
|
|
* op: "quit"
|
|
|
|
No return message will be sent.
|
|
|
|
=== testquit ===
|
|
|
|
Request non-graceful shutdown, for testing.
|
|
|
|
Message parameters:
|
|
* op: "testquit"
|
|
|
|
No return message will be sent.
|
|
|
|
== Request messages sent from Lua to PHP ==
|
|
|
|
=== call ===
|
|
|
|
Call a PHP function.
|
|
|
|
Message parameters:
|
|
* op: "call"
|
|
* id: The function ID given by registerLibrary
|
|
* nargs: Number of arguments, including nils
|
|
* args: An array giving the function arguments
|
|
|
|
On success, the response message is:
|
|
|
|
* op: "return"
|
|
* nvalues: Number of return values, including nils
|
|
* values: All return values as an array
|
|
|
|
On failure the response message is:
|
|
|
|
* op: "error"
|
|
* value: The error message
|
|
|