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