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-----------------------------------------------------------------------------

-- JSONRPC4Lua: JSON RPC server for exposing Lua objects as JSON RPC callable

-- objects via http.

-- json.rpcserver Module.

-- Author: Craig Mason-Jones

-- Homepage: http://json.luaforge.net/

-- Version: 0.9.40

-- This module is released under the MIT License (MIT).

-- Please see LICENCE.txt for details.

--

-- USAGE:

-- This module exposes one function:

-- server(luaClass, packReturn)

-- Manages incoming JSON RPC request forwarding the method call to the given

-- object. If packReturn is true, multiple return values are packed into an

-- array on return.

--

-- IMPORTANT NOTES:

-- 1. This version ought really not be 0.9.10, since this particular part of the

-- JSONRPC4Lua package is very first-draft. However, the JSON4Lua package with which

-- it comes is quite solid, so there you have it :-)

-- 2. This has only been tested with Xavante webserver, with which it works

-- if you patch CGILua to accept 'text/plain' content type. See doc\cgilua_patch.html

-- for details.

----------------------------------------------------------------------------

module ('json.rpcserver')

---

-- Implements a JSON RPC Server wrapping for luaClass, exposing each of luaClass's

-- methods as JSON RPC callable methods.

-- @param luaClass The JSON RPC class to expose.

-- @param packReturn If true, the server will automatically wrap any

-- multiple-value returns into an array. Single returns remain single returns. If

-- false, when a function returns multiple values, only the first of these values will

-- be returned.

--

function serve(luaClass, packReturn)

cgilua.contentheader('text','plain')

require('cgilua')

require ('json')

local postData = ""

if not cgilua.servervariable('CONTENT_LENGTH') then

cgilua.put("Please access JSON Request using HTTP POST Request")

return 0

else

postData = cgi[1] -- SAPI.Request.getpostdata() --[[{ "id":1, "method":"echo","params":["Hi there"]}]] --

end

-- @TODO Catch an error condition on decoding the data

local jsonRequest = json.decode(postData)

local jsonResponse = {}

jsonResponse.id = jsonRequest.id

local method = luaClass[ jsonRequest.method ]

if not method then

jsonResponse.error = 'Method ' .. jsonRequest.method .. ' does not exist at this server.'

else

local callResult = { pcall( method, unpack( jsonRequest.params ) ) }

if callResult[1] then -- Function call successfull

table.remove(callResult,1)

if packReturn and table.getn(callResult)>1 then

jsonResponse.result = callResult

else

jsonResponse.result = unpack(callResult) -- NB: Does not support multiple argument returns

end

else

jsonResponse.error = callResult[2]

end

end

-- Output the result

-- TODO: How to be sure that the result and error tags are there even when they are nil in Lua?

-- Can force them by hand... ?

cgilua.contentheader('text','plain')

cgilua.put( json.encode( jsonResponse ) )

end