example_use.lua

local oneprpc = require 'oneprpc'
local json = require 'json'

local rpc = oneprpc:new({cik = "9829879a04efb8f4a1b42e22245739678fd4a94e"})

local status, rid = rpc.create(
  "dataport",
  {
    format = "float",
    name = "Temperature",
    retention = {
      count = "10",
      duration = "infinity"
    }
  }
)
print(status, rid)

local status = rpc.map("alias", rid, "temp")
print(status)

local status, timestamp = rpc.write({alias="temp"}, 23.3)
print(status, timestamp)

local status, values = rpc.read({alias="temp"}, {})
print(status)
if "ok" == status then
  print(json.encode(values))
end

local status = rpc.drop({alias="temp"})
print(status)

local status, info = rpc.info({alias=""}, {})
print(status)
if "ok" == status then
  print(json.encode(info))
end

oneprpc.lua

--[[
Copyright (c) 2014 Patrick Barrett
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
]]

local http = require('socket.http')
local json = require('json')

return {
  _VERSION     = "exosite-lua 0.1.0-dev",
  _DESCRIPTION = "A Lua client library for the Exosite RPC API.",
  _AUTHOR      = "Patrick Barrett <patrick@mkii.org>",
  _COPYRIGHT   = "Copyright 2014 Patrick Barrett",
  _LICENSE     = "http://opensource.org/licenses/BSD-3-Clause",
  url = 'https://m2.exosite.com/onep:v1/rpc/process',
  cache = true,
  new = function (self, settings)
    local settings = {
      url = nil ~= settings and settings.url or self.url,
      cik = nil ~= settings and settings.cik or self.cik
    }
    return setmetatable({}, {
      __index = function(rpc, procedure)
        local f = function (...)
          return self.process(settings, procedure, ...)
        end
        if self.cache then
          rpc[procedure] = f -- cache generated function for reuse
        end
        return f
      end
    })
  end,
  process = function (settings, procedure, ...)
    local url = settings.url
    local cik = settings.cik
    local call = {
      id = 1,
      procedure = procedure,
      arguments = table.pack(...)
    }
    call.arguments.n = nil
    local request = json.encode({
      auth = {cik = cik},
      calls = {call}
    })
    local reply = {}
    local _, code, headers = http.request({
      method = "POST",
      url = url,
      headers = {
        ["content-length"] = #request,
        ["content-type"] = "application/json"
      },
      source = ltn12.source.string(request),
      sink = ltn12.sink.table(reply)
    })
    if code == 200 then
      local response = json.decode(table.concat(reply))
      if nil ~= response[1] then
        if nil ~= response[1].status then
          return response[1].status, response[1].result
        end
        return nil, response[1].error
      end
      return nil, response.error
    end
    return nil, {status = code, body = table.concat(reply), headers = headers}
  end
}