69 lines
2.2 KiB
Lua
69 lines
2.2 KiB
Lua
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#!/usr/bin/env lua
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--[[
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restful.lua - CGI script providing a local RESTful API on the Fluksometer.
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Copyright (c) 2010 Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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]]--
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--- Decode a URL's query string
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-- @param QS the to-be-decoded query string (optional)
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-- @return table containing [name] = value pairs
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local function query_decode(QS)
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local param = {}
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for name, value in (QS or os.getenv("QUERY_STRING")):gmatch("([^&=]+)=([^&=]+)") do
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param[name] = value
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end
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return param
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end
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--- Fetch the sensor id in the HTTP request.
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-- @return sensor id
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local function sensor_id()
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return os.getenv("SCRIPT_NAME"):match("/sensor/([%x]+)")
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end
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local param = query_decode()
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local path = "/var/run/fluksod/sensor/"
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local version = "1.0"
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-- Hardcoding path and version parameters lowers GET response time from 200ms to 90ms.
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-- local uci = require "luci.model.uci".cursor()
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-- local path = uci:get("flukso", "main", "localDir") .. "/"
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-- local version = uci:get("flukso", "main", "localVersion")
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if param.interval == "minute" and param.unit == "watt" and param.version == version then
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local pre, post = "", ""
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if param.jsonp_callback then
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pre, post = param.jsonp_callback .. "(", ")"
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end
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io.input(path .. sensor_id())
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io.write("Content-Type: application/json", "\n\n")
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io.write(pre, io.read("*all"), post)
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else
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io.write("status: 400 Bad Request", "\n\n")
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io.write("Malformed query string: interval, unit and version query parameters are required.")
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end
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