mesh.lua

local util = require 'gluon.util'

local json = require 'luci.jsonc'
local ltn12 = require 'luci.ltn12'
local lutil = require 'luci.util'

local assert = assert
local io = io
local ipairs = ipairs


local mesh_interfaces = '/lib/gluon/core/mesh_interfaces.json'
local interface_lock = '/var/lock/gluon_core_mesh_interfaces'


local function _interfaces()
  local file = io.open(mesh_interfaces)
	if not file then
		return {}
	end

  local decoder = json.new()
  ltn12.pump.all(ltn12.source.file(file), decoder:sink())

  file:close()

  return assert(decoder:get())
end

local function _update(ifs)
	for _, v in pairs(ifs) do
		v[{}] = true
	end
	ifs[{}] = true

	file = assert(io.open(mesh_interfaces, 'w'))
	file:write(json.stringify(ifs))
	file:close()
end

local function _register_interface(name, info)
	local ifs = _interfaces()
	ifs[name] = info or {}
	_update(ifs)
end

local function _unregister_interface(name)
	local ifs = _interfaces()
	ifs[name] = nil
	_update(ifs)
end


module 'gluon.mesh'

function interfaces()
	return util.locked(interface_lock, _interfaces)
end

-- info may hold additional information about a mesh interface, the following values are defined:
--
-- transitive (boolean): defines if the interface provides transitive connectivity (default: false)
-- fixed_mtu (boolean): defines if the interface's MTU may not be changed (default: false)
function register_interface(name, info)
	util.locked(interface_lock, _register_interface, name, info)
end

function unregister_interface(name)
	util.locked(interface_lock, _unregister_interface, name)
end