opus/sys/network/peripheral.lua

--[[
  Allow sharing of local peripherals.
]]--

local Event      = require('event')
local Peripheral = require('peripheral')
local Socket     = require('socket')

Event.addRoutine(function()
  print('peripheral: listening on port 189')
  while true do
    local socket = Socket.server(189)

    print('peripheral: connection from ' .. socket.dhost)

    Event.addRoutine(function()
      local uri = socket:read(2)
      if uri then
        local peripheral = Peripheral.lookup(uri)

-- only 1 proxy of this device can happen at one time
-- need to prevent multiple shares
        if not peripheral then
          print('peripheral: invalid peripheral ' .. uri)
          socket:write('Invalid peripheral: ' .. uri)
        else
          print('peripheral: proxing ' .. uri)
          local proxy = {
            methods = { }
          }

          if peripheral.blit then
            --peripheral = Util.shallowCopy(peripheral)
            peripheral.fastBlit = function(data)
              for _,v in ipairs(data) do
                peripheral[v.fn](unpack(v.args))
              end
            end
          end

          for k,v in pairs(peripheral) do
            if type(v) == 'function' then
              table.insert(proxy.methods, k)
            else
              proxy[k] = v
            end
          end

          socket:write(proxy)

          if proxy.type == 'monitor' then
            peripheral.eventChannel = function(...)
              socket:write({
                fn = 'event',
                data = { ... }
              })
            end
          end

          while true do
            local data = socket:read()
            if not data then
              print('peripheral: lost connection from ' .. socket.dhost)
              break
            end
            if not _G.device[peripheral.name] then
              print('periperal: detached')
              socket:close()
              break
            end
            if peripheral[data.fn] then
              socket:write({ peripheral[data.fn](table.unpack(data.args)) })
            end
          end

          peripheral.eventChannel = nil
          peripheral.fastBlit = nil
        end
      end
    end)
  end
end)