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- local serial = require "serialization"
- local minitel = require "minitel"
- local event = require "event"
- local rpc = {}
- _G.rpcf = {}
- rpc.port = 111
-
- local function setacl(self, fname, host)
- self[fname] = self[fname] or {}
- self[fname][host] = true
- end
- -- function rpc.allow(fn, host) -- string string -- -- Enable the allow list for function *fname* and add *host* to it.
- -- function rpc.deny(fn, host) -- string string -- -- Enable the deny list for function *fname* and add *host* to it.
- rpc.allow = setmetatable({},{__call=setacl})
- rpc.deny = setmetatable({},{__call=setacl})
-
- local function isPermitted(host,fn)
- if rpc.allow[fn] then
- return rpc.allow[fn][host] or false
- end
- if rpc.deny[fn] and rpc.deny[fn][host] then
- return false
- end
- return true
- end
-
- local function rpcexec(_, from, port, data)
- if port ~= rpc.port then return false end
- os.spawn(function()
- local rpcrq = serial.unserialize(data) or {}
- if rpcf[rpcrq[1]] and isPermitted(from,rpcrq[1]) then
- os.setenv("RPC_CLIENT",from)
- minitel.send(from,port,serial.serialize({rpcrq[2],pcall(rpcf[rpcrq[1]],table.unpack(rpcrq,3))}))
- elseif type(rpcrq[2]) == "string" then
- minitel.send(from,port,serial.serialize({rpcrq[2],false,"function unavailable"}))
- end
- end,"rpc worker for "..tostring(from))
- end
- function rpcf.list()
- local rt = {}
- for k,v in pairs(rpcf) do
- rt[#rt+1] = k
- end
- return rt
- end
-
- function rpc.call(hostname,fn,...) -- string string -- boolean -- Calls exported function *fn* on host *hostname*, with parameters *...*, returning whatever the function returns, or false.
- if hostname == "localhost" then
- return rpcf[fn](...)
- end
- local rv = minitel.genPacketID()
- minitel.rsend(hostname,rpc.port,serial.serialize({fn,rv,...}),true)
- local st = computer.uptime()
- local rt = {}
- repeat
- local _, from, port, data = event.pull(30, "net_msg", hostname, rpc.port)
- rt = serial.unserialize(tostring(data)) or {}
- until (type(rt) == "table" and rt[1] == rv) or computer.uptime() > st + 30
- if rt[1] == rv then
- if rt[2] then
- return table.unpack(rt,3)
- end
- error(rt[3])
- end
- error("timed out")
- end
- function rpc.proxy(hostname,filter) -- string string -- table -- Returns a component.proxy()-like table from the functions on *hostname* with names matching *filter*.
- filter=(filter or "").."(.+)"
- local fnames = rpc.call(hostname,"list")
- if not fnames then return false end
- local rt = {}
- for k,v in pairs(fnames) do
- fv = v:match(filter)
- if fv then
- rt[fv] = function(...)
- return rpc.call(hostname,v,...)
- end
- end
- end
- return rt
- end
- function rpc.register(name,fn) -- string function -- -- Registers a function to be exported by the RPC library.
- local rpcrunning = false
- for k,v in pairs(os.tasks()) do
- if os.taskInfo(v).name == "rpc daemon" then
- rpcrunning = true
- end
- end
- if not rpcrunning then
- os.spawn(function()
- while true do
- pcall(rpcexec,event.pull("net_msg"))
- end
- end,"rpc daemon")
- end
- rpcf[name] = fn
- end
-
- function rpc.unregister(name) -- string -- -- Removes a function from the RPC function registry, clearing any ACL rules.
- rpcf[name] = nil
- rpc.allow[name] = nil
- rpc.deny[name] = nil
- end
-
- return rpc
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