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-- Copyright 2009 Steven Barth <steven@midlink.org>
-- Licensed to the public under the Apache License 2.0.
local util = require "luci.util"
local json = require "luci.json"
local ltn12 = require "luci.ltn12"
local nixio = require "nixio", require "nixio.util"
local tostring, assert, setmetatable = tostring, assert, setmetatable
local error = error
--- LuCI RPC Client.
-- @cstyle instance
module "luci.rpcc"
RQLIMIT = 32 * nixio.const.buffersize
--- Create a new JSON-RPC stream client.
-- @class function
-- @param fd File descriptor
-- @param v1 Use protocol version 1.0
-- @return RPC Client
Client = util.class()
function Client.__init__(self, fd, v1)
self.fd = fd
self.uniqueid = tostring(self):match("0x([a-f0-9]+)")
self.msgid = 1
self.v1 = v1
end
--- Request an RP call and get the response.
-- @param method Remote method
-- @param params Parameters
-- @param notification Notification only?
-- @return response
function Client.request(self, method, params, notification)
local oldchunk = self.decoder and self.decoder.chunk
self.decoder = json.ActiveDecoder(self.fd:blocksource(nil, RQLIMIT))
self.decoder.chunk = oldchunk
local reqid = self.msgid .. self.uniqueid
local reqdata = json.Encoder({
id = (not notification) and (self.msgid .. self.uniqueid) or nil,
jsonrpc = (not self.v1) and "2.0" or nil,
method = method,
params = params
})
ltn12.pump.all(reqdata:source(), self.fd:sink())
if not notification then
self.msgid = self.msgid + 1
local response = self.decoder:get()
assert(response.id == reqid, "Invalid response id")
if response.error then
error(response.error.message or response.error)
end
return response.result
end
end
--- Create a transparent RPC proxy.
-- @param prefix Method prefix
-- @return RPC Proxy object
function Client.proxy(self, prefix)
prefix = prefix or ""
return setmetatable({}, {
__call = function(proxy, ...)
return self:request(prefix, {...})
end,
__index = function(proxy, name)
return self:proxy(prefix .. name .. ".")
end
})
end
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