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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, TBOOX Open Source Group.
--
-- @author ruki
-- @file fwatcher.lua
--
-- define module: fwatcher
local fwatcher = fwatcher or {}
local _instance = _instance or {}
-- load modules
local string = require("base/string")
local coroutine = require("base/coroutine")
local scheduler = require("base/scheduler")
-- save original interfaces
fwatcher._open = fwatcher._open or fwatcher.open
fwatcher._add = fwatcher._add or fwatcher.add
fwatcher._remove = fwatcher._remove or fwatcher.remove
fwatcher._wait = fwatcher._wait or fwatcher.wait
fwatcher._close = fwatcher._close or fwatcher.close
-- the fwatcher event type, @see tbox/platform/fwatcher.h
fwatcher.ET_MODIFY = 1
fwatcher.ET_CREATE = 2
fwatcher.ET_DELETE = 4
-- get cdata of fwatcher
function _instance:cdata()
local cdata = self._CDATA
if not cdata and not self._CLOSED then
cdata = fwatcher._open()
self._CDATA = cdata
end
return cdata
end
-- get poller object type, poller.OT_FWATCHER
function _instance:otype()
return 4
end
-- add watch directory, e.g. {recursion = true}
function _instance:add(watchdir, opt)
-- ensure opened
local ok, errors = self:_ensure_opened()
if not ok then
return false, errors
end
-- add watchdir
opt = opt or {}
local ok, errors = fwatcher._add(self:cdata(), watchdir, opt.recursion or false)
if not ok then
errors = string.format("<fwatcher>: add %s failed, %s", watchdir, errors or "unknown errors")
end
return ok, errors
end
-- remove watch directory
function _instance:remove(watchdir)
-- ensure opened
local ok, errors = self:_ensure_opened()
if not ok then
return false, errors
end
-- remove watchdir
opt = opt or {}
local ok, errors = fwatcher._remove(self:cdata(), watchdir)
if not ok then
errors = string.format("<fwatcher>: remove %s failed, %s", watchdir, errors or "unknown errors")
end
return ok, errors
end
-- wait event
--
-- @param timeout the timeout
--
-- @return ok, event, e.g {type = fwatcher.ET_MODIFY, path = "/tmp"}
--
function _instance:wait(timeout)
-- ensure opened
local ok, errors = self:_ensure_opened()
if not ok then
return -1, errors
end
-- wait events
local result = -1
local event_or_errors = nil
if scheduler:co_running() then
result, event_or_errors = scheduler:poller_waitfs(self, timeout or -1)
else
result, event_or_errors = fwatcher._wait(self:cdata(), timeout or -1)
end
if result < 0 and event_or_errors then
event_or_errors = string.format("<fwatcher>: wait failed, %s", event_or_errors)
end
return result, event_or_errors
end
-- close instance
function _instance:close()
-- ensure opened
local ok, errors = self:_ensure_opened()
if not ok then
return false, errors
end
-- cancel pipe events from the scheduler
if scheduler:co_running() then
ok, errors = scheduler:poller_cancel(self)
if not ok then
return false, errors
end
end
-- close fwatcher
ok = fwatcher._close(self:cdata())
if ok then
self._CDATA = nil
self._CLOSED = true
end
return ok
end
-- ensure the fwatcher is opened
function _instance:_ensure_opened()
if not self:cdata() then
return false, string.format("%s: has been closed!", self)
end
return true
end
function fwatcher.add(watchdir, opt)
return _instance:add(watchdir, opt)
end
function fwatcher.remove(watchdir)
return _instance:remove(watchdir)
end
function fwatcher.wait(timeout)
return _instance:wait(timeout)
end
return fwatcher
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