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我想在我的 ngx_lua 程序中使用 lfs 模块，我从 github 下载源包并用 luajit2.0.3 编译它。静态文件位于 /usr/local/lib 中。我的 nginx.conf 的内容如下：

http {
    lua_shared_dict  my_cache 10m;
    lua_package_cpath '/usr/local/lib/lfs.so';

    init_worker_by_lua_file  'conf/cop/check1.lua';
    ...
}

check1.lua的内容如下：

local time_at = ngx.timer.at
local shared = ngx.shared
local log = ngx.log
local delay = 5
local ngx_err = ngx.ERR
local handler, updateip, checkfile
local my_cache = shared["my_cache"]
local filename = '/home/nginx/conf/cop/ip.txt'

local lfs = require "lfs"
local attribute = lfs.attribute

if not my_cache then
    log(ngx_err, "disappear the shared dict")
    return
end

checkfile = function (filename)
    local attr = attributes(filename)
    if attr then
        return attr.modification
    else
        return nil
    end
end

updateip = function (filename)
    my_cache:flush_all()
    local fp = io.open(filename, "r")
    if not fp then
        log(ngx_err, "failed to open file")
        return
    end
    for line in fp:lines() do
        my_cache:set(line, line)
    end
end

handler = function (premature, filename)
    -- do some routine job in Lua just like a cron job
    if premature then
        return
    end
    local mod
    local md5result, flags = my_cache:get("md5")
    if not md5result then
        mod = checkfile(filename)
        updateip(filename)
        my_cache:set("md5", mod)
    else
        mod = checkfile(filename)
        if mod ~= md5result then
            updateip(filename)
            my_cache:set("md5", mod)
        end
    end
    local ok, err = time_at(delay, handler, filename)
    if not ok then
        log(ngx_err, "failed to create the timer: ", err)
        return
    end
end

local ok, err = time_at(delay, handler, filename)
if not ok then
    log(ngx_err, "failed to create the timer: ", err)
    return
end

当我启动我的 nginx 时，发生了一些错误。内容如下：

2014/04/28 16:36:54 [error] 9437#0: lua entry thread aborted: runtime error: 

/home/nginx/conf/cop/check1.lua:22: attempt to call upvalue    'attributes' (a nil value) stack traceback: coroutine 0:
/home/nginx/conf/cop/check1.lua: in function 'checkfile'
/home/nginx/conf/cop/check1.lua:50: in function </home/nginx/conf/cop/check1.lua:42>, context: ngx.timer

我该怎么做呢？但是我用的是luajit命令行，没问题：

LuaJIT 2.0.3 -- Copyright (C) 2005-2014 Mike Pall. http://luajit.org/
JIT: ON CMOV SSE2 SSE3 SSE4.1 fold cse dce fwd dse narrow loop abc sink fuse
> lfs = require "lfs"
> attr = lfs.attributes('check1.lua')
> print(attr.modification)
1398678137
>
4

1 回答 1

1

Notice the following lines:

local attribute = lfs.attribute
.
.
.
checkfile = function (filename)
    local attr = attributes(filename)

You are creating the variable attribute from lfs.attribute instead of lfs.attributes. Also, you are later trying to call attributes instead of attribute.

Change the following

local attribute = lfs.attribute

to

local attributes = lfs.attributes
于 2014-04-28T10:05:42.313 回答