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Luvit像Node.js一样写Lua应用

先问个问题:如果你是一个Lua开发者,手头刚好有异步I/O的需求,你会怎么办?传统方案当然有,但要说最接近Node.js体验的,还得是Luvit。简单来说,它就是Lua界的Node.js——把Lua和libUV撮合在一起,再加上JIT加持,用项目自己的话说:Lua + libUV + JIT = p

先问个问题:如果你是一个Lua开发者,手头刚好有异步I/O的需求,你会怎么办?传统方案当然有,但要说最接近Node.js体验的,还得是Luvit。简单来说,它就是Lua界的Node.js——把Lua和libUV撮合在一起,再加上JIT加持,用项目自己的话说:Lua + libUV + JIT = pu re awesomesauce。在Gitlab上,这段描述说得明明白白。

概要信息

安装

官方提供了安装脚本,一键搞定,不过版本不一定最新。如果你非要追新,那就老老实实从源码编译吧。

curl -L https://github.com/luvit/lit/raw/master/get-lit.sh | sh

安装日志

[root@kong ~]# curl -L https://github.com/luvit/lit/raw/master/get-lit.sh | sh
 % Total  % Received % Xferd A verage Speed  Time  Time   Time Current
                 Dload Upload  Total  Spent  Left Speed
100  127 100  127  0   0   57   0 0:00:02 0:00:02 --:--:--  57
100  567 100  567  0   0  192   0 0:00:02 0:00:02 --:--:-- 1788
Downloading https://github.com/luvit/luvi/releases/download/v2.7.6/luvi-regular-Linux_x86_64 to luvi
 % Total  % Received % Xferd A verage Speed  Time  Time   Time Current
                 Dload Upload  Total  Spent  Left Speed
100  615  0  615  0   0  280   0 --:--:-- 0:00:02 --:--:--  280
100 4261k 100 4261k  0   0  481k   0 0:00:08 0:00:08 --:--:-- 1007k
Downloading https://lit.luvit.io/packages/luvit/lit/v3.5.4.zip to lit.zip
 % Total  % Received % Xferd A verage Speed  Time  Time   Time Current
                 Dload Upload  Total  Spent  Left Speed
100 234k 100 234k  0   0 91459   0 0:00:02 0:00:02 --:--:-- 91488
lit version: 3.5.4
luvi version: v2.7.6
command: make lit.zip lit luvi
create config: /root/.litconfig
compiling filter: ** excludes by default (first rule is positive)
including: commands/README
including: commands/add.lua
including: commands/auth.lua
including: commands/claim.lua
including: commands/config.lua
including: commands/down.lua
including: commands/get-luvi.lua
including: commands/help.lua
including: commands/init.lua
including: commands/install.lua
including: commands/ls.lua
including: commands/make.lua
including: commands/publish.lua
including: commands/serve.lua
including: commands/share.lua
including: commands/sync.lua
including: commands/unclaim.lua
including: commands/up.lua
including: commands/update.lua
including: init.lua
including: libs/api.lua
including: libs/auto-updater.lua
including: libs/autoconfig.lua
including: libs/calculate-deps.lua
including: libs/codec.lua
including: libs/core.lua
including: libs/db-fs.lua
including: libs/db.lua
including: libs/exec.lua
including: libs/export-zip.lua
including: libs/export.lua
including: libs/get-installed.lua
including: libs/github-request.lua
including: libs/handlers.lua
including: libs/import.lua
including: libs/install-deps.lua
including: libs/log.lua
including: libs/metrics.lua
including: libs/pkg.lua
including: libs/rdb.lua
including: libs/rules.lua
including: libs/snapshots.lua
including: libs/stats.lua
including: libs/verify-signature.lua
including: libs/vfs.lua
including: luvit-loader.lua
including: main.lua
including: package.lua
including dependency: base64 (deps/base64.lua)
including dependency: coro-channel (deps/coro-channel.lua)
including dependency: coro-fs (deps/coro-fs.lua)
including dependency: coro-http (deps/coro-http.lua)
including dependency: coro-net (deps/coro-net.lua)
including dependency: coro-spawn (deps/coro-spawn.lua)
including dependency: coro-split (deps/coro-split.lua)
including dependency: coro-websocket (deps/coro-websocket.lua)
including dependency: coro-wrapper (deps/coro-wrapper.lua)
including dependency: git (deps/git/)
including dependency: http-codec (deps/http-codec.lua)
including dependency: json (deps/json.lua)
including dependency: md5 (deps/md5.lua)
including dependency: pathjoin (deps/pathjoin.lua)
including dependency: pretty-print (deps/pretty-print.lua)
including dependency: prompt (deps/prompt.lua)
including dependency: querystring (deps/querystring.lua)
including dependency: readline (deps/readline.lua)
including dependency: resource (deps/resource.lua)
including dependency: secure-socket (deps/secure-socket/)
including dependency: semver (deps/semver.lua)
including dependency: sha1 (deps/sha1.lua)
including dependency: ssh-rsa (deps/ssh-rsa.lua)
including dependency: ustring (deps/ustring.lua)
including dependency: weblit-app (deps/weblit-app.lua)
including dependency: weblit-auto-headers (deps/weblit-auto-headers.lua)
including dependency: weblit-websocket (deps/weblit-websocket.lua)
including dependency: websocket-codec (deps/websocket-codec.lua)
compiling filter: deps/git/** excludes by default (first rule is positive)
including: core.lua
including: db.lua
including: init.lua
including: package.lua
including: storage.lua
creating binary: /root/lit
using luvi from: /root/luvi
inserting luvi: /root/luvi
storing: commands/add.lua
compiling: commands/auth.lua (9.9% reduction)
storing: commands/claim.lua
storing: commands/config.lua
storing: commands/down.lua
compiling: commands/get-luvi.lua (20.7% reduction)
storing: commands/help.lua
compiling: commands/init.lua (14.9% reduction)
storing: commands/install.lua
compiling: commands/ls.lua (2.6% reduction)
storing: commands/make.lua
storing: commands/publish.lua
compiling: commands/serve.lua (19% reduction)
storing: commands/share.lua
storing: commands/sync.lua
storing: commands/unclaim.lua
storing: commands/up.lua
compiling: commands/update.lua (23.3% reduction)
compiling: deps/base64.lua (29.2% reduction)
compiling: deps/coro-channel.lua (19.7% reduction)
storing: deps/coro-fs.lua
compiling: deps/coro-http.lua (30.4% reduction)
compiling: deps/coro-net.lua (18.5% reduction)
compiling: deps/coro-spawn.lua (44% reduction)
compiling: deps/coro-websocket.lua (34.6% reduction)
compiling: deps/coro-wrapper.lua (66.1% reduction)
compiling: deps/git/core.lua (3.4% reduction)
compiling: deps/git/db.lua (18.7% reduction)
storing: deps/git/init.lua
storing: deps/git/package.lua
compiling: deps/git/storage.lua (34.5% reduction)
compiling: deps/http-codec.lua (37.2% reduction)
compiling: deps/json.lua (30.7% reduction)
storing: deps/md5.lua
compiling: deps/pathjoin.lua (33.5% reduction)
compiling: deps/pretty-print.lua (30.4% reduction)
compiling: deps/prompt.lua (43.4% reduction)
compiling: deps/querystring.lua (35.9% reduction)
compiling: deps/readline.lua (18.6% reduction)
compiling: deps/resource.lua (31.5% reduction)
compiling: deps/secure-socket/biowrap.lua (31.8% reduction)
compiling: deps/secure-socket/context.lua (27.4% reduction)
compiling: deps/secure-socket/init.lua (52.5% reduction)
storing: deps/secure-socket/package.lua
compiling: deps/semver.lua (28.2% reduction)
compiling: deps/sha1.lua (27.9% reduction)
compiling: deps/ssh-rsa.lua (16.2% reduction)
compiling: deps/ustring.lua (37.1% reduction)
compiling: deps/weblit-app.lua (14.8% reduction)
compiling: deps/weblit-auto-headers.lua (50.9% reduction)
compiling: deps/weblit-websocket.lua (35.8% reduction)
compiling: deps/websocket-codec.lua (18.2% reduction)
storing: init.lua
compiling: libs/api.lua (30.9% reduction)
compiling: libs/auto-updater.lua (29% reduction)
compiling: libs/autoconfig.lua (32.3% reduction)
compiling: libs/calculate-deps.lua (30.4% reduction)
compiling: libs/codec.lua (31.2% reduction)
compiling: libs/core.lua (14% reduction)
compiling: libs/db-fs.lua (29.5% reduction)
compiling: libs/db.lua (38.2% reduction)
compiling: libs/exec.lua (45.1% reduction)
compiling: libs/export-zip.lua (36.4% reduction)
compiling: libs/export.lua (36.6% reduction)
compiling: libs/get-installed.lua (45.9% reduction)
compiling: libs/github-request.lua (49.8% reduction)
compiling: libs/handlers.lua (18.1% reduction)
compiling: libs/import.lua (27.6% reduction)
compiling: libs/install-deps.lua (38.4% reduction)
compiling: libs/log.lua (60.7% reduction)
compiling: libs/metrics.lua (56.8% reduction)
compiling: libs/pkg.lua (36.9% reduction)
compiling: libs/rdb.lua (22.2% reduction)
compiling: libs/rules.lua (29.7% reduction)
compiling: libs/snapshots.lua (12.6% reduction)
compiling: libs/stats.lua (1.5% reduction)
compiling: libs/verify-signature.lua (40.8% reduction)
compiling: libs/vfs.lua (29.9% reduction)
compiling: luvit-loader.lua (29.8% reduction)
compiling: main.lua (24.3% reduction)
compiling: package.lua (14.8% reduction)
done building: /root/lit
done: success
lit version: 3.5.4
luvi version: v2.7.6
command: make lit://luvit/luvit luvit luvi
load config: /root/.litconfig
connecting: wss://lit.luvit.io/
fetching: 1 object
fetching: 1 object
fetching: 4 objects
using snapshot: ab0b6ace5a16a88e6fbb4c8da0083c40cf1d6803
creating binary: /root/luvit
using luvi from: /root/luvi
fetching: 1 object
fetching: 1 object
fetching: 27 objects
fetching: 16 objects
inserting luvi: /root/luvi
compiling: deps/buffer.lua (16.5% reduction)
compiling: deps/childprocess.lua (19.1% reduction)
compiling: deps/codec.lua (35.3% reduction)
compiling: deps/core.lua (57.3% reduction)
compiling: deps/dgram.lua (25.5% reduction)
compiling: deps/dns.lua (25.1% reduction)
compiling: deps/fs.lua (6.2% reduction)
compiling: deps/helpful.lua (42.7% reduction)
compiling: deps/hooks.lua (83.3% reduction)
compiling: deps/http-codec.lua (37.4% reduction)
compiling: deps/http-header.lua (59.4% reduction)
compiling: deps/http.lua (29.6% reduction)
compiling: deps/https.lua (45.6% reduction)
compiling: deps/json.lua (30.7% reduction)
compiling: deps/los.lua (76.9% reduction)
compiling: deps/net.lua (13.9% reduction)
compiling: deps/path/base.lua (24.9% reduction)
compiling: deps/path/init.lua (49.7% reduction)
storing: deps/path/package.lua
compiling: deps/pathjoin.lua (33.5% reduction)
compiling: deps/pretty-print.lua (30.6% reduction)
compiling: deps/process.lua (17.2% reduction)
compiling: deps/querystring.lua (35.9% reduction)
compiling: deps/readline.lua (18.6% reduction)
compiling: deps/repl.lua (28.2% reduction)
compiling: deps/require.lua (24.6% reduction)
compiling: deps/resource.lua (31.5% reduction)
compiling: deps/stream/init.lua (55.6% reduction)
storing: deps/stream/package.lua
compiling: deps/stream/stream_core.lua (38.5% reduction)
compiling: deps/stream/stream_duplex.lua (49.7% reduction)
compiling: deps/stream/stream_observable.lua (50.8% reduction)
compiling: deps/stream/stream_passthrough.lua (65.3% reduction)
compiling: deps/stream/stream_readable.lua (48.2% reduction)
compiling: deps/stream/stream_transform.lua (62% reduction)
compiling: deps/stream/stream_writable.lua (43% reduction)
compiling: deps/thread.lua (38.6% reduction)
compiling: deps/timer.lua (24% reduction)
compiling: deps/tls/common.lua (14.9% reduction)
compiling: deps/tls/init.lua (26.1% reduction)
compiling: deps/tls/lcrypto.lua (46.8% reduction)
compiling: deps/tls/package.lua (2.6% reduction)
compiling: deps/url.lua (32.8% reduction)
compiling: deps/ustring.lua (37.5% reduction)
compiling: deps/utils.lua (39.7% reduction)
compiling: init.lua (43.5% reduction)
compiling: main.lua (21.6% reduction)
compiling: package.lua (21.1% reduction)
storing: test.lua
done building: /root/luvit
done: success
[root@kong ~]#

安装结果确认

[root@kong ~]# ./lit --version
lit version: 3.5.4
luvi version: v2.7.6
[root@kong ~]# ./luvi --version
./luvi v2.7.6
rex: 8.37 2015-04-28
libuv: 1.9.1
ssl: OpenSSL 1.0.2h 3 May 2016, lua-openssl 0.5.1
[root@kong ~]# ./luvit --version
luvit version: 2.14.2
luvi version: v2.7.6
rex version: 8.37 2015-04-28
libuv version: 1.9.1
ssl version: OpenSSL 1.0.2h 3 May 2016, lua-openssl 0.5.1
[root@kong ~]#

拷贝至PATH搜索目录

[root@kong ~]# cp lit /usr/local/bin
[root@kong ~]# cp luvi /usr/local/bin
[root@kong ~]# cp luvit /usr/local/bin
[root@kong ~]# 
[root@kong ~]# which luvi
/usr/local/bin/luvi
[root@kong ~]# which lit
/usr/local/bin/lit
[root@kong ~]# which luvit
/usr/local/bin/luvit
[root@kong ~]#

Lua界的Node.js

看完安装,来看看它到底有多像Node.js。一个标准的Node.js HelloWorld是这样的:

var http = require('http');
http.createServer(function (req, res) {
 var body = 'Hello worldn';
 res.setHeader('Content-Type', 'text/plain');
 res.setHeader('Content-Length', body.length);
 res.end(body);
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');

而Luvit的版本几乎就是一模一样的翻译:

[root@kong ~]# cat server.lua 
local http = require('http')
http.createServer(function (req, res)
 local body = 'Hello worldn'
 res:setHeader('Content-Type', 'text/plain')
 res:setHeader("Content-Length", #body)
 res:finish(body)
end):listen(1337, '127.0.0.1')
print('Server running at http://127.0.0.1:1337/')
[root@kong ~]#

运行结果为:

[root@kong ~]# luvit server.lua
Server running at http://127.0.0.1:1337/

确认结果:

[root@kong ~]# curl http://localhost:1337
Hello world
[root@kong ~]#

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赤友清理大师是一款为 Mac 设计的智能清理优化工具,可精准扫描垃圾、大文件、重复文件等,释放磁盘空间。做扫描整理、文字提取和表格转换时,它能把识别后的处理步骤接得更顺,资料录入这类场景会省下不少时间。

极度公式
极度公式
Windows/macOS/Linux

极度公式是一款跨平台专业LaTeX公式识别编辑软件,支持OCR公式识别和多平台编辑。和使用说明,避免使用,享受完整功能与稳定支持。做扫描整理、文字提取和表格转换时,它能把识别后的处理步骤接得更顺,资料录入这类场景会省下不少时间。

WINDOWS 更多
Windows 10
Windows 10
Windows

Windows 10 是一款微软推出的经典操作系统,拥有硬件兼容性与多任务处理能力。它更偏向把系统状态查看和常用调节动作放在一起,适合需要持续观察和微调设备状态的场景。

极度公式
极度公式
Windows/macOS/Linux

极度公式是一款跨平台专业LaTeX公式识别编辑软件,支持OCR公式识别和多平台编辑。和使用说明,避免使用,享受完整功能与稳定支持。做扫描整理、文字提取和表格转换时,它能把识别后的处理步骤接得更顺,资料录入这类场景会省下不少时间。

密码键盘
密码键盘
Windows/macOS/iOS/Android

密码键盘是一款兼具安全性与便捷性的高效密码管理器。日常使用里的持续防护和信息管理会更突出,适合把安全控制放进长期使用流程中的场景。