測試redis分散式鎖

阿新 • • 發佈：2020-12-14

前言

首先介紹下在本文出現的幾個比較重要的概念：

函式計算（Function Compute）:函式計算是一個事件驅動的服務，通過函式計算，使用者無需管理伺服器等執行情況，只需編寫程式碼並上傳。函式計算準備計算資源，並以彈性伸縮的方式執行使用者程式碼，而使用者只需根據實際程式碼執行所消耗的資源進行付費。函式計算更多資訊參考。

Fun: Fun 是一個用於支援 Serverless 應用部署的工具，能幫助您便捷地管理函式計算、API 閘道器、日誌服務等資源。它通過一個資源配置檔案（template.yml），協助您進行開發、構建、部署操作。Fun 的更多文件參考。

備註: 本文介紹的技巧需要 Fun 版本大於等於 3.5.0。

依賴工具

本專案是在 MacOS 下開發的，涉及到的工具是平臺無關的，對於 Linux 和 Windows 桌面系統應該也同樣適用。在開始本例之前請確保如下工具已經正確地安裝，更新到最新版本，並進行正確的配置。

Docker
Fun

Fun 工具依賴於 docker 來模擬本地環境。

MacOS 使用者可以使用homebrew進行安裝：

brew cask install docker
brew tap vangie/formula
brew install fun

Windows 和 Linux 使用者安裝請參考：

https://github.com/aliyun/fun/blob/master/docs/usage/installation.md

https://github.com/aliyun/fcli/releases

安裝好後，記得先執行fun config初始化一下配置。

初始化

使用 fun init 命令可以快捷地將本模板專案初始化到本地。

fun init vangie/puppeteer-example

安裝依賴

fun install

fun install會執行 Funfile 檔案裡的指令，依次執行如下任務：

安裝 chrome headless 二進位制檔案；
安裝 puppeteer 依賴的 apt 包；
安裝 npm 依賴。

部署

同步大檔案到 nas 盤。

fun nas sync

部署程式碼。

$ fun deploy
using template: template.yml
using region: cn-hangzhou
using accountId: ***********3743
using accessKeyId: ***********Ptgk
using timeout: 600

Waiting for service puppeteer to be deployed...
        make sure role 'aliyunfcgeneratedrole-cn-hangzhou-puppeteer' is exist
        role 'aliyunfcgeneratedrole-cn-hangzhou-puppeteer' is already exist
        attaching police 'AliyunECSNetworkInterfaceManagementAccess' to role: aliyunfcgeneratedrole-cn-hangzhou-puppeteer
        attached police 'AliyunECSNetworkInterfaceManagementAccess' to role: aliyunfcgeneratedrole-cn-hangzhou-puppeteer
        using 'VpcConfig: Auto', Fun will try to generate related vpc resources automatically
                vpc already generated, vpcId is: vpc-bp1wv9al02opqahkizmvr
                vswitch already generated, vswitchId is: vsw-bp1kablus0jrcdeth8v35
                security group already generated, security group is: sg-bp1h2swzeb5vgjfu6gpo
        generated auto VpcConfig done:  {"vpcId":"vpc-bp1wv9al02opqahkizmvr","vswitchIds":["vsw-bp1kablus0jrcdeth8v35"],"securityGroupId":"sg-bp1h2swzeb5vgjfu6gpo"}
        using 'NasConfig: Auto', Fun will try to generate related nas file system automatically
                nas file system already generated, fileSystemId is: 0825a4a395
                nas file system mount target is already created, mountTargetDomain is: 0825a4a395-rrf16.cn-hangzhou.nas.aliyuncs.com
        generated auto NasConfig done:  {"UserId":10003,"GroupId":10003,"MountPoints":[{"ServerAddr":"0825a4a395-rrf16.cn-hangzhou.nas.aliyuncs.com:/puppeteer","MountDir":"/mnt/auto"}]}
        Checking if nas directories /puppeteer exists, if not, it will be created automatically
        Checking nas directories done ["/puppeteer"]
        Waiting for function html2png to be deployed...
                Waiting for packaging function html2png code...
                The function html2png has been packaged. A total of 7 files files were compressed and the final size was 2.56 KB
                Waiting for HTTP trigger httpTrigger to be deployed...
                triggerName: httpTrigger
                methods: [ 'GET' ]
                url: https://xxxxxx.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/puppeteer/html2png/
                Http Trigger will forcefully add a 'Content-Disposition: attachment' field to the response header, which cannot be overwritten 
                and will cause the response to be downloaded as an attachment in the browser. This issue can be avoided by using CustomDomain.

                trigger httpTrigger deploy success
        function html2png deploy success
service puppeteer deploy success


===================================== Tips for nas resources ==================================================
Fun has detected the .nas.yml file in your working directory, which contains the local directory:

        /Users/vangie/Workspace/puppeteer-example/{{ projectName }}/.fun/root
        /Users/vangie/Workspace/puppeteer-example/{{ projectName }}/node_modules
  
The above directories will be automatically ignored when 'fun deploy'.
Any content of the above directories changes，you need to use 'fun nas sync' to sync local resources to remote.
===============================================================================================================

驗證

curl https://xxxxxx.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/puppeteer/html2png/ > screenshot.png

如果不傳遞查詢引數，預設會擷取阿里雲的首頁：

如果想換一個網址，可以使用如下命令格式：

curl https://xxxxxx.cn-hangzhou.fc.aliyuncs.com/2016-08-15/proxy/puppeteer/html2png/?url=http://www.alibaba.com > screenshot.png

除錯

如果需要在本地除錯程式碼，可以使用如下命令：

$ fun local start
using template: template.yml
HttpTrigger httpTrigger of puppeteer/html2png was registered
        url: http://localhost:8000/2016-08-15/proxy/puppeteer/html2png
        methods: [ 'GET' ]
        authType: ANONYMOUS


function compute app listening on port 8000!

瀏覽器開啟http://localhost:8000/2016-08-15/proxy/puppeteer/html2png即可。