麥特不戴蒙

2019年5月29日星期三

安裝 npm forever 會遇到的小問題

安裝 forever
npm install forever -g
接著 forever start your_node_code.js
就可以在背景一直執行(不會因為terminal 關閉而結束)

但是有可能會遇到 forever: command not found 的問題

這時候的解決方法就是想辦法找到你的 forever 被安裝在哪裡，然後用 ln 的方式導到你的 /usr/bin/ 下使用

以我的例子
先用 npm get prefix 找到npm 的位置
/volume1/@appstore/Node.js_v8/usr/local

然後發現forever package其實被安裝在
/volume1/@appstore/Node.js_v8/usr/local/lib/node_modules/forever/bin/forever

於是我們將它link起來以便隨地使用
sudo ln -s /volume1/\@appstore/Node.js_v8/usr/local/lib/node_modules/forever/bin/forever /usr/bin/forever

收工

後記。
發現有可能把 $PATH 加入即可
export PATH=$PATH:/volume1/@appstore/Node.js_v8/usr/local/bin

2019年5月25日星期六

Using Linux Crontab example

If you want to execute some task in every 5 minutes?
如果想在 Linux 中定時執行某些任務？

crontab -l    // see the list of crontab
crontab -e    // edit current crontab

Example situations: Sync up system time every 5 minutes.
Create a file /root/synctime.sh and set 775, the synctime.sh execute your update logic then which execute every 5 mins

*/5 * * * * /root/synctime.sh

Here is a online crontab exerciser (這裡有個線上 crontab 的練習器)
https://crontab.guru/every-weekday

2019年5月6日星期一

[Git] 在 TortoiseGit 裡記憶專案密碼

也許你也覺得每次 pull/push 程式碼就要重新輸入一次密碼好煩？來，以下教你如何用 TortoiseGit 記憶專案密碼。

1。首先，右鍵點選專案裡的 [Settings]

2。移到 Credential 頁面，Config Type 選擇 Local，然後填入你 Repository 的 URL，Helper是指認真的工具，在此選 manager，將會以微軟內建對話框詢問。(若忘記專案網址，可用指令查詢： git config --get remote.origin.url

就這麼簡單。

2018年10月18日星期四

Deploy A React App Website With React-Router To Synology WebStation By Nginx (部署含有 React-Router 的網站到 Synology WebStation，以 Nginx為例)

When we deploy a simple ReactJS website to Synology WebStation, the easy way is put the built files into default web folder.

Assuming the site URL is http://www.example.com/

However, there is a problem when we want to access http://www.example.com/category1/ will bring 404 or 403 error.

Because React-Router is a SPA(single-page-application) project, all URL switch need start from index.html.

To fix this issue, I do a experiment with Nginx Server.

My Synology NAS model is DS415+, before the experiment, it need to prepared following:
1. Install Node.js
2. Enable SSH function on NAS

Step.1 is easy, just like this:

Install Node.js via Synology Package Center

Step.2 Enable SSH port in firewall rules.

Enable SSH port

Step.3 Create a virtual Host in Web Station

Step.4 Create a Virtual Host

Setting to Virtual Host

Notice the "Document root" means the root of your web folder.

Step.5 Login NAS via SSH

Okay, let's log in NAS via your terminal, in here I manipulate with Cygwin console.

ssh -p {your_ssh_port} {your_account_name}@{your_NAS_ip}

Then edit file /etc/nginx/app.d/server.webstation-vhost.conf with root

root@NAS:/volume1/web/code/build# vi /etc/nginx/app.d/server.webstation-vhost.conf

Add this slice in file:

location / {
        root /volume1/web/code/build;
        index index.html;
        try_files $uri /index.html;
}

It means we try to redirect any other URI to index.html, that will make React-Router work!
Save it and reload Nginx.

root@NAS:/volume1/web/code/build# nginx -s reload

Now your website should work perfect with React-Router.

But .......

The Synology Nginx always reset this config to default after reboot. We need to add a routine task to check if file changed.

Step.6 Create a routine task
First, make a copy of certainly file server.webstation-vhost.conf to other position you like, in my case, I copy it to /volume1/web/server.webstation-vhost.conf

Start to create a task.

Then check files diff every minute or 5 minutes, it up to you.

The script code:

syn_conf=/etc/nginx/app.d/server.webstation-vhost.conf
ok_conf=/volume1/web/server.webstation-vhost.conf
syn_filesize=`ls -l $syn_conf | awk '{ print $5 }'`
ok_filesize=`ls -l $ok_conf | awk '{ print $5 }'`
if [ $syn_filesize -ne $ok_filesize ];  then cp $ok_conf $syn_conf; sudo nginx -s reload; fi

Remember to run task after create

Reference:
[1] https://www.jianshu.com/p/51ba2bec00c7
[2] https://tklab.club/synology-dsm-nginx-wordpress
[3] https://blog.oldghost.net:888/synology-reverse-proxy-usage.html

#SynologyNAS
#WebStation
#VirtualHost
#ReactJS
#ReactRouter

2018年10月1日星期一

React refs example

class Parent extends React.Component {
   callChildFunction = () => {
       this.child.handleActionParent();  ///calling a child function here
  } 
   render(){
      return (
           <div>
           {/* other things */}
           <Child ref={(cd) => this.child = cd}/>
           </div>
      )
    }
}

class Child extends React.Component {
   handleActionParent = () => {
       console.log('called from parent')
   }
   render() {
      return (
           {/*...*/}
      )
   }
}

2018年9月28日星期五

[JavaScript] Convert Byte to other size, Byte轉換

  bytesConvertToSize = (bytes) => {
    let sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
    if (bytes === 0)
        return '0 Bytes';

    let i = Math.floor(Math.log(bytes) / Math.log(1024));
    return +(Math.round(bytes / Math.pow(1024, i) + "e+2") + "e-2") + ' ' + sizes[i];

    // 下行會有尾數為 0 的狀況，因此改另一方法
    // With problem 123.499 will be 123.50 KB,
    // return (bytes / Math.pow(1024, i)).toFixed(2) + ' ' + sizes[i];

  }

2018年1月23日星期二

Fix WebStorm unresolved function for jest and enzyme methods

Refer from:
Get rid of "Unresolved function/method/variable" warning in Jest test files

2017年12月7日星期四

保哥教你如何讓 windows command 變好看 (How to have good looking Windows Command Prompt)

保哥教你如何讓 windows command 變好看

[保哥部落格連結]
https://blog.miniasp.com/post/2017/12/06/Microsoft-YaHei-Mono-Chinese-Font-for-Command-Prompt-and-WSL.aspx

[臉書連結，下面有討論]

https://www.facebook.com/will.fans/posts/1908557939173341

[保哥 Github]

https://github.com/doggy8088/MicrosoftYaHeiMono-CP950

直接下載

https://github.com/doggy8088/MicrosoftYaHeiMono-CP950/blob/master/MicrosoftYaHeiMono-CP950.ttf?raw=true

Win7 使用方法

1. 下載字型後安裝

2. 修改 HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Console\TrueTypeFont

新增 REG_SZ, "950xxx" = "Microsoft YaHei Mono"

(xxx 為任意字元, 第一個 x 不能為數字)

ps. 我自己是用 950a11

3. 在 cmd 視窗上選擇預設值

4. 選擇 Microsoft YaHei Mono

就大功告成啦！十分感謝 Will 保哥的教學，在此膜拜他一下。

2017年11月6日星期一

MircoSD Card General Recommendations 使用與保存方法

General Recommendations

1. There are counterfeit memory cards out there. Buying from a reputable retailer helps minimize the risk of getting a fake.
(市面上充斥許多偽卡，請向可靠的商家購買記憶卡以降低買到偽卡風險。)
2. Memory cards are complicated electronic products. A small percentage of electronic products end up being faulty from the manufacturing process. So it’s good practice to test your card before using it in a mission critical application. Better yet, have spare/s as backup.
(記憶卡為複雜的電子產品，有小部份的機率的產品會在製造過程損壞。因此建議在使用記憶卡前要先進行完整的測試；而更好的做法是勤勞地為它備份。)
3. Memory cards are not designed for long-term archival storage of photos and video. It’s good practice to download the data as soon as practical and get it backed up securely.
(記憶卡並非設計為長期備份的儲存載體，尤其是存儲照片和影片。較好的做法是在每次用完後儘快取出重要檔案並保持良好的備份習慣。)
4. Format the card in the camera rather than with your computer. It reduces the risk of formatting problems.
(請儘量使用相機或手機裝置進行格式化，而非先在電腦上進行，如此一來可降低格式化問題的風險。)

[1] Refs: Have Camera Will Travel: MicroSD Card Speed Tests