Await is a reserved word error

Solution:

In order to use await, the function directly enclosing it needs to be async.
example codes:

async tryGetUserName() {   let session = await Auth.currentSession();   ...... } 

async should be there, otherwise you will get the error.

Fix up: Can't Load URL: The domain of this URL isn't included in the app's domains.

Issue

Can't Load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.

Scenario

1. create a facebook app to get an appid
2. use that appid in website to initialized the facebook javascript SDK
3. use FB.ui to share content to facebook

full source codes

<!-- init facebook js sdk via your appid -->
<script>
  window.fbAsyncInit = function() {
    FB.init({
      appId            : 'yourappid',
      autoLogAppEvents : true,
      xfbml            : true,
      version          : 'v3.1'
    });
  };
  (function(d, s, id){
     var js, fjs = d.getElementsByTagName(s)[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement(s); js.id = id;
     js.src = "https://connect.facebook.net/en_US/sdk.js";
     fjs.parentNode.insertBefore(js, fjs);
   }(document, 'script', 'facebook-jssdk'));
</script>
<script>
function share() {
    // use FB.ui() to share content to facebook
    FB.ui(
      {
        method: 'share',
        href: 'urlyouwanttoshare',
      },
      // callback
      function(response) {
        if (response && !response.error_message) {
          alert('Posting completed.');
        } else {
          alert('Error while posting.');
        }
      }
    );
}
</script>

<button onclick="share()">share</button>

Solution

1.Go to your app in facebook developers page(Settings->Basic)
2.Scroll down and Click on Add platform, choose Web sites

3.Input your website domain
if you are testing via http://localhost:8080 then input http://localhost:8080
4.Save the changes
Then test again. you will find everything goes well.

Notes

App Domains is not working for web site share to facebook.
That might be used for mobile apps.

connect shadowsocks server on ubuntu via ss-local

#Server config
[Set up your own shadowsocks server](https://errong.win/2018/06/05/setup-shadowsocks-on-ubuntu-16-04/) or found/buy one.
You should have a shadowsocks server with below informations:
* server ip
* server port
* password
* method

#install
~~~
sudo apt-get install software-properties-common -y
sudo add-apt-repository ppa:max-c-lv/shadowsocks-libev -y
sudo apt-get update
sudo apt install shadowsocks-libev
~~~

#configure
match to the server's info.
~~~
sudo vim /etc/shadowsocks-libev/config.json
{
    "server":"xx.xx.xx.xx", // server IP
    "server_port":8911,
    "local_port":1008, // local port
    "password":"jesuslove",
    "timeout":60,
    "method":"chacha20-ietf-poly1305"
}
~~~

#run ss-local
```sudo ss-local -c  /etc/shadowsocks-libev/config.json```

#export socks proxy system wide
~~~
export http_proxy=socks5://127.0.0.1:1008
export https_proxy=socks5://127.0.0.1:1008
~~~

#use proxy extension set for chrome/firefox browser
config your proxy extension in your browser to use socks5 proxy
127.0.0.1:1008

c++: Max Heap Template

https://en.wikipedia.org/wiki/Min-max_heap
My simple implementation of max heap.
Change the compare from > to < in below codes, you will get a min heap.

template<typename T>
class MaxHeap {
public:
 MaxHeap() {
  size_ = 0;
  capacity_ = 2;
  heap_ = new T[capacity_];
 }
 MaxHeap(int capacity) {
  if (capacity >= 2) {
   heap_ = new T[capacity];
   capacity_ = capacity;
   size_ = 0;
  }
  else {
   size_ = 0;
   capacity_ = 2;
   heap_ = new T[capacity_];
  }
 }
 ~MaxHeap() {
  if (heap_)
   delete[] heap_;
 }
public:
 int size() { return size_; }
 void insert(const T& t) {
  if ((size_+1) >= capacity_) {
   capacity_ *= 2;
   T* tmp = new T[capacity_];
   for (int i = 0; i <= size_; i++)
    tmp[i] = heap_[i];
   delete[] heap_;
   heap_ = tmp;
  }
  size_++;
  heap_[size_] = t;
  int i = size_;
  int tmp = heap_[i];
  while (i > 1 && tmp > heap_[i / 2]) {
   heap_[i] = heap_[i / 2];
   heap_[i / 2] = tmp;
   tmp = heap_[i / 2];
   i /= 2;
  }
  heap_[i] = tmp;
 }
 T max() {
  return heap_[1];
 }
 int index(const T& t) {
  return index(1, t);
 }
 void removeByIndex(int i) {
  if (i < 1)
   return;
  if (heap_[size_] == heap_[i]) {
   heap_[i] = heap_[size_];
   size_--;
   return;
  }
  if (heap_[size_] < heap_[i]) {
   heap_[i] = heap_[size_];
   size_--;
   maxDown(i);
   return;
  }
  heap_[i] = heap_[size_];
  size_--;
  maxUp(i);
 }
 void remove(const T& t) {
  return removeByIndex(index(t));
 }
private:
 inline int index(int i, const T& t) {
  if (heap_[i] < t)
   return -1;
  if (heap_[i] == t)
   return i;
  int r = index(2 * i, t);
  if (r != -1)
   return r;
  return index(2 * i + 1, t);
 }
 inline void maxDown(int i) {
  if (i * 2 > size_ && (i * 2 + 1) > size_)
   return;
  int l = i * 2;
  int r = l + 1;
  int m = l;
  if (r <= size_ && heap_[r] > heap_[l])
   m = r;
  if (heap_[m] <= heap_[i])
   return;
  T tmp = heap_[i];
  heap_[i] = heap_[m];
  heap_[m] = tmp;
  maxDown(m);
 }
 inline void maxUp(int i) {
  if (i <= 1)
   return;
  int p = i / 2;
  if (heap_[p] >= heap_[i])
   return;
  T tmp = heap_[i];
  heap_[i] = heap_[p];
  heap_[p] = tmp;
  maxUp(p);
 }
private:
 T* heap_;
 int capacity_;
 int size_;
};

static MaxHeap<int>* all[101] = { 0, };
static int mt = 0;

void Init()
{
 for (int i = 1; i < mt; i++)
  if (all[i]) {
   delete all[i];
   all[i] = 0;
  }
 mt = 0;
}

void insertID(int ProductType, int ProductID)
{
 if (!all[ProductType])
  all[ProductType] = new MaxHeap <int>(50001) ;
 all[ProductType]->insert(ProductID);
 if ((ProductType + 1) > mt)
  mt = ProductType + 1;
}

int highestID(int ProductType)
{
 if (!all[ProductType] || all[ProductType]->size() <= 0)
  return -1;
 return all[ProductType]->max();
}

int findhighestID(int type)
{
 int maxType = -1;
 int maxId = -1;
 for (int i = 1; i < mt; i++)
  if (all[i] && all[i]->size() > 0) {
   int max = all[i]->max();
   if (max > maxId) {
    maxId = max;
    maxType = i;
   }
  }
 if (type == 0)
  return maxType;
 return maxId;
}

void demarket(int ProductID)
{
 for (int i = 1; i < mt; i++)
  if (all[i]) {
   int index = all[i]->index(ProductID);
   if (index >= 1) {
    all[i]->removeByIndex(index);
    break;
   }
  }
}

Ember.js : Custom "index" route's path and Custom "/" path's route

"index" Route

The index route, which will handle requests to the root URI (/) of our site.
How to generate a new route called index:
ember g route index
The index route is special: it does NOT require an entry in the router's mapping.

a Nested "index" Route

An index nested route works similarly to the base index route. It is the default route that renders when no route is provided. Use 'rentals' as example, when we navigate to /rentals, Ember will attempt to load the rentals index route as a nested route.
To create an index nested route, run the following command:
ember g route rentals/index
If you open up your Router (app/router.js) you may notice that the rentals line has changed. This extra function() {} is required because it needs a child route, the this.route('index', { path: '/'}); is implied.

Router.map(function() {
  this.route('about');
  this.route('contact');
  this.route('rentals', function() {
    // implied code
    // this.route('index', { path: '/'});
  });
});

replaceWith and transitionTo

Use "replaceWidth" and "transitionTo", We can simply forward "/" to the "rentals" route. You will found the url displayed in url bar will changed from "http://localhost" to "http://localhost/rentals".
Well, everything is fine here except one little fault.
I do not want this redirect from "/" to "/rentals".
I hope it always be "/".
Can we make it ?

Is "index/index" possible ?

I tried below command:

ember g route index/index
installing route
  create app/routes/index/index.js
  create app/templates/index/index.hbs
updating router
  add route index/index
installing route-test
  create tests/unit/routes/index/index-test.js

Command execute without errors, but blank page showed with "http://localhost".
It seems not work. Then I remember the impled code:
this.route('index', { path: '/'});

However, you can add the index route if you want to customize it. For example, you can modify the index route's path by specifying this.route('index', { path: '/custom-path'}).

Custom "index" route's path

We can custom "index" route's path by the impled code.
I guess We can custom the path's route also.
this.route('rentals', {path:'/'});
Ember server will handle requests to the root URI (/) to route "rentals" rather than the default "index" route now.
Can it works ? Let's try

Custom path's route

I use super-rentals as a example.
First I destroy "index" route.
ember d route index
Modify the app router.

git diff app/router.js
diff --git a/app/router.js b/app/router.js
index 254d53d..9f14d85 100644
--- a/app/router.js
+++ b/app/router.js
@@ -9,7 +9,7 @@ const Router = EmberRouter.extend({
 Router.map(function() {
   this.route('about');
   this.route('contact');
-  this.route('rentals', function() {
+  this.route('rentals', {path:'/'}, function() {
     this.route('show', { path: '/:rental_id' });
   });
 });

Modify templates, all link to "index" replaced with "rentals".

-  {{#link-to 'index' class="button"}}
+  {{#link-to 'rentals' class="button"}}

ember serve
I got what I wished.
The url bar is clean now.
Only "http://localhost", no "rentals" anymore.

Refers

Routes and templates
Adding Nested Routes

Set up gitweb server on nginx

Precondition

please setup your git server via git-http-backend on nginx.

Setup gitweb conf

sudo apt-get install gitweb 

/etc/gitweb.conf is Gitweb (Git web interface) configuration file
The default project root is /usr/lib/git.
Here, I changed to my own path.
our $projectroot = "/home/errong_leng/www/git";

Change nginx conf

cat /etc/nginx/sites-enabled/git.errong.win.conf

server {
    listen  80;
    listen [::]:80;
    server_name git.errong.win;
    auth_basic "Restricted";
    auth_basic_user_file /home/errong_leng/.gitpasswd;
 location ~ ^.*\.git/(HEAD|info/refs|objects/info/.*|git-(upload|receive)-pack)$ {
  root /home/errong_leng/www/git;
  fastcgi_pass unix:/var/run/fcgiwrap.socket;
  fastcgi_param SCRIPT_FILENAME   /usr/lib/git-core/git-http-backend;
  fastcgi_param PATH_INFO         $uri;
  fastcgi_param GIT_PROJECT_ROOT  /home/errong_leng/www/git;
  fastcgi_param GIT_HTTP_EXPORT_ALL "";
  fastcgi_param REMOTE_USER $remote_user;
  include fastcgi_params;
 }
 location /index.cgi {
  root /usr/share/gitweb;
  include fastcgi_params;
  gzip off;
  fastcgi_param SCRIPT_NAME $uri;
  fastcgi_param GITWEB_CONFIG /etc/gitweb.conf;
  fastcgi_pass unix:/var/run/fcgiwrap.socket;
 }
 location / {
  root /usr/share/gitweb;
  index index.cgi;
 }
}

cat /etc/nginx/sites-enabled/git.errong.win-ssl.conf

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name git.errong.win;
    ssl_certificate /etc/letsencrypt/git.errong.win/fullchain.cer;
    ssl_certificate_key /etc/letsencrypt/git.errong.win/git.errong.win.key;
    auth_basic "Restricted";
    auth_basic_user_file /home/errong_leng/.gitpasswd;
 location ~ ^.*\.git/(HEAD|info/refs|objects/info/.*|git-(upload|receive)-pack)$ {
  root /home/errong_leng/www/git;
  fastcgi_pass unix:/var/run/fcgiwrap.socket;
  fastcgi_param SCRIPT_FILENAME   /usr/lib/git-core/git-http-backend;
  fastcgi_param PATH_INFO         $uri;
  fastcgi_param GIT_PROJECT_ROOT  /home/errong_leng/www/git;
  fastcgi_param GIT_HTTP_EXPORT_ALL "";
  fastcgi_param REMOTE_USER $remote_user;
  include fastcgi_params;
 }
 location /index.cgi {
  root /usr/share/gitweb;
  include fastcgi_params;
  gzip off;
  fastcgi_param SCRIPT_NAME $uri;
  fastcgi_param GITWEB_CONFIG /etc/gitweb.conf;
  fastcgi_pass unix:/var/run/fcgiwrap.socket;
    }
 location / {
  root /usr/share/gitweb;
  index index.cgi;
 }
}

Restart nginx server.

gitweb done

errors handle

If your gitweb server can't work.
You can check the error log to analysis the cause.
cat /var/log/nginx/error.log
In my case, I encountered below errors.
It turned out that my system did not install perl module for CGI and HTML::Entities.
I installed them manually from sources.
Download CGI source
Download HTML::Entities source
I have a post for this. Install perl module from source

2018/06/13 04:35:36 [error] 28827#28827: *6986 FastCGI sent in stderr: "Can't locate CGI.pm in @INC (you may nee
d to install the CGI module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.22.1 /usr/local/sh
are/perl/5.22.1 /usr/lib/x86_64-linux-gnu/perl5/5.22 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.22 /usr/s
hare/perl/5.22 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base .) at /usr/share/gitweb/index.cgi li
ne 13.
BEGIN failed--compilation aborted at /usr/share/gitweb/index.cgi line 13" while reading response header from ups
tream, client: 58.213.161.114, server: git.errong.win, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var
/run/fcgiwrap.socket:", host: "git.errong.win"
2018/06/13 04:35:36 [error] 28827#28827: *6986 upstream prematurely closed FastCGI stdout while reading response
 header from upstream, client: 58.213.161.114, server: git.errong.win, request: "GET / HTTP/1.1", upstream: "fas
tcgi://unix:/var/run/fcgiwrap.socket:", host: "git.errong.win"


2018/06/13 04:58:03 [error] 28827#28827: *7008 FastCGI sent in stderr: "[Wed Jun 13 04:58:03 2018] index.cgi: Ca
n't locate HTML/Entities.pm in @INC (you may need to install the HTML::Entities module) (@INC contains: /etc/per
l /usr/local/lib/x86_64-linux-gnu/perl/5.22.1 /usr/local/share/perl/5.22.1 /usr/lib/x86_64-linux-gnu/perl5/5.22 
/usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.22 /usr/share/perl/5.22 /usr/local/lib/site_perl /usr/lib/x86_
64-linux-gnu/perl-base .) at /usr/local/share/perl/5.22.1/CGI.pm line 2219" while reading response header from u
pstream, client: 58.213.161.114, server: git.errong.win, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/v
ar/run/fcgiwrap.socket:", host: "git.errong.win"
2018/06/13 04:58:30 [error] 28827#28827: *7010 FastCGI sent in stderr: "[Wed Jun 13 04:58:30 2018] index.cgi: Ca
n't locate HTML/Entities.pm in @INC (you may need to install the HTML::Entities module) (@INC contains: /etc/per
l /usr/local/lib/x86_64-linux-gnu/perl/5.22.1 /usr/local/share/perl/5.22.1 /usr/lib/x86_64-linux-gnu/perl5/5.22 
/usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.22 /usr/share/perl/5.22 /usr/local/lib/site_perl /usr/lib/x86_
64-linux-gnu/perl-base .) at /usr/local/share/perl/5.22.1/CGI.pm line 2219" while reading response header from u
pstream, client: 210.94.41.89, server: git.errong.win, request: "GET / HTTP/2.0", upstream: "fastcgi://unix:/var
/run/fcgiwrap.socket:", host: "git.errong.win"

Install Perl module on ubuntu

Install by cpan

cpan -i foo
Replace foo with the module name you want to install.

Install from source

Search the module on cpan.org
Download the source.
Let's use HTML::Entities for example.
You will get your search url:
http://search.cpan.org/~gaas/HTML-Parser-3.72/lib/HTML/Entities.pm
The source url will be:
http://www.cpan.org/authors/id/G/GA/GAAS/HTML-Parser-3.72.tar.gz

Make and install perl module

  tar -xvf HTML-Parser-3.72.tar.gz   
  cd HTML-Parser-3.72/ 
  perl Makefile.PL
  make
  sudo make install