How to build Console Applications | SymfonyCon 2013

Source code: https://github.com/danielcsgomes/symfonycon-how-to-build-console-apps

In some cases you feel the need to have some specific command-line commands for deployment, testing some code or do any other specific task and you usually use shell script to do it.

Why not use Symfony2 Console component? You can easily build your own commands and interact with other bundles/components.

The Symfony2 Console component is a tool that gives you to build in a simple and easy way console applications.

This talk will focus on how you can simple build an Console applications and how you can interact with other bundles/components.

Transcript

1. How to build
   Console Applications
   Daniel Gomes
   @danielcsgomes
   December 13, 2013
   

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2. Who am I
   • Senior Software Engineer @ GuestCentric Systems
   • Co-founder & organizer @ phplx
   • Co-founder of a beautiful boy
   • ZCE PHP 5.3, CSM, OCP MySQL 5 Developer
   

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3. me on the web
   @danielcsgomes
   rate & feedback
   https://joind.in/10376
   

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4. is easy to create
   console applications?
   

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5. visualgrover © http://farm4.staticflickr.com/3081/2286086833_91f262868a_o_d.jpg
   are you nuts?
   

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6. !
   // /path/to/app.php
   require_once __DIR__ . '/vendor/autoload.php';
   !
   use Symfony\Component\Console\Application;
   !
   $app = new Application('My Console App', '0.0.1');
   $app->run();
   Daniel Gomes @danielcsgomes
   

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7. $ php app.php
   Daniel Gomes @danielcsgomes
   

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8. Thamara Maura © http://farm9.staticflickr.com/8491/8301588586_1ef18f3d9c_o_d.jpg
   

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9. What I needed
   •Run background jobs
   •Interactive setup tools
   •Cache clean up / warming
   •Basically to do a specific task
   Daniel Gomes @danielcsgomes
   

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10. What I got
    • Several script files
    • Written in Bash, PHP, Python, etc
    • No documentation
    • Not very friendly for other users
    Daniel Gomes @danielcsgomes
    

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11. I had an
    idea
    © Cayusa
    http://farm2.staticflickr.com/1288/981372736_74e2d99d8f_b_d.jpg
    Daniel Gomes @danielcsgomes
    

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12. Why not …
    • Centralize everything
    • Good documentation
    • Tests
    • User friendly
    Daniel Gomes @danielcsgomes
    

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13. Hello
    Symfony
    Console Component
    http://symfony.com/doc/current/components/console/introduction.html
    

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14. Zero Dependencies
    {
    "require": {
    "symfony/console": "~2.4"
    }
    }
    Install via composer
    

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15. What it brings
    •Application
    •Commands
    •Inputs
    •Outputs
    •Helpers
    •Events
    •Formatters
    

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16. Let’s start
    

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17. 1.
    Create
    the application
    

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18. !
    // /path/to/app.php
    require_once __DIR__ . '/vendor/autoload.php';
    !
    use Symfony\Component\Console\Application;
    !
    $app = new Application('My Console App', '0.0.1');
    $app->run();
    Daniel Gomes @danielcsgomes
    

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19. $ php app.php
    Daniel Gomes @danielcsgomes
    

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20. !
    How it works
    

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21. Standalone Console Component
    APPLICATION
    COMMAND A
    COMMAND B
    COMMAND C
    Plug-in & run
    Daniel Gomes @danielcsgomes
    

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22. with Symfony Framework
    !
    ├── app
    ├── bin
    ├── src
    └── Acme
    └── DemoBundle
    ├── Command
    │ ├── HelloWorldCommand.php
    │ └──
    ├── vendor
    └── web
    Autoload all commands inside the Bundles Command folder
    Daniel Gomes @danielcsgomes
    

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23. command <-> controller
    input <-> request
    output <-> response
    CLI <-> Web
    

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24. $app = new Application();
    $app->add(new MyCommand());
    $app->add(…);
    …
    $app->run();
    Daniel Gomes @danielcsgomes
    

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25. !
    2.
    Create
    the command
    

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26. class MyCommand extends Command
    {
    protected function configure(){…}
    !
    protected function execute($input, $output){…}
    !
    protected function interact($input, $output){…}
    }
    Daniel Gomes @danielcsgomes
    

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27. Workflow
    Command Configure
    Interact
    Execute
    is
    Interactive?
    yes
    no
    Daniel Gomes @danielcsgomes
    

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28. Configure
    the command
    

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29. namespace DCSG\Command;
    !
    use Symfony\Component\Console\Command\Command;
    !
    class HelloWorldCommand extends Command
    {
    protected function configure()
    {
    $this->setName('hello:world')
    ->setDescription('Hello World ');
    }
    }
    Daniel Gomes @danielcsgomes
    

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30. namespace DCSG\Command;
    !
    use Symfony\Component\Console\Command\Command;
    !
    class HelloWorldCommand extends Command
    {
    protected function configure()
    {
    $this->setName('hello:world')
    ->setDescription('Hello World ');
    }
    }
    Daniel Gomes @danielcsgomes
    namespace
    

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31. namespace DCSG\Command;
    !
    use Symfony\Component\Console\Command\Command;
    !
    class HelloWorldCommand extends Command
    {
    protected function configure()
    {
    $this->setName('hello:world')
    ->setDescription('Hello World ');
    }
    }
    Daniel Gomes @danielcsgomes
    namespace
    name
    

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32. $ php app.php
    Daniel Gomes @danielcsgomes
    

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33. Arguments
    and options
    

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34. Arguments
    • ordered
    • input type:
    • optional
    • required
    • array
    Daniel Gomes @danielcsgomes
    

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35. Options
    • unordered
    • input type:
    • optional
    • required
    • array
    • none (no input)
    Daniel Gomes @danielcsgomes
    

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36. protected function configure()
    {
    // ...
    $this->addArgument('name', InputArgument::REQUIRED);
    $this->addOption('uppercase', 'u');
    }
    Daniel Gomes @danielcsgomes
    

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37. !
    usage manual
    

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38. protected function configure()
    {
    // ...
    $this->setHelp(<<This is a simple command that outputs
    “Hello world 'Your Name’.”
    to the console.
    EOF
    );
    }
    Daniel Gomes @danielcsgomes
    

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39. $ php app.php hello:world —help
    Daniel Gomes @danielcsgomes
    

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40. $ php app.php hello:world —help
    Daniel Gomes @danielcsgomes
    

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41. $ php app.php hello:world —help
    Daniel Gomes @danielcsgomes
    

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42. $ php app.php hello:world —help
    Daniel Gomes @danielcsgomes
    

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43. $ php app.php hello:world —help
    Daniel Gomes @danielcsgomes
    

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44. Add logic
    

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45. class HelloWorldCommand extends Command
    {
    // ...
    !
    protected function execute(
    InputInterface $input,
    OutputInterface $output)
    {
    $name = $input->getArgument(‘name');
    !
    if ($input->getOption('uppercase')) {
    $name = strtoupper($name);
    }
    !
    $output->writeln("Hello World $name.");
    }
    }
    Daniel Gomes @danielcsgomes
    

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46. $ php app.php hello:world 'Daniel Gomes'
    Daniel Gomes @danielcsgomes
    

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47. Call a command
    from other command
    

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48. protected function execute($input, $output)
    {
    $command = $this->getApplication()->find('hello:world');
    !
    $arguments = array(
    'command' => 'hello:world',
    'name' => 'Daniel Gomes'
    );
    !
    $returnCode = $command->run(
    new ArrayInput($arguments),
    $output
    );
    $output->writeln("Exit code $returnCode");
    }
    }
    Daniel Gomes @danielcsgomes
    

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49. protected function execute($input, $output)
    {
    $command = $this->getApplication()->find('hello:world');
    !
    $arguments = array(
    'command' => 'hello:world',
    'name' => 'Daniel Gomes'
    );
    !
    $returnCode = $command->run(
    new ArrayInput($arguments),
    $output
    );
    $output->writeln("Exit code $returnCode");
    }
    }
    Daniel Gomes @danielcsgomes
    

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50. protected function execute($input, $output)
    {
    $command = $this->getApplication()->find('hello:world');
    !
    $arguments = array(
    'command' => 'hello:world',
    'name' => 'Daniel Gomes'
    );
    !
    $returnCode = $command->run(
    new ArrayInput($arguments),
    $output
    );
    $output->writeln("Exit code $returnCode");
    }
    }
    Daniel Gomes @danielcsgomes
    

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51. protected function execute($input, $output)
    {
    $command = $this->getApplication()->find('hello:world');
    !
    $arguments = array(
    'command' => 'hello:world',
    'name' => 'Daniel Gomes'
    );
    !
    $returnCode = $command->run(
    new ArrayInput($arguments),
    $output
    );
    $output->writeln("Exit code $returnCode");
    }
    }
    Daniel Gomes @danielcsgomes
    

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52. $ php app.php examples:calling:command
    Daniel Gomes @danielcsgomes
    

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53. Always validate
    the input
    

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54. protected function execute(
    InputInterface $input,
    OutputInterface $output)
    {
    $name = $input->getArgument(‘name');
    !
    if (preg_match("/[0-9]+/", $name)) {
    throw new \InvalidArgumentException('Invalid name.');
    }
    // …
    }
    Daniel Gomes @danielcsgomes
    

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55. $ php app.php hello:world 1
    Daniel Gomes @danielcsgomes
    

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56. User Interaction
    •Dialog Helper
    •Formatter Helper
    •Progress Helper
    •Table Helper
    Daniel Gomes @danielcsgomes
    

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57. Dialog Helper
    

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58. // Symfony/Component/Console/Helper/DialogHelper.php
    !
    public function select(...){...}
    !
    public function ask(...){...}
    !
    public function askConfirmation(...){...}
    !
    public function askHiddenResponse(...){...}
    !
    public function askAndValidate(...){...}
    !
    public function askHiddenResponseAndValidate (...){...}
    Daniel Gomes @danielcsgomes
    

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59. protected function execute($input, $output)
    {
    $colors = array('Red', 'Yellow', 'Green', 'Blue', 'Black');
    $dialog = $this->getHelperSet()->get('dialog');
    $index = $dialog->select(
    $output,
    'Please select your favorite color:',
    $colors
    );
    $output->writeln("Your favorite color is {$colors[$index]}");
    }
    Daniel Gomes @danielcsgomes
    

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60. $ php app.php examples:select
    Daniel Gomes @danielcsgomes
    

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61. $name = $this->getHelper('dialog')->askAndValidate(
    $output,
    'Insert your name: ',
    function ($name) {
    if (empty($name)) {
    throw new \InvalidArgumentException(
    'The name cannot be empty.’
    );
    }
    !
    return $name;
    }
    );
    $output->writeln("Your name is {$name}");
    Daniel Gomes @danielcsgomes
    

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62. $ php app.php examples:dialog
    Daniel Gomes @danielcsgomes
    

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63. Formatter Helper
    

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64. !
    $fmt = $this->getHelperSet()->get('formatter');
    !
    $formattedLine = $fmt->formatSection(
    ‘My Section',
    'Here is some message related to that section'
    );
    $output->writeln($formattedLine);
    !
    $msg = array('Something went wrong');
    $fmtBlock = $fmt->formatBlock($msg, 'error');
    $output->writeln($fmtBlock);
    !
    $msg = array('Custom Colors');
    $fmtBlock = $fmt->formatBlock($msg, ‘bg=blue;fg=white');
    $output->writeln($fmtBlock);
    Daniel Gomes @danielcsgomes
    

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65. !
    $fmt = $this->getHelperSet()->get('formatter');
    !
    $formattedLine = $fmt->formatSection(
    ‘My Section',
    'Here is some message related to that section'
    );
    $output->writeln($formattedLine);
    !
    $msg = array('Something went wrong');
    $fmtBlock = $fmt->formatBlock($msg, 'error');
    $output->writeln($fmtBlock);
    !
    $msg = array('Custom Colors');
    $fmtBlock = $fmt->formatBlock($msg, ‘bg=blue;fg=white');
    $output->writeln($fmtBlock);
    Daniel Gomes @danielcsgomes
    

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66. !
    $fmt = $this->getHelperSet()->get('formatter');
    !
    $formattedLine = $fmt->formatSection(
    ‘My Section',
    'Here is some message related to that section'
    );
    $output->writeln($formattedLine);
    !
    $msg = array('Something went wrong');
    $fmtBlock = $fmt->formatBlock($msg, 'error');
    $output->writeln($fmtBlock);
    !
    $msg = array('Custom Colors');
    $fmtBlock = $fmt->formatBlock($msg, ‘bg=blue;fg=white');
    $output->writeln($fmtBlock);
    Daniel Gomes @danielcsgomes
    

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67. !
    $fmt = $this->getHelperSet()->get('formatter');
    !
    $formattedLine = $fmt->formatSection(
    ‘My Section',
    'Here is some message related to that section'
    );
    $output->writeln($formattedLine);
    !
    $msg = array('Something went wrong');
    $fmtBlock = $fmt->formatBlock($msg, 'error');
    $output->writeln($fmtBlock);
    !
    $msg = array('Custom Colors');
    $fmtBlock = $fmt->formatBlock($msg, ‘bg=blue;fg=white');
    $output->writeln($fmtBlock);
    Daniel Gomes @danielcsgomes
    

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68. !
    $fmt = $this->getHelperSet()->get('formatter');
    !
    $formattedLine = $fmt->formatSection(
    ‘My Section',
    'Here is some message related to that section'
    );
    $output->writeln($formattedLine);
    !
    $msg = array('Something went wrong');
    $fmtBlock = $fmt->formatBlock($msg, 'error');
    $output->writeln($fmtBlock);
    !
    $msg = array('Custom Colors');
    $fmtBlock = $fmt->formatBlock($msg, ‘bg=blue;fg=white');
    $output->writeln($fmtBlock);
    Daniel Gomes @danielcsgomes
    

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69. $ php app.php examples:formatter
    Daniel Gomes @danielcsgomes
    

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70. Progress Helper
    

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71. $progress = $this->getHelperSet()->get('progress');
    !
    $progress->start($output, 50);
    $i = 0;
    while ($i++ < 50) {
    sleep(1);
    $progress->advance();
    }
    !
    $progress->finish();
    Daniel Gomes @danielcsgomes
    

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72. 1/10 [==>-------------------------] 10%
    !
    10/10 [============================] 100%
    $ php app.php examples:progress
    Daniel Gomes @danielcsgomes
    

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73. Table Helper
    

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74. $table = $this->getHelperSet()->get('table');
    $table
    ->setHeaders(array('Color', 'HEX'))
    ->setRows(
    array(
    array('Red', '#ff0000'),
    array('Blue', '#0000ff'),
    array('Green', '#008000'),
    array('Yellow', '#ffff00')
    )
    );
    $table->render($output);
    Daniel Gomes @danielcsgomes
    

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75. $ php app.php examples:table
    Daniel Gomes @danielcsgomes
    

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76. Use case
    Dump Databases
    

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77. protected function interact($input, $output)
    {
    $isEmpty = function($value) {
    if (empty($value)) {
    throw new \InvalidArgumentException('Value cannot be empty.');
    }
    return $value;
    };
    $dialog = $this->getHelper('dialog');
    $this->host = $dialog->askAndValidate($output, 'host: ', $isEmpty);
    $this->user = $dialog->askAndValidate($output, 'username: ', $isEmpty);
    $this->password = $dialog->askHiddenResponseAndValidate(
    $output, 'password: ', $isEmpty
    );
    $this->dbnames = $dialog->askAndValidate(
    $output, 'databases separate by space: ', $isEmpty
    );
    }
    Daniel Gomes @danielcsgomes
    

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78. protected function interact($input, $output)
    {
    $isEmpty = function($value) {
    if (empty($value)) {
    throw new \InvalidArgumentException('Value cannot be empty.');
    }
    return $value;
    };
    $dialog = $this->getHelper('dialog');
    $this->host = $dialog->askAndValidate($output, 'host: ', $isEmpty);
    $this->user = $dialog->askAndValidate($output, 'username: ', $isEmpty);
    $this->password = $dialog->askHiddenResponseAndValidate(
    $output, 'password: ', $isEmpty
    );
    $this->dbnames = $dialog->askAndValidate(
    $output, 'databases separate by space: ', $isEmpty
    );
    }
    Daniel Gomes @danielcsgomes
    

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79. protected function interact($input, $output)
    {
    $isEmpty = function($value) {
    if (empty($value)) {
    throw new \InvalidArgumentException('Value cannot be empty.');
    }
    return $value;
    };
    $dialog = $this->getHelper('dialog');
    $this->host = $dialog->askAndValidate($output, 'host: ', $isEmpty);
    $this->user = $dialog->askAndValidate($output, 'username: ', $isEmpty);
    $this->password = $dialog->askHiddenResponseAndValidate(
    $output, 'password: ', $isEmpty
    );
    $this->dbnames = $dialog->askAndValidate(
    $output, 'databases separate by space: ', $isEmpty
    );
    }
    Daniel Gomes @danielcsgomes
    

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80. protected function interact($input, $output)
    {
    $isEmpty = function($value) {
    if (empty($value)) {
    throw new \InvalidArgumentException('Value cannot be empty.');
    }
    return $value;
    };
    $dialog = $this->getHelper('dialog');
    $this->host = $dialog->askAndValidate($output, 'host: ', $isEmpty);
    $this->user = $dialog->askAndValidate($output, 'username: ', $isEmpty);
    $this->password = $dialog->askHiddenResponseAndValidate(
    $output, 'password: ', $isEmpty
    );
    $this->dbnames = $dialog->askAndValidate(
    $output, 'databases separate by space: ', $isEmpty
    );
    }
    Daniel Gomes @danielcsgomes
    

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81. Daniel Gomes @danielcsgomes
    protected function execute(… $input, … $output)
    {
    $mysqldump = $this->composeExecCommand($this->getOptions($input));
    !
    $process = new Process($mysqldump);
    $process->run();
    !
    // executes after the command finishes
    if (!$process->isSuccessful()) {
    throw new \RuntimeException($process->getErrorOutput());
    }
    !
    $output->writeln('Databases dumped with success.');
    }
    

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82. Daniel Gomes @danielcsgomes
    protected function execute(… $input, … $output)
    {
    $mysqldump = $this->composeExecCommand($this->getOptions($input));
    !
    $process = new Process($mysqldump);
    $process->run();
    !
    // executes after the command finishes
    if (!$process->isSuccessful()) {
    throw new \RuntimeException($process->getErrorOutput());
    }
    !
    $output->writeln('Databases dumped with success.');
    }
    

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83. Daniel Gomes @danielcsgomes
    protected function execute(… $input, … $output)
    {
    $mysqldump = $this->composeExecCommand($this->getOptions($input));
    !
    $process = new Process($mysqldump);
    $process->run();
    !
    // executes after the command finishes
    if (!$process->isSuccessful()) {
    throw new \RuntimeException($process->getErrorOutput());
    }
    !
    $output->writeln('Databases dumped with success.');
    }
    

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84. Daniel Gomes @danielcsgomes
    protected function execute(… $input, … $output)
    {
    $mysqldump = $this->composeExecCommand($this->getOptions($input));
    !
    $process = new Process($mysqldump);
    $process->run();
    !
    // executes after the command finishes
    if (!$process->isSuccessful()) {
    throw new \RuntimeException($process->getErrorOutput());
    }
    !
    $output->writeln('Databases dumped with success.');
    }
    

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85. $ php app.php database:dump
    Daniel Gomes @danielcsgomes
    

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86. Events
    •command - before run
    •exception - on exceptions
    •terminate - before return exit code
    •extend to add custom event
    note: requires Symfony EventDispatcher Component
    Daniel Gomes @danielcsgomes
    

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87. !
    3.
    Testing
    

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88. think in your
    command tests
    as functional tests
    

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89. CommandTester
    

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90. namespace Symfony\Component\Console\Tester;
    !
    class CommandTester
    {
    private $command;
    private $input;
    private $output;
    !
    public function __construct(Command $command){…}
    !
    public function execute(array $input, array $options=array()){…}
    !
    public function getDisplay($normalize = false){…}
    !
    public function getInput(){…}
    !
    public function getOutput(){…}
    }
    

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91. Test the name output
    

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92. public function testOutputNameInUppercase()
    {
    $command = new HelloWorldCommand();
    $commandTester = new CommandTester($command);
    $commandTester->execute(
    array(
    'command' => $command->getName(),
    'name' => 'Daniel',
    '--uppercase' => true,
    )
    );
    !
    $this->assertRegExp(
    '/DANIEL/',
    $commandTester->getDisplay()
    );
    }
    

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93. $ ./vendor/bin/phpunit
    Daniel Gomes @danielcsgomes
    

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94. 4.
    Dependency Injection
    in your CLI app
    

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95. Container
    

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96. Services
    CLI Application
    My Commands
    Container
    DBAL
    Finder
    setContainer(...)
    getContainer()
    Monolog
    …
    Daniel Gomes @danielcsgomes
    

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97. ContainerAwareInterface
    

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98. namespace Symfony\Component\DependencyInjection;
    !
    interface ContainerAwareInterface
    {
    /**
    * Sets the Container.
    *
    * @param ContainerInterface|null $container
    */
    public function setContainer(ContainerInterface $container = null);
    }
    

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99. use Symfony\Component\Console\Command\Command;
    use Symfony\Component\DependencyInjection\ContainerAwareInterface;
    use Symfony\Component\DependencyInjection\ContainerInterface;
    !
    class HelloWorldCommand
    extends Command
    implements ContainerAwareInterface
    {
    private $container;
    !
    public function setContainer(ContainerInterface $container = null)
    {
    $this->container = $container;
    }
    !
    protected function execute($input, $output)
    {
    $this->container->get(‘my_service');
    // ...
    }
    !
    // ...
    }
    

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100. ContainerAwareCommand
     

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101. abstract class ContainerAwareCommand
     extends Command implements ContainerAwareInterface
     {
     /** @var ContainerInterface|null */
     private $container;
     !
     /** @return ContainerInterface */
     protected function getContainer()
     {
     if (null === $this->container) {
     $this->container = $this->getApplication()
     ->getKernel()
     ->getContainer();
     }
     return $this->container;
     }
     !
     public function setContainer(ContainerInterface $container = null)
     {
     $this->container = $container;
     }
     }
     

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102. Example
     Logging
     with monolog
     

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103. protected function execute($input, $output)
     {
     $logger = $this->container->get('logger');
     $mysqldump = $this->composeExecCommand($this->getOptions($input));
     $exitCode = 0;
     $execOutput = array();
     exec($mysqldump, $execOutput, $exitCode);
     if (0 === $exitCode) {
     $message = "Success";
     $logger->addInfo('Databases dumped with success.’);
     } else {
     $message = "Error with exit code: {$exitCode}";
     $logger->addCritical('Error dumping databases.');
     touch($filename);
     }
     return $filename;
     }
     

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104. 5.
     Catching Signals
     

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105. Catching Signals
     • SIGSTOP & SIGKILL cannot be catch
     • Only SIGINT can be triggered by shortcut (ctrl+c)
     • Find the best Tick value that fits your needs
     • Define inside your Commands
     • Create a base command
     • Read “Signaling PHP” book by Cal Evans
     http://www.signalingphp.com
     Daniel Gomes @danielcsgomes
     

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106. protected function execute($input, $output)
     {
     declare(ticks = 10);
     pcntl_signal(SIGINT, [$this, 'signalHandler']);
     !
     do {
     // do something interesting here.
     $this->write('.');
     } while ($this->continueFlag);
     }
     !
     public function signalHandler($signal)
     {
     !
     echo "Caught a signal" . $signal . PHP_EOL;
     $this->continueFlag = false;
     }
     Daniel Gomes @danielcsgomes
     

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107. protected function execute($input, $output)
     {
     declare(ticks = 10);
     pcntl_signal(SIGINT, [$this, 'signalHandler']);
     !
     do {
     // do something interesting here.
     $this->write('.');
     } while ($this->continueFlag);
     }
     !
     public function signalHandler($signal)
     {
     !
     echo "Caught a signal" . $signal . PHP_EOL;
     $this->continueFlag = false;
     }
     Daniel Gomes @danielcsgomes
     

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108. $ ./bin/app examples:catch:signal
     Daniel Gomes @danielcsgomes
     

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109. Resources
     http://goo.gl/h0Xcfe
     http://symfony.com/doc/current/components/process.html
     Long running processes
     http://symfony.com/doc/current/components/console/index.html
     http://symfony.com/doc/current/cookbook/console/index.html
     http://symfony.com/doc/current/cookbook/service_container/index.html
     http://symfony.com/doc/current/components/dependency_injection/index.html
     Symfony2 Docs
     Cron jobs
     http://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/
     Source Code
     https://github.com/danielcsgomes/symfonycon-how-to-build-console-apps
     https://github.com/symfony/Console
     Catching Signals
     http://signalingphp.com
     https://github.com/Cilex/Cilex
     Cilex
     

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110. http://conference.phplx.net
     @phplxConf
     

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111. Questions?
     Daniel Gomes @danielcsgomes
     

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112. @danielcsgomes | me@danielcsgomes.com | http://danielcsgomes.com
     Photo by Jian Awe © http://www.flickr.com/photos/qqjawe/6511141237
     Please give feedback:
     https://joind.in/10376
     

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