Atlas Search

.gitignore

composer.lock
vendor/
static/

Atlas.class.php

<?php

use com\mongodb\Collection;
use util\profiling\Timer;
use web\Application;
use web\frontend\{Frontend, AssetsFrom, Handlebars, Get, View, Param};

class Atlas extends Application {
  use Connection;

  /** @return [:web.Handler] */
  public function routes() {
    $db= self::connect($this->environment->variable('MONGO_URI'), $this->environment->variable('MONGO_DB') ?? 'search');
    $impl= new class($db->collection(self::$COLLECTION), self::$INDEX) {

      public function __construct(private Collection $collection, private string $index) { }

      #[Get]
      public function search(#[Param('q')] $query= '') {
        $view= View::named('search');
        if ('' === $query) return $view;

        // Ranking: 1) Direct hit on title, 2) Phrase in title, 3) Phrase in overview, 4) Fuzzy matching
        $search= [
          'should' => [
            ['text'   => ['query' => $query, 'path' => 'title', 'score' => ['boost' => ['value' => 5.0]]]],
            ['phrase' => ['query' => $query, 'path' => 'title', 'score' => ['boost' => ['value' => 2.0]]]],
            ['phrase' => ['query' => $query, 'path' => 'overview', 'score' => ['boost' => ['value' => 1.0]]]],
            ['text'   => [
              'query' => $query,
              'path'  => ['title', 'overview', 'genres'],
              'fuzzy' => ['maxEdits' => 1],
              'score' => ['boost' => ['value' => 0.5]],
            ]],
          ],
        ];

        $timer= (new Timer())->start();
        $results= $this->collection->aggregate([
          ['$search'    => ['index' => $this->index, 'compound' => $search]],
          ['$limit'     => 20],
          ['$addFields' => ['meta' => '$$SEARCH_META']],
        ]);
        $timer->stop();

        return $view->with([
          'meta'    => ['elapsed' => (int)($timer->elapsedTime() * 1000)] + ($results->first()['meta'] ?? []),
          'results' => $results->all(),
        ]);
      }
    };

    return [
      '/static' => new AssetsFrom($this->environment->webroot()),
      '/'       => new Frontend($impl, new Handlebars('.', [[
        'date'  => fn($node, $context, $options) => date($options[1] ?? 'Y-m-d', $options[0]),
      ]]))
    ];
  }
}

composer.json

{
  "require": {
    "xp-forge/handlebars-templates": "^3.1",
    "xp-forge/frontend": "^6.3",
    "xp-forge/mongodb": "^2.3",
    "php": ">=8.0.0"
  },
  "scripts": {
    "dev": "xp -supervise web -m develop Atlas",
    "serve": "xp -supervise web Atlas",
    "post-update-cmd": "xp bundle && cp icon.svg static/search.svg"
  }
}

Connection.class.php

<?php

use com\mongodb\{MongoConnection, Database};

trait Connection {
  private static $COLLECTION= 'movies', $INDEX= 'full';

  private static function connect(string $uri, string $database): Database {
    return (new MongoConnection($uri))->database($database);
  }
}

icon.svg

ImportMovies.class.php

<?php

use lang\Environment;
use peer\http\HttpConnection;
use text\json\StreamInput;
use util\cmd\Console;

class ImportMovies {
  use Connection;

  /** @param string[] $args */
  public static function main($args): int {
    $db= self::connect(Environment::variable('MONGO_URI'), Environment::variable('MONGO_DB', 'search'));
    $collection= $db->collection(self::$COLLECTION);
    $source= $args[0] ?? 'https://www.meilisearch.com/movies.json';

    Console::writeLine('Importing ', $source, ' -> ', $collection);
    $response= (new HttpConnection($source))->get();
    if (200 !== $response->statusCode()) {
      Console::writeLine('Unexpected ', $response);
      return 1;
    }

    // Stream response, upserting movies in collection while going
    $input= new StreamInput($response->in(), 'utf-8');
    $records= 0;
    try {
      foreach ($input->elements() as $element) {
        $element['_id']= $element['id'];
        unset($element['id']);
        $collection->upsert($element['_id'], $element);
        Console::writef("\e[2K\r=> [%07d] \e[34m%s\e[0m%s", $element['_id'], $element['title'], $records % 1000 ? '' : "\n");
        $records++;
      }
      Console::writeLine();
    } finally {
      $input->close();
    }

    Console::writeLine('Finished, ', $records, ' record(s) imported');
    return 0;
  }
}

package.json

{
  "dependencies": {
    "htmx.org": "^1.9"
  },
  "bundles": {
    "vendor": {"htmx.org": ["dist/htmx.min.js"], "fonts://display=swap": "Montserrat:wght@400"}
  }
}

search.handlebars

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="description" content="Movie search">
  <title>{{#if meta}}{{request.params.q}} - {{/if}}Search</title>
  <link href="/static/vendor.css" rel="stylesheet">
  <link href="/static/search.svg" rel="icon">
  <style type="text/css">
    *, *::before, *::after {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body, h1, h2, h3, h4, p, figure, blockquote, dl, dd {
      margin: 0;
    }

    body {
      font-family: 'Montserrat', sans-serif;
      background-color: #F6F8FC;
    }

    header {
      padding: 1rem;
      border-bottom: 1px solid #C8CCD8;
      box-shadow: 0 .5rem .5rem rgb(128 128 128 / .1);
      background-color: white;
    }

    form {
      display: flex;
      gap: .5rem;
      border: 2px solid #C8CCD8;
      border-radius: .35rem;
      padding: .5rem;
      width: fit-content;
      align-items: center;

      img {
        width: 1.25rem;
        height: 1.25rem;
      }

      input {
        font: inherit;
        border: 0;
        font-size: larger;
        outline: none;
        width: 100%;
      }

      &:focus-within {
        border: 2px solid #9FBCFC;
      }
    }

    main {
      padding: .5rem;
      margin-top: 1rem;
    }

    #metrics {
      color: #444444;
      margin-bottom: 1rem;

      .detail {
        font-weight: bold;
      }
    }

    #results {
      display: flex;
      flex-direction: column;
      gap: 1rem;

      article {
        background-color: white;
        border-radius: .5rem;
        padding: 1rem;
        display: flex;
        box-shadow: 0 .25rem .25rem rgb(192 192 192 / .1);

        img {
          width: 9rem;
          height: fit-content;
          min-height: 12rem;
          object-fit: cover;
          border-radius: .5rem;
          margin-right: 1rem;
        }

        h2 {
          margin: 0;
        }

        p.date {
          font-size: smaller;
          font-weight: bold;
        }

        ul {
          display: flex;
          flex-wrap: wrap;
          list-style: none;
          margin: .25rem 0 .5rem 0;
          padding: 0;
          gap: .5rem;
        }

        li {
          background-color: #D3E4FC;
          border-radius: .25rem;
          padding: .25rem .5rem;
        }

        p {
          color: #444444;
          line-height: 1.7;
        }
      }
    }
  </style>
</head>
<body {{#with request.values.token}}hx-headers='{"X-CSRF-Token": "{{.}}"}'{{/with}}>
  <header>
    <form action="/" method="GET">
      <img src="/static/search.svg" alt="Search icon" width="18" height="18">
      <input name="q" type="text" placeholder="Search..." size="50" value="{{request.params.q}}">
    </form>
  </header>

  <main>
    {{#with meta}}
      <p id="metrics">
        {{#with count}}<span class="detail">~{{lowerBound}}</span>{{else}}No{{/with}} results
        in <span class="detail">{{elapsed}}</span> ms
      </p>

      <div id="results">
        {{#each results}}
          <article>
            <img src="{{poster}}" alt="Movie poster of {{title}}">
            <section>
              <h2>{{title}}</h2>
              <p class="date">{{date release_date 'Y'}}</p>
              <ul>{{#each genres}}<li>{{.}}</li>{{/each}}</ul>
              <p>{{overview}}</p>
            </section>
          </article>
        {{/each}}
      </div>
    {{/with}}
  </main>

  <script src="/static/vendor.js"></script>
  <script type="module">
    const $input = document.forms[0].elements['q'];
    $input.focus();
    $input.setSelectionRange($input.value.length, $input.value.length);
  </script>
</body>
</html>

SearchIndex.class.php

<?php

use com\mongodb\MongoConnection;
use lang\Environment;
use util\cmd\Console;

class SearchIndex {
  use Connection;

  /** @param string[] $args */
  public static function main($args) {
    $db= self::connect(Environment::variable('MONGO_URI'), Environment::variable('MONGO_DB', 'search'));
    $collection= $db->collection(self::$COLLECTION);

    // Quoting https://www.mongodb.com/docs/manual/reference/command/createSearchIndexes/:
    // This command can only be run on a deployment hosted on MongoDB Atlas, and requires an
    // Atlas cluster tier of at least M10. In the free tier, go to https://cloud.mongodb.com/
    // and create the indexes using the frontend
    $result= $collection->run('createSearchIndexes', ['indexes' => [[
      'name'       => self::$INDEX,
      'definition' => ['mappings' => ['dynamic' => true]],
    ]]]);
    Console::writeLine('Created index => ', $result);
  }
}

Setup instructions after cloning:

# Install dependencies
$ composer up

# Point environment variable to Atlas URI
$ export MONGO_URI="mongodb+srv://user:[email protected]/?readPreference=nearest"
$ export MONGO_DB=search

# Import movies
$ xp ImportMovies

# Create search index (requires Atlas M10 tier, in free tier, you need to do this using the frontend!)
$ xp SearchIndex

Finally, run xp serve (or xp dev for development mode) and open http://localhost:8080/