Refactor app container to modularity.

lib/packages/Inpsyde/Modularity/Container/PackageProxyContainer.php

@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Container;
+
+use WooCommerce\PayPalCommerce\Vendor\Inpsyde\Modularity\Package;
+use WooCommerce\PayPalCommerce\Vendor\Psr\Container\ContainerExceptionInterface;
+use WooCommerce\PayPalCommerce\Vendor\Psr\Container\ContainerInterface;
+
+class PackageProxyContainer implements ContainerInterface
+{
+    /**
+     * @var Package
+     */
+    private $package;
+
+    /**
+     * @var ContainerInterface|null
+     */
+    private $container;
+
+    /**
+     * @param Package $package
+     */
+    public function __construct(Package $package)
+    {
+        $this->package = $package;
+    }
+
+    /**
+     * @param string $id
+     * @return mixed
+     *
+     * @throws \Exception
+     */
+    public function get(string $id)
+    {
+        $this->assertPackageBooted($id);
+
+        return $this->container->get($id);
+    }
+
+    /**
+     * @param string $id
+     * @return bool
+     *
+     * @throws \Exception
+     */
+    public function has(string $id): bool
+    {
+        return $this->tryContainer() && $this->container->has($id);
+    }
+
+    /**
+     * @return bool
+     *
+     * @throws \Exception
+     * @psalm-assert-if-true ContainerInterface $this->container
+     */
+    private function tryContainer(): bool
+    {
+        if ($this->container) {
+            return true;
+        }
+
+        /** TODO: We need a better way to deal with status checking besides equality */
+        if (
+            $this->package->statusIs(Package::STATUS_READY)
+            || $this->package->statusIs(Package::STATUS_BOOTED)
+        ) {
+            $this->container = $this->package->container();
+        }
+
+        return (bool)$this->container;
+    }
+
+    /**
+     * @param string $id
+     * @return void
+     *
+     * @throws \Exception
+     *
+     * @psalm-assert ContainerInterface $this->container
+     */
+    private function assertPackageBooted(string $id): void
+    {
+        if ($this->tryContainer()) {
+            return;
+        }
+
+        $name = $this->package->name();
+        $status = $this->package->statusIs(Package::STATUS_FAILED)
+            ? 'is errored'
+            : 'is not ready yet';
+
+        throw new class ("Error retrieving service {$id} because package {$name} {$status}.")
+            extends \Exception
+            implements ContainerExceptionInterface {
+        };
+    }
+}