[4.x] Add LogTenancyBootstrapper

src/Bootstrappers/LogTenancyBootstrapper.php

@@ -0,0 +1,176 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Bootstrappers;
+
+use Closure;
+use Illuminate\Contracts\Config\Repository as Config;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Log\LogManager;
+use Illuminate\Support\Arr;
+use InvalidArgumentException;
+use Stancl\Tenancy\Contracts\TenancyBootstrapper;
+use Stancl\Tenancy\Contracts\Tenant;
+
+/**
+ * This bootstrapper makes it possible to configure tenant-specific logging.
+ *
+ * By default, the storage path channels ('single' and 'daily' by default,
+ * but feel free to customize that using the $storagePathChannels property)
+ * are configured to use tenant storage directories.
+ * For this to work correctly, this bootstrapper must run *after* FilesystemTenancyBootstrapper.
+ * FilesystemTenancyBootstrapper alters how storage_path() works in the tenant context.
+ *
+ * The bootstrapper also supports custom channel overrides via the $channelOverrides property (see the property's docblock).
+ *
+ * @see Stancl\Tenancy\Bootstrappers\FilesystemTenancyBootstrapper
+ */
+class LogTenancyBootstrapper implements TenancyBootstrapper
+{
+    protected array $defaultConfig = [];
+
+    protected array $configuredChannels = [];
+
+    /**
+     * Log channels that use the storage_path() helper for storing the logs. Requires FilesystemTenancyBootstrapper to run before this bootstrapper.
+     * Or you can bypass this default behavior by using overrides, since they take precedence over the default behavior.
+     *
+     * All channels included here will be configured to use tenant-specific storage paths.
+     */
+    public static array $storagePathChannels = ['single', 'daily'];
+
+    /**
+     * Custom channel configuration overrides.
+     *
+     * All channels included here will be configured using the provided override.
+     *
+     * Examples:
+     * - Array mapping (the default approach): ['slack' => ['url' => 'webhookUrl']] maps $tenant->webhookUrl to slack.url (if $tenant->webhookUrl is not null, otherwise, the override is ignored)
+     * - Closure: ['slack' => fn (Tenant $tenant, array $channel) => array_merge($channel, ['url' => $tenant->slackUrl])] (the closure should return the whole channel's config)
+     *
+     * In both cases, the override should be an array.
+     */
+    public static array $channelOverrides = [];
+
+    public function __construct(
+        protected Config $config,
+        protected LogManager $logManager,
+    ) {}
+
+    public function bootstrap(Tenant $tenant): void
+    {
+        $this->defaultConfig = $this->config->get('logging.channels');
+        $this->configuredChannels = $this->getChannels();
+
+        try {
+            $this->configureChannels($this->configuredChannels, $tenant);
+            $this->forgetChannels($this->configuredChannels);
+        } catch (\Throwable $exception) {
+            // Revert to default config if anything goes wrong during channel configuration
+            $this->config->set('logging.channels', $this->defaultConfig);
+            $this->forgetChannels($this->configuredChannels);
+
+            throw $exception;
+        }
+    }
+
+    public function revert(): void
+    {
+        $this->config->set('logging.channels', $this->defaultConfig);
+
+        $this->forgetChannels($this->configuredChannels);
+    }
+
+    /**
+     * Channels to configure and forget so they can be re-resolved afterwards.
+     *
+     * Includes:
+     * - the default channel
+     * - all channels in the $storagePathChannels array
+     * - all channels that have custom overrides in the $channelOverrides property
+     */
+    protected function getChannels(): array
+    {
+        /**
+         * Include the default channel in the list of channels to configure/re-resolve.
+         *
+         * Including the default channel is harmless (if it's not overridden or not in $storagePathChannels,
+         * it'll just be forgotten and re-resolved on the next use), and for the case where 'stack' is the default,
+         * this is necessary since the 'stack' channel will be resolved and saved in the log manager,
+         * and its stale config could accidentally be used instead of the stack member channels.
+         *
+         * For example, when you use 'stack' with the 'slack' channel and you want to configure the webhook URL,
+         * both 'stack' and 'slack' must be re-resolved after updating the config for the channels to use the correct webhook URLs.
+         * If only one of the mentioned channels would be re-resolved, the other's (stale) webhook URL could be used for logging.
+         */
+        $defaultChannel = $this->config->get('logging.default');
+
+        return array_filter(
+            array_unique([
+                $defaultChannel,
+                ...static::$storagePathChannels,
+                ...array_keys(static::$channelOverrides),
+            ]),
+            fn (string $channel): bool => $this->config->has("logging.channels.{$channel}")
+        );
+    }
+
+    /**
+     * Configure channels for the tenant context.
+     *
+     * Only the channels that are in the $storagePathChannels array
+     * or have custom overrides in the $channelOverrides property
+     * will be configured.
+     */
+    protected function configureChannels(array $channels, Tenant $tenant): void
+    {
+        foreach ($channels as $channel) {
+            if (isset(static::$channelOverrides[$channel])) {
+                $this->overrideChannelConfig($channel, static::$channelOverrides[$channel], $tenant);
+            } elseif (in_array($channel, static::$storagePathChannels)) {
+                // Set storage path channels to use tenant-specific directory (default behavior)
+                // The tenant log will be located at e.g. "storage/tenant{$tenantKey}/logs/laravel.log" (assuming FilesystemTenancyBootstrapper is used before this bootstrapper)
+                $this->config->set("logging.channels.{$channel}.path", storage_path('logs/laravel.log'));
+            }
+        }
+    }
+
+    protected function overrideChannelConfig(string $channel, array|Closure $override, Tenant $tenant): void
+    {
+        if (is_array($override)) {
+            // Map tenant attributes to channel config keys.
+            // If the tenant attribute is null,
+            // the override is ignored and the channel config key's value remains unchanged.
+            foreach ($override as $configKey => $tenantAttributeName) {
+                /** @var Tenant&Model $tenant */
+                $tenantAttribute = Arr::get($tenant, $tenantAttributeName);
+
+                if ($tenantAttribute !== null) {
+                    $this->config->set("logging.channels.{$channel}.{$configKey}", $tenantAttribute);
+                }
+            }
+        } elseif ($override instanceof Closure) {
+            $channelConfigKey = "logging.channels.{$channel}";
+
+            $result = $override($tenant, $this->config->get($channelConfigKey));
+
+            if (! is_array($result)) {
+                throw new InvalidArgumentException("Channel override closure for '{$channel}' must return an array.");
+            }
+
+            $this->config->set($channelConfigKey, $result);
+        }
+    }
+
+    /**
+     * Forget all passed channels so they can be re-resolved
+     * with updated config on the next logging attempt.
+     */
+    protected function forgetChannels(array $channels): void
+    {
+        foreach ($channels as $channel) {
+            $this->logManager->forgetChannel($channel);
+        }
+    }
+}