canCreate database

src/Contracts/TenantDatabaseManager.php

@@ -21,4 +21,12 @@ interface TenantDatabaseManager
      * @return bool
      */
     public function deleteDatabase(string $name): bool;
+
+    /**
+     * Does a database exist.
+     *
+     * @param string $name
+     * @return boolean
+     */
+    public function databaseExists(string $name): bool;
 }

src/DatabaseManagerv2.php

@@ -8,6 +8,7 @@ use Illuminate\Foundation\Application;
 use Stancl\Tenancy\Jobs\QueuedTenantDatabaseCreator;
 use Illuminate\Database\DatabaseManager as BaseDatabaseManager;
 use Stancl\Tenancy\Exceptions\DatabaseManagerNotRegisteredException;
+use Stancl\Tenancy\Exceptions\TenantDatabaseAlreadyExistsException;
 
 class DatabaseManagerv2
 {
@@ -95,7 +96,11 @@ class DatabaseManagerv2
      */
     public function canCreate(Tenant $tenant)
     {
-        // todo
+        if ($this->getTenantDatabaseManager($tenant)->databaseExists($database = $tenant->getDatabaseName())) {
+            return new TenantDatabaseAlreadyExistsException($database);
+        }
+
+        return true;
     }
 
     public function createDatabase(Tenant $tenant)
@@ -129,7 +134,7 @@ class DatabaseManagerv2
 
         $databaseManagers = $this->app['config']['tenancy.database_managers'];
 
-        if (! \array_key_exists($driver, $databaseManagers)) {
+        if (! array_key_exists($driver, $databaseManagers)) {
             throw new DatabaseManagerNotRegisteredException($driver);
         }
 

src/Exceptions/TenantDatabaseAlreadyExistsException.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Stancl\Tenancy\Exceptions;
+
+use Stancl\Tenancy\Contracts\TenantCannotBeCreatedException;
+
+class TenantDatabaseAlreadyExistsException extends TenantCannotBeCreatedException
+{
+    /** @var string */
+    protected $database;
+
+    public function reason(): string
+    {
+        return "Database {$this->database} already exists.";
+    }
+
+    public function __construct(string $database)
+    {
+        parent::__construct();
+
+        $this->database = $database;
+    }
+}

src/TenantDatabaseManagers/MySQLDatabaseManager.php

@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace Stancl\Tenancy\TenantDatabaseManagers;
 
 use Illuminate\Support\Facades\DB;
-use Stancl\Tenancy\Interfaces\TenantDatabaseManager;
+use Stancl\Tenancy\Contracts\TenantDatabaseManager;
 
 class MySQLDatabaseManager implements TenantDatabaseManager
 {
@@ -18,4 +18,9 @@ class MySQLDatabaseManager implements TenantDatabaseManager
     {
         return DB::statement("DROP DATABASE `$name`");
     }
+
+    public function databaseExists(string $name): bool
+    {
+        return (bool) DB::select("SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '$name'");
+    }
 }

src/TenantDatabaseManagers/PostgreSQLDatabaseManager.php

@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace Stancl\Tenancy\TenantDatabaseManagers;
 
 use Illuminate\Support\Facades\DB;
-use Stancl\Tenancy\Interfaces\TenantDatabaseManager;
+use Stancl\Tenancy\Contracts\TenantDatabaseManager;
 
 class PostgreSQLDatabaseManager implements TenantDatabaseManager
 {
@@ -18,4 +18,9 @@ class PostgreSQLDatabaseManager implements TenantDatabaseManager
     {
         return DB::statement("DROP DATABASE \"$name\"");
     }
+
+    public function databaseExists(string $name): bool
+    {
+        return (bool) DB::select("SELECT datname FROM pg_database WHERE datname = '$name'");
+    }
 }

src/TenantDatabaseManagers/SQLiteDatabaseManager.php

@@ -4,14 +4,14 @@ declare(strict_types=1);
 
 namespace Stancl\Tenancy\TenantDatabaseManagers;
 
-use Stancl\Tenancy\Interfaces\TenantDatabaseManager;
+use Stancl\Tenancy\Contracts\TenantDatabaseManager;
 
 class SQLiteDatabaseManager implements TenantDatabaseManager
 {
     public function createDatabase(string $name): bool
     {
         try {
-            return \fclose(\fopen(database_path($name), 'w'));
+            return fclose(fopen(database_path($name), 'w'));
         } catch (\Throwable $th) {
             return false;
         }
@@ -20,9 +20,14 @@ class SQLiteDatabaseManager implements TenantDatabaseManager
     public function deleteDatabase(string $name): bool
     {
         try {
-            return \unlink(database_path($name));
+            return unlink(database_path($name));
         } catch (\Throwable $th) {
             return false;
         }
     }
+
+    public function databaseExists(string $name): bool
+    {
+        return file_exists(database_path($name));
+    }
 }

tests/TenantDatabaseManagerTest.php

@@ -12,6 +12,8 @@ use Stancl\Tenancy\Jobs\QueuedTenantDatabaseDeleter;
 
 class TenantDatabaseManagerTest extends TestCase
 {
+    // todo use data providers and TenantDatabaseManager::databaseExists()
+
     /** @test */
     public function sqlite_database_can_be_created_and_deleted()
     {