feat: allow disabling storage persistence

packages/core/src/configuration.ts

@@ -148,10 +148,17 @@ export interface ConfigurationOptions {
     /**
      * Sets the log level to the given value.
      *
-     * Alternative to `CRAWLEE_LOG_LEVEL`.
+     * Alternative to `CRAWLEE_LOG_LEVEL` environment variable.
      * @default 'INFO'
      */
     logLevel?: LogLevel | LogLevel[keyof LogLevel];
+
+    /**
+     * Defines whether the storage client used should persist the data it stores.
+     *
+     * Alternative to `CRAWLEE_PERSIST_STORAGE` environment variable.
+     */
+    persistStorage?: boolean;
 }
 
 /**
@@ -203,7 +210,9 @@ export interface ConfigurationOptions {
  * `defaultDatasetId` | `CRAWLEE_DEFAULT_DATASET_ID` | `'default'`
  * `defaultKeyValueStoreId` | `CRAWLEE_DEFAULT_KEY_VALUE_STORE_ID` | `'default'`
  * `defaultRequestQueueId` | `CRAWLEE_DEFAULT_REQUEST_QUEUE_ID` | `'default'`
- * `persistStateIntervalMillis` | `CRAWLEE_PERSIST_STATE_INTERVAL_MILLIS` | `60e3`
+ * `persistStateIntervalMillis` | `CRAWLEE_PERSIST_STATE_INTERVAL_MILLIS` | `60_000`
+ * `purgeOnStart` | `CRAWLEE_PURGE_ON_START` | `true`
+ * `persistStorage` | `CRAWLEE_PERSIST_STORAGE` | `true`
  *
  * ## Advanced Configuration Options
  *
@@ -213,6 +222,8 @@ export interface ConfigurationOptions {
  * `xvfb` | `CRAWLEE_XVFB` | -
  * `chromeExecutablePath` | `CRAWLEE_CHROME_EXECUTABLE_PATH` | -
  * `defaultBrowserPath` | `CRAWLEE_DEFAULT_BROWSER_PATH` | -
+ * `disableBrowserSandbox` | `CRAWLEE_DISABLE_BROWSER_SANDBOX` | -
+ * `availableMemoryRatio` | `CRAWLEE_AVAILABLE_MEMORY_RATIO` | `0.25`
  */
 export class Configuration {
     /**
@@ -233,9 +244,10 @@ export class Configuration {
         CRAWLEE_DEFAULT_BROWSER_PATH: 'defaultBrowserPath',
         CRAWLEE_DISABLE_BROWSER_SANDBOX: 'disableBrowserSandbox',
         CRAWLEE_LOG_LEVEL: 'logLevel',
+        CRAWLEE_PERSIST_STORAGE: 'persistStorage',
     };
 
-    protected static BOOLEAN_VARS = ['purgeOnStart', 'headless', 'xvfb', 'disableBrowserSandbox'];
+    protected static BOOLEAN_VARS = ['purgeOnStart', 'headless', 'xvfb', 'disableBrowserSandbox', 'persistStorage'];
 
     protected static INTEGER_VARS = ['memoryMbytes', 'persistStateIntervalMillis', 'systemInfoIntervalMillis'];
 
@@ -251,6 +263,7 @@ export class Configuration {
         headless: true,
         persistStateIntervalMillis: 60_000,
         systemInfoIntervalMillis: 60_000,
+        persistStorage: true,
     };
 
     /**
@@ -380,7 +393,11 @@ export class Configuration {
             return this.services.get(cacheKey) as MemoryStorage;
         }
 
-        const storage = new MemoryStorage(options);
+        const storage = new MemoryStorage({
+            persistStorage: this.get('persistStorage'),
+            // Override persistStorage if user provides it via storageClientOptions
+            ...options,
+        });
         this.services.set(cacheKey, storage);
 
         return storage;

packages/memory-storage/src/memory-storage.ts

@@ -26,6 +26,14 @@ export interface MemoryStorageOptions {
      * @default process.env.DEBUG?.includes('*') ?? process.env.DEBUG?.includes('crawlee:memory-storage') ?? false
      */
     writeMetadata?: boolean;
+
+    /**
+     * Whether the memory storage should also write its stored content to the disk.
+     *
+     * You can also disable this by setting the `CRAWLEE_PERSIST_STORAGE` environment variable to `false`.
+     * @default true
+     */
+    persistStorage?: boolean;
 }
 
 export class MemoryStorage implements storage.StorageClient {
@@ -34,6 +42,7 @@ export class MemoryStorage implements storage.StorageClient {
     readonly keyValueStoresDirectory: string;
     readonly requestQueuesDirectory: string;
     readonly writeMetadata: boolean;
+    readonly persistStorage: boolean;
 
     readonly keyValueStoresHandled: KeyValueStoreClient[] = [];
     readonly datasetClientsHandled: DatasetClient[] = [];
@@ -43,6 +52,7 @@ export class MemoryStorage implements storage.StorageClient {
         s.object({
             localDataDirectory: s.string.optional,
             writeMetadata: s.boolean.optional,
+            persistStorage: s.boolean.optional,
         }).parse(options);
 
         // v3.0.0 used `crawlee_storage` as the default, we changed this in v3.0.1 to just `storage`,
@@ -61,6 +71,8 @@ export class MemoryStorage implements storage.StorageClient {
         this.keyValueStoresDirectory = resolve(this.localDataDirectory, 'key_value_stores');
         this.requestQueuesDirectory = resolve(this.localDataDirectory, 'request_queues');
         this.writeMetadata = options.writeMetadata ?? process.env.DEBUG?.includes('*') ?? process.env.DEBUG?.includes('crawlee:memory-storage') ?? false;
+        this.persistStorage = options.persistStorage
+            ?? process.env.CRAWLEE_PERSIST_STORAGE ? !['false', '0', ''].includes(process.env.CRAWLEE_PERSIST_STORAGE!) : true;
 
         initWorkerIfNeeded();
     }

packages/memory-storage/src/resource-clients/dataset-collection.ts

@@ -57,6 +57,7 @@ export class DatasetCollectionClient implements storage.DatasetCollectionClient
             id: datasetInfo.name ?? datasetInfo.id,
             data: datasetInfo,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
 
         return datasetInfo;

packages/memory-storage/src/resource-clients/dataset.ts

@@ -188,6 +188,7 @@ export class DatasetClient<Data extends Dictionary = Dictionary> extends BaseCli
             entityDirectory: existingStoreById.datasetDirectory,
             id: existingStoreById.name ?? existingStoreById.id,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
     }
 
@@ -260,6 +261,7 @@ export class DatasetClient<Data extends Dictionary = Dictionary> extends BaseCli
             entityDirectory: this.datasetDirectory,
             id: this.name ?? this.id,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
     }
 }

packages/memory-storage/src/resource-clients/key-value-store-collection.ts

@@ -57,6 +57,7 @@ export class KeyValueStoreCollectionClient implements storage.KeyValueStoreColle
             id: kvStoreInfo.name ?? kvStoreInfo.id,
             data: kvStoreInfo,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
 
         return kvStoreInfo;

packages/memory-storage/src/resource-clients/key-value-store.ts

@@ -276,6 +276,7 @@ export class KeyValueStoreClient extends BaseClient {
             entityDirectory: existingStoreById.keyValueStoreDirectory,
             id: existingStoreById.name ?? existingStoreById.id,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
     }
 
@@ -304,6 +305,7 @@ export class KeyValueStoreClient extends BaseClient {
                 entityDirectory: existingStoreById.keyValueStoreDirectory,
                 id: existingStoreById.name ?? existingStoreById.id,
                 writeMetadata: this.client.writeMetadata,
+                persistStorage: this.client.persistStorage,
             });
         }
     }
@@ -334,6 +336,7 @@ export class KeyValueStoreClient extends BaseClient {
             entityDirectory: this.keyValueStoreDirectory,
             id: this.name ?? this.id,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
     }
 }

packages/memory-storage/src/resource-clients/request-queue-collection.ts

@@ -57,6 +57,7 @@ export class RequestQueueCollectionClient implements storage.RequestQueueCollect
             id: queueInfo.name ?? queueInfo.id,
             data: queueInfo,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
 
         return queueInfo;

packages/memory-storage/src/resource-clients/request-queue.ts

@@ -326,6 +326,7 @@ export class RequestQueueClient extends BaseClient implements storage.RequestQue
                 entityDirectory: existingQueueById.requestQueueDirectory,
                 id: existingQueueById.name ?? existingQueueById.id,
                 writeMetadata: existingQueueById.client.writeMetadata,
+                persistStorage: existingQueueById.client.persistStorage,
             });
         }
     }
@@ -361,6 +362,7 @@ export class RequestQueueClient extends BaseClient implements storage.RequestQue
             entityDirectory: this.requestQueueDirectory,
             id: this.name ?? this.id,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
     }
 
@@ -372,6 +374,7 @@ export class RequestQueueClient extends BaseClient implements storage.RequestQue
             entityDirectory: this.requestQueueDirectory,
             id: this.name ?? this.id,
             writeMetadata: this.client.writeMetadata,
+            persistStorage: this.client.persistStorage,
         });
     }
 

packages/memory-storage/src/utils.ts

@@ -90,6 +90,7 @@ interface MetadataUpdate<Type extends EntityType, DataType> {
     entityDirectory: string;
     data: DataType;
     writeMetadata: boolean;
+    persistStorage: boolean;
 }
 
 interface EntriesUpdate<Type extends EntityType, DataType> {
@@ -99,6 +100,7 @@ interface EntriesUpdate<Type extends EntityType, DataType> {
     entityDirectory: string;
     data: DataType;
     writeMetadata: boolean;
+    persistStorage: boolean;
 }
 
 interface EntryDelete<Type extends EntityType> {
@@ -107,6 +109,7 @@ interface EntryDelete<Type extends EntityType> {
     action: 'delete-entry';
     entityDirectory: string;
     writeMetadata: boolean;
+    persistStorage: boolean;
     data: {
         id: string;
     };

packages/memory-storage/src/workers/worker-utils.ts

@@ -33,15 +33,15 @@ export async function handleMessage(message: WorkerReceivedMessage & { messageId
 }
 
 async function updateMetadata(message: WorkerUpdateMetadataMessage) {
-    // Ensure the directory for the entity exists
-    const dir = message.entityDirectory;
-    await ensureDir(dir);
-
     // Skip writing the actual metadata file. This is done after ensuring the directory exists so we have the directory present
     if (!message.writeMetadata) {
         return;
     }
 
+    // Ensure the directory for the entity exists
+    const dir = message.entityDirectory;
+    await ensureDir(dir);
+
     // Write the metadata to the file
     const filePath = resolve(dir, '__metadata__.json');
     await writeFile(filePath, JSON.stringify(message.data, null, '\t'));
@@ -61,6 +61,11 @@ async function lockAndWrite(filePath: string, data: unknown, stringify = true, r
 }
 
 async function updateItems(message: WorkerUpdateEntriesMessage) {
+    // Skip writing files to the disk if the client has the option set to false
+    if (!message.persistStorage) {
+        return;
+    }
+
     // Ensure the directory for the entity exists
     const dir = message.entityDirectory;
     await ensureDir(dir);

packages/memory-storage/test/__shared__.ts

@@ -0,0 +1,11 @@
+import { access } from 'node:fs/promises';
+import { setTimeout } from 'node:timers/promises';
+
+export async function waitTillWrittenToDisk(path: string): Promise<void> {
+    try {
+        await access(path);
+    } catch {
+        await setTimeout(50);
+        return waitTillWrittenToDisk(path);
+    }
+}

packages/memory-storage/test/no-writing-to-disk.test.ts

@@ -0,0 +1,61 @@
+import { readdir, rm } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import { MemoryStorage } from '@crawlee/memory-storage';
+import { waitTillWrittenToDisk } from './__shared__';
+
+describe('writeFilesToDisk option', () => {
+    const tmpLocation = resolve(__dirname, './tmp/no-writing-to-disk');
+
+    afterAll(async () => {
+        await rm(tmpLocation, { force: true, recursive: true });
+    });
+
+    describe('when false and writeMetadata is also false', () => {
+        const localDataDirectory = resolve(tmpLocation, './no-metadata');
+        const storage = new MemoryStorage({
+            localDataDirectory,
+            writeFilesToDisk: false,
+        });
+
+        test('creating a key-value pair in a key-value store should not write data to the disk', async () => {
+            const keyValueStoreInfo = await storage.keyValueStores().getOrCreate();
+
+            const keyValueStore = storage.keyValueStore(keyValueStoreInfo.id);
+            await keyValueStore.setRecord({ key: 'foo', value: 'test' });
+            const storePath = resolve(storage.keyValueStoresDirectory, `${keyValueStoreInfo.id}`);
+
+            await waitTillWrittenToDisk(storePath);
+
+            const directoryFiles = await readdir(storePath);
+
+            expect(directoryFiles).toHaveLength(0);
+        });
+    });
+
+    describe('when false and writeMetadata is true', () => {
+        const localDataDirectory = resolve(tmpLocation, './with-metadata');
+        const storage = new MemoryStorage({
+            localDataDirectory,
+            writeFilesToDisk: false,
+            writeMetadata: true,
+        });
+
+        test('creating a key-value pair in a key-value store should not write data to the disk, but it should write the __metadata__ file', async () => {
+            const keyValueStoreInfo = await storage.keyValueStores().getOrCreate();
+
+            const keyValueStore = storage.keyValueStore(keyValueStoreInfo.id);
+            await keyValueStore.setRecord({ key: 'foo', value: 'test' });
+
+            const storePath = resolve(storage.keyValueStoresDirectory, `${keyValueStoreInfo.id}`);
+
+            await waitTillWrittenToDisk(storePath);
+
+            const directoryFiles = await readdir(storePath);
+
+            expect(directoryFiles).toHaveLength(1);
+            expect(directoryFiles).toEqual([
+                '__metadata__.json',
+            ]);
+        });
+    });
+});

packages/memory-storage/test/write-metadata.test.ts

@@ -1,16 +1,7 @@
 import { MemoryStorage } from '@crawlee/memory-storage';
-import { access, readdir, rm } from 'node:fs/promises';
+import { readdir, rm } from 'node:fs/promises';
 import { resolve } from 'node:path';
-import { setTimeout } from 'node:timers/promises';
-
-async function waitTillWrittenToDisk(path: string): Promise<void> {
-    try {
-        await access(path);
-    } catch {
-        await setTimeout(50);
-        return waitTillWrittenToDisk(path);
-    }
-}
+import { waitTillWrittenToDisk } from './__shared__';
 
 describe('writeMetadata option', () => {
     const tmpLocation = resolve(__dirname, './tmp/write-metadata-tests');