feat: init seeding worker

 - manage it with env-var based filters
 - add webtorrent dependency
 - implement method seed to SeedingWorker class

docs/envs.md

@@ -26,6 +26,7 @@ This document describes the environment variables that can be used to configure
 | WRITE_TRANSACTION_DB_SIGNATURES          | Boolean              | true                                          | If true, the transactions signatures will be written to the database.                                                           |
 | ENABLE_DATA_DB_WAL_CLEANUP               | Boolean              | false                                         | If true, the data database WAL cleanup worker will be enabled                                                                   |
 | MAX_DATA_ITEM_QUEUE_SIZE                 | Number               | 100000                                        | Sets the maximum number of data items to queue for indexing before skipping indexing new data items                             |
+| SEEDING_WORKER_FILTER                    | String               | undefined                                     | The filter used to control what is seeded via the seeding worker (example via torrent protocol)                                 |
 | ARNS_ROOT_HOST                           | String               | undefined                                     | Domain name for ArNS host                                                                                                       |
 | SANDBOX_PROTOCOL                         | String               | undefined                                     | Protocol setting in process of creating sandbox domain in ArNS (ARNS_ROOT_HOST needs to be set for this env to have any effect) |
 | START_WRITERS                            | Boolean              | true                                          | If true, start indexing blocks, tx, ANS104 bundles                                                                              |

package.json

@@ -48,6 +48,7 @@
     "swagger-ui-express": "^4.5.0",
     "umzug": "^3.2.1",
     "wait": "^0.4.2",
+    "webtorrent": "^2.5.1",
     "winston": "^3.7.2",
     "yaml": "^2.3.4",
     "yesql": "^7.0.0"
@@ -70,6 +71,7 @@
     "@types/stream-json": "^1.7.2",
     "@types/supertest": "^2.0.16",
     "@types/swagger-ui-express": "^4.1.3",
+    "@types/webtorrent": "^0.109.8",
     "@typescript-eslint/eslint-plugin": "^5.26.0",
     "@typescript-eslint/parser": "^5.26.0",
     "c8": "^8.0.1",

src/config.ts

@@ -89,6 +89,16 @@ export const ON_DEMAND_RETRIEVAL_ORDER = env
   )
   .split(',');
 
+// seeding-worker (torrent) filter
+export const SEEDING_WORKER_FILTER_STRING = env.varOrUndefined(
+  'SEEDING_WORKER_FILTER',
+);
+
+export const SEEDING_WORKER_FILTER =
+  SEEDING_WORKER_FILTER_STRING === undefined
+    ? undefined
+    : createFilter(JSON.parse(SEEDING_WORKER_FILTER_STRING));
+
 //
 // Indexing
 //

src/system.ts

@@ -80,6 +80,7 @@ import { S3DataSource } from './data/s3-data-source.js';
 import { connect } from '@permaweb/aoconnect';
 import { DataContentAttributeImporter } from './workers/data-content-attribute-importer.js';
 import { SignatureFetcher } from './data/signature-fetcher.js';
+import { SeedingWorker } from './workers/seeding-worker.js';
 import { SQLiteWalCleanupWorker } from './workers/sqlite-wal-cleanup-worker.js';
 import { KvArnsStore } from './store/kv-arns-store.js';
 import { parquetExporter } from './routes/ar-io.js';
@@ -240,6 +241,16 @@ eventEmitter.on(events.TX_INDEXED, async (tx: MatchableItem) => {
     eventEmitter.emit(events.ANS104_TX_INDEXED, tx);
     eventEmitter.emit(events.ANS104_BUNDLE_INDEXED, tx);
   }
+
+  const seedingWorkerFilter = config.SEEDING_WORKER_FILTER;
+
+  if (
+    seedingWorkerFilter !== undefined &&
+    tx.id !== undefined &&
+    (await seedingWorkerFilter.match(tx))
+  ) {
+    seedingWorker.seed(tx.id);
+  }
 });
 
 eventEmitter.on(
@@ -616,6 +627,8 @@ if (dataSqliteWalCleanupWorker !== undefined) {
   dataSqliteWalCleanupWorker.start();
 }
 
+export const seedingWorker = new SeedingWorker({ log, contiguousDataSource });
+
 let isShuttingDown = false;
 
 export const shutdown = async (express: Server) => {

src/workers/seeding-worker.ts

@@ -0,0 +1,61 @@
+/**
+ * AR.IO Gateway
+ * Copyright (C) 2022-2023 Permanent Data Solutions, Inc. All Rights Reserved.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import { Logger } from 'winston';
+import WebTorrent from 'webtorrent';
+import { ContiguousDataSource } from '../types.js';
+
+export class SeedingWorker {
+  private log: Logger;
+  private contiguousDataSource: ContiguousDataSource;
+
+  public webTorrentClient: WebTorrent.Instance;
+
+  constructor({
+    log,
+    contiguousDataSource,
+  }: {
+    log: Logger;
+    contiguousDataSource: ContiguousDataSource;
+  }) {
+    this.webTorrentClient = new WebTorrent();
+    this.contiguousDataSource = contiguousDataSource;
+    this.log = log.child({ class: 'SeedingWorker' });
+  }
+
+  async seed(txId: string) {
+    this.log.debug(`Seeding ${txId}`);
+    const data = await this.contiguousDataSource.getData({ id: txId });
+    new Promise<void>((resolve) =>
+      this.webTorrentClient.seed(
+        data.stream,
+        {
+          announce: [
+            'wss://tracker.btorrent.xyz',
+            'wss://tracker.openwebtorrent.com',
+            'wss://tracker.webtorrent.io',
+          ],
+        },
+        (torrent: WebTorrent.Torrent) => {
+          this.log.debug(`Seeding ${txId} started: ${torrent.magnetURI}`);
+          resolve();
+        },
+      ),
+    );
+  }
+}