Store network stats

lightning-backend/src/index.ts

@@ -2,6 +2,7 @@ import config from './config';
 import logger from './logger';
 import DB from './database';
 import lightningApi from './api/lightning-api-factory';
+import statsUpdater from './tasks/stats-updater';
 
 logger.notice(`Mempool Server is running on port ${config.MEMPOOL.HTTP_PORT}`);
 
@@ -13,8 +14,7 @@ class LightningServer {
   async init() {
     await DB.checkDbConnection();
 
-    const networkInfo = await lightningApi.getNetworkInfo();
-    logger.info(JSON.stringify(networkInfo));
+    statsUpdater.startService();
 
     const networkGraph = await lightningApi.getNetworkGraph();
     logger.info('Network graph channels: ' + networkGraph.channels.length);

lightning-backend/src/tasks/stats-updater.ts

@@ -0,0 +1,62 @@
+
+import DB from '../database';
+import logger from '../logger';
+import lightningApi from '../api/lightning-api-factory';
+
+/*
+CREATE TABLE IF NOT EXISTS lightning_stats (
+		id int(11) NOT NULL AUTO_INCREMENT,
+		added datetime NOT NULL,
+    channel_count int(11) NOT NULL,
+    node_count int(11) NOT NULL,
+    total_capacity double unsigned NOT NULL,
+    average_channel_size double unsigned NOT NULL,
+    CONSTRAINT PRIMARY KEY (id)
+  ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+*/
+
+
+class LightningStatsUpdater {
+  constructor() {}
+
+  public async startService() {
+    logger.info('Starting Lightning Stats service');
+
+    const now = new Date();
+    const nextHourInterval = new Date(now.getFullYear(), now.getMonth(), now.getDate(), Math.floor(now.getHours() / 1) + 1, 0, 0, 0);
+    const difference = nextHourInterval.getTime() - now.getTime();
+
+    setTimeout(() => {
+      this.$logLightningStats();
+      setInterval(() => {
+        this.$logLightningStats();
+      }, 1000 * 60 * 60);
+    }, difference);
+  }
+
+  private async $logLightningStats() {
+    const networkInfo = await lightningApi.getNetworkInfo();
+
+    try {
+      const query = `INSERT INTO lightning_stats(
+          added,
+          channel_count,
+          node_count,
+          total_capacity,
+          average_channel_size
+        )
+        VALUES (NOW(), ?, ?, ?, ?)`;
+
+      await DB.query(query, [
+        networkInfo.channel_count,
+        networkInfo.node_count,
+        networkInfo.total_capacity,
+        networkInfo.average_channel_size
+      ]);
+    } catch (e) {
+      logger.err('$logLightningStats() error: ' + (e instanceof Error ? e.message : e));
+    }
+  }
+}
+
+export default new LightningStatsUpdater();