Merge Lightning backend into Mempool backend

backend/src/api/explorer/statistics.api.ts

@@ -0,0 +1,32 @@
+import logger from '../../logger';
+import DB from '../../database';
+
+class StatisticsApi {
+  public async $getStatistics(): Promise<any> {
+    try {
+      const query = `SELECT UNIX_TIMESTAMP(added) AS added, channel_count, node_count, total_capacity FROM lightning_stats ORDER BY id DESC`;
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getStatistics error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getLatestStatistics(): Promise<any> {
+    try {
+      const [rows]: any = await DB.query(`SELECT * FROM lightning_stats ORDER BY id DESC LIMIT 1`);
+      const [rows2]: any = await DB.query(`SELECT * FROM lightning_stats ORDER BY id DESC LIMIT 1 OFFSET 72`);
+      return {
+        latest: rows[0],
+        previous: rows2[0],
+      };
+    } catch (e) {
+      logger.err('$getLatestStatistics error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+}
+
+export default new StatisticsApi();