Implement our own price indexer with historical data

backend/src/utils/axios-query.ts

@@ -0,0 +1,59 @@
+import axios, { AxiosResponse } from 'axios';
+import { SocksProxyAgent } from 'socks-proxy-agent';
+import backendInfo from '../api/backend-info';
+import config from '../config';
+import logger from '../logger';
+import * as https from 'https';
+
+export async function query(path): Promise<object | undefined> {
+ type axiosOptions = {
+   headers: {
+     'User-Agent': string
+   };
+   timeout: number;
+   httpsAgent?: https.Agent;
+ };
+ const setDelay = (secs: number = 1): Promise<void> => new Promise(resolve => setTimeout(() => resolve(), secs * 1000));
+ const axiosOptions: axiosOptions = {
+   headers: {
+     'User-Agent': (config.MEMPOOL.USER_AGENT === 'mempool') ? `mempool/v${backendInfo.getBackendInfo().version}` : `${config.MEMPOOL.USER_AGENT}`
+   },
+   timeout: config.SOCKS5PROXY.ENABLED ? 30000 : 10000
+ };
+ let retry = 0;
+
+ while (retry < config.MEMPOOL.EXTERNAL_MAX_RETRY) {
+   try {
+     if (config.SOCKS5PROXY.ENABLED) {
+       const socksOptions: any = {
+         agentOptions: {
+           keepAlive: true,
+         },
+         hostname: config.SOCKS5PROXY.HOST,
+         port: config.SOCKS5PROXY.PORT
+       };
+
+       if (config.SOCKS5PROXY.USERNAME && config.SOCKS5PROXY.PASSWORD) {
+         socksOptions.username = config.SOCKS5PROXY.USERNAME;
+         socksOptions.password = config.SOCKS5PROXY.PASSWORD;
+       } else {
+         // Retry with different tor circuits https://stackoverflow.com/a/64960234
+         socksOptions.username = `circuit${retry}`;
+       }
+
+       axiosOptions.httpsAgent = new SocksProxyAgent(socksOptions);
+     }
+
+     const data: AxiosResponse = await axios.get(path, axiosOptions);
+     if (data.statusText === 'error' || !data.data) {
+       throw new Error(`Could not fetch data from ${path}, Error: ${data.status}`);
+     }
+     return data.data;
+   } catch (e) {
+     logger.err(`Could not connect to ${path}. Reason: ` + (e instanceof Error ? e.message : e));
+     retry++;
+   }
+   await setDelay(config.MEMPOOL.EXTERNAL_RETRY_INTERVAL);
+ }
+ return undefined;
+}