typescript

1 files changed, 71 insertions, 0 deletions

diff --git a/lib/rates.ts b/lib/rates.ts
new file mode 100644
index 00000000..fe942453
--- /dev/null
+++ b/lib/rates.ts
@@ -0,0 +1,71 @@
+import got from "got";
+import config from "$config";
+import store from "$lib/store";
+import { err, warn } from "$lib/logging";
+import { g, s } from "$lib/db";
+import { sleep } from "$lib/utils";
+import WebSocket from "ws";
+
+let last;
+let ws;
+let connect = async () => {
+  if (ws && ws.readyState === 1 && Date.now() - last < 5000) return;
+  if (ws) ws.terminate() && (await sleep(Math.round(Math.random() * 1000)));
+
+  ws = new WebSocket("wss://stream.binance.com:9443/ws/btcusdt@ticker");
+
+  ws.onmessage = async function (event) {
+    try {
+      let msg = JSON.parse(event.data);
+      let rates = await g("rates");
+      let fx = await g("fx");
+      if (fx) ({ fx } = fx);
+
+      Object.keys(fx).map((symbol) => {
+        rates[symbol] = msg.c * fx[symbol];
+      });
+
+      s("rate", msg.c);
+      s("rates", rates);
+      last = Date.now();
+    } catch (e) {
+      console.log(e);
+      err("binance message error", e.message);
+    }
+  };
+
+  ws.onerror = async function (error) {
+    err("binance socket error", error.message);
+  };
+
+  return ws;
+};
+
+export let getFx = async () => {
+  connect();
+
+  let date = 0,
+    fx = await g("fx");
+  if (fx) ({ date, fx } = fx);
+
+  if (Date.now() - date > 24 * 60 * 60 * 1000) {
+    date = Date.now();
+    try {
+      let r = await got(
+        `http://data.fixer.io/api/latest?access_key=${config.fixer}`,
+      ).json();
+      let { rates: fx } = r;
+      let USD = fx["USD"];
+
+      Object.keys(fx).map((k) => {
+        fx[k] = fx[k] / USD;
+      });
+
+      await s("fx", { date, fx });
+    } catch (e) {
+      err("error fetching rates", e.message);
+    }
+  }
+
+  setTimeout(getFx, 30000);
+};