main.ts

import { Status } from "https://deno.land/std@0.193.0/http/http_status.ts";
import axiod from "https://deno.land/x/axiod@0.26.2/mod.ts";
import { cron } from "https://deno.land/x/deno_cron@v1.0.0/cron.ts";
import {
  Application,
  Context,
  helpers,
  Router,
} from "https://deno.land/x/oak@v12.6.0/mod.ts";

export const app = new Application();
export const router = new Router();
export const db = new Map();

type Entries<T> = {
  [K in keyof T]: [K, T[K]];
}[keyof T][];

type IndodaxResponse = {
  [key: string]: {
    last: number;
  };
};

cron("* * * * *", async () => {
  const response = await axiod.get("https://indodax.com/api/ticker_all");
  const tickers: Entries<IndodaxResponse> = Object.entries(
    response.data.tickers
  );
  for (const [symbol, { last: value }] of tickers) {
    const [key, pair] = symbol.split("_");
    if (pair === "idr") {
      db.set(key, value);
    }
  }
});
db.set("test", "OK");

router.get("/", (ctx: Context) => {
  const samples = ["btc", "eth", "usdt", "test"];
  ctx.response.status = Status.OK;
  ctx.response.type = "json";
  ctx.response.body = {
    message: "For each coin price you can check like on url below",
    erro: null,
    data: samples.map((sample) => `${ctx.request.url}${sample}`),
  };
});

router.get("/:coin", (ctx: Context) => {
  const { coin } = helpers.getQuery(ctx, { mergeParams: true });
  const result = db.get(coin);
  if (!result) {
    ctx.response.status = Status.NotFound;
    ctx.response.type = "json";
    ctx.response.body = {
      message: "Coin not found",
      error: "Not Found",
      data: null,
    };
    return;
  }

  ctx.response.status = Status.OK;
  ctx.response.type = "json";
  ctx.response.body = {
    symbol: coin,
    price: result,
  };
});

app.use(router.routes());
app.use(router.allowedMethods());

await app.listen({ port: 8000 });