caching test

example-request.sh

curl https://rpc.goo.tools -X POST -H "Content-Type: application/json" -d '
  {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getProgramAccounts",
    "params": [
      "cndyAnrLdpjq1Ssp1z8xxDsB8dxe7u4HL5Nxi2K5WXZ",
      {
        "dataSlice": { "offset": 0, "length": 0 }
      }
    ]
  }' | jq -r '.result[].pubkey'

worker.js

const url = "https://api.mainnet-beta.solana.com";

async function sha256(message) {
  const msgBuffer = new TextEncoder().encode(message);
  const hashBuffer = await crypto.subtle.digest("SHA-256", msgBuffer);
  const hashArray = Array.from(new Uint8Array(hashBuffer));
  const hashHex = hashArray
    .map((b) => ("00" + b.toString(16)).slice(-2))
    .join("");
  return hashHex;
}

async function handleRequest(event) {
  const body = await event.request.text();
  const hash = await sha256(body);

  let value = await RPC.get(hash);

  if (value === null) {
    const res = await fetch(url, {
      body,
      method: "POST",
      headers: {
        "content-type": "application/json",
      },
    });

    value = await res.text();

    await RPC.put(hash, value, { expirationTtl: 60 });
  }

  return new Response(value, {
    headers: {
      "content-type": "application/json",
    },
  });
}

addEventListener("fetch", (event) => {
  return event.respondWith(handleRequest(event));
});