ping-thing-client.mjs

// Sample use:
// node ping-thing-client.mjs >> ping-thing.log 2>&1 &

import dotenv from "dotenv";
import web3 from "@solana/web3.js";
import bs58 from "bs58";
import axios from "axios";
import { watchBlockhash } from "./utils/blockhash.mjs";
import { watchSlotSent } from "./utils/slot.mjs";
import { sleep } from "./utils/misc.mjs";

import { setGlobalDispatcher, Agent } from "undici";

setGlobalDispatcher(
  new Agent({
    connections: 50,
  })
);

// Catch interrupts & exit
process.on("SIGINT", function () {
  console.log(`${new Date().toISOString()} Caught interrupt signal`, "\n");
  process.exit();
});

// Look for a command line flag --skip-validators-app to skip sending to validators.app
// I use this for debugging on localhost
const skipValidatorsApp = process.argv.includes("--skip-validators-app");

// Read constants from .env
dotenv.config();
const RPC_ENDPOINT = process.env.RPC_ENDPOINT;
const WS_ENDPOINT = process.env.WS_ENDPOINT;
const USER_KEYPAIR = web3.Keypair.fromSecretKey(
  bs58.decode(process.env.WALLET_PRIVATE_KEYPAIR)
);

console.log(`RPC_ENDPOINT: ${RPC_ENDPOINT}`);
console.log(`WS_ENDPOINT: ${WS_ENDPOINT}`);
console.log('');

const SLEEP_MS_RPC = process.env.SLEEP_MS_RPC || 2000;
const SLEEP_MS_LOOP = process.env.SLEEP_MS_LOOP || 0;
const VA_API_KEY = process.env.VA_API_KEY;
// process.env.VERBOSE_LOG returns a string. e.g. 'true'
const VERBOSE_LOG = process.env.VERBOSE_LOG === "true" ? true : false;
const COMMITMENT_LEVEL = process.env.COMMITMENT || "confirmed";
const USE_PRIORITY_FEE = process.env.USE_PRIORITY_FEE == "true" ? true : false;

const TX_RETRY_INTERVAL = 2000;

if (VERBOSE_LOG) console.log(`${new Date().toISOString()} Starting script`);

// Set up web3 client
// const walletAccount = new web3.PublicKey(USER_KEYPAIR.publicKey);
const connection = new web3.Connection(RPC_ENDPOINT, {
  commitment: COMMITMENT_LEVEL,
});

const connectionWs = new web3.Connection(RPC_ENDPOINT, {
  wsEndpoint: WS_ENDPOINT,
});

const gBlockhash = { value: null, updated_at: 0 };

// Record new slot on `firstShredReceived`
const gSlotSent = { value: null, updated_at: 0 };

async function pingThing() {

  // Pre-define loop constants & variables
  const FAKE_SIGNATURE =
    "9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999";

  // Run inside a loop that will exit after 3 consecutive failures
  const MAX_TRIES = 3;
  let tryCount = 0;

  // Loop until interrupted
  for (let i = 0; ; ++i) {
    // Sleep before the next loop
    if (i > 0) {
      await sleep(SLEEP_MS_LOOP);
    }

    let blockhash;
    let slotSent;
    let slotLanded;
    let signature;
    let txStart;
    let txSendAttempts = 1;

    // Wait fresh data
    while (true) {
      if (
        Date.now() - gBlockhash.updated_at < 10000 &&
        Date.now() - gSlotSent.updated_at < 50
      ) {
        blockhash = gBlockhash.value;
        slotSent = gSlotSent.value;
        break;
      }

      await sleep(1);
    }

    try {
      try {
        // Setup our transaction
        const tx = new web3.Transaction();
        if (USE_PRIORITY_FEE) {
          tx.add(
            web3.ComputeBudgetProgram.setComputeUnitLimit({
              units: process.env.CU_BUDGET || 5000,
            }),
            web3.ComputeBudgetProgram.setComputeUnitPrice({
              microLamports: process.env.PRIORITY_FEE_MICRO_LAMPORTS || 3,
            })
          );
        }
        tx.add(
          web3.SystemProgram.transfer({
            fromPubkey: USER_KEYPAIR.publicKey,
            toPubkey: USER_KEYPAIR.publicKey,
            lamports: 5000,
          })
        );

        // Sign
        tx.lastValidBlockHeight = blockhash.lastValidBlockHeight;
        tx.recentBlockhash = blockhash.blockhash;
        tx.sign(USER_KEYPAIR);

        const signatureRaw = tx.signatures[0].signature;
        signature = bs58.encode(signatureRaw);

        if (VERBOSE_LOG)
          console.log(`${new Date().toISOString()} sending: ${signature}`);

        // Send and wait confirmation (subscribe on confirmation before sending)
        const resultPromise = connectionWs.confirmTransaction(
          {
            signature,
            blockhash: tx.recentBlockhash,
            lastValidBlockHeight: tx.lastValidBlockHeight,
          },
          COMMITMENT_LEVEL
        );

        txStart = Date.now();
        const sendTxResult = await connection.sendRawTransaction(
          tx.serialize(),
          {
            skipPreflight: true,
            maxRetries: 0,
          }
        );

        if (sendTxResult !== signature) {
          throw new Error(
            `Receive invalid signature from sendRawTransaction: ${sendTxResult}, expected ${signature}`
          );
        }

        let confirmedTransaction = null;

        while (!confirmedTransaction) {
          const resultPromise = connectionWs.confirmTransaction(
            {
              signature,
              blockhash: tx.recentBlockhash,
              lastValidBlockHeight: tx.lastValidBlockHeight,
            },
            COMMITMENT_LEVEL
          );

          confirmedTransaction = await Promise.race([
            resultPromise,
            new Promise((resolve) =>
              setTimeout(() => {
                resolve(null);
              }, TX_RETRY_INTERVAL)
            ),
          ]);
          if (confirmedTransaction) {
            break;
          }

          console.log(
            `${new Date().toISOString()} Tx not confirmed after ${TX_RETRY_INTERVAL * txSendAttempts++}ms, resending`
          );

          await connection.sendRawTransaction(tx.serialize(), {
            skipPreflight: true,
            maxRetries: 0,
          });
        }

        if (confirmedTransaction.value.err) {
          throw new Error(
            `Transaction ${signature} failed (${JSON.stringify(confirmedTransaction.value)})`
          );
        }
      } catch (e) {
        // Log and loop if we get a bad blockhash.
        if (e.message.includes("Blockhash not found")) {
          console.log(`${new Date().toISOString()} ERROR: Blockhash not found`);
          continue;
        }

        // If the transaction expired on the chain. Make a log entry and send
        // to VA. Otherwise log and loop.
        if (e.name === "TransactionExpiredBlockheightExceededError") {
          console.log(
            `${new Date().toISOString()} ERROR: Blockhash expired/block height exceeded. TX failure sent to VA.`
          );
        } else {
          console.log(`${new Date().toISOString()} ERROR: ${e.name}`);
          console.log(e.message);
          console.log(e);
          console.log(JSON.stringify(e));
          continue;
        }

        // Need to submit a fake signature to pass the import filters
        signature = FAKE_SIGNATURE;
      }

      const txEnd = Date.now();
      // Sleep a little here to ensure the signature is on an RPC node.
      await sleep(SLEEP_MS_RPC);
      if (signature !== FAKE_SIGNATURE) {
        // Capture the slotLanded
        let txLanded = await connection.getTransaction(signature, {
          commitment: COMMITMENT_LEVEL,
          maxSupportedTransactionVersion: 255,
        });
        if (txLanded === null) {
          console.log(
            signature,
            `${new Date().toISOString()} ERROR: tx is not found on RPC within ${SLEEP_MS_RPC}ms. Not sending to VA.`
          );
          continue;
        }
        slotLanded = txLanded.slot;
      }

      // Don't send if the slot latency is negative
      if (slotLanded < slotSent) {
        console.log(
          signature,
          `${new Date().toISOString()} ERROR: Slot ${slotLanded} < ${slotSent}. Not sending to VA.`
        );
        continue;
      }

      // prepare the payload to send to validators.app
      const vAPayload = JSON.stringify({
        time: txEnd - txStart,
        signature,
        transaction_type: "transfer",
        success: signature !== FAKE_SIGNATURE,
        application: "web3",
        commitment_level: COMMITMENT_LEVEL,
        slot_sent: slotSent,
        slot_landed: slotLanded,
      });
      if (VERBOSE_LOG) {
        console.log(`${new Date().toISOString()} ${vAPayload}`);
      }

      if (!skipValidatorsApp) {
        // Send the payload to validators.app
        const vaResponse = await axios.post(
          "https://www.validators.app/api/v1/ping-thing/mainnet",
          vAPayload,
          {
            headers: {
              "Content-Type": "application/json",
              "Token": VA_API_KEY,
            },
          }
        );
        // throw error if response is not ok
        if (!(vaResponse.status >= 200 && vaResponse.status <= 299)) {
          throw new Error(`Failed to update validators: ${vaResponse.status}`);
        }

        if (VERBOSE_LOG) {
          console.log(
            `${new Date().toISOString()} VA Response ${vaResponse.status} ${JSON.stringify(vaResponse.data)}`
          );
        }
      }

      // Reset the try counter
      tryCount = 0;
    } catch (e) {
      console.log(`${new Date().toISOString()} ERROR: ${e.name}`);
      console.log(`${new Date().toISOString()} ERROR: ${e.message}`);
      if (++tryCount === MAX_TRIES) throw e;
    }
  }
}

await Promise.all([
  watchBlockhash(gBlockhash, connection),
  watchSlotSent(gSlotSent, connection),
  pingThing(),
]);