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block-watcher.md

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Block Watcher

Watches for new blocks and posts them to pusher channels as needed.

Keys for Listening (open to public)

  • Mainnet
    • APP_KEY = 5f97b02d36b8b346ae28
    • APP_CLUSTER = us2
  • Testnet
    • APP_KEY = 9d18ac0afc782753d9a3
    • APP_CLUSTER = us2

These keys only allow you to read the data, not write. Eventually it will require to pass in authentication to use, but for now we are allowing it open usage.

If it is abused we will shut it off...

Listen for events

Node.js

yarn add pusher-js

const Pusher = require('pusher-js');


const socket = new Pusher('APP_KEY', {
  cluster: 'APP_CLUSTER',
  forceTLS: true
});

const channel = socket.subscribe(`block`);
channel.bind('new-block', function(data) {
    console.log("new event", JSON.stringify(data));
})

Browser

<!DOCTYPE html>
<head>
  <title>Pusher Test</title>
  <script src="https://js.pusher.com/4.3/pusher.min.js"></script>
  <script>

    // Enable pusher logging - don't include this in production
    Pusher.logToConsole = true;

    var pusher = new Pusher('APP_KEY', {
      cluster: 'APP_CLUSTER',
      forceTLS: true
    });

    var channel = pusher.subscribe('block');
    channel.bind('new-block', function(data) {
      alert("new event " + JSON.stringify(data));
    });
  </script>
</head>
<body>
  <h1>Pusher Test</h1>
  <p>
    Try publishing an event to channel <code>my-channel</code>
    with event name <code>my-event</code>.
  </p>
</body>

Channels & Events

  • Channel: block
  • Event: new-block - a new block was detected and sent.
{
  "parentHash": "0xb78e7c16b5c5e9d2d718e16aa955f19a85037822508de16130d8c3c353bcafef",
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "miner": "0x0000000000000000000000000000000000000000",
  "stateRoot": "0x8c7f2a2807054b6472c3eeab54c0c53bed2da7a1a287bd6cbaf2a30f9b72742f",
  "transactionsRoot": "0xdeaa2ca4671153d7169de01cf2d408a71b4e9820fe404d3a869c32e5831180d5",
  "receiptsRoot": "0x91e1d128ef7e88d2af7daf8d1256570dfbd4276d2f7c5a9ebc6fbe4a35339dfb",
  "logsBloom": "0x0000000000000000000000000000000800000000000000040000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000000000800000000000000000000000000000000000000000000000000000000000000001000000000000000000000004000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000002000000001000000000000000000000000000",
  "difficulty": "42139895752858863683613906766286934079125325961897347891947632730078514160760743174379778000",
  "number": 33264304,
  "gasLimit": 600000000,
  "gasUsed": 21594,
  "timestamp": "1546029442051573730",
  "extraData": "0x6d0b76357e6b61964c072e316f0eb2f8e03c7dd3b8960e4c598d852862b1212214466f727de8400139380969f0aac6aa5ca5314cdb848ecabd0bc445943287b400",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "nonce": "0x0000000000000000",
  "hash": "0x859276cc4008481b18beb37f0c3a041e00a404cbdc8f9bfeafda6666ce64e7f1"
}
  • Channel: balance
  • Event: <address> - a new transaction was detected and so balance was gotten and sent via pusher for this address.
{
  "balance": "800000000000000000000000",
  "hash": "0x2fec3848da5e69f9ac107c05ffb4ce0f6c0b8e48d8976186a0cdaa731adcac8e"
}
  • Channel: transaction
  • Event: new-transaction - a new transaction was detected and so the tx details was sent to pusher.
{
  "blockHash": "0x43f97b8aef1e4bc430bd00888525069e7e8528109dfb640710c2796c71c9777b",
  "blockNumber": 33264306,
  "from": "0x0C6F72a89446345CBd76c79Bc9edB449825c3B94",
  "gas": 7000000,
  "gasPrice": "0",
  "hash": "0xd9ad7763261b5219cb8d74b9fb6fcfc0417f6a44d3e9412d006a1221c4053f41",
  "input": "0xc885bc58",
  "nonce": 1900,
  "to": "0x8302Bac33AC9c42Ad60C984767cF6426a40D2bab",
  "transactionIndex": 1,
  "value": "0",
  "v": "0x1c",
  "r": "0xefdfde7ab595842b0964751c0ecee381bd983aa7fc09a1eeb78ce7e99d94df4",
  "s": "0x487d738e103fc2996595d428245d234a61e3dc125f1535e0a884516592928cc3"
}
  • Channel: payout
  • Event: new-payout - a new payout transaction was detected, and so we notify this channel with the tx details.
{
  "blockHash": "0x322b085a16a1ab99a538a5fe21af552140ceb0215dd30fb8078f6f85645fa789",
  "blockNumber": 29791496,
  "from": "0x1c6f6e78ad4dfd8d7172467166a8af7d0121b2d4",
  "gas": 599000000,
  "gasPrice": 0,
  "hash": "0xf442ab7bcfdf904050775271c7688fb812296116476679c2892367517f3758db",
  "input": "0xdf6c39fb0000000000000000000000000000000000000000000000000000000000003afc00000000000000000000000000000000000000000000000000000000000007ce",
  "nonce": 7179,
  "r": "0xe18300fce0fdbee43a8b0dd3ae5da627827e0776fbc1dea0b8b52aa539890ac5",
  "s": "0x967dc5d03864a3834cbb7837d083fd6737e5c4f4e81479a8ae355029af32a97",
  "to": "0xd674dd3cdf07139ffda85b8589f0e2ca600f996e",
  "transactionIndex": 0,
  "v": "0x1c",
  "value": 0
}