libcardano v1.4.27

Cardano Node JS

Components:

1.Interceptor

It intercepts connection between two cardano-nodes. The communication is logged with decoded protocol messages.

example:

##
## [[ Node1 ]] ----->>  [127.0.0.1:3001  [[Interceptor]]] ----->> [172.31.0.15:3002  [[Node 2]]]
##
yarn interceptor 0.0.0.0:3001 172.31.0.15:3002

2.Client

Attempts connection to remote node and

• maintain connection with it with periodic ping
• log all the communication to/from the server

example:

yarn client preview-node.world.dev.cardano.org:30002

3. Using As a Library

3.1 Following a node for latest transactions.

import { createInMemoryClientWithPeer } from "libcardano/helper";
import { parseRawBlockBody } from "libcardano/cardano/ledger-serialization/transaction";
import * as process from "process";

const blockchain = createInMemoryClientWithPeer(process.argv[2] || "sanchonet-node.play.dev.cardano.org:3001", {
  networkMagic: parseInt(process.argv[3]) || 4,
  startPoint: "Latest",
});

blockchain.on("extendBlock", (block) => {
  const transactions = parseRawBlockBody(block.body);
  console.log(
    "RollForward :", block.headerHash.toString("hex"),
    "blockNo:", block.blockNo,
    "slotNo:",  block.slotNo,
    "txCount:", transactions.length
  );
});

blockchain.pipeline("rollback", ([[slot, headerHash], blockNo], _currentTip, cb) => {
  console.log("Rollback    :", headerHash.toString("hex"), "blockNo:", blockNo, "slotNo:", slot);
  setImmediate(cb);
});