Introduction to Block Stream

Block Stream is a powerful library that allows developers to work with blockchain streams efficiently. It provides various APIs for interacting with data streams. Below we provide an introduction to the library and several useful APIs accompanied by code snippets to illustrate their usage.

API Examples

1. Initializing Block Stream

  
    const BlockStream = require('block-stream');
    const blockStream = new BlockStream();
  

2. Connecting to a Blockchain Network

  
    blockStream.connect("wss://example.com/blockchain");
  

3. Listening for New Blocks

  
    blockStream.on('block', (block) => {
      console.log('New block received:', block);
    });
  

4. Filtering Transactions

  
    blockStream.filter('transactions', (tx) => tx.value > 1000).on('data', (tx) => {
      console.log('High-value transaction:', tx);
    });
  

5. Handling Errors

  
    blockStream.on('error', (err) => {
      console.error('Error:', err);
    });
  

6. Subscribing to Specific Addresses

  
    blockStream.subscribe('address', '1A2b3C4d').on('transaction', (tx) => {
      console.log('Transaction for address:', tx);
    });
  

7. Unsubscribing

  
    blockStream.unsubscribe('address', '1A2b3C4d');
  

Complete Application Example

Below is a complete example showcasing the usage of Block Stream to monitor transactions and blocks in a blockchain network.

  
    const BlockStream = require('block-stream');
    const blockStream = new BlockStream();

    // Connect to the network
    blockStream.connect("wss://example.com/blockchain");

    // Listening for New Blocks
    blockStream.on('block', (block) => {
      console.log('New block received:', block);
    });

    // Filter and Listen for High-Value Transactions
    blockStream.filter('transactions', (tx) => tx.value > 1000).on('data', (tx) => {
      console.log('High-value transaction:', tx);
    });

    // Subscribe to Specific Address Transactions
    blockStream.subscribe('address', '1A2b3C4d').on('transaction', (tx) => {
      console.log('Transaction for address:', tx);
    });

    // Error Handling
    blockStream.on('error', (err) => {
      console.error('Error:', err);
    });

    // Unsubscribe Address
    setTimeout(() => {
      blockStream.unsubscribe('address', '1A2b3C4d');
    }, 60000); // Unsubscribe after 1 minute
  

By following this guide, developers can leverage the full potential of Block Stream to build powerful blockchain-based applications.

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