@siglesiasg/node-red-hyperledger-fabric-gateway/src/nodes/channel/fabric-block-info.ts

Hyperledger Fabric 2.x nodes for node-red with latest fabric-gateway library

import { Node, NodeAPI, NodeMessageInFlow } from 'node-red';
import { closeConnection, invokeChaincodeGeneric } from '../../libs/fabric-functions';
import { getConfigValidate } from '../../libs/node-red-utils';
import { buildConnectionConfig } from '../../models/connection-config.model';
import { buildBlockDecoder } from './../../libs/fabric-decoder';
import { FabricBlockInfoDef } from './fabric-block-info.def';
import { handleError } from './../../libs/fabric-error-handler';

export = (RED: NodeAPI): void => {

  RED.nodes.registerType('fabric-block-info', fabricGetBlockNode);

  function fabricGetBlockNode(this: Node<FabricBlockInfoDef>, config: FabricBlockInfoDef) {

    RED.nodes.createNode(this, config); // First line always!

    const connection = buildConnectionConfig(RED, config);
    const fabricChannelDef = getConfigValidate(RED, config.channelSelector);
    const blockDecoder = buildBlockDecoder(fabricChannelDef.channel);

    this.debug('Fabric Get Block By Number Node Created');
    this.status({ fill: 'green', shape: 'dot', text: 'Ready' });

    this.on('input', async (msg: NodeMessageInFlow, send, done) => {

      try {

        this.status({ fill: 'yellow', shape: 'dot', text: 'Querying...' });

        let transactionName;
        let transactionArgs;

        if (config.method === 'number') {
          transactionName = 'GetBlockByNumber';
          transactionArgs = [fabricChannelDef.channel, config.blockNumber];

        } else if (config.method === 'hash') {
          transactionName = 'GetBlockByHash';
          transactionArgs = [fabricChannelDef.channel, config.blockHash];

        } else if (config.method === 'txId') {
          transactionName = 'GetBlockByTxID';
          transactionArgs = [fabricChannelDef.channel, config.txId];
        } else {
          throw new Error('Config method invalid: ' + config.method);
        }

        await invokeChaincodeGeneric(RED, this, msg, blockDecoder, 'evaluate', connection, config.channelSelector, 'qscc', transactionName, transactionArgs);

        this.status({ fill: 'green', shape: 'dot', text: 'Done' });

        send(msg);
        done();

      } catch (error: any) {
        handleError(this, done, error);
      }

    });

    // removed -> "Node disabled / deleted" | !removed -> "Node is reestarted"
    this.on('close', async (removed: boolean, done: () => void) => {
      await closeConnection.call(this, connection, done);
    });

  }
}