insert.js

/*
 * SPDX-License-Identifier: Apache-2.0
 */

'use strict';

const { FileSystemWallet, Gateway } = require('fabric-network');
const path = require('path');

async function main() {

    const numberArgs = process.argv.length
    if(numberArgs != 4) {
        console.log(`Error bad number of arguments. Syntax: node invoke.js companyName jsonFilepath`);
        return;
    }
    const companyName = process.argv[2];
    const jsonData = require(process.argv[3]);

    const ccpPath = path.resolve(__dirname, '..', '..', 'network', `connection-${companyName}.json`);

    try {
        // Transaction submission time calculation.
        var start, finish;
        start = new Date();


        // Create a new file system based wallet for managing identities.
        const walletPath = path.join(process.cwd(), 'wallet');
        const wallet = new FileSystemWallet(walletPath);
        console.log(`Wallet path: ${walletPath}`);

        // Check to see if we've already enrolled the user.
        const userExists = await wallet.exists(`user${companyName}`);
        if (!userExists) {
            console.log(`An identity for the user "user${companyName}" does not exist in the wallet`);
            console.log('Run the registerUser.js application before retrying');
            return;
        }

        // Create a new gateway for connecting to our peer node.
        const gateway = new Gateway();
        await gateway.connect(ccpPath, { wallet, identity: `user${companyName}`, discovery: { enabled: true, asLocalhost: true } });
        // await gateway.connect(ccpPath, { wallet, identity: 'admin', discovery: { enabled: true, asLocalhost: true } });
        // Get the network (channel) our contract is deployed to.
        const network = await gateway.getNetwork('mychannel');

        // Get the contract from the network.
        const contract = network.getContract('fabcar');

        // We format each reading into a string and store them into a tab. Each entry is a reading.
        var jsonDataAsAStringTab = [];
        for (const reading of jsonData) {
            jsonDataAsAStringTab.push([reading.SensorType + " " + reading.Timestamp + " " + reading.Unit + " " + reading.DeviceID + " " + reading.Value]);
        }

        // 'pushData' is the 'createCar' from fabcar.
        // The slightly altered chaincode function still works, as tested on single machine network
        await contract.submitTransaction('pushData', jsonDataAsAStringTab.toString());

        finish = new Date();
        console.log("Data inserted. Elapsed time: " + (finish.getTime() - start.getTime()) + " ms");

        // Disconnect from the gateway.
        await gateway.disconnect();

    } catch (error) {
        console.error(`Failed to submit transaction: ${error}`);
        process.exit(1);
    }
}

main();