行业区块链服务哪个好

'use strict';

const shim = require('fabric-shim');

class SimpleChaincode {
    async Init(stub) {
        console.info('=========== Instantiated chaincode ===========');
        return shim.success();
    }

    async Invoke(stub) {
        let ret = stub.getFunctionAndParameters();
        console.info(ret);

        if (ret.fcn === 'set') {
            return this.set(stub, ret.params);
        } else if (ret.fcn === 'get') {
            return this.get(stub, ret.params);
        }

        throw new Error('Invalid function name.');
    }

    async set(stub, args) {
        if (args.length !== 2) {
            throw new Error('Incorrect number of arguments. Expecting 2');
        }
        await stub.putState(args[0], Buffer.from(args[1]));
        return shim.success();
    }

    async get(stub, args) {
        if (args.length !== 1) {
            throw new Error('Incorrect number of arguments. Expecting 1');
        }
        let value = await stub.getState(args[0]);
        return shim.success(value);
    }
}

shim.start(new SimpleChaincode());