Скачать или смотреть Fixing Registration Errors & Validating Chaincode Execution in Hyperledger Fabric - Chapter 17

#blockchain #ethereum #hyperledger #project #web3 Akshay Kurhekar
In this chapter, we debug and fix a critical issue preventing the register API from working in our Hyperledger Fabric Node SDK setup. You’ll see how to identify mismatched affiliations, validate wallet certificates, and correct attribute-level access control in the Node service layer.

We verify the entire flow end-to-end:
Check Fabric containers & chaincode deployment
Fix incorrect affiliation (department → department1)
Validate user certificates in the wallet
Successfully register donors
Generate badges with QR + upload to IPFS
Register NGOs using NGO admin credentials
Retrieve NGO & donor data from the network
Register banks and validate roles
Create funds using the fund smart contract
Debug “stub undefined” chaincode errors
Redeploy chaincode using sequence upgrades in Fabric 2.5
Confirm updated chaincode containers
Run deep-level debugging inside chaincode with logs

This is one of the most important debugging-focused chapters in the series — showing how a production-grade Fabric system is built, diagnosed, and corrected.

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❤️❤️Timeline - Topic Covered 🚀❤️
0:00 - Intro
00:00 – Intro & Recap

Review of last chapter and context for the registration failure.
Shows chaincode containers running via Docker.

00:40 – Identifying the Root Cause

Issue traced to script mismatch in affiliation.
department should be department1.

01:15 – Fixing Affiliation & Attributes

Updates service file to use correct affiliation values.
Explains why affiliation needs to match CA configuration.

02:10 – Registering Admin & Users

Registers government admin, NGO admin, and government user.
Confirms wallet entries.

02:50 – Running Node Server

Starts Node SDK on port 5000 using npm run dev.

03:20 – Testing Register Donor API

Registers donor (Akshay) → generates badge → uploads to IPFS.
CID returned successfully.

04:15 – Verifying Generated Badge

Opens badge via IPFS gateway.
Displays donor name, role, timestamp, and QR code.

04:50 – Fetching Donor Data

Tests get all donors, get donor by ID.
Multiple donors tested (Akshay, Bob).

06:00 – Registering NGOs

Explains requirement for NGO admin users (not only org-level admins).
Creates registerNGOAdminUser.js script.

07:00 – Generating NGO Admin User

Runs script → wallet entry created.
NGO registration now possible.

07:35 – Testing Register NGO API

Creates NGO entries.
Debugs CID object mapping.
Fixes IPFS link extraction.

08:30 – Verifying NGO Badges

Opens both NGO badges from IPFS.
Shows NGO name, address, role, QR, and timestamp.

09:10 – Registering Banks

Government admin registers banks (e.g., SBI Pune).
Badge generated & uploaded.

10:00 – Attempting Fund Creation

NGO user invokes createFund API.
Error occurs:
“Cannot read properties of undefined (reading 'stub')”

10:40 – Debugging Fund Chaincode

Adds logs in chaincode (fundContract.js) around:

assetExists

fund key

fund object

context

11:30 – Redeploying Chaincode (Sequence Upgrade)

Uses Fabric 2.5 upgrade process:

Keep same chaincode name

Increase sequence and version

Deploy new package

12:10 – Verifying New Chaincode Container

Docker shows updated container with new startup timestamp.
Old logs cleared; new logs visible.

12:40 – Retesting createFund API

Chaincode logs appear correctly for fund existence check.
Error confirmed to originate in chaincode.

13:00 – Deep Dive Debugging

Works through fund contract logic, comparing with working user contract logic.
Identifies missing or misaligned context handling inside contract.

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