we are wondering where can we find a production quality sample for HL Fabric? we have studied the samples included with official release and have found that:
the balance-transfer sample shows how to write a HL Fabric app and make transactions and queries on the chaincode but uses the cryptogen tool which is not recommended for use in production
The fabric-ca app on the other hand shows how to spin up a network without using cryptogen but does not show how to write an app that can then be used to do transactions, make queries, enroll new users and so on
So we are looking for a sample that combines the best of above two apps. Does such a sample exist? Writing an app to get the benefits of both turned out to be harder than we thought e.g., fabric-ca sample does not output any network-config which is needed by balance-transfer and we are facing difficulty figuring out what the network-config should look like in this case. Also we see conflicting code between node and typescript in balance-transfer (although both are javascript) etc.
In the latest master of Hyperledger Fabric, there is a new and much more detailed sample--the commercial paper.
The tutorial covers the whole lifecycle of a chaincode.
Related
I'm trying to use DIDs/VCs from hyperledger Indy with Hyperledger Fabric. Simply I want to replace Fabric's certificate based identity/MSP with DIDs/VCs. However, as far as I understand this is not direct. The existing code based have lots of dependencies on Fabric-CA. Could someone help me to figure out potential starting points to do this customisation?
you cant try to use this modified peen-node:
https://github.com/trustbloc/fabric-mod
https://github.com/trustbloc/trustbloc-did-method/blob/main/docs/spec/trustbloc-did-method.md
or read this research:
https://arxiv.org/pdf/2104.03277.pdf
or check other did:methods that support HLF:
https://www.w3.org/TR/did-spec-registries/
or look to this project:
https://github.com/BLOCKOTUS/blockotus-organism
Currently, the only framework that can verify DID/VCs from Hyperldeger Indy is the Hyperledger Aries. There are several projects where people are trying to integrate either some of the Indy or Aries functionalities into Fabric in order to be able to issue and verify DID/VCs.
Take a look at the following projects in the "Hyperledger Mentorship Program" community:
Hyperledger Fabric - Hyperledger Aries Integration to support Fabric as Blockchain ledger
Or an older project Extending HL Fabric for connecting with HL Indy.
However, the easiest way is to have two DLTs, one for DID/VCs issue and verification (Indy), and one for transactions, etc.
I've been studying the Hyperledger Fabric framework reading the docs for quite a while now but I'm getting a little lost in the middle of all that info. My question is: Is there any guidelines/"Step by step" on how to design a blockchain network from scratch? If you are starting a new project, where do you start?
Because I think I would understand it way more quicker if I actually started coding a little instead of reading and reading and reading...
Thanks a lot!
Edit 1:
I've chosen #kekomal answer as the correct one but I'd like to thank #Isha Padalia for the awesome VS Code extension and tutorial.
If you are really interested in learning and diving into Hyperledger Fabric, avoid byfn script. It performs a lot of magic for building a very simple Hyperledger Fabric network. After that, you have a network that you don't know how has been created and you have absolutely no idea of how to start deploying your custom network. There are daily questions here from people who started that way and are absolutely lost.
I find interesting this tutorial: https://medium.com/beyondi/setup-the-hyperledger-fabric-network-from-scratch-b82913b47549. Take into account that it is a little bit outdated.
You can complement it with this newer tutorial: https://www.blockchainexpert.uk/blog/how-to-deploy-hyperledger-fabric-network-from-scratch. Don't only run the steps. Analyze the files in https://github.com/blockchain-expert/hyperledger-fabric-network-from-scratch. Try playing with configtx.yaml, crypto-config.yaml and docker-compose files to customize your network and understand what you are doing.
Customize your organizations, your consortiums, your ordering service, your peers... Create your channels, join them, update your anchor peers... And understand what you are doing.
After that, if your network had one orderer, deploy a new one with more than one (with Raft consensus). If your network was using cryptogen, deploy a new one using Fabric-CAs instead. Or you can follow by playing with chaincodes.
NOTE: Apart from Hyperledger Fabric itself, it is essential to have basic notions of docker and PKI.
You are a beginner in Hypelredger fabric development then you have first cleared the concept of the orderer, peer, CA, and organization concept. And then first you have to start IBM Blockchain Platform VS Code extension for fabric. It will provide a local fabric environment to create, test and deploy a fabric smart contract. Also generate 1 peer, 1 orderer, 1 CA service under VS code environment.
Here is a link to start development with VS code extension.
Hope it will help you:)
hi #d3v9 start from here https://hyperledger-fabric.readthedocs.io/en/release-1.4/build_network.html. also you can find some great article on medium
I'm playing around with Hyperledger and am trying to figure to figure how to set up the server with REST api for chaincode defined here https://openblockchain.readthedocs.io/en/latest/API/CoreAPI/#rest-api
Unfortunately many of the links are dead, so I'm not sure how to set it up. I understand the query language, I just don't knopw how to begin the web server.
Does anyone have any ideas?
Hyperledger Fabric v1.0 and later does not provide a native REST API for interacting with peer and/or orderer nodes. If you have not done so, I'd advise taking a look at http://hyperledger-fabric.readthedocs.io/en/release-1.1/ to better understand the current Fabric architecture.
There is a project to provide a REST API server in front of Fabric nodes. It was not updated to support Fabric v1.1 (at least not yet) but does support Fabric v1.0 and should provide at least an example of how to add a REST API in front.
I'd also advice taking a look at the samples which are documented here as well. The fabcar sample provides a nice, simple example of how to connect a Node.js application to Fabric.
I am new to hyperledger and bit confused about hyperledger composer & nodejs api.
I saw using composer we can create assets, transactions, participants and chaincode and in last we have to archive it this all into .bna file and finally we deploy this chaincode into network using admin card
But at other end using NodeJs API we can also write chaincode by overiding init & invoke methods.
How can we relate these all.
The best way to think about this is the following:
1) Hyperledger Fabric v1.1 supports writing chaincode in two languages: Golang and JavaScript via Node.js
If you want to do all of the heavy lifting yourself, you can write straight chaincode.
2) Hyperledger Composer provides a higher-level model-driven language for developing smart contracts. It currently only allows deployment of these artifacts to Hyperledger Fabric. It also happens to support writing functions in JavaScript as well.
So if you want to start from a higher-level model-driven approach, Hyperledger Composer is the way to go. If you want to write all of the plumbing yourself or use very low-level chaincode features, then using chaincode itself is the way to go.
Moving forward, we are looking at a better way to move between the two and not force a decision / direction up front.
There is another option, we develop a framework called Convector to be in the middle of Composer (high abstraction, low control) and raw code (low abstraction, high control, therefore high risk). We open sourced it a few days ago. At WorldSibu we don't like loosing so much control over our code like with Composer but as Gari Singh was saying, doing all the heavy lifting for each project is crazy. It is like a Mongoose for Hyperledger Fabric. It may help to check it out.
It is also worth noting that, according to IBM, Composer is no longer recommended as a production solution, but only for prototyping. In HLF 1.3, chaincode can now be written in Go, Javascript and Java.
I have been working on hyperledger fabric for some time. But I don’t understand where hyperledger composer comes in place . I do understand that it helps in visualizing the logic and transaction. But what I don’t get is how do you integrate it with fabric network? what does it create? Is it chaincode if not then what?
The Compose runtime is chain code that executes the business network archive artefacts created by the end-user.
Perhaps this will help?
https://blog.selman.org/2017/07/08/getting-started-with-blockchain-development/
The tech answer is that Hyperledger Composer is an abstraction layer over Hyperledger Fabric.
The practical answer is that it is awesome. Think how Angular and hundreds of other frameworks make web programming easier.
It is a framework where you can write your blockchain in Javascript and specify your data objects in an easy to understand text file. Throw in some querying, ACL stuff and pathways to use some nice opensource tools that let you do things like generate a Web API automatically and play around in a web environment without installing anything.
We are using it for the Integra Ledger Legal blockchain. (www.integraledger.com). I just spent the day working in it.