Tech Tuesday: How to Write and Deploy Chaincode for Hyperledger Fabric

If you’re a blockchain developer using Hyperledger Fabric, you’ve heard about chaincode. In this Tech Tuesday, Jim Zhang, Kaleido co-founder and Head of Protocol, will take you through everything you need to know to write and deploy chaincode, including:
How Fabric chaincode design differs from other smart contract platforms such as Ethereum
Best practices for writing and testing chaincode
How Kaleido simplifies developing with chaincode
By the end of this webinar, you will have the knowledge and skills to write and deploy your own chaincode on a Hyperledger Fabric network using the Kaleido platform.
Try Hyperledger Fabric on Kaleido free at www.kaleido.io...
Learn more about Chaincode at www.kaleido.io...

[@ainsteinsbr3484]

Hi Jim.. excelent video. A question I couldn't fi d the answer. When I install a chaincode as a service, I can change the code live. Is there a way to avoid this?. I mean, if I install it, even "as a service", I protect the node chaincode to be updated without all members kwnow it?

[@Kaleido-io]

thanks for your comment! It is indeed the case that when a chaincode is deployed in the "chaincode-as-a-service" style, there is no guarantee that the logic executing in the external chaincode service will be immutable. But that's not an issue with the Fabric transaction model design. Unlike other protocols like Ethereum, which requires smart contracts to be immutable so as to guarantee determinism, Fabric's "execute-order-commit" design does not depend on smart contracts to be uniform across all nodes. As a result, chaincode administrators in each organization are free to deploy their own implementations. They are expected to produce the same result from the same starting state and the same input, but if they don't, it's not the end of the world like in other protocols. For the same reason, a chaincode administrator is free to update their chaincode service independent of the others in the channel. If you are interested in learning more about the differences in DLT protocol designs, here's a blog on our website: www.kaleido.io/blockchain-blog/enterprise-blockchain-protocols-a-technical-analysis-of-ethereum-vs-fabric-vs-corda

[@manomite3544]

Is it possible to use PHP to design a chaincode? If yes... Can an example be provided please

[@Kaleido-io]

thanks for your comment! To develop a chaincode, you need the shim library that can communicate with the peer node. Unfortunately the shim is only available in golang, node.js and Java at this point.

[@rakeshreddyabbireddy8876]

how to send using transientMap for private data collection . In swagger API also i cant find anything. can you pls help me.

[@Kaleido-io]

Hey Rakesh, assuming you're asking about transientMap support in FabConnect what you'll want to do is: add a “transientMap” property in the transaction payload, peer to the other standard properties like “func”, and “args”. The “transientMap” is a *map[string]string* property. If you have any questions about that, feel free to reach out to [e-mail] or on the Kaleido discord at discord.gg/26B5rgWuxA

[@Petit_Mbenya]

Hey ! can you provide your email ? or linkedin ?

[@Kaleido-io]

www.linkedin.com/company/kaleido-io/