Using Private Data in SAP Hyperledger Fabric

[#1]

Dear SAP Team,

I have been trying out SAP Hyperledger Fabric. I am having a major doubt regarding the use of collections to provide storage and retrieval of private data on the block chain network for authorized peers of organizations. From the Hyperledger docs, I understood the concepts of private data and how to implement it in chain code. The main problem I am facing is I couldn't find a way to provide the "collections_config.json" file.

I tried packing the file in 2 ways:

1.

-- src

----chaincode_name.go

----chaincode_name.yaml

-- chaincode.yaml

-- collections_config.json

2.

-- src

----chaincode_name.go

----chaincode_name.yaml

----collections_config.json

-- chaincode.yaml

and in the Args I tried specifying the path.

But these didn't work. The error is "collection config not define for namespace"

How can I specify this?

[Sangeetha_K1]

Hi Abhinav,

The collections-config.json doesnt have to be deployed along with the main chain code.

In the current [ Fabric 1.3 ] SAP CP Hyperledger service channel instance, after you deploy chaincode, the dashboard shows you the step(button) to "Instantiate" the chaincode . During instantiation step, the dialog has provision to supply /upload the collection-config file.

I have mentioned about it here in my private data overview blog : https://blogs.sap.com/2019/03/11/implement-data-privacy-in-hyperledger-fabric-through-private-collec...

[Former Member]

Abhinav,

don't have an answer and only limited understanding of the fabric, but

what's the sap help file equivalent of this tutorial page: https://hyperledger-fabric.readthedocs.io/en/release-1.2/private_data_tutorial.html#pd-build-json? did you have to modify the 'standard' chaincode to fit the private chain requirements? fabric has a separate chaincode that allows only the authorized peers to view the blockchain 'contents' and that would be invoked and instantiated separately from the plain vanilla one.

thx, greg

[Former Member]

I also only have limited understanding of Fabric. I was not able to find any documentation regarding private data in sap help or documentations. I followed the Hyperledger documentation itself. In my use case I need the private data and the concepts of collections only. I have changed the chaincode to adapt the Private Data as per this documentation: https://hyperledger-fabric.readthedocs.io/en/release-1.2/private_data_tutorial.html#pd-build-json. When the chaincode is getting executed its not able find the collections_config in the specified namesapce.