CODEWITHSUNDEEP
hyperledger-fabrichyperledgerblockchaincryptocurrency
O. Shekriladze
O. Shekriladze

Reputation: 1536

Can I query Hyperledger Fabric ledger or update ledger without chaincode in peer?

I have simple question about Hyperledger Fabric. so here is my question:

I know that for committing peers (ordinary peers) it's not 100% necessary to have chaincode installed, but every peer should have ledger and that's 100% necessary.

so suppose I am committing peer and I have not chaincode installed, but I have ledger of course. Now new block arrives from ordering peer.

1) I should check blocks validity, so I need to query ledger

2) I should add this block, so I need to update ledger.

So how can I do this two above without chaincode? Isn't chaincode necessary for above operations? (query and update)

Upvotes: 0

Views: 638

Answers (2)

Narendranath Reddy
Narendranath Reddy

Reputation: 4133

You cannot query a peer without having a chaincode. Must need chaincode installed in the peer in order to query | invoke.

Hyperledger Fabric has two types of peers 1) Endorsing peers 2) Committing Peers

Endorsing peers must need a chaincode which means you need to install chaincode on endorsing peers because its duty is to make sure the transaction owner has sufficient rights and it simulates that transaction against the ledger for that it needs a chaincode interface in order to complete simulation.

Once the simulation is done it sends back the R/W sets and simulation result to client and client will send this to the orderer

Orderer then distributes to committing peers ( No need to install chaincode)

Whole: Applications generate a transaction proposal which they send to each of the required set of peers for endorsement. Each of these endorsing peers then independently executes a chaincode using the transaction proposal to generate a transaction proposal response. It does not apply this update to the ledger, but rather simply signs it and returns it to the application.

Upvotes: 1

adnan.c
adnan.c

Reputation: 721

To check the transaction/block's validity, the peer does not need to have the chaincode, the readwrite set available in the transaction is compared against the ledger (available in all peer) to decide the validity.

And adding the block to the ledger is not dependent upon the validity check. If it was found invalid, it will still be added to the ledger but with an invalid tag.

Upvotes: 1

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