On Sep 30, 2021, at 5:47 AM, J K via lists.hyperledger.org <jsjkj434=yahoo.com@...> wrote:



There's a new one called Fablo, I tried it, it is good and gives you the flexibility of creating what you need, even if it is bare minimum.

GitHub - softwaremill/fablo: Fablo is a simple tool to generate the Hyperledger Fabric blockchain network and run it on Docker. It supports RAFT and solo consensus protocols, multiple organizations and channels, chaincode installation and upgrade.

GitHub - softwaremill/fablo: Fablo is a simple tool to generate the Hype... Fablo is a simple tool to generate the Hyperledger Fabric blockchain network and run it on Docker. It supports R...

Cheers

On Sunday, 19 September, 2021, 05:27:12 pm IST, Nicholas Leonardi via lists.hyperledger.org <nlzanutim=yahoo.com@...> wrote:

Accidently sent without the link, here it is

GitHub - lepar/hyperledger-fabric-generic-network: A hyperledger fabric generic network with production ready components to be used as a reference or starting point

GitHub - lepar/hyperledger-fabric-generic-network: A hyperledger fabric ... A hyperledger fabric generic network with production ready components to be used as a reference or starting poin...

Em domingo, 19 de setembro de 2021 01:33:02 BRT, mhdalkhaldibc@... <mhdalkhaldibc@...> escreveu:

I'm trying to trim down fabric. My use case is simple, basic token transfer with utxos, so I want to simplify and remove features and components I'm not using. I will most likely have one org, one ca, and no special endorsement policies.
Could you please help me find some relevant resources to look at?

Thanks

In my case, we had to create our own API for installing, instantiating and upgrading chaincodes and HLF clients.

 

Regards,

 

Marcos Sarres | CEO | +55 61 98116 7866

 

 

De: fabric@... <fabric@...> Em nome de Nikos Karamolegkos
Enviada em: quinta-feira, 30 de setembro de 2021 10:16
Para: fabric <fabric@...>
Assunto: [Hyperledger Fabric] install chaincode using API

 

Hello, as I have seen I can install a smart contract to a peer by running to peer:

peer lifecycle chaincode install ...

In case I want to install or update a chaincode using a Web UI can I do that by using the API?

Thank you,

-- 

Nikos Karamolegkos

R & D engineer at ICS-FORTH

Telecommunications and Networks Lab (TNL)

 

-- 

Nikos Karamolegkos

R & D engineer at ICS-FORTH

Telecommunications and Networks Lab (TNL)

Thank you for your reply.

I'm trying to set the composite key.

I know that i can retrieve the ID of the user who is launching the transaction in this way : 

String userId = ctx.getClientIdentity().getID();

Now I need to create a composite key to make a search with this ID and the plate number. The GetHistoryForKey() accept a String so i tried this way:

String[] keyAttribute = {userId,plateId};
String compositeKey = ctx.getStub().createCompositeKey("user-plate",keyAttribute).toString();

QueryResultsIterator<KeyModification> queryResult = ctx.getStub().getHistoryForKey(compositeKey);

but this way I'm not able to retrieve any transaction.

If I use only the plateId in the getHistoryForKey() it works fine so the problem is in the creation of the composite key.

Could you tell me what I'm doing wrong?

Thanks

Il giorno gio 30 set 2021 alle ore 15:05 David Enyeart <enyeart@...> ha scritto:

You can use chaincode API GetHistoryForKey() to retrieve all historical transactions associated with a key. Therefore if you make your key the number plate, or number plate and user id concatenated as a composite key, you can retrieve what you need.

If you need more advanced queries, then the recommendation is to use the block events to build out your own fit-for-purpose data store that can be queried, as seen in this sample: https://github.com/hyperledger/fabric-samples/tree/main/off_chain_data


Dave Enyeart

"famar" ---09/30/2021 06:12:31 AM---Hello everyone, I'm trying to develop chaincode in java.

From: "famar" <fabrizio.marangio@...>
To: fabric@...
Date: 09/30/2021 06:12 AM
Subject: [EXTERNAL] [Hyperledger Fabric] Retrieve transaction details
Sent by: fabric@...

---

Hello everyone, I'm trying to develop chaincode in java. I would like to search for a transaction in hyperledger fabric, filtering against the person who launched it and the ID it refers to. For example, let's say we have a generic car asset ZjQcmQRYFpfptBannerStart 
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Hello everyone,
I'm trying to develop chaincode in java.

I would like to search for a transaction in hyperledger fabric, filtering against the person who launched it and the ID it refers to.
For example, let's say we have a generic car asset with the number plate as a parameter.
I would like to be able to search for all the transactions made by a user, filtering them by that number plate, and then retrieve the timestamp of the last one made.
Can anyone help me with this?

Thank you.

On Oct 3, 2021, at 12:03, Mark Anthony Morris <mark.morris@...> wrote:



Hello All, I recommend this new O’Reilly book, I co-authored. It is available at Amazon, O’Reilly, and others. 

It will help your learning and development:

Hands-On Smart Contract Development with Hyperledger Fabric V2: Building Enterprise Blockchain Applications

Amazon:
Learn more: https://www.amazon.com/dp/1492086126/ref=cm_sw_em_r_mt_dp_8QP2R4WFE6NS505Y0CMJ

Google Books:

https://www.google.com/books/edition/Hands_On_Smart_Contract_Development_with/-D7kzQEACAAJ?hl=en&kptab=getbook

<PastedGraphic-1.png>

Sincerely,

Mark Anthony Morris

----- Original message -----
From: jefferson.rs@...
Sent by: fabric@...
To: fabric@...
Cc:
Subject: [EXTERNAL] [Hyperledger Fabric] Private data dissemination for new peers from the same org after joining an existing channel in HLF 2.x #fabric-peer
Date: Fri, Oct 1, 2021 10:22 PM
 
Hi everyone. I'm doing some testing over the use of private data and I've got into a doubt which should be the default behaviour in HLF 2.x. Assuming a network with 2 orgs (orgA and orgB) and each org have one peer (peer1.orgA and peer1.orgB): ZjQcmQRYFpfptBannerStart

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Hi everyone.

 

I'm doing some testing over the use of private data and I've got into a doubt which should be the default behaviour in HLF 2.x.

 

Assuming a network with 2 orgs (orgA and orgB) and each org have one peer (peer1.orgA and peer1.orgB): there's a chaincode installed in the channel with explicit private collection defined where each org have it's own private collection (collectionOrgA and collectionOrgB) with the following configurations: 

  memberOnlyRead: true, 

  memberOnlyWrite: false, 

  requiredPeerCount: 0,

  maxPeerCount: 3

 

I've executed one TX that runs a PutPrivateData to collectionOrgA and another TX to collectionOrgB. So the private data were stored successfully.

 

Later on I up a new peer to orgA (peer2.orgA) and I've executed the join operation for this peer to this channel. After the join, I've noticed that this node didn't received any private data back just the hashes.

 

So I've got these doubts: 

1) Is this the expected behaviour in HLF 2.x? 

2) Would it be possible for a new peer that joins the channel to get this private data that belongs to his own org (in this case orgA)? If so, which would be the setup to enable this?

 

Thanks in advance,

Jeff.