Is it alright to use hyperledger composer for a professional project? Since its depreciated.
I have need to solve a problem which can be solved easily with hyperledger composer. My main question is Is it wise to use composer after its been depreciated. Will there be any deployment Issue or anything while im carrying out this project?
I would highly advise you not to try to use hyperledger composer. It is end of life and the community has moved on, all that is left is the source code. The fabric client sdks and the new programming models on the chaincode side provide a much richer experience now and that is where you should focus your efforts.
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I am building a XCFramework for my company and the primary purpose is to expose our data for clients using this Framework. Clients can access data using this Framework through use-cases without knowing the implementation details.
This Framework needs a very high run-time maintenance support as we may have to add or update the use-cases based on clients requests or changing busing requirements. It's very important to design an automated solution to deploy new changes and make the updated Framework available for clients. I'm looking to host SDK somewhere so I can build and deploy it. Something like maven for Android. But I've not found some good solution yet.
I would love to hear if someone has similar experience or if someone can guide for a better solution. Thanks
I'm developing a blockchain based system to provide energy certificates handled as tokens in hyperledger fabric. I've been doing some research but found no state of art on how to do this. If anyone can provide a useful link on how to bring this use case into hyperledger fabric tokens, I would be grateful. Also, I don't really know how to include the fabtoken functionality in an already deployed blockchain network. Any links or tips on how to start investigating for this will be welcome.
fabtoken was included in the fabric v2.0 alpha, but was reverted from git due to several issues. In other words, it is a method that is no longer supported.
Currently, fabric provides an example implemented in chaincode as a related token. See the link below.
fabric-samples/token-utxo
fabric-samples/token-erc-20
fabric-samples/token-erc-721
I'm currently working on performance benchmarking using Hyperledger Caliper.
I have tried several samples but it seems that the structure of sample benchmarks are different from that of a business network made on Hyperledger Composer.
Looks like model file and script file are all reproduced into one javascript file as a benchmark.
Could anyone tell me how to test my own business network made on Hyperledger Composer?
Or, Should I reproduce my business network into one javascript file?
I looked at the official website (https://hyperledger.github.io/caliper/)
But, it seems that it is not updated because codes on the website don't work.
Thank you!
I have previous experience in using Ethereum and Solidity, but now I want to try writing smart contracts for Hyperledger.
I have few considerations:
First one is regarding supported databases. According to their documentation (http://hyperledger-fabric.readthedocs.io/en/latest/ledger.html) they use LevelDB for storing contract data and CouchDB support is still in beta. Does anyone have any experience using CouchDB in Hyperledger?
Second, I see that Go is mostly used for the specification of smart contracts, but they have support for Java too. Is Java still in beta too, and is there support for any other programming language?
Also, what operating system do you suggest for production server running Hyperledger?
Thank you for the answers.
Is Java still in beta too, and is there support for any other
programming language?
Hyperledger V1.0 doesn't support Java Chaincode.
There will be support for it in the future.
You can ask around in https://chat.hyperledger.org/channel/fabric for ETAs.
There is also a work in progress to have node.js support.
Also, what operating system do you suggest for production server
running Hyperledger?
Ubuntu 16.04 LTS works well
Does anyone have any experience using CouchDB in Hyperledger?
Yes, CouchDB works well if your data is modeled as JSON and you would like to query the content of the data. The default goleveldb state database only supports key-based queries.
You should take a look at Hyperleger Composer that helps you create blockchain applications on Hyperledger Fabric quite easy. (It works better with Ubuntu).
It has is own Modeling Language.
Hyperledger initially was build using Go language.
the aim of the hyperledger team is to support as many languages as possible. currently the hyperledger composer( tool for developing blockchain application) supports javascript for defining the assets, transactions and chaincode.
the transactions log, state data and backed by Level DB and Couch DB
Note :
LevelDB and CouchDB are fully integrated in fabric framework,
currently you can't replace them with other database
Chaincode runs in a secured Docker container, the chaincode (aka smart-contract)can be programmed in Go,Node,Java currently Go is stable and fully supported language.
considering the operating system i have tested the fabric network running on Microsoft Azure platform where created a image of ubuntu 16.04 and installed Fabric framework.till now got no issue on it.
sorry, i am just beginner student studying fabric and . please, understand me, i do not use English well.. just i'm confused.. who is the application that was explained in http://hyperledger-fabric.readthedocs.io/en/latest/write_first_app.html?highlight=node.js%20SDK for? client or just for invoking Systematically?
if the application is for invoking, any language is okay for coding client-side application?
The Writing your first application tutorial in Hyperledger Fabric's documentation is oriented to the application developer. It specifically targets a developer leveraging the Hyperledger Fabric SDK for Node.js. There are other language-specific SDKs available (e.g. Java) and others in development (Go and Python). There is also a command-line capability to interact with a Hyperledger Fabric blockchain network.