Fabric Gateway Ruby SDK RFC

[jonmchan]

Happy New Year everyone! I'm very happy to share that I have finished an initial port of the Hyperledger Fabric Gateway SDK to ruby. Would love to get some feedback on the implementation.

https://github.com/EthicalIdentity/fabric-gateway-ruby

My key objectives were:

1. Follow the node, go, and java implementations such that one reading the documentation would be able to make the same or very similar calls in ruby.
2. Create an idiomatic ruby version of the SDK

Key similarities:

• The main methods and method signatures for gateway, network, and contract are mostly the same.
• The hierarchy of classes remain the same Gateway.new(signer_identity, client).new_network('mynetwork').new_contract('basic').evaluate_transaction('GetAllAssets')
• The main calls for interacting with gateway Contract#Evaluate, Contract#Submit, Contract#EvaluateTransaction, Contract#SubmitTransaction are the same.

Key differences:

• Ruby favors a highly encapsulated form of OOP; Instead of builders and passing primitive objects, I took the approach to utilize objects to encapsulate and represent the entities being built.
  • For example, ProposedTransaction is able to build itself instead of being built inside proposalBuilder; The encapsulated Envelope object provides accessors to everything instead of having TransactionParser to decompose the Transaction Envelope.
  • A network receives a gateway object instead of the identity and client object, a contract receives the network, etc.
• Transaction and Submitted Transaction have been combined into a single object

Pending Features:

• Async submit calls have not yet been implemented.
• Chaincode event monitoring
• Offline signing support is mostly there, but not officially supported through a scenario test.

Am I missing anything or is there anything off spec that could be improved? Thanks for looking!