David/proposer offchain

[druiz0992]

Fixes #524

This PR includes a proposer that exports two endpoints:

• GET /healthcheck
• POST /proposer/offchain-transaction to receive offchain transactions from users. The proposer will forward transactions received through this endpoint to optimist endpoint

Additional changes included are:

• When a proposer registers, it now needs to provide its API URL so that the URL is recorded in the proposers contract. The proposer needs to have two endpoints implemented:
  • GET /healthcheck
  • POST /proposer/offchain-transaction
• nightfall-client/src/routes/peers have been deleted, as the functionality is not used anymore. However, there is a function in nightfall-client/src/services/peers.mjs getProposers that return the next N proposers and the URLs so that a user can forward transactions directly. The URLs from proposers are extracted from proposers.sol contract directly.
• Off chain transactions have been added to cli
• Increased gas limit in proposer tests as a result of adding a url
• New updateProposer(url) method added to SDK to update proposer's URL
• Proposer can not be launched with two optional parameters
  • --proposerUrl : URL where API is located (http://172.16.238.1 by default, so that containers can communicate with it directly)
  • --proposerPort: Port where proposer is launched (8100 by default)

To test changes, simply run ping-pong test. If has been modified to alternate between onchain and offchain transactions. You can also test direct transactions with cli tools (launching ./nf and requesting offchain transactions).

NOTE: I had to merge PR with #514 because there were changes to ping pong test that were required.

[signorecello]

Hey the tests failed because it turns out we were really almost over the limit on gas. Add another 0 to the gas cost and they should run fine 😅

Done

[ChaitanyaKonda]

This is implemented fornightfall-client.
I'm assuming you planned implement this for wallet after wallet's merge into master?

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I can't find where to answer this comment, so i just put my answer here. My idea was to have @IlyasRidhuan do it as he knows how the wallet is structured. I wouldn't know where to start

[ChaitanyaKonda]

BREAKING CHANGE: Because registerProposer function signature changes