CLI for Tips transactions

[amaury1093]

Part of the TX working group.

Summary

Think about the CLI UX for using meta-transactions.

Problem Definition

We added meta-transactions in #9406 and #9912. However, currently we only test them programmatically, e.g. using the SDK's TxBuilder.

We should think how end-users interact with meta-transactions.

Proposal (outdated, see comments below instead)

The SDK's user interface is the CLI, so this issue proposes to make changes to the current CLI.

Oudated proposal

1. Add --sign-mode=direct-aux flag
   • needs feat: Add SIGN_MODE_DIRECT_AUX and tx Tip proto definitions #9405
   • this flag requires --generate-only, because it's not possible to broadcast a AUX-signed tx
2. Add --sign-mode=amino-aux flag
   • needs Create SIGN_MODE_AMINO_AUX for signing meta-transactions #10249
   • this flag requires --generate-only, because it's not possible to broadcast a AUX-signed tx
3. Add a simd tx tips-to-fee <aux_signed_tx.json> sub-command
   • will read a {AMINO,DIRECT}_AUX-signed tx from a JSON file, create a fee-appended tx, and broadcast it.

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[amaury1093]

With the new AuxTxBuilder, any ideas on how to create a nice CLI UX for aux signers?

Currently I'm leaning towards:

Proposal : Add an --aux flag to all tx commands

Example:

simd tx bank send {...args} --aux --tip {some_tip}

This will print the AuxSignerData as JSON.

Pros:

• Small code changes

Cons:

• We put flags that can't overlap under the same command. If we have --aux, then --fees, --broadcast-mode, --generate-only etc don't make sense anymore. It can cause confusion, the help command should be updated.

Also: I kind of don't want to put aux stuff in the TxFactory. It would add too much if/elses in an already confusing code. IMO we just need a method

func (c client.Context) makeAuxSignerData() (AuxSignerData, error)

that takes a AuxTxBuilder and a keyring, and outputs a AuxSignerData that the CLI will print as JSON.