Clarification on SetFeePayer vs SetFeeGranter

[rootulp]

Context

cosmos-sdk/client/tx_config.go

Lines 48 to 51 in bd04173

	SetFeePayer(feePayer sdk.AccAddress)
	SetGasLimit(limit uint64)
	SetTimeoutHeight(height uint64)
	SetFeeGranter(feeGranter sdk.AccAddress)

Problem

In a test file I'd like to construct a transaction that uses the feegrant module. I want account B to pay the fee for a transaction submitted by account A. I'm using TxBuilder but I'm not sure if I should invoke SetFeePayer or SetFeeGranter.

Proposal

It would help me if this interface contained a Godoc that explained which one should be invoked for my use case.

[rootulp]

My test was failing because I was invoking SetFeePayer but appears to work how I would expect with SetFeeGranter. Since the naming here is confusing, I think docs would help.

Ref: celestiaorg/celestia-app@918c33d

[tac0turtle]

hey we are rewriting the client package. ill update this issue when we have the information