Add tx decode/encode subcommands

[leighmcculloch]

What

Add tx decode and encode subcommands.

Why

To make decoding tx's to JSON more discoverable and convenient. It's the most common XDR to want to decode.

Including encode for symmetry.

Dependent on:

• https://github.com/stellar/rs-stellar-xdr/pull/403

[willemneal]

I just had this same idea. This could be very useful for the tx edit functionality. E.g.

{
    "tx": {
      "tx": {
        "source_account":  "alice",
        "fee": 5000,
        "seq_num": 61499636711945,
        "cond": {
          "time": {
            "min_time": 0,
            "max_time": 1733772281
          }
        },
        "memo": {
          "text": "Load lumens"
        },
        "operations": [
          {
            "source_account": null,
            "body": {
              "payment": {
                "destination": "bob",
                "asset": "native", // could also handle `usdc:cicle` here
                "amount": 50000000
              }
            }
          }
        ],
        "ext": "v0"
      },
      "signatures": [
        {
          "hint": "26f802ad",
          "signature": "b26cde9fc068173241013279207343d17124488de0d44e43858faab093aca30efee4dbbce8a9fd96b11b7e36bd21db355c77fbe9bc2c493545b1bf19e31f5109"
        }
      ]
    }
  }

Perhaps we could add a tx update, which would then resolve all of the accounts and also maybe update the seq_num and fees?

[leighmcculloch]

Perhaps we could add a tx update, which would then resolve all of the accounts and also maybe update the seq_num and fees?

+1. Replying to this over here:

• https://github.com/stellar/stellar-cli/issues/1643#issuecomment-2533725947