Multiple contract calls in a single transaction

[luizstacio]

if it's possible to write a script that can call multiple contract/contracts methods/calls on a single TX. Would be amazing if the SDK provide a simple API to build these actions in a bundle TX.

Use case

On swayswap to create liquidity between two pairs, you need to follow steps 1, 2, and 3 in sequence. This executes 3 transactions but would be nicer to build all 3 method calls, combine and send in a single TX.

1. Deposit coin A
2. Deposit coin B
3. Create liquidity

[AlicanC]

Update:

I finally got Multicall script to work today, but a lot needs to happen before we can merge it:

• It currently works with Forc@master. Forc with the features we need must be stable.
• The @fuel-ts/contract API still only supports single calls. (@camsjams' feat!: Refactor Contract API namespaces #303 has prepareCall that will be useful for this.)
• The script works with the heap so it needs std::alloc and std::ptr: Add std::alloc and std::ptr sway#1627
• The script uses generics so it needs this fixed: First use of a generic method fixes its generic type sway#1628 (PR: Monomorphize method applications sway#1671)

Some good-to-haves would be:

• Proposal to add equivalent of the Vec type sway#1077 (PR: stdlib Vec sway#1118)
• Implement mut arguments sway#1188
• Fix std::tx::tx_script_length() script padding issue sway#1585