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Added fallback_max_weight to Transact for sending messages to V4 chains #6643

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@franciscoaguirre franciscoaguirre commented Nov 26, 2024

Closes: #6585

Removing the require_weight_at_most parameter in V5 Transact had only one problem. Converting a message from V5 to V4 to send to chains that didn't upgrade yet. The conversion would not know what weight to give to the Transact, since V4 and below require it.

To fix this, I added back the weight in the form of an Option<Weight> called fallback_max_weight. This can be set to None if you don't intend to deal with a chain that hasn't upgraded yet. If you set it to Some(_), the behaviour is the same. The plan is to totally remove this in V6 since there will be a good conversion path from V6 to V5.

@franciscoaguirre franciscoaguirre added the T6-XCM This PR/Issue is related to XCM. label Nov 26, 2024
@franciscoaguirre franciscoaguirre self-assigned this Nov 26, 2024
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/cmd fmt

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Command "fmt" has started 🚀 See logs here

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Command "fmt" has finished ✅ See logs here

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/cmd prdoc --audience runtime_dev --bump major

@franciscoaguirre franciscoaguirre marked this pull request as ready for review November 26, 2024 17:49
@franciscoaguirre franciscoaguirre requested a review from a team as a code owner November 26, 2024 17:49
@paritytech-review-bot paritytech-review-bot bot requested a review from a team November 26, 2024 17:50
@bkontur bkontur added the A4-needs-backport Pull request must be backported to all maintained releases. label Nov 27, 2024
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See comments. Please also add an explicit Transact test from V5 chain -> V4 chain.

polkadot/runtime/westend/src/impls.rs Outdated Show resolved Hide resolved
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@paritytech-review-bot paritytech-review-bot bot requested a review from a team November 29, 2024 17:43
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/cmd fmt

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Command "fmt" has started 🚀 See logs here

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Command "fmt" has finished ✅ See logs here

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/cmd fmt

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Command "fmt" has started 🚀 See logs here

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Command "fmt" has finished ✅ See logs here

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All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/12091781194
Failed job name: cargo-clippy

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[xcm] Transact v4 vs v5 compatibility
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