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[HRMP] Dont partially modify pages #4710

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merged 5 commits into from
Jun 21, 2024
Merged

[HRMP] Dont partially modify pages #4710

merged 5 commits into from
Jun 21, 2024

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ggwpez
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@ggwpez ggwpez commented Jun 5, 2024

Changes:

  • The XCMP queue does not partially modify pages anymore by using try_mutate instead of mutate.
  • The XCMP queue max page size is now the min between the value that the relay reports and the local limit.

Thanks to whom pointed this out to me via DM.

@ggwpez ggwpez changed the title [HRMP] Dont write partial fragments to page [HRMP] Dont partially modify pages Jun 5, 2024
Signed-off-by: Oliver Tale-Yazdi <[email protected]>
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The CI pipeline was cancelled due to failure one of the required jobs.
Job name: cargo-clippy
Logs: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/6406660

Signed-off-by: Oliver Tale-Yazdi <[email protected]>
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nice!

Signed-off-by: Oliver Tale-Yazdi <[email protected]>
@ggwpez ggwpez added the T6-XCM This PR/Issue is related to XCM. label Jun 5, 2024
@@ -491,7 +491,7 @@ impl<T: Config> Pallet<T> {
let channel_info =
T::ChannelInfo::get_channel_info(recipient).ok_or(MessageSendError::NoChannel)?;
// Max message size refers to aggregates, or pages. Not to individual fragments.
let max_message_size = channel_info.max_message_size as usize;
let max_message_size = channel_info.max_message_size.min(T::MaxPageSize::get()) as usize;
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Suggested change
let max_message_size = channel_info.max_message_size.min(T::MaxPageSize::get()) as usize;
let max_message_size = channel_info.max_message_size.min.saturating_add(XcmpMessageFormat::max_encoded_len())(T::MaxPageSize::get()) as usize;

The XcmpMessageFormat is part of the page. So, if we don't do this, we will never be able to storage a message of max_message_size (when this is smaller than T::MaxPageSize).

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Yes, but i think this is a hard limit from the relay chain that we cannot go over. So the "max message size" is for a HRMP message - not for the XCM inside of it.

@ggwpez ggwpez enabled auto-merge June 21, 2024 14:05
@ggwpez ggwpez added this pull request to the merge queue Jun 21, 2024
Merged via the queue into master with commit d18d362 Jun 21, 2024
152 of 158 checks passed
@ggwpez ggwpez deleted the oty-xcmp-queue-page branch June 21, 2024 15:11
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5 participants