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Implementer's guide: downward messages and HRMP #1399

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Implementer's guide: downward messages and HRMP #1399

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c90fdf4
First stab at downward messages.
pepyakin Jul 13, 2020
d1ab1fb
Add some structure to the router.
pepyakin Jul 13, 2020
69fe295
Update `ValidationOutputs`
pepyakin Jul 13, 2020
ceaa096
Add `processed_downward_messages` to `ValidationOutputs`.
pepyakin Jul 14, 2020
e952a01
s/AccountId/ParaId
pepyakin Jul 14, 2020
778cc2b
DownwardMessage::ParachainSpecfic
pepyakin Jul 14, 2020
bdb97af
s/ensure_horizontal_messages_fits/ensure_horizontal_messages_fit
pepyakin Jul 14, 2020
921ca3b
Clarify that Router called for each candidate
pepyakin Jul 14, 2020
3fff854
Update the preamble for Router.
pepyakin Jul 14, 2020
8072356
Rewrite the relay-chain extrinsic routines
pepyakin Jul 14, 2020
a622f77
Update gloassary
pepyakin Jul 14, 2020
0309bc5
Add DMP to the glossary
pepyakin Jul 14, 2020
1c75b51
If the queue is empty, `processed_downward_messages` can be 0
pepyakin Jul 14, 2020
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Update the preamble for Router.
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pepyakin committed Jul 14, 2020
commit 3fff854a4c18255f8fec84eb876327c79d6ed724
5 changes: 3 additions & 2 deletions roadmap/implementers-guide/src/runtime/router.md
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# Router Module

The Router module is responsible for storing and dispatching Upward and Downward messages from and to parachains respectively. It is intended to later handle the XCMP logic as well.
The Router module is responsible for all messaging mechanisms supported between paras and the relay chain, specifically: UMP, DMP, HRMP and later XCMP.
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@pepyakin pepyakin Jul 14, 2020

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I think it would be better to add a separate page for describing those in detail and linking this page here. As for now, I added those in the glossary.


For each enacted block the `queue_upward_messages` entry-point is called.
For checking the validity of message passing within a candidate the `ensure_processed_downward_messages` and `ensure_horizontal_messages_fit` routines are called.
When a candidate is enacted the `drain_downward_messages`, `queue_horizontal_messages` and `queue_upward_messages` are called.

## Storage

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