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Allow integrated relay chain light client #2270

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merged 57 commits into from
Aug 22, 2023
Merged

Allow integrated relay chain light client #2270

merged 57 commits into from
Aug 22, 2023

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skunert
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@skunert skunert commented Mar 3, 2023

In this PR, I added a command line flag --relay-chain-rpc-client to enable experimental support for an embedded light client.

This leaves us with three execution modes for the relay chain:

  1. Embedded polkadot full node
  2. External polkadot node (using embedded mini-node for collation and pov-recovery)
  3. Embedded light-client (using embedded mini-node for collation and pov-recovery)

Implementation Overview

  • I reused the existing RPC infrastructure as much as possible. Only the worker is switched out
  • The light client is run in-process and gets the chain spec that is passed via relay chain args to the collator
  • We communicate with the help of the jsonrpsee library and let it handle subscription and request management
  • The example light-client implementation in the smoldot repo uses an implementation of the platform trait based on async-std. Since we use tokio here, I converted the implementation 1:1 using tokio structures.

Remaining issues

This issue is impacting us, I will take a look at what needs to be done on the substrate side:

@skunert skunert added A0-please_review Pull request needs code review. B1-note_worthy Changes should be noted in the release notes D3-trivial 🧸 PR contains trivial changes in a runtime directory that do not require an audit labels Mar 3, 2023
@skunert skunert requested a review from a team March 3, 2023 11:55
@skunert skunert added the C1-low PR touches the given topic and has a low impact on builders. label Mar 3, 2023
dmitry-markin
dmitry-markin approved these changes Mar 3, 2023
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LGTM as far as I understood the underlying logic from the code of PR.

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@dmitry-markin dmitry-markin requested a review from a team March 3, 2023 16:07
davxy
davxy approved these changes Jun 21, 2023
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davxy commented Jun 21, 2023

LGTM mostly nitpicks

@skunert skunert merged commit 5299ada into paritytech:master Aug 22, 2023
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A0-please_review Pull request needs code review. B1-note_worthy Changes should be noted in the release notes C1-low PR touches the given topic and has a low impact on builders. D3-trivial 🧸 PR contains trivial changes in a runtime directory that do not require an audit T0-node This PR/Issue is related to the topic “node”.
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