Solana subscriptions - #41
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Nice work there's a lot that went into this. Just a few suggestions
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WIP: work on getting solana logs using websockets <!-- ps-id: 2fa6abec-1050-4722-b43c-e77ce700ba16 -->
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chore: put solana stuff behind feature flag refactor: use async-stream <!-- ps-id: 7398871c-c74e-4612-93d0-a66961d12b08 -->
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Nice work. Awesome to see this land
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Adds the ability for apps to subscribe to logs from Solana programs. Due to a limitation of the solana rpc method
logsSubscribe, only a single program may be targeted per rpc request.To work around this, weopen a single websocket per void subscription, but are then able to subscribe to multiple solana programs over the single connection.
Features enabled by this work include:
query/solana_program_logs/tests.rs).query/solana_program_logs/tests.rs).oracle/tests/query_multi_chain.rs).Notes
logsSubscribe
The Solana PubsubClient.logs_subscribe() method returns (BoxStream<'a, T>, UnsubscribeFn)
where the stream borrows from the client with lifetime 'a. This means we cannot return
the stream from an async block that owns the client, as the borrow checker prevents
returning a value that references local data.
Unlike alloy's subscribe_logs() which returns an owned subscription that can be converted
into a stream with .into_stream(), Solana's API ties the stream lifetime to the client.
To work around this, we spawn a separate task that owns both the client and the stream,
and use a tokio mpsc channel to forward events to a ReceiverStream that we can safely return.
Multiple Program Subscription Architecture
When subscribing to multiple programs, this implementation:
This approach is efficient because:
Note: The Solana RpcTransactionLogsFilter::Mentions(vec![...]) uses AND semantics
(transaction must mention ALL addresses), so we need separate subscriptions to achieve
OR semantics (transaction mentioning ANY of our programs).
closes #28
closes #29
closes #30