Andreas Fackler

### Problem The admin chain subscriptions for committee changes don't scale well: Every new chain sends a cross-chain message to the admin chain to subscribe to notifications about new committees,...

Put operation results in executed block

6

`execute_operation` (might get renamed: https://github.com/linera-io/linera-protocol/issues/3375) returns a result which is only used in cross-application calls, but dropped in operations. Let's store the results as a separate `Vec` (length `== operations.len()`)...

Separate block execution from outbox updates.

11

In the future we don't want to execute all blocks. So in the chain state and worker implementations, there should be two separate phases: * Verify the signatures. If there...

Limit number of pending blobs.

7

In permissionless chains, anyone can upload proposals and supply pending blobs. We should limit the number of `PendingBlobsView`s per chain. Re-proposals of validated blocks should be preferred. And we need...

Leave out the execution step in sender chains.

1

When downloading sender chains, omit the execution step. Only verify and update the outboxes.

When trying validators in random order, take weights into account.

3

If a validator has five times less weight its misbehavior should do five times less harm. So whenever we try to obtain something sequentially from the different validators, in order,...

[Unlike the server](https://github.com/linera-io/linera-protocol/blob/a3cce00ffedd93b89323c0a7c24a9b07b2ba09c8/linera-rpc/src/grpc/server.rs#L569), the proxy [doesn't convert errors to `NodeError`](https://github.com/linera-io/linera-protocol/blob/5fcbc190be2b0e4f796590ec4cdd6082b9bd1aac/linera-service/src/proxy/grpc.rs#L436). So they become a gRPC error, on which the client automatically retries. Retrying is not appropriate for many error cases,...

## Motivation With #3784, pub-sub channels are no longer needed. ## Proposal Remove them, and the types `ChannelName`, `Origin`, `Target`, `Medium`, `Destination`, etc. ## Test Plan CI ## Release Plan...

Implement `process_streams` for EVM.

1

#3784 introduces `process_streams`, which is called in Wasm contracts whenever streams they subscribe to have new events. We should do the same for EVM contracts, and also expose `subscribe_to_events` and...

Implement event stream subscriptions; port social example.

1

## Motivation We want to replace pub-sub channels with event streams for better scalability (https://github.com/linera-io/linera-protocol/issues/365). Events can already be emitted and read; this PR adds subscriptions. ## Proposal Handle the...