The `step` parameter has not seen much implementation in real life
clients which instead opt to request variations on a few epochs at a
time (instead of interleaving single blocks, entire epochs are
interleaved).
At the same time, supporting `step` on the server side brings several
complications: more complex bounds checking logic, more complex loading
of blocks from linear storage (which presumably stores all blocks and
not just certain increments).
This PR suggests that we deprecate the whole idea. Backwards
compatibility is kept by simply responding with a single block when
`step > 0` - this is allowed by the spec and should thus be handled
gracefully by requesting clients already, should there exist any that
use larger step counts.
Removing `step` now allows simplifying the EL-CL protocol for serving
execution data from the EL to avoid double storage.
When nodes are syncing but have not yet reached the canonical `head`,
they cannot determine whether nodes they are connected to serve a valid
history or are making bogus claims in their `Status` advertisement.
Thus, the best course of action that a client can take is to vote for
its "current" best synced head, regardless of whether it's connected to
peers that claim to have other heads or not.
However, in the p2p spec, we penalize such peers with a `REJECT` - this
should be an `IGNORE` instead because this vote is correct per the spec,
albeit "late" according to the validating clients' view of the chain.
The spec reserves the libp2p error code range `[3, 127]` for future use
but actually defines error code `3` as `ResourceUnavailable`. This patch
updates the reserved range to `[4, 127]`.
When a light client updates its `finalized_header` using a forced update
because of the timeout, and the new header was not signed by enough sync
committee participants to pass `get_safety_threshold(store)`, it may
occur that `store.finalized_header.slot > store.optimistic_header.slot`.
This patch ensures that the `optimistic_header` is updated to the latest
`finalized_header` if that happens, so that it always indicates the
latest known and accepted head.
There were a couple instances where a division was used on an epoch
to derive the corresponding sync committee period instead of calling the
`compute_sync_committee_period` function.
These instances were changed to also use the function.
Jacek Sieka
Jacek Sieka
Mikhail Kalinin
Danny Ryan
protolambda
Aditya Asgaonkar
Nishant Das
Hsiao-Wei Wang
Etan Kissling
Dustin Brody
Alex Stokes
Paul Hauner