Commit Graph

2790 Commits

Author SHA1 Message Date
realbigsean
c7ddf1f0b1
add processing and processed caching to the DA checker (#4732)
* add processing and processed caching to the DA checker

* move processing cache out of critical cache

* get it compiling

* fix lints

* add docs to `AvailabilityView`

* some self review

* fix lints

* fix beacon chain tests

* cargo fmt

* make availability view easier to implement, start on testing

* move child component cache and finish test

* cargo fix

* cargo fix

* cargo fix

* fmt and lint

* make blob commitments not optional, rename some caches, add missing blobs struct

* Update beacon_node/beacon_chain/src/data_availability_checker/processing_cache.rs

Co-authored-by: ethDreamer <37123614+ethDreamer@users.noreply.github.com>

* marks review feedback and other general cleanup

* cargo fix

* improve availability view docs

* some renames

* some renames and docs

* fix should delay lookup logic

* get rid of some wrapper methods

* fix up single lookup changes

* add a couple docs

* add single blob merge method and improve process_... docs

* update some names

* lints

* fix merge

* remove blob indices from lookup creation log

* remove blob indices from lookup creation log

* delayed lookup logging improvement

* check fork choice before doing any blob processing

* remove unused dep

* Update beacon_node/beacon_chain/src/data_availability_checker/availability_view.rs

Co-authored-by: Michael Sproul <micsproul@gmail.com>

* Update beacon_node/beacon_chain/src/data_availability_checker/availability_view.rs

Co-authored-by: Michael Sproul <micsproul@gmail.com>

* Update beacon_node/beacon_chain/src/data_availability_checker/availability_view.rs

Co-authored-by: Michael Sproul <micsproul@gmail.com>

* Update beacon_node/beacon_chain/src/data_availability_checker/availability_view.rs

Co-authored-by: Michael Sproul <micsproul@gmail.com>

* Update beacon_node/network/src/sync/block_lookups/delayed_lookup.rs

Co-authored-by: Michael Sproul <micsproul@gmail.com>

* remove duplicate deps

* use gen range in random blobs geneartor

* rename processing cache fields

* require block root in rpc block construction and check block root consistency

* send peers as vec in single message

* spawn delayed lookup service from network beacon processor

* fix tests

---------

Co-authored-by: ethDreamer <37123614+ethDreamer@users.noreply.github.com>
Co-authored-by: Michael Sproul <micsproul@gmail.com>
2023-10-03 09:59:33 -04:00
realbigsean
67aeb6bf6b
insert cached child at the front of a chain of parent lookups (#4780)
* insert cached child at the front of a chain of parent lookups

* use vecdeque in parent lookup chain of blocks
2023-09-29 12:55:12 -04:00
realbigsean
9f37d6df77
reduce blob prune logging in forward sync (#4779) 2023-09-26 08:22:26 -04:00
Jimmy Chen
8f07a96b88
Fix failing tests. 2023-09-26 12:39:58 +10:00
Jimmy Chen
1458394cd9
Fix compilation issues after merging unstable. 2023-09-26 11:46:20 +10:00
Jimmy Chen
7a3cb135d4
Fix tests and add BlockContents decoding. Remove unused builder_threshold field in ApiTesterConfig. 2023-09-26 10:57:21 +10:00
Jimmy Chen
c0b6b92f27
Merge unstable 20230925 into deneb-free-blobs. 2023-09-26 10:32:18 +10:00
Michael Sproul
9244f7f7bc
Improvements to Deneb store upon review (#4693)
* Start testing blob pruning

* Get rid of unnecessary orphaned blob column

* Make random blob tests deterministic

* Test for pruning being blocked by finality

* Fix bugs and test fork boundary

* A few more tweaks to pruning conditions

* Tweak oldest_blob_slot semantics

* Test margin pruning

* Clean up some terminology and lints

* Schema migrations for v18

* Remove FIXME

* Prune blobs on finalization not every slot

* Fix more bugs + tests

* Address review comments
2023-09-25 14:21:54 -04:00
Paul Hauner
441fc1691b Release v4.5.0 (#4768)
## Issue Addressed

NA

## Proposed Changes

Bump versions from v4.4.1 to v4.5.0.

## Additional Info

NA
2023-09-25 05:14:01 +00:00
Lion - dapplion
5c5afafc0d
Update Deneb to 1.4.0-beta.2 (devnet-9) (#4735)
* Add MAX_PER_EPOCH_ACTIVATION_CHURN_LIMIT

* Update tests to 1.4.0-beta.2

* Implement equivocation check for proposer boost

* Use hotfix tests and fix minimal config

* Start updating fork choice tests for Deneb

* Finish implementing fork choice blob handling

---------

Co-authored-by: Michael Sproul <michael@sigmaprime.io>
2023-09-25 15:05:31 +10:00
João Oliveira
0f05499e30 Fix cli options (#4772)
## Issue Addressed

Fixes breaking change introduced on https://github.com/sigp/lighthouse/pull/4674/  that doesn't allow multiple `http_enabled` `ArgGroup` flags
2023-09-22 12:00:51 +00:00
João Oliveira
dcd69dfc62 Move dependencies to workspace (#4650)
## Issue Addressed

Synchronize dependencies and edition on the workspace `Cargo.toml`

## Proposed Changes

with https://github.com/rust-lang/cargo/issues/8415 merged it's now possible to synchronize details on the workspace `Cargo.toml` like the metadata and dependencies.
By only having dependencies that are shared between multiple crates aligned on the workspace `Cargo.toml` it's easier to not miss duplicate versions of the same dependency and therefore ease on the compile times.

## Additional Info
this PR also removes the no longer required direct dependency of the `serde_derive` crate.

should be reviewed after https://github.com/sigp/lighthouse/pull/4639 get's merged.
closes https://github.com/sigp/lighthouse/issues/4651


Co-authored-by: Michael Sproul <michael@sigmaprime.io>
Co-authored-by: Michael Sproul <micsproul@gmail.com>
2023-09-22 04:30:56 +00:00
João Oliveira
c5588eb66e require http and metrics for respective flags (#4674)
## Issue Addressed

following discussion on https://github.com/sigp/lighthouse/pull/4639#discussion_r1305183750 this PR makes the `http` and `metrics` sub-flags to require those main flags enabled
2023-09-22 02:33:10 +00:00
Michael Sproul
0074a3b5f5 Fix block & state queries prior to genesis (#4761)
## Issue Addressed

Closes #4751

## Proposed Changes

Prevent `state_root_at_slot` and `block_root_at_slot` from erroring out due to a call to `self.slot()?` that fails before genesis. This fixes pre-genesis queries for:

- block at slot 0
- block by genesis block root
- state at slot 0
- state by genesis state root
- state at `finalized` tag
- state at `justified` tag
2023-09-21 06:38:33 +00:00
Eitan Seri-Levi
992b476eac Add SSZ support to validator block production endpoints (#4534)
## Issue Addressed

#4531 

## Proposed Changes

add SSZ support to the following block production endpoints:

GET /eth/v2/validator/blocks/{slot}
GET /eth/v1/validator/blinded_blocks/{slot}

## Additional Info

i updated a few existing tests to use ssz instead of writing completely new tests
2023-09-21 06:38:31 +00:00
Jimmy Chen
a0478da990 Fix genesis state download panic when running in debug mode (#4753)
## Issue Addressed

#4738 

## Proposed Changes

See the above issue for details. Went with option #2 to use the async reqwest client in `Eth2NetworkConfig` and propagate the async-ness.
2023-09-21 04:17:25 +00:00
Michael Sproul
5a35278aea Add more checks and logging before genesis (#4730)
## Proposed Changes

This PR adds more logging prior to genesis, particularly on networks that start with execution enabled.

There are new checks using `eth_getBlockByHash/Number` to verify that the genesis state's `latest_execution_payload_header` matches the execution node's genesis block.

The first commit also runs the merge-readiness/Capella-readiness checks prior to genesis. This has two effects:

- Give more information on the execution node's status and its readiness for genesis.
- Prevent the `el_offline` status from being set on `/eth/v1/node/syncing`, which previously caused the VC to complain loudly.

I would like to include this for the Holesky reboot. It would have caught the misconfig that doomed the first Holesky.

## Additional Info

- Geth doesn't serve payload bodies prior to genesis, which is why we use the legacy methods. I haven't checked with other ELs yet.
- Currently this is logging errors with _Capella_ genesis states generated by `ethereum-genesis-generator` because the `withdrawals_root` is not set correctly (it is 0x0). This is not a blocker for Holesky, as it starts from Bellatrix (Pari is investigating).
2023-09-21 00:26:53 +00:00
Jimmy Chen
1e9925435e Reuse fork choice read lock instead of re-acquiring it immediately (#4688)
## Issue Addressed

I went through the code base and look for places where we acquire fork choice locks (after the deadlock bug was found and fixed in #4687), and discovered an instance where we re-acquire a lock immediately after dropping it. This shouldn't cause deadlock like the other issue, but is slightly less efficient.
2023-09-21 00:26:52 +00:00
Michael Sproul
4b6cb3db2c Prevent port re-use in HTTP API tests (#4745)
## Issue Addressed

CI is plagued by `AddrAlreadyInUse` failures, which are caused by race conditions in allocating free ports.

This PR removes all usages of the `unused_port` crate for Lighthouse's HTTP API, in favour of passing `:0` as the listen address. As a result, the listen address isn't known ahead of time and must be read from the listening socket after it binds. This requires tying some self-referential knots, which is a little disruptive, but hopefully doesn't clash too much with Deneb 🤞

There are still a few usages of `unused_tcp4_port` left in cases where we start external processes, like the `watch` Postgres DB, Anvil, Geth, Nethermind, etc. Removing these usages is non-trivial because it's hard to read the port back from an external process after starting it with `--port 0`. We might be able to do something on Linux where we read from `/proc/`, but I'll leave that for future work.
2023-09-20 01:19:03 +00:00
realbigsean
5f98a7b8ad
Deneb PR feedback updates (#4716)
* move length update outside of if let in LRU cache

* add comment and use hex for G1_POINT_AT_INFINITY

* remove some misleading comments from `ssz_snappy`

* make sure we can't overflow on blobs by range requests with large counts

* downgrade gossip verification internal availability check error

* change blob rpc responses from BlockingFnWithManualSendOnIdle to BlockingFn

* remove unnecessary collect in blobs by range response

* add a comment to blobs by range response start slot logic

* typo persist_data_availabilty_checker -> persist_data_availability_checker

* unify cheap_state_advance_to_obtain_committees
2023-09-15 15:05:48 +10:00
Age Manning
e4ed317b76 Add Experimental QUIC support (#4577)
## Issue Addressed

#4402 

## Proposed Changes

This PR adds QUIC support to Lighthouse. As this is not officially spec'd this will only work between lighthouse <-> lighthouse connections. We attempt a QUIC connection (if the node advertises it) and if it fails we fallback to TCP. 

This should be a backwards compatible modification. We want to test this functionality on live networks to observe any improvements in bandwidth/latency.

NOTE: This also removes the websockets transport as I believe no one is really using it. It should be mentioned in our release however.


Co-authored-by: João Oliveira <hello@jxs.pt>
2023-09-15 03:07:24 +00:00
Pawan Dhananjay
2cfcb51207
Blob references in ckzg (#4723)
* Move to using references in ckzg functions

* cleanup TrustedSetup a bit

* Remove BYTES_PER_FIELD_ELEMENT from KzgPreset
2023-09-14 12:14:30 +10:00
Stefan
4a31e369bf
increase the max topic subscriptions #4581 (#4588)
* increase the max topic subscriptions #4581

* make the max_subscription limitation based off constants / configuration

* format

* wording & add deneb topic array

* reduce max_subscriptions_per_request to 2x

* format

* update comment
2023-09-13 17:06:33 +10:00
realbigsean
8e7b57a794
Merge pull request #4719 from jimmygchen/deneb-merge-from-unstable-20230911
Deneb merge from unstable 20230911
2023-09-12 17:41:42 -04:00
realbigsean
58cd50681c
fix the missing components response code for block publish (#4721) 2023-09-11 09:54:14 -04:00
Jack McPherson
35f47f454f Await listening address from libp2p in RPC tests setup (#4705)
## Issue Addressed

#4704 

## Proposed Changes

 - Receive multiaddr from libp2p by awaiting listener setup

## Additional Info

See also: #4675
2023-09-11 06:14:56 +00:00
Jimmy Chen
d4aedab21f
Fix some compilation errors in tests 2023-09-11 14:07:08 +10:00
Jimmy Chen
6771954c5f
Merge unstable 20230911 into deneb-free-blobs. 2023-09-11 12:09:58 +10:00
Jimmy Chen
1db739490e
Update BlindedBlobsBundle SSZ list max length and update builder tests (#4710)
* Update mev-rs and ethereum-consensus

* Fix mock buidler open bid to return fork versioned response

* Update `mev-rs` and `ethereum-consensus`

* Remove BuilderKzgCommitments and use BlockBodyKzgCommitments everywhere.

* Update testnet scripts to support builder testing and update README.md.

* Add comment on `mev-rs` version.

* Add `BN_ARGS` config to `./scripts/tests/vars.env`

* Update builder testing command in README.md

* Reject zero block hash payloads after Bellatrix.

* Update scripts/local_testnet/README.md

Co-authored-by: realbigsean <seananderson33@GMAIL.com>

---------

Co-authored-by: realbigsean <seananderson33@GMAIL.com>
2023-09-09 16:10:15 +10:00
Jimmy Chen
50bf40b4bc
Update GET config/spec endpoint to support Deneb config (#4708)
* Update `GET config/spec` endpoint to support Deneb config.

* Update config spec `http_api` test
2023-09-09 16:09:50 +10:00
Michael Sproul
8db44decb7
Fix parent_beacon_block_root during proposer prep (#4703)
* Fix `parent_beacon_block_root` during prep/reorg

* Fix another bug and add tests

* Remove overzealous payload attributes check
2023-09-07 15:43:23 +10:00
Jimmy Chen
f9bea3c174
Deneb review common/eth2 (#4698)
* Update comments and small cleanup.

* Deserialize into `SsePayloadAttributesV3` for Deneb fork. Update `SignedBlockContents::blobs_cloned` to return blobs for `BlindedBlockAndBlobSidecars`.

* Improve code readability and error handling when converting blinded block into full block.
2023-09-06 14:39:25 +10:00
Michael Sproul
13606533b5
Simplifications for ./crypto (#4677) 2023-09-05 17:22:43 -04:00
Paul Hauner
2550170337
Deneb review suggestions (3) (#4694)
* Fix typos

* Avoid consuming/cloning blob

* Tidy comments
2023-09-05 15:50:57 -04:00
Paul Hauner
e783a40e01
Deneb review suggestions (#4678)
* Increase resolution for single lookup delay

* Remove code duplication

* Remove trusted setup code duplication
2023-09-05 15:49:11 -04:00
Michael Sproul
2841f60686 Release v4.4.1 (#4690)
## Proposed Changes

New release to replace the cancelled v4.4.0 release.

This release includes the bugfix #4687 which avoids a deadlock that was present in v4.4.0.

## Additional Info

Awaiting testing over the weekend this will be merged Monday September 4th.
2023-09-04 02:56:52 +00:00
Michael Sproul
74eb267643 Remove double-locking deadlock from HTTP API (#4687)
## Issue Addressed

Fix a deadlock introduced in #4236 which was caught during the v4.4.0 release testing cycle (with thanks to @paulhauner and `gdb`).

## Proposed Changes

Avoid re-locking the fork choice read lock when querying a state by root in the HTTP API. This avoids a deadlock due to the lock already being held.

## Additional Info

The [RwLock docs](https://docs.rs/lock_api/latest/lock_api/struct.RwLock.html#method.read) explicitly advise against re-locking:

> Note that attempts to recursively acquire a read lock on a RwLock when the current thread already holds one may result in a deadlock.
2023-08-31 11:18:00 +00:00
Paul Hauner
e99ba3a14e Release v4.4.0 (#4673)
## Issue Addressed

NA

## Proposed Changes

Bump versions from `v4.3.0` to `v4.4.0`.

## Additional Info

NA
2023-08-31 02:12:35 +00:00
Michael Sproul
f284e0e264 Fix bug in block root storage (#4663)
## Issue Addressed

Fix a bug in the storage of the linear block roots array in the freezer DB. Previously this array was always written as part of state storage (or block backfill). With state pruning enabled by #4610, these states were no longer being written and as a result neither were the block roots.

The impact is quite low, we would just log an error when trying to forwards-iterate the block roots, which for validating nodes only happens when they try to look up blocks for peers:

> Aug 25 03:42:36.980 ERRO Missing chunk in forwards iterator      chunk index: 49726, service: freezer_db

Any node checkpoint synced off `unstable` is affected and has a corrupt database. If you see the log above, you need to re-sync with the fix. Nodes that haven't checkpoint synced recently should _not_ be corrupted, even if they ran the buggy version.

## Proposed Changes

- Use a `ChunkWriter` to write the block roots when states are not being stored.
- Tweak the usage of `get_latest_restore_point` so that it doesn't return a nonsense value when state pruning is enabled.
- Tweak the guarantee on the block roots array so that block roots are assumed available up to the split slot (exclusive). This is a bit nicer than relying on anything to do with the latest restore point, which is a nonsensical concept when there aren't any restore points.

## Additional Info

I'm looking forward to deleting the chunked vector code for good when we merge tree-states 😁
2023-08-28 05:34:28 +00:00
Paul Hauner
d61f507184 Add Holesky (#4653)
## Issue Addressed

NA

## Proposed Changes

Add the Holesky network config as per 36e4ff2d51/custom_config_data.

Since the genesis state is ~190MB, I've opted to *not* include it in the binary and instead download it at runtime (see #4564 for context). To download this file we have:

- A hard-coded URL for a SigP-hosted S3 bucket with the Holesky genesis state. Assuming this download works correctly, users will be none the wiser that the state wasn't included in the binary (apart from some additional logs)
- If the user provides a `--checkpoint-sync-url` flag, then LH will download the genesis state from that server rather than our S3 bucket.
- If the user provides a `--genesis-state-url` flag, then LH will download the genesis state from that server regardless of the S3 bucket or `--checkpoint-sync-url` flag.
- Whenever a genesis state is downloaded it is checked against a checksum baked into the binary.
- A genesis state will never be downloaded if it's already included in the binary.
- There is a `--genesis-state-url-timeout` flag to tweak the timeout for downloading the genesis state file.

## Log Output

Example of log output when a state is downloaded:

```bash
Aug 23 05:40:13.424 INFO Logging to file                         path: "/Users/paul/.lighthouse/holesky/beacon/logs/beacon.log"
Aug 23 05:40:13.425 INFO Lighthouse started                      version: Lighthouse/v4.3.0-bd9931f+
Aug 23 05:40:13.425 INFO Configured for network                  name: holesky
Aug 23 05:40:13.426 INFO Data directory initialised              datadir: /Users/paul/.lighthouse/holesky
Aug 23 05:40:13.427 INFO Deposit contract                        address: 0x4242424242424242424242424242424242424242, deploy_block: 0
Aug 23 05:40:13.427 INFO Downloading genesis state               info: this may take some time on testnets with large validator counts, timeout: 60s, server: https://sigp-public-genesis-states.s3.ap-southeast-2.amazonaws.com/
Aug 23 05:40:29.895 INFO Starting from known genesis state       service: beacon
```

Example of log output when there are no URLs specified:

```
Aug 23 06:29:51.645 INFO Logging to file                         path: "/Users/paul/.lighthouse/goerli/beacon/logs/beacon.log"
Aug 23 06:29:51.646 INFO Lighthouse started                      version: Lighthouse/v4.3.0-666a39c+
Aug 23 06:29:51.646 INFO Configured for network                  name: goerli
Aug 23 06:29:51.647 INFO Data directory initialised              datadir: /Users/paul/.lighthouse/goerli
Aug 23 06:29:51.647 INFO Deposit contract                        address: 0xff50ed3d0ec03ac01d4c79aad74928bff48a7b2b, deploy_block: 4367322
The genesis state is not present in the binary and there are no known download URLs. Please use --checkpoint-sync-url or --genesis-state-url.
```

## Additional Info

I tested the `--genesis-state-url` flag with all 9 Goerli checkpoint sync servers on https://eth-clients.github.io/checkpoint-sync-endpoints/ and they all worked 🎉 

My IDE eagerly formatted some `Cargo.toml`. I've disabled it but I don't see the value in spending time reverting the changes that are already there.

I also added the `GenesisStateBytes` enum to avoid an unnecessary clone on the genesis state bytes baked into the binary. This is not a huge deal on Mainnet, but will become more relevant when testing with big genesis states.

When we do a fresh checkpoint sync we're downloading the genesis state to check the `genesis_validators_root` against the finalised state we receive. This is not *entirely* pointless, since we verify the checksum when we download the genesis state so we are actually guaranteeing that the finalised state is on the same network. There might be a smarter/less-download-y way to go about this, but I've run out of cycles to figure that out. Perhaps we can grab it in the next release?
2023-08-28 05:34:27 +00:00
Mac L
55e02e7c3f Show --gui flag in help text (#4660)
## Issue Addressed

N/A

## Proposed Changes

Remove the `hidden(true)` modifier on the `--gui` flag so it shows up when running `lighthouse bn --help`

## Additional Info

We need to include this now that Siren has had its first stable release.
2023-08-28 00:55:33 +00:00
Jimmy Chen
9c24cd4ad4 Do not log slot clock error prior to genesis (#4657)
## Issue Addressed

#4654 

## Proposed Changes

Only log error if we're unable to read slot clock after genesis. 

I thought about simply down grading the `error` to a `warn`, but feel like it's still unnecessary noise before genesis, and it would be good to retain error log if we're pass genesis. But I'd be ok with just downgrading the log level, too.
2023-08-28 00:55:32 +00:00
Michael Sproul
8e95b69a1a Send success code for duplicate blocks on HTTP (#4655)
## Issue Addressed

Closes #4473 (take 3)

## Proposed Changes

- Send a 202 status code by default for duplicate blocks, instead of 400. This conveys to the caller that the block was published, but makes no guarantees about its validity. Block relays can count this as a success or a failure as they wish.
- For users wanting finer-grained control over which status is returned for duplicates, a flag `--http-duplicate-block-status` can be used to adjust the behaviour. A 400 status can be supplied to restore the old (spec-compliant) behaviour, or a 200 status can be used to silence VCs that warn loudly for non-200 codes (e.g. Lighthouse prior to v4.4.0).
- Update the Lighthouse VC to gracefully handle success codes other than 200. The info message isn't the nicest thing to read, but it covers all bases and isn't a nasty `ERRO`/`CRIT` that will wake anyone up.

## Additional Info

I'm planning to raise a PR to `beacon-APIs` to specify that clients may return 202 for duplicate blocks. Really it would be nice to use some 2xx code that _isn't_ the same as the code for "published but invalid". I think unfortunately there aren't any suitable codes, and maybe the best fit is `409 CONFLICT`. Given that we need to fix this promptly for our release, I think using the 202 code temporarily with configuration strikes a nice compromise.
2023-08-28 00:55:31 +00:00
João Oliveira
c258270d6a update dependencies (#4639)
## Issue Addressed

updates underlying dependencies and removes the ignored `RUSTSEC`'s for `cargo audit`.

Also switches `procinfo` to `procfs` on `eth2` to remove the `nom` warning, `procinfo` is unmaintained see [here](https://github.com/danburkert/procinfo-rs/issues/46).
2023-08-28 00:55:28 +00:00
realbigsean
42b34dbbe4
cargo fmt 2023-08-24 14:35:06 -04:00
realbigsean
f90b190d9a
Merge branch 'unstable' of https://github.com/sigp/lighthouse into merge-unstable-deneb-aug-24 2023-08-24 14:34:32 -04:00
realbigsean
14924dbc95
rust 1.72 lints (#4659) 2023-08-24 14:33:24 -04:00
realbigsean
8ed77d4550
Merge branch 'unstable' of https://github.com/sigp/lighthouse into merge-unstable-deneb-aug-24 2023-08-24 10:54:43 -04:00
Pawan Dhananjay
ea43b6a53c Revive mplex (#4619)
## Issue Addressed

N/A

## Proposed Changes

In #4431 , we seem to have removed support for mplex as it is being deprecated in libp2p. See https://github.com/libp2p/specs/issues/553 . Related rust-libp2p PR https://github.com/libp2p/rust-libp2p/pull/3920
However, since this isn't part of the official [consensus specs](https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/p2p-interface.md#multiplexing), we still need to support mplex. 

> Clients MUST support [mplex](https://github.com/libp2p/specs/tree/master/mplex) and MAY support [yamux](https://github.com/hashicorp/yamux/blob/master/spec.md).

This PR adds back mplex support as before.
2023-08-24 05:54:37 +00:00
Eitan Seri-Levi
661779f08e Implement expected withdrawals endpoint (#4390)
## Issue Addressed

[#4029](https://github.com/sigp/lighthouse/issues/4029)

## Proposed Changes

implement expected_withdrawals HTTP API per the spec 

https://github.com/ethereum/beacon-APIs/pull/304

## Additional Info
2023-08-24 05:54:36 +00:00