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Refactor docs into mdbook (#547)

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47
Makefile
View File

@ -1,31 +1,30 @@
TESTS_TAG := v0.8.3
TESTS = general minimal mainnet
.PHONY: tests
TESTS_BASE_DIR := ./tests/ef_tests
REPO_NAME := eth2.0-spec-tests
OUTPUT_DIR := $(TESTS_BASE_DIR)/$(REPO_NAME)
BASE_URL := https://github.com/ethereum/$(REPO_NAME)/releases/download/$(SPEC_VERSION)
EF_TESTS = "tests/ef_tests"
# Builds the entire workspace in release (optimized).
#
# Binaries will most likely be found in `./target/release`
release:
cargo build --all --release
cargo build --release --all
clean_ef_tests:
rm -r $(OUTPUT_DIR)
# Runs the full workspace tests, without downloading any additional test
# vectors.
test:
cargo test --all --all-features --release
ef_tests: download_tests extract_tests
mkdir $(OUTPUT_DIR)
for test in $(TESTS); do \
tar -C $(OUTPUT_DIR) -xvf $(TESTS_BASE_DIR)/$$test.tar ;\
rm $(TESTS_BASE_DIR)/$$test.tar ;\
done
# Runs the entire test suite, downloading test vectors if required.
test-full: make-ef-tests test
extract_tests:
for test in $(TESTS); do \
gzip -df $(TESTS_BASE_DIR)/$$test.tar.gz ;\
done
# Runs the makefile in the `ef_tests` repo.
#
# May download and extract an archive of test vectors from the ethereum
# repositories. At the time of writing, this was several hundred MB of
# downloads which extracts into several GB of test vectors.
make-ef-tests:
make -C $(EF_TESTS)
download_tests:
for test in $(TESTS); do \
wget -P $(TESTS_BASE_DIR) $(BASE_URL)/$$test.tar.gz; \
done
# Performs a `cargo` clean and cleans the `ef_tests` directory.
clean:
cargo clean
make -C $(EF_TESTS) clean

172
README.md
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@ -2,172 +2,77 @@
An open-source Ethereum 2.0 client, written in Rust and maintained by Sigma Prime.
[![Build Status]][Build Link] [![Doc Status]][Doc Link] [![Chat Badge]][Chat Link]
[![Build Status]][Build Link] [![Book Status]][Book Link] [![RustDoc Status]][RustDoc Link] [![Chat Badge]][Chat Link] [![Swagger Badge]][Swagger Link]
[Build Status]: https://gitlab.sigmaprime.io/sigp/lighthouse/badges/master/build.svg
[Build Link]: https://gitlab.sigmaprime.io/sigp/lighthouse/pipelines
[Chat Badge]: https://img.shields.io/badge/chat-discord-%237289da
[Chat Link]: https://discord.gg/cyAszAh
[Doc Status]: https://img.shields.io/badge/docs-master-blue.svg
[Doc Link]: http://lighthouse-docs.sigmaprime.io/
[Book Status]:https://img.shields.io/badge/user--docs-master-informational
[Book Link]: http://lighthouse-book.sigmaprime.io/
[RustDoc Status]:https://img.shields.io/badge/code--docs-master-orange
[RustDoc Link]: http://lighthouse-docs.sigmaprime.io/
[Swagger Badge]: https://img.shields.io/badge/Open%20API-0.2.0-success
[Swagger Link]: https://app.swaggerhub.com/apis-docs/spble/lighthouse_rest_api/0.2.0
![terminalize](https://i.postimg.cc/Y0BQ0z3R/terminalize.gif)
## Overview
Lighthouse is:
- Fully open-source, licensed under Apache 2.0.
- Security-focused, fuzzing has begun and security reviews are planned
- Security-focused. Fuzzing has begun and security reviews are planned
for late-2019.
- Built in [Rust](https://www.rust-lang.org/), a modern language providing unique safety guarantees and
excellent performance (comparable to C++).
- Funded by various organisations, including Sigma Prime, the
Ethereum Foundation, ConsenSys and private individuals.
- Actively working to promote an inter-operable, multi-client Ethereum 2.0.
- Actively involved in the specification and security analysis of the emerging
Ethereum 2.0 specification.
Like all Ethereum 2.0 clients, Lighthouse is a work-in-progress.
## Development Status
Lighthouse, like all Ethereum 2.0 clients, is a work-in-progress. Instructions
are provided for running the client, however these instructions are designed
for developers and researchers working on the project. We do not (yet) provide
user-facing functionality.
Current development overview:
- Specification `v0.8.1` implemented, optimized and passing test vectors.
- Specification `v0.8.3` implemented, optimized and passing test vectors.
- Rust-native libp2p with Gossipsub and Discv5.
- RESTful JSON API via HTTP server.
- Events via WebSocket.
- Metrics via Prometheus.
- Basic gRPC API, soon to be replaced with RESTful HTTP/JSON.
### Roadmap
- **Early-September 2019**: `lighthouse-0.0.1` release: A stable testnet for
developers with a useful HTTP API.
- **September 2019**: Inter-operability with other Ethereum 2.0 clients.
- **October 2019**: Public, multi-client testnet with user-facing functionality.
- **January 2020**: Production Beacon Chain testnet.
- ~~**April 2019**: Inital single-client testnets.~~
- ~~**September 2019**: Inter-operability with other Ethereum 2.0 clients.~~
- **Early-October 2019**: `lighthouse-0.0.1` release: All major phase 0
features implemented.
- **Q4 2019**: Public, multi-client testnet with user-facing functionality.
- **Q4 2019**: Third-party security review.
- **Q1 2020**: Production Beacon Chain testnet (tentative).
## Usage
Lighthouse consists of multiple binaries:
## Documentation
- [`beacon_node/`](beacon_node/): produces and verifies blocks from the P2P
connected validators and the P2P network. Provides an API for external services to
interact with Ethereum 2.0.
- [`validator_client/`](validator_client/): connects to a `beacon_node` and
performs the role of a proof-of-stake validator.
- [`account_manager/`](account_manager/): a stand-alone component providing key
management and creation for validators.
The [Lighthouse Book](http://lighthouse-book.sigmaprime.io/) contains information
for testnet users and developers.
### Simple Local Testnet
**Note: these instructions are intended for developers and researchers. We do
not yet support end-users.**
In this example we use the `account_manager` to create some keys, launch two
`beacon_node` instances and connect a `validator_client` to one. The two
`beacon_nodes` should stay in sync and build a Beacon Chain.
First, clone this repository, [setup a development
environment](docs/env.md) and navigate to the root directory of this repository.
Then, run `$ cargo build --all --release` and navigate to the `target/release`
directory and follow the steps:
#### 1. Generate Validator Keys
Generate 16 validator keys and store them in `~/.lighthouse-validator`:
```
$ ./account_manager -d ~/.lighthouse-validator generate_deterministic -i 0 -n 16
```
_Note: these keys are for development only. The secret keys are
deterministically generated from low integers. Assume they are public
knowledge._
#### 2. Start a Beacon Node
This node will act as the boot node and provide an API for the
`validator_client`.
```
$ ./beacon_node --recent-genesis --rpc
```
_Note: `--recent-genesis` defines the genesis time as either the start of the
current hour, or half-way through the current hour (whichever is most recent).
This makes it very easy to create a testnet, but does not allow nodes to
connect if they were started in separate 30-minute windows._
#### 3. Start Another Beacon Node
In another terminal window, start another boot that will connect to the
running node.
The running node will display it's ENR as a base64 string. This ENR, by default, has a target address of `127.0.0.1` meaning that any new node will connect to this node via `127.0.0.1`. If a boot node should be connected to on a different address, it should be run with the `--discovery-address` CLI flag to specify how other nodes may connect to it.
```
$ ./beacon_node -r --boot-nodes <boot-node-ENR> --listen-address 127.0.0.1 --port 9001 --datadir /tmp/.lighthouse
```
Here <boot-node-ENR> is the ENR string displayed in the terminal from the first node. The ENR can also be obtained from it's default directory `.lighthouse/network/enr.dat`.
The `--datadir` flag tells this Beacon Node to store it's files in a different
directory. If you're on a system that doesn't have a `/tmp` dir (e.g., Mac,
Windows), substitute this with any directory that has write access.
Note that all future created nodes can use the same boot-node ENR. Once connected to the boot node, all nodes should discover and connect with each other.
#### 4. Start a Validator Client
In a third terminal window, start a validator client:
```
$ ./validator_client
```
You should be able to observe the validator signing blocks, the boot node
processing these blocks and publishing them to the other node. If you have
issues, try restarting the beacon nodes to ensure they have the same genesis
time. Alternatively, raise an issue and include your terminal output.
## Further Reading
- [About Lighthouse](docs/lighthouse.md): Goals, Ideology and Ethos surrounding
this implementation.
- [What is Ethereum Serenity](docs/serenity.md): an introduction to Ethereum Serenity.
- [Lighthouse Technical Documentation](http://lighthouse-docs.sigmaprime.io/): The Rust generated documentation, updated regularly.
Code documentation is generated via `cargo doc` and hosted at
[lighthouse-docs.sigmaprime.io](http://lighthouse-docs.sigmaprime.io/).
If you'd like some background on Sigma Prime, please see the [Lighthouse Update
\#00](https://lighthouse.sigmaprime.io/update-00.html) blog post or the
[company website](https://sigmaprime.io).
## Directory Structure
- [`beacon_node/`](beacon_node/): the "Beacon Node" binary and crates exclusively
associated with it.
- [`docs/`](docs/): documentation related to the repository. This includes contributor
guides, etc. (It does not include code documentation, which can be produced with `cargo doc`).
- [`eth2/`](eth2/): Crates containing common logic across the Lighthouse project. For
example: Ethereum 2.0 types ([`BeaconBlock`](eth2/types/src/beacon_block.rs), [`BeaconState`](eth2/types/src/beacon_state.rs), etc) and
SimpleSerialize (SSZ).
- [`protos/`](protos/): protobuf/gRPC definitions that are common across the Lighthouse project.
- [`validator_client/`](validator_client/): the "Validator Client" binary and crates exclusively
associated with it.
- [`tests/`](tests/): code specific to testing, most notably contains the
Ethereum Foundation test vectors.
\#00](https://lighthouse.sigmaprime.io/update-00.html) blog post or
[sigmaprime.io](https://sigmaprime.io).
## Contributing
**Lighthouse welcomes contributors.**
Lighthouse welcomes contributors.
If you are looking to contribute, please head to our
[onboarding documentation](https://github.com/sigp/lighthouse/blob/master/docs/onboarding.md).
If you'd like to contribute, try having a look through the [open
issues](https://github.com/sigp/lighthouse/issues) (tip: look for the [good
first
issue](https://github.com/sigp/lighthouse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
tag) and ping us on the [gitter](https://gitter.im/sigp/lighthouse) channel. We need
your support!
If you are looking to contribute, please head to the
[Contributing](http://lighthouse-book.sigmaprime.io/contributing.html) section
of the Lighthouse book.
## Contact
@ -175,8 +80,13 @@ The best place for discussion is the [Lighthouse Discord
server](https://discord.gg/cyAszAh). Alternatively, you may use the
[sigp/lighthouse gitter](https://gitter.im/sigp/lighthouse).
Encrypt sensitive messages using our [PGP
key](https://keybase.io/sigp/pgp_keys.asc?fingerprint=dcf37e025d6c9d42ea795b119e7c6cf9988604be).
## Donations
If you support the cause, we accept donations to help fund development:
Lighthouse is an open-source project and a public good. Funding public goods is
hard and we're grateful for the donations we receive from the community via:
`0x25c4a76E7d118705e7Ea2e9b7d8C59930d8aCD3b` (donation.sigmaprime.eth)
- [Gitcoin Grants](https://gitcoin.co/grants/25/lighthouse-ethereum-20-client).
- Ethereum address: `0x25c4a76E7d118705e7Ea2e9b7d8C59930d8aCD3b` (donation.sigmaprime.eth).

12
beacon_node/beacon_chain/src/beacon_chain.rs
View File

@ -10,7 +10,7 @@ use lmd_ghost::LmdGhost;
use operation_pool::DepositInsertStatus;
use operation_pool::{OperationPool, PersistedOperationPool};
use parking_lot::RwLock;
use slog::{error, info, trace, warn, Logger};
use slog::{debug, error, info, trace, warn, Logger};
use slot_clock::SlotClock;
use ssz::Encode;
use state_processing::per_block_processing::{
@ -646,8 +646,8 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
trace!(
self.log,
"Beacon attestation imported";
"shard" => attestation.data.crosslink.shard,
"target_epoch" => attestation.data.target.epoch,
"shard" => attestation.data.crosslink.shard,
);
let _ = self
.event_handler
@ -1397,12 +1397,16 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
info!(
self.log,
"New head beacon block";
"root" => format!("{}", beacon_block_root),
"slot" => new_slot,
);
debug!(
self.log,
"Head beacon block";
"justified_root" => format!("{}", beacon_state.current_justified_checkpoint.root),
"justified_epoch" => beacon_state.current_justified_checkpoint.epoch,
"finalized_root" => format!("{}", beacon_state.finalized_checkpoint.root),
"finalized_epoch" => beacon_state.finalized_checkpoint.epoch,
"root" => format!("{}", beacon_block_root),
"slot" => new_slot,
);
};

11
beacon_node/client/src/lib.rs
View File

@ -13,7 +13,7 @@ use exit_future::Signal;
use futures::{future::Future, Stream};
use network::Service as NetworkService;
use rest_api::NetworkInfo;
use slog::{crit, error, info, o};
use slog::{crit, debug, error, info, o};
use slot_clock::SlotClock;
use std::marker::PhantomData;
use std::sync::Arc;
@ -309,11 +309,16 @@ fn log_new_slot<T: BeaconChainTypes>(chain: &Arc<BeaconChain<T>>, log: &slog::Lo
info!(
log,
"Slot start";
"best_slot" => best_slot,
"slot" => current_slot,
);
debug!(
log,
"Slot info";
"skip_slots" => current_slot.saturating_sub(best_slot),
"best_block_root" => format!("{}", latest_block_root),
"best_block_slot" => best_slot,
"slot" => current_slot,
)
);
} else {
error!(
log,

0
docs/api_spec.yaml → beacon_node/rest_api/api_spec.yaml
View File

14
beacon_node/rpc/src/attestation.rs
View File

@ -103,8 +103,9 @@ impl<T: BeaconChainTypes> AttestationService for AttestationServiceInstance<T> {
// Attestation was successfully processed.
info!(
self.log,
"PublishAttestation";
"type" => "valid_attestation",
"Valid attestation from RPC";
"target_epoch" => attestation.data.target.epoch,
"shard" => attestation.data.crosslink.shard,
);
// valid attestation, propagate to the network
@ -123,8 +124,7 @@ impl<T: BeaconChainTypes> AttestationService for AttestationServiceInstance<T> {
.unwrap_or_else(|e| {
error!(
self.log,
"PublishAttestation";
"type" => "failed to publish attestation to gossipsub",
"Failed to gossip attestation";
"error" => format!("{:?}", e)
);
});
@ -135,8 +135,7 @@ impl<T: BeaconChainTypes> AttestationService for AttestationServiceInstance<T> {
// Attestation was invalid
warn!(
self.log,
"PublishAttestation";
"type" => "invalid_attestation",
"Invalid attestation from RPC";
"error" => format!("{:?}", e),
);
resp.set_success(false);
@ -146,8 +145,7 @@ impl<T: BeaconChainTypes> AttestationService for AttestationServiceInstance<T> {
// Some other error
warn!(
self.log,
"PublishAttestation";
"type" => "beacon_chain_error",
"Failed to process attestation from RPC";
"error" => format!("{:?}", e),
);
resp.set_success(false);

10
beacon_node/rpc/src/beacon_block.rs
View File

@ -105,8 +105,8 @@ impl<T: BeaconChainTypes> BeaconBlockService for BeaconBlockServiceInstance<T> {
info!(
self.log,
"Valid block from RPC";
"block_slot" => block.slot,
"block_root" => format!("{}", block_root),
"root" => format!("{}", block_root),
"slot" => block.slot,
);
// create the network topic to send on
@ -126,8 +126,7 @@ impl<T: BeaconChainTypes> BeaconBlockService for BeaconBlockServiceInstance<T> {
.unwrap_or_else(|e| {
error!(
self.log,
"PublishBeaconBlock";
"type" => "failed to publish to gossipsub",
"Failed to gossip beacon block";
"error" => format!("{:?}", e)
);
});
@ -151,8 +150,7 @@ impl<T: BeaconChainTypes> BeaconBlockService for BeaconBlockServiceInstance<T> {
// Some failure during processing.
error!(
self.log,
"PublishBeaconBlock";
"type" => "failed_to_process",
"Failed to process beacon block";
"error" => format!("{:?}", e)
);

17
book/README.md Normal file
View File

@ -0,0 +1,17 @@
# Lighthouse Book
Contains an [mdBook](https://github.com/rust-lang-nursery/mdBook) that serves
as the primary source of Lighthouse user documentation.
The book is hosted at [lighthouse-book.sigmaprime.io](http://lighthouse-book.sigmaprime.io).
## Usage
The [mdBook docs](https://github.com/rust-lang-nursery/mdBook#usage) are the
best source of information for building the book.
### Example
1. Install mdBook: `$ cargo install mdbook`
1. Build the book, open it in a browser and build after file changes: `$ mdbook
watch --open`

2
book/book.toml
View File

@ -3,4 +3,4 @@ authors = ["Paul Hauner"]
language = "en"
multilingual = false
src = "src"
title = "Lighthouse"
title = "Lighthouse Book"

17
book/src/SUMMARY.md
View File

@ -1,11 +1,12 @@
# Summary
* [Introduction](./intro.md)
* [Development Environment](./setup.md)
* [Websocket Interface](./websockets.md)
* [Simple Local Testnet](./simple-testnet.md)
* [Interop](./interop.md)
* [Environment](./interop-environment.md)
* [CLI Overview](./interop-cli.md)
* [Scenarios](./interop-scenarios.md)
* [Cheat-sheet](./interop-cheat-sheet.md)
* [CLI](./cli.md)
* [Testnets](./testnets.md)
* [Simple Local Testnet](./simple-testnet.md)
* [API](./api.md)
* [HTTP (RESTful JSON)](./http.md)
* [WebSocket](./websockets.md)
* [Contributing](./contributing.md)
* [Development Environment](./setup.md)
* [CI & Testing](./ci.md)

13
book/src/api.md Normal file
View File

@ -0,0 +1,13 @@
# APIs
The Lighthouse `beacon_node` provides two APIs for local consumption:
- A [RESTful JSON HTTP API](http.html) which provides beacon chain, node and network
information.
- A read-only [WebSocket API](websockets.html) providing beacon chain events, as they occur.
## Security
These endpoints are not designed to be exposed to the public Internet or
untrusted users. They may pose a considerable DoS attack vector when used improperly.

33
book/src/ci.md Normal file
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@ -0,0 +1,33 @@
# Contiguous Integration (CI) and Testing
Lighthouse uses a self-hosted Gitlab CI server to run tests and deploy docs.
For security reasons, **CI will only be run automatically for Lighthouse
maintainers.** Contributors without maintainer privileges will need to have CI
triggered for them prior to a PR being merged.
You can see the full set of tests we run in the
[gitlab-ci.yml](https://github.com/sigp/lighthouse/blob/master/.gitlab-ci.yml)
file. The following two commands should complete successfully before CI can
pass:
```bash
$ cargo test --all --all-features
$ cargo fmt --all --check
```
_Note: Travis CI is also used, however it does not run the full test suite._
### Ethereum 2.0 Spec Tests
The
[ethereum/eth2.0-spec-tests](https://github.com/ethereum/eth2.0-spec-tests/)
repository contains a large set of tests that verify Lighthouse behaviour
against the Ethereum Foundation specifications.
These tests are quite large (100's of MB), so we don't download them by
default. Developers should ensure they have downloaded these tests using the
`Makefile` in
[tests/ef_tests](https://github.com/sigp/lighthouse/tree/master/tests/ef_tests).
**Failures in these tests should prevent CI from passing.**

62
book/src/cli.md Normal file
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@ -0,0 +1,62 @@
# Command-Line Interface (CLI)
Lighthouse a collection of CLI applications. The two primary binaries are:
- `beacon_node`: the largest and most fundamental component which connects to
the p2p network, processes messages and tracks the head of the beacon
chain.
- `validator_client`: a lightweight but important component which loads a validators private
key and signs messages using a `beacon_node` as a source-of-truth.
There are also some ancillary binaries:
- `account_manager`: generates cryptographic keys.
- `lcli`: a general-purpose utility for troubleshooting Lighthouse state
transitions (developer tool).
## Installation
Presently, we recommend building Lighthouse using the `$ cargo build --release
--all` command and executing binaries from the
`<lighthouse-repository>/target/release` directory.
## Documentation
Each binary supports the `--help` flag, this is the best source of
documentation.
```bash
$ ./beacon_node --help
```
```bash
$ ./validator_client --help
```
```bash
$ ./account_manager --help
```
```bash
$ ./lcli --help
```
## Beacon Node
The `beacon_node` CLI has two primary tasks:
- **Resuming** an existing database with `$ ./beacon_node`.
- **Creating** a new testnet database using `$ ./beacon_node testnet`.
## Creating a new database
Use the `$./beacon_node testnet` command (see [testnets](./testnets.md) for more
information).
## Resuming from an existing database
Once a database has been created, it can be resumed by running `$ ./beacon_node`.
Presently, this command will fail if no existing database is found. You must
use the `$ ./beacon_node testnet` command to create a new database.

118
book/src/contributing.md Normal file
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@ -0,0 +1,118 @@
# Contributing to Lighthouse
[![Chat Badge]][Chat Link]
[Chat Badge]: https://img.shields.io/badge/chat-discord-%237289da
[Chat Link]: https://discord.gg/cyAszAh
Lighthouse welcomes contributions. If you are interested in contributing to the
Ethereum ecosystem, and you want to learn Rust, Lighthouse is a great project
to work on.
To start contributing,
1. Setup a [development environment](./setup.md).
2. Browse through the [open issues](https://github.com/sigp/lighthouse/issues)
(tip: look for the [good first
issue](https://github.com/sigp/lighthouse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
tag).
3. Comment on an issue before starting work.
4. Share your work via a pull-request.
If you have questions, please reach out via
[Discord](https://discord.gg/cyAszAh).
## Ethereum 2.0
Lighthouse is an implementation of the Ethereum 2.0 specification, as defined
in the [ethereum/eth2.0-specs](https://github.com/ethereum/eth2.0-specs)
repository.
We recommend reading Danny Ryan's (incomplete) [Phase 0 for
Humans](https://notes.ethereum.org/@djrtwo/Bkn3zpwxB?type=view) before diving
into the canonical spec.
## Rust
Lighthouse adheres to Rust code conventions as outlined in the [**Rust
Styleguide**](https://github.com/rust-dev-tools/fmt-rfcs/blob/master/guide/guide.md).
Please use [clippy](https://github.com/rust-lang/rust-clippy) and
[rustfmt](https://github.com/rust-lang/rustfmt) to detect common mistakes and
inconsistent code formatting:
```bash
$ cargo clippy --all
$ cargo fmt --all --check
```
### Panics
Generally, **panics should be avoided at all costs**. Lighthouse operates in an
adversarial environment (the Internet) and it's a severe vulnerability if
people on the Internet can cause Lighthouse to crash via a panic.
Always prefer returning a `Result` or `Option` over causing a panic. For
example, prefer `array.get(1)?` over `array[1]`.
If you know there won't be a panic but can't express that to the compiler,
use `.expect("Helpful message")` instead of `.unwrap()`. Always provide
detailed reasoning in a nearby comment when making assumptions about panics.
### TODOs
All `TODO` statements should be accompanied by a GitHub issue.
```rust
pub fn my_function(&mut self, _something &[u8]) -> Result<String, Error> {
// TODO: something_here
// https://github.com/sigp/lighthouse/issues/XX
}
```
### Comments
**General Comments**
* Prefer line (``//``) comments to block comments (``/* ... */``)
* Comments can appear on the line prior to the item or after a trailing space.
```rust
// Comment for this struct
struct Lighthouse {}
fn make_blockchain() {} // A comment on the same line after a space
```
**Doc Comments**
* The ``///`` is used to generate comments for Docs.
* The comments should come before attributes.
```rust
/// Stores the core configuration for this Lighthouse instance.
/// This struct is general, other components may implement more
/// specialized config structs.
#[derive(Clone)]
pub struct LighthouseConfig {
pub data_dir: PathBuf,
pub p2p_listen_port: u16,
}
```
### Rust Resources
Rust is an extremely powerful, low-level programming language that provides
freedom and performance to create powerful projects. The [Rust
Book](https://doc.rust-lang.org/stable/book/) provides insight into the Rust
language and some of the coding style to follow (As well as acting as a great
introduction and tutorial for the language).
Rust has a steep learning curve, but there are many resources to help. We
suggest:
* [Rust Book](https://doc.rust-lang.org/stable/book/)
* [Rust by example](https://doc.rust-lang.org/stable/rust-by-example/)
* [Learning Rust With Entirely Too Many Linked Lists](http://cglab.ca/~abeinges/blah/too-many-lists/book/)
* [Rustlings](https://github.com/rustlings/rustlings)
* [Rust Exercism](https://exercism.io/tracks/rust)
* [Learn X in Y minutes - Rust](https://learnxinyminutes.com/docs/rust/)

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# HTTP API
[![Swagger Badge]][Swagger Link]
[Swagger Badge]: https://img.shields.io/badge/Open%20API-0.2.0-success
[Swagger Link]: https://app.swaggerhub.com/apis-docs/spble/lighthouse_rest_api/0.2.0
**The Lighthouse API is documented in Open API format and is available at
[SwaggerHub: Lighthouse REST
API](https://app.swaggerhub.com/apis-docs/spble/lighthouse_rest_api/0.2.0).**
By default, a Lighthouse `beacon_node` exposes a HTTP server on `localhost:5052`.
The following CLI flags control the HTTP server:
- `--no-api`: disable the HTTP server.
- `--api-port`: specify the listen port of the server.
- `--api-address`: specify the listen address of the server.
## Examples
In addition to the complete Open API docs (see above), some examples are
provided below.
_Examples assume there is a Lighthouse node exposing a HTTP API on
`localhost:5052`. Responses are JSON._
### Get the node's beacon chain head
```bash
$ curl localhost:5052/beacon/head
{"slot":0,"block_root":"0x827bf71805540aa13f6d8c7d18b41b287b2094a4d7a28cbb8deb061dbf5df4f5","state_root":"0x90a78d73294bc9c7519a64e1912161be0e823eb472012ff54204e15a4d717fa5"}%
```
### Get the node's finalized checkpoint
```bash
$ curl localhost:5052/beacon/latest_finalized_checkpoint
{"epoch":0,"root":"0x0000000000000000000000000000000000000000000000000000000000000000"}%
```
### Get the node's ENR
```bash
$ curl localhost:5052/network/enr
"-IW4QFyf1VlY5pZs0xZuvKMRZ9_cdl9WMCDAAJXZiZiuGcfRYoU40VPrYDLQj5prneJIz3zcbTjHp9BbThc-yiymJO8HgmlwhH8AAAGDdGNwgiMog3VkcIIjKIlzZWNwMjU2azGhAjg0-DsTkQynhJCRnLLttBK1RS78lmUkLa-wgzAi-Ob5"%
```
### Get a list of connected peer ids
```bash
$ curl localhost:5052/network/peers
["QmeMFRTWfo3KbVG7dEBXGhyRMa29yfmnJBXW84rKuGEhuL"]%
```
### Get the node's peer id
```bash
$ curl localhost:5052/network/peer_id
"QmRD1qs2AqNNRdBcGHUGpUGkpih5cmdL32mhh22Sy79xsJ"%
```
### Get the list of listening libp2p addresses
Lists all the libp2p multiaddrs that the node is listening on.
```bash
$ curl localhost:5052/network/listen_addresses
["/ip4/127.0.0.1/tcp/9000","/ip4/192.168.1.121/tcp/9000","/ip4/172.17.0.1/tcp/9000","/ip4/172.42.0.1/tcp/9000","/ip6/::1/tcp/9000","/ip6/fdd3:c293:1bc::203/tcp/9000","/ip6/fdd3:c293:1bc:0:9aa9:b2ea:c610:44db/tcp/9000"]%
```
### Pretty-print the genesis state and state root
Returns the genesis state and state root in your terminal, in YAML.
```bash
$ curl --header "Content-Type: application/yaml" "localhost:5052/beacon/state?slot=0"
```

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# Interop Cheat-sheet
This document contains a list of tips and tricks that may be useful during
interop testing.
- When starting a beacon node:
- [Specify a boot node by multiaddr](#boot-node-multiaddr)
- [Specify a boot node by ENR](#boot-node-enr)
- [Avoid port clashes when starting multiple nodes](#port-bump)
- [Specify a custom slot time](#slot-time)
- Using the beacon node HTTP API:
- [Pretty-print the genesis state and state root](#http-state)
- [Curl a node's ENR](#http-enr)
- [Curl a node's connected peers](#http-peer-ids)
- [Curl a node's local peer id](#http-peer-id)
- [Curl a node's listening multiaddrs](#http-listen-addresses)
- [Curl a node's beacon chain head](#http-head)
- [Curl a node's finalized checkpoint](#http-finalized)
## Category: CLI
The `--help` command provides detail on the CLI interface. Here are some
interop-specific CLI commands.
<a name="boot-node-multiaddr"></a>
### Specify a boot node by multiaddr
You can specify a static list of multiaddrs when booting Lighthouse using
the `--libp2p-addresses` command.
#### Example:
```
$ ./beacon_node --libp2p-addresses /ip4/192.168.0.1/tcp/9000
```
<a name="boot-node-enr"></a>
### Specify a boot node by ENR
You can specify a static list of Discv5 addresses when booting Lighthouse using
the `--boot-nodes` command.
#### Example:
```
$ ./beacon_node --boot-nodes -IW4QB2Hi8TPuEzQ41Cdf1r2AUU1FFVFDBJdJyOkWk2qXpZfFZQy2YnJIyoT_5fnbtrXUouoskmydZl4pIg90clIkYUDgmlwhH8AAAGDdGNwgiMog3VkcIIjKIlzZWNwMjU2azGhAjg0-DsTkQynhJCRnLLttBK1RS78lmUkLa-wgzAi-Ob5
```
<a name="port-bump"></a>
### Avoid port clashes when starting nodes
Starting a second Lighthouse node on the same machine will fail due to TCP/UDP
port collisions. Use the `-b` (`--port-bump`) flag to increase all listening
ports by some `n`.
#### Example:
Increase all ports by `10` (using multiples of `10` is recommended).
```
$ ./beacon_node -b 10
```
<a name="slot-time"></a>
### Start a testnet with a custom slot time
Lighthouse can run at quite low slot times when there are few validators (e.g.,
`500 ms` slot times should be fine for 8 validators).
#### Example
The `-t` (`--slot-time`) flag specifies the milliseconds per slot.
```
$ ./beacon_node testnet -t 500 recent 8
```
> Note: `bootstrap` loads the slot time via HTTP and therefore conflicts with
> this flag.
## Category: HTTP API
Examples assume there is a Lighthouse node exposing a HTTP API on
`localhost:5052`. Responses are JSON.
<a name="http-state"></a>
### Pretty-print the genesis state and state root
Returns the genesis state and state root in your terminal, in YAML.
```
$ curl --header "Content-Type: application/yaml" "localhost:5052/beacon/state?slot=0"
```
<a name="http-enr"></a>
### Get the node's ENR
```
$ curl localhost:5052/network/enr
"-IW4QFyf1VlY5pZs0xZuvKMRZ9_cdl9WMCDAAJXZiZiuGcfRYoU40VPrYDLQj5prneJIz3zcbTjHp9BbThc-yiymJO8HgmlwhH8AAAGDdGNwgiMog3VkcIIjKIlzZWNwMjU2azGhAjg0-DsTkQynhJCRnLLttBK1RS78lmUkLa-wgzAi-Ob5"%
```
<a name="http-peer-ids"></a>
### Get a list of connected peer ids
```
$ curl localhost:5052/network/peers
["QmeMFRTWfo3KbVG7dEBXGhyRMa29yfmnJBXW84rKuGEhuL"]%
```
<a name="http-peer-id"></a>
### Get the node's peer id
```
curl localhost:5052/network/peer_id
"QmRD1qs2AqNNRdBcGHUGpUGkpih5cmdL32mhh22Sy79xsJ"%
```
<a name="http-listen-addresses"></a>
### Get the list of listening libp2p addresses
Lists all the libp2p multiaddrs that the node is listening on.
```
curl localhost:5052/network/listen_addresses
["/ip4/127.0.0.1/tcp/9000","/ip4/192.168.1.121/tcp/9000","/ip4/172.17.0.1/tcp/9000","/ip4/172.42.0.1/tcp/9000","/ip6/::1/tcp/9000","/ip6/fdd3:c293:1bc::203/tcp/9000","/ip6/fdd3:c293:1bc:0:9aa9:b2ea:c610:44db/tcp/9000"]%
```
<a name="http-head"></a>
### Get the node's beacon chain head
```
curl localhost:5052/beacon/head
{"slot":0,"block_root":"0x827bf71805540aa13f6d8c7d18b41b287b2094a4d7a28cbb8deb061dbf5df4f5","state_root":"0x90a78d73294bc9c7519a64e1912161be0e823eb472012ff54204e15a4d717fa5"}%
```
<a name="http-finalized"></a>
### Get the node's finalized checkpoint
```
curl localhost:5052/beacon/latest_finalized_checkpoint
{"epoch":0,"root":"0x0000000000000000000000000000000000000000000000000000000000000000"}%
```

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# Interop CLI Overview
The Lighthouse CLI has two primary tasks:
- **Resuming** an existing database with `$ ./beacon_node`.
- **Creating** a new testnet database using `$ ./beacon_node testnet`.
_See [Scenarios](./interop-scenarios.md) for methods we've anticipated will be
used interop._
## Creating a new database
There are several methods for creating a new beacon node database:
- `quick`: using the `(validator_client, genesis_time)` tuple.
- `recent`: as above but `genesis_time` is set to the start of some recent time
window.
- `file`: loads the genesis file from disk in one of multiple formats.
- `bootstrap`: a Lighthouse-specific method where we connect to a running node
and download it's specification and genesis state via the HTTP API.
See `$ ./beacon_node testnet --help` for more detail.
## Resuming from an existing database
Once a database has been created, it can be resumed by running `$ ./beacon_node`.
Presently, this command will fail if no existing database is found. You must
use the `$ ./beacon_node testnet` command to create a new database.

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# Interop Environment
All that is required for inter-op is a built and tested [development
environment](./setup.md).
## Repositories
You will only require the [sigp/lighthouse](http://github.com/sigp/lighthouse)
library.
To allow for faster build/test iterations we will use the
[`interop`](https://github.com/sigp/lighthouse/tree/interop) branch of
[sigp/lighthouse](https://github.com/sigp/lighthouse/tree/interop) for
September 2019 interop. **Please use ensure you `git checkout interop` after
cloning the repo.**
## File System
When lighthouse boots, it will create the following
directories:
- `~/.lighthouse`: database and configuration for the beacon node.
- `~/.lighthouse-validator`: database and configuration for the validator
client.
After building the binaries with `cargo build --release --all`, there will be a
`target/release` directory in the root of the Lighthouse repository. This is
where the `beacon_node` and `validator_client` binaries are located.
You do not need to create any of these directories manually.

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# Interop Scenarios
Here we demonstrate some expected interop scenarios.
All scenarios assume a working [development environment](./setup.md) and
commands are based in the `target/release` directory (this is the build dir for
`cargo`).
Additional functions can be found in the [interop
cheat-sheet](./interop-cheat-sheet.md).
### Table of contents
- [Starting from a`validator_count, genesis_time` tuple](#quick-start)
- [Starting a node from a genesis state file](#state-file)
- [Starting a validator client](#val-client)
- [Exporting a genesis state file](#export) from a running Lighthouse
node
<a name="quick-start"></a>
### Start beacon node given a validator count and genesis_time
To start a brand-new beacon node (with no history) use:
```
$ ./beacon_node testnet -f quick 8 <GENESIS_TIME>
```
Where `GENESIS_TIME` is in [unix time](https://duckduckgo.com/?q=unix+time&t=ffab&ia=answer).
> Notes:
>
> - This method conforms the ["Quick-start
genesis"](https://github.com/ethereum/eth2.0-pm/tree/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start#quick-start-genesis)
method in the `ethereum/eth2.0-pm` repository.
> - The `-f` flag ignores any existing database or configuration, backing them
> up before re-initializing.
> - `8` is the validator count and `1567222226` is the genesis time.
> - See `$ ./beacon_node testnet quick --help` for more configuration options.
<a name="state-file"></a>
### Start Beacon Node given a genesis state file
A genesis state can be read from file using the `testnet file` subcommand.
There are three supported formats:
- `ssz` (default)
- `json`
- `yaml`
Start a new node using `/tmp/genesis.ssz` as the genesis state:
```
$ ./beacon_node testnet --spec minimal -f file ssz /tmp/genesis.ssz
```
> Notes:
>
> - The `-f` flag ignores any existing database or configuration, backing them
> up before re-initializing.
> - See `$ ./beacon_node testnet file --help` for more configuration options.
> - The `--spec` flag is required to allow SSZ parsing of fixed-length lists.
<a name="val-client"></a>
### Start an auto-configured validator client
To start a brand-new validator client (with no history) use:
```
$ ./validator_client testnet -b insecure 0 8
```
> Notes:
>
> - The `-b` flag means the validator client will "bootstrap" specs and config
> from the beacon node.
> - The `insecure` command dictates that the [interop keypairs](https://github.com/ethereum/eth2.0-pm/tree/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start#pubkeyprivkey-generation)
> will be used.
> - The `0 8` indicates that this validator client should manage 8 validators,
> starting at validator 0 (the first deposited validator).
> - The validator client will try to connect to the beacon node at `localhost`.
> See `--help` to configure that address and other features.
> - The validator client will operate very unsafely in `testnet` mode, happily
> swapping between chains and creating double-votes.
<a name="export"></a>
### Exporting a genesis file
Genesis states can downloaded from a running Lighthouse node via the HTTP API. Three content-types are supported:
- `application/json`
- `application/yaml`
- `application/ssz`
Using `curl`, a genesis state can be downloaded to `/tmp/genesis.ssz`:
```
$ curl --header "Content-Type: application/ssz" "localhost:5052/beacon/state/genesis" -o /tmp/genesis.ssz
```

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# Lighthouse Interop Guide
This guide is intended for other Ethereum 2.0 client developers performing
inter-operability testing with Lighthouse.
## Chapters
- Read about the required [development environment](./interop-environment.md).
- Get an [overview](./interop-cli.md) of the Lighthouse CLI.
- See how we expect to handle some [interop scenarios](./interop-scenarios.md).
- See the [interop cheat-sheet](./interop-cheat-sheet.md) for useful CLI tips.

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# Lighthouse Documentation
# Lighthouse Book
[![Build Status]][Build Link] [![Doc Status]][Doc Link] [![Chat Badge]][Chat Link]
_Documentation for Lighthouse users and developers._
[![Doc Status]][Doc Link] [![Chat Badge]][Chat Link]
[Build Status]: https://gitlab.sigmaprime.io/sigp/lighthouse/badges/master/build.svg
[Build Link]: https://gitlab.sigmaprime.io/sigp/lighthouse/pipelines
[Chat Badge]: https://img.shields.io/badge/chat-discord-%237289da
[Chat Link]: https://discord.gg/cyAszAh
[Doc Status]:https://img.shields.io/badge/rust--docs-master-orange
@ -12,16 +12,27 @@
Lighthouse is an **Ethereum 2.0 client** that connects to other Ethereum 2.0
clients to form a resilient and decentralized proof-of-stake blockchain.
It is written in Rust, maintained by Sigma Prime and funded by the Ethereum
Foundation, Consensys and other individuals and organisations.
We implement the specification as defined in the
[ethereum/eth2.0-specs](https://github.com/ethereum/eth2.0-specs) repository.
## Developer Resources
## Topics
Documentation is presently targeted at **researchers and developers**. It
assumes significant prior knowledge of Ethereum 2.0.
Topics:
You may read this book from start to finish, or jump to some of these topics:
- Get started with [development environment setup](./setup.md).
- See the [interop docs](./interop.md).
- [Run a simple testnet](./simple-testnet.md) in Only Three CLI Commands™.
- Utilize the whole stack by starting a [simple local testnet](./simple-testnet.md).
- Query the [RESTful HTTP API](./http.md) using `curl`.
- Listen to events with the [JSON WebSocket API](./websockets.md).
- View the [Rust code docs](http://lighthouse-docs.sigmaprime.io/).
Prospective contributors can read the [Contributing](./contributing.md) section
to understand how we develop and test Lighthouse.
## About this Book
This book is open source, contribute at
[github.com/sigp/lighthouse/book](https://github.com/sigp/lighthouse/tree/master/book).
The Lighthouse CI/CD system maintains a hosted version of the `master` branch
at [lighthouse-book.sigmaprime.io](http://lighthouse-book.sigmaprime.io).

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# Development Environment Setup
Follow this guide to get a Lighthouse development environment up-and-running.
## Linux, MacOS & Windows
See the [Quick instructions](#quick-instructions) for a summary or the
[Detailed instructions](#detailed-instructions) for clarification.
## Quick instructions
1. Install Rust + Cargo with [rustup](https://rustup.rs/).
1. Install Rust and Cargo with [rustup](https://rustup.rs/).
- Use the `stable` toolchain (it's the default).
1. Install build dependencies using your package manager.
- `$ <package-manager> clang protobuf libssl-dev cmake`
1. Clone the [sigp/lighthouse](https://github.com/sigp/lighthouse).
1. In the root of the repo, run the tests with `cargo test --all --release`.
1. Then, build the binaries with `cargo build --all --release`.
1. Lighthouse is now fully built and tested.
- `clang`, `protobuf`, `libssl-dev`, `cmake`
1. Clone the [github.com/sigp/lighthouse](https://github.com/sigp/lighthouse)
repository.
1. Run `$ make` to build Lighthouse.
1. Run `$ make test` to run the test suite
- If you experience any failures, please reach out on
[discord](https://discord.gg/cyAszAh).
- Developers use `$ make test-full` to ensure you have the full set of
test vectors.
_Note: first-time compilation may take several minutes._
> - The `beacon_node`, `validator_client` and other binaries are created in
> `target/release` directory.
> - First-time compilation may take several minutes.
## Detailed instructions
### Windows
A fully-featured development environment can be achieved with the following
steps:
1. Install [rustup](https://rustup.rs/).
1. Use the command `rustup show` to get information about the Rust
installation. You should see that the active tool-chain is the stable
version.
- Updates can be performed using` rustup update`, Lighthouse generally
requires a recent version of Rust.
1. Install build dependencies (Arch packages are listed here, your
distribution will likely be similar):
- `clang`: required by RocksDB.
- `protobuf`: required for protobuf serialization (gRPC)
- `libssl-dev`: also gRPC
- `cmake`: required for building protobuf
1. Clone the repository with submodules: `git clone
https://github.com/sigp/lighthouse`.
1. Change directory to the root of the repository.
1. Run the test suite with `cargo test --all --release`. The build and test
process can take several minutes. If you experience any failures on
`master`, please raise an
[issue](https://github.com/sigp/lighthouse/issues).
### Notes:
Lighthouse targets Rust `stable` but generally runs on `nightly` too.
#### Note for Windows users:
Perl may also be required to build lighthouse. You can install [Strawberry
Perl](http://strawberryperl.com/), or alternatively use a choco install command
`choco install strawberryperl`.
Perl may also be required to build Lighthouse. You can install [Strawberry
Perl](http://strawberryperl.com/), or alternatively if you're using the [Chocolatey](https://chocolatey.org/) package manager for Windows, use the following choco install command: `choco install strawberryperl`.
Additionally, the dependency `protoc-grpcio v0.3.1` is reported to have issues
compiling in Windows. You can specify a known working version by editing
version in `protos/Cargo.toml` section to `protoc-grpcio = "<=0.3.0"`.
## eth2.0-spec-tests
The
[ethereum/eth2.0-spec-tests](https://github.com/ethereum/eth2.0-spec-tests/)
repository contains a large set of tests that verify Lighthouse behaviour
against the Ethereum Foundation specifications.
The `tests/ef_tests` crate runs these tests and it has some interesting
behaviours:
- If the `tests/ef_tests/eth2.0-spec-tests` directory is not present, all tests
indicate a `pass` when they did not actually run.
- If that directory _is_ present, the tests are executed faithfully, failing if
a discrepancy is found.
The `tests/ef_tests/eth2.0-spec-tests` directory is not present by default. To
obtain it, use the Makefile in the root of the repository:
```
make ef_tests
```
_Note: this will download 100+ MB of test files from the [ethereum/eth2.0-spec-tests](https://github.com/ethereum/eth2.0-spec-tests/)._

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# Simple Local Testnet
You can setup a local, two-node testnet in **Only Three CLI Commands™**.
Follow the [Quick instructions](#tldr) version if you're confident, or see
[Detailed instructions](#detail) for more.
## Quick instructions
Setup a development environment, build the project and navigate to the
`target/release` directory.
With a functional [development environment](./setup.md), starting a local multi-node
testnet is easy:
1. Start the first node: `$ ./beacon_node testnet -f recent 8`
1. Start a validator client: `$ ./validator_client testnet -b insecure 0 8`
1. Start another node `$ ./beacon_node -b 10 testnet -f bootstrap http://localhost:5052`
1. Start more nodes with `$ ./beacon_node -b 10 testnet -f bootstrap
http://localhost:5052`
- Increment the `-b` value by `10` for each additional node.
_Repeat #3 to add more nodes._
## Detailed instructions
## Detailed Instructions
First, setup a Lighthouse development environment and navigate to the
`target/release` directory (this is where the binaries are located).
## Starting the Beacon Node
## Starting a beacon node
Start a new node (creating a fresh database and configuration in `~/.lighthouse`), using:
```
```bash
$ ./beacon_node testnet -f recent 8
```
@ -38,11 +30,11 @@ $ ./beacon_node testnet -f recent 8
> - See `$ ./beacon_node testnet recent --help` for more configuration options,
> including `minimal`/`mainnet` specification.
## Starting the Validator Client
## Starting a validator client
In a new terminal window, start the validator client with:
```
```bash
$ ./validator_client testnet -b insecure 0 8
```
@ -57,15 +49,15 @@ $ ./validator_client testnet -b insecure 0 8
> - The validator client will try to connect to the beacon node at `localhost`.
> See `--help` to configure that address and other features.
## Adding another Beacon Node
## Adding another beacon node
You may connect another (non-validating) node to your local network using the
lighthouse `bootstrap` command.
In a new terminal terminal, run:
In a new terminal window, run:
```
```bash
$ ./beacon_node -b 10 testnet -r bootstrap
```

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# Testnets
Lighthouse does not offer a public testnet _yet_. In the meantime, it's easy to
start a local testnet:
The Lighthouse CLI has a `testnet` sub-command to allow creating or connecting
to Eth2 beacon chain testnets.
- [Run a simple testnet](testnets.html) in Only Three CLI Commands™.
- Developers of other Eth2 clients should see the [interop guide](interop.html).
- The [sigp/lighthouse-docker](https://github.com/sigp/lighthouse-docker) repo
contains a `docker-compose` setup that runs a multi-node network with
built-in metrics and monitoring dashboards, all from your local machine.
For detailed documentation, use the `--help` flag on the CLI:
```bash
$ ./beacon_node testnet --help
```
```bash
$ ./validator_client testnet --help
```
## Examples
All examples assume a working [development environment](./setup.md) and
commands are based in the `target/release` directory (this is the build dir for
`cargo`).
### Start a beacon node given a validator count and genesis_time
To start a brand-new beacon node (with no history) use:
```bash
$ ./beacon_node testnet -f quick 8 <GENESIS_TIME>
```
Where `GENESIS_TIME` is in [unix time](https://duckduckgo.com/?q=unix+time&t=ffab&ia=answer).
> Notes:
>
> - This method conforms the ["Quick-start
genesis"](https://github.com/ethereum/eth2.0-pm/tree/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start#quick-start-genesis)
method in the `ethereum/eth2.0-pm` repository.
> - The `-f` flag ignores any existing database or configuration, backing them
> up before re-initializing.
> - `8` is the validator count and `1567222226` is the genesis time.
> - See `$ ./beacon_node testnet quick --help` for more configuration options.
### Start a beacon node given a genesis state file
A genesis state can be read from file using the `testnet file` subcommand.
There are three supported formats:
- `ssz` (default)
- `json`
- `yaml`
Start a new node using `/tmp/genesis.ssz` as the genesis state:
```bash
$ ./beacon_node testnet --spec minimal -f file ssz /tmp/genesis.ssz
```
> Notes:
>
> - The `-f` flag ignores any existing database or configuration, backing them
> up before re-initializing.
> - See `$ ./beacon_node testnet file --help` for more configuration options.
> - The `--spec` flag is required to allow SSZ parsing of fixed-length lists.
> Here the `minimal` eth2 specification is chosen, allowing for lower
> validator counts. See
> [eth2.0-specs/configs](https://github.com/ethereum/eth2.0-specs/tree/dev/configs)
> for more info.
### Start an auto-configured validator client
To start a brand-new validator client (with no history) use:
```bash
$ ./validator_client testnet -b insecure 0 8
```
> Notes:
>
> - The `-b` flag means the validator client will "bootstrap" specs and config
> from the beacon node.
> - The `insecure` command dictates that the [interop keypairs](https://github.com/ethereum/eth2.0-pm/tree/6e41fcf383ebeb5125938850d8e9b4e9888389b4/interop/mocked_start#pubkeyprivkey-generation)
> will be used.
> - The `0 8` indicates that this validator client should manage 8 validators,
> starting at validator 0 (the first deposited validator).
> - The validator client will try to connect to the beacon node at `localhost`.
> See `--help` to configure that address and other features.
> - The validator client will operate very unsafely in `testnet` mode, happily
> swapping between chains and creating double-votes.
### Exporting a genesis file
Genesis states can downloaded from a running Lighthouse node via the HTTP API. Three content-types are supported:
- `application/json`
- `application/yaml`
- `application/ssz`
Using `curl`, a genesis state can be downloaded to `/tmp/genesis.ssz`:
```bash
$ curl --header "Content-Type: application/ssz" "localhost:5052/beacon/state/genesis" -o /tmp/genesis.ssz
```
## Advanced
Below are some CLI commands useful when working with testnets.
### Specify a boot node by multiaddr
You can specify a static list of multiaddrs when booting Lighthouse using
the `--libp2p-addresses` command.
#### Example:
```bash
$ ./beacon_node --libp2p-addresses /ip4/192.168.0.1/tcp/9000
```
### Specify a boot node by ENR (Ethereum Name Record)
You can specify a static list of Discv5 addresses when booting Lighthouse using
the `--boot-nodes` command.
#### Example:
```bash
$ ./beacon_node --boot-nodes -IW4QB2Hi8TPuEzQ41Cdf1r2AUU1FFVFDBJdJyOkWk2qXpZfFZQy2YnJIyoT_5fnbtrXUouoskmydZl4pIg90clIkYUDgmlwhH8AAAGDdGNwgiMog3VkcIIjKIlzZWNwMjU2azGhAjg0-DsTkQynhJCRnLLttBK1RS78lmUkLa-wgzAi-Ob5
```
### Avoid port clashes when starting nodes
Starting a second Lighthouse node on the same machine will fail due to TCP/UDP
port collisions. Use the `-b` (`--port-bump`) flag to increase all listening
ports by some `n`.
#### Example:
Increase all ports by `10` (using multiples of `10` is recommended).
```bash
$ ./beacon_node -b 10
```
### Start a testnet with a custom slot time
Lighthouse can run at quite low slot times when there are few validators (e.g.,
`500 ms` slot times should be fine for 8 validators).
#### Example:
The `-t` (`--slot-time`) flag specifies the milliseconds per slot.
```bash
$ ./beacon_node testnet -t 500 recent 8
```
> Note: `bootstrap` loads the slot time via HTTP and therefore conflicts with
> this flag.

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# Websocket Interface
# Websocket API
By default, a Lighthouse `beacon_node` exposes a websocket server on `localhost:5053`.

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# Lighthouse Documentation
_Lighthouse is a work-in-progress. Instructions are provided for running the
client, however these instructions are designed for developers and researchers
working on the project. We do not (yet) provide user-facing functionality._
## Introduction
- [Overview of Ethereum 2.0](serenity.md)
- [Development Environment Setup](env.md)
For client implementers looking to inter-op, see the [Inter-Op
Docs](interop.md).
## Command-line Interface
With the [development environment](env.md) configured, run `cargo build --all
--release` (this can take several minutes on the first build). Then,
navigate to the `target/release/` directory and read the CLI documentation
using:
```
$ ./beacon_node -h
```
The main [`README.md`](../README.md#simple-local-testnet) provides instructions
for running a small, local testnet.
## REST API
The beacon node provides a RESTful HTTP API which serves information about the
Beacon Chain, the P2P network and more.
This API is documented in the [`rest_oapi.yaml`](rest_oapi.yaml) Swagger YAML
file. There's an interactive version hosted on
[SwaggerHub](https://app.swaggerhub.com/apis/spble/lighthouse_rest_api/0.1.0).
The implementation of the Swagger API in Lighthouse is incomplete, we do not
(yet) guarantee that all routes are implemented.
## Configuration Files
Lighthouse uses [TOML](https://github.com/toml-lang/toml) files for
configuration. The following binaries use the following config files (they are
generated from defaults if they don't already exist):
- [Beacon Node](/beacon_node)
- [`~/.lighthouse/beacon_node.toml`](#beacon-nodetoml): the primary
configuration file for a beacon node.
- `~/.lighthouse/eth2-spec.toml`: defines chain-specific "constants" that
define an Ethereum 2.0 network.
- [Validator Client](/validator_client)
- `~/.lighthouse/validator_client.toml`: the primary configuration file for
a validator client.
- `~/.lighthouse/eth2-spec.toml`: defines chain-specific "constants" that
define an Ethereum 2.0 network.
_Note: default directories are shown, CLI flags can be used to override these
defaults._
#### `beacon-node.toml`
A TOML configuration file that defines the behaviour of the beacon node
runtime.
- Located in the `datadir` (default `~/.lighthouse`) as `beacon-node.toml`.
- Created from defaults if not present.
See the [example](config_examples/beacon-node.toml) for more information.

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#
# Beacon Node TOML configuration file.
#
# Defines the runtime configuration of a Lighthouse Beacon Node.
#
# The directory where beacon-node specific files will be placed. Includes the
# database and configuration files.
data_dir = ".lighthouse"
# The type of database used. Can be either:
#
# - "disk": LevelDB (almost always desired).
# - "memory": an in-memory hashmap (only used for testing).
db_type = "disk"
# The name of the LevelDB database directory, if any.
db_name = "chain_db"
# If specified, all logs will be written to this file.
log_file = ""
# Defines the Ethereum 2.0 specification set to be used:
#
# - "mainnet": parameters expected to be used for Eth2 mainnet.
# - "minimal": smaller, more efficient parameters used for testing.
spec_constants = "minimal"
#
# The "genesis_state" object defines how the genesis state should be created.
#
# The "RecentGenesis" type assumes that genesis started at the beginning of the
# most-recent 30 minute window (e.g., 08:00, 08:30, 09:00, ...).
[genesis_state]
type = "RecentGenesis"
validator_count = 16
# "Generated" is the same as "RecentGenesis", however allows for manual
# specification of the genesis_time.
#
# [genesis_state]
# type = "Generated"
# validator_count = 16
# genesis_time = 1564620118
# "Yaml" loads a full genesis state from YAML file.
#
# [genesis_state]
# type = "Yaml"
# file = "~/genesis_state.yaml"
#
# P2P networking configuration.
#
[network]
# The directory for storing p2p network related files. E.g., p2p keys, peer
# lists, etc.
network_dir = "/home/paul/.lighthouse/network"
# The address that libp2p should use for incoming connections.
listen_address = "127.0.0.1"
# The port that libp2p should use for incoming connections.
libp2p_port = 9000
# The address that should listen for UDP peer-discovery.
discovery_address = "127.0.0.1"
# The port that should listen for UDP peer-discovery.
discovery_port = 9000
# Maximum number of libp2p peers.
max_peers = 10
# Boot nodes for initial peer discovery.
boot_nodes = []
# The client version, may be customized.
client_version = "Lighthouse/v0.1.0-unstable/x86_64-linux"
# A list of libp2p topics. Purpose unknown.
topics = []
#
# gRPC configuration. To be removed.
#
[rpc]
enabled = false
listen_address = "127.0.0.1"
port = 5051
#
# RESTful HTTP API server configuration.
#
[rest_api]
# Set to `true` to enable the gRPC server.
enabled = true
# The listen port for the HTTP server.
listen_address = "127.0.0.1"
# The listen port for the HTTP server.
port = 5052

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# Lighthouse Technical Documentation
The technical documentation, as generated by Rust, is available at [lighthouse-docs.sigmaprime.io](http://lighthouse-docs.sigmaprime.io/).
This documentation is generated from Lighthouse and updated regularly.
### How to update:
- `cargo doc`: builds the docs inside the `target/doc/` directory.
- `aws s3 sync target/doc/ s3://lighthouse-docs.sigmaprime.io/`: Uploads all of the docs, as generated with `cargo doc`, to the S3 bucket.
**Note**: You will need appropriate credentials to make the upload.

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# Development Environment Setup
_This document describes how to setup a development environment. It is intended
for software developers and researchers who wish to contribute to development._
Lighthouse is a Rust project and [`cargo`](https://doc.rust-lang.org/cargo/) is
used extensively. As such, you'll need to install Rust in order to build the
project. Generally, Rust is installed using the
[rustup](https://www.rust-lang.org/tools/install) tool-chain manager.
## Steps
A fully-featured development environment can be achieved with the following
steps:
1. Install [rustup](https://rustup.rs/).
1. Use the command `rustup show` to get information about the Rust
installation. You should see that the active tool-chain is the stable
version.
- Updates can be performed using` rustup update`, Lighthouse generally
requires a recent version of Rust.
1. Install build dependencies (Arch packages are listed here, your
distribution will likely be similar):
- `clang`: required by RocksDB.
- `protobuf`: required for protobuf serialization (gRPC)
- `libssl-dev`: also gRPC
- `cmake`: required for building protobuf
- `git-lfs`: The Git extension for [Large File
Support](https://git-lfs.github.com/) (required for Ethereum Foundation
test vectors).
1. Clone the repository with submodules: `git clone --recursive
https://github.com/sigp/lighthouse`. If you're already cloned the repo,
ensure testing submodules are present: `$ git submodule init; git
submodule update`
1. Change directory to the root of the repository.
1. Run the test suite with `cargo test --all --release`. The build and test
process can take several minutes. If you experience any failures on
`master`, please raise an
[issue](https://github.com/sigp/lighthouse/issues).
## Notes:
Lighthouse targets Rust `stable` but generally runs on `nightly` too.
### Note for Windows users:
Perl may also be required to build lighthouse. You can install [Strawberry
Perl](http://strawberryperl.com/), or alternatively use a choco install command
`choco install strawberryperl`.
Additionally, the dependency `protoc-grpcio v0.3.1` is reported to have issues
compiling in Windows. You can specify a known working version by editing
version in `protos/Cargo.toml` section to `protoc-grpcio = "<=0.3.0"`.

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# Lighthouse Inter-Op Docs
_These documents are intended for a highly technical audience, specifically
Ethereum 2.0 implementers._
This document provides details on how to use Lighthouse for inter-op testing.
## Steps
_Note: binaries are compiled into the `target/release` directory of the
repository. In this example, we run binaries assuming the user is in this
directory. E.g., running the beacon node binary can be achieved with
`$ ./target/release/beacon_node`. Those familiar with `cargo` may use the
equivalent (and more-convenient) `cargo run --release --` commands._
1. Setup a Lighthouse [development environment](env.md).
1. Build all the binaries using `cargo build --all --release`
1. Create default configuration files by running `$ ./beacon_node` and pressing
Ctrl+C after the node has started.
1. Follow the steps in [Genesis](#genesis) to configure the genesis state.
1. Follow the steps in [Networking](#networking) to launch a node with
appropriate networking parameters.
## Genesis
Lighthouse supports the following methods for generating a genesis state:
- [`Yaml`](#yaml): loads the genesis state from some YAML file (recommended
method).
- [`Generated`](#generated): generates a state given a `(validator_count,
genesis_time)`
tuple. _Note: this method is not yet fully specified and the state
generated is almost certainly not identical to other implementations._
- [`RecentGenesis`](#recentgenesis): identical to `Generated`, however the
`genesis_time` is set
to the previous 30-minute window. For example, if a state is generated at
`0845`, the genesis time will be `0830`.
You may configure a `beacon_node` to use one of these methods using the
[`beacon_node.toml`](README.md#beacon-nodetoml). There is a [documented
example](config_examples/) configuration file which includes an example for
each of these methods (see the `genesis_state` object).
### Yaml
This method involves loading a `BeaconState` from a YAML file. We provide
instructions for generating that YAML file and starting from it. If starting
from a pre-existing YAML file, simply skip the generation steps.
#### Generating a YAML file
The [cli_util](/tests/cli_util) generate YAML genesis state files. You can run
`$ ./cli_util genesis_yaml -h` to see documentation. We provide an example to
generate a YAML file with the following properties:
- 10 initial validators, each with [deterministic
keypairs](https://github.com/ethereum/eth2.0-pm/issues/60#issuecomment-512157915).
- The genesis file is stored in `~/.lighthouse/`, the default data directory
(an absolute path must be supplied).
- Genesis time is set to the time when the command is run (it can be customized
with the `-g` flag).
```
$ ./cli_util genesis_yaml -n 10 -f /home/user/.lighthouse/genesis_state.yaml
```
#### Configuring the Beacon Node
Modify the [`beacon-node.toml`](README.md#beacon-nodetoml) file to have the
following `genesiss_state` object (choosing the `file`):
```
[genesis_state]
type = "Yaml"
file = "/home/user/.lighthouse/genesis_state.yaml"
```
### Generated
Modify the [`beacon-node.toml`](README.md#beacon-nodetoml) file to have the
following `genesis_state` object (choosing the `validator_count` and
`genesis_time`):
```
[genesis_state]
type = "Generated"
validator_count = 16
genesis_time = 1564620118
```
### RecentGenesis
Modify the [`beacon-node.toml`](README.md#beacon-nodetoml) file to have the
following `genesis_state` object (choosing the `validator_count`):
```
[genesis_state]
type = "RecentGenesis"
validator_count = 16
```
## Networking
_TODO: provide details on config required to connect to some IP address._
## References
The BLS key generation method used should be identical to [this
implementation](https://github.com/ethereum/eth2.0-pm/issues/60#issuecomment-512157915).

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# Ethereum Serenity
This document aims at providing a high level understanding of Ethereum and the
Serenity phase of the Ethereum roadmap.
## The Blockchain
A blockchain can be seen as a decentralized, distributed ledger. The ledger of
transactions is replicated onto all nodes in the network. When a transaction
occurs, it is first propagated to the nodes. Once the nodes receive the
transaction, and verifies the correctness, the nodes attempt to batch the
transactions into a block and append the block to the ledger. Once the ledger
has been successfully appended onto, they propagate the block to the network.
If accepted, this block now becomes the latest block in the chain. If two people
propose a block at the same time, the one canonical blockchain forks. At this
point it must be resolved, and each system has it's own way of resolving these
forks.
![Blockchain](http://yuml.me/b0d6b30a.jpg)
<center>Figure 1. Example blockchain with a resolved fork.</center>
<br>
The idea of the blockchain was first proposed in the seminal [Bitcoin
whitepaper](https://bitcoin.org/bitcoin.pdf) by Satoshi Nakamoto. Since then, a
vast number of updates and blockchains have taken shape providing different
functionality or properties to the original blockchain.
## What is Ethereum?
Ethereum is an open blockchain protocol, allowing for the building and use of
decentralized applications that run on blockchain technology. Ethereum was one
of the initial platforms providing turing-complete code to be run on the
blockchain, allowing for conditional payments to occur through the use of this
code. Since then, Ethereum has advanced to allow for a number of Decentralized
Applications (DApps) to be developed and run completely with the blockchain as
the backbone.
General Ethereum Introduction:
* [What is Ethereum](http://ethdocs.org/en/latest/introduction/what-is-ethereum.html)
* [Ethereum Introduction](https://github.com/ethereum/wiki/wiki/Ethereum-introduction)
### Proof-of-Work and the current state of Ethereum.
Currently, Ethereum is based on the Proof-of-Work model, a Sybil resilient
mechanism to allow nodes to propose blocks to the network. Although it provides
properties that allow the blockchain to operate in an open, public
(permissionless) network, it faces it's challenges and as a result impacts
the operation of the blockchain.
The main goals to advance Ethereum is to (1) increase the scalability and
overall transaction processing power of the Ethereum world computer and (2)
find a suitable replacement for Proof-of-Work that still provides the necessary
properties that we need.
* [Proof-of-Work in Cryptocurrencies: an accessible introduction](https://blog.sigmaprime.io/what-is-proof-of-work.html)
## Serenity
Ethereum Serenity refers to a new blockchain system currently under development
by the Ethereum Foundation and the Ethereum community.
As part of the original Ethereum roadmap
[\[1\]](https://blog.ethereum.org/2015/03/03/ethereum-launch-process/)
[\[2\]](http://ethdocs.org/en/latest/introduction/the-homestead-release.html),
the Proof-of-Stake integration falls under **Release Step 4: *Serenity***. With
this, a number of changes are to be made to the current Ethereum protocol to
incorporate some of the new Proof-of-Stake mechanisms as well as improve on
some of the hindrances faced by the current Proof-of-Work chain.
To now advance the current Ethereum, the decision is made to move to a sharded
Beacon chain structure where multiple shard-chains will be operating and
interacting with a central beacon chain.The Serenity blockchain consists of
1,025 proof-of-stake blockchains. This includes the "beacon chain" and 1,024
"shard chains".
Ethereum Serenity is also known as "Ethereum 2.0" and "Shasper". We prefer
Serenity as it more accurately reflects the established Ethereum roadmap (plus
we think it's a nice name).
(Be mindful, the specifications change occasionally, so check these to keep up
to date)
* Current Specifications:
* [Danny Ryan's "State of the Spec"](https://notes.ethereum.org/s/BJEZWNoyE) (A nice summary of the current specifications)
* [Ethereum Serenity - Phase 0: Beacon Chain Spec](https://github.com/ethereum/eth2.0-specs/blob/master/specs/core/0_beacon-chain.md)
* [Ethereum Serenity - Phase 1: Sharded Data Chains](https://github.com/ethereum/eth2.0-specs/blob/master/specs/core/1_shard-data-chains.md)
* [Beacon Chain - Vitalik Buterin and Justin Drake explain](https://www.youtube.com/watch?v=GAywmwGToUI)
* Understanding Sharding:
* [Prysmatic Labs: Sharding Explained](https://medium.com/prysmatic-labs/how-to-scale-ethereum-sharding-explained-ba2e283b7fce)
* Other relevant resources
* [Proof of Stake - Casper FFG](https://www.youtube.com/watch?v=uQ3IqLDf-oo)
* [Justin Drake VDF Devcon4 Talk](https://www.youtube.com/watch?v=zqL_cMlPjOI)
### Beacon Chain
The concept of a beacon chain differs from existing blockchains, such as
Bitcoin and Ethereum, in that it doesn't process transactions per se. Instead,
it maintains a set of bonded (staked) validators and coordinates these to
provide services to a static set of *sub-blockchains* (i.e. shards). Each of
these shard blockchains processes normal transactions (e.g. "Transfer 5 ETH
from A to B") in parallel whilst deferring consensus mechanisms to the beacon
chain.
Major services provided by the beacon chain to its shards include the following:
- A source of entropy, likely using a [RANDAO + VDF
scheme](https://ethresear.ch/t/minimal-vdf-randomness-beacon/3566).
- Validator management, including:
- Inducting and ejecting validators.
- Assigning randomly-shuffled subsets of validators to particular shards.
- Penalizing and rewarding validators.
- Proof-of-stake consensus for shard chain blocks.
### Shard Chains
Shards are analogous to CPU cores - they're a resource where transactions can
execute in series (one-after-another). Presently, Ethereum is single-core and
can only _fully_ process one transaction at a time. Sharding allows processing
of multiple transactions simultaneously, greatly increasing the per-second
transaction capacity of Ethereum.
Each shard uses a proof-of-stake consensus mechanism and shares its validators
(stakers) with other shards. The beacon chain rotates validators
pseudo-randomly between different shards. Shards will likely be the basis of
layer-2 transaction processing schemes, however, that is not in scope of this
discussion.
### The Proof-of-Work Chain
The present-Ethereum proof-of-work (PoW) chain will host a smart contract that
enables accounts to deposit 32 ETH, a BLS public key, and some [other
parameters](https://github.com/ethereum/eth2.0-specs/blob/master/specs/casper_sharding_v2.1.md#pow-chain-changes),
allowing them to become beacon chain validators. Each beacon chain will
reference a PoW block hash allowing PoW clients to use the beacon chain as a
source of [Casper FFG finality](https://arxiv.org/abs/1710.09437), if desired.
It is a requirement that ETH can move freely between shard chains, as well as between
Serenity and present-Ethereum blockchains. The exact mechanics of these transfers remain
an active topic of research and their details are yet to be confirmed.
## Serenity Progress
Ethereum Serenity is not fully specified and a working implementation does not
yet exist. Some teams have demos available which indicate progress, but do not
constitute a complete product. We look forward to providing user functionality
once we are ready to provide a minimum-viable user experience.
The work-in-progress specifications live in the
[ethereum/eth2.0-specs](https://github.com/ethereum/eth2.0-specs) repository.
There is active discussion about the specification in the
[ethereum/sharding](https://gitter.im/ethereum/sharding) gitter channel. A
proof-of-concept implementation in Python is available at
[ethereum/beacon_chain](https://github.com/ethereum/beacon_chain).
Presently, the specification focuses almost exclusively on the beacon chain,
as it is the focus of current development efforts. Progress on shard chain
specification will soon follow.

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# Ethereum 2.0 Common Crates
# eth2
Rust crates containing logic common across the Lighthouse project.
## Per-Crate Summary
- [`attester/`](attester/): Core logic for attesting to beacon and shard blocks.
- [`block_proposer/`](block_proposer/): Core logic for proposing beacon blocks.
- [`fork_choice/`](fork_choice/): A collection of fork-choice algorithms for
the Beacon Chain.
- [`state_processing/`](state_processing/): Provides per-slot, per-block, and
per-epoch state processing.
- [`types/`](types/): Defines base Ethereum 2.0 types (e.g., `BeaconBlock`,
`BeaconState`, etc).
- [`utils/`](utils/):
- [`bls`](utils/bls/): A wrapper for an external BLS encryption library.
- [`fisher-yates-shuffle`](utils/fisher-yates-shuffle/): shuffles a list
pseudo-randomly.
- [`hashing`](utils/hashing/): A wrapper for external hashing libraries.
- [`honey-badger-split`](utils/honey-badger-split/): Splits a list in `n`
parts without giving AF about the length of the list, `n`, or anything
else.
- [`int-to-bytes`](utils/int-to-bytes/): Simple library which converts ints
into byte-strings of various lengths.
- [`slot_clock`](utils/slot_clock/): translates the system time into Beacon
Chain "slots". (Also provides another slot clock that's useful during
testing.)
- [`ssz`](utils/ssz/): an implementation of the SimpleSerialize
serialization/deserialization protocol used by Eth 2.0.
- [`ssz_derive`](utils/ssz_derive/): provides procedural macros for
deriving SSZ `Encode`, `Decode`, and `TreeHash` methods.
- [`swap_or_not_shuffle`](utils/swap_or_not_shuffle/): a list-shuffling
method which is slow, but allows for a subset of indices to be shuffled.
- [`test_random_derive`](utils/test_random_derive/): provides procedural
macros for deriving the `TestRandom` trait defined in `types`.
Common crates containing eth2-specific logic.

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@ -0,0 +1,11 @@
# lcli
A command-line debugging tool, inspired by [zcli](https://github.com/protolambda/zcli).
Allows for replaying state transitions from SSZ files to assist in fault-finding.
## Usage
```
$ cargo run --release -- --help
```

18
tests/ef_tests/Makefile Normal file
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@ -0,0 +1,18 @@
TESTS_TAG := v0.8.3
TESTS = general minimal mainnet
REPO_NAME := eth2.0-spec-tests
OUTPUT_DIR := ./$(REPO_NAME)
BASE_URL := https://github.com/ethereum/$(REPO_NAME)/releases/download/$(TESTS_TAG)
eth2.0-spec-tests:
mkdir $(OUTPUT_DIR)
for test in $(TESTS); do \
wget $(BASE_URL)/$$test.tar.gz; \
tar -xzvf $$test.tar.gz -C $(OUTPUT_DIR);\
rm $$test.tar.gz;\
done
clean:
rm -r $(OUTPUT_DIR)

30
tests/ef_tests/README.md Normal file
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@ -0,0 +1,30 @@
# Ethereum 2.0 Specification Tests
This crate parses and executes the test vectors at [ethereum/eth2.0-spec-tests](https://github.com/ethereum/eth2.0-spec-tests).
Functionality is achieved only via the `$ cargo test` command.
## Tests
Because the test vectors are very large, we do not download the
tests vectors or require that the tests pass by default. Specifically;
- If the `tests/ef_tests/eth2.0-spec-tests` directory is not present, all tests
indicate a `pass` when they did not actually run.
- If that directory _is_ present, the tests are executed faithfully, failing if
a discrepancy is found.
## Downloading Test Vectors
The `eth2.0-spec-tests` directory is not present by default. To
obtain it, use the Makefile:
```
$ make
```
_Note: this may download hundreds of MB of compressed archives from the
[ethereum/eth2.0-spec-tests](https://github.com/ethereum/eth2.0-spec-tests/),
which may expand into several GB of files._
Remove the tests to save space or update to a new version with `$ make clean`.

6
validator_client/src/block_producer/mod.rs
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@ -6,7 +6,6 @@ pub use self::beacon_node_block::{BeaconNodeError, PublishOutcome};
pub use self::grpc::BeaconBlockGrpcClient;
use crate::signer::Signer;
use core::marker::PhantomData;
use serde_json;
use slog::{error, info, trace, warn};
use std::sync::Arc;
use tree_hash::{SignedRoot, TreeHash};
@ -99,10 +98,7 @@ impl<'a, B: BeaconNodeBlock, S: Signer, E: EthSpec> BlockProducer<'a, B, S, E> {
warn!(self.log, "Signing rejected"; "message" => format!("{:?}", message));
return Ok(ValidatorEvent::SignerRejection(self.slot));
}
Some(signature) => {
info!(self.log, "Signed tree_hash_root for randao_reveal"; "message" => format!("{:?}", message), "signature" => serde_json::to_string(&signature).expect("We should always be able to serialize a signature as JSON."));
signature
}
Some(signature) => signature,
};
if let Some(block) = self