Bootstrap (#501)

* Renamed fork_choice::process_attestation_from_block

* Processing attestation in fork choice

* Retrieving state from store and checking signature

* Looser check on beacon state validity.

* Cleaned up get_attestation_state

* Expanded fork choice api to provide latest validator message.

* Checking if the an attestation contains a latest message

* Correct process_attestation error handling.

* Copy paste error in comment fixed.

* Tidy ancestor iterators

* Getting attestation slot via helper method

* Refactored attestation creation in test utils

* Revert "Refactored attestation creation in test utils"

This reverts commit 4d277fe4239a7194758b18fb5c00dfe0b8231306.

* Integration tests for free attestation processing

* Implicit conflicts resolved.

* formatting

* Do first pass on Grants code

* Add another attestation processing test

* Tidy attestation processing

* Remove old code fragment

* Add non-compiling half finished changes

* Simplify, fix bugs, add tests for chain iters

* Remove attestation processing from op pool

* Fix bug with fork choice, tidy

* Fix overly restrictive check in fork choice.

* Ensure committee cache is build during attn proc

* Ignore unknown blocks at fork choice

* Various minor fixes

* Make fork choice write lock in to read lock

* Remove unused method

* Tidy comments

* Fix attestation prod. target roots change

* Fix compile error in store iters

* Reject any attestation prior to finalization

* Begin metrics refactor

* Move beacon_chain to new metrics structure.

* Make metrics not panic if already defined

* Use global prometheus gather at rest api

* Unify common metric fns into a crate

* Add heavy metering to block processing

* Remove hypen from prometheus metric name

* Add more beacon chain metrics

* Add beacon chain persistence metric

* Prune op pool on finalization

* Add extra prom beacon chain metrics

* Prefix BeaconChain metrics with "beacon_"

* Add more store metrics

* Add basic metrics to libp2p

* Add metrics to HTTP server

* Remove old `http_server` crate

* Update metrics names to be more like standard

* Fix broken beacon chain metrics, add slot clock metrics

* Add lighthouse_metrics gather fn

* Remove http args

* Fix wrong state given to op pool prune

* Make prom metric names more consistent

* Add more metrics, tidy existing metrics

* Fix store block read metrics

* Tidy attestation metrics

* Fix minor PR comments

* Fix minor PR comments

* Remove duplicated attestation finalization check

* Remove awkward `let` statement

* Add first attempts at HTTP bootstrap

* Add beacon_block methods to rest api

* Fix serde for block.body.grafitti

* Allow travis failures on beta (see desc)

There's a non-backward compatible change in `cargo fmt`. Stable and beta
do not agree.

* Add network routes to API

* Fix rustc warnings

* Add best_slot method

* Add --bootstrap arg to beacon node

* Get bootstrapper working for ENR address

* Store intermediate states during block processing

* Allow bootstrapper to scrape libp2p address

* Update bootstrapper libp2p address finding

* Add comments

* Tidy API to be more consistent with recent decisions

* Address some review comments

* Make BeaconChainTypes Send + Sync + 'static

* Add `/network/listen_port` API endpoint

* Abandon starting the node if libp2p doesn't start

* Update bootstrapper for API changes

* Remove unnecessary trait bounds

beacon_node/src/main.rs

@@ -200,6 +200,16 @@ fn main() {
                 .help("Sets the verbosity level")
                 .takes_value(true),
         )
+        /*
+         * Bootstrap.
+         */
+        .arg(
+            Arg::with_name("bootstrap")
+                .long("bootstrap")
+                .value_name("HTTP_SERVER")
+                .help("Load the genesis state and libp2p address from the HTTP API of another Lighthouse node.")
+                .takes_value(true)
+        )
         .get_matches();
 
     // build the initial logger
@@ -227,6 +237,11 @@ fn main() {
 
     let mut log = slog::Logger::root(drain.fuse(), o!());
 
+    warn!(
+        log,
+        "Ethereum 2.0 is pre-release. This software is experimental."
+    );
+
     let data_dir = match matches
         .value_of("datadir")
         .and_then(|v| Some(PathBuf::from(v)))

beacon_node/src/run.rs

@@ -4,7 +4,7 @@ use client::{
 };
 use futures::sync::oneshot;
 use futures::Future;
-use slog::{error, info, warn};
+use slog::{error, info};
 use std::cell::RefCell;
 use std::path::Path;
 use std::path::PathBuf;
@@ -42,11 +42,6 @@ pub fn run_beacon_node(
 
     let other_client_config = client_config.clone();
 
-    warn!(
-        log,
-        "Ethereum 2.0 is pre-release. This software is experimental."
-    );
-
     info!(
         log,
         "BeaconNode init";
@@ -123,7 +118,7 @@ fn run<T>(
     log: &slog::Logger,
 ) -> error::Result<()>
 where
-    T: BeaconChainTypes + InitialiseBeaconChain<T> + Clone + Send + Sync + 'static,
+    T: BeaconChainTypes + InitialiseBeaconChain<T> + Clone,
     T::Store: OpenDatabase,
 {
     let store = T::Store::open_database(&db_path)?;