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/rest_api/src/lib.rs

@@ -1,15 +1,18 @@
 #[macro_use]
 extern crate lazy_static;
+extern crate network as client_network;
 
 mod beacon;
 mod config;
 mod helpers;
 mod metrics;
+mod network;
 mod node;
+mod spec;
 mod url_query;
 
 use beacon_chain::{BeaconChain, BeaconChainTypes};
-pub use config::Config as ApiConfig;
+use client_network::Service as NetworkService;
 use hyper::rt::Future;
 use hyper::service::service_fn_ok;
 use hyper::{Body, Method, Response, Server, StatusCode};
@@ -20,6 +23,9 @@ use std::sync::Arc;
 use tokio::runtime::TaskExecutor;
 use url_query::UrlQuery;
 
+pub use beacon::{BlockResponse, HeadResponse, StateResponse};
+pub use config::Config as ApiConfig;
+
 #[derive(PartialEq, Debug)]
 pub enum ApiError {
     MethodNotAllowed(String),
@@ -67,10 +73,11 @@ impl From<state_processing::per_slot_processing::Error> for ApiError {
     }
 }
 
-pub fn start_server<T: BeaconChainTypes + Clone + 'static>(
+pub fn start_server<T: BeaconChainTypes>(
     config: &ApiConfig,
     executor: &TaskExecutor,
     beacon_chain: Arc<BeaconChain<T>>,
+    network_service: Arc<NetworkService<T>>,
     db_path: PathBuf,
     log: &slog::Logger,
 ) -> Result<exit_future::Signal, hyper::Error> {
@@ -98,6 +105,7 @@ pub fn start_server<T: BeaconChainTypes + Clone + 'static>(
         let log = server_log.clone();
         let beacon_chain = server_bc.clone();
         let db_path = db_path.clone();
+        let network_service = network_service.clone();
 
         // Create a simple handler for the router, inject our stateful objects into the request.
         service_fn_ok(move |mut req| {
@@ -108,16 +116,34 @@ pub fn start_server<T: BeaconChainTypes + Clone + 'static>(
             req.extensions_mut()
                 .insert::<Arc<BeaconChain<T>>>(beacon_chain.clone());
             req.extensions_mut().insert::<DBPath>(db_path.clone());
+            req.extensions_mut()
+                .insert::<Arc<NetworkService<T>>>(network_service.clone());
 
             let path = req.uri().path().to_string();
 
             // Route the request to the correct handler.
             let result = match (req.method(), path.as_ref()) {
+                (&Method::GET, "/beacon/head") => beacon::get_head::<T>(req),
+                (&Method::GET, "/beacon/block") => beacon::get_block::<T>(req),
+                (&Method::GET, "/beacon/block_root") => beacon::get_block_root::<T>(req),
+                (&Method::GET, "/beacon/latest_finalized_checkpoint") => {
+                    beacon::get_latest_finalized_checkpoint::<T>(req)
+                }
                 (&Method::GET, "/beacon/state") => beacon::get_state::<T>(req),
                 (&Method::GET, "/beacon/state_root") => beacon::get_state_root::<T>(req),
                 (&Method::GET, "/metrics") => metrics::get_prometheus::<T>(req),
+                (&Method::GET, "/network/enr") => network::get_enr::<T>(req),
+                (&Method::GET, "/network/peer_count") => network::get_peer_count::<T>(req),
+                (&Method::GET, "/network/peer_id") => network::get_peer_id::<T>(req),
+                (&Method::GET, "/network/peers") => network::get_peer_list::<T>(req),
+                (&Method::GET, "/network/listen_port") => network::get_listen_port::<T>(req),
+                (&Method::GET, "/network/listen_addresses") => {
+                    network::get_listen_addresses::<T>(req)
+                }
                 (&Method::GET, "/node/version") => node::get_version(req),
                 (&Method::GET, "/node/genesis_time") => node::get_genesis_time::<T>(req),
+                (&Method::GET, "/spec") => spec::get_spec::<T>(req),
+                (&Method::GET, "/spec/slots_per_epoch") => spec::get_slots_per_epoch::<T>(req),
                 _ => Err(ApiError::MethodNotAllowed(path.clone())),
             };