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Validator API (#504)

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* Implemented more REST API endpoints.
 - Added many of the endpoints, which return 501 - Not Implemented
 - Created helper function to return a not implemented error
 - Created a parse_pubkey function to get a PublicKey from a hex string
 - Created a HTTP handler for the validator endpoints
 - Started implementing validator/duties endpoint.

* Fleshed out get validator duties.
 - Re-implemented the get validator duties function for the REST API
 - Added an 'as_hex_string' function to FakePublicKey, beacuse it was missing.

* Fixed small caching/state bug.

* Extended to array of API inputs.
 - Created  function for getting arrays from GET parameters.
 - Extended get validator duties function to support array of validator duties.

* Tidy API to be more consistent with recent decisions

* Addressing Paul's comments.
 - Cleaning up function to get list of proposers.
 - Removing unnecessary serde annotations
 - Clarifying error messages
 - Only accept pubkeys if they are '0x' prefixed.

* Fixed formatting with rustfmt.
This commit is contained in:
Luke Anderson 2019-08-28 00:40:35 +10:00
parent ce43a59fff
commit 328f11d564
No known key found for this signature in database
GPG Key ID: 44408169EC61E228
7 changed files with 253 additions and 6 deletions
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2
beacon_node/rest_api/Cargo.toml
View File

@ -6,6 +6,7 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
bls = { path = "../../eth2/utils/bls" }
beacon_chain = { path = "../beacon_chain" }
network = { path = "../network" }
eth2-libp2p = { path = "../eth2-libp2p" }
@ -29,3 +30,4 @@ url = "2.0"
lazy_static = "1.3.0"
lighthouse_metrics = { path = "../../eth2/utils/lighthouse_metrics" }
slot_clock = { path = "../../eth2/utils/slot_clock" }
hex = "0.3.2"

30
beacon_node/rest_api/src/helpers.rs
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@ -1,5 +1,10 @@
use crate::ApiError;
use crate::{ApiError, ApiResult};
use beacon_chain::{BeaconChain, BeaconChainTypes};
use bls::PublicKey;
use hex;
use hyper::{Body, Request, StatusCode};
use serde::de::value::StringDeserializer;
use serde_json::Deserializer;
use store::{iter::AncestorIter, Store};
use types::{BeaconState, EthSpec, Hash256, RelativeEpoch, Slot};
@ -31,6 +36,23 @@ pub fn parse_root(string: &str) -> Result<Hash256, ApiError> {
}
}
/// Parse a PublicKey from a `0x` prefixed hex string
pub fn parse_pubkey(string: &str) -> Result<PublicKey, ApiError> {
const PREFIX: &str = "0x";
if string.starts_with(PREFIX) {
let pubkey_bytes = hex::decode(string.trim_start_matches(PREFIX))
.map_err(|e| ApiError::InvalidQueryParams(format!("Invalid hex string: {:?}", e)))?;
let pubkey = PublicKey::from_bytes(pubkey_bytes.as_slice()).map_err(|e| {
ApiError::InvalidQueryParams(format!("Unable to deserialize public key: {:?}.", e))
})?;
return Ok(pubkey);
} else {
return Err(ApiError::InvalidQueryParams(
"Public key must have a '0x' prefix".to_string(),
));
}
}
/// Returns the root of the `BeaconBlock` in the canonical chain of `beacon_chain` at the given
/// `slot`, if possible.
///
@ -143,6 +165,12 @@ pub fn state_root_at_slot<T: BeaconChainTypes>(
}
}
pub fn implementation_pending_response(_req: Request<Body>) -> ApiResult {
Err(ApiError::NotImplemented(
"API endpoint has not yet been implemented, but is planned to be soon.".to_owned(),
))
}
#[cfg(test)]
mod test {
use super::*;

46
beacon_node/rest_api/src/lib.rs
View File

@ -10,6 +10,7 @@ mod network;
mod node;
mod spec;
mod url_query;
mod validator;
use beacon_chain::{BeaconChain, BeaconChainTypes};
use client_network::Service as NetworkService;
@ -123,14 +124,26 @@ pub fn start_server<T: BeaconChainTypes>(
// Route the request to the correct handler.
let result = match (req.method(), path.as_ref()) {
// Methods for Beacon Node
//TODO: Remove?
//(&Method::GET, "/beacon/best_slot") => beacon::get_best_slot::<T>(req),
(&Method::GET, "/beacon/head") => beacon::get_head::<T>(req),
(&Method::GET, "/beacon/block") => beacon::get_block::<T>(req),
(&Method::GET, "/beacon/blocks") => helpers::implementation_pending_response(req),
//TODO Is the below replaced by finalized_checkpoint?
(&Method::GET, "/beacon/chainhead") => {
helpers::implementation_pending_response(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),
//TODO: Add aggreggate/filtered state lookups here, e.g. /beacon/validators/balances
// Methods for Client
(&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),
@ -142,9 +155,40 @@ pub fn start_server<T: BeaconChainTypes>(
}
(&Method::GET, "/node/version") => node::get_version(req),
(&Method::GET, "/node/genesis_time") => node::get_genesis_time::<T>(req),
(&Method::GET, "/node/deposit_contract") => {
helpers::implementation_pending_response(req)
}
(&Method::GET, "/node/syncing") => helpers::implementation_pending_response(req),
(&Method::GET, "/node/fork") => helpers::implementation_pending_response(req),
// Methods for Network
(&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_addresses") => {
network::get_listen_addresses::<T>(req)
}
// Methods for Validator
(&Method::GET, "/validator/duties") => validator::get_validator_duties::<T>(req),
(&Method::GET, "/validator/block") => helpers::implementation_pending_response(req),
(&Method::POST, "/validator/block") => {
helpers::implementation_pending_response(req)
}
(&Method::GET, "/validator/attestation") => {
helpers::implementation_pending_response(req)
}
(&Method::POST, "/validator/attestation") => {
helpers::implementation_pending_response(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())),
_ => Err(ApiError::NotFound(
"Request path and/or method not found.".to_owned(),
)),
};
let response = match result {

23
beacon_node/rest_api/src/url_query.rs
View File

@ -2,6 +2,8 @@ use crate::ApiError;
use hyper::Request;
/// Provides handy functions for parsing the query parameters of a URL.
#[derive(Clone, Copy)]
pub struct UrlQuery<'a>(url::form_urlencoded::Parse<'a>);
impl<'a> UrlQuery<'a> {
@ -11,9 +13,7 @@ impl<'a> UrlQuery<'a> {
pub fn from_request<T>(req: &'a Request<T>) -> Result<Self, ApiError> {
let query_str = req.uri().query().ok_or_else(|| {
ApiError::InvalidQueryParams(
"URL query must be valid and contain at least one
key."
.to_string(),
"URL query must be valid and contain at least one key.".to_string(),
)
})?;
@ -60,6 +60,23 @@ impl<'a> UrlQuery<'a> {
)))
}
}
/// Returns a vector of all values present where `key` is in `keys
///
/// If no match is found, an `InvalidQueryParams` error is returned.
pub fn all_of(mut self, key: &str) -> Result<Vec<String>, ApiError> {
let queries: Vec<_> = self
.0
.filter_map(|(k, v)| {
if k.eq(key) {
Some(v.into_owned())
} else {
None
}
})
.collect();
Ok(queries)
}
}
#[cfg(test)]

149
beacon_node/rest_api/src/validator.rs Normal file
View File

@ -0,0 +1,149 @@
use super::{success_response, ApiResult};
use crate::{helpers::*, ApiError, UrlQuery};
use beacon_chain::{BeaconChain, BeaconChainTypes};
use bls::PublicKey;
use hyper::{Body, Request};
use serde::{Deserialize, Serialize};
use std::sync::Arc;
use store::Store;
use types::beacon_state::EthSpec;
use types::{BeaconBlock, BeaconState, Epoch, RelativeEpoch, Shard, Slot};
#[derive(Debug, Serialize, Deserialize)]
pub struct ValidatorDuty {
/// The validator's BLS public key, uniquely identifying them. _48-bytes, hex encoded with 0x prefix, case insensitive._
pub validator_pubkey: String,
/// The slot at which the validator must attest.
pub attestation_slot: Option<Slot>,
/// The shard in which the validator must attest.
pub attestation_shard: Option<Shard>,
/// The slot in which a validator must propose a block, or `null` if block production is not required.
pub block_proposal_slot: Option<Slot>,
}
impl ValidatorDuty {
pub fn new() -> ValidatorDuty {
ValidatorDuty {
validator_pubkey: "".to_string(),
attestation_slot: None,
attestation_shard: None,
block_proposal_slot: None,
}
}
}
/// HTTP Handler to retrieve a the duties for a set of validators during a particular epoch
pub fn get_validator_duties<T: BeaconChainTypes + 'static>(req: Request<Body>) -> ApiResult {
// Get beacon state
let beacon_chain = req
.extensions()
.get::<Arc<BeaconChain<T>>>()
.ok_or_else(|| ApiError::ServerError("Beacon chain extension missing".to_string()))?;
let _ = beacon_chain
.ensure_state_caches_are_built()
.map_err(|e| ApiError::ServerError(format!("Unable to build state caches: {:?}", e)))?;
let head_state = beacon_chain
.speculative_state()
.expect("This is legacy code and should be removed.");
// Parse and check query parameters
let query = UrlQuery::from_request(&req)?;
let current_epoch = head_state.current_epoch();
let epoch = match query.first_of(&["epoch"]) {
Ok((_, v)) => Epoch::new(v.parse::<u64>().map_err(|e| {
ApiError::InvalidQueryParams(format!("Invalid epoch parameter, must be a u64. {:?}", e))
})?),
Err(_) => {
// epoch not supplied, use the current epoch
current_epoch
}
};
let relative_epoch = RelativeEpoch::from_epoch(current_epoch, epoch).map_err(|e| {
ApiError::InvalidQueryParams(format!(
"Cannot get RelativeEpoch, epoch out of range: {:?}",
e
))
})?;
//TODO: Handle an array of validators, currently only takes one
let mut validators: Vec<PublicKey> = match query.all_of("validator_pubkeys") {
Ok(v) => v
.iter()
.map(|pk| parse_pubkey(pk))
.collect::<Result<Vec<_>, _>>()?,
Err(e) => {
return Err(e);
}
};
let mut duties: Vec<ValidatorDuty> = Vec::new();
// Get a list of all validators for this epoch
let validator_proposers: Vec<usize> = epoch
.slot_iter(T::EthSpec::slots_per_epoch())
.map(|slot| {
head_state
.get_beacon_proposer_index(slot, relative_epoch, &beacon_chain.spec)
.map_err(|e| {
ApiError::ServerError(format!(
"Unable to get proposer index for validator: {:?}",
e
))
})
})
.collect::<Result<Vec<usize>, _>>()?;
// Look up duties for each validator
for val_pk in validators {
let mut duty = ValidatorDuty::new();
duty.validator_pubkey = val_pk.as_hex_string();
// Get the validator index
// If it does not exist in the index, just add a null duty and move on.
let val_index: usize = match head_state.get_validator_index(&val_pk) {
Ok(Some(i)) => i,
Ok(None) => {
duties.append(&mut vec![duty]);
continue;
}
Err(e) => {
return Err(ApiError::ServerError(format!(
"Unable to read validator index cache. {:?}",
e
)));
}
};
// Set attestation duties
match head_state.get_attestation_duties(val_index, relative_epoch) {
Ok(Some(d)) => {
duty.attestation_slot = Some(d.slot);
duty.attestation_shard = Some(d.shard);
}
Ok(None) => {}
Err(e) => {
return Err(ApiError::ServerError(format!(
"unable to read cache for attestation duties: {:?}",
e
)))
}
};
// If the validator is to propose a block, identify the slot
if let Some(slot) = validator_proposers.iter().position(|&v| val_index == v) {
duty.block_proposal_slot = Some(Slot::new(
relative_epoch
.into_epoch(current_epoch)
.start_slot(T::EthSpec::slots_per_epoch())
.as_u64()
+ slot as u64,
));
}
duties.append(&mut vec![duty]);
}
let body = Body::from(
serde_json::to_string(&duties)
.expect("We should always be able to serialize the duties we created."),
);
Ok(success_response(body))
}

7
eth2/utils/bls/src/fake_public_key.rs
View File

@ -61,6 +61,13 @@ impl FakePublicKey {
hex_encode(end_bytes)
}
/// Returns the point as a hex string of the SSZ encoding.
///
/// Note: the string is prefixed with `0x`.
pub fn as_hex_string(&self) -> String {
hex_encode(self.as_ssz_bytes())
}
// Returns itself
pub fn as_raw(&self) -> &Self {
self

2
eth2/utils/bls/src/public_key.rs
View File

@ -28,7 +28,7 @@ impl PublicKey {
/// Returns the underlying point as compressed bytes.
///
/// Identical to `self.as_uncompressed_bytes()`.
fn as_bytes(&self) -> Vec<u8> {
pub fn as_bytes(&self) -> Vec<u8> {
self.as_raw().as_bytes()
}