Add prater testnet config (#2260)

## Issue Addressed

Resolves #2258 

## Proposed Changes

Add support for prater testnet.

common/eth2_config/src/lib.rs

@@ -123,3 +123,5 @@ define_net!(pyrmont, include_pyrmont_file, "pyrmont", true);
 define_net!(mainnet, include_mainnet_file, "mainnet", true);
 
 define_net!(toledo, include_toledo_file, "toledo", true);
+
+define_net!(prater, include_prater_file, "prater", true);

common/eth2_network_config/build.rs

@@ -1,6 +1,6 @@
 //! Extracts zipped genesis states on first run.
 use eth2_config::{
-    altona, mainnet, medalla, pyrmont, spadina, toledo, Eth2NetArchiveAndDirectory,
+    altona, mainnet, medalla, prater, pyrmont, spadina, toledo, Eth2NetArchiveAndDirectory,
     GENESIS_FILE_NAME,
 };
 use std::fs::File;
@@ -14,6 +14,7 @@ const ETH2_NET_DIRS: &[Eth2NetArchiveAndDirectory<'static>] = &[
     mainnet::ETH2_NET_DIR,
     pyrmont::ETH2_NET_DIR,
     toledo::ETH2_NET_DIR,
+    prater::ETH2_NET_DIR,
 ];
 
 fn main() {

common/eth2_network_config/built_in_network_configs/prater/boot_enr.yaml

@@ -0,0 +1 @@
+[]

common/eth2_network_config/built_in_network_configs/prater/config.yaml

@@ -0,0 +1,155 @@
+# Prater preset
+
+CONFIG_NAME: "prater"
+
+# Misc
+# ---------------------------------------------------------------
+# 2**6 (= 64)
+MAX_COMMITTEES_PER_SLOT: 64
+# 2**7 (= 128)
+TARGET_COMMITTEE_SIZE: 128
+# 2**11 (= 2,048)
+MAX_VALIDATORS_PER_COMMITTEE: 2048
+# 2**2 (= 4)
+MIN_PER_EPOCH_CHURN_LIMIT: 4
+# 2**16 (= 65,536)
+CHURN_LIMIT_QUOTIENT: 65536
+# See issue 563
+SHUFFLE_ROUND_COUNT: 90
+# `2**14` (= 16,384)
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 16384
+# Mar-01-2021 08:53:32 AM +UTC
+MIN_GENESIS_TIME: 1614588812
+# 4
+HYSTERESIS_QUOTIENT: 4
+# 1 (minus 0.25)
+HYSTERESIS_DOWNWARD_MULTIPLIER: 1
+# 5 (plus 1.25)
+HYSTERESIS_UPWARD_MULTIPLIER: 5
+
+
+# Fork Choice
+# ---------------------------------------------------------------
+# 2**3 (= 8)
+SAFE_SLOTS_TO_UPDATE_JUSTIFIED: 8
+
+
+# Validator
+# ---------------------------------------------------------------
+# 2**11 (= 2,048)
+ETH1_FOLLOW_DISTANCE: 2048
+# 2**4 (= 16)
+TARGET_AGGREGATORS_PER_COMMITTEE: 16
+# 2**0 (= 1)
+RANDOM_SUBNETS_PER_VALIDATOR: 1
+# 2**8 (= 256)
+EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION: 256
+# 14 (estimate from Eth1 mainnet)
+SECONDS_PER_ETH1_BLOCK: 14
+
+
+# Deposit contract
+# ---------------------------------------------------------------
+# Ethereum Goerli testnet
+DEPOSIT_CHAIN_ID: 5
+DEPOSIT_NETWORK_ID: 5
+# Prater test deposit contract on Goerli Testnet
+DEPOSIT_CONTRACT_ADDRESS: 0xff50ed3d0ec03aC01D4C79aAd74928BFF48a7b2b
+
+
+# Gwei values
+# ---------------------------------------------------------------
+# 2**0 * 10**9 (= 1,000,000,000) Gwei
+MIN_DEPOSIT_AMOUNT: 1000000000
+# 2**5 * 10**9 (= 32,000,000,000) Gwei
+MAX_EFFECTIVE_BALANCE: 32000000000
+# 2**4 * 10**9 (= 16,000,000,000) Gwei
+EJECTION_BALANCE: 16000000000
+# 2**0 * 10**9 (= 1,000,000,000) Gwei
+EFFECTIVE_BALANCE_INCREMENT: 1000000000
+
+
+# Initial values
+# ---------------------------------------------------------------
+# Prater area code (Vienna)
+GENESIS_FORK_VERSION: 0x00001020
+BLS_WITHDRAWAL_PREFIX: 0x00
+
+
+# Time parameters
+# ---------------------------------------------------------------
+# Customized for Prater: 1919188 seconds (Mar-23-2021 02:00:00 PM +UTC)
+GENESIS_DELAY: 1919188
+# 12 seconds
+SECONDS_PER_SLOT: 12
+# 2**0 (= 1) slots 12 seconds
+MIN_ATTESTATION_INCLUSION_DELAY: 1
+# 2**5 (= 32) slots 6.4 minutes
+SLOTS_PER_EPOCH: 32
+# 2**0 (= 1) epochs 6.4 minutes
+MIN_SEED_LOOKAHEAD: 1
+# 2**2 (= 4) epochs 25.6 minutes
+MAX_SEED_LOOKAHEAD: 4
+# 2**6 (= 64) epochs ~6.8 hours
+EPOCHS_PER_ETH1_VOTING_PERIOD: 64
+# 2**13 (= 8,192) slots ~13 hours
+SLOTS_PER_HISTORICAL_ROOT: 8192
+# 2**8 (= 256) epochs ~27 hours
+MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+# 2**8 (= 256) epochs ~27 hours
+SHARD_COMMITTEE_PERIOD: 256
+# 2**2 (= 4) epochs 25.6 minutes
+MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
+
+
+# State vector lengths
+# ---------------------------------------------------------------
+# 2**16 (= 65,536) epochs ~0.8 years
+EPOCHS_PER_HISTORICAL_VECTOR: 65536
+# 2**13 (= 8,192) epochs ~36 days
+EPOCHS_PER_SLASHINGS_VECTOR: 8192
+# 2**24 (= 16,777,216) historical roots, ~26,131 years
+HISTORICAL_ROOTS_LIMIT: 16777216
+# 2**40 (= 1,099,511,627,776) validator spots
+VALIDATOR_REGISTRY_LIMIT: 1099511627776
+
+
+# Reward and penalty quotients
+# ---------------------------------------------------------------
+# 2**6 (= 64)
+BASE_REWARD_FACTOR: 64
+# 2**9 (= 512)
+WHISTLEBLOWER_REWARD_QUOTIENT: 512
+# 2**3 (= 8)
+PROPOSER_REWARD_QUOTIENT: 8
+# 2**26 (= 67,108,864)
+INACTIVITY_PENALTY_QUOTIENT: 67108864
+# 2**7 (= 128) (lower safety margin at Phase 0 genesis)
+MIN_SLASHING_PENALTY_QUOTIENT: 128
+# 1 (lower safety margin at Phase 0 genesis)
+PROPORTIONAL_SLASHING_MULTIPLIER: 1
+
+
+# Max operations per block
+# ---------------------------------------------------------------
+# 2**4 (= 16)
+MAX_PROPOSER_SLASHINGS: 16
+# 2**1 (= 2)
+MAX_ATTESTER_SLASHINGS: 2
+# 2**7 (= 128)
+MAX_ATTESTATIONS: 128
+# 2**4 (= 16)
+MAX_DEPOSITS: 16
+# 2**4 (= 16)
+MAX_VOLUNTARY_EXITS: 16
+
+
+# Signature domains
+# ---------------------------------------------------------------
+DOMAIN_BEACON_PROPOSER: 0x00000000
+DOMAIN_BEACON_ATTESTER: 0x01000000
+DOMAIN_RANDAO: 0x02000000
+DOMAIN_DEPOSIT: 0x03000000
+DOMAIN_VOLUNTARY_EXIT: 0x04000000
+DOMAIN_SELECTION_PROOF: 0x05000000
+DOMAIN_AGGREGATE_AND_PROOF: 0x06000000

common/eth2_network_config/built_in_network_configs/prater/deploy_block.txt

@@ -0,0 +1 @@
+4367322

common/eth2_network_config/src/lib.rs

@@ -44,8 +44,10 @@ const SPADINA: HardcodedNet = define_net!(spadina, include_spadina_file);
 const PYRMONT: HardcodedNet = define_net!(pyrmont, include_pyrmont_file);
 const MAINNET: HardcodedNet = define_net!(mainnet, include_mainnet_file);
 const TOLEDO: HardcodedNet = define_net!(toledo, include_toledo_file);
+const PRATER: HardcodedNet = define_net!(prater, include_prater_file);
 
-const HARDCODED_NETS: &[HardcodedNet] = &[ALTONA, MEDALLA, SPADINA, PYRMONT, MAINNET, TOLEDO];
+const HARDCODED_NETS: &[HardcodedNet] =
+    &[ALTONA, MEDALLA, SPADINA, PYRMONT, MAINNET, TOLEDO, PRATER];
 pub const DEFAULT_HARDCODED_NETWORK: &str = "mainnet";
 
 /// Specifies an Eth2 network.
@@ -250,7 +252,11 @@ mod tests {
             let config = Eth2NetworkConfig::from_hardcoded_net(net)
                 .unwrap_or_else(|_| panic!("{:?}", net.name));
 
-            if net.name == "mainnet" || net.name == "toledo" || net.name == "pyrmont" {
+            if net.name == "mainnet"
+                || net.name == "toledo"
+                || net.name == "pyrmont"
+                || net.name == "prater"
+            {
                 // Ensure we can parse the YAML config to a chain spec.
                 config
                     .yaml_config

consensus/types/src/chain_spec.rs

@@ -595,6 +595,7 @@ impl YamlConfig {
             "mainnet" => EthSpecId::Mainnet,
             "minimal" => EthSpecId::Minimal,
             "toledo" => EthSpecId::Mainnet,
+            "prater" => EthSpecId::Mainnet,
             "pyrmont" => EthSpecId::Mainnet,
             "spadina" => EthSpecId::V012Legacy,
             "medalla" => EthSpecId::V012Legacy,

lighthouse/src/main.rs

@@ -119,7 +119,7 @@ fn main() {
                 .long("network")
                 .value_name("network")
                 .help("Name of the Eth2 chain Lighthouse will sync and follow.")
-                .possible_values(&["medalla", "altona", "spadina", "pyrmont", "mainnet", "toledo"])
+                .possible_values(&["medalla", "altona", "spadina", "pyrmont", "mainnet", "toledo", "prater"])
                 .conflicts_with("testnet-dir")
                 .takes_value(true)
                 .global(true)