Greg/initial state && The Great Refactor

.gitignore

@@ -1,3 +1,3 @@
 .idea/
 node_modules/
-test:ethereum
+test:ethereum

beaconChain/constants/constants.ts

@@ -5,12 +5,15 @@
 // Misc
 export const SHARD_COUNT = 2 ** 10; // 1024 shards
 export const TARGET_COMMITTEE_SIZE = 2 ** 8; // 256 validators
-export const MIN_BALANCE = 2 ** 4; // 16 ETH
+export const EJECTION_BALANCE = 2 ** 4; // 16 ETH
 export const MAX_BALANCE_CHURN_QUOTIENT = 2 ** 5; // 32
 export const GWEI_PER_ETH = 10 ** 9; // 1B Gwei/ETH
 export const BEACON_CHAIN_SHARD_NUMBER = 2 ** 64 - 1;
-export const BLS_WITHDRAWAL_PREFIX_BYTE = 0x00;
 export const MAX_CASPER_VOTES = 2 ** 10; // 1024 votes
+export const LATEST_BLOCK_ROOTS_LENGTH =  2 ** 13; // 8192 block roots
+export const LATEST_RANDAO_MIXES_LENGTH = 2 ** 13; // 8192 randao mixes
+export const LATEST_PENALIZED_EXIT_LENGTH = 2 ** 13; // 8192 epochs
+export const MAX_WITHDRAWALS_PER_EPOCH = 2 ** 2; // 4 withdrawals
 
 // Deposit contract
 export const DEPOSIT_CONTRACT_ADDRESS = "TBD";
@@ -19,29 +22,39 @@ export const MIN_DEPOSIT = 2 ** 0; // 1 ETH
 export const MAX_DEPOSIT = 2 ** 5; // 32 ETH
 
 // Initial values
-export const INITIAL_FORK_VERSION = 0;
-export const INITIAL_SLOT_NUMBER = 0;
+export const GENESIS_FORK_VERSION	= 0;
+export const GENESIS_SLOT = 0;
+export const GENESIS_START_SHARD = 0;
+export const FAR_FUTURE_SLOT = 2 ** 64 - 1;
 export const ZERO_HASH = new Uint8Array(32);
+export const EMPTY_SIGNATURE = [new Uint8Array(48), new Uint8Array(48)]; // [bytes48(0), bytes48(0)]
+export const BLS_WITHDRAWAL_PREFIX_BYTE = new Uint8Array(1);
 
 // Time parameters
 export const SLOT_DURATION = 6; // 6 seconds
 export const MIN_ATTESTATION_INCLUSION_DELAY = 2 ** 2; // 4 slots
 export const EPOCH_LENGTH = 2 ** 6; // 64 slots
-export const MIN_VALIDATOR_REGISTRY_CHANGE_INTERVAL = 2 ** 8; // 256 slots
-export const POW_RECEIPT_ROOT_VOTING_PERIOD = 2 ** 10; // 1024 slots
-export const SHARD_PERSISTENT_COMMITTEE_CHANGE_POERIOD = 2 ** 17; // 131,072 slots
-export const COLLECTIVE_PENALTY_CALCULATION_PERIOD = 2 ** 20; // 1,048,576 slots
-export const ZERO_BALANCE_VALIDATOR_TTL = 2 ** 22; // 4,194,304 slots
+export const SEED_LOOKAHEAD = 2 ** 6; // 64 slots
+export const ENTRY_EXIT_DELAY = 2 ** 8; // 256 slots
+export const DEPOSIT_ROOT_VOTING_PERIOD = 2 ** 10; // 1024 slots
+export const MIN_VALIDATOR_WITHDRAWAL_TIME = 2 ** 14; // 16,384 slots
 
 // Reward and penalty quotients
-export const BASE_REWARD_QUOTIENT = 2 ** 11; // 2048
+export const BASE_REWARD_QUOTIENT = 2 ** 10; // 1024
 export const WHISTLEBLOWER_REWARD_QUOTIENT = 2 ** 9; // 512
 export const INCLUDER_REWARD_QUOTIENT = 2 ** 3; // 8
-export const INACTIVITY_PENALTY_QUOTIENT = 2 ** 34; // 17,179,869,184
+export const INACTIVITY_PENALTY_QUOTIENT = 2 ** 24; // 16,777,216
 
 // Max operations per block
 export const MAX_PROPOSER_SLASHINGS = 2 ** 4; // 16
 export const MAX_CASPER_SLASHINGS = 2 ** 4; // 16
 export const MAX_ATTESTATIONS = 2 ** 7; // 128
 export const MAX_DEPOSITS = 2 ** 4; // 16
 export const MAX_EXITS = 2 ** 4; // 16
+
+// OLD
+// export const MIN_VALIDATOR_REGISTRY_CHANGE_INTERVAL = 2 ** 8; // 256 slots
+// export const POW_RECEIPT_ROOT_VOTING_PERIOD = 2 ** 10; // 1024 slots
+// export const SHARD_PERSISTENT_COMMITTEE_CHANGE_POERIOD = 2 ** 17; // 131,072 slots
+// export const COLLECTIVE_PENALTY_CALCULATION_PERIOD = 2 ** 20; // 1,048,576 slots
+// export const ZERO_BALANCE_VALIDATOR_TTL = 2 ** 22; // 4,194,304 slots

beaconChain/constants/enums.ts

@@ -1,11 +1,8 @@
 // https://github.com/ethereum/eth2.0-specs/blob/master/specs/core/0_beacon-chain.md#constants
 
-enum ValidatorStatusCodes {
-  PENDING_ACTIVATION = 0,
-  ACTIVE = 1,
-  ACTIVE_PENDING_EXIT = 2,
-  EXITED_WITHOUT_PENALTY = 3,
-  EXITED_WITH_PENALTY = 4,
+enum StatusFlags {
+  INTIATED_EXIT = 2 ** 0,
+  WITHDRAWABLE = 2 ** 1,
 }
 
 enum ValidatorRegistryDeltaFlags {
@@ -23,5 +20,5 @@ enum SignatureDomains {
 export {
   SignatureDomains,
   ValidatorRegistryDeltaFlags,
-  ValidatorStatusCodes,
+  StatusFlags,
 };

beaconChain/helpers/array.ts

@@ -0,0 +1,16 @@
+/**
+ * Takes two arrays and combines them, similar to the Array.zip() from Python.
+ * a = [1,2,3] b = [4,5,6]
+ * c = zip(a,b) // [[1,4], [2,5], [3,6]]
+ * NOTE: Lodash would be an alternative, although theres no need *YET* to import lodash for one function.
+ * That being said there is one main caveat: if the arrays are not 1-1 in length it will return undefined
+ * but, this is fine for our use case since validatorBalances and validators must be 1-1 in length.
+ * @param {Array<T>} a
+ * @param {Array<X>} b
+ * @returns {(T | X)[][]}
+ */
+function zip<T, X>(a: T[], b: X[]): Array<Array<T|X>> {
+    return a.map((e, i) => [e, b[i]]);
+}
+
+export { zip };