Introduce constant presets (#269)

* Initial move constants to mainnet preset

* Bump fixtures to include shuffling with minimal preset

* Add minimal preset with shuffling test

* Add minimal preset to the full test suite

* use preset() everywhere

beacon_chain.nimble

@@ -44,4 +44,7 @@ proc buildBinary(name: string, srcDir = "./", params = "", lang = "c") =
 
 ### tasks
 task test, "Run all tests":
+  # Mainnet config
   buildBinary "all_tests", "tests/", "-r -d:release -d:chronicles_log_level=ERROR"
+  # Minimal config
+  buildBinary "all_tests", "tests/", "-r -d:release -d:chronicles_log_level=ERROR -d:const_preset=minimal"

beacon_chain/spec/datatypes.nim

@@ -38,12 +38,19 @@ import
 # Eventually, we could also differentiate between user/tainted data and
 # internal state that's gone through sanity checks already.
 
-# TODO Many of these constants should go into a config object that can be used
-#      to run.. well.. a chain with different constants!
 
-type
+# Constant presets
-  Slot* = distinct uint64
+# https://github.com/ethereum/eth2.0-specs/blob/v0.6.1/configs/constant_presets/
-  Epoch* = distinct uint64
+const const_preset*{.strdefine.} = "mainnet"
+
+when const_preset == "mainnet":
+  import ./presets/mainnet
+  export mainnet
+elif const_preset == "minimal":
+  import ./presets/minimal
+  export minimal
+else:
+  {.fatal: "Preset \"" & const_preset ".nim\" is not supported.".}
 
 const
   SPEC_VERSION* = "0.5.1" ## \
@@ -51,142 +58,27 @@ const
   ## TODO: improve this scheme once we can negotiate versions in protocol
 
   # Misc
+  # ---------------------------------------------------------------
   # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#misc
-  SHARD_COUNT* {.intdefine.} = 1024 ##\
-  ## Number of shards supported by the network - validators will jump around
-  ## between these shards and provide attestations to their state.
-  ## Compile with -d:SHARD_COUNT=4 for fewer shard (= better with low validator counts)
-
-  TARGET_COMMITTEE_SIZE* = 2^7 ##\
-  ## Number of validators in the committee attesting to one shard
-  ## Per spec:
-  ## For the safety of crosslinks `TARGET_COMMITTEE_SIZE` exceeds
-  ## [the recommended minimum committee size of 111](https://vitalik.ca/files/Ithaca201807_Sharding.pdf);
-  ## with sufficient active validators (at least
-  ## `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures
-  ## committee sizes at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness
-  ## with a Verifiable Delay Function (VDF) will improve committee robustness
-  ## and lower the safe minimum committee size.)
 
   # TODO remove, not in post-0.5.1
   MAX_BALANCE_CHURN_QUOTIENT* = 2^5 ##\
 
-  MAX_INDICES_PER_ATTESTATION* = 2^12 ##\
-  ## votes
-
-  MIN_PER_EPOCH_CHURN_LIMIT* = 4
-
-  CHURN_LIMIT_QUOTIENT* = 2^16
-
-  BASE_REWARDS_PER_EPOCH* = 5
-
-  SHUFFLE_ROUND_COUNT* = 90
-
-  # Deposit contract
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#deposit-contract
-  DEPOSIT_CONTRACT_TREE_DEPTH* = 32
-
   # Gwei values
+  # ---------------------------------------------------------------
   # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#gwei-values
-  MIN_DEPOSIT_AMOUNT* = 2'u64^0 * 10'u64^9 ##\
-  ## Minimum amounth of ETH that can be deposited in one call - deposits can
-  ## be used either to top up an existing validator or commit to a new one
-
-  MAX_EFFECTIVE_BALANCE* = 2'u64^5 * 10'u64^9 ##\
-  ## Maximum amounth of ETH that can be deposited in one call
 
   # TODO remove erstwhile blob/v0.5.0
   FORK_CHOICE_BALANCE_INCREMENT* = 2'u64^0 * 10'u64^9
 
-  EJECTION_BALANCE* = 2'u64^4 * 10'u64^9 ##\
+  # Initial values
-  ## Once the balance of a validator drops below this, it will be ejected from
+  # ---------------------------------------------------------------
-  ## the validator pool
-
-  EFFECTIVE_BALANCE_INCREMENT* = 2'u64^0 * 10'u64^9
-
-  # Time parameter, here so that GENESIS_EPOCH can access it
-  # TODO re-merge
-  SLOTS_PER_EPOCH* {.intdefine.} = 64 ##\
-  ## (~6.4 minutes)
-  ## slots that make up an epoch, at the end of which more heavy
-  ## processing is done
-  ## Compile with -d:SLOTS_PER_EPOCH=4 for shorter epochs
-
   # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#initial-values
-  # TODO: in 0.5.0, GENESIS_FORK_VERSION defined as int, but used as [byte]
-  GENESIS_FORK_VERSION* = [0'u8, 0'u8, 0'u8, 0'u8]
-  GENESIS_SLOT* = (2'u64^32).Slot
   GENESIS_EPOCH* = (GENESIS_SLOT.uint64 div SLOTS_PER_EPOCH).Epoch ##\
   ## slot_to_epoch(GENESIS_SLOT)
   GENESIS_START_SHARD* = 0'u64
-  FAR_FUTURE_EPOCH* = (not 0'u64).Epoch # 2^64 - 1 in spec
   ZERO_HASH* = Eth2Digest()
   EMPTY_SIGNATURE* = ValidatorSig()
-  BLS_WITHDRAWAL_PREFIX_BYTE* = 0'u8
-
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.1/specs/core/0_fork-choice.md#time-parameters
-  SECONDS_PER_SLOT*{.intdefine.} = 6'u64 # Compile with -d:SECONDS_PER_SLOT=1 for 6x faster slots
-  ## TODO consistent time unit across projects, similar to C++ chrono?
-
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.1/specs/core/0_beacon-chain.md#time-parameters
-  MIN_ATTESTATION_INCLUSION_DELAY* = 2'u64^2 ##\
-  ## (24 seconds)
-  ## Number of slots that attestations stay in the attestation
-  ## pool before being added to a block.
-  ## The attestation delay exists so that there is time for attestations to
-  ## propagate before the block is created.
-  ## When creating an attestation, the validator will look at the best
-  ## information known to at that time, and may not revise it during the same
-  ## slot (see `is_double_vote`) - the delay gives the validator a chance to
-  ## wait towards the end of the slot and still have time to publish the
-  ## attestation.
-
-  # SLOTS_PER_EPOCH is defined above.
-  # TODO it doesn't need to be anymore
-
-  MIN_SEED_LOOKAHEAD* = 1 ##\
-  ## epochs (~6.4 minutes)
-
-  ACTIVATION_EXIT_DELAY* = 4 ##\
-  ## epochs (~25.6 minutes)
-
-  SLOTS_PER_ETH1_VOTING_PERIOD* = 1024 ##\
-  ## slots (~1.7 hours)
-
-  SLOTS_PER_HISTORICAL_ROOT* = 8192 ##\
-  ## slots (13 hours)
-
-  MIN_VALIDATOR_WITHDRAWABILITY_DELAY* = 2'u64^8 ##\
-  ## epochs (~27 hours)
-
-  PERSISTENT_COMMITTEE_PERIOD* = 2'u64^11 ##\
-  ## epochs (9 days)
-
-  MAX_CROSSLINK_EPOCHS* = 2'u64^6 ##\
-  ## epochs (~7 hours)
-
-  MIN_EPOCHS_TO_INACTIVITY_PENALTY* = 2'u64^2 ##\
-  ## epochs (25.6 minutes)
-
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#state-list-lengths
-  LATEST_RANDAO_MIXES_LENGTH* = 8192
-  LATEST_ACTIVE_INDEX_ROOTS_LENGTH* = 8192 # 2'u64^13, epochs
-  LATEST_SLASHED_EXIT_LENGTH* = 8192 # epochs
-
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#reward-and-penalty-quotients
-  BASE_REWARD_QUOTIENT* = 2'u64^5
-  WHISTLEBLOWER_REWARD_QUOTIENT* = 2'u64^9
-  PROPOSER_REWARD_QUOTIENT* = 2'u64^3
-  INACTIVITY_PENALTY_QUOTIENT* = 2'u64^25
-  MIN_PENALTY_QUOTIENT* = 32 # 2^5
-
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#max-operations-per-block
-  MAX_PROPOSER_SLASHINGS* = 2^4
-  MAX_ATTESTER_SLASHINGS* = 2^0
-  MAX_ATTESTATIONS* = 2^7
-  MAX_DEPOSITS* = 2^4
-  MAX_VOLUNTARY_EXITS* = 2^4
-  MAX_TRANSFERS* = 0
 
 type
   ValidatorIndex* = range[0'u32 .. 0xFFFFFF'u32] # TODO: wrap-around
@@ -512,15 +404,6 @@ type
     Activation = 0
     Exit = 1
 
-  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#signature-domains
-  SignatureDomain* {.pure.} = enum
-    DOMAIN_BEACON_PROPOSER = 0
-    DOMAIN_RANDAO = 1
-    DOMAIN_ATTESTATION = 2
-    DOMAIN_DEPOSIT = 3
-    DOMAIN_VOLUNTARY_EXIT = 4
-    DOMAIN_TRANSFER = 5
-
   # TODO: not in spec
   CrosslinkCommittee* = tuple[committee: seq[ValidatorIndex], shard: uint64]
 
@@ -629,4 +512,3 @@ chronicles.formatIt AttestationData: it.shortLog
 import nimcrypto, json_serialization
 export json_serialization
 export writeValue, readValue, append, read
-

beacon_chain/spec/presets/mainnet.nim

@@ -0,0 +1,178 @@
+# beacon_chain
+# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+# This file contains constants that are part of the spec and thus subject to
+# serialization and spec updates.
+
+import
+  # Standard library
+  math,
+  # Third-party
+  eth/common,
+  # Internals
+  ../crypto, ../digest
+
+type
+  Slot* = distinct uint64
+  Epoch* = distinct uint64
+
+{.experimental: "codeReordering".} # SLOTS_PER_EPOCH is use before being defined in spec
+
+# https://github.com/ethereum/eth2.0-specs/blob/v0.6.1/configs/constant_presets/mainnet.yaml
+const
+  # Misc
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#misc
+
+  SHARD_COUNT* {.intdefine.} = 1024 ##\
+  ## Number of shards supported by the network - validators will jump around
+  ## between these shards and provide attestations to their state.
+  ## Compile with -d:SHARD_COUNT=4 for fewer shard (= better with low validator counts)
+
+  TARGET_COMMITTEE_SIZE* = 2^7 ##\
+  ## Number of validators in the committee attesting to one shard
+  ## Per spec:
+  ## For the safety of crosslinks `TARGET_COMMITTEE_SIZE` exceeds
+  ## [the recommended minimum committee size of 111](https://vitalik.ca/files/Ithaca201807_Sharding.pdf);
+  ## with sufficient active validators (at least
+  ## `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures
+  ## committee sizes at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness
+  ## with a Verifiable Delay Function (VDF) will improve committee robustness
+  ## and lower the safe minimum committee size.)
+
+  MAX_INDICES_PER_ATTESTATION* = 2^12 ##\
+  ## votes
+
+  MIN_PER_EPOCH_CHURN_LIMIT* = 4
+
+  CHURN_LIMIT_QUOTIENT* = 2^16
+
+  BASE_REWARDS_PER_EPOCH* = 5
+
+  SHUFFLE_ROUND_COUNT* = 90
+
+  # Deposit contract
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#deposit-contract
+
+  DEPOSIT_CONTRACT_ADDRESS = "0x1234567890123456789012345678901234567890"
+    # TODO
+
+  DEPOSIT_CONTRACT_TREE_DEPTH* = 32
+
+  # Gwei values
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#gwei-values
+
+  MIN_DEPOSIT_AMOUNT* = 2'u64^0 * 10'u64^9 ##\
+  ## Minimum amounth of ETH that can be deposited in one call - deposits can
+  ## be used either to top up an existing validator or commit to a new one
+
+  MAX_EFFECTIVE_BALANCE* = 2'u64^5 * 10'u64^9 ##\
+  ## Maximum amounth of ETH that can be deposited in one call
+
+  EJECTION_BALANCE* = 2'u64^4 * 10'u64^9 ##\
+  ## Once the balance of a validator drops below this, it will be ejected from
+  ## the validator pool
+
+  EFFECTIVE_BALANCE_INCREMENT* = 2'u64^0 * 10'u64^9
+
+  # Initial values
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#initial-values
+
+  GENESIS_FORK_VERSION* = [0'u8, 0'u8, 0'u8, 0'u8]
+  GENESIS_SLOT* = (2'u64^32).Slot
+  FAR_FUTURE_EPOCH* = (not 0'u64).Epoch # 2^64 - 1 in spec
+  BLS_WITHDRAWAL_PREFIX_BYTE* = 0'u8
+
+  # Time parameters
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.1/specs/core/0_fork-choice.md#time-parameters
+
+  SECONDS_PER_SLOT*{.intdefine.} = 6'u64 # Compile with -d:SECONDS_PER_SLOT=1 for 6x faster slots
+  ## TODO consistent time unit across projects, similar to C++ chrono?
+
+  MIN_ATTESTATION_INCLUSION_DELAY* = 2'u64^2 ##\
+  ## (24 seconds)
+  ## Number of slots that attestations stay in the attestation
+  ## pool before being added to a block.
+  ## The attestation delay exists so that there is time for attestations to
+  ## propagate before the block is created.
+  ## When creating an attestation, the validator will look at the best
+  ## information known to at that time, and may not revise it during the same
+  ## slot (see `is_double_vote`) - the delay gives the validator a chance to
+  ## wait towards the end of the slot and still have time to publish the
+  ## attestation.
+
+  SLOTS_PER_EPOCH* {.intdefine.} = 64 ##\
+  ## (~6.4 minutes)
+  ## slots that make up an epoch, at the end of which more heavy
+  ## processing is done
+  ## Compile with -d:SLOTS_PER_EPOCH=4 for shorter epochs
+
+  MIN_SEED_LOOKAHEAD* = 1 ##\
+  ## epochs (~6.4 minutes)
+
+  ACTIVATION_EXIT_DELAY* = 4 ##\
+  ## epochs (~25.6 minutes)
+
+  SLOTS_PER_ETH1_VOTING_PERIOD* = 1024 ##\
+  ## slots (~1.7 hours)
+
+  SLOTS_PER_HISTORICAL_ROOT* = 8192 ##\
+  ## slots (13 hours)
+
+  MIN_VALIDATOR_WITHDRAWABILITY_DELAY* = 2'u64^8 ##\
+  ## epochs (~27 hours)
+
+  PERSISTENT_COMMITTEE_PERIOD* = 2'u64^11 ##\
+  ## epochs (9 days)
+
+  MAX_CROSSLINK_EPOCHS* = 2'u64^6 ##\
+  ## epochs (~7 hours)
+
+  MIN_EPOCHS_TO_INACTIVITY_PENALTY* = 2'u64^2 ##\
+  ## epochs (25.6 minutes)
+
+  # State list lengths
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#state-list-lengths
+  LATEST_RANDAO_MIXES_LENGTH* = 8192
+  LATEST_ACTIVE_INDEX_ROOTS_LENGTH* = 8192 # 2'u64^13, epochs
+  LATEST_SLASHED_EXIT_LENGTH* = 8192 # epochs
+
+  # Reward and penalty quotients
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#reward-and-penalty-quotients
+  BASE_REWARD_QUOTIENT* = 2'u64^5
+  WHISTLEBLOWER_REWARD_QUOTIENT* = 2'u64^9
+  PROPOSER_REWARD_QUOTIENT* = 2'u64^3
+  INACTIVITY_PENALTY_QUOTIENT* = 2'u64^25
+  MIN_PENALTY_QUOTIENT* = 32 # 2^5
+
+  # Max operations per block
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#max-operations-per-block
+  MAX_PROPOSER_SLASHINGS* = 2^4
+  MAX_ATTESTER_SLASHINGS* = 2^0
+  MAX_ATTESTATIONS* = 2^7
+  MAX_DEPOSITS* = 2^4
+  MAX_VOLUNTARY_EXITS* = 2^4
+  MAX_TRANSFERS* = 0
+
+type
+  # Signature domains
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#signature-domains
+  SignatureDomain* {.pure.} = enum
+    DOMAIN_BEACON_PROPOSER = 0
+    DOMAIN_RANDAO = 1
+    DOMAIN_ATTESTATION = 2
+    DOMAIN_DEPOSIT = 3
+    DOMAIN_VOLUNTARY_EXIT = 4
+    DOMAIN_TRANSFER = 5

beacon_chain/spec/presets/minimal.nim

@@ -0,0 +1,139 @@
+# beacon_chain
+# Copyright (c) 2018-2019 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+# This file contains constants that are part of the spec and thus subject to
+# serialization and spec updates.
+
+import
+  # Standard library
+  math,
+  # Third-party
+  eth/common,
+  # Internals
+  ../crypto, ../digest
+
+type
+  Slot* = distinct uint64
+  Epoch* = distinct uint64
+
+{.experimental: "codeReordering".} # SLOTS_PER_EPOCH is use before being defined in spec
+
+# https://github.com/ethereum/eth2.0-specs/blob/v0.6.1/configs/constant_presets/minimal.yaml
+const
+  # Misc
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#misc
+
+  # Changed
+  SHARD_COUNT* {.intdefine.} = 8
+  TARGET_COMMITTEE_SIZE* = 4
+
+  # Unchanged
+  MAX_INDICES_PER_ATTESTATION* = 4096
+  MIN_PER_EPOCH_CHURN_LIMIT* = 4
+  CHURN_LIMIT_QUOTIENT* = 2^16
+  BASE_REWARDS_PER_EPOCH* = 5
+
+  # Changed
+  SHUFFLE_ROUND_COUNT* = 10
+
+  # Deposit contract
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#deposit-contract
+
+  # Unchanged
+  DEPOSIT_CONTRACT_ADDRESS = "0x1234567890123456789012345678901234567890"
+  DEPOSIT_CONTRACT_TREE_DEPTH* = 32
+
+  # Gwei values
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#gwei-values
+
+  # Unchanged
+  MIN_DEPOSIT_AMOUNT* = 2'u64^0 * 10'u64^9
+  MAX_EFFECTIVE_BALANCE* = 2'u64^5 * 10'u64^9
+  EJECTION_BALANCE* = 2'u64^4 * 10'u64^9
+  EFFECTIVE_BALANCE_INCREMENT* = 2'u64^0 * 10'u64^9
+
+  # Initial values
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.5.0/specs/core/0_beacon-chain.md#initial-values
+
+  # Unchanged
+  GENESIS_FORK_VERSION* = [0'u8, 0'u8, 0'u8, 0'u8]
+  GENESIS_SLOT* = (2'u64^32).Slot
+  FAR_FUTURE_EPOCH* = (not 0'u64).Epoch # 2^64 - 1 in spec
+  BLS_WITHDRAWAL_PREFIX_BYTE* = 0'u8
+
+  # Time parameters
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.1/specs/core/0_fork-choice.md#time-parameters
+
+  # Unchanged
+  SECONDS_PER_SLOT*{.intdefine.} = 6'u64
+  MIN_ATTESTATION_INCLUSION_DELAY* = 2'u64^2
+
+  # Changed
+  SLOTS_PER_EPOCH* {.intdefine.} = 64
+
+  # Unchanged
+  MIN_SEED_LOOKAHEAD* = 1
+  ACTIVATION_EXIT_DELAY* = 4
+
+  # Changed
+  SLOTS_PER_ETH1_VOTING_PERIOD* = 16
+  SLOTS_PER_HISTORICAL_ROOT* = 64
+
+  # Unchanged
+  MIN_VALIDATOR_WITHDRAWABILITY_DELAY* = 2'u64^8
+  PERSISTENT_COMMITTEE_PERIOD* = 2'u64^11
+  MAX_CROSSLINK_EPOCHS* = 2'u64^6
+  MIN_EPOCHS_TO_INACTIVITY_PENALTY* = 2'u64^2
+
+  # State list lengths
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#state-list-lengths
+
+  # Changed
+  LATEST_RANDAO_MIXES_LENGTH* = 64
+  LATEST_ACTIVE_INDEX_ROOTS_LENGTH* = 64
+  LATEST_SLASHED_EXIT_LENGTH* = 64
+
+  # Reward and penalty quotients
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#reward-and-penalty-quotients
+
+  # Unchanged
+  BASE_REWARD_QUOTIENT* = 2'u64^5
+  WHISTLEBLOWER_REWARD_QUOTIENT* = 2'u64^9
+  PROPOSER_REWARD_QUOTIENT* = 2'u64^3
+  INACTIVITY_PENALTY_QUOTIENT* = 2'u64^25
+  MIN_PENALTY_QUOTIENT* = 32 # 2^5
+
+  # Max operations per block
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#max-operations-per-block
+
+  # Unchanged
+  MAX_PROPOSER_SLASHINGS* = 2^4
+  MAX_ATTESTER_SLASHINGS* = 2^0
+  MAX_ATTESTATIONS* = 2^7
+  MAX_DEPOSITS* = 2^4
+  MAX_VOLUNTARY_EXITS* = 2^4
+  MAX_TRANSFERS* = 0
+
+type
+  # Signature domains
+  # ---------------------------------------------------------------
+  # https://github.com/ethereum/eth2.0-specs/blob/v0.6.0/specs/core/0_beacon-chain.md#signature-domains
+  SignatureDomain* {.pure.} = enum
+    DOMAIN_BEACON_PROPOSER = 0
+    DOMAIN_RANDAO = 1
+    DOMAIN_ATTESTATION = 2
+    DOMAIN_DEPOSIT = 3
+    DOMAIN_VOLUNTARY_EXIT = 4
+    DOMAIN_TRANSFER = 5

tests/official/fixtures

@@ -1 +1 @@
-Subproject commit 76fd020646fef404c55837fbc40833b0d0b2ac72
+Subproject commit fa7ebca4cbe5a9d5dce3114daa977427adc1892c

tests/official/test_fixture_shuffling.nim

@@ -6,25 +6,30 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 import
-  # Standard libs
+  # Standard library
   ospaths, strutils, json, unittest,
   # Third parties
 
   # Beacon chain internals
-  ../../beacon_chain/spec/validator,
+  ../../beacon_chain/spec/[datatypes, validator],
   # Test utilities
+  ../testutil,
   ./fixtures_utils
 
 const TestFolder = currentSourcePath.rsplit(DirSep, 1)[0]
+
+when const_preset == "mainnet":
   const TestsPath = "fixtures" / "json_tests" / "shuffling" / "core" / "shuffling_full.json"
+elif const_preset == "minimal":
+  const TestsPath = "fixtures" / "json_tests" / "shuffling" / "core" / "shuffling_minimal.json"
 
 var shufflingTests: Tests[Shuffling]
 
-suite "Official - Shuffling tests":
+suite "Official - Shuffling tests [Preset: " & preset():
-  test "Parsing the official shuffling tests":
+  test "Parsing the official shuffling tests [Preset: " & preset():
     shufflingTests = parseTestsShuffling(TestFolder / TestsPath)
 
-  test "Shuffling a sequence of N validators":
+  test "Shuffling a sequence of N validators" & preset():
     for t in shufflingTests.test_cases:
       let implResult = get_shuffled_seq(t.seed, t.count)
       check: implResult == t.shuffled

tests/test_attestation_pool.nim

@@ -11,7 +11,7 @@ import
   ../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, helpers, validator],
   ../beacon_chain/[beacon_node_types, attestation_pool, block_pool, extras, state_transition, ssz]
 
-suite "Attestation pool processing":
+suite "Attestation pool processing" & preset():
   ## For now just test that we can compile and execute block processing with
   ## mock data.
 
@@ -22,7 +22,7 @@ suite "Attestation pool processing":
         {skipValidation})
     genBlock = get_initial_beacon_block(genState)
 
-  test "Can add and retrieve simple attestation":
+  test "Can add and retrieve simple attestation" & preset():
     var
       blockPool = BlockPool.init(makeTestDB(genState, genBlock))
       pool = AttestationPool.init(blockPool)
@@ -46,7 +46,7 @@ suite "Attestation pool processing":
     # check:
     #   attestations.len == 1
 
-  test "Attestations may arrive in any order":
+  test "Attestations may arrive in any order" & preset():
     var
       blockPool = BlockPool.init(makeTestDB(genState, genBlock))
       pool = AttestationPool.init(blockPool)

tests/test_beacon_chain_db.nim

@@ -7,11 +7,13 @@
 
 import  options, unittest, sequtils, strutils, eth/trie/[db],
   ../beacon_chain/[beacon_chain_db, ssz],
-  ../beacon_chain/spec/[datatypes, digest, crypto]
+  ../beacon_chain/spec/[datatypes, digest, crypto],
+  # test utilies
+  ./testutil
 
-suite "Beacon chain DB":
+suite "Beacon chain DB" & preset():
 
-  test "empty database":
+  test "empty database" & preset():
     var
       db = init(BeaconChainDB, newMemoryDB())
 
@@ -19,7 +21,7 @@ suite "Beacon chain DB":
       db.getState(Eth2Digest()).isNone
       db.getBlock(Eth2Digest()).isNone
 
-  test "sanity check blocks":
+  test "sanity check blocks" & preset():
     var
       db = init(BeaconChainDB, newMemoryDB())
 
@@ -37,7 +39,7 @@ suite "Beacon chain DB":
     check:
       db.getStateRoot(root, blck.slot).get() == root
 
-  test "sanity check states":
+  test "sanity check states" & preset():
     var
       db = init(BeaconChainDB, newMemoryDB())
 
@@ -51,7 +53,7 @@ suite "Beacon chain DB":
       db.containsState(root)
       db.getState(root).get() == state
 
-  test "find ancestors":
+  test "find ancestors" & preset():
     var
       db = init(BeaconChainDB, newMemoryDB())
       x: ValidatorSig

tests/test_beaconstate.nim

@@ -11,8 +11,8 @@ import
   ../beacon_chain/extras,
   ../beacon_chain/spec/[beaconstate, datatypes, digest]
 
-suite "Beacon state":
+suite "Beacon state" & preset():
-  test "Smoke test get_genesis_beacon_state":
+  test "Smoke test get_genesis_beacon_state" & preset():
     let state = get_genesis_beacon_state(
       makeInitialDeposits(SLOTS_PER_EPOCH, {}), 0, Eth1Data(), {})
     check: state.validator_registry.len == SLOTS_PER_EPOCH

tests/test_block_pool.nim

@@ -11,14 +11,14 @@ import
   ../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, helpers, validator],
   ../beacon_chain/[beacon_node_types, block_pool, beacon_chain_db, extras, state_transition, ssz]
 
-suite "Block pool processing":
+suite "Block pool processing" & preset():
   let
     genState = get_genesis_beacon_state(
       makeInitialDeposits(flags = {skipValidation}), 0, Eth1Data(),
         {skipValidation})
     genBlock = get_initial_beacon_block(genState)
 
-  test "loadTailState gets genesis block on first load":
+  test "loadTailState gets genesis block on first load" & preset():
     var
       pool = BlockPool.init(makeTestDB(genState, genBlock))
       state = pool.loadTailState()
@@ -29,7 +29,7 @@ suite "Block pool processing":
       b0.isSome()
       toSeq(pool.blockRootsForSlot(GENESIS_SLOT)) == @[state.blck.root]
 
-  test "Simple block add&get":
+  test "Simple block add&get" & preset():
     var
       pool = BlockPool.init(makeTestDB(genState, genBlock))
       state = pool.loadTailState()
@@ -48,7 +48,7 @@ suite "Block pool processing":
       b1Ref.get().refs.root == b1Root
       hash_tree_root(state.data.data) == state.data.root
 
-  test "Reverse order block add & get":
+  test "Reverse order block add & get" & preset():
     var
       db = makeTestDB(genState, genBlock)
       pool = BlockPool.init(db)

tests/test_state_transition.nim

@@ -11,7 +11,7 @@ import
   ../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, helpers, validator],
   ../beacon_chain/[extras, state_transition, ssz]
 
-suite "Block processing":
+suite "Block processing" & preset():
   ## For now just test that we can compile and execute block processing with
   ## mock data.
 
@@ -23,7 +23,7 @@ suite "Block processing":
     genesisBlock = get_initial_beacon_block(genesisState)
     genesisRoot = signing_root(genesisBlock)
 
-  test "Passes from genesis state, no block":
+  test "Passes from genesis state, no block" & preset():
     var
       state = genesisState
 
@@ -31,7 +31,7 @@ suite "Block processing":
     check:
       state.slot == genesisState.slot + 1
 
-  test "Passes from genesis state, empty block":
+  test "Passes from genesis state, empty block" & preset():
     var
       state = genesisState
       previous_block_root = signing_root(genesisBlock)
@@ -44,7 +44,7 @@ suite "Block processing":
 
       state.slot == genesisState.slot + 1
 
-  test "Passes through epoch update, no block":
+  test "Passes through epoch update, no block" & preset():
     var
       state = genesisState
 
@@ -54,7 +54,7 @@ suite "Block processing":
     check:
       state.slot == genesisState.slot + SLOTS_PER_EPOCH
 
-  test "Passes through epoch update, empty block":
+  test "Passes through epoch update, empty block" & preset():
     var
       state = genesisState
       previous_block_root = genesisRoot
@@ -72,7 +72,7 @@ suite "Block processing":
     check:
       state.slot == genesisState.slot + SLOTS_PER_EPOCH
 
-  test "Attestation gets processed at epoch":
+  test "Attestation gets processed at epoch" & preset():
     var
       state = genesisState
       previous_block_root = genesisRoot

tests/testutil.nim

@@ -13,6 +13,9 @@ import
   ../beacon_chain/spec/[beaconstate, bitfield, crypto, datatypes, digest,
     helpers, validator]
 
+func preset*(): string =
+  " [Preset: " & const_preset & ']'
+
 func makeFakeValidatorPrivKey*(i: int): ValidatorPrivKey =
   var i = i + 1 # 0 does not work, as private key...
   copyMem(result.x[0].addr, i.addr, min(sizeof(result.x), sizeof(i)))
@@ -189,4 +192,3 @@ proc makeTestDB*(tailState: BeaconState, tailBlock: BeaconBlock): BeaconChainDB
 
   result = init(BeaconChainDB, newMemoryDB())
   BlockPool.preInit(result, tailState, tailBlock)
-