2022-01-11 10:01:54 +00:00
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# beacon_chain
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2023-01-09 22:44:44 +00:00
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# Copyright (c) 2018-2023 Status Research & Development GmbH
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2022-01-11 10:01:54 +00:00
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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2023-01-20 14:14:37 +00:00
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{.push raises: [].}
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2022-01-11 10:01:54 +00:00
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import
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std/[hashes, typetraits],
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chronicles,
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chronos/timer,
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json_serialization,
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./presets
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export hashes, timer, json_serialization, presets
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# A collection of time units that permeate the spec - common to all of them is
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# that they expressed relative to the genesis of the chain at varying
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# granularities:
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#
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# * BeaconTime - nanoseconds since genesis
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# * Slot - SLOTS_PER_SECOND seconds since genesis
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# * Epoch - EPOCHS_PER_SLOT slots since genesis
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# * SyncCommitteePeriod - EPOCHS_PER_SYNC_COMMITTEE_PERIOD epochs since genesis
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type
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BeaconTime* = object
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## A point in time, relative to the genesis of the chain
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##
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## Implemented as nanoseconds since genesis - negative means before
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## the chain started.
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ns_since_genesis*: int64
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TimeDiff* = object
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nanoseconds*: int64
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## Difference between two points in time with nanosecond granularity
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## Can be negative (unlike timer.Duration)
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const
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# Earlier spec versions had these at a different slot
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GENESIS_SLOT* = Slot(0)
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GENESIS_EPOCH* = Epoch(0) # compute_epoch_at_slot(GENESIS_SLOT)
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#constant
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2022-01-11 10:01:54 +00:00
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INTERVALS_PER_SLOT* = 3
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FAR_FUTURE_BEACON_TIME* = BeaconTime(ns_since_genesis: int64.high())
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2023-07-18 18:55:36 +00:00
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NANOSECONDS_PER_SLOT* = SECONDS_PER_SLOT * 1_000_000_000'u64
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2022-01-11 10:01:54 +00:00
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era: load blocks and states (#3394)
* era: load blocks and states
Era files contain finalized history and can be thought of as an
alternative source for block and state data that allows clients to avoid
syncing this information from the P2P network - the P2P network is then
used to "top up" the client with the most recent data. They can be
freely shared in the community via whatever means (http, torrent, etc)
and serve as a permanent cold store of consensus data (and, after the
merge, execution data) for history buffs and bean counters alike.
This PR gently introduces support for loading blocks and states in two
cases: block requests from rest/p2p and frontfilling when doing
checkpoint sync.
The era files are used as a secondary source if the information is not
found in the database - compared to the database, there are a few key
differences:
* the database stores the block indexed by block root while the era file
indexes by slot - the former is used only in rest, while the latter is
used both by p2p and rest.
* when loading blocks from era files, the root is no longer trivially
available - if it is needed, it must either be computed (slow) or cached
(messy) - the good news is that for p2p requests, it is not needed
* in era files, "framed" snappy encoding is used while in the database
we store unframed snappy - for p2p2 requests, the latter requires
recompression while the former could avoid it
* front-filling is the process of using era files to replace backfilling
- in theory this front-filling could happen from any block and
front-fills with gaps could also be entertained, but our backfilling
algorithm cannot take advantage of this because there's no (simple) way
to tell it to "skip" a range.
* front-filling, as implemented, is a bit slow (10s to load mainnet): we
load the full BeaconState for every era to grab the roots of the blocks
- it would be better to partially load the state - as such, it would
also be good to be able to partially decompress snappy blobs
* lookups from REST via root are served by first looking up a block
summary in the database, then using the slot to load the block data from
the era file - however, there needs to be an option to create the
summary table from era files to fully support historical queries
To test this, `ncli_db` has an era file exporter: the files it creates
should be placed in an `era` folder next to `db` in the data directory.
What's interesting in particular about this setup is that `db` remains
as the source of truth for security purposes - it stores the latest
synced head root which in turn determines where a node "starts" its
consensus participation - the era directory however can be freely shared
between nodes / people without any (significant) security implications,
assuming the era files are consistent / not broken.
There's lots of future improvements to be had:
* we can drop the in-memory `BlockRef` index almost entirely - at this
point, resident memory usage of Nimbus should drop to a cool 500-600 mb
* we could serve era files via REST trivially: this would drop backfill
times to whatever time it takes to download the files - unlike the
current implementation that downloads block by block, downloading an era
at a time almost entirely cuts out request overhead
* we can "reasonably" recreate detailed state history from almost any
point in time, turning an O(slot) process into O(1) effectively - we'll
still need caches and indices to do this with sufficient efficiency for
the rest api, but at least it cuts the whole process down to minutes
instead of hours, for arbitrary points in time
* CI: ignore failures with Nim-1.6 (temporary)
* test fixes
Co-authored-by: Ștefan Talpalaru <stefantalpalaru@yahoo.com>
2022-03-23 08:58:17 +00:00
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template ethTimeUnit*(typ: type) {.dirty.} =
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2023-01-30 19:21:51 +00:00
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func `+`*(x: typ, y: uint64): typ {.borrow.}
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func `-`*(x: typ, y: uint64): typ {.borrow.}
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func `-`*(x: uint64, y: typ): typ {.borrow.}
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# Not closed over type in question (Slot or Epoch)
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func `mod`*(x: typ, y: uint64): uint64 {.borrow.}
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func `div`*(x: typ, y: uint64): uint64 {.borrow.}
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func `div`*(x: uint64, y: typ): uint64 {.borrow.}
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func `-`*(x: typ, y: typ): uint64 {.borrow.}
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2022-12-30 20:36:31 +00:00
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iterator countdown*(a, b: typ, step: Positive = 1): typ =
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# otherwise we use the signed version that breaks at the boundary
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for i in countdown(distinctBase(a), distinctBase(b), step):
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yield typ(i)
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2023-01-30 19:21:51 +00:00
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func `*`*(x: typ, y: uint64): uint64 {.borrow.}
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2023-01-30 19:21:51 +00:00
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func `+=`*(x: var typ, y: typ) {.borrow.}
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func `+=`*(x: var typ, y: uint64) {.borrow.}
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func `-=`*(x: var typ, y: typ) {.borrow.}
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func `-=`*(x: var typ, y: uint64) {.borrow.}
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2022-01-11 10:01:54 +00:00
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# Comparison operators
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func `<`*(x: typ, y: typ): bool {.borrow.}
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func `<`*(x: typ, y: uint64): bool {.borrow.}
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func `<`*(x: uint64, y: typ): bool {.borrow.}
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func `<=`*(x: typ, y: typ): bool {.borrow.}
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func `<=`*(x: typ, y: uint64): bool {.borrow.}
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func `<=`*(x: uint64, y: typ): bool {.borrow.}
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2023-01-30 19:21:51 +00:00
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func `==`*(x: typ, y: typ): bool {.borrow.}
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func `==`*(x: typ, y: uint64): bool {.borrow.}
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func `==`*(x: uint64, y: typ): bool {.borrow.}
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2022-01-11 10:01:54 +00:00
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# Nim integration
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2023-01-30 19:21:51 +00:00
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func `$`*(x: typ): string {.borrow.}
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func hash*(x: typ): Hash {.borrow.}
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template asUInt64*(v: typ): uint64 = distinctBase(v)
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template shortLog*(v: typ): auto = distinctBase(v)
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# Serialization
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2023-08-19 15:11:56 +00:00
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proc writeValue*(writer: var JsonWriter, value: typ) {.raises: [IOError].} =
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writeValue(writer, uint64 value)
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proc readValue*(reader: var JsonReader, value: var typ)
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{.raises: [IOError, SerializationError].} =
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value = typ reader.readValue(uint64)
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ethTimeUnit Slot
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ethTimeUnit Epoch
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ethTimeUnit SyncCommitteePeriod
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template `<`*(a, b: BeaconTime): bool = a.ns_since_genesis < b.ns_since_genesis
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template `<=`*(a, b: BeaconTime): bool = a.ns_since_genesis <= b.ns_since_genesis
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template `<`*(a, b: TimeDiff): bool = a.nanoseconds < b.nanoseconds
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template `<=`*(a, b: TimeDiff): bool = a.nanoseconds <= b.nanoseconds
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template `<`*(a: TimeDiff, b: Duration): bool = a.nanoseconds < b.nanoseconds
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func toSlot*(t: BeaconTime): tuple[afterGenesis: bool, slot: Slot] =
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if t == FAR_FUTURE_BEACON_TIME:
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(true, FAR_FUTURE_SLOT)
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elif t.ns_since_genesis >= 0:
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(true, Slot(uint64(t.ns_since_genesis) div NANOSECONDS_PER_SLOT))
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else:
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(false, Slot(uint64(-t.ns_since_genesis) div NANOSECONDS_PER_SLOT))
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template `+`*(t: BeaconTime, offset: Duration | TimeDiff): BeaconTime =
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BeaconTime(ns_since_genesis: t.ns_since_genesis + offset.nanoseconds)
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template `-`*(t: BeaconTime, offset: Duration | TimeDiff): BeaconTime =
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BeaconTime(ns_since_genesis: t.ns_since_genesis - offset.nanoseconds)
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template `-`*(a, b: BeaconTime): TimeDiff =
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TimeDiff(nanoseconds: a.ns_since_genesis - b.ns_since_genesis)
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template `+`*(a: TimeDiff, b: Duration): TimeDiff =
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TimeDiff(nanoseconds: a.nanoseconds + b.nanoseconds)
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const
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# Offsets from the start of the slot to when the corresponding message should
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# be sent
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#attesting
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2022-01-11 10:01:54 +00:00
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attestationSlotOffset* = TimeDiff(nanoseconds:
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NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#broadcast-aggregate
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aggregateSlotOffset* = TimeDiff(nanoseconds:
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NANOSECONDS_PER_SLOT.int64 * 2 div INTERVALS_PER_SLOT)
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#prepare-sync-committee-message
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2022-01-11 10:01:54 +00:00
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syncCommitteeMessageSlotOffset* = TimeDiff(nanoseconds:
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NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#broadcast-sync-committee-contribution
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2022-01-11 10:01:54 +00:00
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syncContributionSlotOffset* = TimeDiff(nanoseconds:
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NANOSECONDS_PER_SLOT.int64 * 2 div INTERVALS_PER_SLOT)
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#sync-committee
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2022-05-23 12:02:54 +00:00
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lightClientFinalityUpdateSlotOffset* = TimeDiff(nanoseconds:
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NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/light-client/p2p-interface.md#sync-committee
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2022-05-23 12:02:54 +00:00
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lightClientOptimisticUpdateSlotOffset* = TimeDiff(nanoseconds:
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2022-03-17 20:11:29 +00:00
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NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
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2022-01-11 10:01:54 +00:00
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func toFloatSeconds*(t: TimeDiff): float =
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float(t.nanoseconds) / 1_000_000_000.0
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func start_beacon_time*(s: Slot): BeaconTime =
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# The point in time that a slot begins
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const maxSlot = Slot(
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uint64(FAR_FUTURE_BEACON_TIME.ns_since_genesis) div NANOSECONDS_PER_SLOT)
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if s > maxSlot: FAR_FUTURE_BEACON_TIME
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else: BeaconTime(ns_since_genesis: int64(uint64(s) * NANOSECONDS_PER_SLOT))
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func block_deadline*(s: Slot): BeaconTime =
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s.start_beacon_time
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func attestation_deadline*(s: Slot): BeaconTime =
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s.start_beacon_time + attestationSlotOffset
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func aggregate_deadline*(s: Slot): BeaconTime =
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s.start_beacon_time + aggregateSlotOffset
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func sync_committee_message_deadline*(s: Slot): BeaconTime =
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s.start_beacon_time + syncCommitteeMessageSlotOffset
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func sync_contribution_deadline*(s: Slot): BeaconTime =
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s.start_beacon_time + syncContributionSlotOffset
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2022-05-23 12:02:54 +00:00
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func light_client_finality_update_time*(s: Slot): BeaconTime =
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s.start_beacon_time + lightClientFinalityUpdateSlotOffset
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func light_client_optimistic_update_time*(s: Slot): BeaconTime =
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s.start_beacon_time + lightClientOptimisticUpdateSlotOffset
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2022-01-11 10:01:54 +00:00
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func slotOrZero*(time: BeaconTime): Slot =
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let exSlot = time.toSlot
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if exSlot.afterGenesis: exSlot.slot
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else: Slot(0)
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2023-06-13 14:03:49 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#compute_epoch_at_slot
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2022-01-11 10:01:54 +00:00
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func epoch*(slot: Slot): Epoch = # aka compute_epoch_at_slot
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## Return the epoch number at ``slot``.
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if slot == FAR_FUTURE_SLOT: FAR_FUTURE_EPOCH
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else: Epoch(slot div SLOTS_PER_EPOCH)
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/fork-choice.md#compute_slots_since_epoch_start
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2022-01-11 10:01:54 +00:00
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func since_epoch_start*(slot: Slot): uint64 = # aka compute_slots_since_epoch_start
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## How many slots since the beginning of the epoch (`[0..SLOTS_PER_EPOCH-1]`)
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(slot mod SLOTS_PER_EPOCH)
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template is_epoch*(slot: Slot): bool =
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slot.since_epoch_start == 0
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2023-06-13 14:03:49 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#compute_start_slot_at_epoch
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2022-01-11 10:01:54 +00:00
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func start_slot*(epoch: Epoch): Slot = # aka compute_start_slot_at_epoch
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## Return the start slot of ``epoch``.
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const maxEpoch = Epoch(FAR_FUTURE_SLOT div SLOTS_PER_EPOCH)
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if epoch >= maxEpoch: FAR_FUTURE_SLOT
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else: Slot(epoch * SLOTS_PER_EPOCH)
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2023-08-12 10:38:06 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/beacon-chain.md#get_previous_epoch
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2022-01-11 10:01:54 +00:00
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func get_previous_epoch*(current_epoch: Epoch): Epoch =
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## Return the previous epoch (unless the current epoch is ``GENESIS_EPOCH``).
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if current_epoch == GENESIS_EPOCH:
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current_epoch
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else:
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current_epoch - 1
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iterator slots*(epoch: Epoch): Slot =
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let start_slot = start_slot(epoch)
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for slot in start_slot ..< start_slot + SLOTS_PER_EPOCH:
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yield slot
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2023-08-09 03:58:47 +00:00
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/validator.md#sync-committee
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2022-01-11 10:01:54 +00:00
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template sync_committee_period*(epoch: Epoch): SyncCommitteePeriod =
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if epoch == FAR_FUTURE_EPOCH: FAR_FUTURE_PERIOD
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else: SyncCommitteePeriod(epoch div EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
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template sync_committee_period*(slot: Slot): SyncCommitteePeriod =
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if slot == FAR_FUTURE_SLOT: FAR_FUTURE_PERIOD
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else: SyncCommitteePeriod(slot div SLOTS_PER_SYNC_COMMITTEE_PERIOD)
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func since_sync_committee_period_start*(slot: Slot): uint64 =
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## How many slots since the beginning of the epoch (`[0..SLOTS_PER_SYNC_COMMITTEE_PERIOD-1]`)
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(slot mod SLOTS_PER_SYNC_COMMITTEE_PERIOD)
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func since_sync_committee_period_start*(epoch: Epoch): uint64 =
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## How many slots since the beginning of the epoch (`[0..EPOCHS_PER_SYNC_COMMITTEE_PERIOD-1]`)
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(epoch mod EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
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template is_sync_committee_period*(slot: Slot): bool =
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slot.since_sync_committee_period_start() == 0
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template is_sync_committee_period*(epoch: Epoch): bool =
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epoch.since_sync_committee_period_start() == 0
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template start_epoch*(period: SyncCommitteePeriod): Epoch =
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2022-03-08 10:38:58 +00:00
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## Return the start epoch of ``period``.
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2022-01-11 10:01:54 +00:00
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const maxPeriod = SyncCommitteePeriod(
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FAR_FUTURE_EPOCH div EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
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if period >= maxPeriod: FAR_FUTURE_EPOCH
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else: Epoch(period * EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
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2022-03-08 10:38:58 +00:00
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template start_slot*(period: SyncCommitteePeriod): Slot =
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## Return the start slot of ``period``.
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const maxPeriod = SyncCommitteePeriod(
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FAR_FUTURE_SLOT div SLOTS_PER_SYNC_COMMITTEE_PERIOD)
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if period >= maxPeriod: FAR_FUTURE_SLOT
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else: Slot(period * SLOTS_PER_SYNC_COMMITTEE_PERIOD)
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2023-05-16 08:21:52 +00:00
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func proposer_dependent_slot*(epoch: Epoch): Slot =
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if epoch >= 1: epoch.start_slot() - 1 else: Slot(0)
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func attester_dependent_slot*(epoch: Epoch): Slot =
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if epoch >= 2: (epoch - 1).start_slot() - 1 else: Slot(0)
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2023-05-16 08:05:35 +00:00
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2022-01-17 19:12:36 +00:00
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func `$`*(t: BeaconTime): string =
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2022-01-11 10:01:54 +00:00
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if t.ns_since_genesis >= 0:
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$(timer.nanoseconds(t.ns_since_genesis))
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else:
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"-" & $(timer.nanoseconds(-t.ns_since_genesis))
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2022-01-17 19:12:36 +00:00
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func `$`*(t: TimeDiff): string =
|
2022-01-11 10:01:54 +00:00
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if t.nanoseconds >= 0:
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$(timer.nanoseconds(t.nanoseconds))
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else:
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"-" & $(timer.nanoseconds(-t.nanoseconds))
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2022-01-17 19:12:36 +00:00
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func shortLog*(t: BeaconTime | TimeDiff): string = $t
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|
2022-01-11 10:01:54 +00:00
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chronicles.formatIt BeaconTime: it.shortLog
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chronicles.formatIt TimeDiff: it.shortLog
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chronicles.formatIt Slot: it.shortLog
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chronicles.formatIt Epoch: it.shortLog
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chronicles.formatIt SyncCommitteePeriod: it.shortLog
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