nimbus-eth2/ncli/e2store.nim

269 lines
7.2 KiB
Nim

{.push raises: [].}
import
std/strformat,
stew/[arrayops, endians2, io2, results],
snappy,
../beacon_chain/spec/[beacon_time, forks],
../beacon_chain/spec/eth2_ssz_serialization
export io2
type
Era* = distinct uint64 # Time unit, similar to slot
const
E2Version* = [byte 0x65, 0x32]
E2Index* = [byte 0x69, 0x32]
SnappyBeaconBlock* = [byte 0x01, 0x00]
SnappyBeaconState* = [byte 0x02, 0x00]
TypeFieldLen = 2
LengthFieldLen = 4
ReservedFieldLen = 2
HeaderFieldLen = TypeFieldLen + LengthFieldLen + ReservedFieldLen
FAR_FUTURE_ERA* = Era(not 0'u64)
type
Type* = array[2, byte]
Header* = object
typ*: Type
len*: int
Index* = object
startSlot*: Slot
offsets*: seq[int64] # Absolute positions in file
ethTimeUnit Era
func era*(s: Slot): Era =
if s == FAR_FUTURE_SLOT: FAR_FUTURE_ERA
else: Era(s div SLOTS_PER_HISTORICAL_ROOT)
func start_slot*(e: Era): Slot =
const maxEra = Era(FAR_FUTURE_SLOT div SLOTS_PER_HISTORICAL_ROOT)
if e >= maxEra: FAR_FUTURE_SLOT
else: Slot(e.uint64 * SLOTS_PER_HISTORICAL_ROOT)
proc toString(v: IoErrorCode): string =
try: ioErrorMsg(v)
except Exception as e: raiseAssert e.msg
func eraRoot*(
genesis_validators_root: Eth2Digest,
historical_roots: openArray[Eth2Digest], era: Era): Opt[Eth2Digest] =
if era == Era(0): ok(genesis_validators_root)
elif era <= historical_roots.lenu64(): ok(historical_roots[int(uint64(era) - 1)])
else: err()
func eraFileName*(
cfg: RuntimeConfig, era: Era, eraRoot: Eth2Digest): string =
try:
&"{cfg.name()}-{era.uint64:05}-{shortLog(eraRoot)}.era"
except ValueError as exc:
raiseAssert exc.msg
proc append(f: IoHandle, data: openArray[byte]): Result[void, string] =
if (? writeFile(f, data).mapErr(toString)) != data.len.uint:
return err("could not write data")
ok()
proc appendHeader(f: IoHandle, typ: Type, dataLen: int): Result[int64, string] =
if dataLen.uint64 > uint32.high:
return err("entry does not fit 32-bit length")
let start = ? getFilePos(f).mapErr(toString)
? append(f, typ)
? append(f, toBytesLE(dataLen.uint32))
? append(f, [0'u8, 0'u8])
ok(start)
proc appendRecord*(
f: IoHandle, typ: Type, data: openArray[byte]): Result[int64, string] =
let start = ? appendHeader(f, typ, data.len())
? append(f, data)
ok(start)
proc toCompressedBytes(item: auto): seq[byte] =
snappy.encodeFramed(SSZ.encode(item))
proc appendRecord*(
f: IoHandle, v: ForkyTrustedSignedBeaconBlock): Result[int64, string] =
f.appendRecord(SnappyBeaconBlock, toCompressedBytes(v))
proc appendRecord*(f: IoHandle, v: ForkyBeaconState): Result[int64, string] =
f.appendRecord(SnappyBeaconState, toCompressedBytes(v))
proc appendIndex*(
f: IoHandle, startSlot: Slot, offsets: openArray[int64]):
Result[int64, string] =
let
len = offsets.len() * sizeof(int64) + 16
pos = ? f.appendHeader(E2Index, len)
? f.append(startSlot.uint64.toBytesLE())
for v in offsets:
? f.append(cast[uint64](v - pos).toBytesLE())
? f.append(offsets.lenu64().toBytesLE())
ok(pos)
proc appendRecord(f: IoHandle, index: Index): Result[int64, string] =
f.appendIndex(index.startSlot, index.offsets)
proc checkBytesLeft(f: IoHandle, expected: int64): Result[void, string] =
let size = ? getFileSize(f).mapErr(toString)
if expected > size:
return err("Record extends past end of file")
let pos = ? getFilePos(f).mapErr(toString)
if expected > size - pos:
return err("Record extends past end of file")
ok()
proc readFileExact(f: IoHandle, buf: var openArray[byte]): Result[void, string] =
if (? f.readFile(buf).mapErr(toString)) != buf.len().uint:
return err("missing data")
ok()
proc readHeader(f: IoHandle): Result[Header, string] =
var buf: array[10, byte]
? readFileExact(f, buf.toOpenArray(0, 7))
var
typ: Type
discard typ.copyFrom(buf)
# Cast safe because we had only 4 bytes of length data
let
len = cast[int64](uint32.fromBytesLE(buf.toOpenArray(2, 5)))
# No point reading these..
if len > int.high(): return err("header length exceeds int.high")
# Must have at least that much data, or header is invalid
? f.checkBytesLeft(len)
ok(Header(typ: typ, len: int(len)))
proc readRecord*(f: IoHandle, data: var seq[byte]): Result[Header, string] =
let header = ? readHeader(f)
if header.len > 0:
? f.checkBytesLeft(header.len)
data.setLen(header.len)
? readFileExact(f, data)
ok(header)
proc readIndexCount*(f: IoHandle): Result[int, string] =
var bytes: array[8, byte]
? f.readFileExact(bytes)
let count = uint64.fromBytesLE(bytes)
if count > (int.high() div 8) - 3: return err("count: too large")
let size = uint64(? f.getFileSize().mapErr(toString))
# Need to have at least this much data in the file to read an index with
# this count
if count > (size div 8 + 3): return err("count: too large")
ok(int(count)) # Sizes checked against int above
proc findIndexStartOffset*(f: IoHandle): Result[int64, string] =
? f.setFilePos(-8, SeekPosition.SeekCurrent).mapErr(toString)
let
count = ? f.readIndexCount() # Now we're back at the end of the index
bytes = count.int64 * 8 + 24
ok(-bytes)
proc readIndex*(f: IoHandle): Result[Index, string] =
let
startPos = ? f.getFilePos().mapErr(toString)
fileSize = ? f.getFileSize().mapErr(toString)
header = ? f.readHeader()
if header.typ != E2Index: return err("not an index")
if header.len < 16: return err("index entry too small")
if header.len mod 8 != 0: return err("index length invalid")
var buf: array[8, byte]
? f.readFileExact(buf)
let
slot = uint64.fromBytesLE(buf)
count = header.len div 8 - 2
var offsets = newSeqUninitialized[int64](count)
for i in 0..<count:
? f.readFileExact(buf)
let
offset = uint64.fromBytesLE(buf)
absolute =
if offset == 0: 0'i64
else:
# Wrapping math is actually convenient here
cast[int64](cast[uint64](startPos) + offset)
if absolute < 0 or absolute > fileSize: return err("Invalid offset")
offsets[i] = absolute
? f.readFileExact(buf)
if uint64(count) != uint64.fromBytesLE(buf): return err("invalid count")
# technically not an error, but we'll throw this sanity check in here..
if slot > int32.high().uint64: return err("fishy slot")
ok(Index(startSlot: Slot(slot), offsets: offsets))
type
EraGroup* = object
slotIndex*: Index
proc init*(
T: type EraGroup, f: IoHandle, startSlot: Option[Slot]): Result[T, string] =
discard ? f.appendHeader(E2Version, 0)
ok(EraGroup(
slotIndex: Index(
startSlot: startSlot.get(Slot(0)),
offsets: newSeq[int64](
if startSlot.isSome(): SLOTS_PER_HISTORICAL_ROOT.int
else: 0
))))
proc update*(
g: var EraGroup, f: IoHandle, slot: Slot, szBytes: openArray[byte]):
Result[void, string] =
doAssert slot >= g.slotIndex.startSlot
# doAssert slot < g.slotIndex.startSlot + g.slotIndex.offsets.len
g.slotIndex.offsets[int(slot - g.slotIndex.startSlot)] =
? f.appendRecord(SnappyBeaconBlock, szBytes)
ok()
proc finish*(
g: var EraGroup, f: IoHandle, state: ForkyBeaconState):
Result[void, string] =
let
statePos = ? f.appendRecord(state)
if state.slot > Slot(0):
discard ? f.appendRecord(g.slotIndex)
discard ? f.appendIndex(state.slot, [statePos])
ok()