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Proc to func in enr code and style guide related clean-up (#555) 

Should not have any functional changes. Clean-up related to
avoiding result usage (also implicit), and other style
guide items.
This commit is contained in:
Kim De Mey 2022-11-15 10:34:56 +01:00 committed by GitHub
parent 522db295f2
commit 4b22fcdce4
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 101 additions and 73 deletions
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156
eth/p2p/discoveryv5/enr.nim
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@ -28,7 +28,6 @@ type
Record* = object
seqNum*: uint64
# signature: seq[byte]
raw*: seq[byte] # RLP encoded record
pairs: seq[FieldPair] # sorted list of all key/value pairs
@ -78,25 +77,27 @@ template toField[T](v: T): Field =
else:
{.error: "Unsupported field type".}
proc `==`(a, b: Field): bool =
func `==`(a, b: Field): bool =
if a.kind == b.kind:
case a.kind
of kString:
return a.str == b.str
a.str == b.str
of kNum:
return a.num == b.num
a.num == b.num
of kBytes:
return a.bytes == b.bytes
a.bytes == b.bytes
of kList:
return a.listRaw == b.listRaw
a.listRaw == b.listRaw
else:
return false
false
proc cmp(a, b: FieldPair): int = cmp(a[0], b[0])
func cmp(a, b: FieldPair): int = cmp(a[0], b[0])
proc makeEnrRaw(seqNum: uint64, pk: PrivateKey,
func makeEnrRaw(
seqNum: uint64, pk: PrivateKey,
pairs: openArray[FieldPair]): EnrResult[seq[byte]] =
proc append(w: var RlpWriter, seqNum: uint64,
func append(
w: var RlpWriter, seqNum: uint64,
pairs: openArray[FieldPair]): seq[byte] =
w.append(seqNum)
for (k, v) in pairs:
@ -124,7 +125,8 @@ proc makeEnrRaw(seqNum: uint64, pk: PrivateKey,
else:
ok(raw)
proc makeEnrAux(seqNum: uint64, pk: PrivateKey,
func makeEnrAux(
seqNum: uint64, pk: PrivateKey,
pairs: openArray[FieldPair]): EnrResult[Record] =
var record: Record
record.pairs = @pairs
@ -144,7 +146,8 @@ proc makeEnrAux(seqNum: uint64, pk: PrivateKey,
record.raw = ? makeEnrRaw(seqNum, pk, record.pairs)
ok(record)
macro initRecord*(seqNum: uint64, pk: PrivateKey,
macro initRecord*(
seqNum: uint64, pk: PrivateKey,
pairs: untyped{nkTableConstr}): untyped =
## Initialize a `Record` with given sequence number, private key and k:v
## pairs.
@ -160,7 +163,9 @@ macro initRecord*(seqNum: uint64, pk: PrivateKey,
template toFieldPair*(key: string, value: auto): FieldPair =
(key, toField(value))
proc addAddress(fields: var seq[FieldPair], ip: Option[ValidIpAddress],
func addAddress(
fields: var seq[FieldPair],
ip: Option[ValidIpAddress],
tcpPort, udpPort: Option[Port]) =
## Add address information in new fields. Incomplete address
## information is allowed (example: Port but not IP) as that information
@ -182,8 +187,9 @@ proc addAddress(fields: var seq[FieldPair], ip: Option[ValidIpAddress],
if udpPort.isSome():
fields.add(("udp", udpPort.get().uint16.toField))
proc init*(T: type Record, seqNum: uint64,
pk: PrivateKey,
func init*(
T: type Record,
seqNum: uint64, pk: PrivateKey,
ip: Option[ValidIpAddress],
tcpPort, udpPort: Option[Port],
extraFields: openArray[FieldPair] = []):
@ -199,7 +205,7 @@ proc init*(T: type Record, seqNum: uint64,
fields.add extraFields
makeEnrAux(seqNum, pk, fields)
proc getField(r: Record, name: string, field: var Field): bool =
func getField(r: Record, name: string, field: var Field): bool =
# It might be more correct to do binary search,
# as the fields are sorted, but it's unlikely to
# make any difference in reality.
@ -207,14 +213,15 @@ proc getField(r: Record, name: string, field: var Field): bool =
if k == name:
field = v
return true
false
proc requireKind(f: Field, kind: FieldKind): EnrResult[void] =
func requireKind(f: Field, kind: FieldKind): EnrResult[void] =
if f.kind != kind:
err("Wrong field kind")
else:
ok()
proc get*(r: Record, key: string, T: type): EnrResult[T] =
func get*(r: Record, key: string, T: type): EnrResult[T] =
## Get the value from the provided key.
var f: Field
if r.getField(key, f):
@ -250,7 +257,7 @@ proc get*(r: Record, key: string, T: type): EnrResult[T] =
else:
err("Key not found in ENR")
proc get*(r: Record, T: type PublicKey): Option[T] =
func get*(r: Record, T: type PublicKey): Option[T] =
## Get the `PublicKey` from provided `Record`. Return `none` when there is
## no `PublicKey` in the record.
var pubkeyField: Field
@ -258,16 +265,19 @@ proc get*(r: Record, T: type PublicKey): Option[T] =
let pk = PublicKey.fromRaw(pubkeyField.bytes)
if pk.isOk:
return some pk[]
none(T)
proc find(r: Record, key: string): Option[int] =
func find(r: Record, key: string): Option[int] =
## Search for key in record key:value pairs.
##
## Returns some(index of key) if key is found in record. Else return none.
for i, (k, v) in r.pairs:
if k == key:
return some(i)
none(int)
proc update*(record: var Record, pk: PrivateKey,
func update*(
record: var Record, pk: PrivateKey,
fieldPairs: openArray[FieldPair]): EnrResult[void] =
## Update a `Record` k:v pairs.
##
@ -308,7 +318,9 @@ proc update*(record: var Record, pk: PrivateKey,
ok()
proc update*(r: var Record, pk: PrivateKey,
func update*(
r: var Record,
pk: PrivateKey,
ip: Option[ValidIpAddress],
tcpPort, udpPort: Option[Port] = none[Port](),
extraFields: openArray[FieldPair] = []):
@ -329,7 +341,7 @@ proc update*(r: var Record, pk: PrivateKey,
fields.add extraFields
r.update(pk, fields)
proc tryGet*(r: Record, key: string, T: type): Option[T] =
func tryGet*(r: Record, key: string, T: type): Option[T] =
## Get the value from the provided key.
## Return `none` if the key does not exist or if the value is invalid
## according to type `T`.
@ -339,7 +351,7 @@ proc tryGet*(r: Record, key: string, T: type): Option[T] =
else:
none(T)
proc toTypedRecord*(r: Record): EnrResult[TypedRecord] =
func toTypedRecord*(r: Record): EnrResult[TypedRecord] =
let id = r.tryGet("id", string)
if id.isSome:
var tr: TypedRecord
@ -360,24 +372,29 @@ proc toTypedRecord*(r: Record): EnrResult[TypedRecord] =
else:
err("Record without id field")
proc contains*(r: Record, fp: (string, seq[byte])): bool =
func contains*(r: Record, fp: (string, seq[byte])): bool =
# TODO: use FieldPair for this, but that is a bit cumbersome. Perhaps the
# `get` call can be improved to make this easier.
let field = r.tryGet(fp[0], seq[byte])
if field.isSome():
if field.get() == fp[1]:
return true
false
proc verifySignatureV4(r: Record, sigData: openArray[byte], content: seq[byte]):
bool =
func verifySignatureV4(
r: Record, sigData: openArray[byte], content: seq[byte]): bool =
let publicKey = r.get(PublicKey)
if publicKey.isSome:
let sig = SignatureNR.fromRaw(sigData)
if sig.isOk:
var h = keccak256.digest(content)
return verify(sig[], SkMessage(h.data), publicKey.get)
if publicKey.isNone():
return false
proc verifySignature(r: Record): bool {.raises: [RlpError, Defect].} =
let sig = SignatureNR.fromRaw(sigData)
if sig.isOk():
var h = keccak256.digest(content)
verify(sig[], SkMessage(h.data), publicKey.get)
else:
false
func verifySignature(r: Record): bool {.raises: [RlpError, Defect].} =
var rlp = rlpFromBytes(r.raw)
let sz = rlp.listLen
if not rlp.enterList:
@ -395,12 +412,15 @@ proc verifySignature(r: Record): bool {.raises: [RlpError, Defect].} =
if r.getField("id", id) and id.kind == kString:
case id.str
of "v4":
result = verifySignatureV4(r, sigData, content)
verifySignatureV4(r, sigData, content)
else:
# Unknown Identity Scheme
discard
false
else:
# No Identity Scheme provided
false
proc fromBytesAux(r: var Record): bool {.raises: [RlpError, Defect].} =
func fromBytesAux(r: var Record): bool {.raises: [RlpError, Defect].} =
if r.raw.len > maxEnrSize:
return false
@ -447,39 +467,41 @@ proc fromBytesAux(r: var Record): bool {.raises: [RlpError, Defect].} =
verifySignature(r)
proc fromBytes*(r: var Record, s: openArray[byte]): bool =
func fromBytes*(r: var Record, s: openArray[byte]): bool =
## Loads ENR from rlp-encoded bytes, and validates the signature.
r.raw = @s
try:
result = fromBytesAux(r)
fromBytesAux(r)
except RlpError:
discard
false
proc fromBase64*(r: var Record, s: string): bool =
func fromBase64*(r: var Record, s: string): bool =
## Loads ENR from base64-encoded rlp-encoded bytes, and validates the
## signature.
try:
r.raw = Base64Url.decode(s)
result = fromBytesAux(r)
fromBytesAux(r)
except RlpError, Base64Error:
discard
false
proc fromURI*(r: var Record, s: string): bool =
func fromURI*(r: var Record, s: string): bool =
## Loads ENR from its text encoding: base64-encoded rlp-encoded bytes,
## prefixed with "enr:". Validates the signature.
const prefix = "enr:"
if s.startsWith(prefix):
result = r.fromBase64(s[prefix.len .. ^1])
r.fromBase64(s[prefix.len .. ^1])
else:
false
template fromURI*(r: var Record, url: EnrUri): bool =
fromURI(r, string(url))
proc toBase64*(r: Record): string =
result = Base64Url.encode(r.raw)
func toBase64*(r: Record): string =
Base64Url.encode(r.raw)
proc toURI*(r: Record): string = "enr:" & r.toBase64
func toURI*(r: Record): string = "enr:" & r.toBase64
proc `$`(f: Field): string =
func `$`(f: Field): string =
case f.kind
of kNum:
$f.num
@ -493,42 +515,48 @@ proc `$`(f: Field): string =
func `$`*(fp: FieldPair): string =
fp[0] & ":" & $fp[1]
proc `$`*(r: Record): string =
result = "("
result &= $r.seqNum
func `$`*(r: Record): string =
var res = "("
res &= $r.seqNum
for (k, v) in r.pairs:
result &= ", "
result &= k
result &= ": "
res &= ", "
res &= k
res &= ": "
# For IP addresses we print something prettier than the default kinds
# Note: Could disallow for invalid IPs in ENR also.
if k == "ip":
let ip = r.tryGet("ip", array[4, byte])
if ip.isSome():
result &= $ipv4(ip.get())
res &= $ipv4(ip.get())
else:
result &= "(Invalid) " & $v
res &= "(Invalid) " & $v
elif k == "ip6":
let ip = r.tryGet("ip6", array[16, byte])
if ip.isSome():
result &= $ipv6(ip.get())
res &= $ipv6(ip.get())
else:
result &= "(Invalid) " & $v
res &= "(Invalid) " & $v
else:
result &= $v
result &= ')'
res &= $v
res &= ')'
proc `==`*(a, b: Record): bool = a.raw == b.raw
res
proc read*(rlp: var Rlp, T: typedesc[Record]):
func `==`*(a, b: Record): bool = a.raw == b.raw
func read*(
rlp: var Rlp, T: type Record):
T {.raises: [RlpError, ValueError, Defect].} =
if not rlp.hasData() or not result.fromBytes(rlp.rawData):
var res: T
if not rlp.hasData() or not res.fromBytes(rlp.rawData):
# TODO: This could also just be an invalid signature, would be cleaner to
# split of RLP deserialisation errors from this.
raise newException(ValueError, "Could not deserialize")
rlp.skipElem()
proc append*(rlpWriter: var RlpWriter, value: Record) =
res
func append*(rlpWriter: var RlpWriter, value: Record) =
rlpWriter.appendRawBytes(value.raw)
chronicles.formatIt(seq[FieldPair]): $it

2
tests/p2p/test_enr.nim
View File

@ -44,7 +44,7 @@ suite "ENR":
var r: Record
check not fromBytes(r, [])
test "Base64 deserialsation without data":
test "Base64 deserialisation without data":
var r: Record
let sigValid = r.fromURI("enr:")
check(not sigValid)