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nim-libp2p-experimental/libp2p/multiaddress.nim

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## Nim-Libp2p
## Copyright (c) 2018 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
## This module implements MultiAddress.
{.push raises: [Defect].}
import pkg/chronos
import std/[nativesockets, hashes]
import tables, strutils, sets, stew/shims/net
import multicodec, multihash, multibase, transcoder, vbuffer, peerid,
protobuf/minprotobuf, errors
import stew/[base58, base32, endians2, results]
export results, minprotobuf, vbuffer
type
MAKind* = enum
None, Fixed, Length, Path, Marker
MAProtocol* = object
mcodec*: MultiCodec
size*: int
kind: MAKind
coder*: Transcoder
MultiAddress* = object
data*: VBuffer
MaPatternOp* = enum
Eq, Or, And
MaPattern* = object
operator*: MaPatternOp
args*: seq[MaPattern]
value*: MultiCodec
MaPatResult* = object
flag*: bool
rem*: seq[MultiCodec]
MaResult*[T] = Result[T, string]
MaError* = object of LPError
MaInvalidAddress* = object of MaError
IpTransportProtocol* = enum
tcpProtocol
udpProtocol
const
# These are needed in order to avoid an ambiguity error stemming from
# some cint constants with the same name defined in the posix modules
IPPROTO_TCP = Protocol.IPPROTO_TCP
IPPROTO_UDP = Protocol.IPPROTO_UDP
proc hash*(a: MultiAddress): Hash =
var h: Hash = 0
h = h !& hash(a.data.buffer)
h = h !& hash(a.data.offset)
!$h
proc ip4StB(s: string, vb: var VBuffer): bool =
## IPv4 stringToBuffer() implementation.
try:
var a = parseIpAddress(s)
if a.family == IpAddressFamily.IPv4:
vb.writeArray(a.address_v4)
result = true
except:
discard
proc ip4BtS(vb: var VBuffer, s: var string): bool =
## IPv4 bufferToString() implementation.
var a = IpAddress(family: IpAddressFamily.IPv4)
if vb.readArray(a.address_v4) == 4:
s = $a
result = true
proc ip4VB(vb: var VBuffer): bool =
## IPv4 validateBuffer() implementation.
var a = IpAddress(family: IpAddressFamily.IPv4)
if vb.readArray(a.address_v4) == 4:
result = true
proc ip6StB(s: string, vb: var VBuffer): bool =
## IPv6 stringToBuffer() implementation.
try:
var a = parseIpAddress(s)
if a.family == IpAddressFamily.IPv6:
vb.writeArray(a.address_v6)
result = true
except:
discard
proc ip6BtS(vb: var VBuffer, s: var string): bool =
## IPv6 bufferToString() implementation.
var a = IpAddress(family: IpAddressFamily.IPv6)
if vb.readArray(a.address_v6) == 16:
s = $a
result = true
proc ip6VB(vb: var VBuffer): bool =
## IPv6 validateBuffer() implementation.
var a = IpAddress(family: IpAddressFamily.IPv6)
if vb.readArray(a.address_v6) == 16:
result = true
proc ip6zoneStB(s: string, vb: var VBuffer): bool =
## IPv6 stringToBuffer() implementation.
if len(s) > 0:
vb.writeSeq(s)
result = true
proc ip6zoneBtS(vb: var VBuffer, s: var string): bool =
## IPv6 bufferToString() implementation.
if vb.readSeq(s) > 0:
result = true
proc ip6zoneVB(vb: var VBuffer): bool =
## IPv6 validateBuffer() implementation.
var s = ""
if vb.readSeq(s) > 0:
if s.find('/') == -1:
result = true
proc portStB(s: string, vb: var VBuffer): bool =
## Port number stringToBuffer() implementation.
var port: array[2, byte]
try:
var nport = parseInt(s)
if (nport >= 0) and (nport < 65536):
port[0] = cast[byte]((nport shr 8) and 0xFF)
port[1] = cast[byte](nport and 0xFF)
vb.writeArray(port)
result = true
except:
discard
proc portBtS(vb: var VBuffer, s: var string): bool =
## Port number bufferToString() implementation.
var port: array[2, byte]
if vb.readArray(port) == 2:
var nport = (cast[uint16](port[0]) shl 8) or cast[uint16](port[1])
s = $nport
result = true
proc portVB(vb: var VBuffer): bool =
## Port number validateBuffer() implementation.
var port: array[2, byte]
if vb.readArray(port) == 2:
result = true
proc p2pStB(s: string, vb: var VBuffer): bool =
## P2P address stringToBuffer() implementation.
try:
var data = Base58.decode(s)
var mh: MultiHash
if MultiHash.decode(data, mh).isOk:
vb.writeSeq(data)
result = true
except:
discard
proc p2pBtS(vb: var VBuffer, s: var string): bool =
## P2P address bufferToString() implementation.
var address = newSeq[byte]()
if vb.readSeq(address) > 0:
var mh: MultiHash
if MultiHash.decode(address, mh).isOk:
s = Base58.encode(address)
result = true
proc p2pVB(vb: var VBuffer): bool =
## P2P address validateBuffer() implementation.
var address = newSeq[byte]()
if vb.readSeq(address) > 0:
var mh: MultiHash
if MultiHash.decode(address, mh).isOk:
result = true
proc onionStB(s: string, vb: var VBuffer): bool =
try:
var parts = s.split(':')
if len(parts) != 2:
return false
if len(parts[0]) != 16:
return false
var address = Base32Lower.decode(parts[0].toLowerAscii())
var nport = parseInt(parts[1])
if (nport > 0 and nport < 65536) and len(address) == 10:
address.setLen(12)
address[10] = cast[byte]((nport shr 8) and 0xFF)
address[11] = cast[byte](nport and 0xFF)
vb.writeArray(address)
result = true
except:
discard
proc onionBtS(vb: var VBuffer, s: var string): bool =
## ONION address bufferToString() implementation.
var buf: array[12, byte]
if vb.readArray(buf) == 12:
var nport = (cast[uint16](buf[10]) shl 8) or cast[uint16](buf[11])
s = Base32Lower.encode(buf.toOpenArray(0, 9))
s.add(":")
s.add($nport)
result = true
proc onionVB(vb: var VBuffer): bool =
## ONION address validateBuffer() implementation.
var buf: array[12, byte]
if vb.readArray(buf) == 12:
result = true
proc unixStB(s: string, vb: var VBuffer): bool =
## Unix socket name stringToBuffer() implementation.
if len(s) > 0:
vb.writeSeq(s)
result = true
proc unixBtS(vb: var VBuffer, s: var string): bool =
## Unix socket name bufferToString() implementation.
s = ""
if vb.readSeq(s) > 0:
result = true
proc unixVB(vb: var VBuffer): bool =
## Unix socket name validateBuffer() implementation.
var s = ""
if vb.readSeq(s) > 0:
result = true
proc dnsStB(s: string, vb: var VBuffer): bool =
## DNS name stringToBuffer() implementation.
if len(s) > 0:
vb.writeSeq(s)
result = true
proc dnsBtS(vb: var VBuffer, s: var string): bool =
## DNS name bufferToString() implementation.
s = ""
if vb.readSeq(s) > 0:
result = true
proc dnsVB(vb: var VBuffer): bool =
## DNS name validateBuffer() implementation.
var s = ""
if vb.readSeq(s) > 0:
if s.find('/') == -1:
result = true
proc mapEq*(codec: string): MaPattern =
## ``Equal`` operator for pattern
result.operator = Eq
result.value = multiCodec(codec)
proc mapOr*(args: varargs[MaPattern]): MaPattern =
## ``Or`` operator for pattern
result.operator = Or
result.args = @args
proc mapAnd*(args: varargs[MaPattern]): MaPattern =
## ``And`` operator for pattern
result.operator = And
result.args = @args
const
TranscoderIP4* = Transcoder(
stringToBuffer: ip4StB,
bufferToString: ip4BtS,
validateBuffer: ip4VB
)
TranscoderIP6* = Transcoder(
stringToBuffer: ip6StB,
bufferToString: ip6BtS,
validateBuffer: ip6VB
)
TranscoderIP6Zone* = Transcoder(
stringToBuffer: ip6zoneStB,
bufferToString: ip6zoneBtS,
validateBuffer: ip6zoneVB
)
TranscoderUnix* = Transcoder(
stringToBuffer: unixStB,
bufferToString: unixBtS,
validateBuffer: unixVB
)
TranscoderP2P* = Transcoder(
stringToBuffer: p2pStB,
bufferToString: p2pBtS,
validateBuffer: p2pVB
)
TranscoderPort* = Transcoder(
stringToBuffer: portStB,
bufferToString: portBtS,
validateBuffer: portVB
)
TranscoderOnion* = Transcoder(
stringToBuffer: onionStB,
bufferToString: onionBtS,
validateBuffer: onionVB
)
TranscoderDNS* = Transcoder(
stringToBuffer: dnsStB,
bufferToString: dnsBtS,
validateBuffer: dnsVB
)
ProtocolsList = [
MAProtocol(
mcodec: multiCodec("ip4"), kind: Fixed, size: 4,
coder: TranscoderIP4
),
MAProtocol(
mcodec: multiCodec("tcp"), kind: Fixed, size: 2,
coder: TranscoderPort
),
MAProtocol(
mcodec: multiCodec("udp"), kind: Fixed, size: 2,
coder: TranscoderPort
),
MAProtocol(
mcodec: multiCodec("ip6"), kind: Fixed, size: 16,
coder: TranscoderIP6
),
MAProtocol(
mcodec: multiCodec("dccp"), kind: Fixed, size: 2,
coder: TranscoderPort
),
MAProtocol(
mcodec: multiCodec("sctp"), kind: Fixed, size: 2,
coder: TranscoderPort
),
MAProtocol(
mcodec: multiCodec("udt"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("utp"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("http"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("https"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("quic"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("ip6zone"), kind: Length, size: 0,
coder: TranscoderIP6Zone
),
MAProtocol(
mcodec: multiCodec("onion"), kind: Fixed, size: 10,
coder: TranscoderOnion
),
MAProtocol(
mcodec: multiCodec("ws"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("wss"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("ipfs"), kind: Length, size: 0,
coder: TranscoderP2P
),
MAProtocol(
mcodec: multiCodec("p2p"), kind: Length, size: 0,
coder: TranscoderP2P
),
MAProtocol(
mcodec: multiCodec("unix"), kind: Path, size: 0,
coder: TranscoderUnix
),
MAProtocol(
mcodec: multiCodec("dns"), kind: Length, size: 0,
coder: TranscoderDNS
),
MAProtocol(
mcodec: multiCodec("dns4"), kind: Length, size: 0,
coder: TranscoderDNS
),
MAProtocol(
mcodec: multiCodec("dns6"), kind: Length, size: 0,
coder: TranscoderDNS
),
MAProtocol(
mcodec: multiCodec("dnsaddr"), kind: Length, size: 0,
coder: TranscoderDNS
),
MAProtocol(
mcodec: multiCodec("p2p-circuit"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("p2p-websocket-star"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("p2p-webrtc-star"), kind: Marker, size: 0
),
MAProtocol(
mcodec: multiCodec("p2p-webrtc-direct"), kind: Marker, size: 0
)
]
DNSANY* = mapEq("dns")
DNS4* = mapEq("dns4")
DNS6* = mapEq("dns6")
DNSADDR* = mapEq("dnsaddr")
IP4* = mapEq("ip4")
IP6* = mapEq("ip6")
DNS* = mapOr(DNSANY, DNS4, DNS6, DNSADDR)
IP* = mapOr(IP4, IP6)
TCP* = mapOr(mapAnd(DNS, mapEq("tcp")), mapAnd(IP, mapEq("tcp")))
UDP* = mapOr(mapAnd(DNS, mapEq("udp")), mapAnd(IP, mapEq("udp")))
UTP* = mapAnd(UDP, mapEq("utp"))
QUIC* = mapAnd(UDP, mapEq("quic"))
UNIX* = mapEq("unix")
WS* = mapAnd(TCP, mapEq("ws"))
WSS* = mapAnd(TCP, mapEq("wss"))
WebSockets* = mapOr(WS, WSS)
Unreliable* = mapOr(UDP)
Reliable* = mapOr(TCP, UTP, QUIC)
IPFS* = mapAnd(Reliable, mapEq("p2p"))
HTTP* = mapOr(
mapAnd(TCP, mapEq("http")),
mapAnd(IP, mapEq("http")),
mapAnd(DNS, mapEq("http"))
)
HTTPS* = mapOr(
mapAnd(TCP, mapEq("https")),
mapAnd(IP, mapEq("https")),
mapAnd(DNS, mapEq("https"))
)
WebRTCDirect* = mapOr(
mapAnd(HTTP, mapEq("p2p-webrtc-direct")),
mapAnd(HTTPS, mapEq("p2p-webrtc-direct"))
)
proc initMultiAddressCodeTable(): Table[MultiCodec,
MAProtocol] {.compileTime.} =
for item in ProtocolsList:
result[item.mcodec] = item
const
CodeAddresses = initMultiAddressCodeTable()
proc trimRight(s: string, ch: char): string =
## Consume trailing characters ``ch`` from string ``s`` and return result.
var m = 0
for i in countdown(s.high, 0):
if s[i] == ch:
inc(m)
else:
break
result = s[0..(s.high - m)]
proc shcopy*(m1: var MultiAddress, m2: MultiAddress) =
shallowCopy(m1.data.buffer, m2.data.buffer)
m1.data.offset = m2.data.offset
proc protoCode*(ma: MultiAddress): MaResult[MultiCodec] =
## Returns MultiAddress ``ma`` protocol code.
var header: uint64
var vb: MultiAddress
shcopy(vb, ma)
if vb.data.readVarint(header) == -1:
err("multiaddress: Malformed binary address!")
else:
let proto = CodeAddresses.getOrDefault(MultiCodec(header))
if proto.kind == None:
err("multiaddress: Unsupported protocol '" & $header & "'")
else:
ok(proto.mcodec)
proc protoName*(ma: MultiAddress): MaResult[string] =
## Returns MultiAddress ``ma`` protocol name.
var header: uint64
var vb: MultiAddress
shcopy(vb, ma)
if vb.data.readVarint(header) == -1:
err("multiaddress: Malformed binary address!")
else:
let proto = CodeAddresses.getOrDefault(MultiCodec(header))
if proto.kind == None:
err("multiaddress: Unsupported protocol '" & $header & "'")
else:
ok($(proto.mcodec))
proc protoArgument*(ma: MultiAddress,
value: var openarray[byte]): MaResult[int] =
## Returns MultiAddress ``ma`` protocol argument value.
##
## If current MultiAddress do not have argument value, then result will be
## ``0``.
var header: uint64
var vb: MultiAddress
var buffer: seq[byte]
shcopy(vb, ma)
if vb.data.readVarint(header) == -1:
err("multiaddress: Malformed binary address!")
else:
let proto = CodeAddresses.getOrDefault(MultiCodec(header))
if proto.kind == None:
err("multiaddress: Unsupported protocol '" & $header & "'")
else:
var res: int
if proto.kind == Fixed:
res = proto.size
if len(value) >= res and
vb.data.readArray(value.toOpenArray(0, proto.size - 1)) != proto.size:
err("multiaddress: Decoding protocol error")
else:
ok(res)
elif proto.kind in {Length, Path}:
if vb.data.readSeq(buffer) == -1:
err("multiaddress: Decoding protocol error")
else:
res = len(buffer)
if len(value) >= res:
copyMem(addr value[0], addr buffer[0], res)
ok(res)
else:
ok(res)
proc protoAddress*(ma: MultiAddress): MaResult[seq[byte]] =
## Returns MultiAddress ``ma`` protocol address binary blob.
##
## If current MultiAddress do not have argument value, then result array will
## be empty.
var buffer = newSeq[byte](len(ma.data.buffer))
let res = ? protoArgument(ma, buffer)
buffer.setLen(res)
ok(buffer)
proc getPart(ma: MultiAddress, index: int): MaResult[MultiAddress] =
var header: uint64
var data = newSeq[byte]()
var offset = 0
var vb = ma
var res: MultiAddress
res.data = initVBuffer()
while offset <= index:
if vb.data.readVarint(header) == -1:
return err("multiaddress: Malformed binary address!")
let proto = CodeAddresses.getOrDefault(MultiCodec(header))
if proto.kind == None:
return err("multiaddress: Unsupported protocol '" & $header & "'")
elif proto.kind == Fixed:
data.setLen(proto.size)
if vb.data.readArray(data) != proto.size:
return err("multiaddress: Decoding protocol error")
if offset == index:
res.data.writeVarint(header)
res.data.writeArray(data)
res.data.finish()
elif proto.kind in {Length, Path}:
if vb.data.readSeq(data) == -1:
return err("multiaddress: Decoding protocol error")
if offset == index:
res.data.writeVarint(header)
res.data.writeSeq(data)
res.data.finish()
elif proto.kind == Marker:
if offset == index:
res.data.writeVarint(header)
res.data.finish()
inc(offset)
ok(res)
proc `[]`*(ma: MultiAddress, i: int): MaResult[MultiAddress] {.inline.} =
## Returns part with index ``i`` of MultiAddress ``ma``.
ma.getPart(i)
iterator items*(ma: MultiAddress): MaResult[MultiAddress] =
## Iterates over all addresses inside of MultiAddress ``ma``.
var header: uint64
var data = newSeq[byte]()
var vb = ma
while true:
if vb.data.isEmpty():
break
var res = MultiAddress(data: initVBuffer())
if vb.data.readVarint(header) == -1:
yield err(MaResult[MultiAddress], "Malformed binary address!")
let proto = CodeAddresses.getOrDefault(MultiCodec(header))
if proto.kind == None:
yield err(MaResult[MultiAddress], "Unsupported protocol '" &
$header & "'")
elif proto.kind == Fixed:
data.setLen(proto.size)
if vb.data.readArray(data) != proto.size:
yield err(MaResult[MultiAddress], "Decoding protocol error")
res.data.writeVarint(header)
res.data.writeArray(data)
elif proto.kind in {Length, Path}:
if vb.data.readSeq(data) == -1:
yield err(MaResult[MultiAddress], "Decoding protocol error")
res.data.writeVarint(header)
res.data.writeSeq(data)
elif proto.kind == Marker:
res.data.writeVarint(header)
res.data.finish()
yield ok(MaResult[MultiAddress], res)
proc contains*(ma: MultiAddress, codec: MultiCodec): MaResult[bool] {.inline.} =
## Returns ``true``, if address with MultiCodec ``codec`` present in
## MultiAddress ``ma``.
for item in ma.items:
let code = ?(?item).protoCode()
if code == codec:
return ok(true)
ok(false)
proc `[]`*(ma: MultiAddress,
codec: MultiCodec): MaResult[MultiAddress] {.inline.} =
## Returns partial MultiAddress with MultiCodec ``codec`` and present in
## MultiAddress ``ma``.
for item in ma.items:
if ?(?item).protoCode == codec:
return item
err("multiaddress: Codec is not present in address")
proc toString*(value: MultiAddress): MaResult[string] =
## Return string representation of MultiAddress ``value``.
var header: uint64
var vb = value
var parts = newSeq[string]()
var part: string
var res: string
while true:
if vb.data.isEmpty():
break
if vb.data.readVarint(header) == -1:
return err("multiaddress: Malformed binary address!")
let proto = CodeAddresses.getOrDefault(MultiCodec(header))
if proto.kind == None:
return err("multiaddress: Unsupported protocol '" & $header & "'")
if proto.kind in {Fixed, Length, Path}:
if isNil(proto.coder.bufferToString):
return err("multiaddress: Missing protocol '" & $(proto.mcodec) &
"' coder")
if not proto.coder.bufferToString(vb.data, part):
return err("multiaddress: Decoding protocol error")
parts.add($(proto.mcodec))
if proto.kind == Path and part[0] == '/':
parts.add(part[1..^1])
else:
parts.add(part)
elif proto.kind == Marker:
parts.add($(proto.mcodec))
if len(parts) > 0:
res = "/" & parts.join("/")
ok(res)
proc `$`*(value: MultiAddress): string {.raises: [Defect].} =
## Return string representation of MultiAddress ``value``.
let s = value.toString()
if s.isErr: s.error
else: s[]
proc protocols*(value: MultiAddress): MaResult[seq[MultiCodec]] =
## Returns list of protocol codecs inside of MultiAddress ``value``.
var res = newSeq[MultiCodec]()
for item in value.items():
res.add(?(?item).protoCode())
ok(res)
proc hex*(value: MultiAddress): string =
## Return hexadecimal string representation of MultiAddress ``value``.
$(value.data)
proc write*(vb: var VBuffer, ma: MultiAddress) {.inline.} =
## Write MultiAddress value ``ma`` to buffer ``vb``.
vb.writeArray(ma.data.buffer)
proc encode*(mbtype: typedesc[MultiBase], encoding: string,
ma: MultiAddress): string {.inline.} =
## Get MultiBase encoded representation of ``ma`` using encoding
## ``encoding``.
result = MultiBase.encode(encoding, ma.data.buffer)
proc validate*(ma: MultiAddress): bool =
## Returns ``true`` if MultiAddress ``ma`` is valid.
var header: uint64
var vb: MultiAddress
shcopy(vb, ma)
while true:
if vb.data.isEmpty():
break
if vb.data.readVarint(header) == -1:
return false
let proto = CodeAddresses.getOrDefault(MultiCodec(header))
if proto.kind == None:
return false
if proto.kind in {Fixed, Length, Path}:
if isNil(proto.coder.validateBuffer):
return false
if not proto.coder.validateBuffer(vb.data):
return false
else:
discard
result = true
proc init*(
mtype: typedesc[MultiAddress], protocol: MultiCodec,
value: openarray[byte] = []): MaResult[MultiAddress] =
## Initialize MultiAddress object from protocol id ``protocol`` and array
## of bytes ``value``.
let proto = CodeAddresses.getOrDefault(protocol)
if proto.kind == None:
err("multiaddress: Protocol not found")
else:
var res: MultiAddress
res.data = initVBuffer()
res.data.writeVarint(cast[uint64](proto.mcodec))
case proto.kind
of Fixed, Length, Path:
if len(value) == 0:
err("multiaddress: Value must not be empty array")
else:
if proto.kind == Fixed:
res.data.writeArray(value)
else:
res.data.writeSeq(value)
res.data.finish()
ok(res)
of Marker:
if len(value) != 0:
err("multiaddress: Value must be empty for markers")
else:
res.data.finish()
ok(res)
of None:
raiseAssert "None checked above"
proc init*(mtype: typedesc[MultiAddress], protocol: MultiCodec,
value: PeerID): MaResult[MultiAddress] {.inline.} =
## Initialize MultiAddress object from protocol id ``protocol`` and peer id
## ``value``.
init(mtype, protocol, value.data)
proc init*(mtype: typedesc[MultiAddress], protocol: MultiCodec,
value: int): MaResult[MultiAddress] =
## Initialize MultiAddress object from protocol id ``protocol`` and integer
## ``value``. This procedure can be used to instantiate ``tcp``, ``udp``,
## ``dccp`` and ``sctp`` MultiAddresses.
var allowed = [multiCodec("tcp"), multiCodec("udp"), multiCodec("dccp"),
multiCodec("sctp")]
if protocol notin allowed:
err("multiaddress: Incorrect protocol for integer value")
else:
let proto = CodeAddresses.getOrDefault(protocol)
var res: MultiAddress
res.data = initVBuffer()
res.data.writeVarint(cast[uint64](proto.mcodec))
if value < 0 or value > 65535:
err("multiaddress: Incorrect integer value")
else:
res.data.writeArray(toBytesBE(cast[uint16](value)))
res.data.finish()
ok(res)
proc getProtocol(name: string): MAProtocol {.inline.} =
let mc = MultiCodec.codec(name)
if mc != InvalidMultiCodec:
result = CodeAddresses.getOrDefault(mc)
proc init*(mtype: typedesc[MultiAddress],
value: string): MaResult[MultiAddress] =
## Initialize MultiAddress object from string representation ``value``.
var parts = value.trimRight('/').split('/')
if len(parts[0]) != 0:
err("multiaddress: Invalid MultiAddress, must start with `/`")
else:
var offset = 1
var res: MultiAddress
res.data = initVBuffer()
while offset < len(parts):
let part = parts[offset]
let proto = getProtocol(part)
if proto.kind == None:
return err("multiaddress: Unsupported protocol '" & part & "'")
else:
if proto.kind in {Fixed, Length, Path}:
if isNil(proto.coder.stringToBuffer):
return err("multiaddress: Missing protocol '" &
part & "' transcoder")
if offset + 1 >= len(parts):
return err("multiaddress: Missing protocol '" & part & "' argument")
if proto.kind in {Fixed, Length}:
res.data.write(proto.mcodec)
let res = proto.coder.stringToBuffer(parts[offset + 1], res.data)
if not res:
return err("multiaddress: Error encoding `" & part & "/" &
parts[offset + 1] & "`")
offset += 2
elif proto.kind == Path:
var path = "/" & (parts[(offset + 1)..^1].join("/"))
res.data.write(proto.mcodec)
if not proto.coder.stringToBuffer(path, res.data):
return err("multiaddress: Error encoding `" & part & "/" &
path & "`")
break
elif proto.kind == Marker:
res.data.write(proto.mcodec)
offset += 1
res.data.finish()
ok(res)
proc init*(mtype: typedesc[MultiAddress],
data: openarray[byte]): MaResult[MultiAddress] =
## Initialize MultiAddress with array of bytes ``data``.
if len(data) == 0:
err("multiaddress: Address could not be empty!")
else:
var res: MultiAddress
res.data = initVBuffer()
res.data.buffer.setLen(len(data))
copyMem(addr res.data.buffer[0], unsafeAddr data[0], len(data))
if not res.validate():
err("multiaddress: Incorrect MultiAddress!")
else:
ok(res)
proc init*(mtype: typedesc[MultiAddress]): MultiAddress =
## Initialize empty MultiAddress.
result.data = initVBuffer()
proc init*(mtype: typedesc[MultiAddress], address: ValidIpAddress,
protocol: IpTransportProtocol, port: Port): MultiAddress =
var res: MultiAddress
res.data = initVBuffer()
let
networkProto = case address.family
of IpAddressFamily.IPv4: getProtocol("ip4")
of IpAddressFamily.IPv6: getProtocol("ip6")
transportProto = case protocol
of tcpProtocol: getProtocol("tcp")
of udpProtocol: getProtocol("udp")
res.data.write(networkProto.mcodec)
case address.family
of IpAddressFamily.IPv4: res.data.writeArray(address.address_v4)
of IpAddressFamily.IPv6: res.data.writeArray(address.address_v6)
res.data.write(transportProto.mcodec)
res.data.writeArray(toBytesBE(uint16(port)))
res.data.finish()
res
proc init*(mtype: typedesc[MultiAddress], address: TransportAddress,
protocol = IPPROTO_TCP): MaResult[MultiAddress] =
## Initialize MultiAddress using chronos.TransportAddress (IPv4/IPv6/Unix)
## and protocol information (UDP/TCP).
var res: MultiAddress
res.data = initVBuffer()
let protoProto = case protocol
of IPPROTO_TCP: getProtocol("tcp")
of IPPROTO_UDP: getProtocol("udp")
else: default(MAProtocol)
if protoProto.size == 0:
return err("multiaddress: protocol should be either TCP or UDP")
if address.family == AddressFamily.IPv4:
res.data.write(getProtocol("ip4").mcodec)
res.data.writeArray(address.address_v4)
res.data.write(protoProto.mcodec)
discard protoProto.coder.stringToBuffer($address.port, res.data)
elif address.family == AddressFamily.IPv6:
res.data.write(getProtocol("ip6").mcodec)
res.data.writeArray(address.address_v6)
res.data.write(protoProto.mcodec)
discard protoProto.coder.stringToBuffer($address.port, res.data)
elif address.family == AddressFamily.Unix:
res.data.write(getProtocol("unix").mcodec)
res.data.writeSeq(address.address_un)
res.data.finish()
ok(res)
proc isEmpty*(ma: MultiAddress): bool =
## Returns ``true``, if MultiAddress ``ma`` is empty or non initialized.
result = len(ma.data) == 0
proc concat*(m1, m2: MultiAddress): MaResult[MultiAddress] =
var res: MultiAddress
res.data = initVBuffer()
res.data.buffer = m1.data.buffer & m2.data.buffer
if not res.validate():
err("multiaddress: Incorrect MultiAddress!")
else:
ok(res)
proc append*(m1: var MultiAddress, m2: MultiAddress): MaResult[void] =
m1.data.buffer &= m2.data.buffer
if not m1.validate():
err("multiaddress: Incorrect MultiAddress!")
else:
ok()
proc `&`*(m1, m2: MultiAddress): MultiAddress {.
raises: [Defect, LPError].} =
## Concatenates two addresses ``m1`` and ``m2``, and returns result.
##
## This procedure performs validation of concatenated result and can raise
## exception on error.
##
concat(m1, m2).tryGet()
proc `&=`*(m1: var MultiAddress, m2: MultiAddress) {.
raises: [Defect, LPError].} =
## Concatenates two addresses ``m1`` and ``m2``.
##
## This procedure performs validation of concatenated result and can raise
## exception on error.
##
m1.append(m2).tryGet()
proc `==`*(m1: var MultiAddress, m2: MultiAddress): bool =
## Check of two MultiAddress are equal
m1.data == m2.data
proc isWire*(ma: MultiAddress): bool =
## Returns ``true`` if MultiAddress ``ma`` is one of:
## - {IP4}/{TCP, UDP}
## - {IP6}/{TCP, UDP}
## - {UNIX}/{PATH}
var state = 0
const
wireProtocols = toHashSet([
multiCodec("ip4"), multiCodec("ip6"),
])
wireTransports = toHashSet([
multiCodec("tcp"), multiCodec("udp")
])
try:
for rpart in ma.items():
if rpart.isErr():
return false
let part = rpart.get()
if state == 0:
let rcode = part.protoCode()
if rcode.isErr():
return false
let code = rcode.get()
if code in wireProtocols:
inc(state)
continue
elif code == multiCodec("unix"):
result = true
break
else:
result = false
break
elif state == 1:
let rcode = part.protoCode()
if rcode.isErr():
return false
let code = rcode.get()
if code in wireTransports:
inc(state)
result = true
else:
result = false
break
else:
result = false
break
except:
result = false
proc matchPart(pat: MaPattern, protos: seq[MultiCodec]): MaPatResult =
var empty: seq[MultiCodec]
var pcs = protos
if pat.operator == Or:
result = MaPatResult(flag: false, rem: empty)
for a in pat.args:
let res = a.matchPart(pcs)
if res.flag:
#Greedy Or
if result.flag == false or
result.rem.len > res.rem.len:
result = res
elif pat.operator == And:
if len(pcs) < len(pat.args):
return MaPatResult(flag: false, rem: empty)
for i in 0..<len(pat.args):
let res = pat.args[i].matchPart(pcs)
if not res.flag:
return MaPatResult(flag: false, rem: res.rem)
pcs = res.rem
result = MaPatResult(flag: true, rem: pcs)
elif pat.operator == Eq:
if len(pcs) == 0:
return MaPatResult(flag: false, rem: empty)
if pcs[0] == pat.value:
return MaPatResult(flag: true, rem: pcs[1..^1])
result = MaPatResult(flag: false, rem: empty)
proc match*(pat: MaPattern, address: MultiAddress): bool =
## Match full ``address`` using pattern ``pat`` and return ``true`` if
## ``address`` satisfies pattern.
let protos = address.protocols()
if protos.isErr():
return false
let res = matchPart(pat, protos.get())
res.flag and (len(res.rem) == 0)
proc matchPartial*(pat: MaPattern, address: MultiAddress): bool =
## Match prefix part of ``address`` using pattern ``pat`` and return
## ``true`` if ``address`` starts with pattern.
let protos = address.protocols()
if protos.isErr():
return false
let res = matchPart(pat, protos.get())
res.flag
proc `$`*(pat: MaPattern): string =
## Return pattern ``pat`` as string.
var sub = newSeq[string]()
for a in pat.args:
sub.add($a)
if pat.operator == And:
result = sub.join("/")
elif pat.operator == Or:
result = "(" & sub.join("|") & ")"
elif pat.operator == Eq:
result = $pat.value
proc write*(pb: var ProtoBuffer, field: int, value: MultiAddress) {.inline.} =
write(pb, field, value.data.buffer)
proc getField*(pb: var ProtoBuffer, field: int,
value: var MultiAddress): ProtoResult[bool] {.
inline.} =
var buffer: seq[byte]
let res = ? pb.getField(field, buffer)
if not(res):
ok(false)
else:
let ma = MultiAddress.init(buffer)
if ma.isOk():
value = ma.get()
ok(true)
else:
err(ProtoError.IncorrectBlob)
proc getRepeatedField*(pb: var ProtoBuffer, field: int,
value: var seq[MultiAddress]): ProtoResult[bool] {.
inline.} =
var items: seq[seq[byte]]
value.setLen(0)
let res = ? pb.getRepeatedField(field, items)
if not(res):
ok(false)
else:
for item in items:
let ma = MultiAddress.init(item)
if ma.isOk():
value.add(ma.get())
else:
value.setLen(0)
return err(ProtoError.IncorrectBlob)
ok(true)
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