mirror of https://github.com/vacp2p/nim-libp2p.git
121 lines
3.5 KiB
Nim
121 lines
3.5 KiB
Nim
## Nim-LibP2P
|
|
## Copyright (c) 2019 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.
|
|
|
|
import chronos, options, chronicles
|
|
import peerinfo,
|
|
multiaddress,
|
|
stream/lpstream,
|
|
peerinfo,
|
|
varint,
|
|
vbuffer
|
|
|
|
const DefaultReadSize*: uint = 64 * 1024
|
|
|
|
type
|
|
Connection* = ref object of LPStream
|
|
peerInfo*: PeerInfo
|
|
stream*: LPStream
|
|
observedAddrs*: Multiaddress
|
|
|
|
InvalidVarintException = object of LPStreamError
|
|
|
|
proc newInvalidVarintException*(): ref InvalidVarintException =
|
|
result = newException(InvalidVarintException, "unable to prase varint")
|
|
|
|
proc newConnection*(stream: LPStream): Connection =
|
|
## create a new Connection for the specified async reader/writer
|
|
new result
|
|
result.stream = stream
|
|
|
|
method read*(s: Connection, n = -1): Future[seq[byte]] {.gcsafe.} =
|
|
result = s.stream.read(n)
|
|
|
|
method readExactly*(s: Connection,
|
|
pbytes: pointer,
|
|
nbytes: int):
|
|
Future[void] {.gcsafe.} =
|
|
s.stream.readExactly(pbytes, nbytes)
|
|
|
|
method readLine*(s: Connection,
|
|
limit = 0,
|
|
sep = "\r\n"):
|
|
Future[string] {.gcsafe.} =
|
|
s.stream.readLine(limit, sep)
|
|
|
|
method readOnce*(s: Connection,
|
|
pbytes: pointer,
|
|
nbytes: int):
|
|
Future[int] {.gcsafe.} =
|
|
s.stream.readOnce(pbytes, nbytes)
|
|
|
|
method readUntil*(s: Connection,
|
|
pbytes: pointer,
|
|
nbytes: int,
|
|
sep: seq[byte]):
|
|
Future[int] {.gcsafe.} =
|
|
s.stream.readUntil(pbytes, nbytes, sep)
|
|
|
|
method write*(s: Connection,
|
|
pbytes: pointer,
|
|
nbytes: int):
|
|
Future[void] {.gcsafe.} =
|
|
s.stream.write(pbytes, nbytes)
|
|
|
|
method write*(s: Connection,
|
|
msg: string,
|
|
msglen = -1):
|
|
Future[void] {.gcsafe.} =
|
|
s.stream.write(msg, msglen)
|
|
|
|
method write*(s: Connection,
|
|
msg: seq[byte],
|
|
msglen = -1):
|
|
Future[void] {.gcsafe.} =
|
|
s.stream.write(msg, msglen)
|
|
|
|
method close*(s: Connection) {.async, gcsafe.} =
|
|
await s.stream.close()
|
|
s.closed = true
|
|
|
|
proc readLp*(s: Connection): Future[seq[byte]] {.async, gcsafe.} =
|
|
## read lenght prefixed msg
|
|
var
|
|
size: uint
|
|
length: int
|
|
res: VarintStatus
|
|
result = newSeq[byte](10)
|
|
try:
|
|
for i in 0..<len(result):
|
|
await s.readExactly(addr result[i], 1)
|
|
res = LP.getUVarint(result.toOpenArray(0, i), length, size)
|
|
if res == VarintStatus.Success:
|
|
break
|
|
if res != VarintStatus.Success or size > DefaultReadSize:
|
|
raise newInvalidVarintException()
|
|
result.setLen(size)
|
|
if size > 0.uint:
|
|
await s.readExactly(addr result[0], int(size))
|
|
except LPStreamIncompleteError, LPStreamReadError:
|
|
trace "remote connection closed", exc = getCurrentExceptionMsg()
|
|
|
|
proc writeLp*(s: Connection, msg: string | seq[byte]): Future[void] {.gcsafe.} =
|
|
## write lenght prefixed
|
|
var buf = initVBuffer()
|
|
buf.writeSeq(msg)
|
|
buf.finish()
|
|
result = s.write(buf.buffer)
|
|
|
|
method getObservedAddrs*(c: Connection): Future[MultiAddress] {.base, async, gcsafe.} =
|
|
## get resolved multiaddresses for the connection
|
|
result = c.observedAddrs
|
|
|
|
proc `$`*(conn: Connection): string =
|
|
if conn.peerInfo.peerId.isSome:
|
|
result = $(conn.peerInfo.peerId.get())
|