nim-libp2p/libp2p/connection.nim

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## Nim-LibP2P
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## 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, chronicles, options
import peerinfo,
multiaddress,
stream/lpstream,
peerinfo,
varint,
vbuffer
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const DefaultReadSize*: uint = 64 * 1024
type
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Connection* = ref object of LPStream
peerInfo*: Option[PeerInfo]
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stream*: LPStream
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observedAddrs*: Multiaddress
InvalidVarintException = object of LPStreamError
proc newInvalidVarintException*(): ref InvalidVarintException =
newException(InvalidVarintException, "unable to prase varint")
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proc newConnection*(stream: LPStream): Connection =
## create a new Connection for the specified async reader/writer
new result
result.stream = stream
result.closeEvent = newAsyncEvent()
# bind stream's close event to connection's close
# to ensure correct close propagation
let this = result
if not isNil(result.stream.closeEvent):
result.stream.closeEvent.wait().
addCallback(
proc (udata: pointer) =
if not this.closed:
trace "closing this connection because wrapped stream closed"
asyncCheck this.close()
)
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method read*(s: Connection, n = -1): Future[seq[byte]] {.gcsafe.} =
s.stream.read(n)
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method readExactly*(s: Connection,
pbytes: pointer,
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nbytes: int):
Future[void] {.gcsafe.} =
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s.stream.readExactly(pbytes, nbytes)
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method readLine*(s: Connection,
limit = 0,
sep = "\r\n"):
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Future[string] {.gcsafe.} =
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s.stream.readLine(limit, sep)
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method readOnce*(s: Connection,
pbytes: pointer,
nbytes: int):
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Future[int] {.gcsafe.} =
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s.stream.readOnce(pbytes, nbytes)
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method readUntil*(s: Connection,
pbytes: pointer,
nbytes: int,
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sep: seq[byte]):
Future[int] {.gcsafe.} =
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s.stream.readUntil(pbytes, nbytes, sep)
method write*(s: Connection,
pbytes: pointer,
nbytes: int):
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Future[void] {.gcsafe.} =
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s.stream.write(pbytes, nbytes)
method write*(s: Connection,
msg: string,
msglen = -1):
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Future[void] {.gcsafe.} =
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s.stream.write(msg, msglen)
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method write*(s: Connection,
msg: seq[byte],
msglen = -1):
Future[void] {.gcsafe.} =
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s.stream.write(msg, msglen)
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method closed*(s: Connection): bool =
if isNil(s.stream):
return false
result = s.stream.closed
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method close*(s: Connection) {.async, gcsafe.} =
trace "closing connection"
if not s.closed:
if not isNil(s.stream) and not s.stream.closed:
await s.stream.close()
s.closeEvent.fire()
s.isClosed = true
trace "connection closed", closed = s.closed
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proc readLp*(s: Connection): Future[seq[byte]] {.async, gcsafe.} =
## read lenght prefixed msg
var
size: uint
length: int
res: VarintStatus
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result = newSeq[byte](10)
try:
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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()
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result.setLen(size)
if size > 0.uint:
trace "reading exact bytes from stream", size = size
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await s.readExactly(addr result[0], int(size))
except LPStreamIncompleteError as exc:
trace "remote connection ended unexpectedly", exc = exc.msg
except LPStreamReadError as exc:
trace "couldn't read from stream", exc = exc.msg
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proc writeLp*(s: Connection, msg: string | seq[byte]): Future[void] {.gcsafe.} =
## write lenght prefixed
var buf = initVBuffer()
buf.writeSeq(msg)
buf.finish()
s.write(buf.buffer)
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method getObservedAddrs*(c: Connection): Future[MultiAddress] {.base, async, gcsafe.} =
## get resolved multiaddresses for the connection
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result = c.observedAddrs
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proc `$`*(conn: Connection): string =
result = $(conn.peerInfo)