nim-libp2p-experimental/libp2p/connection.nim

100 lines
3.0 KiB
Nim

## 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.
import chronos
import peerinfo, multiaddress, stream, peerinfo, varint, vbuffer
const DefaultReadSize: uint = 64*1024
type
Connection* = ref object of LPStream
peerInfo*: PeerInfo
stream: LPStream
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]] {.async.} =
result = await s.stream.read(n)
method readExactly*(s: Connection,
pbytes: pointer,
nbytes: int): Future[void] {.async.} =
await s.stream.readExactly(pbytes, nbytes)
method readLine*(s: Connection,
limit = 0,
sep = "\r\n"): Future[string] {.async.} =
result = await s.stream.readLine(limit, sep)
method readOnce*(s: Connection,
pbytes: pointer,
nbytes: int): Future[int] {.async.} =
result = await s.stream.readOnce(pbytes, nbytes)
method readUntil*(s: Connection,
pbytes: pointer,
nbytes: int,
sep: seq[byte]): Future[int] {.async.} =
result = await s.stream.readUntil(pbytes, nbytes, sep)
method write*(s: Connection, pbytes: pointer, nbytes: int) {.async.} =
await s.stream.write(pbytes, nbytes)
method write*(s: Connection, msg: string, msglen = -1) {.async.} =
await s.stream.write(msg, msglen)
method write*(s: Connection, msg: seq[byte], msglen = -1) {.async.} =
await s.stream.write(msg, msglen)
method close*(s: Connection) {.async.} =
await s.stream.close()
s.closed = true
proc readLp*(s: Connection): Future[seq[byte]] {.async.} =
## read lenght prefixed msg
var
size: uint
length: int
res: VarintStatus
var buffer = newSeq[byte](10)
try:
for i in 0..<len(buffer):
await s.readExactly(addr buffer[i], 1)
res = LP.getUVarint(buffer.toOpenArray(0, i), length, size)
if res == VarintStatus.Success:
break
if res != VarintStatus.Success or size > DefaultReadSize:
buffer.setLen(0)
buffer.setLen(size)
await s.readExactly(addr buffer[0], int(size))
except TransportIncompleteError:
buffer.setLen(0)
result = buffer
proc writeLp*(s: Connection, msg: string | seq[byte]) {.async.} =
## write lenght prefixed
var buf = initVBuffer()
buf.writeSeq(msg)
buf.finish()
result = s.write(buf.buffer)
method getPeerInfo* (c: Connection): Future[PeerInfo] {.base, async.} =
## get up to date peer info
## TODO: implement PeerInfo refresh over identify
discard
method getObservedAddrs(c: Connection): Future[seq[MultiAddress]] {.base,
async.} =
## get resolved multiaddresses for the connection
discard