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| # Nim-WebRTC | ||
| # Copyright (c) 2024 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 | ||
| import usrsctp | ||
| import ./sctp_utils | ||
| import ../errors | ||
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| logScope: | ||
| topics = "webrtc sctp_connection" | ||
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| proc sctpStrerror(error: cint): cstring {.importc: "strerror", cdecl, header: "<string.h>".} | ||
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| type | ||
| SctpState = enum | ||
| Connecting | ||
| Connected | ||
| Closed | ||
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| SctpMessageParameters* = object | ||
| protocolId*: uint32 | ||
| streamId*: uint16 | ||
| endOfRecord*: bool | ||
| unordered*: bool | ||
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| SctpMessage* = ref object | ||
| data*: seq[byte] | ||
| info: sctp_recvv_rn | ||
| params*: SctpMessageParameters | ||
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| SctpConn* = ref object | ||
| conn*: DtlsConn | ||
| state: SctpState | ||
| connectEvent: AsyncEvent | ||
| acceptEvent: AsyncEvent | ||
| readLoop: Future[void] | ||
| udp: DatagramTransport | ||
| address: TransportAddress | ||
| sctpSocket: ptr socket | ||
| dataRecv: AsyncQueue[SctpMessage] | ||
| sentFuture: Future[void] | ||
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| proc new(T: typedesc[SctpConn], conn: DtlsConn): T = | ||
| T(conn: conn, | ||
| state: Connecting, | ||
| connectEvent: AsyncEvent(), | ||
| acceptEvent: AsyncEvent(), | ||
| dataRecv: newAsyncQueue[SctpMessage]() | ||
| ) | ||
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| proc read*(self: SctpConn): Future[SctpMessage] {.async.} = | ||
| # Used by DataChannel, returns SctpMessage in order to get the stream | ||
| # and protocol ids | ||
| return await self.dataRecv.popFirst() | ||
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| proc toFlags(params: SctpMessageParameters): uint16 = | ||
| if params.endOfRecord: | ||
| result = result or SCTP_EOR | ||
| if params.unordered: | ||
| result = result or SCTP_UNORDERED | ||
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| proc write*(self: SctpConn, buf: seq[byte], | ||
| sendParams = default(SctpMessageParameters)) {.async.} = | ||
| # Used by DataChannel, writes buf on the Dtls connection. | ||
| trace "Write", buf | ||
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| var cpy = buf | ||
| let sendvErr = | ||
| if sendParams == default(SctpMessageParameters): | ||
| # If writes is called by DataChannel, sendParams should never | ||
| # be the default value. This split is useful for testing. | ||
| self.usrsctpAwait: | ||
| self.sctpSocket.usrsctp_sendv(cast[pointer](addr cpy[0]), cpy.len().uint, nil, 0, | ||
| nil, 0, SCTP_SENDV_NOINFO.cuint, 0) | ||
| else: | ||
| var sendInfo = sctp_sndinfo( | ||
| snd_sid: sendParams.streamId, | ||
| snd_ppid: sendParams.protocolId.swapBytes(), | ||
| snd_flags: sendParams.toFlags) | ||
| self.usrsctpAwait: | ||
| self.sctpSocket.usrsctp_sendv(cast[pointer](addr cpy[0]), cpy.len().uint, nil, 0, | ||
| cast[pointer](addr sendInfo), sizeof(sendInfo).SockLen, | ||
| SCTP_SENDV_SNDINFO.cuint, 0) | ||
| if sendvErr < 0: | ||
| raise newException(WebRtcError, $(sctpStrerror(sendvErr))) | ||
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| proc write*(self: SctpConn, s: string) {.async.} = | ||
| await self.write(s.toBytes()) | ||
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| proc close*(self: SctpConn) {.async.} = | ||
| self.usrsctpAwait: | ||
| self.sctpSocket.usrsctp_close() | ||
| usrsctp_deregister_address(cast[pointer](self)) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| # Nim-WebRTC | ||
| # Copyright (c) 2024 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. | ||
|
|
||
| template usrsctpAwait*(self: untyped, body: untyped): untyped = | ||
| # usrsctpAwait is template which set `sentFuture` to nil then calls (usually) | ||
| # an usrsctp function. If during the synchronous run of the usrsctp function | ||
| # `sendCallback` is called, then `sentFuture` is set and waited. | ||
| # self should be Sctp or SctpConn | ||
| self.sentFuture = nil | ||
| when type(body) is void: | ||
| (body) | ||
| if self.sentFuture != nil: await self.sentFuture | ||
| else: | ||
| let res = (body) | ||
| if self.sentFuture != nil: await self.sentFuture | ||
| res |