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pub mod codec;
mod decode;
mod encode;
mod flags;
mod payload;
mod u24;
mod version;
mod visit;
pub use self::decode::{Decode, DecodeError};
pub use self::encode::Encode;
pub use self::flags::{Flags, FrameType};
pub use self::payload::{
Data, Metadata, Payload, PayloadBuilder, PayloadChunks,
};
pub use self::u24::U24;
pub use self::version::Version;
use bytes::{Buf, BytesMut};
use codec::*;
use visit::*;
pub const MAX_U31: u32 = 0x7FFFFFFF;
pub const MAX_U63: u64 = 0x7FFF_FFFF_FFFF_FFFF;
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Frame {
Setup(SetupFrame),
Error(ErrorFrame),
Lease(LeaseFrame),
Keepalive(KeepaliveFrame),
RequestResponse(RequestResponseFrame),
RequestFnf(RequestFnfFrame),
RequestStream(RequestStreamFrame),
RequestChannel(RequestChannelFrame),
RequestN(RequestNFrame),
Cancel(CancelFrame),
Payload(PayloadFrame),
MetadataPush(MetadataPushFrame),
Resume(ResumeFrame),
ResumeOk(ResumeOkFrame),
}
impl Encode for Frame {
fn encode(&self, buf: &mut BytesMut) {
match self {
Frame::Setup(v) => v.encode(buf),
Frame::Error(v) => v.encode(buf),
Frame::Lease(v) => v.encode(buf),
Frame::Keepalive(v) => v.encode(buf),
Frame::RequestResponse(v) => v.encode(buf),
Frame::RequestFnf(v) => v.encode(buf),
Frame::RequestStream(v) => v.encode(buf),
Frame::RequestChannel(v) => v.encode(buf),
Frame::RequestN(v) => v.encode(buf),
Frame::Cancel(v) => v.encode(buf),
Frame::Payload(v) => v.encode(buf),
Frame::MetadataPush(v) => v.encode(buf),
Frame::Resume(v) => v.encode(buf),
Frame::ResumeOk(v) => v.encode(buf),
}
}
fn len(&self) -> usize {
match self {
Frame::Setup(v) => v.len(),
Frame::Error(v) => v.len(),
Frame::Lease(v) => v.len(),
Frame::Keepalive(v) => v.len(),
Frame::RequestResponse(v) => v.len(),
Frame::RequestFnf(v) => v.len(),
Frame::RequestStream(v) => v.len(),
Frame::RequestChannel(v) => v.len(),
Frame::RequestN(v) => v.len(),
Frame::Cancel(v) => v.len(),
Frame::Payload(v) => v.len(),
Frame::MetadataPush(v) => v.len(),
Frame::Resume(v) => v.len(),
Frame::ResumeOk(v) => v.len(),
}
}
}
impl Frame {
pub fn decode<B: Buf>(buf: &mut B) -> Result<Self> {
if buf.remaining() < 6 {
return Err(DecodeError::InComplete);
}
let stream_id = eat_stream_id(buf)?;
let (frame_type, flags) = eat_flags(buf)?;
match frame_type {
FrameType::SETUP
| FrameType::LEASE
| FrameType::KEEPALIVE
| FrameType::METADATA_PUSH
| FrameType::RESUME
| FrameType::RESUME_OK => {
if stream_id != 0 {
return Err(DecodeError::InvalidStreamId {
expected: "0",
found: stream_id,
});
}
}
_ => (),
}
Ok(match frame_type {
FrameType::SETUP => {
Frame::Setup(SetupFrame::decode(buf, stream_id, flags)?)
}
FrameType::ERROR => {
Frame::Error(ErrorFrame::decode(buf, stream_id, flags)?)
}
FrameType::LEASE => {
Frame::Lease(LeaseFrame::decode(buf, stream_id, flags)?)
}
FrameType::KEEPALIVE => Frame::Keepalive(KeepaliveFrame::decode(
buf, stream_id, flags,
)?),
FrameType::REQUEST_RESPONSE => Frame::RequestResponse(
RequestResponseFrame::decode(buf, stream_id, flags)?,
),
FrameType::REQUEST_FNF => Frame::RequestFnf(
RequestFnfFrame::decode(buf, stream_id, flags)?,
),
FrameType::REQUEST_STREAM => Frame::RequestStream(
RequestStreamFrame::decode(buf, stream_id, flags)?,
),
FrameType::REQUEST_CHANNEL => Frame::RequestChannel(
RequestChannelFrame::decode(buf, stream_id, flags)?,
),
FrameType::REQUEST_N => {
Frame::RequestN(RequestNFrame::decode(buf, stream_id, flags)?)
}
FrameType::CANCEL => {
Frame::Cancel(CancelFrame::decode(buf, stream_id, flags)?)
}
FrameType::PAYLOAD => {
Frame::Payload(PayloadFrame::decode(buf, stream_id, flags)?)
}
FrameType::METADATA_PUSH => Frame::MetadataPush(
MetadataPushFrame::decode(buf, stream_id, flags)?,
),
FrameType::RESUME => {
Frame::Resume(ResumeFrame::decode(buf, stream_id, flags)?)
}
FrameType::RESUME_OK => {
Frame::ResumeOk(ResumeOkFrame::decode(buf, stream_id, flags)?)
}
FrameType::EXT => {
unimplemented!()
}
})
}
}
#[cfg(test)]
mod tests {
use super::*;
use bytes::Bytes;
#[test]
fn test_max_u31() {
assert_eq!(MAX_U31, u32::MAX >> 1);
}
#[test]
fn test_max_63() {
assert_eq!(MAX_U63, u64::MAX >> 1);
}
#[test]
fn test_frame_decode() {
let f = RequestFnfFrame::new(
1,
true,
Payload::builder()
.set_metadata(Bytes::from("metadata"))
.set_data(Bytes::from("data"))
.build(),
);
let mut buf = BytesMut::new();
f.encode(&mut buf);
let mut buf = buf.freeze();
let decoded = Frame::decode(&mut buf).unwrap();
assert_eq!(decoded, Frame::RequestFnf(f));
}
}