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use std::io::{self, Cursor};
use bytes::{Buf, BytesMut};
use fbthrift::{
binary_protocol::{BinaryProtocolDeserializer, BinaryProtocolSerializer},
ApplicationException, Deserialize, MessageType, ProtocolReader, ProtocolWriter, Serialize,
};
use fbthrift_transport_response_handler::ResponseHandler;
use nebula_fbthrift_graph::services::graph_service::{AuthenticateExn, ExecuteExn, SignoutExn};
#[derive(Clone)]
pub struct GraphTransportResponseHandler;
impl ResponseHandler for GraphTransportResponseHandler {
fn try_make_static_response_bytes(
&mut self,
_service_name: &'static str,
fn_name: &'static str,
request_bytes: &[u8],
) -> io::Result<Option<Vec<u8>>> {
match fn_name {
"GraphService.authenticate" => Ok(None),
"GraphService.signout" => {
let mut des = BinaryProtocolDeserializer::new(Cursor::new(request_bytes));
let (name, message_type, seqid) = des
.read_message_begin(|v| v.to_vec())
.map_err(|err| io::Error::new(io::ErrorKind::Other, err))?;
if name != b"signout" {
return Err(io::Error::new(
io::ErrorKind::Other,
format!("Unexpected name {:?}", name),
));
}
if message_type != MessageType::Call {
return Err(io::Error::new(
io::ErrorKind::Other,
format!("Unexpected message type {:?}", message_type),
));
}
let buf = BytesMut::with_capacity(1024);
let mut ser = BinaryProtocolSerializer::<BytesMut>::with_buffer(buf);
ser.write_message_begin("signout", MessageType::Reply, seqid);
ser.write_message_end();
SignoutExn::Success(()).write(&mut ser);
let res_buf = ser.finish().bytes().to_vec();
Ok(Some(res_buf))
}
"GraphService.execute" => Ok(None),
_ => Err(io::Error::new(
io::ErrorKind::Other,
format!("Unknown method {}", fn_name),
)),
}
}
fn parse_response_bytes(&mut self, response_bytes: &[u8]) -> io::Result<Option<usize>> {
let mut des = BinaryProtocolDeserializer::new(Cursor::new(response_bytes));
let (name, message_type, _) = match des.read_message_begin(|v| v.to_vec()) {
Ok(v) => v,
Err(_) => return Ok(None),
};
match &name[..] {
b"authenticate" => {}
b"signout" => unreachable!(),
b"execute" => {}
_ => return Ok(None),
};
match message_type {
MessageType::Reply => {
match &name[..] {
b"authenticate" => {
let _: AuthenticateExn = match Deserialize::read(&mut des) {
Ok(v) => v,
Err(_) => return Ok(None),
};
}
b"execute" => {
let _: ExecuteExn = match Deserialize::read(&mut des) {
Ok(v) => v,
Err(_) => return Ok(None),
};
}
_ => unreachable!(),
};
}
MessageType::Exception => {
let _: ApplicationException = match Deserialize::read(&mut des) {
Ok(v) => v,
Err(_) => return Ok(None),
};
}
MessageType::Call | MessageType::Oneway | MessageType::InvalidMessageType => {}
}
match des.read_message_end() {
Ok(v) => v,
Err(_) => return Ok(None),
};
Ok(Some(des.into_inner().position() as usize))
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::error;
#[test]
fn test_try_make_static_response_bytes() -> Result<(), Box<dyn error::Error>> {
let mut handler = GraphTransportResponseHandler;
assert_eq!(
handler.try_make_static_response_bytes(
"GraphService",
"GraphService.authenticate",
b"FOO"
)?,
None
);
assert_eq!(
handler.try_make_static_response_bytes(
"GraphService",
"GraphService.execute",
b"FOO"
)?,
None
);
match handler.try_make_static_response_bytes("GraphService", "GraphService.foo", b"FOO") {
Ok(_) => assert!(false),
Err(err) => {
assert_eq!(err.kind(), io::ErrorKind::Other);
assert_eq!(err.to_string(), "Unknown method GraphService.foo");
}
}
Ok(())
}
#[test]
fn test_try_make_static_response_bytes_with_signout() -> Result<(), Box<dyn error::Error>> {
let mut handler = GraphTransportResponseHandler;
let request = ::fbthrift::serialize!(::fbthrift::BinaryProtocol, |p| {
::fbthrift::protocol::write_message(
p,
"signout",
::fbthrift::MessageType::Call,
0,
|p| {
p.write_struct_begin("args");
p.write_field_begin("arg_sessionId", ::fbthrift::TType::I64, 1i16);
::fbthrift::Serialize::write(&1, p);
p.write_field_end();
p.write_field_stop();
p.write_struct_end();
},
)
});
match handler.try_make_static_response_bytes(
"GraphService",
"GraphService.signout",
request.bytes(),
) {
Ok(Some(_)) => {}
_ => assert!(false),
}
Ok(())
}
}