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96 lines
2.4 KiB
Rust
96 lines
2.4 KiB
Rust
use async_trait::async_trait;
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use futures::prelude::*;
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use libp2p::core::upgrade;
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use libp2p::request_response::{ProtocolName, RequestResponseCodec};
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use serde::de::DeserializeOwned;
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use serde::Serialize;
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use std::fmt::Debug;
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use std::io;
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use std::marker::PhantomData;
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/// Message receive buffer.
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pub const BUF_SIZE: usize = 1024 * 1024;
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/// A [`RequestResponseCodec`] for pull-based protocols where the response is
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/// encoded using JSON.
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///
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/// A pull-based protocol is a protocol where the dialer doesn't send any
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/// message and expects the listener to directly send the response as the
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/// substream is opened.
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#[derive(Clone, Copy, Debug)]
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pub struct JsonPullCodec<P, Res> {
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phantom: PhantomData<(P, Res)>,
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}
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impl<P, Res> Default for JsonPullCodec<P, Res> {
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fn default() -> Self {
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Self {
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phantom: PhantomData::default(),
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}
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}
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}
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#[async_trait]
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impl<P, Res> RequestResponseCodec for JsonPullCodec<P, Res>
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where
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P: ProtocolName + Send + Sync + Clone,
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Res: DeserializeOwned + Serialize + Send,
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{
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type Protocol = P;
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type Request = ();
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type Response = Res;
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async fn read_request<T>(&mut self, _: &Self::Protocol, _: &mut T) -> io::Result<Self::Request>
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where
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T: AsyncRead + Unpin + Send,
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{
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Ok(())
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}
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async fn read_response<T>(
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&mut self,
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_: &Self::Protocol,
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io: &mut T,
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) -> io::Result<Self::Response>
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where
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T: AsyncRead + Unpin + Send,
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{
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let message = upgrade::read_one(io, BUF_SIZE)
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.await
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.map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
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let mut de = serde_json::Deserializer::from_slice(&message);
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let msg = Res::deserialize(&mut de)
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.map_err(|error| io::Error::new(io::ErrorKind::InvalidData, error))?;
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Ok(msg)
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}
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async fn write_request<T>(
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&mut self,
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_: &Self::Protocol,
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_: &mut T,
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_: Self::Request,
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) -> io::Result<()>
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where
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T: AsyncWrite + Unpin + Send,
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{
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Ok(())
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}
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async fn write_response<T>(
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&mut self,
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_: &Self::Protocol,
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io: &mut T,
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res: Self::Response,
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) -> io::Result<()>
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where
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T: AsyncWrite + Unpin + Send,
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{
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let bytes = serde_json::to_vec(&res)
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.map_err(|error| io::Error::new(io::ErrorKind::InvalidData, error))?;
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upgrade::write_one(io, &bytes).await?;
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Ok(())
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}
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}
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