73 lines
1.6 KiB
Rust
73 lines
1.6 KiB
Rust
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use std::marker::PhantomData;
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use tonic::codec::{Codec, Decoder, Encoder, DecodeBuf, EncodeBuf};
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use bytes::{Buf, BufMut};
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use roto_runtime::RotoMessage;
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pub struct RotoCodec<T, U> {
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_phantom: PhantomData<(T, U)>,
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}
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impl<T, U> Default for RotoCodec<T, U> {
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fn default() -> Self {
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Self {
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_phantom: PhantomData,
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}
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}
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}
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impl<T, U> Codec for RotoCodec<T, U>
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where
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T: RotoMessage + Send + 'static,
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U: RotoMessage + Send + 'static,
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{
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type Encode = U;
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type Decode = T;
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type Encoder = RotoEncoder<U>;
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type Decoder = RotoDecoder<T>;
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fn encoder(&mut self) -> Self::Encoder {
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RotoEncoder(PhantomData)
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}
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fn decoder(&mut self) -> Self::Decoder {
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RotoDecoder(PhantomData)
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}
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}
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pub struct RotoEncoder<U>(PhantomData<U>);
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impl<U> Encoder for RotoEncoder<U>
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where
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U: RotoMessage,
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{
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type Item = U;
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type Error = tonic::Status;
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fn encode(&mut self, message: Self::Item, buf: &mut EncodeBuf<'_>) -> Result<(), Self::Error> {
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buf.put_slice(&message.bytes());
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Ok(())
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}
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}
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pub struct RotoDecoder<T>(PhantomData<T>);
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impl<T> Decoder for RotoDecoder<T>
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where
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T: RotoMessage,
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{
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type Item = T;
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type Error = tonic::Status;
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fn decode(&mut self, buf: &mut DecodeBuf<'_>) -> Result<Option<Self::Item>, Self::Error> {
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if buf.remaining() == 0 {
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return Ok(None);
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}
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let bytes = buf.copy_to_bytes(buf.remaining());
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match T::decode(bytes) {
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Ok(msg) => Ok(Some(msg)),
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Err(e) => Err(tonic::Status::internal(format!("Roto decode error: {}", e))),
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}
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}
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}
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