Brandon Williams
81 lines
2.1 KiB
Rust
81 lines
2.1 KiB
Rust
//! This module defines common request/response types as well as the JsonCodec that is used by the
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//! json.helloworld.Greeter service which is defined manually (instead of via proto files) by the
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//! `build_json_codec_service` function in the `examples/build.rs` file.
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use bytes::{Buf, BufMut};
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use serde::{Deserialize, Serialize};
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use std::marker::PhantomData;
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use tonic::{
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codec::{Codec, DecodeBuf, Decoder, EncodeBuf, Encoder},
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Status,
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};
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#[derive(Debug, Deserialize, Serialize)]
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pub struct HelloRequest {
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pub name: String,
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}
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#[derive(Debug, Deserialize, Serialize)]
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pub struct HelloResponse {
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pub message: String,
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}
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#[derive(Debug)]
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pub struct JsonEncoder<T>(PhantomData<T>);
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impl<T: serde::Serialize> Encoder for JsonEncoder<T> {
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type Item = T;
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type Error = Status;
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fn encode(&mut self, item: Self::Item, buf: &mut EncodeBuf<'_>) -> Result<(), Self::Error> {
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serde_json::to_writer(buf.writer(), &item).map_err(|e| Status::internal(e.to_string()))
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}
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}
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#[derive(Debug)]
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pub struct JsonDecoder<U>(PhantomData<U>);
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impl<U: serde::de::DeserializeOwned> Decoder for JsonDecoder<U> {
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type Item = U;
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type Error = Status;
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fn decode(&mut self, buf: &mut DecodeBuf<'_>) -> Result<Option<Self::Item>, Self::Error> {
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if !buf.has_remaining() {
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return Ok(None);
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}
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let item: Self::Item =
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serde_json::from_reader(buf.reader()).map_err(|e| Status::internal(e.to_string()))?;
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Ok(Some(item))
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}
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}
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/// A [`Codec`] that implements `application/grpc+json` via the serde library.
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#[derive(Debug, Clone)]
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pub struct JsonCodec<T, U>(PhantomData<(T, U)>);
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impl<T, U> Default for JsonCodec<T, U> {
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fn default() -> Self {
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Self(PhantomData)
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}
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}
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impl<T, U> Codec for JsonCodec<T, U>
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where
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T: serde::Serialize + Send + 'static,
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U: serde::de::DeserializeOwned + Send + 'static,
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{
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type Encode = T;
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type Decode = U;
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type Encoder = JsonEncoder<T>;
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type Decoder = JsonDecoder<U>;
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fn encoder(&mut self) -> Self::Encoder {
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JsonEncoder(PhantomData)
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}
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fn decoder(&mut self) -> Self::Decoder {
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JsonDecoder(PhantomData)
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}
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}
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