roto/examples/hello_world/proto/hello.rs

// @generated by protoc-gen-roto — do not edit
#[allow(unused_imports)]
use roto_runtime::{ProtoAccessor, ProtoBuilder, Result, RotoError, read_varint, RepeatedFieldIterator, RotoMessage};
use core::str;
#[cfg(feature = "alloc")]
use bytes::{Bytes, BytesMut, Buf, BufMut};

pub struct HelloRequest<'a> {
    accessor: roto_runtime::ProtoAccessor<'a>,
    name_offset: Option<usize>,
}

impl<'a> HelloRequest<'a> {
    pub fn new(data: &'a [u8]) -> roto_runtime::Result<Self> {
        let accessor = roto_runtime::ProtoAccessor::new(data)?;
        let mut name_offset = None;
        for item in accessor.fields() {
            let (offset, tag, _) = item?;
            if tag.field_number == 1 { name_offset = Some(offset); }
        }

        Ok(Self {
            accessor,
name_offset,
        })
    }

    pub fn name(&self) -> roto_runtime::Result<&'a str> {
        let offset = self.name_offset.ok_or(roto_runtime::RotoError::FieldNotFound)?;
        let (bytes, _) = self.accessor.get_value_at(offset)?;
        core::str::from_utf8(bytes).map_err(|_| roto_runtime::RotoError::WireFormatViolation)
    }

    pub fn name_or_default(&self) -> roto_runtime::Result<&'a str> {
        self.name().or(Ok(""))
    }

    pub fn has_name(&self) -> bool { self.name_offset.is_some() }

    pub fn raw_fields(&self) -> roto_runtime::RawFieldIterator<'a> {
        self.accessor.raw_fields()
    }

}

pub struct HelloRequestBuilder<'b> {
    builder: roto_runtime::ProtoBuilder<'b>,
    name_written: bool,
}

impl<'b> HelloRequestBuilder<'b> {
    pub fn builder(buf: &mut [u8]) -> HelloRequestBuilder<'_> {
        HelloRequestBuilder {
            builder: roto_runtime::ProtoBuilder::new(buf),
            name_written: false,
        }
    }

    pub fn name(mut self, value: &str) -> roto_runtime::Result<Self> {
        self.builder.write_string(1, value)?;
        self.name_written = true;
        Ok(self)
    }

    pub fn with(mut self, msg: &HelloRequest<'_>) -> roto_runtime::Result<Self> {
        for item in msg.accessor.raw_fields() {
            let (field_number, raw_bytes) = item?;
            let is_written = match field_number {
                1 => self.name_written,
                _ => false,
            };
            if !is_written {
                self.builder.write_raw(raw_bytes)?;
            }
        }
        Ok(self)
    }

    pub fn finish(self) -> roto_runtime::Result<&'b mut [u8]> {
        self.builder.finish()
    }
}

#[cfg(feature = "alloc")]
pub struct OwnedHelloRequest {
    pub data: bytes::Bytes,
}

#[cfg(feature = "alloc")]
impl roto_runtime::RotoOwned for OwnedHelloRequest {
    type Reader<'a> = HelloRequest<'a>;
    fn reader(&self) -> HelloRequest<'_> {
        HelloRequest::new(&self.data).expect("failed to create reader")
    }
}

#[cfg(feature = "alloc")]
impl roto_runtime::RotoMessage for OwnedHelloRequest {
    fn decode(buf: bytes::Bytes) -> roto_runtime::Result<Self> {
        Ok(OwnedHelloRequest { data: buf })
    }

    fn bytes(&self) -> bytes::Bytes {
        self.data.clone()
    }
}

pub struct HelloResponse<'a> {
    accessor: roto_runtime::ProtoAccessor<'a>,
    message_offset: Option<usize>,
}

impl<'a> HelloResponse<'a> {
    pub fn new(data: &'a [u8]) -> roto_runtime::Result<Self> {
        let accessor = roto_runtime::ProtoAccessor::new(data)?;
        let mut message_offset = None;
        for item in accessor.fields() {
            let (offset, tag, _) = item?;
            if tag.field_number == 1 { message_offset = Some(offset); }
        }

        Ok(Self {
            accessor,
message_offset,
        })
    }

    pub fn message(&self) -> roto_runtime::Result<&'a str> {
        let offset = self.message_offset.ok_or(roto_runtime::RotoError::FieldNotFound)?;
        let (bytes, _) = self.accessor.get_value_at(offset)?;
        core::str::from_utf8(bytes).map_err(|_| roto_runtime::RotoError::WireFormatViolation)
    }

    pub fn message_or_default(&self) -> roto_runtime::Result<&'a str> {
        self.message().or(Ok(""))
    }

    pub fn has_message(&self) -> bool { self.message_offset.is_some() }

    pub fn raw_fields(&self) -> roto_runtime::RawFieldIterator<'a> {
        self.accessor.raw_fields()
    }

}

pub struct HelloResponseBuilder<'b> {
    builder: roto_runtime::ProtoBuilder<'b>,
    message_written: bool,
}

impl<'b> HelloResponseBuilder<'b> {
    pub fn builder(buf: &mut [u8]) -> HelloResponseBuilder<'_> {
        HelloResponseBuilder {
            builder: roto_runtime::ProtoBuilder::new(buf),
            message_written: false,
        }
    }

    pub fn message(mut self, value: &str) -> roto_runtime::Result<Self> {
        self.builder.write_string(1, value)?;
        self.message_written = true;
        Ok(self)
    }

    pub fn with(mut self, msg: &HelloResponse<'_>) -> roto_runtime::Result<Self> {
        for item in msg.accessor.raw_fields() {
            let (field_number, raw_bytes) = item?;
            let is_written = match field_number {
                1 => self.message_written,
                _ => false,
            };
            if !is_written {
                self.builder.write_raw(raw_bytes)?;
            }
        }
        Ok(self)
    }

    pub fn finish(self) -> roto_runtime::Result<&'b mut [u8]> {
        self.builder.finish()
    }
}

#[cfg(feature = "alloc")]
pub struct OwnedHelloResponse {
    pub data: bytes::Bytes,
}

#[cfg(feature = "alloc")]
impl roto_runtime::RotoOwned for OwnedHelloResponse {
    type Reader<'a> = HelloResponse<'a>;
    fn reader(&self) -> HelloResponse<'_> {
        HelloResponse::new(&self.data).expect("failed to create reader")
    }
}

#[cfg(feature = "alloc")]
impl roto_runtime::RotoMessage for OwnedHelloResponse {
    fn decode(buf: bytes::Bytes) -> roto_runtime::Result<Self> {
        Ok(OwnedHelloResponse { data: buf })
    }

    fn bytes(&self) -> bytes::Bytes {
        self.data.clone()
    }
}



#[cfg(feature = "alloc")]
use tonic::{Request, Response, Status};
#[cfg(feature = "alloc")]
use tokio_stream::Stream;
#[cfg(feature = "alloc")]
use std::pin::Pin;
#[cfg(feature = "alloc")]
use std::sync::Arc;
#[cfg(feature = "alloc")]
use std::task::{Context, Poll};
#[cfg(feature = "alloc")]
use std::future::Future;
#[cfg(feature = "alloc")]
use tonic::body::BoxBody;
#[cfg(feature = "alloc")]
use tower::Service;
#[cfg(feature = "alloc")]
use futures_util::StreamExt;
#[cfg(feature = "alloc")]
use http_body_util::BodyExt;
#[cfg(feature = "alloc")]
use http_body::Body;
#[cfg(feature = "alloc")]
use crate::{BufferPool, StatusBody};

#[cfg(feature = "alloc")]
#[async_trait::async_trait]
pub trait HelloWorldService: Send + Sync + 'static {
    async fn hello_world(&self, request: Request<OwnedHelloRequest>) -> std::result::Result<Response<OwnedHelloResponse>, Status>;
}

#[cfg(feature = "alloc")]
#[derive(Clone)]
pub struct HelloWorldServiceServer {
    inner: Arc<dyn HelloWorldService>,
    pool: Arc<BufferPool>,
}

#[cfg(feature = "alloc")]
impl HelloWorldServiceServer {
    pub fn new(inner: Arc<dyn HelloWorldService>, pool: Arc<BufferPool>) -> Self {
        Self { inner, pool }
    }
}

#[cfg(feature = "alloc")]
impl tonic::server::NamedService for HelloWorldServiceServer {
    const NAME: &'static str = "hello.HelloWorldService";
}

#[cfg(feature = "alloc")]
impl Service<http::Request<BoxBody>> for HelloWorldServiceServer {
    type Response = http::Response<BoxBody>;
    type Error = std::convert::Infallible;
    type Future = Pin<Box<dyn Future<Output = std::result::Result<Self::Response, Self::Error>> + Send>>;

    fn poll_ready(&mut self, _: &mut Context<'_>) -> Poll<std::result::Result<(), Self::Error>> {
        Poll::Ready(Ok(()))
    }

    fn call(&mut self, req: http::Request<BoxBody>) -> Self::Future {
        let inner = self.inner.clone();
        let pool = self.pool.clone();
        Box::pin(async move {
            let path = req.uri().path().to_string();
            let body = req.into_body();
            let mut buf = pool.get();
            let mut stream = body;
            while let Some(frame_result) = stream.frame().await {
                let frame = frame_result.expect("Body frame error");
                if let Some(data) = frame.data_ref() {
                    buf.put(data.clone());
                }
            }

            let total_len = buf.len();
            let bytes_vec = buf.split_to(total_len).freeze();
            pool.put(buf);
            if bytes_vec.len() < 5 {
                let res_body = BoxBody::new(StatusBody::new(Some(Bytes::from_static(&[0, 0, 0, 0, 0])), 0));
                return Ok(http::Response::builder().status(200).body(res_body).unwrap());
            }

            let payload = bytes_vec.slice(5..);
            let mut routed = false;

            if path == "/hello.HelloWorldService/HelloWorld" {
                let request_msg = match OwnedHelloRequest::decode(payload) {
                    Ok(msg) => msg,
                    Err(e) => {
                        let res_body = BoxBody::new(StatusBody::new(Some(Bytes::from_static(&[0, 0, 0, 0, 0])), 0));
                        return Ok(http::Response::builder().status(200).body(res_body).unwrap());
                    }
                };

                let response = match inner.hello_world(Request::new(request_msg)).await {
                    Ok(res) => res,
                    Err(e) => {
                        let res_body = BoxBody::new(StatusBody::new(Some(Bytes::from_static(&[0, 0, 0, 0, 0])), 0));
                        return Ok(http::Response::builder().status(200).body(res_body).unwrap());
                    }
                };

                let response_msg = response.into_inner();
                let response_bytes = response_msg.bytes();
                let mut res_buf = pool.get();
                res_buf.put_u8(0);
                let len = response_bytes.len() as u32;
                res_buf.put_slice(&len.to_be_bytes());
                res_buf.put_slice(&response_bytes);
                let frame_len = res_buf.len();
                let frame = res_buf.split_to(frame_len).freeze();
                pool.put(res_buf);
                let res_body = BoxBody::new(StatusBody::new(Some(frame), 0));
                routed = true;
                return Ok(http::Response::builder().status(200).header("content-type", "application/grpc").body(res_body).unwrap());
            }
            if !routed {
                let res_body = BoxBody::new(StatusBody::new(Some(Bytes::from_static(&[0, 0, 0, 0, 0])), 0));
                return Ok(http::Response::builder().status(200).body(res_body).unwrap());
            }
            Ok(http::Response::builder().status(200).body(BoxBody::new(StatusBody::new(None, 0))).unwrap())
        })
    }
}