/rust/registry/src/index.crates.io-6f17d22bba15001f/tonic-0.10.2/src/server/grpc.rs

Source (jump to first uncovered line)
use crate::codec::compression::{
    CompressionEncoding, EnabledCompressionEncodings, SingleMessageCompressionOverride,
};
use crate::{
    body::BoxBody,
    codec::{encode_server, Codec, Streaming},
    server::{ClientStreamingService, ServerStreamingService, StreamingService, UnaryService},
    Code, Request, Status,
};
use http_body::Body;
use std::fmt;
use tokio_stream::{Stream, StreamExt};

macro_rules! t {
    ($result:expr) => {
        match $result {
            Ok(value) => value,
            Err(status) => return status.to_http(),
        }
    };
}

/// A gRPC Server handler.
///
/// This will wrap some inner [`Codec`] and provide utilities to handle
/// inbound unary, client side streaming, server side streaming, and
/// bi-directional streaming.
///
/// Each request handler method accepts some service that implements the
/// corresponding service trait and a http request that contains some body that
/// implements some [`Body`].
pub struct Grpc<T> {
    codec: T,
    /// Which compression encodings does the server accept for requests?
    accept_compression_encodings: EnabledCompressionEncodings,
    /// Which compression encodings might the server use for responses.
    send_compression_encodings: EnabledCompressionEncodings,
    /// Limits the maximum size of a decoded message.
    max_decoding_message_size: Option<usize>,
    /// Limits the maximum size of an encoded message.
    max_encoding_message_size: Option<usize>,
}

impl<T> Grpc<T>
where
    T: Codec,
{
    /// Creates a new gRPC server with the provided [`Codec`].
    pub fn new(codec: T) -> Self {
        Self {
            codec,
            accept_compression_encodings: EnabledCompressionEncodings::default(),
            send_compression_encodings: EnabledCompressionEncodings::default(),
            max_decoding_message_size: None,
            max_encoding_message_size: None,
        }
    }

    /// Enable accepting compressed requests.
    ///
    /// If a request with an unsupported encoding is received the server will respond with
    /// [`Code::UnUnimplemented`](crate::Code).
    ///
    /// # Example
    ///
    /// The most common way of using this is through a server generated by tonic-build:
    ///
    /// ```rust
    /// # enum CompressionEncoding { Gzip }
    /// # struct Svc;
    /// # struct ExampleServer<T>(T);
    /// # impl<T> ExampleServer<T> {
    /// #     fn new(svc: T) -> Self { Self(svc) }
    /// #     fn accept_compressed(self, _: CompressionEncoding) -> Self { self }
    /// # }
    /// # #[tonic::async_trait]
    /// # trait Example {}
    ///
    /// #[tonic::async_trait]
    /// impl Example for Svc {
    ///     // ...
    /// }
    ///
    /// let service = ExampleServer::new(Svc).accept_compressed(CompressionEncoding::Gzip);
    /// ```
    pub fn accept_compressed(mut self, encoding: CompressionEncoding) -> Self {
        self.accept_compression_encodings.enable(encoding);
        self
    }

    /// Enable sending compressed responses.
    ///
    /// Requires the client to also support receiving compressed responses.
    ///
    /// # Example
    ///
    /// The most common way of using this is through a server generated by tonic-build:
    ///
    /// ```rust
    /// # enum CompressionEncoding { Gzip }
    /// # struct Svc;
    /// # struct ExampleServer<T>(T);
    /// # impl<T> ExampleServer<T> {
    /// #     fn new(svc: T) -> Self { Self(svc) }
    /// #     fn send_compressed(self, _: CompressionEncoding) -> Self { self }
    /// # }
    /// # #[tonic::async_trait]
    /// # trait Example {}
    ///
    /// #[tonic::async_trait]
    /// impl Example for Svc {
    ///     // ...
    /// }
    ///
    /// let service = ExampleServer::new(Svc).send_compressed(CompressionEncoding::Gzip);
    /// ```
    pub fn send_compressed(mut self, encoding: CompressionEncoding) -> Self {
        self.send_compression_encodings.enable(encoding);
        self
    }

    /// Limits the maximum size of a decoded message.
    ///
    /// # Example
    ///
    /// The most common way of using this is through a server generated by tonic-build:
    ///
    /// ```rust
    /// # struct Svc;
    /// # struct ExampleServer<T>(T);
    /// # impl<T> ExampleServer<T> {
    /// #     fn new(svc: T) -> Self { Self(svc) }
    /// #     fn max_decoding_message_size(self, _: usize) -> Self { self }
    /// # }
    /// # #[tonic::async_trait]
    /// # trait Example {}
    ///
    /// #[tonic::async_trait]
    /// impl Example for Svc {
    ///     // ...
    /// }
    ///
    /// // Set the limit to 2MB, Defaults to 4MB.
    /// let limit = 2 * 1024 * 1024;
    /// let service = ExampleServer::new(Svc).max_decoding_message_size(limit);
    /// ```
    pub fn max_decoding_message_size(mut self, limit: usize) -> Self {
        self.max_decoding_message_size = Some(limit);
        self
    }

    /// Limits the maximum size of a encoded message.
    ///
    /// # Example
    ///
    /// The most common way of using this is through a server generated by tonic-build:
    ///
    /// ```rust
    /// # struct Svc;
    /// # struct ExampleServer<T>(T);
    /// # impl<T> ExampleServer<T> {
    /// #     fn new(svc: T) -> Self { Self(svc) }
    /// #     fn max_encoding_message_size(self, _: usize) -> Self { self }
    /// # }
    /// # #[tonic::async_trait]
    /// # trait Example {}
    ///
    /// #[tonic::async_trait]
    /// impl Example for Svc {
    ///     // ...
    /// }
    ///
    /// // Set the limit to 2MB, Defaults to 4MB.
    /// let limit = 2 * 1024 * 1024;
    /// let service = ExampleServer::new(Svc).max_encoding_message_size(limit);
    /// ```
    pub fn max_encoding_message_size(mut self, limit: usize) -> Self {
        self.max_encoding_message_size = Some(limit);
        self
    }

    #[doc(hidden)]
    pub fn apply_compression_config(
        self,
        accept_encodings: EnabledCompressionEncodings,
        send_encodings: EnabledCompressionEncodings,
    ) -> Self {
        let mut this = self;

        for &encoding in CompressionEncoding::encodings() {
            if accept_encodings.is_enabled(encoding) {
                this = this.accept_compressed(encoding);
            }
            if send_encodings.is_enabled(encoding) {
                this = this.send_compressed(encoding);
            }
        }

        this
    }

    #[doc(hidden)]
    pub fn apply_max_message_size_config(
        self,
        max_decoding_message_size: Option<usize>,
        max_encoding_message_size: Option<usize>,
    ) -> Self {
        let mut this = self;

        if let Some(limit) = max_decoding_message_size {
            this = this.max_decoding_message_size(limit);
        }
        if let Some(limit) = max_encoding_message_size {
            this = this.max_encoding_message_size(limit);
        }

        this
    }

    /// Handle a single unary gRPC request.
    pub async fn unary<S, B>(
        &mut self,
        mut service: S,
        req: http::Request<B>,
    ) -> http::Response<BoxBody>
    where
        S: UnaryService<T::Decode, Response = T::Encode>,
        B: Body + Send + 'static,
        B::Error: Into<crate::Error> + Send,
    {
        let accept_encoding = CompressionEncoding::from_accept_encoding_header(
            req.headers(),
            self.send_compression_encodings,
        );

        let request = match self.map_request_unary(req).await {
            Ok(r) => r,
            Err(status) => {
                return self.map_response::<tokio_stream::Once<Result<T::Encode, Status>>>(
                    Err(status),
                    accept_encoding,
                    SingleMessageCompressionOverride::default(),
                    self.max_encoding_message_size,
                );
            }
        };

        let response = service
            .call(request)
            .await
            .map(|r| r.map(|m| tokio_stream::once(Ok(m))));

        let compression_override = compression_override_from_response(&response);

        self.map_response(
            response,
            accept_encoding,
            compression_override,
            self.max_encoding_message_size,
        )
    }

    /// Handle a server side streaming request.
    pub async fn server_streaming<S, B>(
        &mut self,
        mut service: S,
        req: http::Request<B>,
    ) -> http::Response<BoxBody>
    where
        S: ServerStreamingService<T::Decode, Response = T::Encode>,
        S::ResponseStream: Send + 'static,
        B: Body + Send + 'static,
        B::Error: Into<crate::Error> + Send,
    {
        let accept_encoding = CompressionEncoding::from_accept_encoding_header(
            req.headers(),
            self.send_compression_encodings,
        );

        let request = match self.map_request_unary(req).await {
            Ok(r) => r,
            Err(status) => {
                return self.map_response::<S::ResponseStream>(
                    Err(status),
                    accept_encoding,
                    SingleMessageCompressionOverride::default(),
                    self.max_encoding_message_size,
                );
            }
        };

        let response = service.call(request).await;

        self.map_response(
            response,
            accept_encoding,
            // disabling compression of individual stream items must be done on
            // the items themselves
            SingleMessageCompressionOverride::default(),
            self.max_encoding_message_size,
        )
    }

    /// Handle a client side streaming gRPC request.
    pub async fn client_streaming<S, B>(
        &mut self,
        mut service: S,
        req: http::Request<B>,
    ) -> http::Response<BoxBody>
    where
        S: ClientStreamingService<T::Decode, Response = T::Encode>,
        B: Body + Send + 'static,
        B::Error: Into<crate::Error> + Send + 'static,
    {
        let accept_encoding = CompressionEncoding::from_accept_encoding_header(
            req.headers(),
            self.send_compression_encodings,
        );

        let request = t!(self.map_request_streaming(req));

        let response = service
            .call(request)
            .await
            .map(|r| r.map(|m| tokio_stream::once(Ok(m))));

        let compression_override = compression_override_from_response(&response);

        self.map_response(
            response,
            accept_encoding,
            compression_override,
            self.max_encoding_message_size,
        )
    }

    /// Handle a bi-directional streaming gRPC request.
    pub async fn streaming<S, B>(
        &mut self,
        mut service: S,
        req: http::Request<B>,
    ) -> http::Response<BoxBody>
    where
        S: StreamingService<T::Decode, Response = T::Encode> + Send,
        S::ResponseStream: Send + 'static,
        B: Body + Send + 'static,
        B::Error: Into<crate::Error> + Send,
    {
        let accept_encoding = CompressionEncoding::from_accept_encoding_header(
            req.headers(),
            self.send_compression_encodings,
        );

        let request = t!(self.map_request_streaming(req));

        let response = service.call(request).await;

        self.map_response(
            response,
            accept_encoding,
            SingleMessageCompressionOverride::default(),
            self.max_encoding_message_size,
        )
    }

    async fn map_request_unary<B>(
        &mut self,
        request: http::Request<B>,
    ) -> Result<Request<T::Decode>, Status>
    where
        B: Body + Send + 'static,
        B::Error: Into<crate::Error> + Send,
    {
        let request_compression_encoding = self.request_encoding_if_supported(&request)?;

        let (parts, body) = request.into_parts();

        let stream = Streaming::new_request(
            self.codec.decoder(),
            body,
            request_compression_encoding,
            self.max_decoding_message_size,
        );

        tokio::pin!(stream);

        let message = stream
            .try_next()
            .await?
            .ok_or_else(|| Status::new(Code::Internal, "Missing request message."))?;

        let mut req = Request::from_http_parts(parts, message);

        if let Some(trailers) = stream.trailers().await? {
            req.metadata_mut().merge(trailers);
        }

        Ok(req)
    }

    fn map_request_streaming<B>(
        &mut self,
        request: http::Request<B>,
    ) -> Result<Request<Streaming<T::Decode>>, Status>
    where
        B: Body + Send + 'static,
        B::Error: Into<crate::Error> + Send,
    {
        let encoding = self.request_encoding_if_supported(&request)?;

        let request = request.map(|body| {
            Streaming::new_request(
                self.codec.decoder(),
                body,
                encoding,
                self.max_decoding_message_size,
            )
        });

        Ok(Request::from_http(request))
    }

    fn map_response<B>(
        &mut self,
        response: Result<crate::Response<B>, Status>,
        accept_encoding: Option<CompressionEncoding>,
        compression_override: SingleMessageCompressionOverride,
        max_message_size: Option<usize>,
    ) -> http::Response<BoxBody>
    where
        B: Stream<Item = Result<T::Encode, Status>> + Send + 'static,
    {
        let response = match response {
            Ok(r) => r,
            Err(status) => return status.to_http(),
        };

        let (mut parts, body) = response.into_http().into_parts();

        // Set the content type
        parts.headers.insert(
            http::header::CONTENT_TYPE,
            http::header::HeaderValue::from_static("application/grpc"),
        );

        if let Some(encoding) = accept_encoding {
            // Set the content encoding
            parts.headers.insert(
                crate::codec::compression::ENCODING_HEADER,
                encoding.into_header_value(),
            );
        }

        let body = encode_server(
            self.codec.encoder(),
            body,
            accept_encoding,
            compression_override,
            max_message_size,
        );

        http::Response::from_parts(parts, BoxBody::new(body))
    }

    fn request_encoding_if_supported<B>(
        &self,
        request: &http::Request<B>,
    ) -> Result<Option<CompressionEncoding>, Status> {
        CompressionEncoding::from_encoding_header(
            request.headers(),
            self.accept_compression_encodings,
        )
    }
}

impl<T: fmt::Debug> fmt::Debug for Grpc<T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut f = f.debug_struct("Grpc");

        f.field("codec", &self.codec);

        f.field(
            "accept_compression_encodings",
            &self.accept_compression_encodings,
        );

        f.field(
            "send_compression_encodings",
            &self.send_compression_encodings,
        );

        f.finish()
    }
}

fn compression_override_from_response<B, E>(
    res: &Result<crate::Response<B>, E>,
) -> SingleMessageCompressionOverride {
    res.as_ref()
        .ok()
        .and_then(|response| {
            response
                .extensions()
                .get::<SingleMessageCompressionOverride>()
                .copied()
        })
        .unwrap_or_default()
}

Coverage Report

Created: 2024-12-17 06:15

Line	Count	Source (jump to first uncovered line)
1		use crate::codec::compression::{
2		CompressionEncoding, EnabledCompressionEncodings, SingleMessageCompressionOverride,
3		};
4		use crate::{
5		body::BoxBody,
6		codec::{encode_server, Codec, Streaming},
7		server::{ClientStreamingService, ServerStreamingService, StreamingService, UnaryService},
8		Code, Request, Status,
9		};
10		use http_body::Body;
11		use std::fmt;
12		use tokio_stream::{Stream, StreamExt};
13
14		macro_rules! t {
15		($result:expr) => {
16		match $result {
17		Ok(value) => value,
18		Err(status) => return status.to_http(),
19		}
20		};
21		}
22
23		/// A gRPC Server handler.
24		///
25		/// This will wrap some inner [`Codec`] and provide utilities to handle
26		/// inbound unary, client side streaming, server side streaming, and
27		/// bi-directional streaming.
28		///
29		/// Each request handler method accepts some service that implements the
30		/// corresponding service trait and a http request that contains some body that
31		/// implements some [`Body`].
32		pub struct Grpc<T> {
33		codec: T,
34		/// Which compression encodings does the server accept for requests?
35		accept_compression_encodings: EnabledCompressionEncodings,
36		/// Which compression encodings might the server use for responses.
37		send_compression_encodings: EnabledCompressionEncodings,
38		/// Limits the maximum size of a decoded message.
39		max_decoding_message_size: Option<usize>,
40		/// Limits the maximum size of an encoded message.
41		max_encoding_message_size: Option<usize>,
42		}
43
44		impl<T> Grpc<T>
45		where
46		T: Codec,
47		{
48		/// Creates a new gRPC server with the provided [`Codec`].
49	0	pub fn new(codec: T) -> Self {
50	0	Self {
51	0	codec,
52	0	accept_compression_encodings: EnabledCompressionEncodings::default(),
53	0	send_compression_encodings: EnabledCompressionEncodings::default(),
54	0	max_decoding_message_size: None,
55	0	max_encoding_message_size: None,
56	0	}
57	0	}
58
59		/// Enable accepting compressed requests.
60		///
61		/// If a request with an unsupported encoding is received the server will respond with
62		/// [`Code::UnUnimplemented`](crate::Code).
63		///
64		/// # Example
65		///
66		/// The most common way of using this is through a server generated by tonic-build:
67		///
68		/// ```rust
69		/// # enum CompressionEncoding { Gzip }
70		/// # struct Svc;
71		/// # struct ExampleServer<T>(T);
72		/// # impl<T> ExampleServer<T> {
73		/// # fn new(svc: T) -> Self { Self(svc) }
74		/// # fn accept_compressed(self, _: CompressionEncoding) -> Self { self }
75		/// # }
76		/// # #[tonic::async_trait]
77		/// # trait Example {}
78		///
79		/// #[tonic::async_trait]
80		/// impl Example for Svc {
81		/// // ...
82		/// }
83		///
84		/// let service = ExampleServer::new(Svc).accept_compressed(CompressionEncoding::Gzip);
85		/// ```
86	0	pub fn accept_compressed(mut self, encoding: CompressionEncoding) -> Self {
87	0	self.accept_compression_encodings.enable(encoding);
88	0	self
89	0	}
90
91		/// Enable sending compressed responses.
92		///
93		/// Requires the client to also support receiving compressed responses.
94		///
95		/// # Example
96		///
97		/// The most common way of using this is through a server generated by tonic-build:
98		///
99		/// ```rust
100		/// # enum CompressionEncoding { Gzip }
101		/// # struct Svc;
102		/// # struct ExampleServer<T>(T);
103		/// # impl<T> ExampleServer<T> {
104		/// # fn new(svc: T) -> Self { Self(svc) }
105		/// # fn send_compressed(self, _: CompressionEncoding) -> Self { self }
106		/// # }
107		/// # #[tonic::async_trait]
108		/// # trait Example {}
109		///
110		/// #[tonic::async_trait]
111		/// impl Example for Svc {
112		/// // ...
113		/// }
114		///
115		/// let service = ExampleServer::new(Svc).send_compressed(CompressionEncoding::Gzip);
116		/// ```
117	0	pub fn send_compressed(mut self, encoding: CompressionEncoding) -> Self {
118	0	self.send_compression_encodings.enable(encoding);
119	0	self
120	0	}
121
122		/// Limits the maximum size of a decoded message.
123		///
124		/// # Example
125		///
126		/// The most common way of using this is through a server generated by tonic-build:
127		///
128		/// ```rust
129		/// # struct Svc;
130		/// # struct ExampleServer<T>(T);
131		/// # impl<T> ExampleServer<T> {
132		/// # fn new(svc: T) -> Self { Self(svc) }
133		/// # fn max_decoding_message_size(self, _: usize) -> Self { self }
134		/// # }
135		/// # #[tonic::async_trait]
136		/// # trait Example {}
137		///
138		/// #[tonic::async_trait]
139		/// impl Example for Svc {
140		/// // ...
141		/// }
142		///
143		/// // Set the limit to 2MB, Defaults to 4MB.
144		/// let limit = 2 * 1024 * 1024;
145		/// let service = ExampleServer::new(Svc).max_decoding_message_size(limit);
146		/// ```
147	0	pub fn max_decoding_message_size(mut self, limit: usize) -> Self {
148	0	self.max_decoding_message_size = Some(limit);
149	0	self
150	0	}
151
152		/// Limits the maximum size of a encoded message.
153		///
154		/// # Example
155		///
156		/// The most common way of using this is through a server generated by tonic-build:
157		///
158		/// ```rust
159		/// # struct Svc;
160		/// # struct ExampleServer<T>(T);
161		/// # impl<T> ExampleServer<T> {
162		/// # fn new(svc: T) -> Self { Self(svc) }
163		/// # fn max_encoding_message_size(self, _: usize) -> Self { self }
164		/// # }
165		/// # #[tonic::async_trait]
166		/// # trait Example {}
167		///
168		/// #[tonic::async_trait]
169		/// impl Example for Svc {
170		/// // ...
171		/// }
172		///
173		/// // Set the limit to 2MB, Defaults to 4MB.
174		/// let limit = 2 * 1024 * 1024;
175		/// let service = ExampleServer::new(Svc).max_encoding_message_size(limit);
176		/// ```
177	0	pub fn max_encoding_message_size(mut self, limit: usize) -> Self {
178	0	self.max_encoding_message_size = Some(limit);
179	0	self
180	0	}
181
182		#[doc(hidden)]
183	0	pub fn apply_compression_config(
184	0	self,
185	0	accept_encodings: EnabledCompressionEncodings,
186	0	send_encodings: EnabledCompressionEncodings,
187	0	) -> Self {
188	0	let mut this = self;
189
190	0	for &encoding in CompressionEncoding::encodings() {
191	0	if accept_encodings.is_enabled(encoding) {
192	0	this = this.accept_compressed(encoding);
193	0	}
194	0	if send_encodings.is_enabled(encoding) {
195	0	this = this.send_compressed(encoding);
196	0	}
197		}
198
199	0	this
200	0	}
201
202		#[doc(hidden)]
203	0	pub fn apply_max_message_size_config(
204	0	self,
205	0	max_decoding_message_size: Option<usize>,
206	0	max_encoding_message_size: Option<usize>,
207	0	) -> Self {
208	0	let mut this = self;
209
210	0	if let Some(limit) = max_decoding_message_size {
211	0	this = this.max_decoding_message_size(limit);
212	0	}
213	0	if let Some(limit) = max_encoding_message_size {
214	0	this = this.max_encoding_message_size(limit);
215	0	}
216
217	0	this
218	0	}
219
220		/// Handle a single unary gRPC request.
221	0	pub async fn unary<S, B>(
222	0	&mut self,
223	0	mut service: S,
224	0	req: http::Request<B>,
225	0	) -> http::Response<BoxBody>
226	0	where
227	0	S: UnaryService<T::Decode, Response = T::Encode>,
228	0	B: Body + Send + 'static,
229	0	B::Error: Into<crate::Error> + Send,
230	0	{
231	0	let accept_encoding = CompressionEncoding::from_accept_encoding_header(
232	0	req.headers(),
233	0	self.send_compression_encodings,
234	0	);
235
236	0	let request = match self.map_request_unary(req).await {
237	0	Ok(r) => r,
238	0	Err(status) => {
239	0	return self.map_response::<tokio_stream::Once<Result<T::Encode, Status>>>(
240	0	Err(status),
241	0	accept_encoding,
242	0	SingleMessageCompressionOverride::default(),
243	0	self.max_encoding_message_size,
244	0	);
245		}
246		};
247
248	0	let response = service
249	0	.call(request)
250	0	.await
251	0	.map(\|r\| r.map(\|m\| tokio_stream::once(Ok(m))));
252	0
253	0	let compression_override = compression_override_from_response(&response);
254	0
255	0	self.map_response(
256	0	response,
257	0	accept_encoding,
258	0	compression_override,
259	0	self.max_encoding_message_size,
260	0	)
261	0	}
262
263		/// Handle a server side streaming request.
264	0	pub async fn server_streaming<S, B>(
265	0	&mut self,
266	0	mut service: S,
267	0	req: http::Request<B>,
268	0	) -> http::Response<BoxBody>
269	0	where
270	0	S: ServerStreamingService<T::Decode, Response = T::Encode>,
271	0	S::ResponseStream: Send + 'static,
272	0	B: Body + Send + 'static,
273	0	B::Error: Into<crate::Error> + Send,
274	0	{
275	0	let accept_encoding = CompressionEncoding::from_accept_encoding_header(
276	0	req.headers(),
277	0	self.send_compression_encodings,
278	0	);
279
280	0	let request = match self.map_request_unary(req).await {
281	0	Ok(r) => r,
282	0	Err(status) => {
283	0	return self.map_response::<S::ResponseStream>(
284	0	Err(status),
285	0	accept_encoding,
286	0	SingleMessageCompressionOverride::default(),
287	0	self.max_encoding_message_size,
288	0	);
289		}
290		};
291
292	0	let response = service.call(request).await;
293
294	0	self.map_response(
295	0	response,
296	0	accept_encoding,
297	0	// disabling compression of individual stream items must be done on
298	0	// the items themselves
299	0	SingleMessageCompressionOverride::default(),
300	0	self.max_encoding_message_size,
301	0	)
302	0	}
303
304		/// Handle a client side streaming gRPC request.
305	0	pub async fn client_streaming<S, B>(
306	0	&mut self,
307	0	mut service: S,
308	0	req: http::Request<B>,
309	0	) -> http::Response<BoxBody>
310	0	where
311	0	S: ClientStreamingService<T::Decode, Response = T::Encode>,
312	0	B: Body + Send + 'static,
313	0	B::Error: Into<crate::Error> + Send + 'static,
314	0	{
315	0	let accept_encoding = CompressionEncoding::from_accept_encoding_header(
316	0	req.headers(),
317	0	self.send_compression_encodings,
318	0	);
319
320	0	let request = t!(self.map_request_streaming(req));
321
322	0	let response = service
323	0	.call(request)
324	0	.await
325	0	.map(\|r\| r.map(\|m\| tokio_stream::once(Ok(m))));
326	0
327	0	let compression_override = compression_override_from_response(&response);
328	0
329	0	self.map_response(
330	0	response,
331	0	accept_encoding,
332	0	compression_override,
333	0	self.max_encoding_message_size,
334	0	)
335	0	}
336
337		/// Handle a bi-directional streaming gRPC request.
338	0	pub async fn streaming<S, B>(
339	0	&mut self,
340	0	mut service: S,
341	0	req: http::Request<B>,
342	0	) -> http::Response<BoxBody>
343	0	where
344	0	S: StreamingService<T::Decode, Response = T::Encode> + Send,
345	0	S::ResponseStream: Send + 'static,
346	0	B: Body + Send + 'static,
347	0	B::Error: Into<crate::Error> + Send,
348	0	{
349	0	let accept_encoding = CompressionEncoding::from_accept_encoding_header(
350	0	req.headers(),
351	0	self.send_compression_encodings,
352	0	);
353
354	0	let request = t!(self.map_request_streaming(req));
355
356	0	let response = service.call(request).await;
357
358	0	self.map_response(
359	0	response,
360	0	accept_encoding,
361	0	SingleMessageCompressionOverride::default(),
362	0	self.max_encoding_message_size,
363	0	)
364	0	}
365
366	0	async fn map_request_unary<B>(
367	0	&mut self,
368	0	request: http::Request<B>,
369	0	) -> Result<Request<T::Decode>, Status>
370	0	where
371	0	B: Body + Send + 'static,
372	0	B::Error: Into<crate::Error> + Send,
373	0	{
374	0	let request_compression_encoding = self.request_encoding_if_supported(&request)?;
375
376	0	let (parts, body) = request.into_parts();
377	0
378	0	let stream = Streaming::new_request(
379	0	self.codec.decoder(),
380	0	body,
381	0	request_compression_encoding,
382	0	self.max_decoding_message_size,
383	0	);
384	0
385	0	tokio::pin!(stream);
386
387	0	let message = stream
388	0	.try_next()
389	0	.await?
390	0	.ok_or_else(\|\| Status::new(Code::Internal, "Missing request message."))?;
391
392	0	let mut req = Request::from_http_parts(parts, message);
393
394	0	if let Some(trailers) = stream.trailers().await? {
395	0	req.metadata_mut().merge(trailers);
396	0	}
397
398	0	Ok(req)
399	0	}
400
401	0	fn map_request_streaming<B>(
402	0	&mut self,
403	0	request: http::Request<B>,
404	0	) -> Result<Request<Streaming<T::Decode>>, Status>
405	0	where
406	0	B: Body + Send + 'static,
407	0	B::Error: Into<crate::Error> + Send,
408	0	{
409	0	let encoding = self.request_encoding_if_supported(&request)?;
410
411	0	let request = request.map(\|body\| {
412	0	Streaming::new_request(
413	0	self.codec.decoder(),
414	0	body,
415	0	encoding,
416	0	self.max_decoding_message_size,
417	0	)
418	0	});
419	0
420	0	Ok(Request::from_http(request))
421	0	}
422
423	0	fn map_response<B>(
424	0	&mut self,
425	0	response: Result<crate::Response<B>, Status>,
426	0	accept_encoding: Option<CompressionEncoding>,
427	0	compression_override: SingleMessageCompressionOverride,
428	0	max_message_size: Option<usize>,
429	0	) -> http::Response<BoxBody>
430	0	where
431	0	B: Stream<Item = Result<T::Encode, Status>> + Send + 'static,
432	0	{
433	0	let response = match response {
434	0	Ok(r) => r,
435	0	Err(status) => return status.to_http(),
436		};
437
438	0	let (mut parts, body) = response.into_http().into_parts();
439	0
440	0	// Set the content type
441	0	parts.headers.insert(
442	0	http::header::CONTENT_TYPE,
443	0	http::header::HeaderValue::from_static("application/grpc"),
444	0	);
445
446	0	if let Some(encoding) = accept_encoding {
447	0	// Set the content encoding
448	0	parts.headers.insert(
449	0	crate::codec::compression::ENCODING_HEADER,
450	0	encoding.into_header_value(),
451	0	);
452	0	}
453
454	0	let body = encode_server(
455	0	self.codec.encoder(),
456	0	body,
457	0	accept_encoding,
458	0	compression_override,
459	0	max_message_size,
460	0	);
461	0
462	0	http::Response::from_parts(parts, BoxBody::new(body))
463	0	}
464
465	0	fn request_encoding_if_supported<B>(
466	0	&self,
467	0	request: &http::Request<B>,
468	0	) -> Result<Option<CompressionEncoding>, Status> {
469	0	CompressionEncoding::from_encoding_header(
470	0	request.headers(),
471	0	self.accept_compression_encodings,
472	0	)
473	0	}
474		}
475
476		impl<T: fmt::Debug> fmt::Debug for Grpc<T> {
477	0	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
478	0	let mut f = f.debug_struct("Grpc");
479	0
480	0	f.field("codec", &self.codec);
481	0
482	0	f.field(
483	0	"accept_compression_encodings",
484	0	&self.accept_compression_encodings,
485	0	);
486	0
487	0	f.field(
488	0	"send_compression_encodings",
489	0	&self.send_compression_encodings,
490	0	);
491	0
492	0	f.finish()
493	0	}
494		}
495
496	0	fn compression_override_from_response<B, E>(
497	0	res: &Result<crate::Response<B>, E>,
498	0	) -> SingleMessageCompressionOverride {
499	0	res.as_ref()
500	0	.ok()
501	0	.and_then(\|response\| {
502	0	response
503	0	.extensions()
504	0	.get::<SingleMessageCompressionOverride>()
505	0	.copied()
506	0	})
507	0	.unwrap_or_default()
508	0	}