move protobuf support to the example

.travis.yml

@@ -78,7 +78,7 @@ script:
 after_success:
   - |
     if [[ "$TRAVIS_OS_NAME" == "linux" && "$TRAVIS_PULL_REQUEST" = "false" && "$TRAVIS_BRANCH" == "master" && "$TRAVIS_RUST_VERSION" == "nightly" ]]; then
-      cargo doc --features "alpn, tls, protobuf" --no-deps &&
+      cargo doc --features "alpn, tls" --no-deps &&
       echo "<meta http-equiv=refresh content=0;url=os_balloon/index.html>" > target/doc/index.html &&
       cargo install mdbook &&
       cd guide && mdbook build -d ../target/doc/guide && cd .. &&

Cargo.toml

@@ -38,9 +38,6 @@ alpn = ["openssl", "openssl/v102", "openssl/v110", "tokio-openssl"]
 # sessions
 session = ["cookie/secure"]
 
-# protobuf
-protobuf = ["prost"]
-
 [dependencies]
 actix = "^0.5.2"
 
@@ -90,9 +87,6 @@ tokio-tls = { version="0.1", optional = true }
 openssl = { version="0.10", optional = true }
 tokio-openssl = { version="0.2", optional = true }
 
-# protobuf
-prost = { version="^0.2", optional = true }
-
 [dev-dependencies]
 env_logger = "0.5"
 skeptic = "0.13"

examples/protobuf/Cargo.toml

@@ -6,10 +6,11 @@ authors = ["kingxsp <jin_hb_zh@126.com>"]
 [dependencies]
 bytes = "0.4"
 futures = "0.1"
+failure = "0.1"
 env_logger = "*"
 
 prost = "0.2.0"
 prost-derive = "0.2.0"
 
 actix = "0.5"
-actix-web = { path="../../", features=["protobuf"] }
+actix-web = { path="../../" }

examples/protobuf/src/main.rs

@@ -2,15 +2,19 @@ extern crate actix;
 extern crate actix_web;
 extern crate bytes;
 extern crate futures;
+#[macro_use]
+extern crate failure;
 extern crate env_logger;
 extern crate prost;
-#[macro_use] 
+#[macro_use]
 extern crate prost_derive;
 
 use actix_web::*;
-use actix_web::ProtoBufBody;
 use futures::Future;
 
+mod protobuf;
+use protobuf::ProtoBufResponseBuilder;
+
 
 #[derive(Clone, Debug, PartialEq, Message)]
 pub struct MyObj {
@@ -21,9 +25,9 @@ pub struct MyObj {
 }
 
 
-/// This handler uses `HttpRequest::json()` for loading serde json object.
+/// This handler uses `ProtoBufMessage` for loading protobuf object.
 fn index(req: HttpRequest) -> Box<Future<Item=HttpResponse, Error=Error>> {
-    ProtoBufBody::new(req)
+    protobuf::ProtoBufMessage::new(req)
         .from_err()  // convert all errors into `Error`
         .and_then(|val: MyObj| {
             println!("model: {:?}", val);

examples/protobuf/src/protobuf.rs

@@ -1,18 +1,17 @@
 use bytes::{Bytes, BytesMut};
 use futures::{Poll, Future, Stream};
-use http::header::{CONTENT_TYPE, CONTENT_LENGTH};
 
 use bytes::IntoBuf;
 use prost::Message;
-use prost::EncodeError as ProtoBufEncodeError;
 use prost::DecodeError as ProtoBufDecodeError;
+use prost::EncodeError as ProtoBufEncodeError;
+
+use actix_web::header::http::{CONTENT_TYPE, CONTENT_LENGTH};
+use actix_web::{Responder, HttpMessage, HttpRequest, HttpResponse};
+use actix_web::dev::HttpResponseBuilder;
+use actix_web::error::{Error, PayloadError, ResponseError};
+use actix_web::httpcodes::{HttpBadRequest, HttpPayloadTooLarge};
 
-use error::{Error, PayloadError, ResponseError};
-use handler::Responder;
-use httpmessage::HttpMessage;
-use httprequest::HttpRequest;
-use httpresponse::{HttpResponse, HttpResponseBuilder};
-use httpcodes::{HttpBadRequest, HttpPayloadTooLarge};
 
 #[derive(Fail, Debug)]
 pub enum ProtoBufPayloadError {
@@ -22,8 +21,11 @@ pub enum ProtoBufPayloadError {
     /// Content type error
     #[fail(display="Content type error")]
     ContentType,
+    /// Serialize error
+    #[fail(display="ProtoBud serialize error: {}", _0)]
+    Serialize(#[cause] ProtoBufEncodeError),
     /// Deserialize error
-    #[fail(display="Json deserialize error: {}", _0)]
+    #[fail(display="ProtoBud deserialize error: {}", _0)]
     Deserialize(#[cause] ProtoBufDecodeError),
     /// Payload error
     #[fail(display="Error that occur during reading payload: {}", _0)]
@@ -52,10 +54,6 @@ impl From<ProtoBufDecodeError> for ProtoBufPayloadError {
     }
 }
 
-/// `InternalServerError` for `ProtoBufEncodeError` `ProtoBufDecodeError`
-impl ResponseError for ProtoBufEncodeError {}
-impl ResponseError for ProtoBufDecodeError {}
-
 #[derive(Debug)]
 pub struct ProtoBuf<T: Message>(pub T);
 
@@ -66,28 +64,28 @@ impl<T: Message> Responder for ProtoBuf<T> {
     fn respond_to(self, _: HttpRequest) -> Result<HttpResponse, Error> {
         let mut buf = Vec::new();
         self.0.encode(&mut buf)
-              .map_err(Error::from)
-              .and_then(|()| {
+            .map_err(|e| Error::from(ProtoBufPayloadError::Serialize(e)))
+            .and_then(|()| {
                 Ok(HttpResponse::Ok()
-                    .content_type("application/protobuf")
+                   .content_type("application/protobuf")
                     .body(buf)
                     .into())
               })
     }
 }
 
-pub struct ProtoBufBody<T, U: Message + Default>{
+pub struct ProtoBufMessage<T, U: Message + Default>{
     limit: usize,
     ct: &'static str,
     req: Option<T>,
     fut: Option<Box<Future<Item=U, Error=ProtoBufPayloadError>>>,
 }
 
-impl<T, U: Message + Default> ProtoBufBody<T, U> {
+impl<T, U: Message + Default> ProtoBufMessage<T, U> {
 
-    /// Create `ProtoBufBody` for request.
+    /// Create `ProtoBufMessage` for request.
     pub fn new(req: T) -> Self {
-        ProtoBufBody{
+        ProtoBufMessage{
             limit: 262_144,
             req: Some(req),
             fut: None,
@@ -111,7 +109,7 @@ impl<T, U: Message + Default> ProtoBufBody<T, U> {
     }
 }
 
-impl<T, U: Message + Default + 'static> Future for ProtoBufBody<T, U>
+impl<T, U: Message + Default + 'static> Future for ProtoBufMessage<T, U>
     where T: HttpMessage + Stream<Item=Bytes, Error=PayloadError> + 'static
 {
     type Item = U;
@@ -154,13 +152,18 @@ impl<T, U: Message + Default + 'static> Future for ProtoBufBody<T, U>
 }
 
 
-impl HttpResponseBuilder {
+pub trait ProtoBufResponseBuilder {
 
-    pub fn protobuf<T: Message>(&mut self, value: T) -> Result<HttpResponse, Error> {
+    fn protobuf<T: Message>(&mut self, value: T) -> Result<HttpResponse, Error>;
+}
+
+impl ProtoBufResponseBuilder for HttpResponseBuilder {
+
+    fn protobuf<T: Message>(&mut self, value: T) -> Result<HttpResponse, Error> {
         self.header(CONTENT_TYPE, "application/protobuf");
 
         let mut body = Vec::new();
-        value.encode(&mut body)?;
+        value.encode(&mut body).map_err(|e| ProtoBufPayloadError::Serialize(e))?;
         Ok(self.body(body)?)
     }
 }

src/lib.rs

@@ -88,9 +88,6 @@ extern crate h2 as http2;
 extern crate trust_dns_resolver;
 #[macro_use] extern crate actix;
 
-#[cfg(feature="protobuf")]
-extern crate prost;
-
 #[cfg(test)]
 #[macro_use] extern crate serde_derive;
 
@@ -121,11 +118,6 @@ mod param;
 mod payload;
 mod pipeline;
 
-#[cfg(feature="protobuf")]
-mod protobuf;
-#[cfg(feature="protobuf")]
-pub use protobuf::{ProtoBuf, ProtoBufBody};
-
 pub mod client;
 pub mod fs;
 pub mod ws;