upgraded dependencies (tokio, bytes, protobuf)

rewrote the server routine to use async-await, as tokio 0.2 requires it
(encoder/decoder are now in tokio_util crate; used tokio sync Mutex instead of std)
added a panic hook, as otherwise the runtime may hang if internal app panics.
as there's no way for apps to be signalled that connection dropped,
there's an explicit panic now (so the app can restart from the committed state)

CHANGELOG.md

@@ -1,5 +1,13 @@
 # CHANGELOG
 
+_July 23, 2020_
+
+## v0.7.2
+
+### IMPROVEMENTS:
+
+- [\#138](https://github.com/tendermint/rust-abci/pull/138): dependencies upgrades (protobuf to 2.16.2, tokio to 0.2, bytes to 0.5)
+
 _June 30, 2020_
 
 ## v0.7.1

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "abci"
-version = "0.7.1"
+version = "0.7.2"
 authors = ["Adrian Brink <adrian@brink-holdings.com>", "Jackson Lewis <st.japa6@gmail.com>", "Dave Bryson", "Tomas Tauber"]
 edition = "2018"
 license = "MIT/Apache-2.0"
@@ -12,14 +12,15 @@ readme = "README.md"
 include = ["src/**/*", "Cargo.toml"]
 
 [dependencies]
-bytes = "0.4"
-protobuf = "= 2.15.1"
+bytes = "0.5"
+protobuf = "= 2.16.2"
 byteorder = "1.3.4"
 integer-encoding = "1.1.5"
 log = "0.4.8"
 env_logger = "0.7.1"
-tokio = { version = "0.1", default-features = false, features = ["codec", "io", "tcp", "rt-full"] }
+tokio = { version = "0.2", features = ["tcp", "rt-core", "io-driver", "sync"] }
+tokio-util = { version = "0.3.1", features = ["codec"] }
 futures = "0.3"
 
 [build-dependencies]
-protobuf-codegen-pure = "= 2.15.1"
+protobuf-codegen-pure = "= 2.16.2"

Makefile

@@ -1,5 +1,5 @@
 # Origin
-version_branch = v0.33.5
+version_branch = v0.33.6
 tendermint = https://raw.githubusercontent.com/tendermint/tendermint/$(version_branch)
 
 # Outputs

README.md

@@ -33,7 +33,7 @@ To use this library to build your own ABCI apps in Rust you have to include the
 
 ```toml
 [dependencies]
-abci = "0.7.1"
+abci = "0.7.2"
 ```
 
 ### Development
@@ -65,6 +65,7 @@ For a real life example of an ABCI application you can checkout [Cosmos SDK](htt
 
 | Tendermint | Rust-abci |
 | ---------- | :-------: |
+| 0.33.6     |   0.7.2   |
 | 0.33.5     |   0.7.1   |
 | 0.33.1     |   0.7.0   |
 | 0.32.9     |   0.6.5   |

src/codec.rs

@@ -1,9 +1,7 @@
-use std::error::Error;
-
-use bytes::{BufMut, BytesMut};
+use bytes::{buf::BufMutExt, BufMut, BytesMut};
 use integer_encoding::VarInt;
-use protobuf::Message;
-use tokio::codec::{Decoder, Encoder};
+use protobuf::{Message, ProtobufError};
+use tokio_util::codec::{Decoder, Encoder};
 
 use crate::messages::abci::*;
 
@@ -18,9 +16,9 @@ impl ABCICodec {
 
 impl Decoder for ABCICodec {
     type Item = Request;
-    type Error = Box<dyn Error>;
+    type Error = ProtobufError;
 
-    fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<Request>, Box<dyn Error>> {
+    fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<Request>, ProtobufError> {
         let length = buf.len();
         if length == 0 {
             return Ok(None);
@@ -30,16 +28,15 @@ impl Decoder for ABCICodec {
             return Ok(None);
         }
         let request = protobuf::parse_from_bytes(&buf[varint.1..(varint.0 as usize + varint.1)])?;
-        buf.split_to(varint.0 as usize + varint.1);
+        let _ = buf.split_to(varint.0 as usize + varint.1);
         Ok(Some(request))
     }
 }
 
-impl Encoder for ABCICodec {
-    type Item = Response;
-    type Error = Box<dyn Error>;
+impl Encoder<Response> for ABCICodec {
+    type Error = ProtobufError;
 
-    fn encode(&mut self, msg: Response, buf: &mut BytesMut) -> Result<(), Box<dyn Error>> {
+    fn encode(&mut self, msg: Response, buf: &mut BytesMut) -> Result<(), ProtobufError> {
         let msg_len = msg.compute_size();
         let varint = i64::encode_var_vec(i64::from(msg_len));
 
@@ -49,7 +46,7 @@ impl Encoder for ABCICodec {
             buf.reserve(needed);
         }
 
-        buf.put(&varint);
+        buf.put(varint.as_ref());
         msg.write_to_writer(&mut buf.writer())?;
         trace!("Encode response! {:?}", &buf[..]);
         Ok(())
@@ -59,9 +56,10 @@ impl Encoder for ABCICodec {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use std::error::Error;
 
     fn setup_echo_request_buf() -> Result<BytesMut, Box<dyn Error>> {
-        let buf = &mut BytesMut::new();
+        let mut buf = BytesMut::new();
 
         let mut r = Request::new();
         let mut echo = RequestEcho::new();
@@ -70,16 +68,16 @@ mod tests {
 
         let msg_len = r.compute_size();
         let varint = i64::encode_var_vec(msg_len as i64);
-        buf.put(varint);
-        r.write_to_writer(&mut buf.writer())?;
+        buf.put(varint.as_ref());
+        r.write_to_writer(&mut (&mut buf).writer())?;
 
         trace!("Encode response! {:?}", &buf[..]);
 
-        Ok(buf.take())
+        Ok(buf)
     }
 
     fn setup_echo_large_request_buf() -> Result<BytesMut, Box<dyn Error>> {
-        let buf = &mut BytesMut::new();
+        let mut buf = BytesMut::new();
 
         let mut r = Request::new();
         let mut echo = RequestEcho::new();
@@ -96,12 +94,12 @@ mod tests {
             buf.reserve(needed);
         }
 
-        buf.put(varint);
-        r.write_to_writer(&mut buf.writer())?;
+        buf.put(varint.as_ref());
+        r.write_to_writer(&mut (&mut buf).writer())?;
 
         trace!("Encode response! {:?}", &buf[..]);
 
-        Ok(buf.take())
+        Ok(buf)
     }
 
     #[test]