Add codec borsh feature

.changelog/unreleased/feature/259-add-borsh-and-scale-codec.md

@@ -0,0 +1,2 @@
+- Add serialization and deserialization features for codec and borsh to the host
+  type in ics24 ([#259](https://github.com/cosmos/ibc-rs/issues/259))

crates/ibc/Cargo.toml

@@ -37,6 +37,8 @@ std = [
     "tendermint/std",
 ]
 clock = ["tendermint/clock", "time/std"]
+parity-scale-codec = ["dep:parity-scale-codec", "dep:scale-info"]
+borsh = ["dep:borsh"]
 
 # This feature guards the unfinished implementation of ADR 5.
 val_exec_ctx = []
@@ -66,6 +68,11 @@ derive_more = { version = "0.99.17", default-features = false, features = ["from
 uint = { version = "0.9", default-features = false }
 primitive-types = { version = "0.12.0", default-features = false, features = ["serde_no_std"] }
 dyn-clone = "1.0.8"
+## for codec encode or decode
+parity-scale-codec = { version = "3.0.0", default-features = false, features = ["full"], optional = true }
+scale-info = { version = "2.1.2", default-features = false, features = ["derive"], optional = true }
+## for borsh encode or decode
+borsh = {version = "0.9.3", default-features = false, optional = true }
 
 [dependencies.tendermint]
 version = "0.28"

crates/ibc/src/core/ics02_client/client_type.rs

@@ -2,6 +2,18 @@ use crate::prelude::*;
 use core::fmt::{Display, Error as FmtError, Formatter};
 use serde_derive::{Deserialize, Serialize};
 
+#[cfg_attr(
+    feature = "parity-scale-codec",
+    derive(
+        parity_scale_codec::Encode,
+        parity_scale_codec::Decode,
+        scale_info::TypeInfo
+    )
+)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 /// Type of the client, depending on the specific consensus algorithm.
 #[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub struct ClientType(String);

crates/ibc/src/core/ics02_client/height.rs

@@ -12,6 +12,18 @@ use ibc_proto::ibc::core::client::v1::Height as RawHeight;
 
 use crate::core::ics02_client::error::ClientError;
 
+#[cfg_attr(
+    feature = "parity-scale-codec",
+    derive(
+        parity_scale_codec::Encode,
+        parity_scale_codec::Decode,
+        scale_info::TypeInfo
+    )
+)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 #[derive(Copy, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct Height {
     /// Previously known as "epoch"

crates/ibc/src/core/ics02_client/trust_threshold.rs

@@ -23,6 +23,18 @@ use crate::core::ics02_client::error::ClientError;
 /// A typical trust threshold is 1/3 in practice.
 /// This type accepts even a value of 0, (numerator = 0, denominator = 0),
 /// which is used in the client state of an upgrading client.
+#[cfg_attr(
+    feature = "parity-scale-codec",
+    derive(
+        parity_scale_codec::Encode,
+        parity_scale_codec::Decode,
+        scale_info::TypeInfo
+    )
+)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct TrustThreshold {
     numerator: u64,

crates/ibc/src/core/ics03_connection/connection.rs

@@ -23,6 +23,18 @@ use crate::core::ics24_host::error::ValidationError;
 use crate::core::ics24_host::identifier::{ClientId, ConnectionId};
 use crate::timestamp::ZERO_DURATION;
 
+#[cfg_attr(
+    feature = "parity-scale-codec",
+    derive(
+        parity_scale_codec::Encode,
+        parity_scale_codec::Decode,
+        scale_info::TypeInfo
+    )
+)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct IdentifiedConnectionEnd {
     pub connection_id: ConnectionId,
@@ -97,6 +109,125 @@ pub struct ConnectionEnd {
     delay_period: Duration,
 }
 
+mod sealed {
+    use super::*;
+
+    #[cfg_attr(
+        feature = "parity-scale-codec",
+        derive(
+            parity_scale_codec::Encode,
+            parity_scale_codec::Decode,
+            scale_info::TypeInfo
+        )
+    )]
+    #[cfg_attr(
+        feature = "borsh",
+        derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+    )]
+    struct InnerConnectionEnd {
+        pub state: State,
+        client_id: ClientId,
+        counterparty: Counterparty,
+        versions: Vec<Version>,
+        delay_period_secs: u64,
+        delay_period_nanos: u32,
+    }
+
+    impl From<InnerConnectionEnd> for ConnectionEnd {
+        fn from(value: InnerConnectionEnd) -> Self {
+            Self {
+                state: value.state,
+                client_id: value.client_id,
+                counterparty: value.counterparty,
+                versions: value.versions,
+                delay_period: Duration::new(value.delay_period_secs, value.delay_period_nanos),
+            }
+        }
+    }
+
+    impl From<ConnectionEnd> for InnerConnectionEnd {
+        fn from(value: ConnectionEnd) -> Self {
+            Self {
+                state: value.state,
+                client_id: value.client_id,
+                counterparty: value.counterparty,
+                versions: value.versions,
+                delay_period_secs: value.delay_period.as_secs(),
+                delay_period_nanos: value.delay_period.subsec_nanos(),
+            }
+        }
+    }
+
+    #[cfg(feature = "borsh")]
+    impl borsh::BorshSerialize for ConnectionEnd {
+        fn serialize<W: borsh::maybestd::io::Write>(
+            &self,
+            writer: &mut W,
+        ) -> borsh::maybestd::io::Result<()> {
+            let value = InnerConnectionEnd::from(self.clone());
+            borsh::BorshSerialize::serialize(&value, writer)
+        }
+    }
+
+    #[cfg(feature = "borsh")]
+    impl borsh::BorshDeserialize for ConnectionEnd {
+        fn deserialize(buf: &mut &[u8]) -> borsh::maybestd::io::Result<Self> {
+            let result = InnerConnectionEnd::deserialize(buf)?;
+            Ok(ConnectionEnd::from(result))
+        }
+    }
+
+    #[cfg(feature = "parity-scale-codec")]
+    impl parity_scale_codec::Encode for ConnectionEnd {
+        fn encode_to<T: parity_scale_codec::Output + ?Sized>(&self, writer: &mut T) {
+            let value = InnerConnectionEnd::from(self.clone());
+            value.encode_to(writer);
+        }
+    }
+
+    #[cfg(feature = "parity-scale-codec")]
+    impl parity_scale_codec::Decode for ConnectionEnd {
+        fn decode<I: parity_scale_codec::Input>(
+            input: &mut I,
+        ) -> Result<Self, parity_scale_codec::Error> {
+            let result = InnerConnectionEnd::decode(input)?;
+            Ok(ConnectionEnd::from(result))
+        }
+    }
+
+    #[cfg(feature = "parity-scale-codec")]
+    impl scale_info::TypeInfo for ConnectionEnd {
+        type Identity = Self;
+
+        fn type_info() -> scale_info::Type {
+            scale_info::Type::builder()
+                .path(scale_info::Path::new("ConnectionEnd", module_path!()))
+                .composite(
+                    scale_info::build::Fields::named()
+                        .field(|f| f.ty::<State>().name("state").type_name("State"))
+                        .field(|f| f.ty::<ClientId>().name("client_id").type_name("ClientId"))
+                        .field(|f| {
+                            f.ty::<Counterparty>()
+                                .name("counterparty")
+                                .type_name("Counterparty")
+                        })
+                        .field(|f| {
+                            f.ty::<Counterparty>()
+                                .name("counterparty")
+                                .type_name("Counterparty")
+                        })
+                        .field(|f| {
+                            f.ty::<Vec<Version>>()
+                                .name("versions")
+                                .type_name("Vec<Version>")
+                        })
+                        .field(|f| f.ty::<u64>().name("delay_period_secs").type_name("u64"))
+                        .field(|f| f.ty::<u32>().name("delay_period_nanos").type_name("u32")),
+                )
+        }
+    }
+}
+
 impl Default for ConnectionEnd {
     fn default() -> Self {
         Self {
@@ -247,6 +378,18 @@ impl ConnectionEnd {
     }
 }
 
+#[cfg_attr(
+    feature = "parity-scale-codec",
+    derive(
+        parity_scale_codec::Encode,
+        parity_scale_codec::Decode,
+        scale_info::TypeInfo
+    )
+)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 #[derive(Clone, Debug, Default, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct Counterparty {
     client_id: ClientId,
@@ -329,12 +472,24 @@ impl Counterparty {
     }
 }
 
+#[cfg_attr(
+    feature = "parity-scale-codec",
+    derive(
+        parity_scale_codec::Encode,
+        parity_scale_codec::Decode,
+        scale_info::TypeInfo
+    )
+)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub enum State {
-    Uninitialized = 0,
-    Init = 1,
-    TryOpen = 2,
-    Open = 3,
+    Uninitialized = 0isize,
+    Init = 1isize,
+    TryOpen = 2isize,
+    Open = 3isize,
 }
 
 impl State {

crates/ibc/src/core/ics03_connection/version.rs

@@ -11,6 +11,18 @@ use crate::core::ics03_connection::error::ConnectionError;
 use crate::core::ics04_channel::channel::Order;
 
 /// Stores the identifier and the features supported by a version
+#[cfg_attr(
+    feature = "parity-scale-codec",
+    derive(
+        parity_scale_codec::Encode,
+        parity_scale_codec::Decode,
+        scale_info::TypeInfo
+    )
+)]
+#[cfg_attr(
+    feature = "borsh",
+    derive(borsh::BorshSerialize, borsh::BorshDeserialize)
+)]
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct Version {
     /// unique version identifier