Add serde feature flag to primitives

primitives/application-crypto/Cargo.toml

@@ -18,7 +18,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 sp-core = { version = "7.0.0", default-features = false, path = "../core" }
 codec = { package = "parity-scale-codec", version = "3.2.2", default-features = false, features = ["derive"] }
 scale-info = { version = "2.5.0", default-features = false, features = ["derive"] }
-serde = { version = "1.0.136", optional = true, features = ["derive"] }
+serde = { version = "1.0.136", default-features = false, optional = true, features = ["derive", "alloc"]  }
 sp-std = { version = "5.0.0", default-features = false, path = "../std" }
 sp-io = { version = "7.0.0", default-features = false, path = "../io" }
 
@@ -29,11 +29,18 @@ std = [
 	"sp-core/std",
 	"codec/std",
 	"scale-info/std",
-	"serde",
+	"serde/std",
 	"sp-std/std",
 	"sp-io/std",
 ]
 
+# Serde support without relying on std features.
+serde = [
+	"dep:serde",
+	"sp-core/serde",
+	"scale-info/serde",
+]
+
 # This feature enables all crypto primitives for `no_std` builds like microcontrollers
 # or Intel SGX.
 # For the regular wasm runtime builds this should not be used.

primitives/application-crypto/src/lib.rs

@@ -23,7 +23,9 @@
 pub use sp_core::crypto::{key_types, CryptoTypeId, KeyTypeId};
 #[doc(hidden)]
 #[cfg(feature = "full_crypto")]
-pub use sp_core::crypto::{DeriveError, DeriveJunction, Pair, SecretStringError, Ss58Codec};
+pub use sp_core::crypto::{DeriveError, Pair, SecretStringError};
+#[cfg(any(feature = "full_crypto", feature = "serde"))]
+pub use sp_core::crypto::{DeriveJunction, Ss58Codec};
 #[doc(hidden)]
 pub use sp_core::{
 	self,
@@ -36,7 +38,7 @@ pub use codec;
 #[doc(hidden)]
 pub use scale_info;
 #[doc(hidden)]
-#[cfg(feature = "std")]
+#[cfg(feature = "serde")]
 pub use serde;
 #[doc(hidden)]
 pub use sp_std::{ops::Deref, vec::Vec};
@@ -282,7 +284,7 @@ macro_rules! app_crypto_public_not_full_crypto {
 #[macro_export]
 macro_rules! app_crypto_public_common {
 	($public:ty, $sig:ty, $key_type:expr, $crypto_type:expr) => {
-		$crate::app_crypto_public_common_if_std!();
+		$crate::app_crypto_public_common_if_serde!();
 
 		impl AsRef<[u8]> for Public {
 			fn as_ref(&self) -> &[u8] {
@@ -323,11 +325,11 @@ macro_rules! app_crypto_public_common {
 	};
 }
 
-/// Implements traits for the public key type if `feature = "std"` is enabled.
-#[cfg(feature = "std")]
+/// Implements traits for the public key type if `feature = "serde"` is enabled.
+#[cfg(feature = "serde")]
 #[doc(hidden)]
 #[macro_export]
-macro_rules! app_crypto_public_common_if_std {
+macro_rules! app_crypto_public_common_if_serde {
 	() => {
 		impl $crate::Derive for Public {
 			fn derive<Iter: Iterator<Item = $crate::DeriveJunction>>(
@@ -338,15 +340,15 @@ macro_rules! app_crypto_public_common_if_std {
 			}
 		}
 
-		impl std::fmt::Display for Public {
-			fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+		impl core::fmt::Display for Public {
+			fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
 				use $crate::Ss58Codec;
 				write!(f, "{}", self.0.to_ss58check())
 			}
 		}
 
 		impl $crate::serde::Serialize for Public {
-			fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+			fn serialize<S>(&self, serializer: S) -> core::result::Result<S::Ok, S::Error>
 			where
 				S: $crate::serde::Serializer,
 			{
@@ -356,22 +358,25 @@ macro_rules! app_crypto_public_common_if_std {
 		}
 
 		impl<'de> $crate::serde::Deserialize<'de> for Public {
-			fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
+			fn deserialize<D>(deserializer: D) -> core::result::Result<Self, D::Error>
 			where
 				D: $crate::serde::Deserializer<'de>,
 			{
+				#[cfg(not(feature = "std"))]
+				use sp_std::alloc::{format, string::String};
 				use $crate::Ss58Codec;
+
 				Public::from_ss58check(&String::deserialize(deserializer)?)
 					.map_err(|e| $crate::serde::de::Error::custom(format!("{:?}", e)))
 			}
 		}
 	};
 }
 
-#[cfg(not(feature = "std"))]
+#[cfg(not(feature = "serde"))]
 #[doc(hidden)]
 #[macro_export]
-macro_rules! app_crypto_public_common_if_std {
+macro_rules! app_crypto_public_common_if_serde {
 	() => {
 		impl $crate::Derive for Public {}
 	};

primitives/arithmetic/Cargo.toml

@@ -21,7 +21,7 @@ codec = { package = "parity-scale-codec", version = "3.2.2", default-features =
 integer-sqrt = "0.1.2"
 num-traits = { version = "0.2.8", default-features = false }
 scale-info = { version = "2.5.0", default-features = false, features = ["derive"] }
-serde = { version = "1.0.136", features = ["derive"], optional = true }
+serde = { version = "1.0.136", default-features = false, features = ["derive", "alloc"], optional = true }
 static_assertions = "1.1.0"
 sp-std = { version = "5.0.0", default-features = false, path = "../std" }
 
@@ -37,9 +37,14 @@ std = [
 	"codec/std",
 	"num-traits/std",
 	"scale-info/std",
-	"serde",
+	"serde/std",
 	"sp-std/std",
 ]
+# Serde support without relying on std features.
+serde = [
+	"dep:serde",
+	"scale-info/serde",
+]
 
 [[bench]]
 name = "bench"

primitives/arithmetic/src/fixed_point.rs

@@ -32,9 +32,12 @@ use sp_std::{
 	prelude::*,
 };
 
-#[cfg(feature = "std")]
+#[cfg(feature = "serde")]
 use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 
+#[cfg(all(not(feature = "std"), feature = "serde"))]
+use sp_std::alloc::string::{String, ToString};
+
 /// Integer types that can be used to interact with `FixedPointNumber` implementations.
 pub trait FixedPointOperand:
 	Copy
@@ -928,14 +931,12 @@ macro_rules! implement_fixed {
 			}
 		}
 
-		#[cfg(feature = "std")]
 		impl sp_std::fmt::Display for $name {
 			fn fmt(&self, f: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {
 				write!(f, "{}", self.0)
 			}
 		}
 
-		#[cfg(feature = "std")]
 		impl sp_std::str::FromStr for $name {
 			type Err = &'static str;
 
@@ -948,7 +949,7 @@ macro_rules! implement_fixed {
 
 		// Manual impl `Serialize` as serde_json does not support i128.
 		// TODO: remove impl if issue https://github.com/serde-rs/json/issues/548 fixed.
-		#[cfg(feature = "std")]
+		#[cfg(feature = "serde")]
 		impl Serialize for $name {
 			fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
 			where
@@ -960,7 +961,7 @@ macro_rules! implement_fixed {
 
 		// Manual impl `Deserialize` as serde_json does not support i128.
 		// TODO: remove impl if issue https://github.com/serde-rs/json/issues/548 fixed.
-		#[cfg(feature = "std")]
+		#[cfg(feature = "serde")]
 		impl<'de> Deserialize<'de> for $name {
 			fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
 			where

primitives/arithmetic/src/lib.rs

@@ -53,12 +53,12 @@ use traits::{BaseArithmetic, One, SaturatedConversion, Unsigned, Zero};
 use codec::{Decode, Encode, MaxEncodedLen};
 use scale_info::TypeInfo;
 
-#[cfg(feature = "std")]
+#[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
 /// Arithmetic errors.
 #[derive(Eq, PartialEq, Clone, Copy, Encode, Decode, Debug, TypeInfo, MaxEncodedLen)]
-#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum ArithmeticError {
 	/// Underflow.
 	Underflow,

primitives/arithmetic/src/per_things.rs

@@ -15,7 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(feature = "std")]
+#[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
 use crate::traits::{
@@ -556,7 +556,7 @@ macro_rules! implement_per_thing {
 		/// A fixed point representation of a number in the range [0, 1].
 		///
 		#[doc = $title]
-		#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+		#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 		#[derive(Encode, Copy, Clone, PartialEq, Eq, codec::MaxEncodedLen, PartialOrd, Ord, scale_info::TypeInfo)]
 		pub struct $name($type);
 

primitives/consensus/babe/Cargo.toml

@@ -16,7 +16,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 async-trait = { version = "0.1.57", optional = true }
 codec = { package = "parity-scale-codec", version = "3.2.2", default-features = false }
 scale-info = { version = "2.5.0", default-features = false, features = ["derive"] }
-serde = { version = "1.0.136", features = ["derive"], optional = true }
+serde = { version = "1.0.136", default-features = false, features = ["derive", "alloc"], optional = true }
 sp-api = { version = "4.0.0-dev", default-features = false, path = "../../api" }
 sp-application-crypto = { version = "7.0.0", default-features = false, path = "../../application-crypto" }
 sp-consensus = { version = "0.10.0-dev", optional = true, path = "../common" }
@@ -34,7 +34,7 @@ std = [
 	"async-trait",
 	"codec/std",
 	"scale-info/std",
-	"serde",
+	"serde/std",
 	"sp-api/std",
 	"sp-application-crypto/std",
 	"sp-consensus",
@@ -46,3 +46,13 @@ std = [
 	"sp-std/std",
 	"sp-timestamp",
 ]
+
+# Serde support without relying on std features.
+serde = [
+	"dep:serde",
+	"scale-info/serde",
+	"sp-application-crypto/serde",
+	"sp-consensus-slots/serde",
+	"sp-core/serde",
+	"sp-runtime/serde",
+]

primitives/consensus/babe/src/lib.rs

@@ -25,7 +25,7 @@ pub mod inherents;
 
 use codec::{Decode, Encode, MaxEncodedLen};
 use scale_info::TypeInfo;
-#[cfg(feature = "std")]
+#[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 use sp_runtime::{traits::Header, ConsensusEngineId, RuntimeDebug};
 use sp_std::vec::Vec;
@@ -217,7 +217,7 @@ impl BabeConfiguration {
 
 /// Types of allowed slots.
 #[derive(Clone, Copy, PartialEq, Eq, Encode, Decode, RuntimeDebug, MaxEncodedLen, TypeInfo)]
-#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum AllowedSlots {
 	/// Only allow primary slots.
 	PrimarySlots,
@@ -241,7 +241,7 @@ impl AllowedSlots {
 
 /// Configuration data used by the BABE consensus engine that may change with epochs.
 #[derive(Clone, PartialEq, Eq, Encode, Decode, RuntimeDebug, MaxEncodedLen, TypeInfo)]
-#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct BabeEpochConfiguration {
 	/// A constant value that is used in the threshold calculation formula.
 	/// Expressed as a rational where the first member of the tuple is the

primitives/consensus/beefy/Cargo.toml

@@ -13,8 +13,8 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
 codec = { package = "parity-scale-codec", version = "3.2.2", default-features = false, features = ["derive"] }
-serde = { version = "1.0.136", optional = true, features = ["derive"] }
 scale-info = { version = "2.5.0", default-features = false, features = ["derive"] }
+serde = { version = "1.0.136", default-features = false,  optional = true, features =  ["derive", "alloc"] }
 sp-api = { version = "4.0.0-dev", default-features = false, path = "../../api" }
 sp-application-crypto = { version = "7.0.0", default-features = false, path = "../../application-crypto" }
 sp-core = { version = "7.0.0", default-features = false, path = "../../core" }
@@ -34,7 +34,7 @@ default = ["std"]
 std = [
 	"codec/std",
 	"scale-info/std",
-	"serde",
+	"serde/std",
 	"sp-api/std",
 	"sp-application-crypto/std",
 	"sp-core/std",
@@ -43,3 +43,12 @@ std = [
 	"sp-runtime/std",
 	"sp-std/std",
 ]
+
+# Serde support without relying on std features.
+serde = [
+	"dep:serde",
+	"scale-info/serde",
+	"sp-application-crypto/serde",
+	"sp-core/serde",
+	"sp-runtime/serde",
+]

primitives/consensus/beefy/src/mmr.rs

@@ -101,7 +101,7 @@ impl MmrLeafVersion {
 
 /// Details of a BEEFY authority set.
 #[derive(Debug, Default, PartialEq, Eq, Clone, Encode, Decode, TypeInfo, MaxEncodedLen)]
-#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct BeefyAuthoritySet<MerkleRoot> {
 	/// Id of the set.
 	///

primitives/consensus/grandpa/Cargo.toml

@@ -18,7 +18,7 @@ codec = { package = "parity-scale-codec", version = "3.2.2", default-features =
 grandpa = { package = "finality-grandpa", version = "0.16.2", default-features = false, features = ["derive-codec"] }
 log = { version = "0.4.17", default-features = false }
 scale-info = { version = "2.5.0", default-features = false, features = ["derive"] }
-serde = { version = "1.0.136", features = ["derive"], optional = true }
+serde = { version = "1.0.136", features = ["derive", "alloc"], default-features = false, optional = true }
 sp-api = { version = "4.0.0-dev", default-features = false, path = "../../api" }
 sp-application-crypto = { version = "7.0.0", default-features = false, path = "../../application-crypto" }
 sp-core = { version = "7.0.0", default-features = false, path = "../../core" }
@@ -33,11 +33,20 @@ std = [
 	"grandpa/std",
 	"log/std",
 	"scale-info/std",
-	"serde",
+	"serde/std",
 	"sp-api/std",
 	"sp-application-crypto/std",
 	"sp-core/std",
 	"sp-keystore",
 	"sp-runtime/std",
 	"sp-std/std",
 ]
+
+# Serde support without relying on std features.
+serde = [
+	"dep:serde",
+	"scale-info/serde",
+	"sp-application-crypto/serde",
+	"sp-core/serde",
+	"sp-runtime/serde",
+]