Add frame-metadata from substrate.

2026-04-22 08:57:58 +00:00 · 2020-12-10 13:02:22 +01:00
parent 81929036fd
commit 6826ca8a00
7 changed files with 713 additions and 8 deletions
@@ -0,0 +1,432 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2018-2020 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Decodable variant of the RuntimeMetadata.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(feature = "std")]
+use serde::Serialize;
+#[cfg(feature = "std")]
+use codec::{Decode, Input, Error};
+use codec::{Encode, Output};
+
+#[cfg(not(feature = "std"))]
+extern crate alloc;
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
+#[cfg(feature = "std")]
+type StringBuf = String;
+
+/// Current prefix of metadata
+pub const META_RESERVED: u32 = 0x6174656d; // 'meta' warn endianness
+
+/// On `no_std` we do not support `Decode` and thus `StringBuf` is just `&'static str`.
+/// So, if someone tries to decode this stuff on `no_std`, they will get a compilation error.
+#[cfg(not(feature = "std"))]
+type StringBuf = &'static str;
+
+/// A type that decodes to a different type than it encodes.
+/// The user needs to make sure that both types use the same encoding.
+///
+/// For example a `&'static [ &'static str ]` can be decoded to a `Vec<String>`.
+#[derive(Clone)]
+pub enum DecodeDifferent<B, O> where B: 'static, O: 'static {
+	Encode(B),
+	Decoded(O),
+}
+
+impl<B, O> Encode for DecodeDifferent<B, O> where B: Encode + 'static, O: Encode + 'static {
+	fn encode_to<W: Output>(&self, dest: &mut W) {
+		match self {
+			DecodeDifferent::Encode(b) => b.encode_to(dest),
+			DecodeDifferent::Decoded(o) => o.encode_to(dest),
+		}
+	}
+}
+
+impl<B, O> codec::EncodeLike for DecodeDifferent<B, O> where B: Encode + 'static, O: Encode + 'static {}
+
+#[cfg(feature = "std")]
+impl<B, O> Decode for DecodeDifferent<B, O> where B: 'static, O: Decode + 'static {
+	fn decode<I: Input>(input: &mut I) -> Result<Self, Error> {
+		<O>::decode(input).map(|val| {
+			DecodeDifferent::Decoded(val)
+		})
+	}
+}
+
+impl<B, O> PartialEq for DecodeDifferent<B, O>
+where
+	B: Encode + Eq + PartialEq + 'static,
+	O: Encode + Eq + PartialEq + 'static,
+{
+	fn eq(&self, other: &Self) -> bool {
+		self.encode() == other.encode()
+	}
+}
+
+impl<B, O> Eq for DecodeDifferent<B, O>
+	where B: Encode + Eq + PartialEq + 'static, O: Encode + Eq + PartialEq + 'static
+{}
+
+impl<B, O> core::fmt::Debug for DecodeDifferent<B, O>
+	where
+		B: core::fmt::Debug + Eq + 'static,
+		O: core::fmt::Debug + Eq + 'static,
+{
+	fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+		match self {
+			DecodeDifferent::Encode(b) => b.fmt(f),
+			DecodeDifferent::Decoded(o) => o.fmt(f),
+		}
+	}
+}
+
+#[cfg(feature = "std")]
+impl<B, O> serde::Serialize for DecodeDifferent<B, O>
+	where
+		B: serde::Serialize + 'static,
+		O: serde::Serialize + 'static,
+{
+	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
+		match self {
+			DecodeDifferent::Encode(b) => b.serialize(serializer),
+			DecodeDifferent::Decoded(o) => o.serialize(serializer),
+		}
+	}
+}
+
+pub type DecodeDifferentArray<B, O=B> = DecodeDifferent<&'static [B], Vec<O>>;
+
+type DecodeDifferentStr = DecodeDifferent<&'static str, StringBuf>;
+
+/// All the metadata about a function.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct FunctionMetadata {
+	pub name: DecodeDifferentStr,
+	pub arguments: DecodeDifferentArray<FunctionArgumentMetadata>,
+	pub documentation: DecodeDifferentArray<&'static str, StringBuf>,
+}
+
+/// All the metadata about a function argument.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct FunctionArgumentMetadata {
+	pub name: DecodeDifferentStr,
+	pub ty: DecodeDifferentStr,
+}
+
+/// Newtype wrapper for support encoding functions (actual the result of the function).
+#[derive(Clone, Eq)]
+pub struct FnEncode<E>(pub fn() -> E) where E: Encode + 'static;
+
+impl<E: Encode> Encode for FnEncode<E> {
+	fn encode_to<W: Output>(&self, dest: &mut W) {
+		self.0().encode_to(dest);
+	}
+}
+
+impl<E: Encode> codec::EncodeLike for FnEncode<E> {}
+
+impl<E: Encode + PartialEq> PartialEq for FnEncode<E> {
+	fn eq(&self, other: &Self) -> bool {
+		self.0().eq(&other.0())
+	}
+}
+
+impl<E: Encode + core::fmt::Debug> core::fmt::Debug for FnEncode<E> {
+	fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+		self.0().fmt(f)
+	}
+}
+
+#[cfg(feature = "std")]
+impl<E: Encode + serde::Serialize> serde::Serialize for FnEncode<E> {
+	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
+		self.0().serialize(serializer)
+	}
+}
+
+/// All the metadata about an outer event.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct OuterEventMetadata {
+	pub name: DecodeDifferentStr,
+	pub events: DecodeDifferentArray<
+		(&'static str, FnEncode<&'static [EventMetadata]>),
+		(StringBuf, Vec<EventMetadata>)
+	>,
+}
+
+/// All the metadata about an event.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct EventMetadata {
+	pub name: DecodeDifferentStr,
+	pub arguments: DecodeDifferentArray<&'static str, StringBuf>,
+	pub documentation: DecodeDifferentArray<&'static str, StringBuf>,
+}
+
+/// All the metadata about one storage entry.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct StorageEntryMetadata {
+	pub name: DecodeDifferentStr,
+	pub modifier: StorageEntryModifier,
+	pub ty: StorageEntryType,
+	pub default: ByteGetter,
+	pub documentation: DecodeDifferentArray<&'static str, StringBuf>,
+}
+
+/// All the metadata about one module constant.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct ModuleConstantMetadata {
+	pub name: DecodeDifferentStr,
+	pub ty: DecodeDifferentStr,
+	pub value: ByteGetter,
+	pub documentation: DecodeDifferentArray<&'static str, StringBuf>,
+}
+
+/// All the metadata about a module error.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct ErrorMetadata {
+	pub name: DecodeDifferentStr,
+	pub documentation: DecodeDifferentArray<&'static str, StringBuf>,
+}
+
+/// All the metadata about errors in a module.
+pub trait ModuleErrorMetadata {
+	fn metadata() -> &'static [ErrorMetadata];
+}
+
+impl ModuleErrorMetadata for &'static str {
+	fn metadata() -> &'static [ErrorMetadata] {
+		&[]
+	}
+}
+
+/// A technical trait to store lazy initiated vec value as static dyn pointer.
+pub trait DefaultByte: Send + Sync {
+	fn default_byte(&self) -> Vec<u8>;
+}
+
+/// Wrapper over dyn pointer for accessing a cached once byte value.
+#[derive(Clone)]
+pub struct DefaultByteGetter(pub &'static dyn DefaultByte);
+
+/// Decode different for static lazy initiated byte value.
+pub type ByteGetter = DecodeDifferent<DefaultByteGetter, Vec<u8>>;
+
+impl Encode for DefaultByteGetter {
+	fn encode_to<W: Output>(&self, dest: &mut W) {
+		self.0.default_byte().encode_to(dest)
+	}
+}
+
+impl codec::EncodeLike for DefaultByteGetter {}
+
+impl PartialEq<DefaultByteGetter> for DefaultByteGetter {
+	fn eq(&self, other: &DefaultByteGetter) -> bool {
+		let left = self.0.default_byte();
+		let right = other.0.default_byte();
+		left.eq(&right)
+	}
+}
+
+impl Eq for DefaultByteGetter { }
+
+#[cfg(feature = "std")]
+impl serde::Serialize for DefaultByteGetter {
+	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
+		self.0.default_byte().serialize(serializer)
+	}
+}
+
+impl core::fmt::Debug for DefaultByteGetter {
+	fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+		self.0.default_byte().fmt(f)
+	}
+}
+
+/// Hasher used by storage maps
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub enum StorageHasher {
+	Blake2_128,
+	Blake2_256,
+	Blake2_128Concat,
+	Twox128,
+	Twox256,
+	Twox64Concat,
+	Identity,
+}
+
+/// A storage entry type.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub enum StorageEntryType {
+	Plain(DecodeDifferentStr),
+	Map {
+		hasher: StorageHasher,
+		key: DecodeDifferentStr,
+		value: DecodeDifferentStr,
+		// is_linked flag previously, unused now to keep backwards compat
+		unused: bool,
+	},
+	DoubleMap {
+		hasher: StorageHasher,
+		key1: DecodeDifferentStr,
+		key2: DecodeDifferentStr,
+		value: DecodeDifferentStr,
+		key2_hasher: StorageHasher,
+	},
+}
+
+/// A storage entry modifier.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub enum StorageEntryModifier {
+	Optional,
+	Default,
+}
+
+/// All metadata of the storage.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct StorageMetadata {
+	/// The common prefix used by all storage entries.
+	pub prefix: DecodeDifferent<&'static str, StringBuf>,
+	pub entries: DecodeDifferent<&'static [StorageEntryMetadata], Vec<StorageEntryMetadata>>,
+}
+
+/// Metadata prefixed by a u32 for reserved usage
+#[derive(Eq, Encode, PartialEq)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct RuntimeMetadataPrefixed(pub u32, pub RuntimeMetadata);
+
+/// Metadata of the extrinsic used by the runtime.
+#[derive(Eq, Encode, PartialEq)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct ExtrinsicMetadata {
+	/// Extrinsic version.
+	pub version: u8,
+	/// The signed extensions in the order they appear in the extrinsic.
+	pub signed_extensions: Vec<DecodeDifferentStr>,
+}
+
+/// The metadata of a runtime.
+/// The version ID encoded/decoded through
+/// the enum nature of `RuntimeMetadata`.
+#[derive(Eq, Encode, PartialEq)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub enum RuntimeMetadata {
+	/// Unused; enum filler.
+	V0(RuntimeMetadataDeprecated),
+	/// Version 1 for runtime metadata. No longer used.
+	V1(RuntimeMetadataDeprecated),
+	/// Version 2 for runtime metadata. No longer used.
+	V2(RuntimeMetadataDeprecated),
+	/// Version 3 for runtime metadata. No longer used.
+	V3(RuntimeMetadataDeprecated),
+	/// Version 4 for runtime metadata. No longer used.
+	V4(RuntimeMetadataDeprecated),
+	/// Version 5 for runtime metadata. No longer used.
+	V5(RuntimeMetadataDeprecated),
+	/// Version 6 for runtime metadata. No longer used.
+	V6(RuntimeMetadataDeprecated),
+	/// Version 7 for runtime metadata. No longer used.
+	V7(RuntimeMetadataDeprecated),
+	/// Version 8 for runtime metadata. No longer used.
+	V8(RuntimeMetadataDeprecated),
+	/// Version 9 for runtime metadata. No longer used.
+	V9(RuntimeMetadataDeprecated),
+	/// Version 10 for runtime metadata. No longer used.
+	V10(RuntimeMetadataDeprecated),
+	/// Version 11 for runtime metadata. No longer used.
+	V11(RuntimeMetadataDeprecated),
+	/// Version 12 for runtime metadata.
+    #[cfg(feature = "v12")]
+	V12(RuntimeMetadataV12),
+    #[cfg(not(feature = "v12"))]
+	V12(RuntimeMetadataDeprecated),
+}
+
+/// Enum that should fail.
+#[derive(Eq, PartialEq)]
+#[cfg_attr(feature = "std", derive(Serialize, Debug))]
+pub enum RuntimeMetadataDeprecated { }
+
+impl Encode for RuntimeMetadataDeprecated {
+	fn encode_to<W: Output>(&self, _dest: &mut W) {}
+}
+
+impl codec::EncodeLike for RuntimeMetadataDeprecated {}
+
+#[cfg(feature = "std")]
+impl Decode for RuntimeMetadataDeprecated {
+	fn decode<I: Input>(_input: &mut I) -> Result<Self, Error> {
+		Err("Decoding is not supported".into())
+	}
+}
+
+/// The metadata of a runtime.
+#[derive(Eq, Encode, PartialEq)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct RuntimeMetadataV12 {
+	/// Metadata of all the modules.
+	pub modules: DecodeDifferentArray<ModuleMetadata>,
+	/// Metadata of the extrinsic.
+	pub extrinsic: ExtrinsicMetadata,
+}
+
+/// The latest version of the metadata.
+pub type RuntimeMetadataLastVersion = RuntimeMetadataV12;
+
+/// All metadata about an runtime module.
+#[derive(Clone, PartialEq, Eq, Encode)]
+#[cfg_attr(feature = "std", derive(Decode, Serialize, Debug))]
+pub struct ModuleMetadata {
+	pub name: DecodeDifferentStr,
+	pub storage: Option<DecodeDifferent<FnEncode<StorageMetadata>, StorageMetadata>>,
+	pub calls: ODFnA<FunctionMetadata>,
+	pub event: ODFnA<EventMetadata>,
+	pub constants: DFnA<ModuleConstantMetadata>,
+	pub errors: DFnA<ErrorMetadata>,
+	/// Define the index of the module, this index will be used for the encoding of module event,
+	/// call and origin variants.
+	pub index: u8,
+}
+
+type ODFnA<T> = Option<DFnA<T>>;
+type DFnA<T> = DecodeDifferent<FnEncode<&'static [T]>, Vec<T>>;
+
+impl Into<Vec<u8>> for RuntimeMetadataPrefixed {
+	fn into(self) -> Vec<u8> {
+		self.encode()
+	}
+}
+
+impl Into<RuntimeMetadataPrefixed> for RuntimeMetadataLastVersion {
+	fn into(self) -> RuntimeMetadataPrefixed {
+		RuntimeMetadataPrefixed(META_RESERVED, RuntimeMetadata::V12(self))
+	}
+}