Metadata V15: Enrich extrinsic type info for decoding (#14123)

* metadata-ir: Add extrinsic type info to decode address, call, sig

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* frame-metadata: Point to unreleased branch

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata-ir: Include addrees, call, signature in V15 conversion

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata-ir: Include extra ty

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* construct_runtime: Extract address,call,sig,extra ty from tx type

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* frame/tests: Check metadata populates xt types correctly

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata-ir/tests: Add extra fields on ExtrinsicMetadataIR

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* primitives/traits: Expand the `Extrinsic::SignaturePayload`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* primitives: Adjust to new `Extrinsic` associated types

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* frame/metadata: Simplify metadata generation

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* frame/example: Adjust to new interface

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* frame/tests: Adjust `extrinsic_metadata_ir_types`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Revert the additional Extrinsic' associated types

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* primitives: Add `SignaturePayload` marker trait

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* primitives: Implement SignaturePayload for empty tuple

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Adjust to new SignaturePayload trait

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* tests: Adjust `extrinsic_metadata_ir_types` to new interface

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* frame/support: Adjust pallet test

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* frame: Add Extrinsic length prefix to the metadata

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* primitives: Populate `ExtrinsicMetadataIR` with `len_ty`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Update primitives/runtime/src/traits.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* Apply cargo fmt

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* v15: Remove len type of the extrinsic

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cargo: Update frame-metadata

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: parity-processbot <>

substrate/primitives/runtime/src/traits.rs

@@ -1242,14 +1242,14 @@ pub trait Block: Clone + Send + Sync + Codec + Eq + MaybeSerialize + Debug + 'st
 /// Something that acts like an `Extrinsic`.
 pub trait Extrinsic: Sized {
 	/// The function call.
-	type Call;
+	type Call: TypeInfo;
 
 	/// The payload we carry for signed extrinsics.
 	///
 	/// Usually it will contain a `Signature` and
 	/// may include some additional data that are specific to signed
 	/// extrinsics.
-	type SignaturePayload;
+	type SignaturePayload: SignaturePayload;
 
 	/// Is this `Extrinsic` signed?
 	/// If no information are available about signed/unsigned, `None` should be returned.
@@ -1268,6 +1268,31 @@ pub trait Extrinsic: Sized {
 	}
 }
 
+/// Something that acts like a [`SignaturePayload`](Extrinsic::SignaturePayload) of an
+/// [`Extrinsic`].
+pub trait SignaturePayload {
+	/// The type of the address that signed the extrinsic.
+	///
+	/// Particular to a signed extrinsic.
+	type SignatureAddress: TypeInfo;
+
+	/// The signature type of the extrinsic.
+	///
+	/// Particular to a signed extrinsic.
+	type Signature: TypeInfo;
+
+	/// The additional data that is specific to the signed extrinsic.
+	///
+	/// Particular to a signed extrinsic.
+	type SignatureExtra: TypeInfo;
+}
+
+impl SignaturePayload for () {
+	type SignatureAddress = ();
+	type Signature = ();
+	type SignatureExtra = ();
+}
+
 /// Implementor is an [`Extrinsic`] and provides metadata about this extrinsic.
 pub trait ExtrinsicMetadata {
 	/// The format version of the `Extrinsic`.