Pass transaction source to validate_transaction (#5366)

* WiP

* Support source in the runtime API.

* Finish implementation in txpool.

* Fix warning.

* Fix tests.

* Apply suggestions from code review

Co-Authored-By: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-Authored-By: Nikolay Volf <nikvolf@gmail.com>

* Extra changes.

* Fix test and benches.

* fix test

* Fix test & benches again.

* Fix tests.

* Update bumpalo

* Fix doc test.

* Fix doctest.

* Fix doctest.

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Nikolay Volf <nikvolf@gmail.com>

substrate/primitives/runtime/src/traits.rs

@@ -28,7 +28,8 @@ use serde::{Serialize, Deserialize, de::DeserializeOwned};
 use sp_core::{self, Hasher, TypeId, RuntimeDebug};
 use crate::codec::{Codec, Encode, Decode};
 use crate::transaction_validity::{
-	ValidTransaction, TransactionValidity, TransactionValidityError, UnknownTransaction,
+	ValidTransaction, TransactionSource, TransactionValidity, TransactionValidityError,
+	UnknownTransaction,
 };
 use crate::generic::{Digest, DigestItem};
 pub use sp_arithmetic::traits::{
@@ -851,6 +852,7 @@ pub trait Applyable: Sized + Send + Sync {
 	/// Checks to see if this is a valid *transaction*. It returns information on it if so.
 	fn validate<V: ValidateUnsigned<Call=Self::Call>>(
 		&self,
+		source: TransactionSource,
 		info: Self::DispatchInfo,
 		len: usize,
 	) -> TransactionValidity;
@@ -897,7 +899,7 @@ pub trait ValidateUnsigned {
 	///
 	/// Changes made to storage WILL be persisted if the call returns `Ok`.
 	fn pre_dispatch(call: &Self::Call) -> Result<(), TransactionValidityError> {
-		Self::validate_unsigned(call)
+		Self::validate_unsigned(TransactionSource::InBlock, call)
 			.map(|_| ())
 			.map_err(Into::into)
 	}
@@ -908,7 +910,7 @@ pub trait ValidateUnsigned {
 	/// whether the transaction would panic if it were included or not.
 	///
 	/// Changes made to storage should be discarded by caller.
-	fn validate_unsigned(call: &Self::Call) -> TransactionValidity;
+	fn validate_unsigned(source: TransactionSource, call: &Self::Call) -> TransactionValidity;
 }
 
 /// Opaque data type that may be destructured into a series of raw byte slices (which represent