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XCM Revamp Continued (#2865)

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* Introduce plurality XCM locations

* Add RelayedFrom

* DMP dispatch weight handling.

* Add pallet for XCM sending, add routing logic.

* Update error types & doc

* Fix warnings.

* Fixes

* Fixes

* Fixes

* Bump Substrate

* Fixes

* Docs

* Docs

* Docs

* Fixes

* Fixes

* Fixes

* Update xcm/pallet-xcm/src/lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Docs

* Fixes

* Update lib.rs

* Fixes

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Gavin Wood
2021-04-09 20:34:28 +02:00
committed by GitHub
parent 8961628e7c
commit c9102c11a4
18 changed files with 632 additions and 227 deletions
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polkadot/xcm/src/v0/traits.rs
+28 -10
View File
@@ -21,7 +21,7 @@ use parity_scale_codec::{Encode, Decode};
use super::{MultiLocation, Xcm};
#[derive(Copy, Clone, Encode, Decode, Eq, PartialEq, Ord, PartialOrd, Debug)]
#[derive(Clone, Encode, Decode, Eq, PartialEq, Debug)]
pub enum Error {
Undefined,
Overflow,
@@ -33,7 +33,11 @@ pub enum Error {
UntrustedReserveLocation,
UntrustedTeleportLocation,
DestinationBufferOverflow,
CannotReachDestination(#[codec(skip)] &'static str),
/// The message and destination was recognised as being reachable but the operation could not be completed.
/// A human-readable explanation of the specific issue is provided.
SendFailed(#[codec(skip)] &'static str),
/// The message and destination combination was not recognised as being reachable.
CannotReachDestination(MultiLocation, Xcm<()>),
MultiLocationFull,
FailedToDecode,
BadOrigin,
@@ -68,9 +72,6 @@ pub enum Error {
NotWithdrawable,
/// Indicates that the consensus system cannot deposit an asset under the ownership of a particular location.
LocationCannotHold,
/// We attempted to send an XCM to the local consensus system. Execution was not possible probably due to
/// no execution weight being assigned.
DestinationIsLocal,
}
impl From<()> for Error {
@@ -85,7 +86,7 @@ pub type Result = result::Result<(), Error>;
pub type Weight = u64;
/// Outcome of an XCM excution.
#[derive(Copy, Clone, Encode, Decode, Eq, PartialEq, Debug)]
#[derive(Clone, Encode, Decode, Eq, PartialEq, Debug)]
pub enum Outcome {
/// Execution completed successfully; given weight was used.
Complete(Weight),
@@ -121,21 +122,38 @@ impl Outcome {
}
pub trait ExecuteXcm<Call> {
type Call;
fn execute_xcm(origin: MultiLocation, message: Xcm<Call>, weight_limit: Weight) -> Outcome;
}
impl<C> ExecuteXcm<C> for () {
type Call = C;
fn execute_xcm(_origin: MultiLocation, _message: Xcm<C>, _weight_limit: Weight) -> Outcome {
Outcome::Error(Error::Unimplemented)
}
}
/// Utility for sending an XCM message.
///
/// These can be amalgamted in tuples to form sophisticated routing systems.
pub trait SendXcm {
fn send_xcm(dest: MultiLocation, msg: Xcm<()>) -> Result;
/// Send an XCM `message` to a given `destination`.
///
/// If it is not a destination which can be reached with this type but possibly could by others,
/// then it *MUST* return `CannotReachDestination`. Any other error will cause the tuple implementation to
/// exit early without trying other type fields.
fn send_xcm(destination: MultiLocation, message: Xcm<()>) -> Result;
}
impl SendXcm for () {
fn send_xcm(_dest: MultiLocation, _msg: Xcm<()>) -> Result {
Err(Error::Unimplemented)
#[impl_trait_for_tuples::impl_for_tuples(30)]
impl SendXcm for Tuple {
fn send_xcm(destination: MultiLocation, message: Xcm<()>) -> Result {
for_tuples!( #(
let (destination, message) = match Tuple::send_xcm(destination, message) {
Err(Error::CannotReachDestination(d, m)) => (d, m),
o @ _ => return o,
};
)* );
Err(Error::CannotReachDestination(destination, message))
}
}