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Check out/in assets when teleporting to maintain total issuance (#3007)

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* Check out/in assets when teleporting to maintain total issuance

* Fixes

* Fixes

* Fixes

* Fixes

* Update xcm/xcm-executor/src/traits/transact_asset.rs

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

* Docs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Gavin Wood
2021-05-12 08:39:16 +02:00
committed by GitHub
parent c68903f3bb
commit 41a93127a9
9 changed files with 179 additions and 15 deletions
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polkadot/xcm/xcm-executor/src/lib.rs
+10
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@@ -154,6 +154,13 @@ impl<Config: config::Config> XcmExecutor<Config> {
// We only trust the origin to send us assets that they identify as their
// sovereign assets.
ensure!(Config::IsTeleporter::filter_asset_location(asset, &origin), XcmError::UntrustedTeleportLocation);
// We should check that the asset can actually be teleported in (for this to be in error, there
// would need to be an accounting violation by one of the trusted chains, so it's unlikely, but we
// don't want to punish a possibly innocent chain/user).
Config::AssetTransactor::can_check_in(&origin, asset)?;
}
for asset in assets.iter() {
Config::AssetTransactor::check_in(&origin, asset);
}
Some((Assets::from(assets), effects))
}
@@ -238,6 +245,9 @@ impl<Config: config::Config> XcmExecutor<Config> {
Config::XcmSender::send_xcm(reserve, Xcm::WithdrawAsset { assets, effects })?;
}
Order::InitiateTeleport { assets, dest, effects} => {
for asset in assets.iter() {
Config::AssetTransactor::check_out(&origin, asset);
}
let assets = Self::reanchored(holding.saturating_take(assets), &dest);
Config::XcmSender::send_xcm(dest, Xcm::TeleportAsset { assets, effects })?;
}