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7 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
 georgepisaltu
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bbd51ce867 |
Revert "FRAME: Create TransactionExtension as a replacement for SignedExtension (#2280)" (#3665)
This PR reverts #2280 which introduced `TransactionExtension` to replace `SignedExtension`. As a result of the discussion [here](https://github.com/paritytech/polkadot-sdk/pull/3623#issuecomment-1986789700), the changes will be reverted for now with plans to reintroduce the concept in the future. --------- Signed-off-by: georgepisaltu <george.pisaltu@parity.io> |
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|
Gavin Wood
|
fd5f9292f5 |
FRAME: Create TransactionExtension as a replacement for SignedExtension (#2280)
Closes #2160 First part of [Extrinsic Horizon](https://github.com/paritytech/polkadot-sdk/issues/2415) Introduces a new trait `TransactionExtension` to replace `SignedExtension`. Introduce the idea of transactions which obey the runtime's extensions and have according Extension data (né Extra data) yet do not have hard-coded signatures. Deprecate the terminology of "Unsigned" when used for transactions/extrinsics owing to there now being "proper" unsigned transactions which obey the extension framework and "old-style" unsigned which do not. Instead we have __*General*__ for the former and __*Bare*__ for the latter. (Ultimately, the latter will be phased out as a type of transaction, and Bare will only be used for Inherents.) Types of extrinsic are now therefore: - Bare (no hardcoded signature, no Extra data; used to be known as "Unsigned") - Bare transactions (deprecated): Gossiped, validated with `ValidateUnsigned` (deprecated) and the `_bare_compat` bits of `TransactionExtension` (deprecated). - Inherents: Not gossiped, validated with `ProvideInherent`. - Extended (Extra data): Gossiped, validated via `TransactionExtension`. - Signed transactions (with a hardcoded signature). - General transactions (without a hardcoded signature). `TransactionExtension` differs from `SignedExtension` because: - A signature on the underlying transaction may validly not be present. - It may alter the origin during validation. - `pre_dispatch` is renamed to `prepare` and need not contain the checks present in `validate`. - `validate` and `prepare` is passed an `Origin` rather than a `AccountId`. - `validate` may pass arbitrary information into `prepare` via a new user-specifiable type `Val`. - `AdditionalSigned`/`additional_signed` is renamed to `Implicit`/`implicit`. It is encoded *for the entire transaction* and passed in to each extension as a new argument to `validate`. This facilitates the ability of extensions to acts as underlying crypto. There is a new `DispatchTransaction` trait which contains only default function impls and is impl'ed for any `TransactionExtension` impler. It provides several utility functions which reduce some of the tedium from using `TransactionExtension` (indeed, none of its regular functions should now need to be called directly). Three transaction version discriminator ("versions") are now permissible: - 0b000000100: Bare (used to be called "Unsigned"): contains Signature or Extra (extension data). After bare transactions are no longer supported, this will strictly identify an Inherents only. - 0b100000100: Old-school "Signed" Transaction: contains Signature and Extra (extension data). - 0b010000100: New-school "General" Transaction: contains Extra (extension data), but no Signature. For the New-school General Transaction, it becomes trivial for authors to publish extensions to the mechanism for authorizing an Origin, e.g. through new kinds of key-signing schemes, ZK proofs, pallet state, mutations over pre-authenticated origins or any combination of the above. ## Code Migration ### NOW: Getting it to build Wrap your `SignedExtension`s in `AsTransactionExtension`. This should be accompanied by renaming your aggregate type in line with the new terminology. E.g. Before: ```rust /// The SignedExtension to the basic transaction logic. pub type SignedExtra = ( /* snip */ MySpecialSignedExtension, ); /// Unchecked extrinsic type as expected by this runtime. pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, RuntimeCall, Signature, SignedExtra>; ``` After: ```rust /// The extension to the basic transaction logic. pub type TxExtension = ( /* snip */ AsTransactionExtension<MySpecialSignedExtension>, ); /// Unchecked extrinsic type as expected by this runtime. pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, RuntimeCall, Signature, TxExtension>; ``` You'll also need to alter any transaction building logic to add a `.into()` to make the conversion happen. E.g. Before: ```rust fn construct_extrinsic( /* snip */ ) -> UncheckedExtrinsic { let extra: SignedExtra = ( /* snip */ MySpecialSignedExtension::new(/* snip */), ); let payload = SignedPayload::new(call.clone(), extra.clone()).unwrap(); let signature = payload.using_encoded(|e| sender.sign(e)); UncheckedExtrinsic::new_signed( /* snip */ Signature::Sr25519(signature), extra, ) } ``` After: ```rust fn construct_extrinsic( /* snip */ ) -> UncheckedExtrinsic { let tx_ext: TxExtension = ( /* snip */ MySpecialSignedExtension::new(/* snip */).into(), ); let payload = SignedPayload::new(call.clone(), tx_ext.clone()).unwrap(); let signature = payload.using_encoded(|e| sender.sign(e)); UncheckedExtrinsic::new_signed( /* snip */ Signature::Sr25519(signature), tx_ext, ) } ``` ### SOON: Migrating to `TransactionExtension` Most `SignedExtension`s can be trivially converted to become a `TransactionExtension`. There are a few things to know. - Instead of a single trait like `SignedExtension`, you should now implement two traits individually: `TransactionExtensionBase` and `TransactionExtension`. - Weights are now a thing and must be provided via the new function `fn weight`. #### `TransactionExtensionBase` This trait takes care of anything which is not dependent on types specific to your runtime, most notably `Call`. - `AdditionalSigned`/`additional_signed` is renamed to `Implicit`/`implicit`. - Weight must be returned by implementing the `weight` function. If your extension is associated with a pallet, you'll probably want to do this via the pallet's existing benchmarking infrastructure. #### `TransactionExtension` Generally: - `pre_dispatch` is now `prepare` and you *should not reexecute the `validate` functionality in there*! - You don't get an account ID any more; you get an origin instead. If you need to presume an account ID, then you can use the trait function `AsSystemOriginSigner::as_system_origin_signer`. - You get an additional ticket, similar to `Pre`, called `Val`. This defines data which is passed from `validate` into `prepare`. This is important since you should not be duplicating logic from `validate` to `prepare`, you need a way of passing your working from the former into the latter. This is it. - This trait takes two type parameters: `Call` and `Context`. `Call` is the runtime call type which used to be an associated type; you can just move it to become a type parameter for your trait impl. `Context` is not currently used and you can safely implement over it as an unbounded type. - There's no `AccountId` associated type any more. Just remove it. Regarding `validate`: - You get three new parameters in `validate`; all can be ignored when migrating from `SignedExtension`. - `validate` returns a tuple on success; the second item in the tuple is the new ticket type `Self::Val` which gets passed in to `prepare`. If you use any information extracted during `validate` (off-chain and on-chain, non-mutating) in `prepare` (on-chain, mutating) then you can pass it through with this. For the tuple's last item, just return the `origin` argument. Regarding `prepare`: - This is renamed from `pre_dispatch`, but there is one change: - FUNCTIONALITY TO VALIDATE THE TRANSACTION NEED NOT BE DUPLICATED FROM `validate`!! - (This is different to `SignedExtension` which was required to run the same checks in `pre_dispatch` as in `validate`.) Regarding `post_dispatch`: - Since there are no unsigned transactions handled by `TransactionExtension`, `Pre` is always defined, so the first parameter is `Self::Pre` rather than `Option<Self::Pre>`. If you make use of `SignedExtension::validate_unsigned` or `SignedExtension::pre_dispatch_unsigned`, then: - Just use the regular versions of these functions instead. - Have your logic execute in the case that the `origin` is `None`. - Ensure your transaction creation logic creates a General Transaction rather than a Bare Transaction; this means having to include all `TransactionExtension`s' data. - `ValidateUnsigned` can still be used (for now) if you need to be able to construct transactions which contain none of the extension data, however these will be phased out in stage 2 of the Transactions Horizon, so you should consider moving to an extension-centric design. ## TODO - [x] Introduce `CheckSignature` impl of `TransactionExtension` to ensure it's possible to have crypto be done wholly in a `TransactionExtension`. - [x] Deprecate `SignedExtension` and move all uses in codebase to `TransactionExtension`. - [x] `ChargeTransactionPayment` - [x] `DummyExtension` - [x] `ChargeAssetTxPayment` (asset-tx-payment) - [x] `ChargeAssetTxPayment` (asset-conversion-tx-payment) - [x] `CheckWeight` - [x] `CheckTxVersion` - [x] `CheckSpecVersion` - [x] `CheckNonce` - [x] `CheckNonZeroSender` - [x] `CheckMortality` - [x] `CheckGenesis` - [x] `CheckOnlySudoAccount` - [x] `WatchDummy` - [x] `PrevalidateAttests` - [x] `GenericSignedExtension` - [x] `SignedExtension` (chain-polkadot-bulletin) - [x] `RefundSignedExtensionAdapter` - [x] Implement `fn weight` across the board. - [ ] Go through all pre-existing extensions which assume an account signer and explicitly handle the possibility of another kind of origin. - [x] `CheckNonce` should probably succeed in the case of a non-account origin. - [x] `CheckNonZeroSender` should succeed in the case of a non-account origin. - [x] `ChargeTransactionPayment` and family should fail in the case of a non-account origin. - [ ] - [x] Fix any broken tests. --------- Signed-off-by: georgepisaltu <george.pisaltu@parity.io> Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> Signed-off-by: dependabot[bot] <support@github.com> Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io> Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> Co-authored-by: Nikhil Gupta <17176722+gupnik@users.noreply.github.com> Co-authored-by: georgepisaltu <52418509+georgepisaltu@users.noreply.github.com> Co-authored-by: Chevdor <chevdor@users.noreply.github.com> Co-authored-by: Bastian Köcher <git@kchr.de> Co-authored-by: Maciej <maciej.zyszkiewicz@parity.io> Co-authored-by: Javier Viola <javier@parity.io> Co-authored-by: Marcin S. <marcin@realemail.net> Co-authored-by: Tsvetomir Dimitrov <tsvetomir@parity.io> Co-authored-by: Javier Bullrich <javier@bullrich.dev> Co-authored-by: Koute <koute@users.noreply.github.com> Co-authored-by: Adrian Catangiu <adrian@parity.io> Co-authored-by: Vladimir Istyufeev <vladimir@parity.io> Co-authored-by: Ross Bulat <ross@parity.io> Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com> Co-authored-by: Liam Aharon <liam.aharon@hotmail.com> Co-authored-by: Svyatoslav Nikolsky <svyatonik@gmail.com> Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com> Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: s0me0ne-unkn0wn <48632512+s0me0ne-unkn0wn@users.noreply.github.com> Co-authored-by: ordian <write@reusable.software> Co-authored-by: Sebastian Kunert <skunert49@gmail.com> Co-authored-by: Aaro Altonen <48052676+altonen@users.noreply.github.com> Co-authored-by: Dmitry Markin <dmitry@markin.tech> Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com> Co-authored-by: Alexander Samusev <41779041+alvicsam@users.noreply.github.com> Co-authored-by: Julian Eager <eagr@tutanota.com> Co-authored-by: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com> Co-authored-by: Davide Galassi <davxy@datawok.net> Co-authored-by: Dónal Murray <donal.murray@parity.io> Co-authored-by: yjh <yjh465402634@gmail.com> Co-authored-by: Tom Mi <tommi@niemi.lol> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Will | Paradox | ParaNodes.io <79228812+paradox-tt@users.noreply.github.com> Co-authored-by: Bastian Köcher <info@kchr.de> Co-authored-by: Joshy Orndorff <JoshOrndorff@users.noreply.github.com> Co-authored-by: Joshy Orndorff <git-user-email.h0ly5@simplelogin.com> Co-authored-by: PG Herveou <pgherveou@gmail.com> Co-authored-by: Alexander Theißen <alex.theissen@me.com> Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com> Co-authored-by: Juan Girini <juangirini@gmail.com> Co-authored-by: bader y <ibnbassem@gmail.com> Co-authored-by: James Wilson <james@jsdw.me> Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> Co-authored-by: asynchronous rob <rphmeier@gmail.com> Co-authored-by: Parth <desaiparth08@gmail.com> Co-authored-by: Andrew Jones <ascjones@gmail.com> Co-authored-by: Jonathan Udd <jonathan@dwellir.com> Co-authored-by: Serban Iorga <serban@parity.io> Co-authored-by: Egor_P <egor@parity.io> Co-authored-by: Branislav Kontur <bkontur@gmail.com> Co-authored-by: Evgeny Snitko <evgeny@parity.io> Co-authored-by: Just van Stam <vstam1@users.noreply.github.com> Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com> Co-authored-by: gupnik <nikhilgupta.iitk@gmail.com> Co-authored-by: dzmitry-lahoda <dzmitry@lahoda.pro> Co-authored-by: zhiqiangxu <652732310@qq.com> Co-authored-by: Nazar Mokrynskyi <nazar@mokrynskyi.com> Co-authored-by: Anwesh <anweshknayak@gmail.com> Co-authored-by: cheme <emericchevalier.pro@gmail.com> Co-authored-by: Sam Johnson <sam@durosoft.com> Co-authored-by: kianenigma <kian@parity.io> Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com> Co-authored-by: Muharem <ismailov.m.h@gmail.com> Co-authored-by: joepetrowski <joe@parity.io> Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com> Co-authored-by: Gabriel Facco de Arruda <arrudagates@gmail.com> Co-authored-by: Squirrel <gilescope@gmail.com> Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com> Co-authored-by: georgepisaltu <george.pisaltu@parity.io> Co-authored-by: command-bot <> |
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Muharem
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4f832ea865 |
pallet-asset-conversion: Decoupling Native Currency Dependancy (#2031)
closes https://github.com/paritytech/polkadot-sdk/issues/1842 Decoupling Pallet from the Concept of Native Currency Currently, the pallet is intrinsically linked with the concept of native currency, requiring users to provide implementations of the `fungible::*` and `fungibles::*` traits to interact with native and non native assets. This incapsulates some non-related to the pallet complexity and makes it less adaptable in contexts where the native currency concept is absent. With this PR, the dependence on `fungible::*` for liquidity-supplying assets has been removed. Instead, the native and non-native currencies' handling is now overseen by a single type that implements the `fungibles::*` traits. To simplify this integration, types have been introduced to facilitate the creation of a union between `fungible::*` and `fungibles::*` implementations, producing a unified `fungibles::*` type. One of the reasons driving these changes is the ambition to create a more user-friendly API for the `SwapCredit` implementation. Given that it interacts with two distinct credit types from `fungible` and `fungibles`, a unified type was introduced. Clients now manage potential conversion failures for those credit types. In certain contexts, it's vital to guarantee that operations are fail-safe, like in this impl - [PR](https://github.com/paritytech/polkadot-sdk/pull/1845), place in [code](https://github.com/paritytech/polkadot-sdk/blob/20b85a5fada8f55c98ba831964f5866ffeadf4da/cumulus/primitives/utility/src/lib.rs#L429). Additional Updates: - abstracted the pool ID and its account derivation logic via trait bounds, along with common implementation offerings; - removed `inc_providers` on a pool creation for the pool account; - benchmarks: -- swap complexity is N, not const; -- removed `From<u128> + Into<u128>` bound from `T::Balance`; -- removed swap/liquidity/.. amount constants, resolve them dynamically based on pallet configuration; -- migrated to v2 API; - `OnUnbalanced` handler for the pool creation fee, replacing direct transfers to a specified account ID; - renamed `MultiAssetId` to `AssetKind` aligning with naming across frame crates; related PRs: - (depends) https://github.com/paritytech/polkadot-sdk/pull/1677 - (caused) https://github.com/paritytech/polkadot-sdk/pull/2033 - (caused) https://github.com/paritytech/polkadot-sdk/pull/1876 --------- Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> Co-authored-by: Liam Aharon <liam.aharon@hotmail.com> |
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Branislav Kontur
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649be3aaaa |
Asset conversion get_pool_id fix (Ord does not count with is_native flag) (#14572)
* Asset conversion `get_pool_id` fix (`Ord` does not count with `is_native` flag) * Removed unnecessery clones + added `pool_account` to `PoolCreated` event * Fix bench compile * Fix bench * Improved `MultiAssetIdConverter::try_convert` * Removed `into_multiasset_id` from converter and moved to `BenchmarkHelper` * ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_asset_conversion * Fixed doc * Typo * Removed `NativeOrAssetId` (test/mock) impl from types.rs to mock.rs... * Typo + 0u32 -> 0 * Update frame/asset-conversion/src/benchmarking.rs Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com> * Typo * ".git/.scripts/commands/fmt/fmt.sh" * Fix from Jegor * Try to fix the other failing benchmark * ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_asset_conversion * Update frame/asset-conversion/src/lib.rs Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update frame/asset-conversion/src/types.rs Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update frame/transaction-payment/asset-conversion-tx-payment/src/mock.rs Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update frame/asset-conversion/src/mock.rs Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update bin/node/runtime/src/impls.rs Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update frame/asset-conversion/src/lib.rs Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Update bin/node/runtime/src/impls.rs Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> * Reverted NativeOrAssetId --------- Co-authored-by: command-bot <> Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com> Co-authored-by: Jegor Sidorenko <jegor@parity.io> Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> |
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Jegor Sidorenko
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26d8e65910 |
Handle the AllowMultiAssetPools=false case in benchmarks (#14590)
* Handle the AllowMultiAssetPools=false case in benchmarks * ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_asset_conversion --------- Co-authored-by: command-bot <> |
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Oleg Plakida
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0aa79f87ca |
".git/.scripts/commands/bench-vm/bench-vm.sh" all (#13933)
Co-authored-by: command-bot <> |
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Squirrel
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ef1e4e8b2b |
Asset Conversion pallet (#12984)
* Add pallet dex
* Fmt
* Add RPC endpoint
* Fix RPC
* Fix the build
* Some more fixes
* Add a method to topup pallet's account
* Add support for multi-currency into Uniques
* Fix the build
* Add [transactional] + setup() + fix balances
* Improve tests
* Fix price quotation
* Code clean up
* Validate swaps
* Fmt
* Update README
* add test
* mint LP assets in a different instance
* remove transactional as now the default
AssetsLocal renamed to Assets
* merge master
* Revert "Merge master"
* fix tests post merge.
* attempt to set create origin
* Internally allocate lp asset id.
* Simplify
* Bump to be in line
* additional bumps to make compile
* fix compile
* less bounds
* use fungible crates
* multiasset enum
* only allow native currency pairs
* added slippage tests
* transfer into separate method
(Also fee not set in 2 places now.)
Added test where lp and user are different users.
* Add benchmarks + weights
* Typos
* Clean up
* More tests,
split error into two because it wasn't clear which parameter.
renamed liquidity to lp_tokens_minted or lp_tokens_burned in events.
* tighten up naming
* Default, zero, square root traits not needed
Also let's not force people to be compact
* add keep-alive param
* add insufficient liquidity test
* Fix quote() to support u64
* Avoid recording balances twice
* cargo fmt
* Didn't mean to change error type
* temp
* Less
* Rework get_amount_in/get_amount_out
* Convert other places
* Rework the last piece
* Typo
* Fix benchmarks
* use hash trait
* Extract a native asset check into the runtime setting
* Don't set the metadata
* Remove spec file
* Enable multi-assets swaps by default
* Refactor conversion into u128
* Add path param to swap_token_for_exact_tokens
* Fix typo + a bit of refactoring
* Implement path param for swap_exact_tokens_for_tokens()
* Deref
* Minor fixes
* Add test with sensible scale values
* Use .windows()
* Fix benchmarks
* update docs
* Fix everything :)
* Chore
* Revert
* Chore
* prev way of creating sub accounts lead to collisions
* Update frame/dex/src/lib.rs
Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>
* Update frame/dex/src/lib.rs
Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>
* Chore
* Fmt fix on Uniques
* add call_index
bring code up to date with latest master
* revert readme changes
* add cr
* revert uniques changes
* reducing noise
* no need for deadline (#12990)
(there's generic transaction deadline functionality already)
* fix kitchen sink (#12991)
* fix kitchen sink
* Only the dex can mint lp_tokens
* add BenchmarkHelper for second instance (#12998)
* update mock to latest master
* less indirections (#13012)
* remove dex PR's custom RPC (#13050)
* As we have state_call we don't need a custom RPC
* fix docs
* no longer a need to upgrade rpc version (#13053)
* add CallbackHadle
* quote bugfix (#13191)
quote was giving same price in both directions as we were inverting needlessly.
* merging in dex specific changes due to pay by dex
* update lock file
* merging in kitchen sink changes
* Add get_reserves() api method
* Partial updating of the benchmarks
* Fix tests
* clippy
* Temp fix weights
* Fix benchmarks
* Add pool setup fee
* Money upfront
* Address some comments
* Use u128 in mock
* Fix benchmarks
* Change error message
* Update comments
* Change error names
* Implement PartialOrd for NativeOrAssetId
* add note
* Update errors
* More tests for assets sorting
* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_dex
* Change the way we generate pool accounts
* Improve the liquidity removal method
* Extract MintMinLiquidity to config, rework all tests
* Add comments
* Validate provided amount
* Rename to asset-conversion
* Validate ED
* Improve handling the ED related errors
* typos
* Try to fix benchmarks
* Another try
* Another day, another try
* Fix benchmarks
* Expose fee related params
* Validate token's minimal amount the same way as ED
* fix typo
* Use longer path for swaps in benchmarks
* need to ref sp_std's vec.
* Remove From<u32> requirement when benchmarking
* impl BenchmarkHelper for ()
* only for runtime benchmarks
* MultiLocation: !MaybeDisplay
Looks like we might not need this bound from initial testing.
* Update frame/asset-conversion/src/lib.rs
Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>
* Update frame/asset-conversion/src/lib.rs
Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>
* Add documentation links
* add collision test
* Revert "[Enhancement] Throw an error when there are too many pallets (#13763)"
This reverts commit
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