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 <[email protected]>

* Update frame/dex/src/lib.rs

Co-authored-by: Jegor Sidorenko <[email protected]>

* 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 <[email protected]>

* Update frame/asset-conversion/src/lib.rs

Co-authored-by: Jegor Sidorenko <[email protected]>

* Add documentation links

* add collision test

* Revert "[Enhancement] Throw an error when there are too many pallets (#13763)"

This reverts commit cc3152bc

.

* [Enhancement] Throw an error when there are too many pallets (#13763)

* [Enhancement] Throw an error when there are too many pallets

* fix ui test

* fix PR comments

* Update frame/support/procedural/src/construct_runtime/mod.rs

Co-authored-by: Bastian Köcher <[email protected]>

* Update frame/support/procedural/src/construct_runtime/mod.rs

Co-authored-by: Bastian Köcher <[email protected]>

* ".git/.scripts/commands/fmt/fmt.sh"

---------

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: command-bot <>

* add benchmark helper

+ doc fix

* cargo fmt

* Fix adding liquidity to non-empty pool

* Fix compilation error

* Fix params ordering issue

* additional docs

* The swap path elements should be unique

* Fix account collision

* Validate all the pool in a swap path are unique

* Change the way we add liquidity to empty pools

* Improve docs

* remove unnessisary Display impl

* cargo fmt

* remove unused imports

* Make api consistent

* Chore

* Touch the pool account so it could hold the pair tokens

* Check the balance before touching the pool's account

* Introduce liquidity provision fee

* Touch the pool acc one more time

* Apply suggestions from code review

Co-authored-by: Sam Johnson <[email protected]>

* Update frame/asset-conversion/README.md

Co-authored-by: Sam Johnson <[email protected]>

* Use ContainsPair instead of the balance checker

* Remove old Currency trait

* Add liquidity withdrawal fee

* Update docs

* Use 0 withdrawal fee in mock

* Rename vars

* asset id not clone

* fix: shadow var was being used

* correct tests

* fix benches

* merge master

* neater

---------

Co-authored-by: Jegor Sidorenko <[email protected]>
Co-authored-by: Jegor Sidorenko <[email protected]>
Co-authored-by: parity-processbot <>
Co-authored-by: Roman Useinov <[email protected]>
Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Sam Johnson <[email protected]>