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Price Oracle (XLS-47d): (XRPLF#4789) (XRPLF#4789)
Implement native support for Price Oracles. A Price Oracle is used to bring real-world data, such as market prices, onto the blockchain, enabling dApps to access and utilize information that resides outside the blockchain. Add Price Oracle functionality: - OracleSet: create or update the Oracle object - OracleDelete: delete the Oracle object To support this functionality add: - New RPC method, `get_aggregate_price`, to calculate aggregate price for a token pair of the specified oracles - `ltOracle` object The `ltOracle` object maintains: - Oracle Owner's account - Oracle's metadata - Up to ten token pairs with the scaled price - The last update time the token pairs were updated Add Oracle unit-tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| //------------------------------------------------------------------------------ | ||
| /* | ||
| This file is part of rippled: https://github.com/ripple/rippled | ||
| Copyright (c) 2023 Ripple Labs Inc. | ||
| Permission to use, copy, modify, and/or distribute this software for any | ||
| purpose with or without fee is hereby granted, provided that the above | ||
| copyright notice and this permission notice appear in all copies. | ||
| THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
| WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
| MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
| ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
| WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
| ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
| OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
| */ | ||
| //============================================================================== | ||
|
|
||
| #include <ripple/app/tx/impl/DeleteOracle.h> | ||
| #include <ripple/ledger/Sandbox.h> | ||
| #include <ripple/ledger/View.h> | ||
| #include <ripple/protocol/Feature.h> | ||
| #include <ripple/protocol/Rules.h> | ||
| #include <ripple/protocol/TxFlags.h> | ||
|
|
||
| namespace ripple { | ||
|
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| NotTEC | ||
| DeleteOracle::preflight(PreflightContext const& ctx) | ||
| { | ||
| if (!ctx.rules.enabled(featurePriceOracle)) | ||
| return temDISABLED; | ||
|
|
||
| if (auto const ret = preflight1(ctx); !isTesSuccess(ret)) | ||
| return ret; | ||
|
|
||
| if (ctx.tx.getFlags() & tfUniversalMask) | ||
| { | ||
| JLOG(ctx.j.debug()) << "Oracle Delete: invalid flags."; | ||
| return temINVALID_FLAG; | ||
| } | ||
|
|
||
| return preflight2(ctx); | ||
| } | ||
|
|
||
| TER | ||
| DeleteOracle::preclaim(PreclaimContext const& ctx) | ||
| { | ||
| if (!ctx.view.exists(keylet::account(ctx.tx.getAccountID(sfAccount)))) | ||
| return terNO_ACCOUNT; | ||
|
|
||
| if (auto const sle = ctx.view.read(keylet::oracle( | ||
| ctx.tx.getAccountID(sfAccount), ctx.tx[sfOracleDocumentID])); | ||
| !sle) | ||
| { | ||
| JLOG(ctx.j.debug()) << "Oracle Delete: Oracle does not exist."; | ||
| return tecNO_ENTRY; | ||
| } | ||
| else if (ctx.tx.getAccountID(sfAccount) != sle->getAccountID(sfOwner)) | ||
| { | ||
| // this can't happen because of the above check | ||
| JLOG(ctx.j.debug()) << "Oracle Delete: invalid account."; | ||
| return tecINTERNAL; | ||
| } | ||
| return tesSUCCESS; | ||
| } | ||
|
|
||
| TER | ||
| DeleteOracle::deleteOracle( | ||
| ApplyView& view, | ||
| std::shared_ptr<SLE> const& sle, | ||
| AccountID const& account, | ||
| beast::Journal j) | ||
| { | ||
| if (!sle) | ||
| return tesSUCCESS; | ||
|
|
||
| if (!view.dirRemove( | ||
| keylet::ownerDir(account), (*sle)[sfOwnerNode], sle->key(), true)) | ||
| { | ||
| JLOG(j.fatal()) << "Unable to delete Oracle from owner."; | ||
| return tefBAD_LEDGER; | ||
| } | ||
|
|
||
| auto const sleOwner = view.peek(keylet::account(account)); | ||
| if (!sleOwner) | ||
| return tecINTERNAL; | ||
|
|
||
| auto const count = | ||
| sle->getFieldArray(sfPriceDataSeries).size() > 5 ? -2 : -1; | ||
|
|
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| adjustOwnerCount(view, sleOwner, count, j); | ||
|
|
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| view.erase(sle); | ||
|
|
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| return tesSUCCESS; | ||
| } | ||
|
|
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| TER | ||
| DeleteOracle::doApply() | ||
| { | ||
| if (auto sle = ctx_.view().peek( | ||
| keylet::oracle(account_, ctx_.tx[sfOracleDocumentID]))) | ||
| return deleteOracle(ctx_.view(), sle, account_, j_); | ||
|
|
||
| return tecINTERNAL; | ||
| } | ||
|
|
||
| } // namespace ripple |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| //------------------------------------------------------------------------------ | ||
| /* | ||
| This file is part of rippled: https://github.com/ripple/rippled | ||
| Copyright (c) 2023 Ripple Labs Inc. | ||
| Permission to use, copy, modify, and/or distribute this software for any | ||
| purpose with or without fee is hereby granted, provided that the above | ||
| copyright notice and this permission notice appear in all copies. | ||
| THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
| WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
| MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
| ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
| WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
| ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
| OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
| */ | ||
| //============================================================================== | ||
|
|
||
| #ifndef RIPPLE_TX_DELETEORACLE_H_INCLUDED | ||
| #define RIPPLE_TX_DELETEORACLE_H_INCLUDED | ||
|
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| #include <ripple/app/tx/impl/Transactor.h> | ||
|
|
||
| namespace ripple { | ||
|
|
||
| /** | ||
| Price Oracle is a system that acts as a bridge between | ||
| a blockchain network and the external world, providing off-chain price data | ||
| to decentralized applications (dApps) on the blockchain. This implementation | ||
| conforms to the requirements specified in the XLS-47d. | ||
| The DeleteOracle transactor implements the deletion of Oracle objects. | ||
| */ | ||
|
|
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| class DeleteOracle : public Transactor | ||
| { | ||
| public: | ||
| static constexpr ConsequencesFactoryType ConsequencesFactory{Normal}; | ||
|
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| explicit DeleteOracle(ApplyContext& ctx) : Transactor(ctx) | ||
| { | ||
| } | ||
|
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| static NotTEC | ||
| preflight(PreflightContext const& ctx); | ||
|
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| static TER | ||
| preclaim(PreclaimContext const& ctx); | ||
|
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| TER | ||
| doApply() override; | ||
|
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| static TER | ||
| deleteOracle( | ||
| ApplyView& view, | ||
| std::shared_ptr<SLE> const& sle, | ||
| AccountID const& account, | ||
| beast::Journal j); | ||
| }; | ||
|
|
||
| } // namespace ripple | ||
|
|
||
| #endif // RIPPLE_TX_DELETEORACLE_H_INCLUDED |
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