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_Chainlink client refactored into library and all unused functions removed Uses price aggregator facet of multi collat diamond for storage. Copy of https://github.com/smartcontractkit/chainlink/blob/contracts-v0.5.1/contracts/src/v0.8/ChainlinkClient.sol with only requestCount changed to unset so as to be inherited by a proxy implementation._

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ChainlinkRequested

event ChainlinkRequested(bytes32 id)

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ChainlinkFulfilled

event ChainlinkFulfilled(bytes32 id)

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_getSlot

function _getSlot() internal pure returns (uint256)
Returns storage slot to use when fetching storage relevant to library

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_getStorage

function _getStorage() internal pure returns (struct IPriceAggregator.PriceAggregatorStorage s)
Returns storage pointer for storage struct in diamond contract, at defined slot

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buildChainlinkRequest

function buildChainlinkRequest(bytes32 specId, address callbackAddr, bytes4 callbackFunctionSignature) internal pure returns (struct Chainlink.Request)
Creates a request that can hold additional parameters

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Parameters

NameTypeDescription
specIdbytes32The Job Specification ID that the request will be created for
callbackAddraddressaddress to operate the callback on
callbackFunctionSignaturebytes4function signature to use for the callback

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Return Values

NameTypeDescription
[0]struct Chainlink.RequestA Chainlink Request struct in memory

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sendChainlinkRequestTo

function sendChainlinkRequestTo(address oracleAddress, struct Chainlink.Request req, uint256 payment) internal returns (bytes32 requestId)
Creates a Chainlink request to the specified oracle address Generates and stores a request ID, increments the local nonce, and uses transferAndCall to send LINK which creates a request on the target oracle contract. Emits ChainlinkRequested event.

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Parameters

NameTypeDescription
oracleAddressaddressThe address of the oracle for the request
reqstruct Chainlink.RequestThe initialized Chainlink Request
paymentuint256The amount of LINK to send for the request

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Return Values

NameTypeDescription
requestIdbytes32The request ID

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setChainlinkToken

function setChainlinkToken(address _linkErc677) internal
Sets the LINK token address

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Parameters

NameTypeDescription
_linkErc677addressThe address of the LINK token contract

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validateChainlinkCallback

function validateChainlinkCallback(bytes32 requestId) internal
Ensures that the fulfillment is valid for this contract Use if the contract developer prefers methods instead of modifiers for validation

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Parameters

NameTypeDescription
requestIdbytes32The request ID for fulfillment

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recordChainlinkFulfillment

modifier recordChainlinkFulfillment(bytes32 requestId)
Reverts if the sender is not the oracle of the request. Emits ChainlinkFulfilled event.

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Parameters

NameTypeDescription
requestIdbytes32The request ID for fulfillment