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Using Berry Sample
Sample project UsingBerry
The Berry oracle is a decentralized oracle on Binance Smart Chain. It provides an option for contracts to securely interact with and obtain data from off-chain.
Quick references are included below:
How to use
1. Clone the project and install dependencies
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git clone [email protected]:berrydata/SampleUsingBerry.git
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npm install
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2. How to Use
Just Inherit the UsingBerry contract, passing the Berry address as a constructor argument:
Here's an example
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contract BtcPriceContract is UsingBerry {
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//This Contract now have access to all functions on UsingBerry
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uint256 btcPrice;
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uint256 btcRequetId = 1;
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constructor(address payable _berryAddress) UsingBerry(_berryAddress) public {}
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function setBtcPrice() public {
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bool _didGet;
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uint _timestamp;
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uint _value;
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(_didGet, btcPrice, _timestamp) = getCurrentValue(btcRequetId);
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}
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}
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Addresses:
3. The sample contract SampleUsingBerry have access to the following Berry functions:
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/**
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* @dev Retreive value from oracle based on requestId/timestamp
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* @param _requestId being requested
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* @param _timestamp to retreive data/value from
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* @return uint value for requestId/timestamp submitted
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*/
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function retrieveData(uint256 _requestId, uint256 _timestamp) public view returns(uint256);
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/**
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* @dev Gets if the mined value for the specified requestId/_timestamp is currently under dispute
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* @param _requestId to looku p
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* @param _timestamp is the timestamp to look up miners for
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* @return bool true if requestId/timestamp is under dispute
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*/
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function isInDispute(uint256 _requestId, uint256 _timestamp) public view returns(bool);
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/**
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* @dev Counts the number of values that have been submited for the request
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* @param _requestId the requestId to look up
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* @return uint count of the number of values received for the requestId
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*/
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function getNewValueCountbyRequestId(uint256 _requestId) public view returns(uint);
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/**
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* @dev Gets the timestamp for the value based on their index
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* @param _requestId is the requestId to look up
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* @param _index is the value index to look up
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* @return uint timestamp
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*/
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function getTimestampbyRequestIDandIndex(uint256 _requestId, uint256 _index) public view returns(uint256);
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/**
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* @dev Allows the user to get the latest value for the requestId specified
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* @param _requestId is the requestId to look up the value for
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* @return bool true if it is able to retreive a value, the value, and the value's timestamp
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*/
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function getCurrentValue(uint256 _requestId) public view returns (bool ifRetrieve, uint256 value, uint256 _timestampRetrieved);
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/**
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* @dev Allows the user to get the first value for the requestId before the specified timestamp
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* @param _requestId is the requestId to look up the value for
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* @param _timestamp before which to search for first verified value
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* @return bool true if it is able to retreive a value, the value, and the value's timestamp
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*/
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function getDataBefore(uint256 _requestId, uint256 _timestamp)
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public
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view
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returns (bool _ifRetrieve, uint256 _value, uint256 _timestampRetrieved);
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5. To run tests:
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npm run test
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6. Migrations:
Just run truffle migrate with the desired Network
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truffle migrate
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Last modified 11mo ago
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Contents
How to use