// creates and returns a History object by calling Eth functions GetFileAddressGivenId
// and GetNumberOfReceipts, which are used to loop a series of calls to
// GetReceiptAddressAtIndex, GetVerificationDateTime, and GetVerifiedBy
public async Task <History> GetHistory(string registryAddress, string fileId)
{
History history = new History();
// get address of file contract with corresponding fileid
string fileAddress = await GetFileAddressGivenId.SendRequestAsync(MyWeb3, registryAddress, fileId);
// call number of receipts function on file contract
int numReceipts = await GetNumberOfReceipts.SendRequestAsync(MyWeb3, fileAddress);
// for each receipt
for (int i = 0; i < numReceipts; ++i)
{
// get receipt address at index
string receiptAddress = await GetReceiptAddressAtIndex.SendRequestAsync(MyWeb3, fileAddress, i);
// get datetime
string dateTime = await GetVerificationDateTime.SendRequestAsync(MyWeb3, receiptAddress);
// get state of receipt
string state = StateConvert.IntToString(await GetState.SendRequestAsync(MyWeb3, receiptAddress));
// get user that created receipt
string verifiedBy = await GetVerifiedBy.SendRequestAsync(MyWeb3, receiptAddress);
// add values to History object
history.AddLine(dateTime, state, verifiedBy);
}
return(history);
}
// returns state
private async Task <int> NewReceiptPrivate(string registryAddress, string fileId, string fileHash,
string metadataHash, string verifiedBy)
{
// deploy new receipt contract to blockchain
string receiptAddress = await DeployReceipt.SendRequestAsync(MyWeb3, registryAddress, fileId,
fileHash, metadataHash, verifiedBy);
// get state of receipt
return(await GetState.SendRequestAsync(MyWeb3, receiptAddress));
}