pedroduartecosta

//triggered when there's a consensus on the final result
event UpdatedRequest (
  uint id,
  string urlToQuery,
  string attributeToFetch,
  string agreedValue
);

pedroduartecosta

//called by the oracle to record its answer
function updateRequest (
  uint _id,
  string memory _valueRetrieved
) public {

  Request storage currRequest = requests[_id];

  //check if oracle is in the list of trusted oracles
  //and if the oracle hasn't voted yet

pedroduartecosta

//event that triggers oracle outside of the blockchain
 event NewRequest (
  uint id, 
  string urlToQuery,
  string attributeToFetch
 );

pedroduartecosta

function createRequest (
  string memory _urlToQuery,
  string memory _attributeToFetch
)
public
{
  uint lenght = requests.push(Request(currentId, _urlToQuery, _attributeToFetch, ""));
  Request storage r = requests[lenght-1];

  // Hardcoded oracles address

pedroduartecosta

// defines a general api request
struct Request {
  uint id;                          //request id
  string urlToQuery;                //API url
  string attributeToFetch;          //json attribute (key) to retrieve in the response
  string agreedValue;               //value from key
  mapping(uint => string) anwers;   //answers provided by the oracles
  mapping(address => uint) quorum;  //oracles which will query the answer (1=oracle hasn't voted, 2=oracle has voted)
}

pedroduartecosta

pragma solidity >=0.4.21 <0.6.0;

contract Oracle {
  Request[] requests; //list of requests made to the contract
  uint currentId = 0; //increasing request id
  uint minQuorum = 2; //minimum number of responses to receive before declaring final result
  uint totalOracleCount = 3; // Hardcoded oracle count
}

pedroduartecosta

• Latex Workspace
• Code spell checker
• Code Time
• Excel Viewer
• Git Graph
• Git lens
• Path Intellisens
• Rainbow CSV
• Todo Tree
• VSCode Spotify

pedroduartecosta

Keybase proof

I hereby claim:

• I am pedroduartecosta on github.
• I am pedroc (https://keybase.io/pedroc) on keybase.
• I have a public key ASAzPvCsscwUOE487ulXNKdyfk-Vfu-9gwYaWGmGJq1f-wo

To claim this, I am signing this object:

pedroduartecosta

{"lastUpload":"2019-04-22T16:12:57.533Z","extensionVersion":"v3.2.9"}

pedroduartecosta

val holdout = model.transform(test).select("prediction", "DelayOutputVar")

val rm = new RegressionMetrics(holdout.rdd.map(x =>
  (x(0).asInstanceOf[Double], x(1).asInstanceOf[Double])))

println("sqrt(MSE): " + Math.sqrt(rm.meanSquaredError))
println("mean absolute error: " + 	rm.meanAbsoluteError)
println("R Squared: " + rm.r2)                         
println("Explained Variance: " + rm.explainedVariance + "\n")