Check if parameters exist before setting them (#99)

* Check if parameteers exist before setting them

* bump version

* Create GenesisProtocolInterface.sol

contracts/votingMachines/GenesisProtocolInterface.sol

@@ -0,0 +1,11 @@
+pragma solidity 0.5.17;
+
+
+contract GenesisProtocolInterface {
+    function setParameters(
+        uint[11] calldata _params, //use array here due to stack too deep issue.
+        address _voteOnBehalf
+    )
+    external
+    returns(bytes32);
+}

contracts/votingMachines/GenesisProtocolLogic.sol

@@ -264,6 +264,12 @@ contract GenesisProtocolLogic is IntVoteInterface {
         require(_params[9] > 0, "daoBountyConst should be > 0");
 
         bytes32 paramsHash = getParametersHash(_params, _voteOnBehalf);
+
+        if (parameters[paramsHash].queuedVoteRequiredPercentage > 0) {
+            //parameters already been set
+            return paramsHash;
+        }
+
         //set a limit for power for a given alpha to prevent overflow
         uint256 limitExponent = 172;//for alpha less or equal 2
         uint256 j = 2;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@daostack/infra",
-  "version": "0.0.1-rc.19",
+  "version": "0.0.1-rc.20",
   "description": "Base layer DAO's components",
   "files": [
     "contracts/",

test/genesisprotocol.js

@@ -618,6 +618,22 @@ contract('GenesisProtocol', accounts => {
 
   it("Non-existent parameters hash shouldn't work - propose with wrong organization", async function() {
     var testSetup = await setup(accounts);
+    await testSetup.genesisProtocolCallbacks.setParameters(
+      [
+        50,
+        60,
+        60,
+        0,
+        2000,
+        0,
+        60,
+        10,
+        15,
+        1000,
+        0
+      ],
+      helpers.NULL_ADDRESS
+    );
     await testSetup.genesisProtocolCallbacks.propose(2, testSetup.genesisProtocolParams.paramsHash,helpers.NULL_ADDRESS,accounts[0],helpers.NULL_ADDRESS);
 
     try {