blockapps-sample-game

BlockApps Sample Game

Using initfile.json

In addition to naming and versioning your app in metadata.json, you can also use initfile.json to upload contracts during the blockchain and having their addresses available through a javascript library.

{
    "gameContract": {
      "contractName": "SampleGame",
      "contractFilename": "contracts/SampleGame.sol",
      "args": {}
    }
}

For each key supplied in initfile.json, a javascript variable will be created. Strato will use the contractName, contractFilename, and args in order to decide which uploaded contract to use and which arguments to provide to the constructor. In this case, contract SampleGame in contracts/SampleGame.sol has no arguments for its constructor so the empty object will suffice. In other constructors, you should use an object with a key for each parameter to that constructor.

After upload, an addresses.js file will be generated. An example module looks like:

const addresses = {
  gameContract: "81b081f69a1998b3eefcbfde419ec7f57944cf1a",
};

Then to make use of this address, include <script src="addresses.js"></script> in the dapp's index.html so that addresses.gameContract will describe the uploaded contract in javascript blocks:

let callContractMethodUrl = window.location.origin + "/bloc/v2.2/users" +
      path.join(username, userAddress, "contract", contractName,
                addresses.gameContract, "call?resolve");