const syncRequest = require("sync-request");
/**
* A set of sync RPC calls. Synchronicity is necessary to handle build tools that
* revert between test runner blocks (like `suite`). Mocha doesn't support async methods
* in the reporter hook and no modern ethereum providers (web3, ethers) support sync methods
* either so we need to execute them ourselves
*
* @author: Alex Rea, <github.com/area>
*/
class Sync {
constructor(url) {
this.url = url;
}
getNetworkId() {
return this.request("net_version", []);
}
getCode(address) {
return this.request("eth_getCode", [address, "latest"]);
}
blockNumber() {
const val = this.request("eth_blockNumber", []);
return parseInt(val, 16);
}
getLatestBlock() {
return this.request("eth_getBlockByNumber", ["latest", false]);
}
getBlockByNumber(number) {
const hexNumber = `0x${number.toString(16)}`;
return this.request("eth_getBlockByNumber", [hexNumber, true]);
}
blockNumber() {
const block = this.getLatestBlock();
return parseInt(block.number, 16);
}
getTransactionByHash(tx) {
return this.request("eth_getTransactionByHash", [tx]);
}
getTransactionReceipt(tx) {
return this.request("eth_getTransactionReceipt", [tx]);
}
call(payload, blockNumber) {
return this.request("eth_call", [payload, blockNumber]);
}
request(method, params) {
const payload = {
json: {
jsonrpc: "2.0",
method: method,
params: params,
id: 1
}
};
const res = syncRequest("POST", this.url, payload);
return JSON.parse(res.getBody("utf8")).result;
}
}
module.exports = Sync;
