cmd/jsutils: add a tool to get slash count (ethereum#2569)

cmd/jsutils/README.md

@@ -35,4 +35,13 @@ output as following
 Get the performance between [ 19470 , 19670 )
 txCountPerBlock = 3142.81 txCountTotal = 628562 BlockCount = 200 avgBlockTime = 3.005 inturnBlocksRatio = 0.975
 txCountPerSecond = 1045.8602329450914 avgGasUsedPerBlock = 250.02062627 avgGasUsedPerSecond =  83.20153952412646
-```
+```
+
+### 4. Get validators slash count
+```bash
+use the latest block 
+node getslashcount.js --Rpc ${ArchiveRpc} 
+use a block number
+node getslashcount.js --Rpc ${ArchiveRpc} --Num ${blockNum}
+```
+

cmd/jsutils/getslashcount.js

@@ -0,0 +1,40 @@
+import { ethers } from "ethers";
+import program from "commander";
+
+program.option("--Rpc <Rpc>", "Rpc");
+program.option("--Num <Num>", "num", 0)
+program.parse(process.argv);
+
+const provider = new ethers.JsonRpcProvider(program.Rpc);
+
+const slashAbi = [
+    "function getSlashIndicator(address validatorAddr) external view returns (uint256, uint256)"
+]
+const validatorSetAbi = [
+    "function getLivingValidators() external view returns (address[], bytes[])"
+]
+const addrValidatorSet = '0x0000000000000000000000000000000000001000';
+const addrSlash = '0x0000000000000000000000000000000000001001';
+const validatorSet = new ethers.Contract(addrValidatorSet, validatorSetAbi, provider);
+const slashIndicator = new ethers.Contract(addrSlash, slashAbi,  provider)
+
+
+const main = async () => {
+    let blockNum = ethers.getNumber(program.Num)
+    if (blockNum === 0) {
+       blockNum = await provider.getBlockNumber()
+    }
+    let block = await provider.getBlock(blockNum)
+    console.log("current block", blockNum, "time", block.date)
+    const data = await validatorSet.getLivingValidators({blockTag:blockNum})
+    for (let i = 0; i < data[0].length; i++) {
+        let addr = data[0][i];
+        let info = await slashIndicator.getSlashIndicator(addr, {blockTag:blockNum})
+        console.log("index:", i, "address:", addr, "slashes:", ethers.toNumber(info[1]))
+    }
+};
+main().then(() => process.exit(0))
+    .catch((error) => {
+        console.error(error);
+        process.exit(1);
+    });