add geth miner. Needs to change eth and web3

lib/cmds/blockchain/miner.js

@@ -0,0 +1,165 @@
+const NetcatClient = require('netcat/client');
+
+//Constants
+const minerStart = 'miner_start';
+const minerStop = 'miner_stop';
+const getHashRate = 'miner_getHashrate';
+
+class GethMiner {
+  constructor() {
+    const self = this;
+    // TODO: Find a way to load mining config from YML.
+    // In the meantime, just set an empty config object
+    this.config = {};
+
+    const defaults = {
+      interval_ms: 15000,
+      initial_ether: 15000000000000000000,
+      mine_pending_txns: true,
+      mine_periodically: false,
+      mine_normally: false,
+      threads: 1
+    };
+
+    for (let key in defaults) {
+      if (this.config[key] === undefined) {
+        this.config[key] = defaults[key];
+      }
+    }
+
+    const isWin = process.platform === "win32";
+
+    let ipcPath;
+    if (isWin) {
+      ipcPath = '\\\\.\\pipe\\geth.ipc';
+    } else {
+      ipcPath = this.datadir + '/geth.ipc';
+    }
+
+    this.client = new NetcatClient();
+    this.client.unixSocket(ipcPath)
+      .enc('utf8')
+      .connect()
+      .on('data', function(res){
+        if (self.callback) {
+          self.callback(null, res);
+          self.callback = null;
+        }
+      });
+
+    if (this.config.mine_normally) {
+      return this.sendCommand(minerStart);
+    }
+
+    self.sendCommand(minerStop, () => {
+      self.fundAccount(function () {
+        if (this.config.mine_periodically) self.start_periodic_mining();
+        if (this.config.mine_pending_txns) self.start_transaction_mining();
+      });
+    });
+
+  }
+
+  sendCommand(method, callback) {
+    if (callback) {
+      this.callback = callback;
+    }
+    this.client.send(JSON.stringify({"jsonrpc": "2.0", "method": method, "params": [], "id": 1}));
+  }
+
+  fundAccount(cb) {
+    const self = this;
+    const accountFunded = function () {
+      // TODO check https://github.com/ethereum/wiki/wiki/JSON-RPC for APIs
+      return (eth.getBalance(eth.coinbase) >= self.config.initial_ether);
+    };
+
+    if (accountFunded()) {
+      return cb();
+    }
+
+    console.log("== Funding account");
+    this.sendCommand(minerStart);
+
+    const blockWatcher = web3.eth.filter("latest").watch(function () {
+      if (accountFunded()) {
+        console.log("== Account funded");
+
+        blockWatcher.stopWatching();
+        self.sendCommand(minerStop, cb);
+      }
+    });
+  }
+
+  pendingTransactions() {
+    if (web3.eth.pendingTransactions === undefined || web3.eth.pendingTransactions === null) {
+      return txpool.status.pending || txpool.status.queued;
+    }
+    else if (typeof web3.eth.pendingTransactions === "function") {
+      return web3.eth.pendingTransactions().length > 0;
+    }
+    else {
+      return web3.eth.pendingTransactions.length > 0 || web3.eth.getBlock('pending').transactions.length > 0;
+    }
+  }
+
+  start_periodic_mining() {
+    const self = this;
+    let last_mined_ms = Date.now();
+    let timeout_set = false;
+
+    self.sendCommand(minerStart);
+    web3.eth.filter("latest").watch(function () {
+      if ((self.config.mine_pending_txns && self.pendingTransactions()) || timeout_set) {
+        return;
+      }
+
+      timeout_set = true;
+
+      const now = Date.now();
+      const ms_since_block = now - last_mined_ms;
+      last_mined_ms = now;
+
+      let next_block_in_ms;
+
+      if (ms_since_block > self.config.interval_ms) {
+        next_block_in_ms = 0;
+      } else {
+        next_block_in_ms = (self.config.interval_ms - ms_since_block);
+      }
+
+      self.sendCommand(minerStop);
+      console.log("== Looking for next block in " + next_block_in_ms + "ms");
+
+      setTimeout(function () {
+        console.log("== Looking for next block");
+        timeout_set = false;
+        //miner_obj.start(config.threads);
+        self.sendCommand(minerStart);
+      }, next_block_in_ms);
+    });
+  }
+
+  start_transaction_mining() {
+    const self = this;
+    web3.eth.filter("pending").watch(function () {
+      self.sendCommand(getHashRate, (err, response) => {
+        if (response.result > 0) return;
+
+        console.log("== Pending transactions! Looking for next block...");
+        self.sendCommand(minerStart);
+      });
+    });
+
+    if (self.config.mine_periodically) return;
+
+    web3.eth.filter("latest").watch(function () {
+      if (!self.pendingTransactions()) {
+        console.log("== No transactions left. Stopping miner...");
+        self.sendCommand(minerStop);
+      }
+    });
+  }
+}
+
+module.exports = GethMiner;