RPCs for mode change (#3002)

* Allow warnings.

* Add RPCs to allow ad-hoc mode changes.

* Add the JSAPI interfaces

* Add missing file.

js/src/api/rpc/ethcore/ethcore.js

@@ -91,6 +91,11 @@ export default class Ethcore {
       .then(outNumber);
   }
 
+  mode () {
+    return this._transport
+      .execute('ethcore_mode');
+  }
+
   netChain () {
     return this._transport
       .execute('ethcore_netChain');
@@ -161,6 +166,11 @@ export default class Ethcore {
       .execute('ethcore_setMinGasPrice', inNumber16(quantity));
   }
 
+  setMode (mode) {
+    return this._transport
+      .execute('ethcore_setMode', mode);
+  }
+
   setTransactionsLimit (quantity) {
     return this._transport
       .execute('ethcore_setTransactionsLimit', inNumber16(quantity));

js/src/jsonrpc/interfaces/ethcore.js

@@ -156,6 +156,15 @@ export default {
     }
   },
 
+  mode: {
+    desc: 'Get the mode. Results one of: "active", "passive", "dark", "off".',
+    params: [],
+    returns: {
+      type: String,
+      desc: 'The mode'
+    }
+  },
+
   netChain: {
     desc: 'Returns the name of the connected chain.',
     params: [],
@@ -307,6 +316,20 @@ export default {
     }
   },
 
+  setMode: {
+    desc: 'Changes the mode',
+    params: [
+      {
+        type: String,
+        desc: 'The mode to set, one of "active", "passive", "dark", "off"'
+      }
+    ],
+    returns: {
+      type: Boolean,
+      desc: 'True if the call succeeded'
+    }
+  },
+
   setTransactionsLimit: {
     desc: 'Changes limit for transactions in queue.',
     params: [