Add wallet api function to vote for number of witnesses/delegates

libraries/wallet/include/graphene/wallet/wallet.hpp

@@ -936,6 +936,31 @@ class wallet_api
       signed_transaction set_voting_proxy(string account_to_modify,
                                           optional<string> voting_account,
                                           bool broadcast = false);
+      
+      /** Set your vote for the number of witnesses and delegates in the system.
+       *
+       * Each account can voice their opinion on how many delegates and how many 
+       * witnesses there should be in the active delegate/active witness list.  These
+       * are independent of each other.  You must vote your approval of at least as many
+       * delegates or witnesses as you claim there should be (you can't say that there should
+       * be 20 delegates but only vote for 10). 
+       *
+       * There are maximum values for each set in the blockchain parameters (currently 
+       * defaulting to 1001).
+       *
+       * This setting can be changed at any time.  If your account has a voting proxy
+       * set, your preferences will be ignored.
+       *
+       * @param account_to_modify the name or id of the account to update
+       * @param number_of_delegates the number 
+       *
+       * @param broadcast true if you wish to broadcast the transaction
+       * @return the signed transaction changing your vote proxy settings
+       */
+      signed_transaction set_desired_witness_and_delegate_count(string account_to_modify,
+                                                                uint16_t desired_number_of_witnesses,
+                                                                uint16_t desired_number_of_delegates,
+                                                                bool broadcast = false);
 
       /** Signs a transaction.
        *
@@ -1042,6 +1067,7 @@ FC_API( graphene::wallet::wallet_api,
         (vote_for_delegate)
         (vote_for_witness)
         (set_voting_proxy)
+        (set_desired_witness_and_delegate_count)
         (get_account)
         (get_account_id)
         (get_block)

libraries/wallet/wallet.cpp

@@ -1328,6 +1328,32 @@ public:
       return sign_transaction( tx, broadcast );
    } FC_CAPTURE_AND_RETHROW( (account_to_modify)(voting_account)(broadcast) ) }
 
+   signed_transaction set_desired_witness_and_delegate_count(string account_to_modify,
+                                                             uint16_t desired_number_of_witnesses,
+                                                             uint16_t desired_number_of_delegates,
+                                                             bool broadcast /* = false */)
+   { try {
+      account_object account_object_to_modify = get_account(account_to_modify);
+
+      if (account_object_to_modify.options.num_witness == desired_number_of_witnesses &&
+          account_object_to_modify.options.num_committee == desired_number_of_delegates)
+         FC_THROW("Account ${account} is already voting for ${witnesses} witnesses and ${delegates} delegates", 
+                  ("account", account_to_modify)("witnesses", desired_number_of_witnesses)("delegates",desired_number_of_witnesses));
+      account_object_to_modify.options.num_witness = desired_number_of_witnesses;
+      account_object_to_modify.options.num_committee = desired_number_of_delegates;
+
+      account_update_operation account_update_op;
+      account_update_op.account = account_object_to_modify.id;
+      account_update_op.new_options = account_object_to_modify.options;
+
+      signed_transaction tx;
+      tx.operations.push_back( account_update_op );
+      tx.visit( operation_set_fee( _remote_db->get_global_properties().parameters.current_fees ) );
+      tx.validate();
+
+      return sign_transaction( tx, broadcast );
+   } FC_CAPTURE_AND_RETHROW( (account_to_modify)(desired_number_of_witnesses)(desired_number_of_delegates)(broadcast) ) }
+
    signed_transaction sign_transaction(signed_transaction tx, bool broadcast = false)
    {
       flat_set<account_id_type> req_active_approvals;
@@ -2074,6 +2100,15 @@ signed_transaction wallet_api::set_voting_proxy(string account_to_modify,
    return my->set_voting_proxy(account_to_modify, voting_account, broadcast);
 }
 
+signed_transaction wallet_api::set_desired_witness_and_delegate_count(string account_to_modify,
+                                                                      uint16_t desired_number_of_witnesses,
+                                                                      uint16_t desired_number_of_delegates,
+                                                                      bool broadcast /* = false */)
+{
+   return my->set_desired_witness_and_delegate_count(account_to_modify, desired_number_of_witnesses, 
+                                                     desired_number_of_delegates, broadcast);
+}
+
 void wallet_api::set_wallet_filename(string wallet_filename)
 {
    my->_wallet_filename = wallet_filename;