Merge PR #1773: Query the votes on a proposal

* added lcd endpoint to query all votes on a proposal
* added cli support
* Gopkg.lock from new dep
* Update PENDING.md

x/gov/client/cli/tx.go

@@ -239,3 +239,54 @@ func GetCmdQueryVote(storeName string, cdc *wire.Codec) *cobra.Command {
 
 	return cmd
 }
+
+// Command to Get a Proposal Information
+func GetCmdQueryVotes(storeName string, cdc *wire.Codec) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "query-votes",
+		Short: "query votes on a proposal",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			proposalID := viper.GetInt64(flagProposalID)
+
+			ctx := context.NewCoreContextFromViper()
+
+			res, err := ctx.QueryStore(gov.KeyProposal(proposalID), storeName)
+			if len(res) == 0 || err != nil {
+				return errors.Errorf("proposalID [%d] does not exist", proposalID)
+			}
+
+			var proposal gov.Proposal
+			cdc.MustUnmarshalBinary(res, &proposal)
+
+			if proposal.GetStatus() != gov.StatusVotingPeriod {
+				fmt.Println("Proposal not in voting period.")
+				return nil
+			}
+
+			res2, err := ctx.QuerySubspace(cdc, gov.KeyVotesSubspace(proposalID), storeName)
+			if err != nil {
+				return err
+			}
+
+			var votes []gov.Vote
+			for i := 0; i < len(res2); i++ {
+				var vote gov.Vote
+				cdc.MustUnmarshalBinary(res2[i].Value, &vote)
+				votes = append(votes, vote)
+			}
+
+			output, err := wire.MarshalJSONIndent(cdc, votes)
+			if err != nil {
+				return err
+			}
+
+			fmt.Println(string(output))
+
+			return nil
+		},
+	}
+
+	cmd.Flags().String(flagProposalID, "", "proposalID of which proposal's votes are being queried")
+
+	return cmd
+}

x/gov/client/rest/rest.go

@@ -33,6 +33,8 @@ func RegisterRoutes(ctx context.CoreContext, r *mux.Router, cdc *wire.Codec) {
 	r.HandleFunc(fmt.Sprintf("/gov/proposals/{%s}/deposits/{%s}", RestProposalID, RestDepositer), queryDepositHandlerFn(cdc)).Methods("GET")
 	r.HandleFunc(fmt.Sprintf("/gov/proposals/{%s}/votes/{%s}", RestProposalID, RestVoter), queryVoteHandlerFn(cdc)).Methods("GET")
 
+	r.HandleFunc(fmt.Sprintf("/gov/proposals/{%s}/votes", RestProposalID), queryVotesOnProposalHandlerFn(cdc)).Methods("GET")
+
 	r.HandleFunc("/gov/proposals", queryProposalsWithParameterFn(cdc)).Methods("GET")
 }
 
@@ -335,6 +337,71 @@ func queryVoteHandlerFn(cdc *wire.Codec) http.HandlerFunc {
 	}
 }
 
+// nolint: gocyclo
+// todo: Split this functionality into helper functions to remove the above
+func queryVotesOnProposalHandlerFn(cdc *wire.Codec) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		vars := mux.Vars(r)
+		strProposalID := vars[RestProposalID]
+
+		if len(strProposalID) == 0 {
+			w.WriteHeader(http.StatusBadRequest)
+			err := errors.New("proposalId required but not specified")
+			w.Write([]byte(err.Error()))
+			return
+		}
+
+		proposalID, err := strconv.ParseInt(strProposalID, 10, 64)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			err := errors.Errorf("proposalID [%s] is not positive", proposalID)
+			w.Write([]byte(err.Error()))
+			return
+		}
+
+		ctx := context.NewCoreContextFromViper()
+
+		res, err := ctx.QueryStore(gov.KeyProposal(proposalID), storeName)
+		if err != nil || len(res) == 0 {
+			err := errors.Errorf("proposalID [%d] does not exist", proposalID)
+			w.Write([]byte(err.Error()))
+			return
+		}
+
+		var proposal gov.Proposal
+		cdc.MustUnmarshalBinary(res, &proposal)
+
+		if proposal.GetStatus() != gov.StatusVotingPeriod {
+			err := errors.Errorf("proposal is not in Voting Period", proposalID)
+			w.Write([]byte(err.Error()))
+			return
+		}
+
+		res2, err := ctx.QuerySubspace(cdc, gov.KeyVotesSubspace(proposalID), storeName)
+		if err != nil {
+			err = errors.New("ProposalID doesn't exist")
+			w.Write([]byte(err.Error()))
+			return
+		}
+
+		var votes []gov.Vote
+
+		for i := 0; i < len(res2); i++ {
+			var vote gov.Vote
+			cdc.MustUnmarshalBinary(res2[i].Value, &vote)
+			votes = append(votes, vote)
+		}
+
+		output, err := wire.MarshalJSONIndent(cdc, votes)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			w.Write([]byte(err.Error()))
+			return
+		}
+		w.Write(output)
+	}
+}
+
 // nolint: gocyclo
 // todo: Split this functionality into helper functions to remove the above
 func queryProposalsWithParameterFn(cdc *wire.Codec) http.HandlerFunc {