New cmd: query ibc-transfer escrow-address (#198)

* New cmd: query ibc-transfer escrow-address

* Update modules/apps/transfer/client/cli/query.go

* fix build, add changelog

Co-authored-by: Aditya <adityasripal@gmail.com>
Co-authored-by: Colin Axnér <25233464+colin-axner@users.noreply.github.com>

CHANGELOG.md

@@ -77,6 +77,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (modules/light-clients/07-tendermint) [\#125](https://github.com/cosmos/ibc-go/pull/125) Implement efficient iteration of consensus states and pruning of earliest expired consensus state on UpdateClient.
 * (modules/light-clients/07-tendermint) [\#141](https://github.com/cosmos/ibc-go/pull/141) Return early in case there's a duplicate update call to save Gas.
 
+### Features
+
+* [\#198](https://github.com/cosmos/ibc-go/pull/198) New CLI command `query ibc-transfer escrow-address <port> <channel id>` to get the escrow address for a channel; can be used to then query balance of escrowed tokens
+
 ### Client Breaking Changes
 
 * (02-client/cli) [\#196](https://github.com/cosmos/ibc-go/pull/196) Rename `node-state` cli command to `self-consensus-state`.

modules/apps/transfer/client/cli/cli.go

@@ -19,6 +19,7 @@ func GetQueryCmd() *cobra.Command {
 		GetCmdQueryDenomTrace(),
 		GetCmdQueryDenomTraces(),
 		GetCmdParams(),
+		GetCmdQueryEscrowAddress(),
 	)
 
 	return queryCmd

modules/apps/transfer/client/cli/query.go

@@ -106,3 +106,28 @@ func GetCmdParams() *cobra.Command {
 
 	return cmd
 }
+
+// GetCmdParams returns the command handler for ibc-transfer parameter querying.
+func GetCmdQueryEscrowAddress() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:     "escrow-address",
+		Short:   "Get the escrow address for a channel",
+		Long:    "Get the escrow address for a channel",
+		Args:    cobra.ExactArgs(2),
+		Example: fmt.Sprintf("%s query ibc-transfer escrow-address [port] [channel-id]", version.AppName),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+			port := args[0]
+			channel := args[1]
+			addr := types.GetEscrowAddress(port, channel)
+			return clientCtx.PrintString(fmt.Sprintf("%s\n", addr.String()))
+		},
+	}
+
+	flags.AddQueryFlagsToCmd(cmd)
+
+	return cmd
+}