feat: add --grpc client option (#14051)

* feat: add --grpc client option

* updates

* default to TLS credentials

* add min version because of gosec lint

Co-authored-by: Marko <marbar3778@yahoo.com>
(cherry picked from commit 7d0a8dc)

client/cmd.go

@@ -1,13 +1,17 @@
 package client
 
 import (
+	"crypto/tls"
 	"fmt"
 	"strings"
 
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"github.com/tendermint/tendermint/libs/cli"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
 
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	"github.com/cosmos/cosmos-sdk/crypto/keyring"
@@ -147,6 +151,28 @@ func ReadPersistentCommandFlags(clientCtx Context, flagSet *pflag.FlagSet) (Cont
 		}
 	}
 
+	if clientCtx.GRPCClient == nil || flagSet.Changed(flags.FlagGRPC) {
+		grpcURI, _ := flagSet.GetString(flags.FlagGRPC)
+		if grpcURI != "" {
+			var dialOpts []grpc.DialOption
+
+			useInsecure, _ := flagSet.GetBool(flags.FlagGRPCInsecure)
+			if useInsecure {
+				dialOpts = append(dialOpts, grpc.WithTransportCredentials(insecure.NewCredentials()))
+			} else {
+				dialOpts = append(dialOpts, grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{
+					MinVersion: tls.VersionTLS12,
+				})))
+			}
+
+			grpcClient, err := grpc.Dial(grpcURI, dialOpts...)
+			if err != nil {
+				return Context{}, err
+			}
+			clientCtx = clientCtx.WithGRPCClient(grpcClient)
+		}
+	}
+
 	return clientCtx, nil
 }
 

client/flags/flags.go

@@ -46,6 +46,8 @@ const (
 	FlagUseLedger        = "ledger"
 	FlagChainID          = "chain-id"
 	FlagNode             = "node"
+	FlagGRPC             = "grpc"
+	FlagGRPCInsecure     = "grpc-insecure"
 	FlagHeight           = "height"
 	FlagGasAdjustment    = "gas-adjustment"
 	FlagFrom             = "from"
@@ -87,6 +89,8 @@ var LineBreak = &cobra.Command{Run: func(*cobra.Command, []string) {}}
 // AddQueryFlagsToCmd adds common flags to a module query command.
 func AddQueryFlagsToCmd(cmd *cobra.Command) {
 	cmd.Flags().String(FlagNode, "tcp://localhost:26657", "<host>:<port> to Tendermint RPC interface for this chain")
+	cmd.Flags().String(FlagGRPC, "", "the gRPC endpoint to use for this chain")
+	cmd.Flags().Bool(FlagGRPCInsecure, false, "allow gRPC over insecure channels, if not TLS the server must use TLS")
 	cmd.Flags().Int64(FlagHeight, 0, "Use a specific height to query state at (this can error if the node is pruning state)")
 	cmd.Flags().StringP(tmcli.OutputFlag, "o", "text", "Output format (text|json)")