feat(autocli): add json file parsing support

CHANGELOG.md

@@ -60,6 +60,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/groups) [#14879](https://github.com/cosmos/cosmos-sdk/pull/14879) Add `Query/Groups` query to get all the groups.
 * (x/genutil,cli) [#15147](https://github.com/cosmos/cosmos-sdk/pull/15147) Add `--initial-height` flag to cli init cmd to provide `genesis.json` with user defined initial block height
 * (x/gov) [#15151](https://github.com/cosmos/cosmos-sdk/pull/15151) Add `burn_vote_quorum`, `burn_proposal_deposit_prevote` and `burn_vote_veto` params to allow applications to decide if they would like to burn deposits
+* (client/autocli) [#15451](https://github.com/cosmos/cosmos-sdk/pull/15451) Add support to reading a json file to AutoCli generated commands.
+
 
 ### Improvements
 

client/v2/autocli/flag/message_json.go

@@ -3,6 +3,9 @@ package flag
 import (
 	"context"
 	"fmt"
+	"io"
+	"os"
+	"regexp"
 
 	"google.golang.org/protobuf/encoding/protojson"
 	"google.golang.org/protobuf/proto"
@@ -11,6 +14,8 @@ import (
 	"cosmossdk.io/client/v2/internal/util"
 )
 
+var isJsonFileRegex = regexp.MustCompile(`\.json$`)
+
 type jsonMessageFlagType struct {
 	messageDesc protoreflect.MessageDescriptor
 }
@@ -55,7 +60,20 @@ func (j *jsonMessageFlagValue) String() string {
 
 func (j *jsonMessageFlagValue) Set(s string) error {
 	j.message = j.messageType.New().Interface()
-	return j.jsonUnmarshalOptions.Unmarshal([]byte(s), j.message)
+	var messageBytes []byte
+	if isJsonFileRegex.MatchString(s) {
+		jsonFile, err := os.Open(s)
+		if err != nil {
+			return err
+		}
+		messageBytes, err = io.ReadAll(jsonFile)
+		if err != nil {
+			return err
+		}
+	} else {
+		messageBytes = []byte(s)
+	}
+	return j.jsonUnmarshalOptions.Unmarshal(messageBytes, j.message)
 }
 
 func (j *jsonMessageFlagValue) Type() string {

client/v2/autocli/query_test.go

@@ -144,6 +144,26 @@ func TestEverything(t *testing.T) {
 	assert.DeepEqual(t, conn.lastRequest, conn.lastResponse.(*testpb.EchoResponse).Request, protocmp.Transform())
 }
 
+func TestJsonFlag(t *testing.T) {
+	conn := testExecCommon(t, buildModuleQueryCommand,
+		"echo",
+		"1", "abc", `{"denom":"foo","amount":"1"}`,
+		"--some-messages", `{"bar":"baz"}`,
+		"-u", "27", // shorthand
+	)
+	lastReq := conn.lastRequest.(*testpb.EchoRequest)
+	assert.Equal(t, uint32(27), lastReq.U32)
+
+	conn = testExecCommon(t, buildModuleQueryCommand,
+		"echo",
+		"1", "abc", `{"denom":"foo","amount":"1"}`,
+		"--some-messages", "testdata/some_message.json",
+		"-u", "27", // shorthand
+	)
+	lastReq = conn.lastRequest.(*testpb.EchoRequest)
+	assert.Equal(t, uint32(27), lastReq.U32)
+}
+
 func TestOptions(t *testing.T) {
 	conn := testExecCommon(t, buildModuleQueryCommand,
 		"echo",

client/v2/autocli/testdata/some_message.json

@@ -0,0 +1 @@
+{"bar":"baz"}