Enhancement: in REPL mode allow user to specify path to file for bytes field

README.md

@@ -262,6 +262,12 @@ data (TYPE_BYTES) => \u65e5\u672c\u8a9e
 }
 ```
 
+Or add the flag `--bytes-from-file` to read bytes from the provided relative path
+```
+> call UnaryBytes --bytes-from-file
+data (TYPE_BYTES) => ../relative/path/to/file
+```
+
 ### Client streaming RPC
 Client streaming RPC accepts some requests and then returns only one response.  
 Finish request inputting with <kbd>CTRL-D</kbd>

e2e/testdata/fixtures/teste2e_repl-call_--help.golden

@@ -1,6 +1,7 @@
 usage: call <method name>
 
 Options:
-      --dig-manually   prompt asks whether to dig down if it encountered to a message field
-      --enrich         enrich response output includes header, message, trailer and status
+      --bytes-from-file   interpret TYPE_BYTES input as a relative path to a file
+      --dig-manually      prompt asks whether to dig down if it encountered to a message field
+      --enrich            enrich response output includes header, message, trailer and status
 

fill/filler.go

@@ -18,14 +18,20 @@ type Filler interface {
 	Fill(v interface{}) error
 }
 
+// InteractiveFillerOpts
+// If DigManually is true, Fill asks whether to dig down if it encountered to a message field.
+// If BytesFromFile is true, Fill will read the contents of the file from the provided relative path
+type InteractiveFillerOpts struct {
+	DigManually, BytesFromFile bool
+}
+
 // Filler tries to correspond input text to a struct interactively.
 type InteractiveFiller interface {
 	// Fill receives a struct v and corresponds input that is have internally to the struct.
-	// If digManually is true, Fill asks whether to dig down if it encountered to a message field.
 	// Fill may return these errors:
 	//
 	//   - io.EOF: At the end of input.
 	//   - ErrCodecMismatch: If v isn't a supported type.
 	//
-	Fill(v interface{}, digManually bool) error
+	Fill(v interface{}, opts InteractiveFillerOpts) error
 }

fill/proto/interactive_filler.go

@@ -3,6 +3,7 @@ package proto
 import (
 	"fmt"
 	"io"
+	"io/ioutil"
 	"strings"
 
 	"github.com/golang/protobuf/protoc-gen-go/descriptor"
@@ -20,7 +21,8 @@ type InteractiveFiller struct {
 	prefixFormat string
 	state        promptInputterState
 
-	digManually bool
+	digManually   bool
+	bytesFromFile bool
 }
 
 // NewInteractiveFiller instantiates a new filler that fills each field interactively.
@@ -35,8 +37,9 @@ func NewInteractiveFiller(prompt prompt.Prompt, prefixFormat string) *Interactiv
 // Fill let you input each field interactively by using a prompt. v will be set field values inputted by a prompt.
 //
 // Note that Fill resets the previous state when it is called again.
-func (f *InteractiveFiller) Fill(v interface{}, digManually bool) error {
-	f.digManually = digManually
+func (f *InteractiveFiller) Fill(v interface{}, opts fill.InteractiveFillerOpts) error {
+	f.digManually = opts.DigManually
+	f.bytesFromFile = opts.BytesFromFile
 
 	msg, ok := v.(*dynamic.Message)
 	if !ok {
@@ -213,7 +216,7 @@ func (f *InteractiveFiller) inputField(dmsg *dynamic.Message, field *desc.FieldD
 		f.state.color.Next()
 	default: // Normal fields.
 		f.prompt.SetPrefix(f.makePrefix(field))
-		v, err := f.inputPrimitiveField(field)
+		v, err := f.inputPrimitiveField(field.GetType())
 		if err != nil {
 			return err
 		}
@@ -301,7 +304,7 @@ func (f *InteractiveFiller) inputRepeatedField(dmsg *dynamic.Message, field *des
 
 // inputPrimitiveField reads an input and converts it to a Go type.
 // If CTRL+d is entered, inputPrimitiveField returns io.EOF.
-func (f *InteractiveFiller) inputPrimitiveField(field *desc.FieldDescriptor) (interface{}, error) {
+func (f *InteractiveFiller) inputPrimitiveField(fieldType descriptor.FieldDescriptorProto_Type) (interface{}, error) {
 	in, err := f.prompt.Input()
 	if errors.Is(err, io.EOF) {
 		return "", io.EOF
@@ -310,7 +313,28 @@ func (f *InteractiveFiller) inputPrimitiveField(field *desc.FieldDescriptor) (in
 		return "", errors.Wrap(err, "failed to read user input")
 	}
 
-	return convertValue(in, descriptor.FieldDescriptorProto_Type(descriptor.FieldDescriptorProto_Type_value[field.GetType().String()]))
+	v, err := convertValue(in, fieldType)
+	if err != nil {
+		return nil, err
+	}
+
+	if fieldType == descriptor.FieldDescriptorProto_TYPE_BYTES {
+		return f.processBytesInput(v)
+	}
+
+	return v, err
+}
+
+func (f *InteractiveFiller) processBytesInput(v interface{}) (interface{}, error) {
+	if _, ok := v.([]byte); !ok {
+		return nil, errors.New("value is not of type bytes")
+	}
+
+	if f.bytesFromFile {
+		return readFileFromRelativePath(string(v.([]byte)))
+	}
+
+	return v, nil
 }
 
 func (f *InteractiveFiller) isSelectedOneOf(field *desc.FieldDescriptor) bool {
@@ -438,3 +462,10 @@ func makePrefix(s string, field *desc.FieldDescriptor, ancestor []string, ancest
 func isOneOfField(field *desc.FieldDescriptor) bool {
 	return field.GetOneOf() != nil
 }
+
+func readFileFromRelativePath(path string) ([]byte, error) {
+	if path == "" {
+		return nil, nil
+	}
+	return ioutil.ReadFile(path)
+}

fill/proto/interactive_filler_test.go

@@ -1,16 +1,72 @@
-package proto_test
+package proto
 
 import (
 	"testing"
 
+	"github.com/golang/protobuf/protoc-gen-go/descriptor"
 	"github.com/ktr0731/evans/fill"
-	"github.com/ktr0731/evans/fill/proto"
+	"github.com/ktr0731/evans/prompt"
 )
 
+type testPrompt struct {
+	prompt.Prompt
+
+	input string
+}
+
+func (t *testPrompt) Input() (string, error) {
+	return t.input, nil
+}
+
 func TestInteractiveProtoFiller(t *testing.T) {
-	f := proto.NewInteractiveFiller(nil, "")
-	err := f.Fill("invalid type", false)
+	f := NewInteractiveFiller(nil, "")
+	err := f.Fill("invalid type", fill.InteractiveFillerOpts{})
 	if err != fill.ErrCodecMismatch {
 		t.Errorf("must return fill.ErrCodecMismatch because the arg is invalid type, but got: %s", err)
 	}
+
+	tp := &testPrompt{
+		input: "../../go.mod",
+	}
+
+	f = NewInteractiveFiller(tp, "")
+	f.bytesFromFile = true
+
+	var v interface{}
+	v, err = f.inputPrimitiveField(descriptor.FieldDescriptorProto_TYPE_BYTES)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if _, ok := v.([]byte); !ok {
+		t.Errorf("value should be of type []byte")
+	}
+
+	fileContent, err := readFileFromRelativePath(tp.input)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if len(v.([]byte)) != len(fileContent) {
+		t.Error("contents should have the same length")
+	}
+
+	tp = &testPrompt{
+		input: "\\x6f\\x67\\x69\\x73\\x6f",
+	}
+
+	f = NewInteractiveFiller(tp, "")
+
+	v, err = f.inputPrimitiveField(descriptor.FieldDescriptorProto_TYPE_BYTES)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if _, ok := v.([]byte); !ok {
+		t.Errorf("value should be of type []byte")
+	}
+
+	if string(v.([]byte)) != "ogiso" {
+		t.Error("unequal content")
+	}
 }

repl/commands.go

@@ -155,14 +155,15 @@ func (c *showCommand) Run(w io.Writer, args []string) error {
 }
 
 type callCommand struct {
-	enrich, digManually bool
+	enrich, digManually, bytesFromFile bool
 }
 
 func (c *callCommand) FlagSet() (*pflag.FlagSet, bool) {
 	fs := pflag.NewFlagSet("call", pflag.ContinueOnError)
 	fs.Usage = func() {} // Disable help output when an error occurred.
 	fs.BoolVar(&c.enrich, "enrich", false, "enrich response output includes header, message, trailer and status")
 	fs.BoolVar(&c.digManually, "dig-manually", false, "prompt asks whether to dig down if it encountered to a message field")
+	fs.BoolVar(&c.bytesFromFile, "bytes-from-file", false, "interpret TYPE_BYTES input as a relative path to a file")
 	return fs, true
 }
 
@@ -195,7 +196,9 @@ func (c *callCommand) Run(w io.Writer, args []string) error {
 		},
 	)
 
-	err := usecase.CallRPCInteractively(context.Background(), w, args[0], c.digManually)
+	// here we create the request context
+	// we also add the call command flags here
+	err := usecase.CallRPCInteractively(context.Background(), w, args[0], c.digManually, c.bytesFromFile)
 	if errors.Is(err, io.EOF) {
 		return errors.New("inputting canceled")
 	}

usecase/call_rpc.go

@@ -383,14 +383,14 @@ func (f *interactiveFiller) Fill(v interface{}) error {
 	return f.fillFunc(v)
 }
 
-func CallRPCInteractively(ctx context.Context, w io.Writer, rpcName string, digManually bool) error {
-	return dm.CallRPCInteractively(ctx, w, rpcName, digManually)
+func CallRPCInteractively(ctx context.Context, w io.Writer, rpcName string, digManually, bytesFromFile bool) error {
+	return dm.CallRPCInteractively(ctx, w, rpcName, digManually, bytesFromFile)
 }
 
-func (m *dependencyManager) CallRPCInteractively(ctx context.Context, w io.Writer, rpcName string, digManually bool) error {
+func (m *dependencyManager) CallRPCInteractively(ctx context.Context, w io.Writer, rpcName string, digManually, bytesFromFile bool) error {
 	return m.CallRPC(ctx, w, rpcName, &interactiveFiller{
 		fillFunc: func(v interface{}) error {
-			return m.interactiveFiller.Fill(v, digManually)
+			return m.interactiveFiller.Fill(v, fill.InteractiveFillerOpts{DigManually: digManually, BytesFromFile: bytesFromFile})
 		},
 	})
 }