server: implement messages and gRPC support for creating messages

server/api/api.go

@@ -35,6 +35,13 @@ func Start() {
 		r.Route("/{channelID}", func(r chi.Router) {
 			r.Get("/", GetChannel)
 			r.Delete("/", DeleteChannel)
+
+			r.Route("/messages", func(r chi.Router) {
+				r.Get("/", ListMessages)
+				r.Route("/{messageID}", func(r chi.Router) {
+					r.Get("/", GetMessage)
+				})
+			})
 		})
 	})
 

server/api/db.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"time"
 
 	"git.dubyatp.xyz/dubyatp/scannerbot/server/db"
 	"github.com/jackc/pgx/v5"
@@ -14,6 +15,7 @@ var ErrUserNotFound = errors.New("db: user not found")
 var ErrSessionNotFound = errors.New("db: session not found")
 var ErrChannelNotFound = errors.New("db: channel not found")
 var ErrFileNotFound = errors.New("db: file not found")
+var ErrMessageNotFound = errors.New("db: message not found")
 
 func dbGetUser(id string) (*User, error) {
 	query := `SELECT id, name, password FROM users WHERE id = $1`
@@ -233,3 +235,112 @@ func dbGetFile(id string) (*File, error) {
 	slog.Debug("db: file found", "fileid", file.ID, "filename", file.Name)
 	return &file, nil
 }
+
+func DBGetChannel(id string) (*Channel, error) { return dbGetChannel(id) }
+func DBAddFile(file *File) error               { return dbAddFile(file) }
+
+func DBAddMessage(msg *Message) error {
+	query := `INSERT INTO messages (id, channel, created, content, audio) VALUES ($1, $2, $3, $4, $5)`
+	_, err := db.Pool.Exec(context.Background(), query, msg.ID, msg.Channel.ID, msg.Created, msg.Content, msg.Audio.ID)
+	if err != nil {
+		slog.Error("db: failed to add message", "error", err, "messageid", msg.ID)
+		return fmt.Errorf("failed to add message")
+	}
+	slog.Debug("db: message added", "messageid", msg.ID)
+	return nil
+}
+
+func dbGetMessage(id string) (*Message, error) {
+	query := `SELECT id, channel, created, content, audio FROM messages WHERE id = $1`
+	var channelID, audioID string
+	var msg Message
+	err := db.Pool.QueryRow(context.Background(), query, id).Scan(&msg.ID, &channelID, &msg.Created, &msg.Content, &audioID)
+	if errors.Is(err, pgx.ErrNoRows) {
+		slog.Debug("db: message not found", "messageid", id)
+		return nil, ErrMessageNotFound
+	} else if err != nil {
+		slog.Error("db: failed to query message", "error", err)
+		return nil, fmt.Errorf("failed to query message")
+	}
+
+	channel, err := dbGetChannel(channelID)
+	if err != nil {
+		slog.Error("db: failed to fetch channel for message", "messageid", id, "channelid", channelID, "error", err)
+		return nil, fmt.Errorf("failed to fetch channel for message")
+	}
+	audio, err := dbGetFile(audioID)
+	if err != nil {
+		slog.Error("db: failed to fetch audio for message", "messageid", id, "audioid", audioID, "error", err)
+		return nil, fmt.Errorf("failed to fetch audio for message")
+	}
+
+	msg.Channel = *channel
+	msg.Audio = *audio
+	slog.Debug("db: message found", "messageid", msg.ID)
+	return &msg, nil
+}
+
+func dbGetMessagesByChannel(channelID string, from, to *time.Time) ([]*Message, error) {
+	query := `SELECT id, channel, created, content, audio FROM messages WHERE channel = $1`
+	args := []any{channelID}
+	if from != nil {
+		args = append(args, *from)
+		query += fmt.Sprintf(" AND created >= $%d", len(args))
+	}
+	if to != nil {
+		args = append(args, *to)
+		query += fmt.Sprintf(" AND created <= $%d", len(args))
+	}
+	query += " ORDER BY created DESC"
+	rows, err := db.Pool.Query(context.Background(), query, args...)
+	if err != nil {
+		slog.Error("db: failed to query messages", "error", err)
+		return nil, fmt.Errorf("failed to query messages")
+	}
+	defer rows.Close()
+
+	type messageRow struct {
+		msg       Message
+		channelID string
+		audioID   string
+	}
+
+	var rows_ []messageRow
+	for rows.Next() {
+		var mr messageRow
+		if err := rows.Scan(&mr.msg.ID, &mr.channelID, &mr.msg.Created, &mr.msg.Content, &mr.audioID); err != nil {
+			slog.Error("db: failed to scan message", "error", err)
+			return nil, fmt.Errorf("failed to scan message")
+		}
+		rows_ = append(rows_, mr)
+	}
+	if err := rows.Err(); err != nil {
+		slog.Error("db: row iteration error", "error", err)
+		return nil, fmt.Errorf("failed to iterate messages")
+	}
+	if len(rows_) == 0 {
+		slog.Debug("db: no messages found", "channelid", channelID)
+		return nil, ErrMessageNotFound
+	}
+
+	channel, err := dbGetChannel(channelID)
+	if err != nil {
+		slog.Error("db: failed to fetch channel for messages", "channelid", channelID, "error", err)
+		return nil, fmt.Errorf("failed to fetch channel for messages")
+	}
+
+	var messages []*Message
+	for _, mr := range rows_ {
+		audio, err := dbGetFile(mr.audioID)
+		if err != nil {
+			slog.Error("db: failed to fetch audio for message", "messageid", mr.msg.ID, "audioid", mr.audioID, "error", err)
+			return nil, fmt.Errorf("failed to fetch audio for message")
+		}
+		mr.msg.Channel = *channel
+		mr.msg.Audio = *audio
+		messages = append(messages, &mr.msg)
+	}
+
+	slog.Debug("db: message list returned", "channelid", channelID, "count", len(messages))
+	return messages, nil
+}

server/api/message.go

@@ -0,0 +1,99 @@
+package api
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/render"
+	"github.com/google/uuid"
+)
+
+type Message struct {
+	ID      uuid.UUID
+	Channel Channel
+	Created time.Time
+	Content string
+	Audio   File
+}
+
+type MessagePayload struct {
+	*Message
+}
+
+func GetMessage(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("message: entering GetMessage handler")
+
+	messageID := chi.URLParam(r, "messageID")
+	parsed, err := uuid.Parse(messageID)
+	if err != nil {
+		render.Render(w, r, ErrInvalidRequest(err))
+		return
+	}
+
+	msg, err := dbGetMessage(parsed.String())
+	if err != nil {
+		if errors.Is(err, ErrMessageNotFound) {
+			render.Render(w, r, ErrNotFound)
+		} else {
+			slog.Error("message: failed to fetch message", "messageid", parsed.String(), "error", err)
+			render.Render(w, r, ErrInternal(err))
+		}
+		return
+	}
+
+	slog.Debug("message: rendering message", "messageid", msg.ID)
+	if err := render.Render(w, r, NewMessagePayloadResponse(msg)); err != nil {
+		slog.Error("message: failed to render message", "messageid", parsed.String(), "error", err)
+		render.Render(w, r, ErrInternal(err))
+	}
+}
+
+func ListMessages(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("message: entering ListMessages handler")
+
+	channelID := chi.URLParam(r, "channelID")
+	parsed, err := uuid.Parse(channelID)
+	if err != nil {
+		render.Render(w, r, ErrInvalidRequest(err))
+		return
+	}
+
+	var from, to *time.Time
+	if v := r.URL.Query().Get("from"); v != "" {
+		t, err := time.Parse(time.RFC3339, v)
+		if err != nil {
+			render.Render(w, r, ErrInvalidRequest(fmt.Errorf("invalid 'from' timestamp: %w", err)))
+			return
+		}
+		from = &t
+	}
+	if v := r.URL.Query().Get("to"); v != "" {
+		t, err := time.Parse(time.RFC3339, v)
+		if err != nil {
+			render.Render(w, r, ErrInvalidRequest(fmt.Errorf("invalid 'to' timestamp: %w", err)))
+			return
+		}
+		to = &t
+	}
+
+	messages, err := dbGetMessagesByChannel(parsed.String(), from, to)
+	if err != nil {
+		if errors.Is(err, ErrMessageNotFound) {
+			render.Render(w, r, ErrNotFound)
+		} else {
+			slog.Error("message: failed to fetch messages", "channelid", parsed.String(), "error", err)
+			render.Render(w, r, ErrInternal(err))
+		}
+		return
+	}
+
+	slog.Debug("message: successfully fetched messages", "channelid", parsed.String(), "count", len(messages))
+	if err := render.RenderList(w, r, NewMessageListResponse(messages)); err != nil {
+		slog.Error("message: failed to render message list", "channelid", parsed.String(), "error", err)
+		render.Render(w, r, ErrInternal(err))
+	}
+}

server/api/response.go

@@ -49,3 +49,19 @@ func NewFilePayloadResponse(file *File) *FilePayload {
 func (f *FilePayload) Render(w http.ResponseWriter, r *http.Request) error {
 	return nil
 }
+
+func NewMessagePayloadResponse(msg *Message) *MessagePayload {
+	return &MessagePayload{Message: msg}
+}
+
+func NewMessageListResponse(messages []*Message) []render.Renderer {
+	list := []render.Renderer{}
+	for _, msg := range messages {
+		list = append(list, NewMessagePayloadResponse(msg))
+	}
+	return list
+}
+
+func (m *MessagePayload) Render(w http.ResponseWriter, r *http.Request) error {
+	return nil
+}

server/go.mod

@@ -17,6 +17,11 @@ require (
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	golang.org/x/net v0.53.0 // indirect
 	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.44.0 // indirect
 	golang.org/x/text v0.37.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 // indirect
+	google.golang.org/grpc v1.81.1 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 )

server/go.sum

@@ -30,10 +30,20 @@ github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 golang.org/x/crypto v0.51.0 h1:IBPXwPfKxY7cWQZ38ZCIRPI50YLeevDLlLnyC5wRGTI=
 golang.org/x/crypto v0.51.0/go.mod h1:8AdwkbraGNABw2kOX6YFPs3WM22XqI4EXEd8g+x7Oc8=
+golang.org/x/net v0.53.0 h1:d+qAbo5L0orcWAr0a9JweQpjXF19LMXJE8Ey7hwOdUA=
+golang.org/x/net v0.53.0/go.mod h1:JvMuJH7rrdiCfbeHoo3fCQU24Lf5JJwT9W3sJFulfgs=
 golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
 golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sys v0.44.0 h1:ildZl3J4uzeKP07r2F++Op7E9B29JRUy+a27EibtBTQ=
+golang.org/x/sys v0.44.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
 golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 h1:ggcbiqK8WWh6l1dnltU4BgWGIGo+EVYxCaAPih/zQXQ=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.81.1 h1:VnnIIZ88UzOOKLukQi+ImGz8O1Wdp8nAGGnvOfEIWQQ=
+google.golang.org/grpc v1.81.1/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

server/grpc/message.go

@@ -0,0 +1,72 @@
+package grpc
+
+import (
+	"bytes"
+	"context"
+	"log/slog"
+	"time"
+
+	"git.dubyatp.xyz/dubyatp/scannerbot/server/api"
+	pb "git.dubyatp.xyz/dubyatp/scannerbot/server/proto"
+	"github.com/google/uuid"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type MessageServer struct {
+	pb.UnimplementedMessageServiceServer
+}
+
+func (s *MessageServer) SendMessage(ctx context.Context, req *pb.SendMessageRequest) (*pb.SendMessageResponse, error) {
+	slog.Debug("grpc: entering SendMessage handler")
+
+	channelID, err := uuid.Parse(req.ChannelId)
+	if err != nil {
+		slog.Error("grpc: invalid channel_id", "error", err)
+		return nil, status.Errorf(codes.InvalidArgument, "invalid channel_id: %v", err)
+	}
+
+	channel, err := api.DBGetChannel(channelID.String())
+	if err != nil {
+		slog.Error("grpc: channel not found", "channelid", channelID, "error", err)
+		return nil, status.Errorf(codes.NotFound, "channel not found")
+	}
+
+	filename := req.AudioFilename
+	if filename == "" {
+		filename = channelID.String() + ".wav"
+	}
+
+	audio, err := api.Store.Save(filename, bytes.NewReader(req.Audio))
+	if err != nil {
+		slog.Error("grpc: failed to save audio file", "error", err)
+		return nil, status.Errorf(codes.Internal, "failed to save audio file")
+	}
+
+	if err := api.DBAddFile(audio); err != nil {
+		slog.Error("grpc: failed to persist audio file record", "error", err)
+		return nil, status.Errorf(codes.Internal, "failed to persist audio file")
+	}
+
+	msg := &api.Message{
+		ID:      uuid.New(),
+		Channel: *channel,
+		Created: time.Now(),
+		Content: req.Content,
+		Audio:   *audio,
+	}
+
+	if err := api.DBAddMessage(msg); err != nil {
+		slog.Error("grpc: failed to persist message", "error", err)
+		return nil, status.Errorf(codes.Internal, "failed to persist message")
+	}
+
+	slog.Debug("grpc: message saved", "messageid", msg.ID, "channelid", channelID)
+	return &pb.SendMessageResponse{
+		Id:        msg.ID.String(),
+		ChannelId: channel.ID.String(),
+		Created:   msg.Created.Format(time.RFC3339),
+		Content:   msg.Content,
+		AudioId:   audio.ID.String(),
+	}, nil
+}

server/grpc/server.go

@@ -0,0 +1,25 @@
+package grpc
+
+import (
+	"log/slog"
+	"net"
+
+	pb "git.dubyatp.xyz/dubyatp/scannerbot/server/proto"
+	"google.golang.org/grpc"
+)
+
+func Start() {
+	lis, err := net.Listen("tcp", ":3001")
+	if err != nil {
+		slog.Error("grpc: failed to listen", "error", err)
+		return
+	}
+
+	s := grpc.NewServer()
+	pb.RegisterMessageServiceServer(s, &MessageServer{})
+
+	slog.Info("Starting the gRPC server...", "addr", lis.Addr())
+	if err := s.Serve(lis); err != nil {
+		slog.Error("grpc: server failed", "error", err)
+	}
+}

server/main.go

@@ -5,6 +5,7 @@ import (
 	"os"
 
 	"git.dubyatp.xyz/dubyatp/scannerbot/server/api"
+	grpcserver "git.dubyatp.xyz/dubyatp/scannerbot/server/grpc"
 	"github.com/joho/godotenv"
 )
 
@@ -35,6 +36,8 @@ func main() {
 		os.Exit(1)
 	}
 
+	go grpcserver.Start()
+
 	slog.Info("Starting the API server...")
 	api.Start()
 }

server/proto/message.pb.go

@@ -0,0 +1,239 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.11
+// 	protoc        v3.21.12
+// source: proto/message.proto
+
+package proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type SendMessageRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	ChannelId     string                 `protobuf:"bytes,1,opt,name=channel_id,json=channelId,proto3" json:"channel_id,omitempty"`
+	Content       string                 `protobuf:"bytes,2,opt,name=content,proto3" json:"content,omitempty"`
+	AudioFilename string                 `protobuf:"bytes,3,opt,name=audio_filename,json=audioFilename,proto3" json:"audio_filename,omitempty"`
+	Audio         []byte                 `protobuf:"bytes,4,opt,name=audio,proto3" json:"audio,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *SendMessageRequest) Reset() {
+	*x = SendMessageRequest{}
+	mi := &file_proto_message_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *SendMessageRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SendMessageRequest) ProtoMessage() {}
+
+func (x *SendMessageRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_message_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SendMessageRequest.ProtoReflect.Descriptor instead.
+func (*SendMessageRequest) Descriptor() ([]byte, []int) {
+	return file_proto_message_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *SendMessageRequest) GetChannelId() string {
+	if x != nil {
+		return x.ChannelId
+	}
+	return ""
+}
+
+func (x *SendMessageRequest) GetContent() string {
+	if x != nil {
+		return x.Content
+	}
+	return ""
+}
+
+func (x *SendMessageRequest) GetAudioFilename() string {
+	if x != nil {
+		return x.AudioFilename
+	}
+	return ""
+}
+
+func (x *SendMessageRequest) GetAudio() []byte {
+	if x != nil {
+		return x.Audio
+	}
+	return nil
+}
+
+type SendMessageResponse struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	ChannelId     string                 `protobuf:"bytes,2,opt,name=channel_id,json=channelId,proto3" json:"channel_id,omitempty"`
+	Created       string                 `protobuf:"bytes,3,opt,name=created,proto3" json:"created,omitempty"`
+	Content       string                 `protobuf:"bytes,4,opt,name=content,proto3" json:"content,omitempty"`
+	AudioId       string                 `protobuf:"bytes,5,opt,name=audio_id,json=audioId,proto3" json:"audio_id,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *SendMessageResponse) Reset() {
+	*x = SendMessageResponse{}
+	mi := &file_proto_message_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *SendMessageResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SendMessageResponse) ProtoMessage() {}
+
+func (x *SendMessageResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_message_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SendMessageResponse.ProtoReflect.Descriptor instead.
+func (*SendMessageResponse) Descriptor() ([]byte, []int) {
+	return file_proto_message_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *SendMessageResponse) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *SendMessageResponse) GetChannelId() string {
+	if x != nil {
+		return x.ChannelId
+	}
+	return ""
+}
+
+func (x *SendMessageResponse) GetCreated() string {
+	if x != nil {
+		return x.Created
+	}
+	return ""
+}
+
+func (x *SendMessageResponse) GetContent() string {
+	if x != nil {
+		return x.Content
+	}
+	return ""
+}
+
+func (x *SendMessageResponse) GetAudioId() string {
+	if x != nil {
+		return x.AudioId
+	}
+	return ""
+}
+
+var File_proto_message_proto protoreflect.FileDescriptor
+
+const file_proto_message_proto_rawDesc = "" +
+	"\n" +
+	"\x13proto/message.proto\x12\n" +
+	"scannerbot\"\x8a\x01\n" +
+	"\x12SendMessageRequest\x12\x1d\n" +
+	"\n" +
+	"channel_id\x18\x01 \x01(\tR\tchannelId\x12\x18\n" +
+	"\acontent\x18\x02 \x01(\tR\acontent\x12%\n" +
+	"\x0eaudio_filename\x18\x03 \x01(\tR\raudioFilename\x12\x14\n" +
+	"\x05audio\x18\x04 \x01(\fR\x05audio\"\x93\x01\n" +
+	"\x13SendMessageResponse\x12\x0e\n" +
+	"\x02id\x18\x01 \x01(\tR\x02id\x12\x1d\n" +
+	"\n" +
+	"channel_id\x18\x02 \x01(\tR\tchannelId\x12\x18\n" +
+	"\acreated\x18\x03 \x01(\tR\acreated\x12\x18\n" +
+	"\acontent\x18\x04 \x01(\tR\acontent\x12\x19\n" +
+	"\baudio_id\x18\x05 \x01(\tR\aaudioId2`\n" +
+	"\x0eMessageService\x12N\n" +
+	"\vSendMessage\x12\x1e.scannerbot.SendMessageRequest\x1a\x1f.scannerbot.SendMessageResponseB1Z/git.dubyatp.xyz/dubyatp/scannerbot/server/protob\x06proto3"
+
+var (
+	file_proto_message_proto_rawDescOnce sync.Once
+	file_proto_message_proto_rawDescData []byte
+)
+
+func file_proto_message_proto_rawDescGZIP() []byte {
+	file_proto_message_proto_rawDescOnce.Do(func() {
+		file_proto_message_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_proto_message_proto_rawDesc), len(file_proto_message_proto_rawDesc)))
+	})
+	return file_proto_message_proto_rawDescData
+}
+
+var file_proto_message_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_proto_message_proto_goTypes = []any{
+	(*SendMessageRequest)(nil),  // 0: scannerbot.SendMessageRequest
+	(*SendMessageResponse)(nil), // 1: scannerbot.SendMessageResponse
+}
+var file_proto_message_proto_depIdxs = []int32{
+	0, // 0: scannerbot.MessageService.SendMessage:input_type -> scannerbot.SendMessageRequest
+	1, // 1: scannerbot.MessageService.SendMessage:output_type -> scannerbot.SendMessageResponse
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_proto_message_proto_init() }
+func file_proto_message_proto_init() {
+	if File_proto_message_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_proto_message_proto_rawDesc), len(file_proto_message_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_proto_message_proto_goTypes,
+		DependencyIndexes: file_proto_message_proto_depIdxs,
+		MessageInfos:      file_proto_message_proto_msgTypes,
+	}.Build()
+	File_proto_message_proto = out.File
+	file_proto_message_proto_goTypes = nil
+	file_proto_message_proto_depIdxs = nil
+}

server/proto/message.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package scannerbot;
+
+option go_package = "git.dubyatp.xyz/dubyatp/scannerbot/server/proto";
+
+service MessageService {
+  rpc SendMessage(SendMessageRequest) returns (SendMessageResponse);
+}
+
+message SendMessageRequest {
+  string channel_id = 1;
+  string content = 2;
+  string audio_filename = 3;
+  bytes audio = 4;
+}
+
+message SendMessageResponse {
+  string id = 1;
+  string channel_id = 2;
+  string created = 3;
+  string content = 4;
+  string audio_id = 5;
+}

server/proto/message_grpc.pb.go

@@ -0,0 +1,121 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.6.2
+// - protoc             v3.21.12
+// source: proto/message.proto
+
+package proto
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	MessageService_SendMessage_FullMethodName = "/scannerbot.MessageService/SendMessage"
+)
+
+// MessageServiceClient is the client API for MessageService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type MessageServiceClient interface {
+	SendMessage(ctx context.Context, in *SendMessageRequest, opts ...grpc.CallOption) (*SendMessageResponse, error)
+}
+
+type messageServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewMessageServiceClient(cc grpc.ClientConnInterface) MessageServiceClient {
+	return &messageServiceClient{cc}
+}
+
+func (c *messageServiceClient) SendMessage(ctx context.Context, in *SendMessageRequest, opts ...grpc.CallOption) (*SendMessageResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(SendMessageResponse)
+	err := c.cc.Invoke(ctx, MessageService_SendMessage_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// MessageServiceServer is the server API for MessageService service.
+// All implementations must embed UnimplementedMessageServiceServer
+// for forward compatibility.
+type MessageServiceServer interface {
+	SendMessage(context.Context, *SendMessageRequest) (*SendMessageResponse, error)
+	mustEmbedUnimplementedMessageServiceServer()
+}
+
+// UnimplementedMessageServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedMessageServiceServer struct{}
+
+func (UnimplementedMessageServiceServer) SendMessage(context.Context, *SendMessageRequest) (*SendMessageResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "method SendMessage not implemented")
+}
+func (UnimplementedMessageServiceServer) mustEmbedUnimplementedMessageServiceServer() {}
+func (UnimplementedMessageServiceServer) testEmbeddedByValue()                        {}
+
+// UnsafeMessageServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to MessageServiceServer will
+// result in compilation errors.
+type UnsafeMessageServiceServer interface {
+	mustEmbedUnimplementedMessageServiceServer()
+}
+
+func RegisterMessageServiceServer(s grpc.ServiceRegistrar, srv MessageServiceServer) {
+	// If the following call panics, it indicates UnimplementedMessageServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&MessageService_ServiceDesc, srv)
+}
+
+func _MessageService_SendMessage_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SendMessageRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(MessageServiceServer).SendMessage(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: MessageService_SendMessage_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(MessageServiceServer).SendMessage(ctx, req.(*SendMessageRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// MessageService_ServiceDesc is the grpc.ServiceDesc for MessageService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var MessageService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "scannerbot.MessageService",
+	HandlerType: (*MessageServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "SendMessage",
+			Handler:    _MessageService_SendMessage_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "proto/message.proto",
+}