Fix/get all reacted users

app/internal/domain/repository/slack.go

@@ -24,8 +24,15 @@ import (
 )
 
 type SlackRepository interface {
+	// PostMessage send a message to a channel
 	PostMessage(ctx context.Context, channelID, message, ts string) error
+
+	// PostEphemeral sends an ephemeral message to user in a channel
 	PostEphemeral(ctx context.Context, channelID, message, ts, userID string) error
+
+	// GetParentMessage gets Slack message that started the thread
 	GetParentMessage(ctx context.Context, channelID, ts string) (*model.SlackMessage, error)
+
+	// ListUsersEmail fetches users email
 	ListUsersEmail(ctx context.Context, userID []string) ([]*model.SlackUserEmail, error)
 }

app/internal/domain/service/slack_reaction_users.go

@@ -68,18 +68,19 @@ func (s *slackReactionUsersService) ListUsersEmailByReaction(ctx context.Context
 	if err != nil {
 		return nil, err
 	}
-	inviteUserIDs := s.getReactionUserIDs(ctx, msg.Reactions, reactionName)
-	inviteUserEmails, err := s.chunkedListUsersEmail(ctx, inviteUserIDs)
+	reactedUserIDs := s.getReactionUserIDs(ctx, msg.Reactions, reactionName)
+	reactedUserEmails, err := s.chunkedListUsersEmail(ctx, reactedUserIDs)
 	if err != nil {
 		return nil, err
 	}
-	return inviteUserEmails, nil
+	return reactedUserEmails, nil
 }
 
 // getReactionUserIDs get reaction users by reactionName
 func (s *slackReactionUsersService) getReactionUserIDs(ctx context.Context, reactions []*model.SlackReaction, reactionName string) []string {
 	var userIDs []string
 	var targetReactions []*model.SlackReaction
+	// filtered reactions by reactionName
 	for _, reaction := range reactions {
 		rn := slack.ExtractReactionName(reaction.Name)
 		if slack.RemoveSkinToneFromReaction(rn) == reactionName {

app/internal/domain/service/slack_reaction_users_test.go

@@ -41,10 +41,12 @@ func Test_slackReactionUsersService_ListUsersEmailByReaction(t *testing.T) {
 			{
 				Name:    "join",
 				UserIDs: []string{"user01", "user02"},
+				Count:   2,
 			},
 			{
 				Name:    "reactionSample",
 				UserIDs: []string{"user02", "user03"},
+				Count:   2,
 			},
 		},
 	}

app/internal/model/slack_message.go

@@ -23,6 +23,7 @@ type SlackMessage struct {
 
 type SlackReaction struct {
 	Name    string
+	Count   int
 	UserIDs []string
 }
 

app/internal/repository/slack.go

@@ -18,7 +18,8 @@ package repository
 
 import (
 	"context"
-	"fmt"
+
+	slack2 "github.com/slack-go/slack"
 
 	"github.com/moneyforward/auriga/app/pkg/slack"
 
@@ -55,23 +56,40 @@ func (r *slackRepository) GetParentMessage(ctx context.Context, channelID, ts st
 			return nil, err
 		}
 	}
+	if len(msgs) <= 0 {
+		return nil, errors.New("number of messages is zero")
+	}
+	parentMessage := msgs[0]
+	var reactions []*model.SlackReaction
+	if r.isIncompleteReaction(parentMessage.Reactions) {
+		// get full reactions
+		parentMessage.Reactions, err = r.client.GetReaction(ctx, channelID, ts, true)
+		if err != nil {
+			return nil, err
+		}
+	}
+	for _, reaction := range parentMessage.Reactions {
+		reactions = append(reactions, &model.SlackReaction{
+			Name:    reaction.Name,
+			UserIDs: reaction.Users,
+			Count:   reaction.Count,
+		})
+	}
+	return &model.SlackMessage{
+		ChannelID: parentMessage.Channel,
+		Reactions: reactions,
+	}, nil
+}
 
-	if len(msgs) > 0 {
-		fmt.Printf("%#v \n", msgs[0])
-		parentMessage := msgs[0]
-		var reactions []*model.SlackReaction
-		for _, reaction := range parentMessage.Reactions {
-			reactions = append(reactions, &model.SlackReaction{
-				Name:    reaction.Name,
-				UserIDs: reaction.Users,
-			})
+// isIncompleteReaction returns true if more fetches is required
+// reactions[*].Count may be greater than len(reactions[*].Users), at which point a fetch is required.
+func (r *slackRepository) isIncompleteReaction(reactions []slack2.ItemReaction) bool {
+	for _, reaction := range reactions {
+		if reaction.Count > len(reaction.Users) {
+			return true
 		}
-		return &model.SlackMessage{
-			ChannelID: parentMessage.Channel,
-			Reactions: reactions,
-		}, nil
 	}
-	return nil, errors.New("number of messages is zero")
+	return false
 }
 
 func (r *slackRepository) ListUsersEmail(ctx context.Context, userID []string) ([]*model.SlackUserEmail, error) {

app/pkg/slack/client.go

@@ -28,6 +28,7 @@ type Client interface {
 	PostEphemeral(ctx context.Context, channelID, userID, ts, message string) error
 	GetConversationReplies(ctx context.Context, channelID, ts string) ([]slack.Message, error)
 	GetUsersInfo(ctx context.Context, userID ...string) (*[]slack.User, error)
+	GetReaction(ctx context.Context, channelID, ts string, full bool) ([]slack.ItemReaction, error)
 
 	GetClient() *slack.Client
 	GetAppUserID() string
@@ -118,6 +119,15 @@ func (c *client) GetUsersInfo(ctx context.Context, userID ...string) (*[]slack.U
 	return users, nil
 }
 
+func (c *client) GetReaction(ctx context.Context, channelID, ts string, full bool) ([]slack.ItemReaction, error) {
+	return c.Client.GetReactionsContext(ctx, slack.ItemRef{
+		Channel:   channelID,
+		Timestamp: ts,
+	}, slack.GetReactionsParameters{
+		Full: full,
+	})
+}
+
 func (c *client) GetClient() *slack.Client {
 	return c.Client
 }