Removed help message spam on startup.

Adds two methods to database package that adds server IDs to joined
server set and checks if those IDs exist in the set.

Adds server joined logic to joinHandler. Adds dependency on the bot
object in joinHandler.

internal/database/database.go

@@ -9,6 +9,8 @@ import (
 	"github.com/go-redis/redis/v7"
 )
 
+const joinedServerKey = "servers"
+
 // Database type acts as the control interface for the Redis datastore.
 type Database struct {
 	uri    string
@@ -42,7 +44,7 @@ func New(uri string) Database {
 
 // GetBestCandidateWord returns the best replacement synonym for supplied word.
 // The return order should be in the defined lexeme order in Lexeme.go.
-func (d Database) GetBestCandidateWord(word string) string {
+func (d *Database) GetBestCandidateWord(word string) string {
 	results := make([]*redis.StringCmd, 4)
 
 	_, err := d.client.TxPipelined(func(pipe redis.Pipeliner) error {
@@ -73,7 +75,7 @@ func (d Database) GetBestCandidateWord(word string) string {
 }
 
 // WaitForReady waits for `ready` status message in `status` pubsub channel.
-func (d Database) WaitForReady(timeout int) error {
+func (d *Database) WaitForReady(timeout int) error {
 	if timeout == 0 {
 		log.Println("Skipping database check...")
 		return nil
@@ -96,3 +98,20 @@ func (d Database) WaitForReady(timeout int) error {
 		}
 	}
 }
+
+// AddJoinedServer adds a server to the `servers` set.
+func (d *Database) AddJoinedServer(id string) error {
+	result := d.client.SAdd(joinedServerKey, id)
+	return result.Err()
+}
+
+// IsServerJoined checks if a specific guild is in the `servers` set.
+func (d *Database) IsServerJoined(id string) (bool, error) {
+	result := d.client.SIsMember(joinedServerKey, id)
+
+	if result.Err() != nil {
+		return false, result.Err()
+	}
+
+	return true, nil
+}

internal/discord/discord.go

@@ -104,7 +104,7 @@ func Run(ctx *cli.Context, skip bool) error {
 	}
 
 	bot.serviceHandler.AddHandler(bot.commandHandler)
-	bot.serviceHandler.AddHandler(joinHandler)
+	bot.serviceHandler.AddHandler(bot.joinHandler)
 	bot.serviceHandler.AddHandler(func(s *discordgo.Session, e *discordgo.Ready) {
 		s.UpdateGameStatus(0, "Reading a Thesaurus")
 	})

internal/discord/handlers.go

@@ -115,17 +115,27 @@ func mentionParser(s *discordgo.Session, u *discordgo.User, channelID string) (s
 	}
 }
 
-func joinHandler(s *discordgo.Session, c *discordgo.GuildCreate) {
+func (b *bot) joinHandler(s *discordgo.Session, c *discordgo.GuildCreate) {
 	if c.Guild.Unavailable {
 		log.Printf("guild %s unavailable", c.Guild.Name)
 
 		return
 	}
 
+	joined, err := b.database.IsServerJoined(c.Guild.ID)
+	if err != nil {
+		log.Printf("Could not check if server was in joined set %s", err)
+	}
+
+	if joined {
+		return
+	}
+
 	for _, channel := range c.Guild.Channels {
 		if channel.Type == discordgo.ChannelTypeGuildText {
 			_, err := s.ChannelMessageSendEmbed(channel.ID, helpEmbed)
 			if err == nil {
+				b.database.AddJoinedServer(c.Guild.ID)
 				return // If channel delivery was successful, exit.
 			}
 		}