feat: Add support for automatically updating users

- Although there is a `user_updated` event we can bind to, it fires
  whenever a user updates their status, which might be overkill.
  Instead, we'll automatically update users every four hours.

reactionbot/messages.go

@@ -86,9 +86,9 @@ func getReactionItem(reactionEvent *slackevents.ReactionAddedEvent) slackevents.
 // PostReactedMessageToChannel is the function used to post a reaction
 func (bot ReactionBot) PostReactedMessageToChannel(reactionEvent *slackevents.ReactionAddedEvent) (channelID string, timetamp string, error error) {
 	allUsers := bot.Users
-	reactedByUser := GetUserByUserID(allUsers, reactionEvent.User)
+	reactedByUser := GetUserByUserID(*allUsers, reactionEvent.User)
 	reactedByName := reactedByUser.DisplayName
-	reactedToUser := GetUserByUserID(allUsers, reactionEvent.ItemUser)
+	reactedToUser := GetUserByUserID(*allUsers, reactionEvent.ItemUser)
 	reactedToName := reactedToUser.Username
 
 	reactionEmoji := getReactionEmoji(reactionEvent)

reactionbot/reactionbot.go

@@ -3,16 +3,20 @@ package reactionbot
 import (
 	"log"
 	"os"
+	"time"
 
+	"github.com/fatih/color"
 	"github.com/slack-go/slack"
 )
 
+const refreshIntervalInHours = 4
+
 // ReactionBot is our main structure
 type ReactionBot struct {
 	Slack           *slack.Client
 	IsDevelopment   bool
 	RegisteredEmoji RegisteredReactions
-	Users           SlackUsers
+	Users           *SlackUsers
 }
 
 // RegistrationOptions the list of options to init the package
@@ -31,6 +35,17 @@ func getSlackInstance(options RegistrationOptions) *slack.Client {
 	)
 }
 
+func (bot *ReactionBot) setUpdateTicker() {
+	ticker := time.NewTicker(time.Hour * refreshIntervalInHours)
+	go func() {
+		for range ticker.C {
+			color.White("Updating users...")
+			slackUsers := GetSlackWorkspaceUsers(bot.Slack)
+			*bot.Users = *slackUsers
+		}
+	}()
+}
+
 func getReactionBot(options RegistrationOptions) ReactionBot {
 	slack := getSlackInstance(options)
 	slackUsers := GetSlackWorkspaceUsers(slack)
@@ -40,11 +55,13 @@ func getReactionBot(options RegistrationOptions) ReactionBot {
 		RegisteredEmoji: options.RegisteredEmoji,
 		Users:           slackUsers,
 	}
+
 	return bot
 }
 
 // New function to init the package
 func New(options RegistrationOptions) {
 	bot := getReactionBot(options)
-	RegisterSlackBot(bot)
+	go bot.setUpdateTicker()
+	bot.RegisterSlackBot()
 }

reactionbot/registration.go

@@ -10,7 +10,7 @@ import (
 )
 
 // RegisterSlackBot is the function used to start the bot and listen for reactions
-func RegisterSlackBot(bot ReactionBot) {
+func (bot ReactionBot) RegisterSlackBot() {
 
 	client := socketmode.New(bot.Slack)
 

reactionbot/users.go

@@ -30,7 +30,7 @@ func GetUserByUserID(users SlackUsers, userID string) SlackUser {
 
 // GetSlackWorkspaceUsers is a function to return all
 // users of the workspace
-func GetSlackWorkspaceUsers(slackInstance *slack.Client) SlackUsers {
+func GetSlackWorkspaceUsers(slackInstance *slack.Client) *SlackUsers {
 	users, err := slackInstance.GetUsers()
 	if err != nil {
 		fmt.Printf("%s\n", err)
@@ -50,5 +50,5 @@ func GetSlackWorkspaceUsers(slackInstance *slack.Client) SlackUsers {
 		}
 	}
 
-	return userDictionary
+	return &userDictionary
 }