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discobeat.go
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discobeat.go
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package beater
import (
"encoding/json"
"fmt"
"github.com/bwmarrin/discordgo"
"io/ioutil"
"os"
"time"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/fergloragain/discobeat/config"
)
const DBFile = "checkpoints.db"
// Discobeat configuration.
type Discobeat struct {
done chan struct{}
config config.Config
client beat.Client
discordUsers []*DiscordUser
running bool
}
type Beater interface {
getConfig() config.Config
publishNewEvent(guild *discordgo.UserGuild, channel *discordgo.Channel, message *discordgo.Message) error
}
type RealUserCreator struct {}
func (rc *RealUserCreator) NewFromToken(token string) (s *discordgo.Session, err error){
return discordgo.New("Bot " + token)
}
func (rc *RealUserCreator) NewFromUsernamePassword(username, password string) (s *discordgo.Session, err error) {
return discordgo.New(username, password)
}
// New creates an instance of discobeat.
func New(b *beat.Beat, cfg *common.Config) (beat.Beater, error) {
config := config.DefaultConfig
if err := cfg.Unpack(&config); err != nil {
return nil, fmt.Errorf("Error reading config file: %v", err)
}
persistedCheckpoints := openPersistence()
rc := new(RealUserCreator)
discordUsers, err := buildUsers(config, persistedCheckpoints, rc)
if err != nil {
return nil, err
}
bt := &Discobeat{
done: make(chan struct{}),
config: config,
discordUsers: discordUsers,
}
return bt, nil
}
// Run starts discobeat.
func (bt *Discobeat) Run(b *beat.Beat) error {
logp.Info("discobeat is running! Hit CTRL-C to stop it.")
var err error
bt.client, err = b.Publisher.Connect()
if err != nil {
return err
}
ticker := time.NewTicker(bt.config.Period)
for {
select {
case <-bt.done:
return nil
case <-ticker.C:
if !bt.running {
err = bt.readMessages()
if err != nil {
return err
}
}
}
}
}
func (bt *Discobeat) persistCheckpoints() {
checkpoints := map[string]map[string]map[string]string{}
for _, du := range bt.discordUsers {
key := fmt.Sprintf("token%suser%s_", du.token, du.user)
checkpoints[key] = du.checkpoints
}
rankingsJson, _ := json.Marshal(checkpoints)
err := ioutil.WriteFile(DBFile, rankingsJson, 0644)
if err != nil {
logp.Err(err.Error())
}
}
func openPersistence() map[string]map[string]map[string]string {
jsonFile, err := os.Open(DBFile)
if err != nil {
fmt.Println(err)
}
defer jsonFile.Close()
byteValue, _ := ioutil.ReadAll(jsonFile)
var persistedCheckpoints map[string]map[string]map[string]string
json.Unmarshal(byteValue, &persistedCheckpoints)
return persistedCheckpoints
}
// Stop stops discobeat.
func (bt *Discobeat) Stop() {
bt.persistCheckpoints()
bt.client.Close()
close(bt.done)
}
func (bt *Discobeat) readMessages() error {
logp.Info("reading messages...")
bt.running = true
defer func() {
bt.running = false
}()
sync, err, usersProcessed := make(chan byte), make(chan error), 0
for _, discordUser := range bt.discordUsers {
go processDiscordUser(bt, discordUser, sync, err)
}
for {
select {
case <-sync:
usersProcessed++
if usersProcessed == len(bt.discordUsers) {
return nil
}
case e := <-err:
return e
}
}
return nil
}
func (bt *Discobeat) getConfig() config.Config {
return bt.config
}
func (bt *Discobeat) publishNewEvent(guild *discordgo.UserGuild, channel *discordgo.Channel, message *discordgo.Message) error {
postedAt, err := message.Timestamp.Parse()
if err != nil {
return err
}
event := beat.Event{
Timestamp: time.Now(),
Fields: common.MapStr{
"type": message.Type,
"username": message.Author.Username,
"message": message.Content,
"channel": channel.Name,
"guild": guild.Name,
"postedAt": postedAt,
"attachments": message.Attachments,
},
}
bt.client.Publish(event)
return nil
}
func handleError(err error, sync chan byte, errC chan error) {
switch err.(type) {
case discordgo.RESTError:
logp.Err("discordgo REST error: %v", err)
sync <- 1
default:
logp.Err("error: %v", err)
errC <- err
}
}