broadcast-war/main.go

package main

import (
	"bytes"
	"database/sql"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"regexp"
	"strconv"
	"strings"
	"time"

	// https://golang.org/ref/spec#Import_declarations
	_ "github.com/lib/pq"
)

// Faction is a struct that holds data about a faction
type Faction struct {
	webhookGeneral string
	webhookWar     string
	name           string
	id             int
}

// Event from http://api.orn.com/user
type Event struct {
	id        int
	timestamp time.Time
	news      string
}

// Events array of Event
type Events []Event

// Attack struct
type Attack struct {
	id        int
	timestamp time.Time
	news      string
}

// Attacks array of Attack
type Attacks []Attack

// News to be broadcast
type News struct {
	Content string `json:"content"`
}

func main() {
	duration := time.Duration(10) * time.Second
	time.Sleep(duration)
	var err error
	var e Event
	timeFormat := "2006-01-02 15:04:05"
	relentless := Faction{
		webhookGeneral: "https://discordapp.com/api/webhooks/330506556820946946/gzReDE9EKFei05twvoFSZgRkAdAG523YTNLy2T_c5NDwagapwgGyhTrjFq_Y2_zu1fOK",
		webhookWar:     "https://discordapp.com/api/webhooks/330163061573025792/m9qS_4FawQwaWN11Y-qDKC2CeBlcR2r7Q9muISiVjW7LVpKrPNcYudNkPf2Y_ZD3sWf6",
		name:           "Relentless",
		id:             8336}
	unrelenting := Faction{
		webhookGeneral: "https://discordapp.com/api/webhooks/330303142367461376/R9v8SQqZz8J-nyQuDAcU-xA7GNt_DsMzZ30LI6qJmebDJzLOfQoCLvX07YBrjoZTHAVI",
		webhookWar:     "https://discordapp.com/api/webhooks/330303142367461376/R9v8SQqZz8J-nyQuDAcU-xA7GNt_DsMzZ30LI6qJmebDJzLOfQoCLvX07YBrjoZTHAVI",
		name:           "Unrelenting",
		id:             20747}
	factions := []Faction{relentless, unrelenting}
	for _, faction := range factions {
		e, err = getEventsFromDatabase(faction.name)
		if err != nil {
			log.Println("Database error:", err)
		}
		if e.id > 0 {
			fmt.Println("*** Processing: " + faction.name)
			var code int
			e.news = strings.Replace(e.news, "[", "\\[", -1)
			news := replaceLinks(e.news)
			news = strings.Replace(news, "http:", "https:", -1)
			news = "`" + e.timestamp.UTC().Format(timeFormat) + "`: " + news
			fmt.Println(faction.name + ": " + news)
			code, err = broadcastNews(news, faction.webhookGeneral) // general
			if err != nil {
				log.Println("broadcast error:", err)
			}
			fmt.Println(faction.name + ": " + strconv.Itoa(code))
			if code == 204 {
				// Assuming sent
				err = setBroadcastTrue(e.id)
				if err != nil {
					log.Fatal(err)
				}
			}
		}

		// Attacks
		attacks, err := getAttackFromDatabase(faction.name)
		if err != nil {
			log.Println("Database error:", err)
		}
		for key, attack := range attacks {
			fmt.Printf("attacks[%d].id: %d\n", key, attack.id)
			err = broadcastSingleAttack(attack, faction)
			if err != nil {
				log.Println(err)
			}
		}
		//a := attacks[0]

	}
}

func getEventsFromDatabase(factionName string) (Event, error) {
	var err error
	var e Event
	db, err := sql.Open("postgres", "user="+pgUser+" dbname="+pgTable+" password="+pgPasswd)
	if err != nil {
		return e, err
	}
	defer db.Close()

	rows, err := db.Query(`SELECT id, timestamp, news FROM events WHERE faction = '` +
		factionName + `' AND broadcast = FALSE ORDER BY id ASC LIMIT 1;`)
	if err != nil {
		return e, err
	}
	defer rows.Close()
	for rows.Next() {
		rows.Scan(&e.id, &e.timestamp, &e.news)
		if err != nil {
			return e, err
		}
		fmt.Println(e)
	}
	if err := rows.Err(); err != nil {
		return e, err
	}
	return e, nil
}

func getAttackFromDatabase(factionName string) (Attacks, error) {
	var err error
	var a Attack
	var attacks Attacks
	db, err := sql.Open("postgres", "user="+pgUser+" dbname="+pgTable+" password="+pgPasswd)
	if err != nil {
		return attacks, err
	}
	defer db.Close()

	rows, err := db.Query("SELECT id, timestamp, news FROM attacks WHERE faction = '" +
		factionName + "' AND broadcast = FALSE ORDER BY id ASC;")
	if err != nil {
		return attacks, err
	}
	defer rows.Close()
	for rows.Next() {
		rows.Scan(&a.id, &a.timestamp, &a.news)
		if err != nil {
			return attacks, err
		}
		attacks = append(attacks, a)
		fmt.Println(a)
	}
	if err := rows.Err(); err != nil {
		return attacks, err
	}
	return attacks, nil
}

func (e Event) String() string {
	line := fmt.Sprintf("{\n\t\"id\": %d,", e.id)
	line += fmt.Sprintf("\n\t\"timestamp\": %s,", e.timestamp)
	line += fmt.Sprintf("\n\t\"news\": %s", e.news)
	line += fmt.Sprintf("\n}")
	return line
}

func (a Attack) String() string {
	line := fmt.Sprintf("{\n\t\"id\": %d,", a.id)
	line += fmt.Sprintf("\n\t\"timestamp\": %s,", a.timestamp)
	line += fmt.Sprintf("\n\t\"news\": %s", a.news)
	line += fmt.Sprintf("\n}")
	return line
}

func replaceLinks(news string) string {
	re := regexp.MustCompile(`<[aA].*?href\s?=\s?"?(.*?)[ "]?(?: .*?)?>(.*?)<\/a>`)
	fmt.Println(re.FindAllStringSubmatch(news, -1))
	return re.ReplaceAllString(news, "[${2}](${1})")
	//return news
}

func broadcastNews(new string, webhook string) (int, error) {
	// var err error
	var news News
	news.Content = new
	jsonValue, err := json.Marshal(news)
	if err != nil {
		return -1, err
	}
	fmt.Println(string(jsonValue))
	resp, err := http.Post(webhook, "application/json", bytes.NewBuffer(jsonValue))
	if err != nil {
		return -1, err
	}
	return resp.StatusCode, nil
}

func broadcastSingleAttack(attack Attack, faction Faction) error {
	timeFormat := "2006-01-02 15:04:05"
	if attack.id > 0 {
		members, err := getRelentlessMembers()
		if err != nil {
			log.Println("Database error:", err)
		}
		news := replaceLinks(attack.news)
		fmt.Println("Links replaced", news)
		news = strings.Replace(news, "http:", "https:", -1)
		for _, val := range members {
			news = strings.Replace(news, val, "**"+val+"**", -1)
		}
		news = strings.Replace(news, "_", "\\_", -1)
		news = attack.timestamp.UTC().Format(timeFormat) + ": " + news
		code, err := broadcastNews(news, faction.webhookWar) // war
		if err != nil {
			log.Println("broadcast error:", err)
		}
		fmt.Println(faction.name + ": " + strconv.Itoa(code))
		if code == 204 {
			// Assuming sent
			setAttackBroadcastTrue(attack.id)
		}
	}
	return nil
}

func setBroadcastTrue(id int) error {
	fmt.Println(id)
	var err error
	db, err := sql.Open("postgres", "user="+pgUser+" dbname="+pgTable+" password="+pgPasswd)
	if err != nil {
		return err
	}
	defer db.Close()

	tx, err := db.Begin()
	if err != nil {
		log.Fatal(err)
	}
	defer tx.Rollback()

	tx.Exec(`SET TIME ZONE 'utc'`)
	stmt, err := tx.Prepare("UPDATE events SET broadcast = TRUE WHERE id = $1;")
	if err != nil {
		return err
	}
	_, err = stmt.Exec(fmt.Sprintf("%d", id))
	if err != nil {
		return err
	}
	err = tx.Commit()
	if err != nil {
		return err
	}

	return nil
}

func setAttackBroadcastTrue(id int) error {
	fmt.Println(id)
	var err error
	db, err := sql.Open("postgres", "user="+pgUser+" dbname="+pgTable+" password="+pgPasswd)
	if err != nil {
		return err
	}
	defer db.Close()

	tx, err := db.Begin()
	if err != nil {
		log.Fatal(err)
	}
	defer tx.Rollback()

	tx.Exec(`SET TIME ZONE 'utc'`)
	stmt, err := tx.Prepare("UPDATE attacks SET broadcast = TRUE WHERE id = $1;")
	if err != nil {
		return err
	}
	_, err = stmt.Exec(fmt.Sprintf("%d", id))
	if err != nil {
		return err
	}
	err = tx.Commit()
	if err != nil {
		return err
	}

	return nil
}

func getRelentlessMembers() ([]string, error) {
	var members []string
	var err error
	db, err := sql.Open("postgres", "user="+pgUser+" dbname="+pgTable+" password="+pgPasswd)
	if err != nil {
		return members, err
	}
	defer db.Close()

	rows, err := db.Query("SELECT member_name FROM members WHERE status = 'joined';")
	if err != nil {
		return members, err
	}
	defer rows.Close()
	var name string
	for rows.Next() {
		rows.Scan(&name)
		if err != nil {
			return members, err
		}
		members = append(members, name)
	}
	if err := rows.Err(); err != nil {
		return members, err
	}
	return members, nil

}