.env.template

@@ -0,0 +1,3 @@
+SN_AUTH_COOKIE=
+DISCORD_TOKEN=
+DISCORD_CHANNEL_ID=

.gitignore

@@ -3,4 +3,3 @@
 
 # go executable
 hnbot
-hnbot.sqlite3

README.md

@@ -1,11 +1,7 @@
 # hnbot
 
-> Hello, I am a bot posting top stories from HN.
+> Hello, I am a bot crossposting top posts from HN.
 >
-> My original mission was to orange-pill HN by offering the OPs on HN to claim the sats their stories received here.
+> I curate content to only post stuff which could be interesting for the SN community on a best-efforts basis.
-However, my comments were shadowbanned and ultimately not approved by dang, the site admin.
-See this thread: [#164155](https://stacker.news/items/164155)
->
-> If you are one of these OPs and want to claim your sats, reply to this bio and we will find a solution!
 
--- https://stacker.news/hn
+-- https://stacker.news/items/161788

db/db.go

@@ -1,96 +0,0 @@
-package db
-
-import (
-	"database/sql"
-	"fmt"
-	"log"
-
-	"github.com/ekzyis/hnbot/hn"
-	_ "github.com/mattn/go-sqlite3"
-)
-
-var (
-	_db *sql.DB
-)
-
-func init() {
-	var err error
-	_db, err = sql.Open("sqlite3", "hnbot.sqlite3")
-	if err != nil {
-		log.Fatal(err)
-	}
-	migrate(_db)
-}
-
-func Query(query string, args ...interface{}) (*sql.Rows, error) {
-	return _db.Query(query, args...)
-}
-
-func migrate(db *sql.DB) {
-	if _, err := db.Exec(`
-		CREATE TABLE IF NOT EXISTS hn_items (
-			id INTEGER NOT NULL,
-			created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
-			time TIMESTAMP WITH TIMEZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
-			title TEXT NOT NULL,
-			url TEXT,
-			author TEXT NOT NULL,
-			ndescendants INTEGER NOT NULL,
-			score INTEGER NOT NULL,
-			rank INTEGER NOT NULL,
-			PRIMARY KEY (id, created_at)
-		);
-	`); err != nil {
-		err = fmt.Errorf("error during migration: %w", err)
-		log.Fatal(err)
-	}
-	if _, err := db.Exec(`
-		CREATE TABLE IF NOT EXISTS sn_items (
-			id INTEGER NOT NULL,
-			created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
-			hn_id INTEGER NOT NULL REFERENCES hn_items(id),
-			PRIMARY KEY (id, hn_id)
-		);
-	`); err != nil {
-		err = fmt.Errorf("error during migration: %w", err)
-		log.Fatal(err)
-	}
-}
-
-func ItemHasComment(parentId int) bool {
-	var count int
-	err := _db.QueryRow(`SELECT COUNT(1) FROM comments WHERE parent_id = ?`, parentId).Scan(&count)
-	if err != nil {
-		err = fmt.Errorf("error during item check: %w", err)
-		log.Fatal(err)
-	}
-	return count > 0
-}
-
-func SaveHnItems(story *[]hn.Item) error {
-	for i, s := range *story {
-		if err := SaveHnItem(&s, i+1); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func SaveHnItem(s *hn.Item, rank int) error {
-	if _, err := _db.Exec(`
-			INSERT INTO hn_items(id, time, title, url, author, ndescendants, score, rank)
-			VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
-		s.ID, s.Time, s.Title, s.Url, s.By, s.Descendants, s.Score, rank); err != nil {
-		err = fmt.Errorf("error during item insert: %w", err)
-		return err
-	}
-	return nil
-}
-
-func SaveSnItem(id int, hnId int) error {
-	if _, err := _db.Exec(`INSERT INTO sn_items(id, hn_id) VALUES (?, ?)`, id, hnId); err != nil {
-		err = fmt.Errorf("error during sn item insert: %w", err)
-		return err
-	}
-	return nil
-}

discord.go

@@ -0,0 +1,188 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/dustin/go-humanize"
+	"github.com/ekzyis/sn-goapi"
+	"github.com/joho/godotenv"
+	"github.com/namsral/flag"
+)
+
+var (
+	DiscordToken     string
+	dg               *discordgo.Session
+	DiscordChannelId string
+)
+
+func init() {
+	err := godotenv.Load()
+	if err != nil {
+		log.Fatal("Error loading .env file")
+	}
+	flag.StringVar(&DiscordToken, "DISCORD_TOKEN", "", "Discord bot token")
+	flag.StringVar(&DiscordChannelId, "DISCORD_CHANNEL_ID", "", "Discord channel id")
+	flag.Parse()
+	if DiscordToken == "" {
+		log.Fatal("DISCORD_TOKEN not set")
+	}
+	if DiscordChannelId == "" {
+		log.Fatal("DISCORD_CHANNEL_ID not set")
+	}
+	initBot()
+}
+
+func initBot() {
+	var err error
+	dg, err = discordgo.New("Bot " + DiscordToken)
+	if err != nil {
+		log.Fatal("error creating discord session:", err)
+	}
+	dg.AddHandler(func(s *discordgo.Session, event *discordgo.Ready) {
+		log.Println("Logged in as", event.User.Username)
+	})
+	dg.AddHandler(onMessage)
+	dg.AddHandler(onMessageReact)
+	dg.Identify.Intents = discordgo.IntentsGuildMessages | discordgo.IntentsMessageContent | discordgo.IntentGuildMessageReactions
+	err = dg.Open()
+	if err != nil {
+		log.Fatal("error opening connection to discord: ", err, " -- Is your token correct?")
+	}
+}
+
+func onMessage(s *discordgo.Session, m *discordgo.MessageCreate) {
+	if m.Author.ID == s.State.User.ID {
+		return
+	}
+	hackerNewsId, err := ParseHackerNewsLink(m.Content)
+	if err != nil {
+		return
+	}
+	story, err := FetchStoryById(hackerNewsId)
+	_, err = PostStoryToStackerNews(&story, PostStoryOptions{SkipDupes: false})
+	if err != nil {
+		var dupesErr *sn.DupesError
+		if errors.As(err, &dupesErr) {
+			SendDupesErrorToDiscord(hackerNewsId, dupesErr)
+			return
+		}
+		SendErrorToDiscord(err)
+	}
+}
+
+func onMessageReact(s *discordgo.Session, reaction *discordgo.MessageReactionAdd) {
+	if reaction.UserID == s.State.User.ID {
+		return
+	}
+	if reaction.Emoji.Name != "⏭️" {
+		return
+	}
+	m, err := s.ChannelMessage(reaction.ChannelID, reaction.MessageID)
+	if err != nil {
+		SendErrorToDiscord(err)
+		return
+	}
+	if len(m.Embeds) == 0 {
+		return
+	}
+	embed := m.Embeds[0]
+	if !strings.Contains(embed.Title, "dupe(s) found for") {
+		return
+	}
+	id, err := ParseHackerNewsLink(embed.Footer.Text)
+	if err != nil {
+		return
+	}
+	story, err := FetchStoryById(id)
+	if err != nil {
+		SendErrorToDiscord(err)
+		return
+	}
+	id, err = PostStoryToStackerNews(&story, PostStoryOptions{SkipDupes: true})
+	if err != nil {
+		SendErrorToDiscord(err)
+	}
+}
+
+func SendDupesErrorToDiscord(hackerNewsId int, dupesErr *sn.DupesError) {
+	msg := fmt.Sprint(dupesErr)
+	log.Println(msg)
+
+	title := fmt.Sprintf("%d dupe(s) found for %s:", len(dupesErr.Dupes), dupesErr.Url)
+	color := 0xffc107
+	var fields []*discordgo.MessageEmbedField
+	for _, dupe := range dupesErr.Dupes {
+		fields = append(fields,
+			&discordgo.MessageEmbedField{
+				Name:   "Title",
+				Value:  dupe.Title,
+				Inline: false,
+			},
+			&discordgo.MessageEmbedField{
+				Name:   "Id",
+				Value:  sn.FormatLink(dupe.Id),
+				Inline: true,
+			},
+			&discordgo.MessageEmbedField{
+				Name:   "Url",
+				Value:  dupe.Url,
+				Inline: true,
+			},
+			&discordgo.MessageEmbedField{
+				Name:   "User",
+				Value:  dupe.User.Name,
+				Inline: true,
+			},
+			&discordgo.MessageEmbedField{
+				Name:   "Created",
+				Value:  humanize.Time(dupe.CreatedAt),
+				Inline: true,
+			},
+			&discordgo.MessageEmbedField{
+				Name:   "Sats",
+				Value:  fmt.Sprint(dupe.Sats),
+				Inline: true,
+			},
+			&discordgo.MessageEmbedField{
+				Name:   "Comments",
+				Value:  fmt.Sprint(dupe.NComments),
+				Inline: true,
+			},
+		)
+	}
+
+	embed := discordgo.MessageEmbed{
+		Title:  title,
+		Color:  color,
+		Fields: fields,
+		Footer: &discordgo.MessageEmbedFooter{
+			Text:    HackerNewsItemLink(hackerNewsId),
+			IconURL: "https://news.ycombinator.com/y18.gif",
+		},
+	}
+	SendEmbedToDiscord(&embed)
+}
+
+func SendEmbedToDiscord(embed *discordgo.MessageEmbed) {
+	_, err := dg.ChannelMessageSendEmbed(DiscordChannelId, embed)
+	if err != nil {
+		err = fmt.Errorf("error during sending embed: %w", err)
+		log.Println(err)
+	}
+}
+
+func SendErrorToDiscord(err error) {
+	msg := fmt.Sprint(err)
+	log.Println(msg)
+
+	embed := discordgo.MessageEmbed{
+		Title:       "Error",
+		Color:       0xff0000,
+		Description: msg,
+	}
+	SendEmbedToDiscord(&embed)
+}

go.mod

@@ -1,12 +1,21 @@
-module github.com/ekzyis/hnbot
+module gitlab.com/ekzyis/hnbot
 
 go 1.20
 
 require (
 	github.com/dustin/go-humanize v1.0.1
-	github.com/ekzyis/snappy v0.8.0
 	github.com/joho/godotenv v1.5.1
-	github.com/mattn/go-sqlite3 v1.14.22
+	github.com/namsral/flag v1.7.4-pre
+	github.com/stretchr/testify v1.8.2
 )
 
-require gopkg.in/guregu/null.v4 v4.0.0 // indirect
+require (
+	github.com/bwmarrin/discordgo v0.27.1 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/ekzyis/sn-goapi v0.1.1 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b // indirect
+	golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -1,10 +1,39 @@
+github.com/bwmarrin/discordgo v0.27.1 h1:ib9AIc/dom1E/fSIulrBwnez0CToJE113ZGt4HoliGY=
+github.com/bwmarrin/discordgo v0.27.1/go.mod h1:NJZpH+1AfhIcyQsPeuBKsUtYrRnjkyu0kIVMCHkZtRY=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
-github.com/ekzyis/snappy v0.8.0 h1:e7dRR384XJgNYa1FWNIZmqITSHOSanteBFXQJPfcQwg=
+github.com/ekzyis/sn-goapi v0.1.0 h1:B/v120DgYlpuzqkyiRTMb6C7JIoU3RaYE9M8D6m6OLQ=
-github.com/ekzyis/snappy v0.8.0/go.mod h1:UksYI0dU0+cnzz0LQjWB1P0QQP/ghx47e4atP99a5Lk=
+github.com/ekzyis/sn-goapi v0.1.0/go.mod h1:FObbYr/NXgnXNWU+EwiWKoWQy+wAaRS6AoW3NgsJ/Oo=
+github.com/ekzyis/sn-goapi v0.1.1 h1:FLCbaAIZ1qngtFZTfzkrp4HPFzHUPStdUgLHUPz82Jo=
+github.com/ekzyis/sn-goapi v0.1.1/go.mod h1:FObbYr/NXgnXNWU+EwiWKoWQy+wAaRS6AoW3NgsJ/Oo=
+github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
+github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
 github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
-github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
+github.com/namsral/flag v1.7.4-pre h1:b2ScHhoCUkbsq0d2C15Mv+VU8bl8hAXV8arnWiOHNZs=
-github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/namsral/flag v1.7.4-pre/go.mod h1:OXldTctbM6SWH1K899kPZcf65KxJiD7MsceFUpB5yDo=
-gopkg.in/guregu/null.v4 v4.0.0 h1:1Wm3S1WEA2I26Kq+6vcW+w0gcDo44YKYD7YIEJNHDjg=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-gopkg.in/guregu/null.v4 v4.0.0/go.mod h1:YoQhUrADuG3i9WqesrCmpNRwm1ypAgSHYqoOcTu/JrI=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b h1:7mWr3k41Qtv8XlltBkDkl8LoP3mpSgBW8BUoxtEdbXg=
+golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

hn.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
+	"net/http"
+	"regexp"
+	"strconv"
+)
+
+type Story struct {
+	ID          int
+	By          string // username of author
+	Time        int    // UNIX timestamp
+	Descendants int    // number of comments
+	Kids        []int
+	Score       int
+	Title       string
+	Url         string
+}
+
+var (
+	HackerNewsUrl         = "https://news.ycombinator.com"
+	HackerNewsFirebaseUrl = "https://hacker-news.firebaseio.com/v0"
+	HackerNewsLinkRegexp  = regexp.MustCompile(`(?:https?:\/\/)?news\.ycombinator\.com\/item\?id=([0-9]+)`)
+)
+
+func FetchHackerNewsTopStories() ([]Story, error) {
+	log.Println("Fetching HN top stories ...")
+
+	// API docs: https://github.com/HackerNews/API
+	url := fmt.Sprintf("%s/topstories.json", HackerNewsFirebaseUrl)
+	resp, err := http.Get(url)
+	if err != nil {
+		err = fmt.Errorf("error fetching HN top stories %w:", err)
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	var ids []int
+	err = json.NewDecoder(resp.Body).Decode(&ids)
+	if err != nil {
+		err = fmt.Errorf("error decoding HN top stories JSON: %w", err)
+		return nil, err
+	}
+
+	// we are only interested in the first page of top stories
+	const limit = 30
+	ids = ids[:limit]
+
+	var stories [limit]Story
+	for i, id := range ids {
+		story, err := FetchStoryById(id)
+		if err != nil {
+			return nil, err
+		}
+		stories[i] = story
+	}
+
+	log.Println("Fetching HN top stories ... OK")
+	// Can't return [30]Story as []Story so we copy the array
+	return stories[:], nil
+}
+
+func FetchStoryById(id int) (Story, error) {
+	log.Printf("Fetching HN story (id=%d) ...\n", id)
+
+	url := fmt.Sprintf("https://hacker-news.firebaseio.com/v0/item/%d.json", id)
+	resp, err := http.Get(url)
+	if err != nil {
+		err = fmt.Errorf("error fetching HN story (id=%d): %w", id, err)
+		return Story{}, err
+	}
+	defer resp.Body.Close()
+
+	var story Story
+	err = json.NewDecoder(resp.Body).Decode(&story)
+	if err != nil {
+		err := fmt.Errorf("error decoding HN story JSON (id=%d): %w", id, err)
+		return Story{}, err
+	}
+
+	log.Printf("Fetching HN story (id=%d) ... OK\n", id)
+	return story, nil
+}
+
+func ParseHackerNewsLink(link string) (int, error) {
+	match := HackerNewsLinkRegexp.FindStringSubmatch(link)
+	if len(match) == 0 {
+		return -1, errors.New("input is not a hacker news link")
+	}
+	id, err := strconv.Atoi(match[1])
+	if err != nil {
+		return -1, errors.New("integer conversion to string failed")
+	}
+	return id, nil
+}
+
+func HackerNewsUserLink(user string) string {
+	return fmt.Sprintf("%s/user?id=%s", HackerNewsUrl, user)
+}
+
+func HackerNewsItemLink(id int) string {
+	return fmt.Sprintf("%s/item?id=%d", HackerNewsUrl, id)
+}

hn/hn.go

@@ -1,105 +0,0 @@
-package hn
-
-import (
-	"encoding/json"
-	"errors"
-	"fmt"
-	"log"
-	"net/http"
-	"regexp"
-	"strconv"
-)
-
-type Item struct {
-	ID          int
-	By          string // username of author
-	Time        int    // UNIX timestamp
-	Descendants int    // number of comments
-	Kids        []int
-	Score       int
-	Title       string
-	Url         string
-}
-
-var (
-	hnUrl         = "https://news.ycombinator.com"
-	hnFirebaseUrl = "https://hacker-news.firebaseio.com/v0"
-	hnLinkRegexp  = regexp.MustCompile(`(?:https?:\/\/)?news\.ycombinator\.com\/item\?id=([0-9]+)`)
-)
-
-func FetchTopItems() ([]Item, error) {
-	log.Println("[hn] fetch top items ...")
-
-	// API docs: https://github.com/HackerNews/API
-	url := fmt.Sprintf("%s/topstories.json", hnFirebaseUrl)
-	resp, err := http.Get(url)
-	if err != nil {
-		return nil, fmt.Errorf("error fetching HN top stories %w:", err)
-	}
-	defer resp.Body.Close()
-
-	var ids []int
-	err = json.NewDecoder(resp.Body).Decode(&ids)
-	if err != nil {
-		return nil, fmt.Errorf("error decoding HN top stories JSON: %w", err)
-	}
-
-	// we are only interested in the first page of top stories
-	const limit = 30
-	ids = ids[:limit]
-
-	var stories [limit]Item
-	for i, id := range ids {
-		var item Item
-		err := FetchItemById(id, &item)
-		if err != nil {
-			return nil, err
-		}
-		stories[i] = item
-	}
-
-	log.Println("[hn] fetch top items ... OK")
-	// Can't return [30]Item as []Item so we copy the array
-	return stories[:], nil
-}
-
-func FetchItemById(id int, hnItem *Item) error {
-	// log.Printf("[hn] fetch HN item %d ...\n", id)
-
-	url := fmt.Sprintf("https://hacker-news.firebaseio.com/v0/item/%d.json", id)
-	resp, err := http.Get(url)
-	if err != nil {
-		err = fmt.Errorf("error fetching HN item %d: %w", id, err)
-		return err
-	}
-	defer resp.Body.Close()
-
-	err = json.NewDecoder(resp.Body).Decode(&hnItem)
-	if err != nil {
-		err := fmt.Errorf("error decoding JSON for HN item %d: %w", id, err)
-		return err
-	}
-
-	// log.Printf("[hn] fetch HN item %d ... OK\n", id)
-	return nil
-}
-
-func ParseLink(link string) (int, error) {
-	match := hnLinkRegexp.FindStringSubmatch(link)
-	if len(match) == 0 {
-		return -1, errors.New("not a hacker news link")
-	}
-	id, err := strconv.Atoi(match[1])
-	if err != nil {
-		return -1, errors.New("integer conversion to string failed")
-	}
-	return id, nil
-}
-
-func UserLink(user string) string {
-	return fmt.Sprintf("%s/user?id=%s", hnUrl, user)
-}
-
-func ItemLink(id int) string {
-	return fmt.Sprintf("%s/item?id=%d", hnUrl, id)
-}

main.go

@@ -5,73 +5,69 @@ import (
 	"log"
 	"time"
 
-	"github.com/ekzyis/hnbot/db"
+	"github.com/ekzyis/sn-goapi"
-	"github.com/ekzyis/hnbot/hn"
-	sn "github.com/ekzyis/hnbot/sn"
-	"github.com/joho/godotenv"
 )
 
-func SyncHnItemsToDb() {
+func WaitUntilNextHour() {
-	for {
+	now := time.Now()
+	dur := now.Truncate(time.Hour).Add(time.Hour).Sub(now)
+	log.Println("sleeping for", dur.Round(time.Second))
+	time.Sleep(dur)
+}
+
+func WaitUntilNextMinute() {
 	now := time.Now()
 	dur := now.Truncate(time.Minute).Add(time.Minute).Sub(now)
-		log.Println("[hn] sleeping for", dur.Round(time.Second))
+	log.Println("sleeping for", dur.Round(time.Second))
 	time.Sleep(dur)
+}
 
-		stories, err := hn.FetchTopItems()
+func CheckNotifications() {
+	var prevHasNewNotes bool
+	for {
+		hasNewNotes, err := sn.CheckNotifications()
 		if err != nil {
-			log.Println(err)
+			SendErrorToDiscord(err)
-			continue
+		} else {
+			if !prevHasNewNotes && hasNewNotes {
+				// only send embed on "rising edge"
+				SendNotificationsEmbedToDiscord()
+				log.Println("Forwarded to monitoring")
+			} else if hasNewNotes {
+				log.Println("Already forwarded")
 			}
-		if err := db.SaveHnItems(&stories); err != nil {
-			log.Println(err)
-			continue
 		}
+		prevHasNewNotes = hasNewNotes
+		WaitUntilNextMinute()
 	}
 }
 
 func main() {
-	if err := godotenv.Load(); err != nil {
+	go CheckNotifications()
-		log.Fatal(err)
-	}
-
-	// fetch HN front page every minute in the background and store state in db
-	go SyncHnItemsToDb()
-
-	// check every 15 minutes if there is now a HN item that is worth posting to SN
 	for {
-		var (
-			filtered *[]hn.Item
-			err      error
-		)
 
-		now := time.Now()
+		stories, err := FetchHackerNewsTopStories()
-		dur := now.Truncate(time.Minute).Add(15 * time.Minute).Sub(now)
+		if err != nil {
-		log.Println("[sn] sleeping for", dur.Round(time.Second))
+			SendErrorToDiscord(err)
-		time.Sleep(dur)
+			WaitUntilNextHour()
-
-		if filtered, err = sn.CurateContent(); err != nil {
-			log.Println(err)
 			continue
 		}
 
-		log.Printf("[sn] found %d item(s) to post\n", len(*filtered))
+		filtered := CurateContentForStackerNews(&stories)
 
-		for _, item := range *filtered {
+		for _, story := range *filtered {
-			_, err := sn.Post(&item, sn.PostOptions{SkipDupes: false})
+			_, err := PostStoryToStackerNews(&story, PostStoryOptions{SkipDupes: false})
 			if err != nil {
 				var dupesErr *sn.DupesError
 				if errors.As(err, &dupesErr) {
-					log.Println(dupesErr)
+					SendDupesErrorToDiscord(story.ID, dupesErr)
-					parentId := dupesErr.Dupes[0].Id
-					if err := db.SaveSnItem(parentId, item.ID); err != nil {
-						log.Println(err)
-					}
 					continue
 				}
-				log.Println(err)
+				SendErrorToDiscord(err)
 				continue
 			}
-		}
+			log.Println("Posting to SN ... OK")
+		}
+		WaitUntilNextHour()
 	}
 }

sn.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/dustin/go-humanize"
+	"github.com/ekzyis/sn-goapi"
+)
+
+func CurateContentForStackerNews(stories *[]Story) *[]Story {
+	// TODO: filter by relevance
+
+	slice := (*stories)[0:1]
+	return &slice
+}
+
+type PostStoryOptions struct {
+	SkipDupes bool
+}
+
+func PostStoryToStackerNews(story *Story, options PostStoryOptions) (int, error) {
+	log.Printf("Posting to SN (url=%s) ...\n", story.Url)
+
+	if !options.SkipDupes {
+		dupes, err := sn.Dupes(story.Url)
+		if err != nil {
+			return -1, err
+		}
+		if len(*dupes) > 0 {
+			return -1, &sn.DupesError{Url: story.Url, Dupes: *dupes}
+		}
+	}
+
+	parentId, err := sn.PostLink(story.Url, story.Title, "bitcoin")
+	if err != nil {
+		return -1, fmt.Errorf("error posting link: %w", err)
+	}
+
+	log.Printf("Posting to SN (url=%s) ... OK \n", story.Url)
+	SendStackerNewsEmbedToDiscord(story.Title, parentId)
+
+	comment := fmt.Sprintf(
+		"This link was posted by [%s](%s) %s on [HN](%s). It received %d points and %d comments.",
+		story.By,
+		HackerNewsUserLink(story.By),
+		humanize.Time(time.Unix(int64(story.Time), 0)),
+		HackerNewsItemLink(story.ID),
+		story.Score, story.Descendants,
+	)
+	sn.CreateComment(parentId, comment)
+	return parentId, nil
+}
+
+func SendStackerNewsEmbedToDiscord(title string, id int) {
+	Timestamp := time.Now().Format(time.RFC3339)
+	url := sn.FormatLink(id)
+	color := 0xffc107
+	embed := discordgo.MessageEmbed{
+		Title: title,
+		URL:   url,
+		Color: color,
+		Footer: &discordgo.MessageEmbedFooter{
+			Text:    "Stacker News",
+			IconURL: "https://stacker.news/favicon.png",
+		},
+		Timestamp: Timestamp,
+	}
+	SendEmbedToDiscord(&embed)
+}
+
+func SendNotificationsEmbedToDiscord() {
+	Timestamp := time.Now().Format(time.RFC3339)
+	color := 0xffc107
+	embed := discordgo.MessageEmbed{
+		Title: "new notifications",
+		URL:   "https://stacker.news/hn/posts",
+		Color: color,
+		Footer: &discordgo.MessageEmbedFooter{
+			Text:    "Stacker News",
+			IconURL: "https://stacker.news/favicon-notify.png",
+		},
+		Timestamp: Timestamp,
+	}
+	SendEmbedToDiscord(&embed)
+}

sn/sn.go

@@ -1,102 +0,0 @@
-package sn
-
-import (
-	"database/sql"
-	"fmt"
-	"log"
-	"time"
-
-	"github.com/dustin/go-humanize"
-	"github.com/ekzyis/hnbot/db"
-	"github.com/ekzyis/hnbot/hn"
-	sn "github.com/ekzyis/snappy"
-)
-
-type DupesError = sn.DupesError
-
-func CurateContent() (*[]hn.Item, error) {
-	var (
-		rows *sql.Rows
-		err  error
-	)
-	if rows, err = db.Query(`
-		SELECT t.id, time, title, url, author, score, ndescendants
-		FROM (
-			SELECT id, MIN(created_at) AS start, MAX(created_at) AS end
-			FROM hn_items
-			WHERE rank = 1 AND id NOT IN (SELECT hn_id FROM sn_items) AND length(title) >= 5
-			GROUP BY id
-			HAVING unixepoch(end) - unixepoch(start) >= 3600
-			ORDER BY time ASC
-			LIMIT 1
-		) t JOIN hn_items ON t.id = hn_items.id AND t.end = hn_items.created_at;
-	`); err != nil {
-		err = fmt.Errorf("error querying hn_items: %w", err)
-		return nil, err
-	}
-	defer rows.Close()
-
-	var items []hn.Item
-	for rows.Next() {
-		var item hn.Item
-		if err = rows.Scan(&item.ID, &item.Time, &item.Title, &item.Url, &item.By, &item.Score, &item.Descendants); err != nil {
-			err = fmt.Errorf("error scanning hn_items: %w", err)
-			return nil, err
-		}
-		items = append(items, item)
-	}
-	if err = rows.Err(); err != nil {
-		err = fmt.Errorf("error iterating hn_items: %w", err)
-		return nil, err
-	}
-	return &items, nil
-}
-
-type PostOptions struct {
-	SkipDupes bool
-}
-
-func Post(item *hn.Item, options PostOptions) (int, error) {
-	c := sn.NewClient()
-	url := item.Url
-	if url == "" {
-		url = hn.ItemLink(item.ID)
-	}
-	log.Printf("post to SN: %s ...\n", url)
-
-	if !options.SkipDupes {
-		dupes, err := c.Dupes(url)
-		if err != nil {
-			return -1, err
-		}
-		if len(*dupes) > 0 {
-			return -1, &sn.DupesError{Url: url, Dupes: *dupes}
-		}
-	}
-
-	title := item.Title
-	if len(title) > 80 {
-		title = title[0:80]
-	}
-
-	comment := fmt.Sprintf(
-		"This link was posted by [%s](%s) %s on [HN](%s). It received %d points and %d comments.",
-		item.By,
-		hn.UserLink(item.By),
-		humanize.Time(time.Unix(int64(item.Time), 0)),
-		hn.ItemLink(item.ID),
-		item.Score, item.Descendants,
-	)
-
-	parentId, err := c.PostLink(url, title, comment, "tech")
-	if err != nil {
-		return -1, fmt.Errorf("error posting link: %w", err)
-	}
-
-	log.Printf("post to SN: %s ... OK \n", url)
-	if err := db.SaveSnItem(parentId, item.ID); err != nil {
-		return -1, err
-	}
-
-	return parentId, nil
-}