Rewrite Pastel from Python to Go with watchlist feature
Full rewrite of the gaming deals Matrix bot in Go for better performance and a single static binary. Includes all original functionality (CheapShark, ITAD, Epic free games, multi-currency pricing, dedup, preflight checks, presence heartbeat) plus a new watchlist feature where users can DM the bot to watch for specific game deals with 180-day auto-expiry. New: systemd service file, DB migration script for Python-to-Go transition. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
prosolis
232
internal/deals/itad.go
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232
internal/deals/itad.go
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package deals
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"log/slog"
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"net/http"
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"strings"
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"time"
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)
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type ITADDeal struct {
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GameID string
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Slug string
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Title string
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Type string
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Discount int
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Price float64
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Regular float64
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Currency string
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ShopName string
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ShopID int
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URL string
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Flag string // "H" = historical low, "N" = new low
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Timestamp time.Time
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Expiry *time.Time
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DedupID string
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IsHistLow bool
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}
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type itadResponse struct {
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List []itadEntry `json:"list"`
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}
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type itadEntry struct {
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ID string `json:"id"`
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Slug string `json:"slug"`
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Title string `json:"title"`
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Type string `json:"type"`
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Deal struct {
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Shop struct {
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ID int `json:"id"`
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Name string `json:"name"`
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} `json:"shop"`
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Price struct {
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Amount float64 `json:"amount"`
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Currency string `json:"currency"`
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} `json:"price"`
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Regular struct {
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Amount float64 `json:"amount"`
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Currency string `json:"currency"`
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} `json:"regular"`
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Cut int `json:"cut"`
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URL string `json:"url"`
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Flag string `json:"flag"`
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Timestamp string `json:"timestamp"`
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Expiry *string `json:"expiry"`
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} `json:"deal"`
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}
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// FetchITADDeals fetches deals from ITAD API v2.
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func FetchITADDeals(apiKey string, limit int) ([]ITADDeal, error) {
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if limit > 200 {
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limit = 200
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}
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url := fmt.Sprintf(
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"https://api.isthereanydeal.com/deals/v2?key=%s&sort=-cut&limit=%d&nondeals=false",
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apiKey, limit,
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)
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resp, err := http.Get(url)
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if err != nil {
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return nil, fmt.Errorf("itad request failed: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("itad returned status %d", resp.StatusCode)
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}
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var result itadResponse
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if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
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return nil, fmt.Errorf("itad decode failed: %w", err)
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}
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var deals []ITADDeal
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for _, e := range result.List {
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// Only include games and DLC
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t := strings.ToLower(e.Type)
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if t != "game" && t != "dlc" {
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continue
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}
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deal := ITADDeal{
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GameID: e.ID,
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Slug: e.Slug,
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Title: e.Title,
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Type: e.Type,
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Discount: e.Deal.Cut,
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Price: e.Deal.Price.Amount,
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Regular: e.Deal.Regular.Amount,
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Currency: e.Deal.Price.Currency,
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ShopName: e.Deal.Shop.Name,
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ShopID: e.Deal.Shop.ID,
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URL: e.Deal.URL,
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Flag: e.Deal.Flag,
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IsHistLow: e.Deal.Flag == "H" || e.Deal.Flag == "N",
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DedupID: fmt.Sprintf("itad-%s-%d-%d", e.ID, e.Deal.Shop.ID, e.Deal.Cut),
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}
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if ts, err := time.Parse(time.RFC3339, e.Deal.Timestamp); err == nil {
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deal.Timestamp = ts
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}
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if e.Deal.Expiry != nil {
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if exp, err := time.Parse(time.RFC3339, *e.Deal.Expiry); err == nil {
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deal.Expiry = &exp
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}
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}
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deals = append(deals, deal)
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}
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return deals, nil
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}
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// FilterITADDeals filters ITAD deals by discount and price thresholds.
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func FilterITADDeals(deals []ITADDeal, minDiscount int, maxPrice float64) []ITADDeal {
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var filtered []ITADDeal
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for _, d := range deals {
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if d.Discount < minDiscount {
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slog.Debug("itad: skipping (low discount)", "title", d.Title, "discount", d.Discount)
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continue
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}
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if d.Price > maxPrice {
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slog.Debug("itad: skipping (too expensive)", "title", d.Title, "price", d.Price)
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continue
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}
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filtered = append(filtered, d)
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}
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return filtered
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}
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// LookupHistoricalLows checks if games are at their historical low price via ITAD.
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// Takes a map of steamAppID -> deal index, returns map of steamAppID -> isHistoricalLow.
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func LookupHistoricalLows(apiKey string, steamAppIDs []string) (map[string]bool, error) {
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result := make(map[string]bool)
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if apiKey == "" || len(steamAppIDs) == 0 {
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return result, nil
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}
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// Step 1: Look up ITAD game IDs from Steam app IDs
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itadIDs := make(map[string]string) // steamAppID -> itadID
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for _, appID := range steamAppIDs {
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if appID == "" || appID == "0" {
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continue
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}
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url := fmt.Sprintf(
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"https://api.isthereanydeal.com/games/lookup/v1?key=%s&appid=%s",
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apiKey, appID,
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)
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resp, err := http.Get(url)
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if err != nil {
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slog.Warn("itad lookup failed", "appid", appID, "error", err)
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continue
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}
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var lookup struct {
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Found bool `json:"found"`
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Game struct {
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ID string `json:"id"`
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} `json:"game"`
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}
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if err := json.NewDecoder(resp.Body).Decode(&lookup); err != nil {
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resp.Body.Close()
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continue
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}
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resp.Body.Close()
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if lookup.Found {
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itadIDs[appID] = lookup.Game.ID
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}
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}
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if len(itadIDs) == 0 {
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return result, nil
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}
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// Step 2: Get price overview for all looked-up games
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var gameIDs []string
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itadToSteam := make(map[string]string)
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for steamID, itadID := range itadIDs {
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gameIDs = append(gameIDs, itadID)
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itadToSteam[itadID] = steamID
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}
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body, _ := json.Marshal(gameIDs)
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url := fmt.Sprintf("https://api.isthereanydeal.com/games/overview/v2?key=%s", apiKey)
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resp, err := http.Post(url, "application/json", bytes.NewReader(body))
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if err != nil {
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return result, fmt.Errorf("itad overview request failed: %w", err)
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}
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defer resp.Body.Close()
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var overview struct {
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Prices []struct {
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ID string `json:"id"`
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Current struct {
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Price struct {
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Amount float64 `json:"amount"`
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} `json:"price"`
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} `json:"current"`
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Lowest struct {
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Price struct {
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Amount float64 `json:"amount"`
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} `json:"price"`
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} `json:"lowest"`
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} `json:"prices"`
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}
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if err := json.NewDecoder(resp.Body).Decode(&overview); err != nil {
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return result, fmt.Errorf("itad overview decode failed: %w", err)
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}
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for _, p := range overview.Prices {
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if steamID, ok := itadToSteam[p.ID]; ok {
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result[steamID] = p.Current.Price.Amount <= p.Lowest.Price.Amount
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}
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}
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return result, nil
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}
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