refactor: rename updater package to update

internal/update/check.go

@@ -0,0 +1,118 @@
+package update
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/mathismqn/godeez/internal/buildinfo"
+	"github.com/mathismqn/godeez/internal/fsutil"
+)
+
+const noCheckEnv = "GODEEZ_NO_UPDATE_CHECK"
+
+const (
+	cacheTTL     = 24 * time.Hour
+	checkTimeout = 3 * time.Second
+)
+
+type cacheEntry struct {
+	CheckedAt     time.Time `json:"checked_at"`
+	LatestVersion string    `json:"latest_version"`
+}
+
+func cachePath() (string, error) {
+	dir, err := os.UserCacheDir()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, "godeez", "update.json"), nil
+}
+
+func readCache() (cacheEntry, bool) {
+	path, err := cachePath()
+	if err != nil {
+		return cacheEntry{}, false
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return cacheEntry{}, false
+	}
+
+	var entry cacheEntry
+	if err := json.Unmarshal(data, &entry); err != nil {
+		return cacheEntry{}, false
+	}
+	if entry.LatestVersion == "" || time.Since(entry.CheckedAt) > cacheTTL {
+		return cacheEntry{}, false
+	}
+
+	return entry, true
+}
+
+func writeCache(version string) error {
+	path, err := cachePath()
+	if err != nil {
+		return err
+	}
+	if err := fsutil.EnsureDir(filepath.Dir(path)); err != nil {
+		return err
+	}
+
+	data, err := json.Marshal(cacheEntry{CheckedAt: time.Now(), LatestVersion: version})
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(path, data, 0644)
+}
+
+func check(ctx context.Context) (string, error) {
+	if entry, ok := readCache(); ok {
+		return newerThanCurrent(entry.LatestVersion), nil
+	}
+
+	release, err := New().Latest(ctx)
+	if err != nil {
+		return "", err
+	}
+
+	latest := release.Version()
+	_ = writeCache(latest)
+
+	return newerThanCurrent(latest), nil
+}
+
+func newerThanCurrent(latest string) string {
+	if IsNewer(buildinfo.Version(), latest) {
+		return latest
+	}
+
+	return ""
+}
+
+func StartCheck(ctx context.Context) <-chan string {
+	ch := make(chan string, 1)
+
+	if os.Getenv(noCheckEnv) != "" || buildinfo.IsDev() {
+		close(ch)
+		return ch
+	}
+
+	go func() {
+		defer close(ch)
+
+		ctx, cancel := context.WithTimeout(ctx, checkTimeout)
+		defer cancel()
+
+		if latest, err := check(ctx); err == nil && latest != "" {
+			ch <- latest
+		}
+	}()
+
+	return ch
+}