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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package sitesettings | ||
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| import ( | ||
| "context" | ||
| "database/sql" | ||
| "encoding/json" | ||
| "fmt" | ||
| "sync" | ||
| ) | ||
|
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| var cache = &ssCache{} | ||
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| // SiteSettings are distinct from config.Config. SiteSettings are those settings | ||
| // that can be changed on the fly (while everything is running) from the admin | ||
| // dashboard. | ||
| type SiteSettings struct { | ||
| SignupsDisabled bool `json:"signupsDisabled"` | ||
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| // note: ssCache.store() and ssCache.get() uses shallow-copy on this struct. | ||
| // So those lines of code need updating if pointer fields are added to this | ||
| // struct. | ||
| } | ||
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| // Save persists s to the database. | ||
| func (s *SiteSettings) Save(ctx context.Context, db *sql.DB) error { | ||
| defer cache.bust() | ||
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| bytes, err := json.Marshal(s) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| _, err = db.ExecContext(ctx, "INSERT INTO application_data (`key`, `value`) VALUES (?, ?) ON DUPLICATE KEY UPDATE `value` = ?", "site_settings", string(bytes), string(bytes)) | ||
| return err | ||
| } | ||
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| type ssCache struct { | ||
| mu sync.Mutex // guards following | ||
| settings *SiteSettings // cache value | ||
| } | ||
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| func (c *ssCache) get() *SiteSettings { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
| if c.settings != nil { | ||
| cp := &SiteSettings{} | ||
| *cp = *c.settings // shallow copy | ||
| return cp | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (c *ssCache) store(s *SiteSettings) { | ||
| c.mu.Lock() | ||
| cp := &SiteSettings{} | ||
| *cp = *s // shallow copy | ||
| c.settings = cp | ||
| c.mu.Unlock() | ||
| } | ||
|
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| func (c *ssCache) bust() { | ||
| c.mu.Lock() | ||
| c.settings = nil | ||
| c.mu.Unlock() | ||
| } | ||
|
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| // GetSiteSettings retrieves the site settings (of the admin dashboard) from the | ||
| // database. If the data is not found in the database (as the case may be if | ||
| // they were never altered), then the default settings object is returned. | ||
| func GetSiteSettings(ctx context.Context, db *sql.DB) (*SiteSettings, error) { | ||
| if settings := cache.get(); settings != nil { | ||
| return settings, nil | ||
| } | ||
|
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| var jsonText string | ||
| err := db.QueryRowContext(ctx, "SELECT `value` FROM application_data WHERE `key` = ?", "site_settings").Scan(&jsonText) | ||
| if err != nil { | ||
| if err != sql.ErrNoRows { | ||
| return nil, fmt.Errorf("error reading site_settings from db: %w", err) | ||
| } | ||
| } | ||
|
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| settings := &SiteSettings{} | ||
| if jsonText == "" { | ||
| // Do nothhing. No row was found in the application_data table. Return | ||
| // the deafult SiteSettings object. | ||
| } else { | ||
| if err = json.Unmarshal([]byte(jsonText), settings); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
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| cache.store(settings) | ||
| return settings, nil | ||
| } |
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