63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
package geodata
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import (
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"time"
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)
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const cacheDuration = 30 * 24 * time.Hour
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func getCachePath() string {
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home, _ := os.UserHomeDir()
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return filepath.Join(home, ".cache", "git-chronos", "geodata.json")
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}
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func loadFromCache() (TimezoneMap, error) {
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path := getCachePath()
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file, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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var cacheContainer cacheCountryData
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if err := json.NewDecoder(file).Decode(&cacheContainer); err != nil {
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return nil, err
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}
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if time.Since(cacheContainer.FetchedAt) > cacheDuration {
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return nil, fmt.Errorf("cache expired")
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}
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return cacheContainer.Data, nil
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}
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func saveToCache(tzMap TimezoneMap) error {
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path := getCachePath()
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dir := filepath.Dir(path)
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if err := os.MkdirAll(dir, 755); err != nil { // creates if not exists
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return fmt.Errorf("failed to create cache dir")
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}
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file, err := os.Create(path) // create if not exists
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if err != nil {
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return err
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}
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defer file.Close()
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container := cacheCountryData{
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FetchedAt: time.Now(),
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Data: tzMap,
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}
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encoder := json.NewEncoder(file)
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encoder.SetIndent("", " ") // so it looks better
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return encoder.Encode(container)
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}
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