67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
package cache
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import (
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"encoding/json"
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"fmt"
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"log/slog"
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"os"
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"path"
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"dario.cat/mergo"
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"go.xsfx.dev/glucose_exporter/internal/config"
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"go.xsfx.dev/glucose_exporter/internal/epoch"
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)
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const cacheFile = "cache.json"
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type Cache struct {
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JWT string `json:"jwt,omitempty"`
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Expires epoch.Epoch `json:"expires,omitempty"`
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BaseURL string `json:"base_url,omitempty"`
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}
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func FullPath() string {
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return path.Join(config.Cfg.CacheDir, cacheFile)
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}
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func Load() (Cache, error) {
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var c Cache
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slog.Debug("reading cache", "file", FullPath())
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b, err := os.ReadFile(FullPath())
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if err != nil {
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return Cache{}, fmt.Errorf("reading cache file: %w", err)
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}
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if err := json.Unmarshal(b, &c); err != nil {
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return Cache{}, fmt.Errorf("unmarshal cache: %w", err)
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}
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return c, nil
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}
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func Save(c Cache) error {
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slog.Debug("writing cache", "file", FullPath())
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s, err := Load()
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if err != nil {
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return fmt.Errorf("loading cache: %w", err)
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}
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if err := mergo.Merge(&s, c, mergo.WithOverride); err != nil {
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return fmt.Errorf("merging cache: %w", err)
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}
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b, err := json.MarshalIndent(s, "", " ")
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if err != nil {
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return fmt.Errorf("marshalling cache: %w", err)
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}
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if err := os.WriteFile(FullPath(), b, 0o600); err != nil {
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return fmt.Errorf("writing cache file: %w", err)
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}
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return nil
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}
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