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// Copyright (C) 2021 nytpu
// SPDX-License-Identifier: AGPL-3.0-or-later
// For more license details, see LICENSE or <https://www.gnu.org/licenses/agpl-3.0.html>.
// This file incorporates code from makeworld's amfora:
// https://github.com/makeworld-the-better-one/amfora/blob/master/subscriptions/structs.go
// Original source is Copyright 2020 makeworld and is licensed under the
// terms of the GNU General Public License Version 3.0.
// https://www.gnu.org/licenses/gpl-3.0-standalone.html
// package core implements the structs and other necessary resources for storing
// and managing feeds and pages
package core
import (
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"sync"
)
// Global instance of FullData
var Data = FullData{
FeedsMu: &sync.RWMutex{},
PagesMu: &sync.RWMutex{},
// Maps are created in init()
}
// have to do this instead of the automatically called init() because
// initialization stuff requires parsing of command line args first
func Init(dataPath string) error {
f, err := os.Open(filepath.Join(dataPath, "comitium.json"))
if err == nil {
// File exists and could be opened
fi, err := f.Stat()
if err == nil && fi.Size() > 0 {
// File is not empty
jsonBytes, err := io.ReadAll(f)
f.Close()
if err != nil {
return fmt.Errorf("read comitium.json error: %w", err)
}
err = json.Unmarshal(jsonBytes, &Data)
if err != nil {
return fmt.Errorf("comitium.json is corrupted: %w", err)
}
}
f.Close()
} else if !os.IsNotExist(err) {
// There's an error opening the file, but it's not bc is doesn't exist
return fmt.Errorf("open comitium.json error: %w", err)
}
if Data.Feeds == nil {
Data.Feeds = make(map[string]*Feed)
}
if Data.Pages == nil {
Data.Pages = make(map[string]*Page)
}
return nil
}
func (d *FullData) WriteJSON(dataPath string) error {
// use .new so if there's a corruption when writing the old file is intact
path := filepath.Join(dataPath, "comitium.json.new")
d.RLock()
jsonBytes, err := json.MarshalIndent(&d, "", "\t")
d.RUnlock()
if err != nil {
return err
}
err = os.WriteFile(path, jsonBytes, 0666)
if err != nil {
return err
}
// if full write was successful then overwrite original
err = os.Rename(path, filepath.Join(dataPath, "comitium.json"))
return err
}
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