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events.go
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events.go
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// Copyright (c) 2022 Proton Technologies AG
//
// This file is part of ProtonMail Bridge.
//
// ProtonMail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ProtonMail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
package store
import (
"encoding/json"
"os"
"sync"
"github.com/pkg/errors"
)
// Events caches the last event IDs for all accounts (there should be only one instance).
type Events struct {
// eventMap is map from userID => key (such as last event) => value (such as event ID).
eventMap map[string]map[string]string
path string
lock *sync.RWMutex
}
// NewEvents constructs a new event cache at the given path.
func NewEvents(path string) *Events {
return &Events{
path: path,
lock: &sync.RWMutex{},
}
}
func (c *Events) getEventID(userID string) string {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.loadEvents(); err != nil {
log.WithError(err).Warn("Problem to load store events")
}
if c.eventMap == nil {
c.eventMap = map[string]map[string]string{}
}
if c.eventMap[userID] == nil {
c.eventMap[userID] = map[string]string{}
}
return c.eventMap[userID]["events"]
}
func (c *Events) setEventID(userID, eventID string) error {
c.lock.Lock()
defer c.lock.Unlock()
if c.eventMap[userID] == nil {
c.eventMap[userID] = map[string]string{}
}
c.eventMap[userID]["events"] = eventID
return c.saveEvents()
}
func (c *Events) loadEvents() error {
if c.eventMap != nil {
return nil
}
f, err := os.Open(c.path)
if os.IsNotExist(err) {
return nil
}
if err != nil {
return err
}
defer f.Close() //nolint[errcheck]
return json.NewDecoder(f).Decode(&c.eventMap)
}
func (c *Events) saveEvents() error {
if c.eventMap == nil {
return errors.New("events: cannot save events: events map is nil")
}
f, err := os.Create(c.path)
if err != nil {
return err
}
defer f.Close() //nolint[errcheck]
return json.NewEncoder(f).Encode(c.eventMap)
}
func (c *Events) clearUserEvents(userID string) error {
c.lock.Lock()
defer c.lock.Unlock()
if c.eventMap == nil {
log.WithField("user", userID).Warning("Cannot clear user events: event map is nil")
return nil
}
log.WithField("user", userID).Trace("Removing user events from event loop")
delete(c.eventMap, userID)
return c.saveEvents()
}