forked from Silverfish/proton-bridge
117 lines
2.6 KiB
Go
117 lines
2.6 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package store
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import (
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"encoding/json"
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"os"
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"sync"
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"github.com/pkg/errors"
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)
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// Cache caches the last event IDs for all accounts (there should be only one instance).
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type Cache struct {
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// cache is map from userID => key (such as last event) => value (such as event ID).
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cache map[string]map[string]string
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path string
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lock *sync.RWMutex
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}
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// NewCache constructs a new cache at the given path.
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func NewCache(path string) *Cache {
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return &Cache{
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path: path,
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lock: &sync.RWMutex{},
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}
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}
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func (c *Cache) getEventID(userID string) string {
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c.lock.Lock()
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defer c.lock.Unlock()
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if err := c.loadCache(); err != nil {
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log.WithError(err).Warn("Problem to load store cache")
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}
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if c.cache == nil {
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c.cache = map[string]map[string]string{}
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}
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if c.cache[userID] == nil {
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c.cache[userID] = map[string]string{}
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}
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return c.cache[userID]["events"]
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}
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func (c *Cache) setEventID(userID, eventID string) error {
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c.lock.Lock()
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defer c.lock.Unlock()
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if c.cache[userID] == nil {
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c.cache[userID] = map[string]string{}
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}
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c.cache[userID]["events"] = eventID
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return c.saveCache()
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}
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func (c *Cache) loadCache() error {
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if c.cache != nil {
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return nil
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}
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f, err := os.Open(c.path)
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if err != nil {
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return err
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}
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defer f.Close() //nolint[errcheck]
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return json.NewDecoder(f).Decode(&c.cache)
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}
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func (c *Cache) saveCache() error {
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if c.cache == nil {
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return errors.New("events: cannot save cache: cache is nil")
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}
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f, err := os.Create(c.path)
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if err != nil {
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return err
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}
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defer f.Close() //nolint[errcheck]
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return json.NewEncoder(f).Encode(c.cache)
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}
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func (c *Cache) clearCacheUser(userID string) error {
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c.lock.Lock()
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defer c.lock.Unlock()
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if c.cache == nil {
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log.WithField("user", userID).Warning("Cannot clear user from cache: cache is nil")
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return nil
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}
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log.WithField("user", userID).Trace("Removing user from event loop cache")
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delete(c.cache, userID)
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return c.saveCache()
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}
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