frostfs-node/pkg/local_object_storage/writecache/mode.go

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package writecache
import (
"fmt"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
)
// ErrReadOnly is returned when Put/Write is performed in a read-only mode.
var ErrReadOnly = logicerr.New("write-cache is in read-only mode")
// ErrNotInitialized is returned when write-cache is initializing.
var ErrNotInitialized = logicerr.New("write-cache is not initialized yet")
// SetMode sets write-cache mode of operation.
// When shard is put in read-only mode all objects in memory are flushed to disk
// and all background jobs are suspended.
func (c *cache) SetMode(m mode.Mode) error {
c.modeMtx.Lock()
defer c.modeMtx.Unlock()
return c.setMode(m)
}
// setMode applies new mode. Must be called with cache.modeMtx lock taken.
func (c *cache) setMode(m mode.Mode) error {
var err error
turnOffMeta := m.NoMetabase()
if turnOffMeta && !c.mode.NoMetabase() {
err = c.flush(true)
if err != nil {
return err
}
}
if !c.initialized.Load() {
close(c.stopInitCh)
c.initWG.Wait()
c.stopInitCh = make(chan struct{})
defer func() {
if err == nil && !turnOffMeta {
c.initFlushMarks()
}
}()
}
if c.db != nil {
if err = c.db.Close(); err != nil {
return fmt.Errorf("can't close write-cache database: %w", err)
}
}
// Suspend producers to ensure there are channel send operations in fly.
// flushCh is populated by `flush` with `modeMtx` taken, thus waiting until it is empty
// guarantees that there are no in-fly operations.
for len(c.flushCh) != 0 {
c.log.Info(logs.WritecacheWaitingForChannelsToFlush)
time.Sleep(time.Second)
}
if turnOffMeta {
c.mode = m
return nil
}
if err = c.openStore(m.ReadOnly()); err != nil {
return err
}
c.mode = m
return nil
}
// readOnly returns true if current mode is read-only.
// `c.modeMtx` must be taken.
func (c *cache) readOnly() bool {
return c.mode.ReadOnly()
}