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[#1462] fstree: Allow to fetch file content lazily

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If we should process address based on some condition, there is no need
to read file content in memory.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgenii Stratonikov 2022-05-31 17:11:48 +03:00 committed by LeL
parent 54d4503701
commit f2a7503964
3 changed files with 37 additions and 9 deletions
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21
pkg/local_object_storage/blobstor/fstree/fstree.go
View file

@ -72,6 +72,7 @@ func addressFromString(s string) (*oid.Address, error) {
type IterationPrm struct {
handler func(addr oid.Address, data []byte) error
ignoreErrors bool
lazyHandler func(oid.Address, func() ([]byte, error)) error
}
// WithHandler sets a function to call on each object.
@ -79,6 +80,13 @@ func (p *IterationPrm) WithHandler(f func(addr oid.Address, data []byte) error)
p.handler = f
}
// WithLazyHandler sets a function to call on each object.
// Second callback parameter opens file and reads all data to a buffer.
// File is not opened at all unless this callback is invoked.
func (p *IterationPrm) WithLazyHandler(f func(oid.Address, func() ([]byte, error)) error) {
p.lazyHandler = f
}
// WithIgnoreErrors sets a flag indicating whether errors should be ignored.
func (p *IterationPrm) WithIgnoreErrors(ignore bool) {
p.ignoreErrors = ignore
@ -124,16 +132,23 @@ func (t *FSTree) iterate(depth int, curPath []string, prm IterationPrm) error {
continue
}
data, err := os.ReadFile(filepath.Join(curPath...))
if prm.lazyHandler != nil {
err = prm.lazyHandler(*addr, func() ([]byte, error) {
return os.ReadFile(filepath.Join(curPath...))
})
} else {
var data []byte
data, err = os.ReadFile(filepath.Join(curPath...))
if err != nil {
if prm.ignoreErrors {
continue
}
return err
}
err = prm.handler(*addr, data)
}
if err := prm.handler(*addr, data); err != nil {
// Error occurred in handler, outside of our scope, needs to be reported.
if err != nil {
return err
}
}

8
pkg/local_object_storage/writecache/flush.go
View file

@ -138,13 +138,19 @@ func (c *cache) flushBigObjects() {
evictNum := 0
var prm fstree.IterationPrm
prm.WithHandler(func(addr oid.Address, data []byte) error {
prm.WithLazyHandler(func(addr oid.Address, f func() ([]byte, error)) error {
sAddr := addr.EncodeToString()
if _, ok := c.store.flushed.Peek(sAddr); ok {
return nil
}
data, err := f()
if err != nil {
c.log.Error("can't read a file", zap.Stringer("address", addr))
return nil
}
c.mtx.Lock()
_, compress := c.compressFlags[sAddr]
c.mtx.Unlock()

9
pkg/local_object_storage/writecache/iterate.go
View file

@ -53,10 +53,17 @@ func (c *cache) Iterate(prm IterationPrm) error {
var fsPrm fstree.IterationPrm
fsPrm.WithIgnoreErrors(prm.ignoreErrors)
fsPrm.WithHandler(func(addr oid.Address, data []byte) error {
fsPrm.WithLazyHandler(func(addr oid.Address, f func() ([]byte, error)) error {
if _, ok := c.flushed.Peek(addr.EncodeToString()); ok {
return nil
}
data, err := f()
if err != nil {
if prm.ignoreErrors {
return nil
}
return err
}
return prm.handler(data)
})