225 lines
6.1 KiB
Go
225 lines
6.1 KiB
Go
/*
|
|
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package cmd
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"io"
|
|
"path"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/minio/minio/cmd/logger"
|
|
)
|
|
|
|
// listPath will return the requested entries.
|
|
// If no more entries are in the listing io.EOF is returned,
|
|
// otherwise nil or an unexpected error is returned.
|
|
// The listPathOptions given will be checked and modified internally.
|
|
// Required important fields are Bucket, Prefix, Separator.
|
|
// Other important fields are Limit, Marker.
|
|
// List ID always derived from the Marker.
|
|
func (z *erasureServerPools) listPath(ctx context.Context, o listPathOptions) (entries metaCacheEntriesSorted, err error) {
|
|
if err := checkListObjsArgs(ctx, o.Bucket, o.Prefix, o.Marker, z); err != nil {
|
|
return entries, err
|
|
}
|
|
|
|
// Marker is set validate pre-condition.
|
|
if o.Marker != "" && o.Prefix != "" {
|
|
// Marker not common with prefix is not implemented. Send an empty response
|
|
if !HasPrefix(o.Marker, o.Prefix) {
|
|
return entries, io.EOF
|
|
}
|
|
}
|
|
|
|
// With max keys of zero we have reached eof, return right here.
|
|
if o.Limit == 0 {
|
|
return entries, io.EOF
|
|
}
|
|
|
|
// For delimiter and prefix as '/' we do not list anything at all
|
|
// along // with the prefix. On a flat namespace with 'prefix'
|
|
// as '/' we don't have any entries, since all the keys are
|
|
// of form 'keyName/...'
|
|
if strings.HasPrefix(o.Prefix, SlashSeparator) {
|
|
return entries, io.EOF
|
|
}
|
|
|
|
// Over flowing count - reset to maxObjectList.
|
|
if o.Limit < 0 || o.Limit > maxObjectList {
|
|
o.Limit = maxObjectList
|
|
}
|
|
|
|
// If delimiter is slashSeparator we must return directories of
|
|
// the non-recursive scan unless explicitly requested.
|
|
o.IncludeDirectories = o.Separator == slashSeparator
|
|
if (o.Separator == slashSeparator || o.Separator == "") && !o.Recursive {
|
|
o.Recursive = o.Separator != slashSeparator
|
|
o.Separator = slashSeparator
|
|
} else {
|
|
// Default is recursive, if delimiter is set then list non recursive.
|
|
o.Recursive = true
|
|
}
|
|
|
|
// Decode and get the optional list id from the marker.
|
|
o.Marker, o.ID = parseMarker(o.Marker)
|
|
o.Create = o.ID == ""
|
|
if o.ID == "" {
|
|
o.ID = mustGetUUID()
|
|
}
|
|
o.BaseDir = baseDirFromPrefix(o.Prefix)
|
|
if o.discardResult {
|
|
// Override for single object.
|
|
o.BaseDir = o.Prefix
|
|
}
|
|
|
|
// For very small recursive listings, don't same cache.
|
|
// Attempts to avoid expensive listings to run for a long
|
|
// while when clients aren't interested in results.
|
|
// If the client DOES resume the listing a full cache
|
|
// will be generated due to the marker without ID and this check failing.
|
|
if o.Limit < 10 && o.Marker == "" && o.Create && o.Recursive {
|
|
o.discardResult = true
|
|
o.Transient = true
|
|
}
|
|
|
|
var cache metacache
|
|
// If we don't have a list id we must ask the server if it has a cache or create a new.
|
|
if o.Create {
|
|
o.CurrentCycle = intDataUpdateTracker.current()
|
|
o.OldestCycle = globalNotificationSys.findEarliestCleanBloomFilter(ctx, path.Join(o.Bucket, o.BaseDir))
|
|
var cache metacache
|
|
rpc := globalNotificationSys.restClientFromHash(o.Bucket)
|
|
if isReservedOrInvalidBucket(o.Bucket, false) {
|
|
rpc = nil
|
|
o.Transient = true
|
|
}
|
|
// Apply prefix filter if enabled.
|
|
o.SetFilter()
|
|
if rpc == nil || o.Transient {
|
|
// Local
|
|
cache = localMetacacheMgr.findCache(ctx, o)
|
|
} else {
|
|
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
|
|
defer cancel()
|
|
c, err := rpc.GetMetacacheListing(ctx, o)
|
|
if err != nil {
|
|
if errors.Is(err, context.Canceled) {
|
|
// Context is canceled, return at once.
|
|
// request canceled, no entries to return
|
|
return entries, io.EOF
|
|
}
|
|
if !errors.Is(err, context.DeadlineExceeded) {
|
|
logger.LogIf(ctx, err)
|
|
}
|
|
o.Transient = true
|
|
cache = localMetacacheMgr.findCache(ctx, o)
|
|
} else {
|
|
cache = *c
|
|
}
|
|
}
|
|
if cache.fileNotFound {
|
|
// No cache found, no entries found.
|
|
return entries, io.EOF
|
|
}
|
|
// Only create if we created a new.
|
|
o.Create = o.ID == cache.id
|
|
o.ID = cache.id
|
|
}
|
|
|
|
var mu sync.Mutex
|
|
var wg sync.WaitGroup
|
|
var errs []error
|
|
allAtEOF := true
|
|
mu.Lock()
|
|
// Ask all sets and merge entries.
|
|
for _, pool := range z.serverPools {
|
|
for _, set := range pool.sets {
|
|
wg.Add(1)
|
|
go func(i int, set *erasureObjects) {
|
|
defer wg.Done()
|
|
e, err := set.listPath(ctx, o)
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
if err == nil {
|
|
allAtEOF = false
|
|
}
|
|
errs[i] = err
|
|
entries.merge(e, -1)
|
|
|
|
// Resolve non-trivial conflicts
|
|
entries.deduplicate(func(existing, other *metaCacheEntry) (replace bool) {
|
|
if existing.isDir() {
|
|
return false
|
|
}
|
|
eFIV, err := existing.fileInfo(o.Bucket)
|
|
if err != nil {
|
|
return true
|
|
}
|
|
oFIV, err := existing.fileInfo(o.Bucket)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
return oFIV.ModTime.After(eFIV.ModTime)
|
|
})
|
|
if entries.len() > o.Limit {
|
|
allAtEOF = false
|
|
entries.truncate(o.Limit)
|
|
}
|
|
}(len(errs), set)
|
|
errs = append(errs, nil)
|
|
}
|
|
}
|
|
mu.Unlock()
|
|
wg.Wait()
|
|
|
|
if isAllNotFound(errs) {
|
|
// All sets returned not found.
|
|
go func() {
|
|
// Update master cache with that information.
|
|
cache.status = scanStateSuccess
|
|
cache.fileNotFound = true
|
|
o.updateMetacacheListing(cache, globalNotificationSys.restClientFromHash(o.Bucket))
|
|
}()
|
|
// cache returned not found, entries truncated.
|
|
return entries, io.EOF
|
|
}
|
|
|
|
for _, err := range errs {
|
|
if err == nil {
|
|
allAtEOF = false
|
|
continue
|
|
}
|
|
if err.Error() == io.EOF.Error() {
|
|
continue
|
|
}
|
|
logger.LogIf(ctx, err)
|
|
return entries, err
|
|
}
|
|
truncated := entries.len() > o.Limit || !allAtEOF
|
|
entries.truncate(o.Limit)
|
|
if !o.discardResult {
|
|
entries.listID = o.ID
|
|
}
|
|
if !truncated {
|
|
return entries, io.EOF
|
|
}
|
|
return entries, nil
|
|
}
|