gaspersic/go-ethereum
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

core/rawdb, ethdb: introduce batched/atomic reads from ancients (#23566)

Browse Source 
This PR adds a new accessor method to the freezer database. This new view offers a consistent interface, guaranteeing that all individual tables (headers, bodies etc) are all on the same number, and that this number is not changes (added/truncated) while the operation is performing.
This commit is contained in:
Martin Holst Swende
2021-10-25 16:24:27 +02:00
committed by GitHub
parent 2954f40eac
commit 0e7efd696b
5 changed files with 129 additions and 138 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
core/rawdb/freezer.go
View File

@ -80,8 +80,9 @@ type freezer struct {
frozen uint64 // Number of blocks already frozen
threshold uint64 // Number of recent blocks not to freeze (params.FullImmutabilityThreshold apart from tests)
// This lock synchronizes writers and the truncate operation.
writeLock sync.Mutex
// This lock synchronizes writers and the truncate operation, as well as
// the "atomic" (batched) read operations.
writeLock sync.RWMutex
writeBatch *freezerBatch
readonly bool
@ -201,12 +202,12 @@ func (f *freezer) Ancient(kind string, number uint64) ([]byte, error) {
return nil, errUnknownTable
}
// ReadAncients retrieves multiple items in sequence, starting from the index 'start'.
// AncientRange retrieves multiple items in sequence, starting from the index 'start'.
// It will return
// - at most 'max' items,
// - at least 1 item (even if exceeding the maxByteSize), but will otherwise
// return as many items as fit into maxByteSize.
func (f *freezer) ReadAncients(kind string, start, count, maxBytes uint64) ([][]byte, error) {
func (f *freezer) AncientRange(kind string, start, count, maxBytes uint64) ([][]byte, error) {
if table := f.tables[kind]; table != nil {
return table.RetrieveItems(start, count, maxBytes)
}
@ -222,8 +223,8 @@ func (f *freezer) Ancients() (uint64, error) {
func (f *freezer) AncientSize(kind string) (uint64, error) {
// This needs the write lock to avoid data races on table fields.
// Speed doesn't matter here, AncientSize is for debugging.
f.writeLock.Lock()
defer f.writeLock.Unlock()
f.writeLock.RLock()
defer f.writeLock.RUnlock()
if table := f.tables[kind]; table != nil {
return table.size()
@ -231,6 +232,14 @@ func (f *freezer) AncientSize(kind string) (uint64, error) {
return 0, errUnknownTable
}
// ReadAncients runs the given read operation while ensuring that no writes take place
// on the underlying freezer.
func (f *freezer) ReadAncients(fn func(ethdb.AncientReader) error) (err error) {
f.writeLock.RLock()
defer f.writeLock.RUnlock()
return fn(f)
}
// ModifyAncients runs the given write operation.
func (f *freezer) ModifyAncients(fn func(ethdb.AncientWriteOp) error) (writeSize int64, err error) {
if f.readonly {