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rawdb,ethdb,eth: implement freezer tail deletion and use atomic refer…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| // Copyright 2022 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/> | ||
|
|
||
| package rawdb | ||
|
|
||
| import ( | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/ethereum/go-ethereum/rlp" | ||
| ) | ||
|
|
||
| const freezerVersion = 1 // The initial version tag of freezer table metadata | ||
|
|
||
| // freezerTableMeta wraps all the metadata of the freezer table. | ||
| type freezerTableMeta struct { | ||
| // Version is the versioning descriptor of the freezer table. | ||
| Version uint16 | ||
|
|
||
| // VirtualTail indicates how many items have been marked as deleted. | ||
| // Its value is equal to the number of items removed from the table | ||
| // plus the number of items hidden in the table, so it should never | ||
| // be lower than the "actual tail". | ||
| VirtualTail uint64 | ||
| } | ||
|
|
||
| // newMetadata initializes the metadata object with the given virtual tail. | ||
| func newMetadata(tail uint64) *freezerTableMeta { | ||
| return &freezerTableMeta{ | ||
| Version: freezerVersion, | ||
| VirtualTail: tail, | ||
| } | ||
| } | ||
|
|
||
| // readMetadata reads the metadata of the freezer table from the | ||
| // given metadata file. | ||
| func readMetadata(file *os.File) (*freezerTableMeta, error) { | ||
| _, err := file.Seek(0, io.SeekStart) // SeekStart means the origin of the file | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var meta freezerTableMeta | ||
| if err := rlp.Decode(file, &meta); err != nil { | ||
| return nil, err | ||
| } | ||
| return &meta, nil | ||
| } | ||
|
|
||
| // writeMetadata writes the metadata of the freezer table into the | ||
| // given metadata file. | ||
| func writeMetadata(file *os.File, meta *freezerTableMeta) error { | ||
| _, err := file.Seek(0, io.SeekStart) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return rlp.Encode(file, meta) | ||
| } | ||
|
|
||
| // loadMetadata loads the metadata from the given metadata file. | ||
| // Initializes the metadata file with the given "actual tail" if | ||
| // it's empty. | ||
| func loadMetadata(file *os.File, tail uint64) (*freezerTableMeta, error) { | ||
| stat, err := file.Stat() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Write the metadata with the given actual tail into metadata file | ||
| // if it's non-existent. There are two possible scenarios here: | ||
| // - the freezer table is empty | ||
| // - the freezer table is legacy | ||
| // In both cases, write the meta into the file with the actual tail | ||
| // as the virtual tail. | ||
| if stat.Size() == 0 { // The file is empty | ||
| m := newMetadata(tail) | ||
| if err := writeMetadata(file, m); err != nil { | ||
| return nil, err | ||
| } | ||
| return m, nil | ||
| } | ||
|
|
||
| // If the file is not empty, read the metadata from the file. | ||
| m, err := readMetadata(file) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // Update the virtual tail with the given actual tail if it's even | ||
| // lower than it. Theoretically it shouldn't happen at all, print | ||
| // a warning here. | ||
| if m.VirtualTail < tail { | ||
| log.Warn("Updated virtual tail", "have", m.VirtualTail, "now", tail) | ||
| m.VirtualTail = tail | ||
| if err := writeMetadata(file, m); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return m, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| // Copyright 2022 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/> | ||
|
|
||
| package rawdb | ||
|
|
||
| import ( | ||
| "io/ioutil" | ||
| "os" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestReadWriteFreezerTableMeta(t *testing.T) { | ||
| f, err := ioutil.TempFile(os.TempDir(), "*") | ||
| if err != nil { | ||
| t.Fatalf("Failed to create file %v", err) | ||
| } | ||
| err = writeMetadata(f, newMetadata(100)) | ||
| if err != nil { | ||
| t.Fatalf("Failed to write metadata %v", err) | ||
| } | ||
| meta, err := readMetadata(f) | ||
| if err != nil { | ||
| t.Fatalf("Failed to read metadata %v", err) | ||
| } | ||
| if meta.Version != freezerVersion { | ||
| t.Fatalf("Unexpected version field") | ||
| } | ||
| if meta.VirtualTail != uint64(100) { | ||
| t.Fatalf("Unexpected virtual tail field") | ||
| } | ||
| } | ||
|
|
||
| func TestInitializeFreezerTableMeta(t *testing.T) { | ||
| f, err := ioutil.TempFile(os.TempDir(), "*") | ||
| if err != nil { | ||
| t.Fatalf("Failed to create file %v", err) | ||
| } | ||
| meta, err := loadMetadata(f, uint64(100)) | ||
| if err != nil { | ||
| t.Fatalf("Failed to read metadata %v", err) | ||
| } | ||
| if meta.Version != freezerVersion { | ||
| t.Fatalf("Unexpected version field") | ||
| } | ||
| if meta.VirtualTail != uint64(100) { | ||
| t.Fatalf("Unexpected virtual tail field") | ||
| } | ||
| } |
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