mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
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308 lines
10 KiB
Go
308 lines
10 KiB
Go
// Copyright 2011 The LevelDB-Go and Pebble Authors. All rights reserved. Use
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// of this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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package sstable
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import (
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"bytes"
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"context"
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"encoding/binary"
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"fmt"
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"io"
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"sort"
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"unsafe"
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"github.com/cockroachdb/pebble/internal/base"
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"github.com/cockroachdb/pebble/shims/cmp"
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"github.com/cockroachdb/pebble/shims/slices"
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)
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// Layout describes the block organization of an sstable.
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type Layout struct {
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// NOTE: changes to fields in this struct should also be reflected in
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// ValidateBlockChecksums, which validates a static list of BlockHandles
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// referenced in this struct.
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Data []BlockHandleWithProperties
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Index []BlockHandle
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TopIndex BlockHandle
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Filter BlockHandle
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RangeDel BlockHandle
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RangeKey BlockHandle
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ValueBlock []BlockHandle
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ValueIndex BlockHandle
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Properties BlockHandle
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MetaIndex BlockHandle
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Footer BlockHandle
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Format TableFormat
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}
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// Describe returns a description of the layout. If the verbose parameter is
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// true, details of the structure of each block are returned as well.
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func (l *Layout) Describe(
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w io.Writer, verbose bool, r *Reader, fmtRecord func(key *base.InternalKey, value []byte),
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) {
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ctx := context.TODO()
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type block struct {
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BlockHandle
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name string
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}
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var blocks []block
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for i := range l.Data {
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blocks = append(blocks, block{l.Data[i].BlockHandle, "data"})
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}
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for i := range l.Index {
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blocks = append(blocks, block{l.Index[i], "index"})
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}
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if l.TopIndex.Length != 0 {
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blocks = append(blocks, block{l.TopIndex, "top-index"})
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}
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if l.Filter.Length != 0 {
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blocks = append(blocks, block{l.Filter, "filter"})
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}
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if l.RangeDel.Length != 0 {
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blocks = append(blocks, block{l.RangeDel, "range-del"})
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}
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if l.RangeKey.Length != 0 {
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blocks = append(blocks, block{l.RangeKey, "range-key"})
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}
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for i := range l.ValueBlock {
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blocks = append(blocks, block{l.ValueBlock[i], "value-block"})
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}
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if l.ValueIndex.Length != 0 {
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blocks = append(blocks, block{l.ValueIndex, "value-index"})
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}
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if l.Properties.Length != 0 {
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blocks = append(blocks, block{l.Properties, "properties"})
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}
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if l.MetaIndex.Length != 0 {
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blocks = append(blocks, block{l.MetaIndex, "meta-index"})
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}
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if l.Footer.Length != 0 {
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if l.Footer.Length == levelDBFooterLen {
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blocks = append(blocks, block{l.Footer, "leveldb-footer"})
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} else {
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blocks = append(blocks, block{l.Footer, "footer"})
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}
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}
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slices.SortFunc(blocks, func(a, b block) int {
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return cmp.Compare(a.Offset, b.Offset)
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})
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for i := range blocks {
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b := &blocks[i]
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fmt.Fprintf(w, "%10d %s (%d)\n", b.Offset, b.name, b.Length)
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if !verbose {
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continue
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}
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if b.name == "filter" {
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continue
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}
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if b.name == "footer" || b.name == "leveldb-footer" {
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trailer, offset := make([]byte, b.Length), b.Offset
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_ = r.readable.ReadAt(ctx, trailer, int64(offset))
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if b.name == "footer" {
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checksumType := ChecksumType(trailer[0])
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fmt.Fprintf(w, "%10d checksum type: %s\n", offset, checksumType)
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trailer, offset = trailer[1:], offset+1
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}
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metaHandle, n := binary.Uvarint(trailer)
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metaLen, m := binary.Uvarint(trailer[n:])
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fmt.Fprintf(w, "%10d meta: offset=%d, length=%d\n", offset, metaHandle, metaLen)
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trailer, offset = trailer[n+m:], offset+uint64(n+m)
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indexHandle, n := binary.Uvarint(trailer)
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indexLen, m := binary.Uvarint(trailer[n:])
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fmt.Fprintf(w, "%10d index: offset=%d, length=%d\n", offset, indexHandle, indexLen)
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trailer, offset = trailer[n+m:], offset+uint64(n+m)
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fmt.Fprintf(w, "%10d [padding]\n", offset)
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trailing := 12
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if b.name == "leveldb-footer" {
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trailing = 8
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}
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offset += uint64(len(trailer) - trailing)
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trailer = trailer[len(trailer)-trailing:]
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if b.name == "footer" {
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version := trailer[:4]
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fmt.Fprintf(w, "%10d version: %d\n", offset, binary.LittleEndian.Uint32(version))
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trailer, offset = trailer[4:], offset+4
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}
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magicNumber := trailer
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fmt.Fprintf(w, "%10d magic number: 0x%x\n", offset, magicNumber)
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continue
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}
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h, err := r.readBlock(
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context.Background(), b.BlockHandle, nil /* transform */, nil /* readHandle */, nil /* stats */, nil /* iterStats */, nil /* buffer pool */)
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if err != nil {
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fmt.Fprintf(w, " [err: %s]\n", err)
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continue
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}
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getRestart := func(data []byte, restarts, i int32) int32 {
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return decodeRestart(data[restarts+4*i:])
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}
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formatIsRestart := func(data []byte, restarts, numRestarts, offset int32) {
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i := sort.Search(int(numRestarts), func(i int) bool {
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return getRestart(data, restarts, int32(i)) >= offset
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})
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if i < int(numRestarts) && getRestart(data, restarts, int32(i)) == offset {
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fmt.Fprintf(w, " [restart]\n")
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} else {
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fmt.Fprintf(w, "\n")
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}
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}
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formatRestarts := func(data []byte, restarts, numRestarts int32) {
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for i := int32(0); i < numRestarts; i++ {
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offset := getRestart(data, restarts, i)
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fmt.Fprintf(w, "%10d [restart %d]\n",
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b.Offset+uint64(restarts+4*i), b.Offset+uint64(offset))
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}
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}
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formatTrailer := func() {
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trailer := make([]byte, blockTrailerLen)
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offset := int64(b.Offset + b.Length)
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_ = r.readable.ReadAt(ctx, trailer, offset)
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bt := blockType(trailer[0])
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checksum := binary.LittleEndian.Uint32(trailer[1:])
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fmt.Fprintf(w, "%10d [trailer compression=%s checksum=0x%04x]\n", offset, bt, checksum)
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}
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var lastKey InternalKey
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switch b.name {
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case "data", "range-del", "range-key":
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iter, _ := newBlockIter(r.Compare, h.Get())
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for key, value := iter.First(); key != nil; key, value = iter.Next() {
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ptr := unsafe.Pointer(uintptr(iter.ptr) + uintptr(iter.offset))
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shared, ptr := decodeVarint(ptr)
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unshared, ptr := decodeVarint(ptr)
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value2, _ := decodeVarint(ptr)
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total := iter.nextOffset - iter.offset
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// The format of the numbers in the record line is:
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//
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// (<total> = <length> [<shared>] + <unshared> + <value>)
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//
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// <total> is the total number of bytes for the record.
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// <length> is the size of the 3 varint encoded integers for <shared>,
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// <unshared>, and <value>.
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// <shared> is the number of key bytes shared with the previous key.
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// <unshared> is the number of unshared key bytes.
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// <value> is the number of value bytes.
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fmt.Fprintf(w, "%10d record (%d = %d [%d] + %d + %d)",
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b.Offset+uint64(iter.offset), total,
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total-int32(unshared+value2), shared, unshared, value2)
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formatIsRestart(iter.data, iter.restarts, iter.numRestarts, iter.offset)
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if fmtRecord != nil {
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fmt.Fprintf(w, " ")
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if l.Format < TableFormatPebblev3 {
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fmtRecord(key, value.InPlaceValue())
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} else {
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// InPlaceValue() will succeed even for data blocks where the
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// actual value is in a different location, since this value was
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// fetched from a blockIter which does not know about value
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// blocks.
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v := value.InPlaceValue()
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if base.TrailerKind(key.Trailer) != InternalKeyKindSet {
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fmtRecord(key, v)
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} else if !isValueHandle(valuePrefix(v[0])) {
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fmtRecord(key, v[1:])
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} else {
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vh := decodeValueHandle(v[1:])
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fmtRecord(key, []byte(fmt.Sprintf("value handle %+v", vh)))
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}
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}
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}
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if base.InternalCompare(r.Compare, lastKey, *key) >= 0 {
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fmt.Fprintf(w, " WARNING: OUT OF ORDER KEYS!\n")
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}
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lastKey.Trailer = key.Trailer
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lastKey.UserKey = append(lastKey.UserKey[:0], key.UserKey...)
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}
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formatRestarts(iter.data, iter.restarts, iter.numRestarts)
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formatTrailer()
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case "index", "top-index":
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iter, _ := newBlockIter(r.Compare, h.Get())
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for key, value := iter.First(); key != nil; key, value = iter.Next() {
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bh, err := decodeBlockHandleWithProperties(value.InPlaceValue())
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if err != nil {
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fmt.Fprintf(w, "%10d [err: %s]\n", b.Offset+uint64(iter.offset), err)
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continue
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}
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fmt.Fprintf(w, "%10d block:%d/%d",
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b.Offset+uint64(iter.offset), bh.Offset, bh.Length)
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formatIsRestart(iter.data, iter.restarts, iter.numRestarts, iter.offset)
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}
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formatRestarts(iter.data, iter.restarts, iter.numRestarts)
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formatTrailer()
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case "properties":
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iter, _ := newRawBlockIter(r.Compare, h.Get())
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for valid := iter.First(); valid; valid = iter.Next() {
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fmt.Fprintf(w, "%10d %s (%d)",
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b.Offset+uint64(iter.offset), iter.Key().UserKey, iter.nextOffset-iter.offset)
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formatIsRestart(iter.data, iter.restarts, iter.numRestarts, iter.offset)
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}
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formatRestarts(iter.data, iter.restarts, iter.numRestarts)
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formatTrailer()
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case "meta-index":
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iter, _ := newRawBlockIter(r.Compare, h.Get())
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for valid := iter.First(); valid; valid = iter.Next() {
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value := iter.Value()
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var bh BlockHandle
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var n int
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var vbih valueBlocksIndexHandle
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isValueBlocksIndexHandle := false
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if bytes.Equal(iter.Key().UserKey, []byte(metaValueIndexName)) {
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vbih, n, err = decodeValueBlocksIndexHandle(value)
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bh = vbih.h
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isValueBlocksIndexHandle = true
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} else {
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bh, n = decodeBlockHandle(value)
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}
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if n == 0 || n != len(value) {
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fmt.Fprintf(w, "%10d [err: %s]\n", b.Offset+uint64(iter.offset), err)
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continue
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}
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var vbihStr string
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if isValueBlocksIndexHandle {
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vbihStr = fmt.Sprintf(" value-blocks-index-lengths: %d(num), %d(offset), %d(length)",
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vbih.blockNumByteLength, vbih.blockOffsetByteLength, vbih.blockLengthByteLength)
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}
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fmt.Fprintf(w, "%10d %s block:%d/%d%s",
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b.Offset+uint64(iter.offset), iter.Key().UserKey,
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bh.Offset, bh.Length, vbihStr)
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formatIsRestart(iter.data, iter.restarts, iter.numRestarts, iter.offset)
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}
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formatRestarts(iter.data, iter.restarts, iter.numRestarts)
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formatTrailer()
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case "value-block":
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// We don't peer into the value-block since it can't be interpreted
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// without the valueHandles.
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case "value-index":
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// We have already read the value-index to construct the list of
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// value-blocks, so no need to do it again.
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}
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h.Release()
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}
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last := blocks[len(blocks)-1]
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fmt.Fprintf(w, "%10d EOF\n", last.Offset+last.Length)
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}
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