domi/forgejo-domi
1
0
Fork 0
forked from forgejo/forgejo
Code Pull requests Activity

Simply remove tidb and deps (#3993)

Browse source
This commit is contained in:
Antoine GIRARD 2018-07-04 22:23:23 +02:00 • committed by techknowlogick
parent 2e3475f02c
commit 74f9f98f78
397 changed files with 1 additions and 166391 deletions
Download patch file Download diff file Expand all files Collapse all files

1107
vendor/github.com/syndtr/goleveldb/leveldb/table/reader.go generated vendored
View file

File diff suppressed because it is too large Load diff

177
vendor/github.com/syndtr/goleveldb/leveldb/table/table.go generated vendored
View file

@ -1,177 +0,0 @@
// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Package table allows read and write sorted key/value.
package table
import (
"encoding/binary"
)
/*
Table:
Table is consist of one or more data blocks, an optional filter block
a metaindex block, an index block and a table footer. Metaindex block
is a special block used to keep parameters of the table, such as filter
block name and its block handle. Index block is a special block used to
keep record of data blocks offset and length, index block use one as
restart interval. The key used by index block are the last key of preceding
block, shorter separator of adjacent blocks or shorter successor of the
last key of the last block. Filter block is an optional block contains
sequence of filter data generated by a filter generator.
Table data structure:
+ optional
/
+--------------+--------------+--------------+------+-------+-----------------+-------------+--------+
| data block 1 | ... | data block n | filter block | metaindex block | index block | footer |
+--------------+--------------+--------------+--------------+-----------------+-------------+--------+
Each block followed by a 5-bytes trailer contains compression type and checksum.
Table block trailer:
+---------------------------+-------------------+
| compression type (1-byte) | checksum (4-byte) |
+---------------------------+-------------------+
The checksum is a CRC-32 computed using Castagnoli's polynomial. Compression
type also included in the checksum.
Table footer:
+------------------- 40-bytes -------------------+
/ \
+------------------------+--------------------+------+-----------------+
| metaindex block handle / index block handle / ---- | magic (8-bytes) |
+------------------------+--------------------+------+-----------------+
The magic are first 64-bit of SHA-1 sum of "http://code.google.com/p/leveldb/".
NOTE: All fixed-length integer are little-endian.
*/
/*
Block:
Block is consist of one or more key/value entries and a block trailer.
Block entry shares key prefix with its preceding key until a restart
point reached. A block should contains at least one restart point.
First restart point are always zero.
Block data structure:
+ restart point + restart point (depends on restart interval)
/ /
+---------------+---------------+---------------+---------------+---------+
| block entry 1 | block entry 2 | ... | block entry n | trailer |
+---------------+---------------+---------------+---------------+---------+
Key/value entry:
+---- key len ----+
/ \
+-------+---------+-----------+---------+--------------------+--------------+----------------+
| shared (varint) | not shared (varint) | value len (varint) | key (varlen) | value (varlen) |
+-----------------+---------------------+--------------------+--------------+----------------+
Block entry shares key prefix with its preceding key:
Conditions:
restart_interval=2
entry one : key=deck,value=v1
entry two : key=dock,value=v2
entry three: key=duck,value=v3
The entries will be encoded as follow:
+ restart point (offset=0) + restart point (offset=16)
/ /
+-----+-----+-----+----------+--------+-----+-----+-----+---------+--------+-----+-----+-----+----------+--------+
| 0 | 4 | 2 | "deck" | "v1" | 1 | 3 | 2 | "ock" | "v2" | 0 | 4 | 2 | "duck" | "v3" |
+-----+-----+-----+----------+--------+-----+-----+-----+---------+--------+-----+-----+-----+----------+--------+
\ / \ / \ /
+----------- entry one -----------+ +----------- entry two ----------+ +---------- entry three ----------+
The block trailer will contains two restart points:
+------------+-----------+--------+
| 0 | 16 | 2 |
+------------+-----------+---+----+
\ / \
+-- restart points --+ + restart points length
Block trailer:
+-- 4-bytes --+
/ \
+-----------------+-----------------+-----------------+------------------------------+
| restart point 1 | .... | restart point n | restart points len (4-bytes) |
+-----------------+-----------------+-----------------+------------------------------+
NOTE: All fixed-length integer are little-endian.
*/
/*
Filter block:
Filter block consist of one or more filter data and a filter block trailer.
The trailer contains filter data offsets, a trailer offset and a 1-byte base Lg.
Filter block data structure:
+ offset 1 + offset 2 + offset n + trailer offset
/ / / /
+---------------+---------------+---------------+---------+
| filter data 1 | ... | filter data n | trailer |
+---------------+---------------+---------------+---------+
Filter block trailer:
+- 4-bytes -+
/ \
+---------------+---------------+---------------+-------------------------------+------------------+
| data 1 offset | .... | data n offset | data-offsets offset (4-bytes) | base Lg (1-byte) |
+-------------- +---------------+---------------+-------------------------------+------------------+
NOTE: All fixed-length integer are little-endian.
*/
const (
blockTrailerLen = 5
footerLen = 48
magic = "\x57\xfb\x80\x8b\x24\x75\x47\xdb"
// The block type gives the per-block compression format.
// These constants are part of the file format and should not be changed.
blockTypeNoCompression = 0
blockTypeSnappyCompression = 1
// Generate new filter every 2KB of data
filterBaseLg = 11
filterBase = 1 << filterBaseLg
)
type blockHandle struct {
offset, length uint64
}
func decodeBlockHandle(src []byte) (blockHandle, int) {
offset, n := binary.Uvarint(src)
length, m := binary.Uvarint(src[n:])
if n == 0 || m == 0 {
return blockHandle{}, 0
}
return blockHandle{offset, length}, n + m
}
func encodeBlockHandle(dst []byte, b blockHandle) int {
n := binary.PutUvarint(dst, b.offset)
m := binary.PutUvarint(dst[n:], b.length)
return n + m
}

375
vendor/github.com/syndtr/goleveldb/leveldb/table/writer.go generated vendored
View file

@ -1,375 +0,0 @@
// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package table
import (
"encoding/binary"
"errors"
"fmt"
"io"
"github.com/golang/snappy"
"github.com/syndtr/goleveldb/leveldb/comparer"
"github.com/syndtr/goleveldb/leveldb/filter"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/util"
)
func sharedPrefixLen(a, b []byte) int {
i, n := 0, len(a)
if n > len(b) {
n = len(b)
}
for i < n && a[i] == b[i] {
i++
}
return i
}
type blockWriter struct {
restartInterval int
buf util.Buffer
nEntries int
prevKey []byte
restarts []uint32
scratch []byte
}
func (w *blockWriter) append(key, value []byte) {
nShared := 0
if w.nEntries%w.restartInterval == 0 {
w.restarts = append(w.restarts, uint32(w.buf.Len()))
} else {
nShared = sharedPrefixLen(w.prevKey, key)
}
n := binary.PutUvarint(w.scratch[0:], uint64(nShared))
n += binary.PutUvarint(w.scratch[n:], uint64(len(key)-nShared))
n += binary.PutUvarint(w.scratch[n:], uint64(len(value)))
w.buf.Write(w.scratch[:n])
w.buf.Write(key[nShared:])
w.buf.Write(value)
w.prevKey = append(w.prevKey[:0], key...)
w.nEntries++
}
func (w *blockWriter) finish() {
// Write restarts entry.
if w.nEntries == 0 {
// Must have at least one restart entry.
w.restarts = append(w.restarts, 0)
}
w.restarts = append(w.restarts, uint32(len(w.restarts)))
for _, x := range w.restarts {
buf4 := w.buf.Alloc(4)
binary.LittleEndian.PutUint32(buf4, x)
}
}
func (w *blockWriter) reset() {
w.buf.Reset()
w.nEntries = 0
w.restarts = w.restarts[:0]
}
func (w *blockWriter) bytesLen() int {
restartsLen := len(w.restarts)
if restartsLen == 0 {
restartsLen = 1
}
return w.buf.Len() + 4*restartsLen + 4
}
type filterWriter struct {
generator filter.FilterGenerator
buf util.Buffer
nKeys int
offsets []uint32
}
func (w *filterWriter) add(key []byte) {
if w.generator == nil {
return
}
w.generator.Add(key)
w.nKeys++
}
func (w *filterWriter) flush(offset uint64) {
if w.generator == nil {
return
}
for x := int(offset / filterBase); x > len(w.offsets); {
w.generate()
}
}
func (w *filterWriter) finish() {
if w.generator == nil {
return
}
// Generate last keys.
if w.nKeys > 0 {
w.generate()
}
w.offsets = append(w.offsets, uint32(w.buf.Len()))
for _, x := range w.offsets {
buf4 := w.buf.Alloc(4)
binary.LittleEndian.PutUint32(buf4, x)
}
w.buf.WriteByte(filterBaseLg)
}
func (w *filterWriter) generate() {
// Record offset.
w.offsets = append(w.offsets, uint32(w.buf.Len()))
// Generate filters.
if w.nKeys > 0 {
w.generator.Generate(&w.buf)
w.nKeys = 0
}
}
// Writer is a table writer.
type Writer struct {
writer io.Writer
err error
// Options
cmp comparer.Comparer
filter filter.Filter
compression opt.Compression
blockSize int
dataBlock blockWriter
indexBlock blockWriter
filterBlock filterWriter
pendingBH blockHandle
offset uint64
nEntries int
// Scratch allocated enough for 5 uvarint. Block writer should not use
// first 20-bytes since it will be used to encode block handle, which
// then passed to the block writer itself.
scratch [50]byte
comparerScratch []byte
compressionScratch []byte
}
func (w *Writer) writeBlock(buf *util.Buffer, compression opt.Compression) (bh blockHandle, err error) {
// Compress the buffer if necessary.
var b []byte
if compression == opt.SnappyCompression {
// Allocate scratch enough for compression and block trailer.
if n := snappy.MaxEncodedLen(buf.Len()) + blockTrailerLen; len(w.compressionScratch) < n {
w.compressionScratch = make([]byte, n)
}
compressed := snappy.Encode(w.compressionScratch, buf.Bytes())
n := len(compressed)
b = compressed[:n+blockTrailerLen]
b[n] = blockTypeSnappyCompression
} else {
tmp := buf.Alloc(blockTrailerLen)
tmp[0] = blockTypeNoCompression
b = buf.Bytes()
}
// Calculate the checksum.
n := len(b) - 4
checksum := util.NewCRC(b[:n]).Value()
binary.LittleEndian.PutUint32(b[n:], checksum)
// Write the buffer to the file.
_, err = w.writer.Write(b)
if err != nil {
return
}
bh = blockHandle{w.offset, uint64(len(b) - blockTrailerLen)}
w.offset += uint64(len(b))
return
}
func (w *Writer) flushPendingBH(key []byte) {
if w.pendingBH.length == 0 {
return
}
var separator []byte
if len(key) == 0 {
separator = w.cmp.Successor(w.comparerScratch[:0], w.dataBlock.prevKey)
} else {
separator = w.cmp.Separator(w.comparerScratch[:0], w.dataBlock.prevKey, key)
}
if separator == nil {
separator = w.dataBlock.prevKey
} else {
w.comparerScratch = separator
}
n := encodeBlockHandle(w.scratch[:20], w.pendingBH)
// Append the block handle to the index block.
w.indexBlock.append(separator, w.scratch[:n])
// Reset prev key of the data block.
w.dataBlock.prevKey = w.dataBlock.prevKey[:0]
// Clear pending block handle.
w.pendingBH = blockHandle{}
}
func (w *Writer) finishBlock() error {
w.dataBlock.finish()
bh, err := w.writeBlock(&w.dataBlock.buf, w.compression)
if err != nil {
return err
}
w.pendingBH = bh
// Reset the data block.
w.dataBlock.reset()
// Flush the filter block.
w.filterBlock.flush(w.offset)
return nil
}
// Append appends key/value pair to the table. The keys passed must
// be in increasing order.
//
// It is safe to modify the contents of the arguments after Append returns.
func (w *Writer) Append(key, value []byte) error {
if w.err != nil {
return w.err
}
if w.nEntries > 0 && w.cmp.Compare(w.dataBlock.prevKey, key) >= 0 {
w.err = fmt.Errorf("leveldb/table: Writer: keys are not in increasing order: %q, %q", w.dataBlock.prevKey, key)
return w.err
}
w.flushPendingBH(key)
// Append key/value pair to the data block.
w.dataBlock.append(key, value)
// Add key to the filter block.
w.filterBlock.add(key)
// Finish the data block if block size target reached.
if w.dataBlock.bytesLen() >= w.blockSize {
if err := w.finishBlock(); err != nil {
w.err = err
return w.err
}
}
w.nEntries++
return nil
}
// BlocksLen returns number of blocks written so far.
func (w *Writer) BlocksLen() int {
n := w.indexBlock.nEntries
if w.pendingBH.length > 0 {
// Includes the pending block.
n++
}
return n
}
// EntriesLen returns number of entries added so far.
func (w *Writer) EntriesLen() int {
return w.nEntries
}
// BytesLen returns number of bytes written so far.
func (w *Writer) BytesLen() int {
return int(w.offset)
}
// Close will finalize the table. Calling Append is not possible
// after Close, but calling BlocksLen, EntriesLen and BytesLen
// is still possible.
func (w *Writer) Close() error {
if w.err != nil {
return w.err
}
// Write the last data block. Or empty data block if there
// aren't any data blocks at all.
if w.dataBlock.nEntries > 0 || w.nEntries == 0 {
if err := w.finishBlock(); err != nil {
w.err = err
return w.err
}
}
w.flushPendingBH(nil)
// Write the filter block.
var filterBH blockHandle
w.filterBlock.finish()
if buf := &w.filterBlock.buf; buf.Len() > 0 {
filterBH, w.err = w.writeBlock(buf, opt.NoCompression)
if w.err != nil {
return w.err
}
}
// Write the metaindex block.
if filterBH.length > 0 {
key := []byte("filter." + w.filter.Name())
n := encodeBlockHandle(w.scratch[:20], filterBH)
w.dataBlock.append(key, w.scratch[:n])
}
w.dataBlock.finish()
metaindexBH, err := w.writeBlock(&w.dataBlock.buf, w.compression)
if err != nil {
w.err = err
return w.err
}
// Write the index block.
w.indexBlock.finish()
indexBH, err := w.writeBlock(&w.indexBlock.buf, w.compression)
if err != nil {
w.err = err
return w.err
}
// Write the table footer.
footer := w.scratch[:footerLen]
for i := range footer {
footer[i] = 0
}
n := encodeBlockHandle(footer, metaindexBH)
encodeBlockHandle(footer[n:], indexBH)
copy(footer[footerLen-len(magic):], magic)
if _, err := w.writer.Write(footer); err != nil {
w.err = err
return w.err
}
w.offset += footerLen
w.err = errors.New("leveldb/table: writer is closed")
return nil
}
// NewWriter creates a new initialized table writer for the file.
//
// Table writer is not goroutine-safe.
func NewWriter(f io.Writer, o *opt.Options) *Writer {
w := &Writer{
writer: f,
cmp: o.GetComparer(),
filter: o.GetFilter(),
compression: o.GetCompression(),
blockSize: o.GetBlockSize(),
comparerScratch: make([]byte, 0),
}
// data block
w.dataBlock.restartInterval = o.GetBlockRestartInterval()
// The first 20-bytes are used for encoding block handle.
w.dataBlock.scratch = w.scratch[20:]
// index block
w.indexBlock.restartInterval = 1
w.indexBlock.scratch = w.scratch[20:]
// filter block
if w.filter != nil {
w.filterBlock.generator = w.filter.NewGenerator()
w.filterBlock.flush(0)
}
return w
}