mirror of https://github.com/poanetwork/quorum.git
395 lines
9.1 KiB
Go
395 lines
9.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package storage
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import (
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"bytes"
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"context"
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"crypto"
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"hash"
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"io"
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"io/ioutil"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto/sha3"
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"github.com/ethereum/go-ethereum/swarm/bmt"
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ch "github.com/ethereum/go-ethereum/swarm/chunk"
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)
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const MaxPO = 16
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const AddressLength = 32
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type Hasher func() hash.Hash
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type SwarmHasher func() SwarmHash
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// Peer is the recorded as Source on the chunk
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// should probably not be here? but network should wrap chunk object
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type Peer interface{}
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type Address []byte
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func (a Address) Size() uint {
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return uint(len(a))
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}
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func (a Address) isEqual(y Address) bool {
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return bytes.Equal(a, y)
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}
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func (a Address) bits(i, j uint) uint {
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ii := i >> 3
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jj := i & 7
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if ii >= a.Size() {
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return 0
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}
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if jj+j <= 8 {
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return uint((a[ii] >> jj) & ((1 << j) - 1))
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}
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res := uint(a[ii] >> jj)
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jj = 8 - jj
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j -= jj
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for j != 0 {
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ii++
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if j < 8 {
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res += uint(a[ii]&((1<<j)-1)) << jj
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return res
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}
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res += uint(a[ii]) << jj
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jj += 8
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j -= 8
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}
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return res
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}
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func Proximity(one, other []byte) (ret int) {
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b := (MaxPO-1)/8 + 1
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if b > len(one) {
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b = len(one)
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}
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m := 8
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for i := 0; i < b; i++ {
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oxo := one[i] ^ other[i]
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if i == b-1 {
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m = MaxPO % 8
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}
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for j := 0; j < m; j++ {
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if (oxo>>uint8(7-j))&0x01 != 0 {
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return i*8 + j
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}
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}
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}
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return MaxPO
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}
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func IsZeroAddr(addr Address) bool {
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return len(addr) == 0 || bytes.Equal(addr, ZeroAddr)
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}
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var ZeroAddr = Address(common.Hash{}.Bytes())
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func MakeHashFunc(hash string) SwarmHasher {
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switch hash {
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case "SHA256":
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return func() SwarmHash { return &HashWithLength{crypto.SHA256.New()} }
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case "SHA3":
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return func() SwarmHash { return &HashWithLength{sha3.NewKeccak256()} }
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case "BMT":
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return func() SwarmHash {
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hasher := sha3.NewKeccak256
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hasherSize := hasher().Size()
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segmentCount := ch.DefaultSize / hasherSize
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pool := bmt.NewTreePool(hasher, segmentCount, bmt.PoolSize)
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return bmt.New(pool)
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}
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}
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return nil
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}
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func (a Address) Hex() string {
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return fmt.Sprintf("%064x", []byte(a[:]))
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}
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func (a Address) Log() string {
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if len(a[:]) < 8 {
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return fmt.Sprintf("%x", []byte(a[:]))
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}
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return fmt.Sprintf("%016x", []byte(a[:8]))
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}
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func (a Address) String() string {
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return fmt.Sprintf("%064x", []byte(a))
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}
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func (a Address) MarshalJSON() (out []byte, err error) {
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return []byte(`"` + a.String() + `"`), nil
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}
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func (a *Address) UnmarshalJSON(value []byte) error {
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s := string(value)
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*a = make([]byte, 32)
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h := common.Hex2Bytes(s[1 : len(s)-1])
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copy(*a, h)
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return nil
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}
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type AddressCollection []Address
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func NewAddressCollection(l int) AddressCollection {
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return make(AddressCollection, l)
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}
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func (c AddressCollection) Len() int {
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return len(c)
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}
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func (c AddressCollection) Less(i, j int) bool {
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return bytes.Compare(c[i], c[j]) == -1
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}
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func (c AddressCollection) Swap(i, j int) {
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c[i], c[j] = c[j], c[i]
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}
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// Chunk interface implemented by context.Contexts and data chunks
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type Chunk interface {
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Address() Address
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Payload() []byte
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SpanBytes() []byte
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Span() int64
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Data() []byte
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}
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type chunk struct {
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addr Address
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sdata []byte
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span int64
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}
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func NewChunk(addr Address, data []byte) *chunk {
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return &chunk{
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addr: addr,
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sdata: data,
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span: -1,
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}
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}
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func (c *chunk) Address() Address {
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return c.addr
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}
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func (c *chunk) SpanBytes() []byte {
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return c.sdata[:8]
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}
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func (c *chunk) Span() int64 {
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if c.span == -1 {
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c.span = int64(binary.LittleEndian.Uint64(c.sdata[:8]))
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}
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return c.span
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}
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func (c *chunk) Data() []byte {
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return c.sdata
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}
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func (c *chunk) Payload() []byte {
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return c.sdata[8:]
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}
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// String() for pretty printing
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func (self *chunk) String() string {
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return fmt.Sprintf("Address: %v TreeSize: %v Chunksize: %v", self.addr.Log(), self.span, len(self.sdata))
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}
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func GenerateRandomChunk(dataSize int64) Chunk {
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hasher := MakeHashFunc(DefaultHash)()
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sdata := make([]byte, dataSize+8)
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rand.Read(sdata[8:])
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binary.LittleEndian.PutUint64(sdata[:8], uint64(dataSize))
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hasher.ResetWithLength(sdata[:8])
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hasher.Write(sdata[8:])
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return NewChunk(hasher.Sum(nil), sdata)
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}
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func GenerateRandomChunks(dataSize int64, count int) (chunks []Chunk) {
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if dataSize > ch.DefaultSize {
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dataSize = ch.DefaultSize
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}
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for i := 0; i < count; i++ {
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ch := GenerateRandomChunk(ch.DefaultSize)
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chunks = append(chunks, ch)
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}
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return chunks
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}
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func GenerateRandomData(l int) (r io.Reader, slice []byte) {
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slice, err := ioutil.ReadAll(io.LimitReader(rand.Reader, int64(l)))
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if err != nil {
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panic("rand error")
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}
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// log.Warn("generate random data", "len", len(slice), "data", common.Bytes2Hex(slice))
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r = io.LimitReader(bytes.NewReader(slice), int64(l))
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return r, slice
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}
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// Size, Seek, Read, ReadAt
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type LazySectionReader interface {
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Context() context.Context
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Size(context.Context, chan bool) (int64, error)
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io.Seeker
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io.Reader
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io.ReaderAt
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}
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type LazyTestSectionReader struct {
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*io.SectionReader
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}
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func (r *LazyTestSectionReader) Size(context.Context, chan bool) (int64, error) {
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return r.SectionReader.Size(), nil
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}
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func (r *LazyTestSectionReader) Context() context.Context {
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return context.TODO()
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}
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type StoreParams struct {
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Hash SwarmHasher `toml:"-"`
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DbCapacity uint64
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CacheCapacity uint
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BaseKey []byte
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}
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func NewDefaultStoreParams() *StoreParams {
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return NewStoreParams(defaultLDBCapacity, defaultCacheCapacity, nil, nil)
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}
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func NewStoreParams(ldbCap uint64, cacheCap uint, hash SwarmHasher, basekey []byte) *StoreParams {
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if basekey == nil {
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basekey = make([]byte, 32)
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}
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if hash == nil {
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hash = MakeHashFunc(DefaultHash)
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}
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return &StoreParams{
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Hash: hash,
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DbCapacity: ldbCap,
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CacheCapacity: cacheCap,
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BaseKey: basekey,
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}
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}
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type ChunkData []byte
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type Reference []byte
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// Putter is responsible to store data and create a reference for it
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type Putter interface {
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Put(context.Context, ChunkData) (Reference, error)
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// RefSize returns the length of the Reference created by this Putter
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RefSize() int64
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// Close is to indicate that no more chunk data will be Put on this Putter
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Close()
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// Wait returns if all data has been store and the Close() was called.
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Wait(context.Context) error
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}
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// Getter is an interface to retrieve a chunk's data by its reference
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type Getter interface {
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Get(context.Context, Reference) (ChunkData, error)
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}
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// NOTE: this returns invalid data if chunk is encrypted
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func (c ChunkData) Size() uint64 {
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return binary.LittleEndian.Uint64(c[:8])
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}
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func (c ChunkData) Data() []byte {
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return c[8:]
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}
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type ChunkValidator interface {
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Validate(addr Address, data []byte) bool
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}
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// Provides method for validation of content address in chunks
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// Holds the corresponding hasher to create the address
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type ContentAddressValidator struct {
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Hasher SwarmHasher
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}
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// Constructor
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func NewContentAddressValidator(hasher SwarmHasher) *ContentAddressValidator {
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return &ContentAddressValidator{
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Hasher: hasher,
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}
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}
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// Validate that the given key is a valid content address for the given data
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func (v *ContentAddressValidator) Validate(addr Address, data []byte) bool {
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if l := len(data); l < 9 || l > ch.DefaultSize+8 {
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// log.Error("invalid chunk size", "chunk", addr.Hex(), "size", l)
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return false
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}
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hasher := v.Hasher()
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hasher.ResetWithLength(data[:8])
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hasher.Write(data[8:])
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hash := hasher.Sum(nil)
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return bytes.Equal(hash, addr[:])
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}
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type ChunkStore interface {
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Put(ctx context.Context, ch Chunk) (err error)
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Get(rctx context.Context, ref Address) (ch Chunk, err error)
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Close()
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}
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// SyncChunkStore is a ChunkStore which supports syncing
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type SyncChunkStore interface {
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ChunkStore
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BinIndex(po uint8) uint64
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Iterator(from uint64, to uint64, po uint8, f func(Address, uint64) bool) error
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FetchFunc(ctx context.Context, ref Address) func(context.Context) error
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}
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// FakeChunkStore doesn't store anything, just implements the ChunkStore interface
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// It can be used to inject into a hasherStore if you don't want to actually store data just do the
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// hashing
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type FakeChunkStore struct {
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}
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// Put doesn't store anything it is just here to implement ChunkStore
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func (f *FakeChunkStore) Put(_ context.Context, ch Chunk) error {
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return nil
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}
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// Gut doesn't store anything it is just here to implement ChunkStore
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func (f *FakeChunkStore) Get(_ context.Context, ref Address) (Chunk, error) {
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panic("FakeChunkStore doesn't support Get")
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}
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// Close doesn't store anything it is just here to implement ChunkStore
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func (f *FakeChunkStore) Close() {
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}
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