mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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97887d98da
* swarm/network, swarm/storage: validate default chunk size * swarm/bmt, swarm/network, swarm/storage: update BMT hash initialisation * swarm/bmt: move segmentCount to tests * swarm/chunk: change chunk.DefaultSize to be untyped const * swarm/storage: add size validator * swarm/storage: add chunk size validation to localstore * swarm/storage: move validation from localstore to validator * swarm/storage: global chunk rules in MRU
149 lines
5.0 KiB
Go
149 lines
5.0 KiB
Go
// Copyright 2018 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 mru
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import (
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"encoding/binary"
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"errors"
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"github.com/ethereum/go-ethereum/swarm/chunk"
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"github.com/ethereum/go-ethereum/swarm/log"
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"github.com/ethereum/go-ethereum/swarm/multihash"
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)
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// resourceUpdate encapsulates the information sent as part of a resource update
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type resourceUpdate struct {
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updateHeader // metainformationa about this resource update
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data []byte // actual data payload
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}
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// Update chunk layout
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// Prefix:
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// 2 bytes updateHeaderLength
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// 2 bytes data length
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const chunkPrefixLength = 2 + 2
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// Header: (see updateHeader)
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// Data:
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// data (datalength bytes)
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//
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// Minimum size is Header + 1 (minimum data length, enforced)
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const minimumUpdateDataLength = updateHeaderLength + 1
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const maxUpdateDataLength = chunk.DefaultSize - signatureLength - updateHeaderLength - chunkPrefixLength
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// binaryPut serializes the resource update information into the given slice
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func (r *resourceUpdate) binaryPut(serializedData []byte) error {
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datalength := len(r.data)
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if datalength == 0 {
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return NewError(ErrInvalidValue, "cannot update a resource with no data")
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}
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if datalength > maxUpdateDataLength {
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return NewErrorf(ErrInvalidValue, "data is too big (length=%d). Max length=%d", datalength, maxUpdateDataLength)
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}
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if len(serializedData) != r.binaryLength() {
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return NewErrorf(ErrInvalidValue, "slice passed to putBinary must be of exact size. Expected %d bytes", r.binaryLength())
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}
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if r.multihash {
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if _, _, err := multihash.GetMultihashLength(r.data); err != nil {
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return NewError(ErrInvalidValue, "Invalid multihash")
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}
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}
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// Add prefix: updateHeaderLength and actual data length
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cursor := 0
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binary.LittleEndian.PutUint16(serializedData[cursor:], uint16(updateHeaderLength))
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cursor += 2
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// data length
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binary.LittleEndian.PutUint16(serializedData[cursor:], uint16(datalength))
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cursor += 2
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// serialize header (see updateHeader)
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if err := r.updateHeader.binaryPut(serializedData[cursor : cursor+updateHeaderLength]); err != nil {
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return err
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}
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cursor += updateHeaderLength
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// add the data
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copy(serializedData[cursor:], r.data)
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cursor += datalength
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return nil
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}
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// binaryLength returns the expected number of bytes this structure will take to encode
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func (r *resourceUpdate) binaryLength() int {
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return chunkPrefixLength + updateHeaderLength + len(r.data)
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}
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// binaryGet populates this instance from the information contained in the passed byte slice
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func (r *resourceUpdate) binaryGet(serializedData []byte) error {
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if len(serializedData) < minimumUpdateDataLength {
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return NewErrorf(ErrNothingToReturn, "chunk less than %d bytes cannot be a resource update chunk", minimumUpdateDataLength)
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}
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cursor := 0
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declaredHeaderlength := binary.LittleEndian.Uint16(serializedData[cursor : cursor+2])
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if declaredHeaderlength != updateHeaderLength {
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return NewErrorf(ErrCorruptData, "Invalid header length. Expected %d, got %d", updateHeaderLength, declaredHeaderlength)
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}
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cursor += 2
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datalength := int(binary.LittleEndian.Uint16(serializedData[cursor : cursor+2]))
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cursor += 2
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if chunkPrefixLength+updateHeaderLength+datalength+signatureLength != len(serializedData) {
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return NewError(ErrNothingToReturn, "length specified in header is different than actual chunk size")
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}
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// at this point we can be satisfied that we have the correct data length to read
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if err := r.updateHeader.binaryGet(serializedData[cursor : cursor+updateHeaderLength]); err != nil {
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return err
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}
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cursor += updateHeaderLength
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data := serializedData[cursor : cursor+datalength]
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cursor += datalength
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// if multihash content is indicated we check the validity of the multihash
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if r.updateHeader.multihash {
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mhLength, mhHeaderLength, err := multihash.GetMultihashLength(data)
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if err != nil {
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log.Error("multihash parse error", "err", err)
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return err
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}
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if datalength != mhLength+mhHeaderLength {
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log.Debug("multihash error", "datalength", datalength, "mhLength", mhLength, "mhHeaderLength", mhHeaderLength)
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return errors.New("Corrupt multihash data")
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}
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}
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// now that all checks have passed, copy data into structure
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r.data = make([]byte, datalength)
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copy(r.data, data)
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return nil
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}
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// Multihash specifies whether the resource data should be interpreted as multihash
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func (r *resourceUpdate) Multihash() bool {
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return r.multihash
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}
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