94 lines
3.8 KiB
Go
94 lines
3.8 KiB
Go
// Copyright 2017-2021 DERO Project. All rights reserved.
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// Use of this source code in any form is governed by RESEARCH license.
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// license can be found in the LICENSE file.
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// GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8
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//
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package p2p
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//import "fmt"
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//import "net"
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//import "container/list"
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import "github.com/deroproject/derohe/cryptography/crypto"
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import "github.com/deroproject/derohe/globals"
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//import "github.com/deroproject/derosuite/blockchain"
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// peer has requested chain
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func (c *Connection) Chain(request Chain_Request_Struct, response *Chain_Response_Struct) error {
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defer handle_connection_panic(c)
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if len(request.Block_list) < 1 { // malformed request ban peer
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c.logger.V(3).Info("malformed chain request received, banning peer", "request", request)
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c.exit()
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return nil
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}
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if len(request.Block_list) != len(request.TopoHeights) || len(request.Block_list) > 1024 {
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c.logger.V(3).Info("Peer chain is invalid", "blocks", len(request.Block_list), "topos", len(request.TopoHeights))
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c.exit()
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return nil
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}
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if request.Block_list[len(request.Block_list)-1] != globals.Config.Genesis_Block_Hash {
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c.logger.V(3).Info("Peer chain is invalid", "blocks", len(request.Block_list), "topos", len(request.TopoHeights))
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c.exit()
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return nil
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}
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// we must give user our version of the chain
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start_height := int64(0)
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start_topoheight := int64(0)
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for i := 0; i < len(request.Block_list); i++ { // find the common point in our chain ( the block is NOT orphan)
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//c.logger.Info("Checking block for chain detection", "i",i, "topo",request.TopoHeights[i], "blid", crypto.Hash(request.Block_list[i]))
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if chain.Block_Exists(request.Block_list[i]) && chain.Is_Block_Topological_order(request.Block_list[i]) &&
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request.TopoHeights[i] == chain.Load_Block_Topological_order(request.Block_list[i]) {
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start_height = chain.Load_Height_for_BL_ID(request.Block_list[i])
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start_topoheight = chain.Load_Block_Topological_order(request.Block_list[i])
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c.logger.V(2).Info("Found common point in chain", "hash", crypto.Hash(request.Block_list[i]), "height", start_height, "topoheight", start_topoheight)
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break
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}
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}
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// we can serve maximum of 512 BLID = 16K KB
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const MAX_BLOCKS = 512
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for i := start_topoheight; i <= chain.Load_TOPO_HEIGHT() && len(response.Block_list) <= MAX_BLOCKS; i++ {
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hash, _ := chain.Load_Block_Topological_order_at_index(i)
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response.Block_list = append(response.Block_list, [32]byte(hash))
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}
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// we must also fill blocks for the last top 10 heights, so client can sync faster to alt tips
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top_height := chain.Get_Height()
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counter := 0
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for ; top_height > 0 && counter <= 10; top_height-- {
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blocks := chain.Get_Blocks_At_Height(top_height)
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for i := range blocks {
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response.TopBlocks = append([][32]byte{blocks[i]}, response.TopBlocks...) // blocks are ordered height wise
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}
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counter++
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}
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response.Start_height = start_height
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response.Start_topoheight = start_topoheight
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fill_common(&response.Common) // fill common info
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c.update(&request.Common) // update common information
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return nil
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}
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