mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-28 14:47:16 +00:00
286 lines
9.0 KiB
Go
286 lines
9.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package trie
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/ethdb"
|
|
"gopkg.in/karalabe/cookiejar.v2/collections/prque"
|
|
)
|
|
|
|
// request represents a scheduled or already in-flight state retrieval request.
|
|
type request struct {
|
|
hash common.Hash // Hash of the node data content to retrieve
|
|
data []byte // Data content of the node, cached until all subtrees complete
|
|
object *node // Target node to populate with retrieved data (hashnode originally)
|
|
|
|
parents []*request // Parent state nodes referencing this entry (notify all upon completion)
|
|
depth int // Depth level within the trie the node is located to prioritise DFS
|
|
deps int // Number of dependencies before allowed to commit this node
|
|
|
|
callback TrieSyncLeafCallback // Callback to invoke if a leaf node it reached on this branch
|
|
}
|
|
|
|
// SyncResult is a simple list to return missing nodes along with their request
|
|
// hashes.
|
|
type SyncResult struct {
|
|
Hash common.Hash // Hash of the originally unknown trie node
|
|
Data []byte // Data content of the retrieved node
|
|
}
|
|
|
|
// TrieSyncLeafCallback is a callback type invoked when a trie sync reaches a
|
|
// leaf node. It's used by state syncing to check if the leaf node requires some
|
|
// further data syncing.
|
|
type TrieSyncLeafCallback func(leaf []byte, parent common.Hash) error
|
|
|
|
// TrieSync is the main state trie synchronisation scheduler, which provides yet
|
|
// unknown trie hashes to retrieve, accepts node data associated with said hashes
|
|
// and reconstructs the trie step by step until all is done.
|
|
type TrieSync struct {
|
|
database ethdb.Database // State database for storing all the assembled node data
|
|
requests map[common.Hash]*request // Pending requests pertaining to a key hash
|
|
queue *prque.Prque // Priority queue with the pending requests
|
|
}
|
|
|
|
// NewTrieSync creates a new trie data download scheduler.
|
|
func NewTrieSync(root common.Hash, database ethdb.Database, callback TrieSyncLeafCallback) *TrieSync {
|
|
ts := &TrieSync{
|
|
database: database,
|
|
requests: make(map[common.Hash]*request),
|
|
queue: prque.New(),
|
|
}
|
|
ts.AddSubTrie(root, 0, common.Hash{}, callback)
|
|
return ts
|
|
}
|
|
|
|
// AddSubTrie registers a new trie to the sync code, rooted at the designated parent.
|
|
func (s *TrieSync) AddSubTrie(root common.Hash, depth int, parent common.Hash, callback TrieSyncLeafCallback) {
|
|
// Short circuit if the trie is empty or already known
|
|
if root == emptyRoot {
|
|
return
|
|
}
|
|
blob, _ := s.database.Get(root.Bytes())
|
|
if local, err := decodeNode(blob); local != nil && err == nil {
|
|
return
|
|
}
|
|
// Assemble the new sub-trie sync request
|
|
node := node(hashNode(root.Bytes()))
|
|
req := &request{
|
|
object: &node,
|
|
hash: root,
|
|
depth: depth,
|
|
callback: callback,
|
|
}
|
|
// If this sub-trie has a designated parent, link them together
|
|
if parent != (common.Hash{}) {
|
|
ancestor := s.requests[parent]
|
|
if ancestor == nil {
|
|
panic(fmt.Sprintf("sub-trie ancestor not found: %x", parent))
|
|
}
|
|
ancestor.deps++
|
|
req.parents = append(req.parents, ancestor)
|
|
}
|
|
s.schedule(req)
|
|
}
|
|
|
|
// AddRawEntry schedules the direct retrieval of a state entry that should not be
|
|
// interpreted as a trie node, but rather accepted and stored into the database
|
|
// as is. This method's goal is to support misc state metadata retrievals (e.g.
|
|
// contract code).
|
|
func (s *TrieSync) AddRawEntry(hash common.Hash, depth int, parent common.Hash) {
|
|
// Short circuit if the entry is empty or already known
|
|
if hash == emptyState {
|
|
return
|
|
}
|
|
if blob, _ := s.database.Get(hash.Bytes()); blob != nil {
|
|
return
|
|
}
|
|
// Assemble the new sub-trie sync request
|
|
req := &request{
|
|
hash: hash,
|
|
depth: depth,
|
|
}
|
|
// If this sub-trie has a designated parent, link them together
|
|
if parent != (common.Hash{}) {
|
|
ancestor := s.requests[parent]
|
|
if ancestor == nil {
|
|
panic(fmt.Sprintf("raw-entry ancestor not found: %x", parent))
|
|
}
|
|
ancestor.deps++
|
|
req.parents = append(req.parents, ancestor)
|
|
}
|
|
s.schedule(req)
|
|
}
|
|
|
|
// Missing retrieves the known missing nodes from the trie for retrieval.
|
|
func (s *TrieSync) Missing(max int) []common.Hash {
|
|
requests := []common.Hash{}
|
|
for !s.queue.Empty() && (max == 0 || len(requests) < max) {
|
|
requests = append(requests, s.queue.PopItem().(common.Hash))
|
|
}
|
|
return requests
|
|
}
|
|
|
|
// Process injects a batch of retrieved trie nodes data.
|
|
func (s *TrieSync) Process(results []SyncResult) (int, error) {
|
|
for i, item := range results {
|
|
// If the item was not requested, bail out
|
|
request := s.requests[item.Hash]
|
|
if request == nil {
|
|
return i, fmt.Errorf("not requested: %x", item.Hash)
|
|
}
|
|
// If the item is a raw entry request, commit directly
|
|
if request.object == nil {
|
|
request.data = item.Data
|
|
s.commit(request, nil)
|
|
continue
|
|
}
|
|
// Decode the node data content and update the request
|
|
node, err := decodeNode(item.Data)
|
|
if err != nil {
|
|
return i, err
|
|
}
|
|
*request.object = node
|
|
request.data = item.Data
|
|
|
|
// Create and schedule a request for all the children nodes
|
|
requests, err := s.children(request)
|
|
if err != nil {
|
|
return i, err
|
|
}
|
|
if len(requests) == 0 && request.deps == 0 {
|
|
s.commit(request, nil)
|
|
continue
|
|
}
|
|
request.deps += len(requests)
|
|
for _, child := range requests {
|
|
s.schedule(child)
|
|
}
|
|
}
|
|
return 0, nil
|
|
}
|
|
|
|
// Pending returns the number of state entries currently pending for download.
|
|
func (s *TrieSync) Pending() int {
|
|
return len(s.requests)
|
|
}
|
|
|
|
// schedule inserts a new state retrieval request into the fetch queue. If there
|
|
// is already a pending request for this node, the new request will be discarded
|
|
// and only a parent reference added to the old one.
|
|
func (s *TrieSync) schedule(req *request) {
|
|
// If we're already requesting this node, add a new reference and stop
|
|
if old, ok := s.requests[req.hash]; ok {
|
|
old.parents = append(old.parents, req.parents...)
|
|
return
|
|
}
|
|
// Schedule the request for future retrieval
|
|
s.queue.Push(req.hash, float32(req.depth))
|
|
s.requests[req.hash] = req
|
|
}
|
|
|
|
// children retrieves all the missing children of a state trie entry for future
|
|
// retrieval scheduling.
|
|
func (s *TrieSync) children(req *request) ([]*request, error) {
|
|
// Gather all the children of the node, irrelevant whether known or not
|
|
type child struct {
|
|
node *node
|
|
depth int
|
|
}
|
|
children := []child{}
|
|
|
|
switch node := (*req.object).(type) {
|
|
case shortNode:
|
|
children = []child{{
|
|
node: &node.Val,
|
|
depth: req.depth + len(node.Key),
|
|
}}
|
|
case fullNode:
|
|
for i := 0; i < 17; i++ {
|
|
if node[i] != nil {
|
|
children = append(children, child{
|
|
node: &node[i],
|
|
depth: req.depth + 1,
|
|
})
|
|
}
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("unknown node: %+v", node))
|
|
}
|
|
// Iterate over the children, and request all unknown ones
|
|
requests := make([]*request, 0, len(children))
|
|
for _, child := range children {
|
|
// Notify any external watcher of a new key/value node
|
|
if req.callback != nil {
|
|
if node, ok := (*child.node).(valueNode); ok {
|
|
if err := req.callback(node, req.hash); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
// If the child references another node, resolve or schedule
|
|
if node, ok := (*child.node).(hashNode); ok {
|
|
// Try to resolve the node from the local database
|
|
blob, _ := s.database.Get(node)
|
|
if local, err := decodeNode(blob); local != nil && err == nil {
|
|
*child.node = local
|
|
continue
|
|
}
|
|
// Locally unknown node, schedule for retrieval
|
|
requests = append(requests, &request{
|
|
object: child.node,
|
|
hash: common.BytesToHash(node),
|
|
parents: []*request{req},
|
|
depth: child.depth,
|
|
callback: req.callback,
|
|
})
|
|
}
|
|
}
|
|
return requests, nil
|
|
}
|
|
|
|
// commit finalizes a retrieval request and stores it into the database. If any
|
|
// of the referencing parent requests complete due to this commit, they are also
|
|
// committed themselves.
|
|
func (s *TrieSync) commit(req *request, batch ethdb.Batch) (err error) {
|
|
// Create a new batch if none was specified
|
|
if batch == nil {
|
|
batch = s.database.NewBatch()
|
|
defer func() {
|
|
err = batch.Write()
|
|
}()
|
|
}
|
|
// Write the node content to disk
|
|
if err := batch.Put(req.hash[:], req.data); err != nil {
|
|
return err
|
|
}
|
|
delete(s.requests, req.hash)
|
|
|
|
// Check all parents for completion
|
|
for _, parent := range req.parents {
|
|
parent.deps--
|
|
if parent.deps == 0 {
|
|
if err := s.commit(parent, batch); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|