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package sources
import (
"context"
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/rawdb"
)
type DebugClient struct {
callContext CallContextFn
}
func NewDebugClient(callContext CallContextFn) *DebugClient {
return &DebugClient{callContext}
}
func (o *DebugClient) NodeByHash(ctx context.Context, hash common.Hash) ([]byte, error) {
// MPT nodes are stored as the hash of the node (with no prefix)
node, err := o.dbGet(ctx, hash[:])
if err != nil {
return nil, fmt.Errorf("failed to retrieve state MPT node: %w", err)
}
return node, nil
}
func (o *DebugClient) CodeByHash(ctx context.Context, hash common.Hash) ([]byte, error) {
// First try retrieving with the new code prefix
code, err := o.dbGet(ctx, append(append(make([]byte, 0), rawdb.CodePrefix...), hash[:]...))
if err != nil {
// Fallback to the legacy un-prefixed version
code, err = o.dbGet(ctx, hash[:])
if err != nil {
return nil, fmt.Errorf("failed to retrieve contract code, using new and legacy keys, with codehash %s: %w", hash, err)
}
}
return code, nil
}
func (o *DebugClient) dbGet(ctx context.Context, key []byte) ([]byte, error) {
var node hexutil.Bytes
err := o.callContext(ctx, &node, "debug_dbGet", hexutil.Encode(key))
if err != nil {
return nil, fmt.Errorf("fetch error %x: %w", key, err)
}
return node, nil
}