github.com/codingfuture/orig-energi3@v0.8.4/energi/common/proxy.go (about)

     1  // Copyright 2019 The Energi Core Authors
     2  // This file is part of the Energi Core library.
     3  //
     4  // The Energi Core library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The Energi Core library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the Energi Core library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package common
    18  
    19  import (
    20  	"context"
    21  
    22  	"github.com/ethereum/go-ethereum/common"
    23  	"github.com/ethereum/go-ethereum/core"
    24  	"github.com/ethereum/go-ethereum/core/state"
    25  
    26  	energi_params "energi.world/core/gen3/energi/params"
    27  )
    28  
    29  // GeneralProxyHashFunc provides the function that helps check for governed
    30  // proxy contracts filtered logs.
    31  type GeneralProxyHashFunc func(addr common.Address, blockheight *uint64) *common.Hash
    32  
    33  // GeneralProxyHashGen returns a function that helps retrieve the governed proxy contract hash.
    34  func GeneralProxyHashGen(blockchain *core.BlockChain) GeneralProxyHashFunc {
    35  	return func(addr common.Address, blockheight *uint64) *common.Hash {
    36  		var err error
    37  		var statedb *state.StateDB
    38  
    39  		if blockheight == nil || *blockheight < 1 {
    40  			statedb, err = blockchain.State()
    41  		} else {
    42  			header := blockchain.GetHeaderByNumber(*blockheight)
    43  			statedb, err = blockchain.StateAt(header.Hash())
    44  		}
    45  		if err != nil {
    46  			return nil
    47  		}
    48  
    49  		// Get a hash that allows logs from governed proxy checkpoint contract to be filtered.
    50  		prxyHash := statedb.GetState(addr, energi_params.Storage_ProxyImpl)
    51  		return &prxyHash
    52  	}
    53  }
    54  
    55  // GeneralProxyHashExtractor retrieves if it exists the proxy hash func passed
    56  // through the context.
    57  func GeneralProxyHashExtractor(ctx context.Context, qAddr common.Address, blockNo *uint64) *common.Hash {
    58  	proxyHashFunc := ctx.Value(energi_params.GeneralProxyCtxKey).(GeneralProxyHashFunc)
    59  	if proxyHashFunc == nil {
    60  		return nil
    61  	}
    62  
    63  	return proxyHashFunc(qAddr, blockNo)
    64  }