github.com/turingchain2020/turingchain@v1.1.21/system/dapp/coins/executor/coinsdb.go (about)

     1  // Copyright Turing Corp. 2018 All Rights Reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package executor
     6  
     7  /*
     8  coins 是一个货币的exec。内置货币的执行器。
     9  
    10  主要提供两种操作：
    11  EventTransfer -> 转移资产
    12  */
    13  
    14  // package none execer for unknow execer
    15  // all none transaction exec ok, execept nofee
    16  // nofee transaction will not pack into block
    17  
    18  import (
    19  	"fmt"
    20  
    21  	dbm "github.com/turingchain2020/turingchain/common/db"
    22  	"github.com/turingchain2020/turingchain/types"
    23  )
    24  
    25  // calcAddrKey store information on the receiving address
    26  func calcAddrKey(addr string) []byte {
    27  	return []byte(fmt.Sprintf("LODB-coins-Addr:%s", addr))
    28  }
    29  
    30  func geAddrReciverKV(addr string, reciverAmount int64) *types.KeyValue {
    31  	reciver := &types.Int64{Data: reciverAmount}
    32  	amountbytes := types.Encode(reciver)
    33  	kv := &types.KeyValue{Key: calcAddrKey(addr), Value: amountbytes}
    34  	return kv
    35  }
    36  
    37  func getAddrReciver(db dbm.KVDB, addr string) (int64, error) {
    38  	reciver := types.Int64{}
    39  	addrReciver, err := db.Get(calcAddrKey(addr))
    40  	if err != nil && err != types.ErrNotFound {
    41  		return 0, err
    42  	}
    43  	if len(addrReciver) == 0 {
    44  		return 0, nil
    45  	}
    46  	err = types.Decode(addrReciver, &reciver)
    47  	if err != nil {
    48  		return 0, err
    49  	}
    50  	return reciver.Data, nil
    51  }
    52  
    53  func setAddrReciver(db dbm.KVDB, addr string, reciverAmount int64) error {
    54  	kv := geAddrReciverKV(addr, reciverAmount)
    55  	return db.Set(kv.Key, kv.Value)
    56  }
    57  
    58  func updateAddrReciver(cachedb dbm.KVDB, addr string, amount int64, isadd bool) (*types.KeyValue, error) {
    59  	recv, err := getAddrReciver(cachedb, addr)
    60  	if err != nil && err != types.ErrNotFound {
    61  		return nil, err
    62  	}
    63  	if isadd {
    64  		recv += amount
    65  	} else {
    66  		recv -= amount
    67  	}
    68  	err = setAddrReciver(cachedb, addr, recv)
    69  	if err != nil {
    70  		return nil, err
    71  	}
    72  	//keyvalue
    73  	return geAddrReciverKV(addr, recv), nil
    74  }