github.com/digdeepmining/go-atheios@v1.5.13-0.20180902133602-d5687a2e6f43/ethdb/memory_database.go (about)

     1  // Copyright 2014 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package ethdb
    18  
    19  import (
    20  	"errors"
    21  	"sync"
    22  
    23  	"github.com/atheioschain/go-atheios/common"
    24  )
    25  
    26  /*
    27   * This is a test memory database. Do not use for any production it does not get persisted
    28   */
    29  type MemDatabase struct {
    30  	db   map[string][]byte
    31  	lock sync.RWMutex
    32  }
    33  
    34  func NewMemDatabase() (*MemDatabase, error) {
    35  	return &MemDatabase{
    36  		db: make(map[string][]byte),
    37  	}, nil
    38  }
    39  
    40  func (db *MemDatabase) Put(key []byte, value []byte) error {
    41  	db.lock.Lock()
    42  	defer db.lock.Unlock()
    43  
    44  	db.db[string(key)] = common.CopyBytes(value)
    45  	return nil
    46  }
    47  
    48  func (db *MemDatabase) Set(key []byte, value []byte) {
    49  	db.lock.Lock()
    50  	defer db.lock.Unlock()
    51  
    52  	db.Put(key, value)
    53  }
    54  
    55  func (db *MemDatabase) Get(key []byte) ([]byte, error) {
    56  	db.lock.RLock()
    57  	defer db.lock.RUnlock()
    58  
    59  	if entry, ok := db.db[string(key)]; ok {
    60  		return entry, nil
    61  	}
    62  	return nil, errors.New("not found")
    63  }
    64  
    65  func (db *MemDatabase) Keys() [][]byte {
    66  	db.lock.RLock()
    67  	defer db.lock.RUnlock()
    68  
    69  	keys := [][]byte{}
    70  	for key := range db.db {
    71  		keys = append(keys, []byte(key))
    72  	}
    73  	return keys
    74  }
    75  
    76  /*
    77  func (db *MemDatabase) GetKeys() []*common.Key {
    78  	data, _ := db.Get([]byte("KeyRing"))
    79  
    80  	return []*common.Key{common.NewKeyFromBytes(data)}
    81  }
    82  */
    83  
    84  func (db *MemDatabase) Delete(key []byte) error {
    85  	db.lock.Lock()
    86  	defer db.lock.Unlock()
    87  
    88  	delete(db.db, string(key))
    89  	return nil
    90  }
    91  
    92  func (db *MemDatabase) Close() {}
    93  
    94  func (db *MemDatabase) NewBatch() Batch {
    95  	return &memBatch{db: db}
    96  }
    97  
    98  type kv struct{ k, v []byte }
    99  
   100  type memBatch struct {
   101  	db     *MemDatabase
   102  	writes []kv
   103  	lock   sync.RWMutex
   104  }
   105  
   106  func (b *memBatch) Put(key, value []byte) error {
   107  	b.lock.Lock()
   108  	defer b.lock.Unlock()
   109  
   110  	b.writes = append(b.writes, kv{common.CopyBytes(key), common.CopyBytes(value)})
   111  	return nil
   112  }
   113  
   114  func (b *memBatch) Write() error {
   115  	b.lock.RLock()
   116  	defer b.lock.RUnlock()
   117  
   118  	b.db.lock.Lock()
   119  	defer b.db.lock.Unlock()
   120  
   121  	for _, kv := range b.writes {
   122  		b.db.db[string(kv.k)] = kv.v
   123  	}
   124  	return nil
   125  }