github.com/e154/smart-home@v0.17.2-0.20240311175135-e530a6e5cd45/plugins/mqtt/storage.go (about)

     1  // This file is part of the Smart Home
     2  // Program complex distribution https://github.com/e154/smart-home
     3  // Copyright (C) 2016-2023, Filippov Alex
     4  //
     5  // This library is free software: you can redistribute it and/or
     6  // modify it under the terms of the GNU Lesser General Public
     7  // License as published by the Free Software Foundation; either
     8  // version 3 of the License, or (at your option) any later version.
     9  //
    10  // This library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13  // Library General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public
    16  // License along with this library.  If not, see
    17  // <https://www.gnu.org/licenses/>.
    18  
    19  package mqtt
    20  
    21  import (
    22  	"sync"
    23  )
    24  
    25  // Storage ...
    26  type Storage struct {
    27  	mx   *sync.Mutex
    28  	pull map[string]interface{}
    29  }
    30  
    31  // NewStorage ...
    32  func NewStorage() Storage {
    33  	return Storage{
    34  		mx:   &sync.Mutex{},
    35  		pull: make(map[string]interface{}),
    36  	}
    37  }
    38  
    39  // GetVar ...
    40  func (s *Storage) GetVar(key string) (value interface{}) {
    41  
    42  	s.mx.Lock()
    43  	if v, ok := s.pull[key]; ok {
    44  		value = v
    45  	} else {
    46  		value = nil
    47  	}
    48  	s.mx.Unlock()
    49  	return
    50  }
    51  
    52  // SetVar ...
    53  func (s *Storage) SetVar(key string, value interface{}) {
    54  
    55  	s.mx.Lock()
    56  	s.pull[key] = value
    57  	s.mx.Unlock()
    58  }
    59  
    60  func (s *Storage) copy(newPull map[string]interface{}) {
    61  	s.mx.Lock()
    62  	for key := range s.pull {
    63  		delete(s.pull, key)
    64  	}
    65  	for k, v := range newPull {
    66  		s.pull[k] = v
    67  	}
    68  	s.mx.Unlock()
    69  }