github.com/greenpau/go-authcrunch@v1.1.4/pkg/shared/shared.go (about)

     1  // Copyright 2022 Paul Greenberg greenpau@outlook.com
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package shared
    16  
    17  import (
    18  	"fmt"
    19  	"sync"
    20  )
    21  
    22  var (
    23  	// Buffer is a key-value store.
    24  	Buffer *buffer
    25  )
    26  
    27  func init() {
    28  	Buffer = newBuffer()
    29  }
    30  
    31  type buffer struct {
    32  	mu      sync.RWMutex
    33  	Entries map[string]string
    34  }
    35  
    36  func newBuffer() *buffer {
    37  	c := &buffer{
    38  		Entries: make(map[string]string),
    39  	}
    40  	return c
    41  }
    42  
    43  // Add adds a serialized key to the buffer.
    44  func (c *buffer) Add(k, v string) error {
    45  	if k == "" || v == "" {
    46  		return fmt.Errorf("invalid input")
    47  	}
    48  	c.mu.Lock()
    49  	defer c.mu.Unlock()
    50  	if _, exists := c.Entries[k]; exists {
    51  		return fmt.Errorf("not empty")
    52  	}
    53  	c.Entries[k] = v
    54  	return nil
    55  }
    56  
    57  // Get returns a serialized key from the stash.
    58  func (c *buffer) Get(k string) (string, error) {
    59  	c.mu.Lock()
    60  	defer c.mu.Unlock()
    61  	if v, exists := c.Entries[k]; exists {
    62  		return v, nil
    63  	}
    64  	return "", fmt.Errorf("not found")
    65  }