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shared.go
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shared.go
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// Copyright 2020 Paul Greenberg greenpau@outlook.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package shared
import (
"fmt"
"sync"
)
var (
// Buffer is a key-value store.
Buffer *buffer
)
func init() {
Buffer = newBuffer()
}
type buffer struct {
mu sync.RWMutex
Entries map[string]string
}
func newBuffer() *buffer {
c := &buffer{
Entries: make(map[string]string),
}
return c
}
// Add adds a serialized key to the buffer.
func (c *buffer) Add(k, v string) error {
if k == "" || v == "" {
return fmt.Errorf("invalid input")
}
c.mu.Lock()
defer c.mu.Unlock()
if _, exists := c.Entries[k]; exists {
return fmt.Errorf("not empty")
}
c.Entries[k] = v
return nil
}
// Get returns a serialized key from the stash.
func (c *buffer) Get(k string) (string, error) {
c.mu.Lock()
defer c.mu.Unlock()
if v, exists := c.Entries[k]; exists {
return v, nil
}
return "", fmt.Errorf("not found")
}