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helpers.go
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/
helpers.go
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// Copyright (c) 2014 The gomqtt Authors. All rights reserved.
//
// 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 broker
import (
"sync"
"github.com/gomqtt/packet"
"github.com/satori/go.uuid"
)
/* state */
// a state keeps track of the clients current state
type state struct {
sync.Mutex
current byte
}
// create new state
func newState(init byte) *state {
return &state{
current: init,
}
}
// set will change to the specified state
func (s *state) set(state byte) {
s.Lock()
defer s.Unlock()
s.current = state
}
// get will retrieve the current state
func (s *state) get() byte {
s.Lock()
defer s.Unlock()
return s.current
}
/* Context */
// A Context is a store for custom data.
type Context struct {
store map[string]interface{}
mutex sync.Mutex
}
// NewContext returns a new Context.
func NewContext() *Context {
return &Context{
store: make(map[string]interface{}),
}
}
// Set sets the passed value for the key in the context.
func (c *Context) Set(key string, value interface{}) {
c.mutex.Lock()
defer c.mutex.Unlock()
c.store[key] = value
}
// Get returns the stored valued for the passed key.
func (c *Context) Get(key string) interface{} {
c.mutex.Lock()
defer c.mutex.Unlock()
return c.store[key]
}
/* fakeClient */
// a fake client for testing backend implementations
type fakeClient struct {
in []*packet.Message
ctx *Context
}
// returns a new fake client
func newFakeClient() *fakeClient {
ctx := NewContext()
ctx.Set("uuid", uuid.NewV1().String())
return &fakeClient{
ctx: ctx,
}
}
// publish will append the message to the in slice
func (c *fakeClient) Publish(msg *packet.Message) bool {
c.in = append(c.in, msg)
return true
}
// does nothing atm
func (c *fakeClient) Close(clean bool) {}
// returns the context
func (c *fakeClient) Context() *Context {
return c.ctx
}