8293f546af
This implementation is similar to AMQP notifications: * Notifications are published on a single topic as a JSON feed * Topic is configurable, as is the QoS. Uses the paho.mqtt.golang library for the mqtt connection, and supports connections over tcp and websockets, with optional secure tls support. * Additionally the minio server configuration has been bumped up so mqtt configuration can be added. * Configuration migration code is added with tests. MQTT is an ISO standard M2M/IoT messaging protocol and was originally designed for applications for limited bandwidth networks. Today it's use is growing in the IoT space.
80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
/*
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* Copyright (c) 2013 IBM Corp.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* Seth Hoenig
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* Allan Stockdill-Mander
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* Mike Robertson
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*/
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package mqtt
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import (
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"fmt"
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"sync"
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)
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// MId is 16 bit message id as specified by the MQTT spec.
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// In general, these values should not be depended upon by
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// the client application.
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type MId uint16
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type messageIds struct {
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sync.RWMutex
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index map[uint16]Token
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}
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const (
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midMin uint16 = 1
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midMax uint16 = 65535
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)
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func (mids *messageIds) cleanUp() {
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mids.Lock()
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for _, token := range mids.index {
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switch t := token.(type) {
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case *PublishToken:
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t.err = fmt.Errorf("Connection lost before Publish completed")
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case *SubscribeToken:
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t.err = fmt.Errorf("Connection lost before Subscribe completed")
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case *UnsubscribeToken:
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t.err = fmt.Errorf("Connection lost before Unsubscribe completed")
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}
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token.flowComplete()
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}
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mids.index = make(map[uint16]Token)
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mids.Unlock()
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}
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func (mids *messageIds) freeID(id uint16) {
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mids.Lock()
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delete(mids.index, id)
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mids.Unlock()
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}
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func (mids *messageIds) getID(t Token) uint16 {
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mids.Lock()
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defer mids.Unlock()
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for i := midMin; i < midMax; i++ {
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if _, ok := mids.index[i]; !ok {
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mids.index[i] = t
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return i
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}
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}
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return 0
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}
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func (mids *messageIds) getToken(id uint16) Token {
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mids.RLock()
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defer mids.RUnlock()
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if token, ok := mids.index[id]; ok {
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return token
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}
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return nil
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}
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