2022-01-13 05:23:34 +08:00
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package mq
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import (
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2022-01-16 07:16:44 +08:00
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"encoding/json"
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"errors"
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"fmt"
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"log"
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"strings"
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mqtt "github.com/eclipse/paho.mqtt.golang"
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"github.com/gravitl/netmaker/database"
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"github.com/gravitl/netmaker/logger"
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"github.com/gravitl/netmaker/logic"
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"github.com/gravitl/netmaker/models"
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"github.com/gravitl/netmaker/servercfg"
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)
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// DefaultHandler default message queue handler - only called when GetDebug == true
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var DefaultHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
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logger.Log(0, "MQTT Message: Topic: ", string(msg.Topic()), " Message: ", string(msg.Payload()))
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}
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2022-01-21 18:19:17 +08:00
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// Ping message Handler -- handles ping topic from client nodes
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var Ping mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
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logger.Log(0, "Ping Handler: ", msg.Topic())
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go func() {
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id, err := GetID(msg.Topic())
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if err != nil {
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logger.Log(0, "error getting node.ID sent on ping topic ")
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return
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}
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node, err := logic.GetNodeByID(id)
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if err != nil {
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logger.Log(0, "mq-ping error getting node: ", err.Error())
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record, err := database.FetchRecord(database.NODES_TABLE_NAME, id)
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if err != nil {
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logger.Log(0, "error reading database ", err.Error())
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return
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}
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logger.Log(0, "record from database")
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logger.Log(0, record)
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return
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}
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2022-01-29 22:46:17 +08:00
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fmt.Printf("length before ping decrypt %d ", len(msg.Payload()))
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decryptedMsg, decryptErr := decryptMsg(&node, msg.Payload())
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if decryptErr != nil {
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logger.Log(0, "error updating node ", node.ID, err.Error())
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return
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}
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fmt.Printf("length after ping decrypt %d and msg: %s \n", len(decryptedMsg), string(decryptedMsg))
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node.SetLastCheckIn()
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if err := logic.UpdateNode(&node, &node); err != nil {
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logger.Log(0, "error updating node ", err.Error())
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}
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logger.Log(0, "ping processed")
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// --TODO --set client version once feature is implemented.
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//node.SetClientVersion(msg.Payload())
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}()
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}
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2022-01-21 18:19:17 +08:00
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// UpdateNode message Handler -- handles updates from client nodes
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var UpdateNode mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
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go func() {
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id, err := GetID(msg.Topic())
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if err != nil {
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logger.Log(1, "error getting node.ID sent on ", msg.Topic(), err.Error())
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return
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}
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currentNode, err := logic.GetNodeByID(id)
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if err != nil {
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logger.Log(1, "error getting node ", id, err.Error())
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return
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}
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decrypted, decryptErr := decryptMsg(¤tNode, msg.Payload())
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if decryptErr != nil {
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logger.Log(1, "failed to decrypt message for node ", id, decryptErr.Error())
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return
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}
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logger.Log(1, "Update Node Handler", id)
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var newNode models.Node
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if err := json.Unmarshal(decrypted, &newNode); err != nil {
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logger.Log(1, "error unmarshaling payload ", err.Error())
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return
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}
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if err := logic.UpdateNode(¤tNode, &newNode); err != nil {
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logger.Log(1, "error saving node", err.Error())
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}
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if logic.ShouldPeersUpdate(¤tNode, &newNode) {
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if err := PublishPeerUpdate(&newNode); err != nil {
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logger.Log(1, "error publishing peer update ", err.Error())
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return
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}
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}
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}()
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}
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// PublishPeerUpdate --- deterines and publishes a peer update to all the peers of a node
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func PublishPeerUpdate(newNode *models.Node) error {
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if !servercfg.IsMessageQueueBackend() {
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return nil
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}
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networkNodes, err := logic.GetNetworkNodes(newNode.Network)
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if err != nil {
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logger.Log(1, "err getting Network Nodes", err.Error())
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return err
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}
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for _, node := range networkNodes {
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if node.IsServer == "yes" {
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continue
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}
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peerUpdate, err := logic.GetPeerUpdate(&node)
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if err != nil {
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logger.Log(1, "error getting peer update for node ", node.ID, err.Error())
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continue
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}
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data, err := json.Marshal(&peerUpdate)
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if err != nil {
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logger.Log(2, "error marshaling peer update for node", node.ID, err.Error())
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continue
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}
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if err = publish(&node, fmt.Sprintf("peers/%s/%s", node.Network, node.ID), data); err != nil {
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logger.Log(1, "failed to publish peer update for node", node.ID)
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}
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}
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return nil
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}
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// GetID -- decodes a message queue topic and returns the embedded node.ID
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func GetID(topic string) (string, error) {
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parts := strings.Split(topic, "/")
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count := len(parts)
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if count == 1 {
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return "", errors.New("invalid topic")
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}
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//the last part of the topic will be the node.ID
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return parts[count-1], nil
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}
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// NodeUpdate -- publishes a node update
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func NodeUpdate(node *models.Node) error {
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if !servercfg.IsMessageQueueBackend() {
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return nil
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}
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logger.Log(3, "publishing node update to "+node.Name)
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data, err := json.Marshal(node)
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if err != nil {
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logger.Log(2, "error marshalling node update ", err.Error())
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return err
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}
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2022-01-29 22:14:18 +08:00
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if err = publish(node, fmt.Sprintf("update/%s/%s", node.Network, node.ID), data); err != nil {
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logger.Log(2, "error publishing node update to peer ", node.ID, err.Error())
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return err
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}
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return nil
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}
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// SetupMQTT creates a connection to broker and return client
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func SetupMQTT() mqtt.Client {
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opts := mqtt.NewClientOptions()
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broker := servercfg.GetMessageQueueEndpoint()
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opts.AddBroker(broker)
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client := mqtt.NewClient(opts)
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if token := client.Connect(); token.Wait() && token.Error() != nil {
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log.Fatal(token.Error())
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}
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return client
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}
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