117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
/*
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Copyright © 2021 Vincent Batts <vbatts@kinvolk.io>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cmd
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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"time"
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mqtt "github.com/eclipse/paho.mqtt.golang"
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"github.com/spf13/cobra"
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)
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// pubCmd represents the pub command
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var pubCmd = &cobra.Command{
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Use: "pub",
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Short: "A brief description of your command",
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Long: `A longer description that spans multiple lines and likely contains examples
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and usage of using your command. For example:
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Cobra is a CLI library for Go that empowers applications.
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This application is a tool to generate the needed files
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to quickly create a Cobra application.`,
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Run: func(cmd *cobra.Command, args []string) {
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fmt.Println("pub called")
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opts := mqtt.NewClientOptions().AddBroker("tcp://infra1.batts.lan:1883")
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// set the id to the client.
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opts.SetClientID("dang-pub")
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// create a new client.
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c := mqtt.NewClient(opts)
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//message := "hello this is the trial message"
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//c.Publish("some_topic", 0, false, message)
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//we are going to try connecting for max 10 times to the server if the connection fails.
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for i := 0; i < 10; i++ {
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if token := c.Connect(); token.Wait() && token.Error() == nil {
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break
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} else {
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fmt.Println(token.Error())
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time.Sleep(1 * time.Second)
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}
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}
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//subscribe to the topic /go-mqtt/sample and request messages to be delivered
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//at a maximum qos of zero, wait for the receipt to confirm the subscription
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//same thing needs to go here as well.
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if token := c.Subscribe("some_topic", 0, nil); token.Wait() && token.Error() != nil {
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fmt.Println(token.Error())
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os.Exit(1)
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}
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// this is the shell where we will take input from the user and publish the message on the topic until user enters `bye`.
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for {
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var message string
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fmt.Print(">> ")
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// create a new bffer reader.
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reader := bufio.NewReader(os.Stdin)
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// read a string.
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message, err := reader.ReadString('\n')
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if err != nil {
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fmt.Println(err)
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}
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if strings.Compare(message, "\n") > 0 {
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// if there is a message, publish it.
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token := c.Publish("some_topic", 0, false, message)
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if strings.Compare(message, "bye\n") == 0 {
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// if message == "bye" then exit the shell.
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break
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}
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token.Wait()
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}
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}
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//unsubscribe from /go-mqtt/sample
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if token := c.Unsubscribe("some_topic"); token.Wait() && token.Error() != nil {
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fmt.Println(token.Error())
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os.Exit(1)
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}
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c.Disconnect(250)
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},
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}
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func init() {
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rootCmd.AddCommand(pubCmd)
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// Here you will define your flags and configuration settings.
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// Cobra supports Persistent Flags which will work for this command
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// and all subcommands, e.g.:
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// pubCmd.PersistentFlags().String("foo", "", "A help for foo")
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// Cobra supports local flags which will only run when this command
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// is called directly, e.g.:
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// pubCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
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}
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