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Executing python in js - troublshooting/development

Scheduled Pinned Locked Moved Troubleshooting
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  • S Away
    sdetweil @beejay22
    last edited by sdetweil Aug 24, 2020, 11:21 PM Aug 24, 2020, 11:19 PM

    @beejay22 u can run python3 as the shebang. I was just giving example

    your node_helper code was spawning python, not python3. I just copied what u did. u can put python3 in the spawn as well

    custom.css, doesn’t matter, it’s empty so no harm

    Sam

    How to add modules

    learning how to use browser developers window for css changes

    1 Reply Last reply Reply Quote 0
    • B Offline
      beejay22
      last edited by Aug 25, 2020, 2:48 AM

      Tried this (all I changed was “python” to “python3”):

      const spawn = require("child_process").spawn
      var NodeHelper = require("node_helper")
      
      module.exports = NodeHelper.create({
        socketNotificationReceived: function(notification, payload) {
          switch(notification) {
            case "GIVE_ME_DATA":
              this.job()
              break
          }
        },
        job: function() {
          var process = spawn("python3", ["/home/pi/Desktop/realTester.py"])
          process.stdout.on("data", (data)=>{
            console.log(data)
            var result = String.fromCharCode.apply(null, new Uint16Array((data)))
            this.sendSocketNotification("HERE_IS_DATA", data)
          })
        }
      })
      

      And also changed pyscript to this (just added python3 to the shebang):

      #!/usr/bin/python3
      from bs4 import BeautifulSoup                                             
      import requests                                                           
      
      url=requests.get("https://www.whitehouse.gov/presidential-actions/")      
      src=url.content                                                           
      soup = BeautifulSoup(src, 'lxml')
      for h2_tag in soup.findAll('h2'):
          a_tag = h2_tag.find('a')
          print(a_tag.string)
      

      Also tested “python” again (not python3) in my node_helper along with the updated shebang as shown above

      If custom.css file doesn’t matter I wonder why it’s giving this error… Have no clue what’s going on now lol

      S 1 Reply Last reply Aug 25, 2020, 3:51 AM Reply Quote 0
      • S Away
        sdetweil @beejay22
        last edited by sdetweil Aug 25, 2020, 3:53 AM Aug 25, 2020, 3:51 AM

        @beejay22 u need the fix for the data conversion… as well…

        custom.css cause its a file t=hat MM force loads, and while the browser is unhappy (thus the error), the MM runtime doesn’t care WHY there was no data, missing file, empty file, don’t care there were no css updates…

        i don’t do python so I can’t help much…

        but you gotta put in the fixes I gave you for data…

          process.stdout.on("data", (data)=>{
              console.log(data.toString()) // debugging, log string     
              //var result = String.fromCharCode.apply(null, new Uint16Array((data)))
              this.sendSocketNotification("HERE_IS_DATA", data.toString())   // pass the string, module expects string
            })
        

        Sam

        How to add modules

        learning how to use browser developers window for css changes

        1 Reply Last reply Reply Quote 0
        • B Offline
          beejay22
          last edited by Aug 25, 2020, 10:41 PM

          Sorry I copied the wrong node_helper.js file in my last post. This is how it looks like now:

          //node_helper.js
          const spawn = require("child_process").spawn
          var NodeHelper = require("node_helper")
          
          module.exports = NodeHelper.create({
            socketNotificationReceived: function(notification, payload) {
              switch(notification) {
                case "GIVE_ME_DATA":
                  console.log("received notification")
                  this.job()
                  break
              }
            },
            job: function() {
              var process = spawn("python3", ["/home/pi/Desktop/realTester.py"])
              process.stdout.on("data", (data)=>{
                console.log(data.toString())    
                this.sendSocketNotification("HERE_IS_DATA", data.toString()) 
              })
            }
          })
          

          I was trying to test if I can at least print something to magic mirror without a pyscript… node_helper looks like this:

          //node_helper.js
          const spawn = require("child_process").spawn
          var NodeHelper = require("node_helper")
          
          module.exports = NodeHelper.create({
            socketNotificationReceived: function(notification, payload) {
              switch(notification) {
                case "GIVE_ME_DATA":
                  console.log("received notification")
                  this.job()
                  break
              }
            },
            job: function() {
              var process = spawn("python3", ["/home/pi/Desktop/test.py"])
              process.stdout.on("data", (data)=>{
                data= "Hello World";
                console.log(data.toString())   
                this.sendSocketNotification("HERE_IS_DATA", data.toString())  
              })
            }
          })
          

          Hello World appears on MagicMirror but the test file that’s provided in the path (the test file just has: print(“this works”) does not so I’m not sure why I need to provide var process spawn if Hello World prints by itself… Anyways, I’m aware that there’s other ways to execute the child process however I’m not familiar with it. Please correct me if I’m wrong but can exec work in this situation as well? (pyscipt just prints out the latest titles when magic mirror restarts). I’m trying anything and everything at this point

          And I added the default and start function to my core module although I don’t think I have to use it. This is how it looks like now:

          /// MMM-Whitehouse.js - Core Module
          
          Module.register("MMM-Whitehouse", {
            defaults: {},
            start: function () {},
            getDom: function() {
              var e = document.createElement("div")
              e.id = "DISPLAY"
              return e
            },
            notificationReceived: function(notification, payload, sender) {
              switch(notification) {
                case "DOM_OBJECTS_CREATED":
                  var timer = setInterval(()=>{
                    this.sendSocketNotification("GIVE_ME_DATA")
                  }, 1000)
                  break
              }
            },
            socketNotificationReceived: function(notification, payload) {
              switch(notification) {
                case "HERE_IS_DATA":
                  var e = document.getElementById("DISPLAY")
                  e.innerHTML = payload
                  break
              }
            },
          })
          
          S 1 Reply Last reply Aug 25, 2020, 11:05 PM Reply Quote 0
          • S Away
            sdetweil @beejay22
            last edited by sdetweil Aug 25, 2020, 11:22 PM Aug 25, 2020, 11:05 PM

            @beejay22 I don’t understand why u have trouble.

            the 3 files I posted work together as u designed.

            does your spawn(‘/use/bin/python’, [execname]) work to return the data.
            console log to see

            spawn and exec have different methods of returning the data. see the doc

            Google search nodejs process spawn

            Sam

            How to add modules

            learning how to use browser developers window for css changes

            1 Reply Last reply Reply Quote 0
            • B Offline
              beejay22
              last edited by Aug 25, 2020, 11:21 PM

              Did you try it with the pyscript? Or are you talking about it the core module, node_helper and config?

              And okay

              S 1 Reply Last reply Aug 25, 2020, 11:24 PM Reply Quote 0
              • S Away
                sdetweil @beejay22
                last edited by sdetweil Aug 25, 2020, 11:25 PM Aug 25, 2020, 11:24 PM

                @beejay22 I am only working on inside MagicMirror

                the spawn on.data() gets called when the pgm launched outputs to stdout. my print hello

                of course I made sure the python script worked both ways, before showing that

                Sam

                How to add modules

                learning how to use browser developers window for css changes

                1 Reply Last reply Reply Quote 0
                • B Offline
                  beejay22
                  last edited by Aug 25, 2020, 11:30 PM

                  Okay. And yes it does return the data as output I believe

                  S 1 Reply Last reply Aug 26, 2020, 12:07 AM Reply Quote 0
                  • S Away
                    sdetweil @beejay22
                    last edited by sdetweil Aug 26, 2020, 12:11 AM Aug 26, 2020, 12:07 AM

                    @beejay22 do you see this output from the node_helper in the terminal window where you do npm start?

                    console.log(data.toString())

                    from your python script

                    Sam

                    How to add modules

                    learning how to use browser developers window for css changes

                    1 Reply Last reply Reply Quote 0
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