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    Import javascript library

    Scripting general Discussion
    scipting javascript
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    • A
      arvand.owji @phildunlap
      last edited by

      @phildunlap Thanks. I tried it and it instantly made my Mango Server to crawl to the point that i had to unplug and plug t back. It wasnt anything overly complicated. Something like:
      load('http://whatever.js'); //about 7mb
      var S=Module.SomeFunction('x','y','z'); //this is a function defined in the js i just loaded

      Question 1: I suspect it was because i was referencing the the javascript over http and because of its size it was taking to long to load. Any thought?

      Question 2: If i want to print the value of S in the log file, can i simply say print(S)? I couldnt try it as the script was not running properly.

      Thanks.

      1 Reply Last reply Reply Quote 0
      • phildunlapP
        phildunlap
        last edited by

        Hi arvand,

        I couldn't tell you what performance you should expect from an unknown library. Local loading might help. You can wget it or whatever you like and then load it locally and test.

        My inclination for a slow run would be to wonder... 1) How much memory was available before the JavaScript ran? How much did it consume? What is the library trying to do? 2) How often is the meta point running? Did you only test it with the validate button, or was it running 0/1 * * * * ??

        The print() function will only work in the browser. If you want it logged, you have to use the LOG object as described: https://help.infiniteautomation.com/about-mango-java-script/#logging

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        • A
          arvand.owji
          last edited by

          Thanks a lot. You have been very helpful. Now when i try to run the script (either through validate button or running in on a cron job) i get a memory error in ma.log.
          java.lang.IllegalStateException: Timer already cancelled.
          ....
          com.serotonin.m2m2.web.dwr.util.ExceptionDetectionFilter.doFilter:38) - DWR invocation exception
          java.lang.OutOfMemoryError: GC overhead limit exceeded
          ...
          ERROR 2017-07-10 16:43:13,852 (com.serotonin.m2m2.web.dwr.util.ExceptionDetectionFilter.doFilter:38) - DWR invocation exception
          java.lang.OutOfMemoryError: Java heap space

          My box has 1gb of memory allocated (memory-small.sh is enabled). When not running my script, under internal metrics, i see my available memory is 855 and jvm max available is 889. Also when i ssh into the box, i see this info about the memory:
          Ram Info:
          total used free shared buffers cached
          1.9G 1.7G 203M 99M 31M 304M

          in my script, im not even trying to do anything. Just loading a coolprop library (http://www.coolprop.org/coolprop/wrappers/Javascript/index.html#javascript) and it gets the memory error. coolprop is about 6mb.
          LOG.trace('Start');
          load('/opt/mango/web/resources/coolprop.js');
          LOG.trace('End');

          Any thoughts? Thanks.

          1 Reply Last reply Reply Quote 0
          • phildunlapP
            phildunlap
            last edited by

            Huh.

            Testing it on my machine, here's what I get as a profile of my Mango. Nothing is enabled, I just hit the script validate button on a single line loading coolprop.js

            One thing I noticed is that coolprop threw an exception when it did load, so you'll have to do something more to get the script as it will need to be (no read function was the error I was seeing). But, check out this memory chart:

            0_1499723826954_heapSize.png

            The first massive jump is the first time I loaded coolprop.js. Then I hit validate a few more times, and no real change. Then I triggered a manual garbage collection in the deep valley in the middle, then hit validate again. It looks like you options will be to try and figure out why it is so massive (tough to say from what I'm seeing.... looks like it just assigns tons and tons of variable names, which seems like it should never get to the size it is), or try to allocate enough memory to avoid the issue.

            A 1 Reply Last reply Reply Quote 0
            • A
              arvand.owji @phildunlap
              last edited by

              @phildunlap Thank you. At the moment is not possible for me to increase my memory. I need to get a bit creative here and see how I can go around this and do my calculation. One option i can think of is to create an external webpage (residing on the same server) and have the javascript to run there. I need to be able to pass data and retrieve data from it and I know that XMLHttpRequest is not supported. So instead of using script, i guess i have to use an http receiver data source to call my page url.

              • Is there anyway to simply pass data points to this url? if not, then, within my webpage, i have to connect to the mango database and retrieve the data i need and do the required calculation. Is this even possible?
              • It seems to be much easier to send the data back to Mango. using the above http receiver i can setup data points to capture the returned data from the webpage response

              Am i even on the right track? What other things can i do here? Thanks.

              1 Reply Last reply Reply Quote 0
              • phildunlapP
                phildunlap
                last edited by phildunlap

                What you're talking about is possible, but not especially clean (having something like node.js makes plenty of sense, opening a browser doesn't).

                If you had a webpage open, and it had loaded coolprop and somehow no memory issues occurred in that version despite being the same device opening the webpage (edit: or you're using some other JavaScript engine, or node.js, etc), you could write that webpage to subscribe to a point value web socket (or just poll a data point if you prefer) and then return the computed points as a PUT to /rest/v1/point-values (you can explore the endpoints in swagger, but I suspect you'd want the multiple update endpoint). So, both the retrieval and the return of values should be taken care of in that webpage through the API.

                Other alternatives are figuring out how to prevent it from allocating such a chunk of memory when loaded (but alas I couldn't find a non-minified version of the script), or using another of their libraries and seeing if that works, For instance, you could use the python library on the server, then use the SSH data source when you need to invoke the library.

                A 1 Reply Last reply Reply Quote 0
                • A
                  arvand.owji @phildunlap
                  last edited by

                  @phildunlap said in Import javascript library:

                  point value web socket

                  Do you have an example of a webpage that interacts with Mango point value using a web socket? Thanks.

                  Jared WiltshireJ 1 Reply Last reply Reply Quote 0
                  • Jared WiltshireJ
                    Jared Wiltshire @arvand.owji
                    last edited by

                    @arvand.owji
                    Lots of the Mango UI pages do this. e.g. Data Point Details or Watch List

                    Developer at Radix IoT

                    1 Reply Last reply Reply Quote 0
                    • A
                      arvand.owji
                      last edited by

                      So i created an internal data source and also added a data point for that data source. Now when i try to edit that data point using MangoAPI.defaultApi.putValue(xid, pvt) (**running on a seperate webpage but on the same server)i get an error that the data point is not settable. inside the DP, all i see for "set permission" is blank, Admin and super admin. How can i set me DP permission to be able to set it from outside? Am i even right to use an internal data source for this purpose? All i need is an arbitrary datapoint that i can be able to set it from outside. Maybe i have to use http data source instead?

                      1 Reply Last reply Reply Quote 0
                      • phildunlapP
                        phildunlap
                        last edited by

                        Hi Arvand,

                        You would rather use a virtual data source for that purpose. The internal data source is for gathering information on how Mango or the system are running.

                        A 1 Reply Last reply Reply Quote 0
                        • A
                          arvand.owji @phildunlap
                          last edited by

                          @phildunlap said in Import javascript library:

                          Hi Arvand,

                          You would rather use a virtual data source for that purpose. The internal data source is for gathering information on how Mango or the system are running.

                          Thanks and it worked. I can now Get data and then set them in my webpage.
                          Im encountering a new problem now. I created a http data retriever and passed my webpage address as the data source url . I set the update time to 5 minutes and when I save/enable the data source i get the following error:
                          INFO 2017-07-17 14:41:34,313 (com.serotonin.m2m2.rt.RuntimeManager.stopDataSource:383) - Data source 'CoolPropRet' stopped
                          INFO 2017-07-17 14:45:03,419 (com.serotonin.m2m2.rt.RuntimeManager.initializeDataSourceStartup:351) - Data source 'CoolPropRet' initialized
                          INFO 2017-07-17 14:45:03,423 (com.serotonin.m2m2.rt.RuntimeManager.initializeDataSourceStartup:356) - Data source 'CoolPropRet' took 33.553523ms to start
                          ERROR 2017-07-17 14:45:03,424 (com.serotonin.m2m2.web.dwr.util.ExceptionDetectionFilter.doFilter:38) - DWR invocation exception
                          java.lang.IllegalStateException: Timer already cancelled.

                          A 1 Reply Last reply Reply Quote 0
                          • A
                            arvand.owji @arvand.owji
                            last edited by

                            Hi All,
                            Any chance we know why i'm getting the above error? Thanks.

                            1 Reply Last reply Reply Quote 0
                            • phildunlapP
                              phildunlap
                              last edited by

                              Hi Arvand,

                              Off hand I'm not quite sure. Can you possibly share the JSON for the HTTP Retriever data source that you are experiencing this with? Export it from the row in the table of data sources on /data_sources.shtm so that it also exports its points.

                              A 1 Reply Last reply Reply Quote 0
                              • A
                                arvand.owji @phildunlap
                                last edited by

                                @phildunlap said in Import javascript library:

                                Hi Arvand,

                                Off hand I'm not quite sure. Can you possibly share the JSON for the HTTP Retriever data source that you are experiencing this with? Export it from the row in the table of data sources on /data_sources.shtm so that it also exports its points.

                                Maybe im not using the right tool. I wrote a webpage that uses mango api to retrieve bunch of DPs and and then set some DPs. What i'm trying to do is to use the HTTP retriever to act like a cron job and simply send a request to that url every X minutes. I dont really care whats being oasses ot that url or what that url returns. Here is the datasrouce export. I removed the website name from the url but i have validated that the mango box has access to the url (i can ping the host from command prompt.

                                {
                                "dataSources":[
                                {
                                "xid":"DS_608664",
                                "name":"CoolPropRet",
                                "enabled":true,
                                "type":"HTTP_RETRIEVER",
                                "alarmLevels":{
                                "DATA_RETRIEVAL_FAILURE":"URGENT",
                                "POLL_ABORTED":"URGENT",
                                "SET_POINT_FAILURE":"URGENT",
                                "PARSE_EXCEPTION":"URGENT"
                                },
                                "purgeType":"YEARS",
                                "updatePeriodType":"MINUTES",
                                "quantize":false,
                                "retries":2,
                                "setPointUrl":"",
                                "timeoutSeconds":30,
                                "updatePeriods":2,
                                "url":"http://www.MYWEBSITE.COM:85/coolprop4.html",
                                "editPermission":"",
                                "purgeOverride":false,
                                "purgePeriod":1
                                }
                                ],
                                "dataPoints":[
                                ]
                                }

                                A 1 Reply Last reply Reply Quote 0
                                • A
                                  arvand.owji @arvand.owji
                                  last edited by

                                  I also just tried http://192.168.1.125/coolprop4.html as the url and i got the same error.

                                  1 Reply Last reply Reply Quote 0
                                  • phildunlapP
                                    phildunlap
                                    last edited by

                                    Hmm. Can you try clearing your browser cache (ctrl + shift + delete in Chrome) and deleting your Mango/work/jsp directory, then trying again?

                                    A 1 Reply Last reply Reply Quote 0
                                    • A
                                      arvand.owji @phildunlap
                                      last edited by

                                      @phildunlap said in Import javascript library:

                                      Hmm. Can you try clearing your browser cache (ctrl + shift + delete in Chrome) and deleting your Mango/work/jsp directory, then trying again?

                                      ia have bunch of stuff in /opt/mango/work/jsp. is it ok to delete them?

                                      1 Reply Last reply Reply Quote 0
                                      • phildunlapP
                                        phildunlap
                                        last edited by

                                        Yeah those are compiled JSPs. It will recompile them when the pages are loaded if you delete that.

                                        A 1 Reply Last reply Reply Quote 0
                                        • A
                                          arvand.owji @phildunlap
                                          last edited by

                                          @phildunlap my permission doesnt let me to delete them. I dont have the SU password. I tried to go another route and see if ican just invoke this from linux command prompt. "curl -ls http://xxxxxxxx". It didnt work and prompt me to try the url in another browser and there i realzied that im getting error "MANGO XHR access failed". It seems im not login and doesnt let me to make any changes (which is a good thing). How can i easily login without going through the REST API. is there anyway to login from MangoAPI jquery?

                                          1 Reply Last reply Reply Quote 0
                                          • phildunlapP
                                            phildunlap
                                            last edited by phildunlap

                                            I think you're looking for this page: https://help.infiniteautomation.com/mango-rest-api-authentication/

                                            If this is an ES you can sudo using the regular user's password to sudo su, you don't need to su root.

                                            A 2 Replies Last reply Reply Quote 0
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