websocketd | uses STDIN/STDOUT into a WebSocket server | Websocket library

 by   joewalnes Go Version: v0.4.1 License: BSD-2-Clause

kandi X-RAY | websocketd Summary

kandi X-RAY | websocketd Summary

websocketd is a Go library typically used in Networking, Websocket applications. websocketd has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

websocketd is a small command-line tool that will wrap an existing command-line interface program, and allow it to be accessed via a WebSocket. WebSocket-capable applications can now be built very easily. As long as you can write an executable program that reads STDIN and writes to STDOUT, you can build a WebSocket server. Do it in Python, Ruby, Perl, Bash, .NET, C, Go, PHP, Java, Clojure, Scala, Groovy, Expect, Awk, VBScript, Haskell, Lua, R, whatever! No networking libraries necessary.

            kandi-support Support

              websocketd has a medium active ecosystem.
              It has 16859 star(s) with 1013 fork(s). There are 366 watchers for this library.
              It had no major release in the last 12 months.
              There are 42 open issues and 278 have been closed. On average issues are closed in 171 days. There are 4 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of websocketd is v0.4.1

            kandi-Quality Quality

              websocketd has 0 bugs and 0 code smells.

            kandi-Security Security

              websocketd has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              websocketd code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              websocketd is licensed under the BSD-2-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              websocketd releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.

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            websocketd Key Features

            No Key Features are available at this moment for websocketd.

            websocketd Examples and Code Snippets

            No Code Snippets are available at this moment for websocketd.

            Community Discussions


            How do I send a message to my socket.io websocket from the command line in linux?
            Asked 2020-Apr-16 at 06:54

            Is it possible to send a socket.io message to my localhost server (node) using the command line in linux?

            My socket.io code looks like this:



            Answered 2017-Feb-07 at 23:43

            I was able to work around this by doing the following:

            1. Create a new endpoint in your server

            Source https://stackoverflow.com/questions/42101839


            How to handle the full set of websocket events in websocketd?
            Asked 2019-Dec-27 at 14:59

            I was looking at using websocketd as a web sockets server, but I don't see how it can be used to respond to the full set of websocket events such as onerror and onclose.



            Answered 2017-Jan-15 at 18:51

            What you're asking for is not how it works. You don't program websocketd and it doesn't have any events. You use as a stand-alone tool to wrap some other program and then each incoming connection starts an instance of the program you've configured it to wrap. Then, any incoming messages are send to stdin of that program and any stdout response from the program is sent back to the client that connected to the websocket server. You can think of it like a tool that just forwards incoming websockets messages to stdin of your app and captures the output and forwards that back to the client.

            As you presumably know, the idea is that without doing any server programming yourself, you could create a remote interface to any command line tool on your computer (with the associated caveats/risks that has) that expects to get its input from stdin and writes its output to stdout. That remote interface could be in a web page or could be any other program you write that uses a webSocket to communicate with the websocketd server you configured and ran on your host. So you only write the client-side of things. The websocketd doc does not say what it does with output that it finds on stderr.

            When a web socket client connects to this websocket server, an instance of your program will get started up. So, in essence, the onconnect event is that your program started. When the client disconnects, it will kill your program (that's essentially the onclose event).

            It is not clear what it does if it gets webSocket errors in sending data back to the client. You'd have to dissect the code here https://github.com/joewalnes/websocketd to try to figure that out (it appears to be written in go. Presumably, since it's a server itself and there's no interface, probably the most that happens is that the error is logged or maybe the webSocket is disconnected. Without modifying the code, there's no provision for you to participate in what happens when there's a webSocket communication error. The daemon has a preprogrammed behavior.

            I do see examples here in the code where it deals with errors from reading stdout and it logs those errors and then closes the stdout stream.

            The code here appears to close the incoming webSocket if it gets errors while reading from it.

            Source https://stackoverflow.com/questions/41658725


            How can I access of websocket using MIT App Inventor?
            Asked 2019-Oct-16 at 20:37

            Before asking my specific question my overall objective (in case there is a better way to do it) is to log data from a particulate matter sensor (PMS) with GPS co-ordinates on my ride to/from work to see how bad the air on my commute is.

            So far I have the PMS connected to a raspberry pi, and am recording values from it using a python script.

            I'm recording all these logged values to to a log.txt file following the process outlined here: https://www.perrygeo.com/raspberry-pi-real-time-sensor-plots-with-websocketd.html

            I've then set-up a websocket (using websocketd) from the pi, which I can access from my computer. This just spits out a current time-stamp, and the particulate matter reading I'm interested in (again following tutorial linked above).

            My question is how to access the data from this websocket in an Android App - ideally using MIT App Inventor 2 (as I'm a newb in Android). My google-fu has failed me on this one.

            I'm also happy to be told that a websocket is not the best way to do it - I could serve up a JSON file on a webpage instead and parse that from the android app if that'd be easier, but had thought a websocket would be better/faster.

            Having done a bit more research there is an extended discussion on this here: https://groups.google.com/forum/#!topic/ai4a/pL4bHmJKnH0 It's suggested that I might be able to use a socket rather than a web-socket - I'd also be happy to do that.



            Answered 2019-Oct-16 at 20:37

            Ok, it seems to do anything beyond the basics in MIT App Inventor 2 you need to add "extensions" which is what I was missing from my google search terms.

            Specifically the following extension did exactly what I was needing - hope it's of help to other people who stumble upon this question (including me in the future!):


            Finally I noticed that using the websocketURI with the host-name of the server machine (in my case raspberrypi did NOT work - I had to use the IP address. If anyone know why that might be and how to make the host-name discoverable on android please let me know!

            Source https://stackoverflow.com/questions/58402206


            How to send the output of a long running Python script over a WebSocket?
            Asked 2019-Aug-20 at 01:32

            A user uploads a python file that I need to execute on my server and send back the stdout that's created over a WebSocket. The python file that's executed will run for several minutes and I need to return the stdout over a socket as they are "printed" out in real-time, not at the completion of the script.

            I've tried using: Python. Redirect stdout to a socket, but that's not a WebSocket and my React frontend can't connect to it successfully. (if you can solve that, that would also solve my problem)

            I've also tried using websocketd but since I can't add sys.stdout.flush() after each of the users' added print statements it doesn't solve my problem.

            I've also tried using subprocess's PIPE functionality but that has the same flush issue



            Answered 2019-Aug-19 at 05:07

            This stand-alone example will

            1. Read a python script from a web socket
            2. Write the script to the file system
            3. Run the script with output buffering disabled
            4. Read the script output one line at a time
            5. Write each line of output to the web socket

            Source https://stackoverflow.com/questions/57541356


            How to display an image from WebSocket binary data?
            Asked 2019-Aug-15 at 15:48

            I am trying to test out Websocketd and hence want to transmit a image in binary

            My server-side used with websocketd:



            Answered 2019-Aug-15 at 15:47

            A simpler solution would be to put this in your server script:

            Source https://stackoverflow.com/questions/57494064


            JS setting attr(value) don't returning in DOM
            Asked 2018-Jul-23 at 21:37

            I'm using WebSocketd to send data and retrieve it form STDOUT, then using JS to access the message:



            Answered 2018-Jul-23 at 21:34

            As far as I am aware, setting the value of an input programmatically will not focus it, nor will it trigger a keyup event to trigger. You can, however, trigger the focus event or keyup event manually after the WebSocket sends a message. This may be what you're looking for;

            Source https://stackoverflow.com/questions/51487392


            Boost::beast: Multiple async_write calls are firing an assertion error
            Asked 2018-Jun-07 at 00:30

            I'm writing tests for my full-duplex server, and when I do multiple (sequential) async_write calls (although covered with a strand), I get the following assertion error from boost::beast in the file boost/beast/websocket/detail/stream_base.hpp:



            Answered 2018-Jun-06 at 23:39

            You said you cover your async_write with a strand. But you do no such thing. All you can be seen doing is wrapping the completion handlers in that strand. But you're posting the async operations directly.

            What's worse, you're doing it from the main thread, while there are async operations underway on any of the threads associated with your WSClient instances which means you're concurrently accessing object instances that aren't thread-safe.

            That's a data race, so you get Undefined Behaviour.

            A naive fix might be:

            Source https://stackoverflow.com/questions/50728059


            server.bash is not a valid win32 application
            Asked 2017-Jun-10 at 09:40

            I'm trying to host a simple (demo) websocketd server. Basically, it listens to incoming websocket connections and routes them towards my server. However, when I run the websocketd --port=8069 server.bash (In the correct directory, websocketd running as admin) I get the following error when trying to connect to ws://localhost:8069:



            Answered 2017-Jun-10 at 09:40

            Description of websocketd from the url you provided

            It takes care of handling the WebSocket connections, launching your programs to handle the WebSockets, ....

            So basically websocketd is trying to execute server.bash which doesn't work because windows doesn't recognize this file as executable. This script was probably meant to be run on linux in the first place however if you have installed bash already on windows u can try running it by replacing

            Source https://stackoverflow.com/questions/44471574

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install websocketd

            If you’re on a Mac, you can install websocketd using [Homebrew](http://brew.sh/). Just run brew install websocketd. For other operating systems, or if you don’t want to use Homebrew, check out the link below.
            To get started, we’ll create a WebSocket endpoint that will accept connections, then send back messages, counting to 10 with 1 second pause between each one, before disconnecting.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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