go-websocket | Demonstrate golang & # 39 ; s websocket | Websocket library
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kandi X-RAY | go-websocket Summary
Demonstrate golang's websocket
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QUESTION
Is there any way to find out if a running function was called as goroutine or not?
I've read 'go tour' and I am interested in building a websocket server with golang, so I found this tutorial https://tutorialedge.net/golang/go-websocket-tutorial/
Now I'm wondering if wsEndpoint function from the tutorial is invoked as goroutine (e.g. go wsEndpoint(...)) or not.
I've tried to read http package documentation, but did not get clear picture, just a guess that the handler will be called with go routine. Is that true?
...ANSWER
Answered 2019-Jun-21 at 14:00Every function is called from a goroutine, even the main() function (which is called the main goroutine).
And goroutines in Go have no identity. It does not matter which goroutine calls a function.
To answer your "original" question:
Is there any way to find out if a running function was called as goroutine or not?
If we define this as the function being called with the go statement or without that, then the answer is yes: we can check that.
But before we do: I would not use this information for anything. Don't write code that depends on this, nor on which goroutine calls a function. If you need to access a resource concurrently from multiple goroutines, just use proper synchronization.
Basically we can check the call stack: the list of functions that call each other. If the function is at the top of that list, then it was called using go (check note at the end of the answer). If there are other functions before that in the call stack, then it was called without go, from another function (that places before in the call stack).
We may use runtime.Callers() to get the calling goroutine's stack. This is how we can check if there are other functions calling "us":
QUESTION
I am working on a django based project where we now intend to add some realtime capabilities to send data to the connected clients and refresh the UI as and when required. The framework being used to build the frontend is Angular6 and we are kinda new to Angular.
I know how to use channels to send and receive data. But, even after considerable searching, I am still unable to find any good material on how to setup and make an Angular app consume the data thrown by the django channels.
In a nutshell how to make djangochannels and an angular app work together.?
What I found Already:
http://devarea.com/angular-and-django-websockets-communication/#.XGwHiaIzbIU
Above link explains how to do what I want but its not clear which code goes where and what are the imports required etc.
Would be great If some one is able to explain/correct it or may be suggest a better or easier approach.
Thanks in advance
...ANSWER
Answered 2019-Feb-20 at 20:18Django channels implements the server side of the websocket protocol in a fairly generic way. So, you don't need any special Angular setup for Channels. While there is a channels js to make it easier to communicate with the websocket, the protocol is still very much the same and you can use the vanilla js websocket client. The js lib itself is deprecated since channels 2.0
So what you should really be looking for is how to implement a websocket client in Javascript if you don't already know that
QUESTION
I am trying to redirect traffic from Apache to Tomcat on CentOs server by using mod_proxy and mod_proxy_wstunnel modules. HTTP traffic is redirected without problems but I am not able to successfully redirect websocket traffic with any configuration I tried so far. It gives me 200 response code instead of 101.
I have read a lot of similar questions, but haven't find any solution yet. These one have similar problems. Question 1, Question 2
I'm using Apache Server 2.4.6 - > Apache Tomcat 7.0.92 - > Java Application with Spring and javax socket implementation.
Here is my modules:
Here is my httpd config:
...ANSWER
Answered 2019-Feb-06 at 13:10Finnally, i have done it.
In my case, there is no need to put RewriteConds and RewriteRules. All was need is to proxy request to actual backend (Apache Tomcat) by adding into httpd.conf
QUESTION
I am new to WebSocket world and even after a week, I still could not find how to use it with PHP without using any 3rd Party Library. Or not sure if it is even possible.
I have 3 questions,
1) Do we must need to use some 3rd Party APIs or Libraries like Ratchet, PHP-Push-WebSocket or PHP WebSocket to enable PHP to communicate over WebSocket protocol?
2) If your answer to above question is yes then what is the advantage/purpose of using Apache's mod_proxy_wstunnel?
3) If I use any PHP WebSocket 3rd Party Library, then do I still need to enable and use Apache's mod_proxy_wstunnel? If No, then again what is the purpose of Apache's mod_proxy_wstunnel?
I went through this Using go-websocket behind Apache mod_proxy_wstunnel. In this question, the OP has indicated some go-websocket but unfortunately the link is giving 404 Error and hence I cannot understand if the user has used any 3rd Party API.
Any help would be highly appreciated. Thanks in advance.
...ANSWER
Answered 2017-Oct-14 at 12:29PHP is not created for WS. Of course you can do this, but it is full of while (true) and fsock_open [*]. And you have to have access to the shell to run the WS-server with php-cgi. (usually)
Choose a language that supports threads / asynchronous communication. Now on the top is Node.js. In addition, better use dedicated libraries to support older browsers, etc. If you are thinking about alternatives to ajax then you can use socket.io. If you want to create one-to-all communication (eg chat, broadcast messaging), go one step further and use one of the Bayeux implementations, for example: Faye.
The mod_proxy_wstunnel extension adds an extra layer to the WS server. Depending on the configuration, it can support DDoS, queue, load-balancing, local port swapping, and https support. But better use this for nginx.
So, for test you don't need mod_proxy_wstunnel, and on production, you should add an extra layer of security, eg NGINX ws tunelling.
[*] Sorry, I made some mistakes. PHP has native support for WebSockets. That content is going to set you negatively to WS in PHP.
Websockets are events, and PHP is poorly managed with it.
QUESTION
I'm in the process of learning how to use websockets with django, I'm using django-websocket and here's a quick link to how they recommend setting it up https://django-websocket-redis.readthedocs.io/en/latest/api.html#use-redispublisher-from-inside-django-views
I've setup redis and it's working okay, I've also got this view to send requests
...ANSWER
Answered 2017-Aug-19 at 21:44Check your class RenderView()
the super class instantiation should be :
QUESTION
I'm having issues running 2 vassals in emperor mode (for a main app + websocket) behind an nginx server. Everything seems to be running well, but all the websocket requests return error 502 bad gateway. The websocket app is running django-websocket-redis. Any ideas where I went wrong?
Running from upstart
...ANSWER
Answered 2017-Mar-21 at 16:40I needed to set
QUESTION
I'm using django-websocket-redis and have this in my settings.py:
...ANSWER
Answered 2017-Jan-18 at 13:55TL;DR: you have to override default Redis connection settings of ws4redis
I've bumped into this when I was implementing custom Django command, which was supposed to send a websocket message on certain server-side events.
If you look at the source code of RedisPublisher class, you will notice this line at the very top:
redis_connection_pool = ConnectionPool(**settings.WS4REDIS_CONNECTION)
while comments for ConnectionPool.__init__() state following:
By default, TCP connections are created connection_class is specified. Use
redis.UnixDomainSocketConnectionfor unix sockets.
So when you're instantiating RedisPublisher it uses ConnectionPool which, by default, does not know anything about sockets. Therefore 2 approaches are possible:
- Switch default
ConnectiontoUnixDomainSocketConnectioninConnectionPoolinstantiation or - Substitute
ConnectionPoolwithStrictRedisconnection which has built-in capabilities to use unix socket (named argumentunix_socket_path).
This is how I solved it using 2nd approach (it appears cleaner for me):
QUESTION
I have already looked at this question and various others on both SO and related sites, but none of the solutions suggested so far have worked.
I am running tty.js on localhost:8080 and verified that websockets work correctly when hitting that port directly. Now, I am attempting to connect to tty.js through an Apache reverse proxy. The application can work without using Websockets, but I am trying to understand why Websockets do not work.
Here is my Apache configuration for testing on localhost with a fresh Apache build from source.
ANSWER
Answered 2017-Jan-03 at 05:30After several hours of running Apache in a debugger, I discovered that Apache was faithfully passing all the requests that matched the given path through mod_proxy, including the following one.
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