How to get topic in Realm_SessionCreated

[bharath3719]

private void Realm_SessionCreated(dynamic sender, WampSessionCreatedEventArgs e) { _logger.LogInfo("A session is opened. ID: " + e.SessionId.ToString());

        SessionManager.Instance.AddSession(new SessionInfo
        {
            SessionId = e.SessionId,
            UserName = e.HelloDetails?.AuthenticationId,
           // Topic = sender.TopicContainer.Topics[2] -- How can i get this value ? I see that sender's topic collection has an array Topics , which has the required value ,but position of the array value keeps chaning. Is there any other way to acheive the same ?

        }) ;
    }

[darkl]

Your realm has a TopicContainer which has methods like GetTopicByUri etc.

[darkl]

You can also register to TopicContainer.TopicCreated if you want to get a notification when a new topic has been created.

[bharath3719]

I want to know which user has subscribed to which topic.

Registering to TopicContainer.TopicCreated , i dont get sessionId in WampTopicCreatedEventArgs e to make a mapping..

[darkl]

Register to TopicCreated and there register to the SubscriptionAdded, SubscriptionRemoved events of the IWampTopic. Also consider using the WampMetaApi mechanism which keeps track of these for you.

Elad

[bharath3719]

Hi Elad,

In my case, i don't know the topics that my clients are going to subscribe to(it will be dynamic)

SubscriptionAdded is getting called the first time when we add authorizedTopics . (Correct me if im wrong)

When client(autobahn.js) initiates a connection with router with a user specific topic , SubscriptionAdded is not getting called.

helloDetailsand welcomeDetails in WampSessionCreatedEventArgs is not giving me the topic which the user has subscribed to.

And i hostedmetaAPI service like below: and there also i dont see which topic user has subscribed to

_metaApiService = _realm.HostMetaApiService();

[darkl]

You are wrong. These events are raised whenever a new topic is created, even if a client initiated the topic creation. You are probably not using the correct realm name on the server side. Another possibility is that you opened several WampHosts and you are looking at the wrong one.

The fact that the topics don't appear also in the meta-api service only suggests that you're looking at the wrong realm or the wrong WampHost.

Elad

On Thu, Feb 20, 2020, 07:46 bharath3719 notifications@github.com wrote:

Hi Elad,

In my case, i don't know the topics that my clients are going to subscribe to(it will be dynamic)

SubscriptionAdded is getting called the first time when we add authorizedTopics . (Correct me if im wrong)

When client(autobahn.js) initiates a connection with router with a user specific topic , SubscriptionAdded is not getting called.

helloDetails and welcomeDetails in WampSessionCreatedEventArgs is not giving me the topic which the user has subscribed to.

And i hostedmetaAPI service like below: and there also i dont see which topic user has subscribed to

_metaApiService = _realm.HostMetaApiService();

[image: image] https://user-images.githubusercontent.com/19222968/74934805-01d0f180-540d-11ea-8839-05214987534b.png

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[darkl]

If you want to continue discussing this and want my help please provide a standalone repro (a single minimal cs file) that doesn't work. Respect me and my time by using the bug template for issues that I set for this repository.

Elad

[bharath3719]

i have only one realm and wampHost.
where can i find bug template

[bharath3719]

i am getting below error if client initiates topic creation and if that topic is not there in authorizedTopics.

Potentially unhandled rejection [1] {"error":"wamp.error.not_authorized","args":[],"kwargs":{}}

[darkl]

When you open a new issue, choose the bug template.

Your current problem is that your clients are not allowed to subscribe to these topics. Implement a WampAuthorizer that allows them to subscribe by returning true from the CanSubscribe method. If you're using the built in WampCraDb implementation, maybe try using Prefix or Wildcard, I don't exactly remember the name.

[bharath3719]

looks like clients cannot subscribe to topics which are not in authorizedTopics list. Its fixed now . thanks for your inputs

[darkl]

authorizedTopics is not something that is defined in WampSharp, it is part of your code. Please be more careful with this in the future, I have no idea what is going on in your codebase.

Elad