The SignalR user session ends after changing the page. A new session opens on the new page.
I need a connection that will continue as long as I log out of Hub.
As far as I know, when you connect the signalR hub server, it will generate a connectionID.
Each new session will use specific connectionid, we couldn't modify the conenctionid when you used the new session.
If you want to let all the tab connect as one user account, you could try to check the username when the connection started and then store the username and connectionid as one to more in the server memory or else.
Then if other user send message to this user, you could get the connectionid according to the username and use Clients.Client(conid).SendAsync method to send the request.
More details about how to achieve it, you could refer to this reply.
Related
I'm trying to build a chat engine whereby users id are represented by their connection id. On page refresh, the connection id changes when a new connection is instantiated. Is there a way to persist the state of the connection id of a user until he closes the browser (i.e until he ends his session on client)., plz provide me solution. thanks
By design, SignalR will assign a new connection id to every new connection, so connection ids cannot be reused.
To achieve what you want, you should authenticate your users so they can be "represented" in your client by their actual id (user id rather than connection id)
I am the new for FCM. Here are some questions about the registration token:
Is the registration token generated by the FCM connection server?
Does the token change periodically in the connection server?
When?
Will it force the onTokenRefresh() in the app to be called?
I have googled for a week but didn't get any details. Please help. Thanks.
1. Is the registration token generated by the FCM connection server?
No. It gets generated by the FirebaseInstanceID. The way I understand the flow of event on first time registration:
The app retrieves a unique Instance ID.
The registration token is generated by calling the InstanceId.getToken().
Developer (usually) sends the token to the App Server.
2. Does the token change periodically in the connection server?
I think the onTokenRefresh() docs pretty much answers this.
Called when the system determines that the tokens need to be refreshed. The application should call getToken() and send the tokens to all application servers.
This will not be called very frequently, it is needed for key rotation and to handle Instance ID changes due to:
App deletes Instance ID
App is restored on a new device
User uninstalls/reinstall the app
User clears app data
The system will throttle the refresh event across all devices to avoid overloading application servers with token updates.
See this part of the docs for more details.
Scenario: I am working on website in which user login and do some tasks and logout. When user login in website I put a true value in database so other user is not logged in with the same username and password.
Problem: Above scenario was working fine. But I a face problem when unexpectedly PC was shutdown and that true value is there which I put in database on the first time when user login in my website. And the first user is unable to again logged in from same PC.
What I want: I need a mechanism in asp.net in which When unexpectedly PC was restarted / shutdown server automatically update my column in sql.
You can't use server code to monitor client machine behavior.
I suggest you re-design the database with a expiring time session, which will handle the login event when "true" value is on but user try to login again.
Another the way could be allowing users to "unlock" themselves, by email-reset token, or by secret password.
When user login in website I put a true value in database so other
user is not logged in with the same username and password.
It is not a good design, because internet is not reliable. You are very closed; instead of Boolean value in database, you want to store a token.
Solution
You need to redesign the system based on cookie (or you can also use bearer token).
When a user login, create a new token and store it in both database and cookie.
When a user request a page, validate submitted cookie with the one in database. If they are not same, ask the user to re-login again.
I need a mechanism in asp.net in which When unexpectedly PC was restarted / shutdown server automatically update my column in sql.
SignalR can help. On your website you have a HUB, that hub can detect when users connect or disconnect. Just map when disconnect is called and set that user in the database to false.
I agree with previous comments that it's a poor design. But SignalR can work around that for you.
http://www.asp.net/signalr
Following is the scenario I want to achieve using signal R.
If sending of email is going on then message will get display
Example: "Sending Email.."
Once email sending is done will show the another message to the same user stating
Example: "Email Sent successfully."
How I will achieve this with Signal R and sending the notification to the one user only.
Read the post which are saying use Connection Id but that will be changing not a fix
I want to do this for the Authorized user only or we can say with static userid.
I see two different approaches to the problem, with two different solutions. Either the server keeps track on which connectionId(s) that belong to a particular user. Or the client lets the server know which connectionId to use.
Option 1: Server knows how to map user to connectionId(s)
Firstly you need to map each user to the connectionId(s) they have. Bear in mind that the user could have several connectionIds as he/she could be logged on in multiple tabs or browsers. On the server it is difficult to distinguish between connections so when the user sends an email, it is easiest to notify on all connections that belong to that user.
There are several ways to keep track of users connectionIds. Here is a good walk through. In your case I think the UserID provider option would be a good fit, as it's easy to implement and sufficient if you only want to send updates to the current user.
Option 2: Client notifies server on connectionId to use
Another approach could be to include the connectionId in the call to the server. That way the server knows which connection to report back to. You can get the connectionId in Javascript (as described in this answer) using:
var c_id = $.connection.hub.id
Hope this helps!
I would like to know if is possible to create a chat for private conversation like gmail chat or hotmail..
How can I ensure that only client A talks with client B?
How can I ensure that only logged clients can talk?
Sure, you can create a unique "Group" each time a user initiates a chat with another user (or set of users). Then when you send messages to that group only those users would receive the message. You could also layer more security in front of sending messages to a group to ensure that the person sending the message is allowed to send a message to that group.
Try this application for Private chat with SignalR
Description of Application:
http://www.aspbucket.com/2016/03/implement-of-private-one-to-one-chat.html
Download link
https://github.com/shivam01990/SignalR-private-one-to-one-chat
Look at ChatWithTracking in Basic chat sample, that's a great starting point for IM setup
p.s: updated the link; using a search query in case they change the repo structure again
Each client connecting to a hub passes a unique connection id. You can retrieve this value in the Context.ConnectionId property of the hub context. If your application needs to map a user to the connection id and persist that mapping, you can use one of the following:
In-memory storage, such as a dictionary
SignalR group for each user
Permanent, external storage, such as a database table or Windows Azure table
http://www.asp.net/signalr/overview/hubs-api/mapping-users-to-connections