Stop subscribe mailbox with unknown error

[duongkha]

Hi,

I am trying to subscribe a mailbox to get new email coming and the application is running continuously to monitor the new email automatically. I use SubscribeToStreamingNotificationsOnAllFolders and StreamingSubscriptionConnection with timeout 30 minutes.

I also subscribe OnDisconnect event to reconnect by calling connection.Open();
and OnNotificationEvent to listen new email.

It was working very well for monitoring the new email in mailbox, however, it is stopped after running for a while (a day or some hours) without error alarm. I don't know when i will happen, just see it stops listen the new email. I have no idea if this is an issue of library or we need to do something extra to handle the case to re-connect to mailbox.

Could you please advise what i can do to fix the issue?

Thanks in advanced.

[gautamsi]

are you catching error on connection.Open() promise?

[duongkha]

No, i am not. I should catch error and call Open again,right?

[gautamsi]

first check what is the error it give, log it in console or in file to review later. if there is something I can fix that would help others

[soptimizer]

Hi, i have similar problem. When internet connection lost, i catch disconnect event. And i try reopen connection but i can not catch any error.

    conn.Open().then((err) => {
            console.log("error: " + err);
        });

Is this code true?

[gautamsi]

@soptimizer you can not do it this way, .then(success function, error function) is the syntax. You have to use 2nd parameter for exception in .then

if you are consuming ews-javascript-api@next then you can also use BlueBird's .catch.

[soptimizer]

@gautamsi thanks for fast response.
I tried code at the below, but not work for me.

    conn.OnDisconnect.push(() => {
        console.log("OnDisconnect : " + new Date() ); // is working
        conn.Open().then( function(success) {
                            console.log("OK : " + success)  // not working
                         },
                         function(error) {
                            console.log("ERR : " + error) // not working
                         },
                        );
        console.log("test text");  // not working
    });

In this code, conn.Open() is working. But after the ".then" function is not working.
I do not see any "success" message, neither "error" message nor "test text" message.

[duongkha]

this is what i do and works for me.
$q(connection.Open())
.then(function(success){
console.log("ews connected.");
},
function(error){
console.log("ews connection error.");
console.log(error);
});

[gautamsi]

@duongkha did you receive any error in the error block?

[duongkha]

Yes. the error is "'You must add at least one subscription to this connection before it can be opened.'"

I guess that it happened inside your code that the subscription somehow is disappeared.
It is not happening often, but it can happen at any time, some hours or a day since my app is always running to listen new email.

[soptimizer]

I tried q promise and it works. Success function was called. But when i lost the internet connection, error function was not called. So i can not handle net connection error.

Do you have a suggestion for me?

[gautamsi]

I will take a look on this sometime this week.

[duongkha]

what i am trying to do is dispose the current connection and create new connection with subscription, it seems to be working now. but let's see if it is stopped working for long run or not.

[soptimizer]

@duongkha How do you catch "disconnection"? In my code when i disconnect the connection, "OnDisconnect" is working correctly. In this situation, I call conn.Open() but I can not receive any error.

[duongkha]

i also subscribe Disconnected event and reconnect again only.

[duongkha]

@gautamsi : I tried to set the timeout to 1 minutes of subscribing the mailbox. however, i recognized that sometimes, it called to reopen the connection and it failed, nothing response with Open() call. What should we do when the Open is failed? Should we recall Open again?