@IllyaMoskvin opened this Issue on May 2nd 2016

Apologies for the basic question. I'm trying to figure out the best way to end a visit session in Piwik using JavaScript. In Google Analytics, you would do the following:

ga('send', 'pageview', { sessionControl: 'end' });

For context, we would be using Piwik to track websites running on in-gallery tablets. A website is set running on a tablet continuously. We consider the session to have ended when no visitor interaction is recorded for three minutes. How would you accomplish something like this in Piwik?

Would you have to delete the session cookie manually? Then, would we need to re-initialize Piwik in a certain way, or would the session cookie be reset on the next Piwik call automatically?

I thought at first that the following function was the key:

setSessionCookieTimeout( seconds ) - the default is 30 minutes

...but I assume that it would timeout the cookie after seconds relative to the time the function was called, rather than relative to the last visitor interaction (i.e. trackEvent call). It would thus have to be called at each interaction to reset the timer. Can setSessionCookieTimeout be called in such a way? Or does it have to be loaded into _paq before Piwik is asynchronously retrieved, thus only being called once?

Alternatively, could I call setSessionCookieTimeout( 0 ) to immediately end the visit, or would that cause some sort of infinite loop where the visit counter is incremented indefinitely?

Lastly, does Piwik track visits only client-side using session cookies, or is there a server-side component to visit tracking as well?

I intend to keep looking into this problem and will share my solutions here. If asking this question is the sort of thing reserved for Piwik PRO users, then no worries, please feel free to close. If, however, this is a planned functionality, I'd be happy to help develop it.

References:

@tsteur commented on May 3rd 2016 Member

From what I can see by looking in the code there is actually no way to really force the creation of a new visit. This needs to be implemented and would be actually useful.

I don't think it's too hard to implement but we'll likely not be able to work on it soon. Would be a good feature for Piwik 3 at least

@mattab commented on May 27th 2016 Member

Thanks for the suggestion! Pull request would be very welcome :+1:

@rsirres commented on November 24th 2016

Wouldn't it enough to use setSessionCookie with an actual "session identifier" instead of the character '*'. (see https://github.com/piwik/piwik/blob/3.x-dev/js/piwik.js#L3885), This way we force a new visit by setting another session identifier.

Example

JS Tracker

function setSessionCookie() {
                var sessionUUID = now() + generateUUID();
                setCookie(getCookieName('ses'), sessionUUID, configSessionCookieTimeout, configCookiePath, configCookieDomain);
            }

The actual HTTP request would then look like:

http://piwik-server/piwik.php?action_name=View settings&url=http://mobileapp.piwik.org/window/settings &idsite=8876&rand=351459&h=18&m=13&s=3 
&rec=1&apiv=1&cookie=1&urlref=http://iphone.mobileapp.piwik.org&_id=af344a398df83874 &_idvc=19
&res=320×480&_session=<somerandomidentifier>

On the piwik backend, we would aggregate visits based on the session identifier (sessionUUID).

Note: Of course this only works when the client accepts cookies.

what do you think ?

@siva538 commented on September 27th 2019 Contributor

Wanted to share the recent investigation analysis on this, and would request @mattab / @tsteur to help with

1) Manually ending session (esp. when browser closed kind of a scenario)
2) Manually extending session (when there is no activity by the user watching a video in the application etc.)

For #1 - Manually ending session, we tried the following -

Delete the session cookie contents by setting setSessionCookie and expiration to -86400, so it immediately expires, and value to empty string.

_paq.push(['setSessionCookie', 'ses', '', '-86400']);

The main drawback or the challenge we faced was, while we are controlling the session cookie in the client side, the server side still continuing to work based on the predefined limit of visit length (30 mins or so) without honoring the session cookie state.

We also don't want to lose the main cookie id as it is the key thing for capturing the data for returning visits, else we would have chosen the path of delete cookies during the browser close etc OR whenever we wanted to end the session.

For #2 , manually extending session we tried two approaches:

Approach #1:

Tried with setting up Ping + SetSessionCookie, and as Igor mentioned in the other issue (#14897 ), there is no way we can extend the session with "Ping" as it is claimed in the documentation. Again as said above SetSessionCookie only controls the client side cookie expiration behavior but not the server side.

Though this option is implemented, we are not able to control the server side behavior of extending session, and hence resulting in creation of a new visit, when the session expires.

Approach #2:

So when there is a timer shown to the users and they manually select the extension of application session, we are forcing a specific action to be sent to the Matomo server (like pageview, download, click track, event track etc).

the resulting behavior is that the session is getting extended. However there is a downside of this approach. The base page whichever is viewed by the end user is supposed to get tracked on the amount of time spent on it, but the delta time from when the action is tracked, the time is marked for this latest action (be it event, or download, or link track etc).

Summary, it is serving the purpose of extending session, but data captured is incorrect.

Thanks a lot to you both and help prioritize this.

Regds,
Sivakumar

@mattab commented on September 29th 2019 Member

FYI it is possible to force the creation of a new visit, this is documented see
https://matomo.org/faq/how-to/faq_187/

To create a new visit on demand you can use the &new_visit=1 parameter in the Tracking API (see Reference docs).

(and also in other ways in https://matomo.org/faq/how-to/faq_19616/)

@siva538 commented on October 4th 2019 Contributor

Thanks @mattab , for your feedback on this. We are currently not using "UserID" feature and hence we won't be able to use "resetUserID" method.

For the "new_visit=1", we are aware of this functionality, however we won't be able to use this as the application can also be accessed using the deep links, and this cannot be attributed to a specific page as a starting point. i.e. end users can access any page that is allowed for them.

@siva538 commented on October 9th 2019 Contributor

Hello @mattab . We got some breakthrough on this one!

We have used sessionStorage to check whether the page has been tracked at least once or not, and accordingly handle the "new_visit" flag.

The limitation from the piwik.js file is that there is no way we can undo the addition of "new_visit=1" in the single page applications, i.e. undo the appending of "new_visit=1" from the second URL onwards.

To support that SPA flow, we are requesting you to allow the PR to add the below method to the tracker code.

New method:
this.removeFromTrackingUrl = function (queryString) { configRemoveFromTrackingUrl = queryString; };

Update getRequest method:

if (configAppendToTrackingUrl.length) { request += '&' + configAppendToTrackingUrl; } if (configRemoveFromTrackingUrl.length) { if(configAppendToTrackingUrl === configRemoveFromTrackingUrl) configAppendToTrackingUrl = ""; request = request.replace(new RegExp("&" + configRemoveFromTrackingUrl, "g"), ""); } if (isFunction(configCustomRequestContentProcessing)) { request = configCustomRequestContentProcessing(request); }

configRemoveFromTrackingUrl is a new member of the Tracker class.

Please let me know if you have any other questions.

Attaching the file for your reference.

piwik_modified.zip

Thanks a lot.

@mattab commented on October 10th 2019 Member

Hi @siva538 it's probably possible to add such a method :+1: But would it be possible to create a pull request so it can get reviewed? See: https://developer.matomo.org/guides/contributing-to-piwik-core for a guide to get started

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