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Tracking the Subject

You may have additional information about your application's environment, current user and so on, which you want to send to Snowplow with each event.

Create a subject like this:

subject := sp.InitSubject()

The Subject class has a set of Set...() methods to attach extra data relating to the user to all tracked events:

  • SetUserId
  • SetScreenResolution
  • SetViewport
  • SetColorDepth
  • SetTimezone
  • SetLanguage
  • SetIpAddress
  • SetUseragent
  • SetDomainUserId
  • SetNetworkUserId

Tracking the Subject​

The Subject can be used into two ways.

When initialising the Tracker:

tracker := sp.InitTracker(
  sp.RequireEmitter(emitter),
  sp.OptionSubject(subject)
)

Or when you track an event:

tracker.TrackPageView(sp.PageViewEvent{
  PageUrl: sphelp.NewString("acme.com"),
  Subject: subject
})

When setting the Subject as you track as event, you will override the Tracker level Subject for that specific event.

Set user ID with SetUserId​

You can set the user ID to any string:

s.SetUserId( "{{USER ID}}" );

Example:

s.SetUserId("alexd");

Set screen resolution with SetScreenResolution​

If your code has access to the device's screen resolution, then you can pass this in to Snowplow too:

s.SetScreenResolution( {{WIDTH}}, {{HEIGHT}} );

Both numbers should be positive integers; note the order is width followed by height. Example:

s.SetScreenResolution(1366, 768);

Set viewport dimensions with SetViewport​

If your code has access to the viewport dimensions, then you can pass this in to Snowplow too:

s.SetViewport( {{WIDTH}}, {{HEIGHT}} );

Both numbers should be positive integers; note the order is width followed by height. Example:

s.SetViewport(300, 200);

Set color depth with SetColorDepth​

If your code has access to the bit depth of the device's color palette for displaying images, then you can pass this in to Snowplow too:

s.SetColorDepth( {{BITS PER PIXEL}} );

The number should be a positive integer, in bits per pixel. Example:

s.SetColorDepth(32);

Set timezone with SetTimezone​

This method lets you pass a user's timezone in to Snowplow:

s.timezone( {{TIMEZONE}} );

The timezone should be a string:

s.SetColorDepth("Europe/London");

Set the language with SetLang​

This method lets you pass a user's language in to Snowplow:

s.SetLang( {{LANGUAGE}} );

The language should be a string:

s.SetLang('en');

Set the IP Address with SetIpAddress​

This method lets you pass a user's IP Address in to Snowplow:

s.SetIpAddress( {{IP ADDRESS}} );

The IP Address should be a string:

s.SetIpAddress('127.0.0.1');

Set the useragent with SetUseragent​

This method lets you pass a user's useragent string in to Snowplow:

s.SetUseragent( {{USERAGENT}} );

The useragent should be a string:

s.SetUseragent('some useragent');

Set the Domain User ID with SetDomainUserId​

This method lets you pass a user's Domain User ID string in to Snowplow:

s.SetDomainUserId( {{DOMAIN USER ID}} );

The Domain User ID should be a string:

s.SetDomainUserId('domain-uid-12');

Set the Domain User ID with SetNetworkUserId​

This method lets you pass a user's Network User ID string in to Snowplow:

s.SetNetworkUserId( {{NETWORK USER ID}} );

The Network User ID should be a string:

s.SetNetworkUserId('network-uid-12');