def link_from(self, linking_view, linking_view_rows, visual, context_vars):
"""Dynamically show/hide links to other visuals (e.g. reports, dashboards, views) from views
This method uses the conditions read from the "link_from" attribute of a given visual to
decide whether or not the given linking_view should show a link to the given visual.
The decision can be made based on the given context_vars, linking_view definition and
linking_view_rows. Currently there is only a small set of conditions implemented here.
single_infos: Only link when the given list of single_infos match.
host_labels: Only link when the given host labels match.
Example: The visual with this definition will only be linked from host detail pages of hosts
that are Checkmk servers.
'link_from': {
'single_infos': ["host"],
'host_labels': {
'cmk/check_mk_server': 'yes'
}
}
"""
link_from = visual["link_from"]
if not link_from:
return True # No link from filtering: Always display this.
single_info_condition = link_from.get("single_infos")
if single_info_condition and not set(single_info_condition).issubset(
linking_view.spec["single_infos"]):
return False # Not matching required single infos
# Currently implemented very specific for the cases we need at the moment. Build something
# more generic once we need it.
if single_info_condition != ["host"]:
raise NotImplementedError()
if not linking_view_rows:
return False # Unknown host, no linking
# In case we have rows of a single host context we only have a single row that holds the
# host information. In case we have multiple rows, we normally have service rows which
# all hold the same host information in their host columns.
row = linking_view_rows[0]
# Exclude by host labels
host_labels = get_labels(row, "host")
for label_group_id, label_value in link_from.get("host_labels",
{}).items():
if host_labels.get(label_group_id) != label_value:
return False
return True
def cmp(self, r1, r2):
labels_1 = sorted(get_labels(r1, self.object_type).items())
labels_2 = sorted(get_labels(r2, self.object_type).items())
return (labels_1 > labels_2) - (labels_1 < labels_2)
