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Add Supervisor::node_status notification event

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The Supervisor generates this event every time it receives a status update from
the stem, meaning a node got created or re-created. A corresponding
SupervisorControl::node_status event relays the same information for users
interacting with the Supervisor over Broker.
This commit is contained in:
Christian Kreibich 2022-05-30 12:41:39 -07:00
parent bdfa7e70f5
commit 14188fc7a7
9 changed files with 98 additions and 0 deletions
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11
scripts/base/frameworks/supervisor/api.zeek
View file

@ -150,4 +150,15 @@ export {
##
## msg: line-buffered contents from the stderr of a child process.
global stderr_hook: hook(node: string, msg: string);
## A notification event the Supervisor generates when it receives a
## status message update from the stem, indicating node has
## (re-)started.
##
## node: the name of a previously created node via
## :zeek:see:`Supervisor::create` indicating to which
## child process the stdout line is associated.
##
## pid: the process ID the stem reported for this node.
global node_status: event(node: string, pid: count);
}

12
scripts/base/frameworks/supervisor/control.zeek
View file

@ -91,4 +91,16 @@ export {
## process tree. There is no response to this message as the Supervisor
## simply terminates on receipt.
global SupervisorControl::stop_request: event();
## A notification event the Supervisor generates when it receives a
## status message update from the stem, indicating node has
## (re-)started. This is the remote equivalent of
## :zeek:see:`Supervisor::node_status`.
##
## node: the name of a previously created node via
## :zeek:see:`Supervisor::create` indicating to which
## child process the stdout line is associated.
##
## pid: the process ID the stem reported for this node.
global SupervisorControl::node_status: event(node: string, pid: count);
}

9
scripts/base/frameworks/supervisor/main.zeek
View file

@ -99,3 +99,12 @@ event SupervisorControl::restart_request(reqid: string, node: string)
local topic = SupervisorControl::topic_prefix + fmt("/restart_response/%s", reqid);
Broker::publish(topic, SupervisorControl::restart_response, reqid, res);
}
event Supervisor::node_status(node: string, pid: count)
{
if ( ! Supervisor::is_supervisor() )
return;
local topic = SupervisorControl::topic_prefix + "/node_status";
Broker::publish(topic, SupervisorControl::node_status, node, pid);
}