mirror of
https://github.com/outbackdingo/sysadm.git
synced 2026-01-27 18:20:23 +00:00
7ec47963ac
- Whitespace fixes. - Reworking text. - Reducing the size of tables for better PEP8 conformity. - Altering admonition box titles (use tip and danger). - Update roles (use :guilabel: and verify other uses).
276 lines
7.0 KiB
ReStructuredText
276 lines
7.0 KiB
ReStructuredText
.. _Events:
|
|
|
|
Events
|
|
======
|
|
|
|
The "events" namespace can be used to setup and receive asynchronous
|
|
updates about system status and other types of system notifications.
|
|
|
|
.. warning:: The events namespace does not really translate over to REST
|
|
which was not designed for asynchronous events. For this
|
|
reason, only Websocket examples are used in this section.
|
|
|
|
Every events request contains several parameters:
|
|
|
|
+---------------+-----------+--------------------------------------+
|
|
| **Parameter** | **Value** | **Description** |
|
|
| | | |
|
|
+===============+===========+======================================+
|
|
| id | | Any unique value for the request, |
|
|
| | | including a hash, checksum, or uuid. |
|
|
+---------------+-----------+--------------------------------------+
|
|
| name | | Supported values are "subscribe" or |
|
|
| | | "unsubscribe". |
|
|
+---------------+-----------+--------------------------------------+
|
|
| namespace | events | |
|
|
| | | |
|
|
+---------------+-----------+--------------------------------------+
|
|
| args | | Values vary by type of class. |
|
|
| | | |
|
|
+---------------+-----------+--------------------------------------+
|
|
|
|
Subsystems can also be tracked using the events namespace. Currently,
|
|
there are three trackable subsystems: Dispatcher, Life Preserver, and
|
|
System State. Use the template to subscribe to various subsystem event
|
|
notifications:
|
|
|
|
**Websocket Request**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "subscribe",
|
|
"id" : "sampleID",
|
|
"args" : ["dispatcher", "life-preserver", "system-state"]
|
|
}
|
|
|
|
Once subscribed, events will be received as they are produced. To
|
|
unsubscribe from events, repeat the request, using "unsubscribe" for the
|
|
"name".
|
|
|
|
Here is an example reply from the Life Preserver subsystem:
|
|
|
|
**Websocket Reply**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "life_preserver",
|
|
"id" : "<none>"
|
|
"args" : {
|
|
"message" : "<message>",
|
|
"priority" : "<number>/<category>",
|
|
"class" : "[snapshot/replication]"
|
|
}
|
|
}
|
|
|
|
Dispatcher
|
|
----------
|
|
|
|
The Dispatcher subsystem is used by SysAdm™ to process external commands
|
|
and return specific information from the utility. This is managed on the
|
|
server as a separate process, and will not interrupt primary server
|
|
tasks. To subscribe to the Dispatcher subsystem for event updates, use
|
|
the following:
|
|
|
|
**Websocket Request**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "subscribe",
|
|
"id" : "sampleID",
|
|
"args" : ["dispatcher"]
|
|
}
|
|
|
|
The Dispatcher event log will display three different states: "pending",
|
|
"running", and "finished". Depending upon the current state, the log can
|
|
change in some minor but noteworthy ways. The following sample logs will
|
|
reflect the differences between these states:
|
|
|
|
**Dispatcher Response: "Pending" state**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "dispatcher",
|
|
"id" : "none",
|
|
"args" : {
|
|
"state" : "pending",
|
|
"cmd_list" : ["<command 1>", "<command 2>"],
|
|
"process_id" : "<random>"
|
|
}
|
|
}
|
|
|
|
**Dispatcher Response: "Running" state**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "dispatcher",
|
|
"id" : "none",
|
|
"args" : {
|
|
"state" : "running",
|
|
"cmd_list" : ["<command 1>", "<command 2>"],
|
|
"process_id" : "<random>",
|
|
"time_started" : "<ISO 8601 time date string>",
|
|
"current_cmd" : "<command 2>",
|
|
"<command1>" : "<log after running command1>",
|
|
"<command2>" : "<log for command2>",
|
|
"return_codes/<command1>" : "<integer return code>"
|
|
}
|
|
}
|
|
|
|
**Dispatcher Response: "Finished" state**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "dispatcher",
|
|
"id" : "none",
|
|
"args" : {
|
|
"state" : "finished",
|
|
"time_finished" : "<ISO 8601 time date string>",
|
|
"cmd_list" : ["<command 1>", "<command 2>"],
|
|
"return_codes/<command 1>" : "<code 1>",
|
|
"return_codes/<command 2>" : "<code 2>",
|
|
"process_id" : "<random>"
|
|
}
|
|
}
|
|
|
|
Individual classes such as iohyve will move these dispatcher elements
|
|
into a "process_details" section. Tailored sample responses will be
|
|
provided in these classes' individual documentation pages. Here is a
|
|
generalized sample:
|
|
|
|
**Dispatcher Class Event Message**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "dispatcher",
|
|
"id" : "none",
|
|
"args" : {
|
|
"event_system" : "<namespace>/<name>",
|
|
"state" : "<pending/running/finished>",
|
|
"<field>" : "<Other fields depending on class>",
|
|
"process_details" : "<pending, running, or finished message as above>"
|
|
}
|
|
}
|
|
|
|
For specific details on these special types of events please refer to
|
|
the Classes section of this User Guide.
|
|
|
|
Life Preserver
|
|
--------------
|
|
|
|
To subscribe to the Life Preserver subsystem for event updates, use the
|
|
following:
|
|
|
|
**Websocket Request**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "subscribe",
|
|
"id" : "sampleID",
|
|
"args" : ["life-preserver"]
|
|
}
|
|
|
|
**Websocket Event Message**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "life_preserver",
|
|
"id" : "none",
|
|
"args" : {
|
|
"message" : "<text string>",
|
|
"priority" : "<number/warning level>",
|
|
"class" : "snapshot/replication"
|
|
}
|
|
}
|
|
|
|
System State
|
|
------------
|
|
|
|
To subscribe to the System State subsystem for event updates, use the
|
|
following:
|
|
|
|
**Websocket Request**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "subscribe",
|
|
"id" : "sampleID",
|
|
"args" : ["system-state"]
|
|
}
|
|
|
|
**Websocket Event Message**
|
|
|
|
This message will appear if the host name has changed and a priority
|
|
error has occurred.
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"namespace" : "events",
|
|
"name" : "system_state",
|
|
"id" : "none",
|
|
"args" : {
|
|
"hostname" : "<name>",
|
|
"hostnamechanged" : "true",
|
|
"zpools" : {
|
|
"<poolname>" : {
|
|
"size" : "<107G>",
|
|
"alloc" : "<13.1G>",
|
|
"free" : "<93.9G>",
|
|
"frag" : "<6%>",
|
|
"expandsz" : "<->",
|
|
"dedup" : "<1.00x>",
|
|
"altroot" : "<->",
|
|
"capacity" : "<12%>",
|
|
"health" : "<online>",
|
|
"priority" : "<priority>"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Bridge
|
|
------
|
|
|
|
Bridge events are automatically received by any system connected to a
|
|
bridge, with no subscription required. This event will get sent out any
|
|
time a new connection/disconnection is made from the bridge which
|
|
impacts the current connection. A client will only get the event when a
|
|
server connects/disconnects or vice versa.
|
|
|
|
**Websocket Reply: Connected Bridge**
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"id" : "",
|
|
"namespace" : "events",
|
|
"name" : "bridge",
|
|
"args" : {
|
|
"available_connections" : ["ID1", "ID2", "<etc..>"]
|
|
}
|
|
}
|
|
|
|
.. tip:: Available_connections are **all** the connections available at
|
|
the time, **not** a difference from a previous state. There may
|
|
be both new ID's in the list and ID's which are no longer
|
|
listed. |