Prometheus (#11)

* Begin adding prometheus metric support

* Deeply navigate all metrics for prometheus

* Readme blurb

README.md

@@ -437,6 +437,14 @@ The following types are supported:
 
 SshSysMon uses handlebars to template its summary output.  See the [templating](/templates) for more information.
 
+#### Prometheus
+
+SshSysMon supports writing to a format supported by prometheus, which can in-turn be pushed to a pushgateway via a pipe.
+
+```sh
+sshmon -f prometheus myconfig.yml | curl --data-binary @- http://prometheus.example.com/metrics/job/sshmon
+```
+
 ### Writing Your Own Component
 
 To learn how to write a specific type of component, visit its readme in the appropriate subfolder.

sshsysmon/templates/__init__.py

@@ -29,12 +29,39 @@ def __coalesce(this, *args):
 def __alphanum(this, val, replaceWith='_'):
 	return sanitize(val, replaceWith)
 
+def __numeric(this, val):
+	if hasattr(val, '__float__'):
+		return float(val)
+	if hasattr(val, '__int__'):
+		return int(val)
+	return 1 if val else 0
+
+def __deepEach(this, options, obj):
+	results = []
+	def deepWalk(obj, address):
+		if isinstance(obj, list):
+			for i in range(len(obj)):
+				deepWalk(obj[i], '{}[{}]'.format(address, i))
+		elif isinstance(obj, dict):
+			for k, v in obj.items():
+				deepWalk(v, k if not address else '{}.{}'.format(address, k))
+		else:
+			kwargs = {
+				'key': address,
+			}
+			scope = pybars.Scope(obj, this, options['root'], **kwargs)
+			results.extend(options['fn'](scope))
+	deepWalk(obj, '')
+	return results
+
 __helpers = {
 	'ifEq' : __ifEq,
 	'replace' : __replace,
 	'coalesce' : __coalesce,
 	'alphanum': __alphanum,
-	'format': __format
+	'format': __format,
+	'numeric': __numeric,
+	'deepEach': __deepEach,
 }
 
 def __template(src, data):

sshsysmon/templates/prometheus.hb

@@ -0,0 +1,10 @@
+# TYPE sshmon_alert gauge
+{{#servers}}{{#inspectors}}{{#alarms}}
+sshmon_alert{server="{{alphanum ../../name}}",inspector="{{alphanum ../type}}",alarm="{{alphanum name}}"} {{#if fired}}1{{else}}0{{/if}}
+{{! new line intentional }}
+{{/alarms}}{{/inspectors}}{{/servers}}
+# TYPE sshmon_metric gauge
+{{#servers}}{{#inspectors}}{{#deepEach metrics}}
+sshmon_metric{server="{{alphanum ../../name}}",inspector="{{alphanum ../type}}",name="{{alphanum @key}}"} {{numeric this}}
+{{! intentionally blank}}
+{{/deepEach}}{{/inspectors}}{{/servers}}