Hastic-exporter for Prometheus (#520)

tools/prometheus-hastic-exporter/prometheus-hastic-exporter.py

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+#!/usr/bin/env python3
+from prometheus_client import start_http_server, Metric, REGISTRY
+import json
+import requests
+import sys
+import time
+import dateutil.parser as dt
+
+class JsonCollector(object):
+
+  def __init__(self, endpoint):
+    self._endpoint = endpoint
+
+  def collect(self):
+
+    response = None
+    try:
+        resp = requests.get(self._endpoint).content.decode('UTF-8')
+        response = json.loads(resp)
+    except Exception as e:
+        print('got exception, skip polling loop {}'.format(e))
+        return
+    
+    commitHash = response.get('git', {}).get('commitHash')
+    packageVersion = response.get('packageVersion')
+    labels={'commitHash': commitHash, 'packageVersion': packageVersion}
+
+    metrics = {
+        'activeWebhooks': response.get('activeWebhooks'),
+        'ready': int(response.get('analytics', {}).get('ready', 0)),
+        'tasksQueueLength': response.get('analytics', {}).get('tasksQueueLength'),
+        'awaitedTasksNumber': response.get('awaitedTasksNumber'),
+        'detectionsCount': response.get('detectionsCount')
+    }
+
+    for name, value in metrics.items():
+        if value is not None:
+            metric = Metric(name, name, 'gauge')
+            metric.add_sample(name, value=value, labels=labels)
+            yield metric
+        else:
+            print('{} value is {}, skip metric'.format(name, value))
+
+    lastAlive = response.get('analytics', {}).get('lastAlive')
+    if lastAlive:
+        lastAlive = int(dt.parse(lastAlive).timestamp()) * 1000 #ms
+        metric = Metric('lastAlive', 'lastAlive', 'gauge')
+        metric.add_sample('lastAlive', value=lastAlive, labels=labels)
+        yield metric
+
+    timestamp = response.get('timestamp')
+    if timestamp:
+        timestamp = int(dt.parse(timestamp).timestamp()) * 1000 #ms
+        metric = Metric('timestamp', 'timestamp', 'gauge')
+        metric.add_sample('timestamp', value=timestamp, labels=labels)
+        yield metric
+
+
+if __name__ == '__main__':
+  hastic_url = sys.argv[1]
+  exporter_port = int(sys.argv[2])
+
+  start_http_server(exporter_port)
+  REGISTRY.register(JsonCollector(hastic_url))
+
+  while True: time.sleep(1)

tools/prometheus-hastic-exporter/prometheus-hastic-exporter.service

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+[Unit]
+Description=hastic-exporter
+
+[Service]
+RestartSec=1
+Restart=always
+ExecStart=/usr/bin/hastic-exporter.py http://0.0.0.0:8000 5777
+
+[Install]
+WantedBy=multi-user.target

tools/prometheus-hastic-exporter/requirements.txt

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+prometheus_client>=0.6.0
+requests>=2.7.0
+python-dateutil>=2.7.3