Move debug to store/collect health checker

[mirror/dsa-puppet.git] / modules / mirror_health / files / mirror-health

diff --git a/modules/mirror_health/files/mirror-health b/modules/mirror_health/files/mirror-health
new file mode 100755 (executable)
index 0000000..025382e
--- /dev/null
+++ b/modules/mirror_health/files/mirror-health
@@ -0,0 +1,80 @@
+#! /usr/bin/python3
+
+import os
+import requests
+import time
+import calendar
+import logging
+import subprocess
+from email.utils import parsedate
+logging.basicConfig(level=logging.INFO)
+
+if 'MIRROR_CHECK_HOSTS' in os.environ:
+    HOSTS = os.environ['MIRROR_CHECK_HOSTS'].split()
+else:
+    HOSTS = open(os.environ['MIRROR_CHECK_HOSTS_FILE']).read().split()
+
+OUTPUT_DIR = "/run/dsa-mirror-health-{}".format(os.environ['MIRROR_CHECK_SERVICE'])
+HEALTH_FILE = os.path.join(OUTPUT_DIR, "health")
+URL = os.environ['MIRROR_CHECK_URL']
+HEALTH_CHECK_URL = os.environ['MIRROR_CHECK_HEALTH_URL']
+INTERVAL = int(os.environ.get('MIRROR_CHECK_INTERVAL', '60'))
+
+def retrieve_from_host(host, url):
+    proxies = {
+        'http': 'http://{}:80'.format(host),
+        'https': 'http://{}:443'.format(host),
+    }
+    headers = {'User-Agent': 'mirror-health'}
+    return requests.get(url, headers=headers, timeout=5, proxies=proxies, allow_redirects=False)
+
+def last_modified(response):
+    lm = 0
+    if response.status_code == 200 and response.headers.get('last-modified'):
+        lm = calendar.timegm(parsedate(response.headers['last-modified']))
+    return lm
+
+def healthy(response):
+    if response.status_code == 200:
+        return True
+    return False
+
+def check_shutdown():
+    if subprocess.call(['dsa-is-shutdown-scheduled']) == 0:
+        logging.info("considering myself unhealthy, shutdown scheduled")
+        return False
+    return True
+
+def check_uptodate():
+    latest_ts = 0
+    for host in HOSTS:
+        try:
+            lm = last_modified(retrieve_from_host(host, URL))
+            logging.debug("lm for host %s: %s", host, lm)
+            if healthy(retrieve_from_host(host, HEALTH_CHECK_URL)):
+                latest_ts = max(latest_ts, lm)
+        except (requests.exceptions.ProxyError, requests.exceptions.ReadTimeout, requests.exceptions.ConnectTimeout, requests.exceptions.ConnectionError):
+            pass
+    try:
+        local_lm = last_modified(retrieve_from_host('localhost', URL))
+    except (requests.exceptions.ProxyError, requests.exceptions.ReadTimeout, requests.exceptions.ConnectTimeout, requests.exceptions.ConnectionError):
+        return False
+    logging.debug("lm for localhost: %s", local_lm)
+    if local_lm < latest_ts:
+        logging.info("considering myself unhealthy my ts=%s latest_ts=%s", local_lm, latest_ts)
+        return False
+    return True
+
+while True:
+    start = time.time()
+    if check_shutdown() and check_uptodate():
+        logging.info("considering myself healthy")
+        open(HEALTH_FILE, 'w').write("OK")
+    else:
+        try:
+            os.remove(HEALTH_FILE)
+        except OSError:
+            pass
+    sleep_time = start + INTERVAL - time.time()
+    logging.debug("sleeping for %d seconds", sleep_time)
+    time.sleep(sleep_time)