Nancy-Chauhan · May 2, 2021 16:27 · May 2, 2021
diff --git a/httpd_exporter.py b/httpd_exporter.py
@@ -0,0 +1,45 @@
+import os
+import re
+from time import sleep
+
+from prometheus_client import start_http_server, Counter
+
+
+def main():
+    start_http_server(8000)
+    gather_metrics()
+
+
+def gather_metrics():
+    print("collecting httpd metrics")
+    regex = r"\d+\.\d+\.\d+\.\d+ - \S+ \[.*\] \".*?\" (\d+) (\d+|-).*"
+    request_counter = Counter('httpd_requests', 'http request', ["status_code"])
+    bytes_sent = Counter('httpd_bytes_sent', 'Total bytes sent by httpd')
+    for line in follow_log("/var/log/apache2/access.log"):
+        match = re.match(regex, line)
+        if match:
+            print("updating values")
+            status_code = int(match.group(1))
+            request_counter.labels(status_code=status_code).inc()
+            if match.group(2) != "-":
+                size = int(match.group(2))
+                bytes_sent.inc(size)
+        else:
+            print("line did not match", line)
+
+
+def follow_log(file):
+    with open(file, 'r') as f:
+        f.seek(0, os.SEEK_END)
+        # infinite loop
+        while True:
+            line = f.readline()
+            if not line:
+                sleep(0.1)
+                continue
+
+            yield line
+
+
+if __name__ == '__main__':
+    main()