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| import http.server | |
| import time | |
| # (1) Make sure prometheus_client is installed | |
| from prometheus_client import start_http_server, Gauge | |
| REQUEST_INPROGRESS = Gauge('app_request_inprogress', 'application request in progress') | |
| APP_PORT = 8000 # (2) define application port | |
| METRICS_PORT = 8001 # (3) define metrics port | |
| class HandleRequests(http.server.BaseHTTPRequestHandler): | |
| @REQUEST_INPROGRESS.track_inprogress() # (4) one way to instrument with Gauge | |
| def do_GET(self): | |
| # (5.1) the second way to instrument with Gauge. Call inc() first | |
| # REQUEST_INPROGRESS.inc() | |
| # (6) make the request takes longer so that you will see the difference when you do the query | |
| time.sleep(5) | |
| self.send_response(200) | |
| self.send_header("Content-type", "text/html") | |
| self.end_headers() | |
| self.wfile.write(bytes("<html><head><title>A Taste of Prometheus</title></head><body><h2>welcome</h2></body></html>", "utf-8")) | |
| self.wfile.flush() | |
| # (5.2) the second way to instrument with Gauge. Call dec() when the request complete | |
| # REQUEST_INPROGRESS.dec() | |
| if __name__ == "__main__": | |
| # (7) start the server for exposing metrics | |
| start_http_server(METRICS_PORT) | |
| # (8) start the web application server | |
| server = http.server.HTTPServer(('localhost', APP_PORT), HandleRequests) | |
| server.serve_forever() |
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