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1
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import time
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2
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3
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from prometheus_client import Counter, Gauge, Histogram
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from starlette.middleware.base import BaseHTTPMiddleware, RequestResponseEndpoint
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from starlette.requests import Request
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from starlette.responses import Response
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7
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REQUESTS = Counter("starlette_requests_total", "Total count of requests by method and path.", ["method", "path"])
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9
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RESPONSES = Counter(
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"scholexplorerPortal_responses_total",
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"Total count of responses by method, path and status codes.",
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["method", "path", "status_code"],
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)
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REQUESTS_PROCESSING_TIME = Histogram(
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"scholexplorerPortal_requests_processing_time_seconds",
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"Histogram of requests processing time by path (in seconds)",
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["method", "path"],
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)
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EXCEPTIONS = Counter(
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"scholexplorerPortal_exceptions_total",
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"Histogram of exceptions raised by path and exception type",
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["method", "path", "exception_type"],
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)
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REQUESTS_IN_PROGRESS = Gauge(
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"scholexplorerPortal_requests_in_progress",
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"Gauge of requests by method and path currently being processed",
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["method", "path"],
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)
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class PrometheusMiddleware(BaseHTTPMiddleware):
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async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -> Response:
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33
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method = request.method
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34
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path = request.url.path
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35
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REQUESTS_IN_PROGRESS.labels(method=method, path=path).inc()
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REQUESTS.labels(method=method, path=path).inc()
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try:
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before_time = time.time()
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response = await call_next(request)
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after_time = time.time()
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except Exception as e:
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EXCEPTIONS.labels(method=method, path=path, exception_type=type(e).__name__).inc()
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raise e from None
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else:
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REQUESTS_PROCESSING_TIME.labels(method=method, path=path).observe(after_time - before_time)
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RESPONSES.labels(method=method, path=path, status_code=response.status_code).inc()
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48
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finally:
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REQUESTS_IN_PROGRESS.labels(method=method, path=path).dec()
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50
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51
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return response
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