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from typing import Callable |
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from urllib.parse import parse_qs |
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from .exposition import _bake_output |
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from .registry import CollectorRegistry, REGISTRY |
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def make_asgi_app(registry: CollectorRegistry = REGISTRY, disable_compression: bool = False) -> Callable: |
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"""Create a ASGI app which serves the metrics from a registry.""" |
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async def prometheus_app(scope, receive, send): |
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assert scope.get("type") == "http" |
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params = parse_qs(scope.get('query_string', b'')) |
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accept_header = ",".join([ |
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value.decode("utf8") for (name, value) in scope.get('headers') |
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if name.decode("utf8").lower() == 'accept' |
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]) |
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accept_encoding_header = ",".join([ |
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value.decode("utf8") for (name, value) in scope.get('headers') |
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if name.decode("utf8").lower() == 'accept-encoding' |
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]) |
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status, headers, output = _bake_output(registry, accept_header, accept_encoding_header, params, disable_compression) |
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formatted_headers = [] |
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for header in headers: |
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formatted_headers.append(tuple(x.encode('utf8') for x in header)) |
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payload = await receive() |
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if payload.get("type") == "http.request": |
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await send( |
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{ |
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"type": "http.response.start", |
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"status": int(status.split(' ')[0]), |
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"headers": formatted_headers, |
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} |
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) |
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await send({"type": "http.response.body", "body": output}) |
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return prometheus_app |
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