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