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from __future__ import annotations
from importlib import import_module
import dask.config
from distributed.http.utils import RequestHandler
class PrometheusCollector:
def __init__(self, server):
self.server = server
self.namespace = dask.config.get("distributed.dashboard.prometheus.namespace")
self.subsystem = None
def build_name(self, name):
full_name = []
if self.namespace:
full_name.append(self.namespace)
if self.subsystem:
full_name.append(self.subsystem)
full_name.append(name)
return "_".join(full_name)
class PrometheusNotAvailableHandler(RequestHandler):
def get(self):
self.write(
"# Prometheus metrics are not available, see: "
"https://docs.dask.org/en/stable/how-to/setup-prometheus.html#setup-prometheus-monitoring"
)
self.set_header("Content-Type", "text/plain; version=0.0.4")
def import_metrics_handler(module_name: str, handler_name: str) -> type[RequestHandler]:
"""Import ``handler_name`` from ``module_name`` if ``prometheus_client``
is installed, import the ``PrometheusNotAvailableHandler`` otherwise."""
try:
import prometheus_client # noqa: F401
except ModuleNotFoundError:
return PrometheusNotAvailableHandler
module = import_module(module_name)
handler = getattr(module, handler_name)
assert issubclass(handler, RequestHandler)
return handler
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