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from __future__ import annotations
from dataclasses import dataclass, field
from typing import TYPE_CHECKING, Callable, Mapping, Sequence
from litestar.contrib.prometheus.middleware import (
PrometheusMiddleware,
)
from litestar.exceptions import MissingDependencyException
from litestar.middleware.base import DefineMiddleware
__all__ = ("PrometheusConfig",)
try:
import prometheus_client # noqa: F401
except ImportError as e:
raise MissingDependencyException("prometheus_client", "prometheus-client", "prometheus") from e
if TYPE_CHECKING:
from litestar.connection.request import Request
from litestar.types import Method, Scopes
@dataclass
class PrometheusConfig:
"""Configuration class for the PrometheusConfig middleware."""
app_name: str = field(default="litestar")
"""The name of the application to use in the metrics."""
prefix: str = "litestar"
"""The prefix to use for the metrics."""
labels: Mapping[str, str | Callable] | None = field(default=None)
"""A mapping of labels to add to the metrics. The values can be either a string or a callable that returns a string."""
exemplars: Callable[[Request], dict] | None = field(default=None)
"""A callable that returns a list of exemplars to add to the metrics. Only supported in opementrics-text exposition format."""
buckets: list[str | float] | None = field(default=None)
"""A list of buckets to use for the histogram."""
excluded_http_methods: Method | Sequence[Method] | None = field(default=None)
"""A list of http methods to exclude from the metrics."""
exclude_unhandled_paths: bool = field(default=False)
"""Whether to ignore requests for unhandled paths from the metrics."""
exclude: str | list[str] | None = field(default=None)
"""A pattern or list of patterns for routes to exclude from the metrics."""
exclude_opt_key: str | None = field(default=None)
"""A key or list of keys in ``opt`` with which a route handler can "opt-out" of the middleware."""
scopes: Scopes | None = field(default=None)
"""ASGI scopes processed by the middleware, if None both ``http`` and ``websocket`` will be processed."""
middleware_class: type[PrometheusMiddleware] = field(default=PrometheusMiddleware)
"""The middleware class to use.
"""
@property
def middleware(self) -> DefineMiddleware:
"""Create an instance of :class:`DefineMiddleware <litestar.middleware.base.DefineMiddleware>` that wraps with.
[PrometheusMiddleware][litestar.contrib.prometheus.PrometheusMiddleware]. or a subclass
of this middleware.
Returns:
An instance of ``DefineMiddleware``.
"""
return DefineMiddleware(self.middleware_class, config=self)
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