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import logging
import sys
from typing import Any
from rich._loop import loop_first
from rich.console import Console, ConsoleOptions, RenderableType, RenderResult
from rich.segment import Segment
from rich.text import Text
from rich_toolkit import RichToolkit
from rich_toolkit.element import Element
from rich_toolkit.styles import BaseStyle
from uvicorn.logging import DefaultFormatter
logger = logging.getLogger(__name__)
def should_use_rich_logs() -> bool:
"""Return True when stdout is a TTY and rich logs should be used, False otherwise."""
return sys.stdout.isatty()
class IndentedBlock:
"""Indent a renderable, hanging a prefix (e.g. an emoji bullet) on the
first line and aligning wrapped/extra lines under the text."""
def __init__(
self,
renderable: RenderableType,
*,
first_prefix: Text,
prefix: Text,
) -> None:
self.renderable = renderable
self.first_prefix = first_prefix
self.prefix = prefix
# Text renders its `end` ("\n" by default), which would break lines
self.first_prefix.end = ""
self.prefix.end = ""
def __rich_console__(
self, console: Console, options: ConsoleOptions
) -> RenderResult:
prefix_width = max(self.first_prefix.cell_len, self.prefix.cell_len)
lines = console.render_lines(
self.renderable,
options.update_width(options.max_width - prefix_width),
pad=False,
)
new_line = Segment.line()
for first, line in loop_first(lines):
if any(segment.text.strip() for segment in line):
yield from console.render(
self.first_prefix if first else self.prefix, options
)
yield from line
yield new_line
class FastAPIStyle(BaseStyle):
"""Uniform left indent with emoji bullets hanging to the left of the text.
``emoji=`` renders as a bullet in a fixed column; ``bullet=False`` drops
the bullet column and just indents. This is a small, purpose-built subset
of the richer style in fastapi-cloud-cli.
"""
content_padding = 1
emoji_column_width = 3
def render_element(
self,
element: Any,
is_active: bool = False,
done: bool = False,
parent: Element | None = None,
**kwargs: Any,
) -> RenderableType:
rendered = super().render_element(
element=element, is_active=is_active, done=done, parent=parent, **kwargs
)
emoji = kwargs.get("emoji", "")
if not emoji and not kwargs.get("bullet", True):
indent = Text(" " * (self.content_padding + 1))
return IndentedBlock(rendered, first_prefix=indent, prefix=indent)
return IndentedBlock(
rendered,
first_prefix=self._get_bullet_prefix(emoji),
prefix=Text(" " * (self.content_padding + self.emoji_column_width)),
)
def _get_bullet_prefix(self, emoji: str) -> Text:
prefix = Text(" " * self.content_padding)
if emoji:
prefix.append_text(Text.from_markup(emoji))
prefix.pad_right(
self.content_padding + self.emoji_column_width - prefix.cell_len
)
return prefix
LOG_LEVEL_COLORS = {
"debug": "blue",
"info": "cyan",
"warning": "yellow",
"warn": "yellow",
"error": "red",
"critical": "magenta",
"fatal": "magenta",
}
def _get_log_bullet(level: str) -> str:
"""Colored bar rendered in the emoji bullet column, matching the log
level, like the ``fastapi cloud logs`` output."""
color = LOG_LEVEL_COLORS.get(level.lower(), "dim")
return f"[{color}]鈻昜/{color}]"
class CustomFormatter(DefaultFormatter):
def __init__(self, *args: Any, **kwargs: Any) -> None:
super().__init__(*args, **kwargs)
self.toolkit = get_rich_toolkit()
def formatMessage(self, record: logging.LogRecord) -> str:
message = record.getMessage()
result = self.toolkit.print_as_string(
message, emoji=_get_log_bullet(record.levelname)
)
# Prepend newline to fix alignment after ^C is printed by the terminal
if message == "Shutting down":
result = "\n" + result
return result
def get_uvicorn_log_config() -> dict[str, Any]:
return {
"version": 1,
"disable_existing_loggers": False,
"formatters": {
"default": {
"()": CustomFormatter,
"fmt": "%(levelprefix)s %(message)s",
"use_colors": None,
},
"access": {
"()": CustomFormatter,
"fmt": "%(levelprefix)s %(client_addr)s - '%(request_line)s' %(status_code)s",
},
},
"handlers": {
"default": {
"formatter": "default",
"class": "logging.StreamHandler",
"stream": "ext://sys.stderr",
},
"access": {
"formatter": "access",
"class": "logging.StreamHandler",
"stream": "ext://sys.stdout",
},
},
"loggers": {
"uvicorn": {
"handlers": ["default"],
"level": "INFO",
"propagate": False,
},
"uvicorn.error": {"level": "INFO"},
"uvicorn.access": {
"handlers": ["access"],
"level": "INFO",
"propagate": False,
},
},
}
def get_rich_toolkit() -> RichToolkit:
return RichToolkit(style=FastAPIStyle())