Check token in separate thread

[alexmojaki]

Closes #247

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[adriangb]

Generally looks good to me. Seems like we never join the thread right? Do have a lock on configure()? What happens if I do;

configure()
while True:
  info()

?

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View logs

[alexmojaki]

from logfire import configure, info

configure(token='...')
info('hi')

14:01:46.559 hi
/Users/alex/work/logfire/logfire/_internal/config.py:849: UserWarning: Invalid Logfire token.
  warnings.warn('Invalid Logfire token.')
Failed to export batch code: 401, reason: {"detail":"Invalid token"}
/Users/alex/work/logfire/logfire/_internal/exporters/file.py:58: WritingFallbackWarning: Failed to export spans, writing to fallback file: /Users/alex/Library/Application Support/JetBrains/PyCharm2024.1/scratches/.logfire/logfire_spans.bin
  warnings.warn(
Failed to export batch code: 401, reason: {"detail":"Invalid token"}

[adriangb]

I mean what if it's a valid token. Does that info() call (1) warn if configure() hasn't actually finished, (2) wait for configure() to finish or (3) kick off another call to configure()?

[alexmojaki]

The code inside check_token does nothing critical, it just prints the dashboard URL if the token is valid or warns (previously errored) if not. We already have the token and can start using it immediately to export without checking it.