feat: install plugin dep support pypi index url

[fatelei]

Description

fix #580

add env

PIP_INDEX_URL=
PIP_EXTRA_INDEX_URL=
UV_INDEX_URL=
UV_EXTRA_INDEX_URL=

allow use index url to install plugin dep

fix race condition

errMsg and lastActiveAt in different coroutine, there is a race condition.

Type of Change

• Bug fix
• New feature
• Refactor
• Performance improvement
• Other

Essential Checklist

Testing

• I have tested the changes locally and confirmed they work as expected
• I have added unit tests where necessary and they pass successfully

Bug Fix (if applicable)

• I have used GitHub syntax to close the related issue (e.g., Fixes #123 or Closes #123)

Additional Information

Please provide any additional context that would help reviewers understand the changes.

[gemini-code-assist]

Summary of Changes

Hello @fatelei, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the flexibility and robustness of Python plugin dependency management. It introduces comprehensive support for configuring custom PyPI index URLs, allowing users to leverage private repositories or mirrors for faster and more controlled dependency resolution. Additionally, it addresses a critical race condition in the installation process and improves logging practices, making the system more stable, secure, and observable.

Highlights

• PyPI Index Configuration: Introduced new environment variables (PIP_INDEX_URL, PIP_EXTRA_INDEX_URL, UV_INDEX_URL, UV_EXTRA_INDEX_URL) to allow users to specify custom PyPI index URLs for plugin dependency installation.
• Precedence Logic for Indexes: Implemented specific precedence rules for applying these index URLs, differentiating between uv sync (for pyproject.toml) and uv pip install (for requirements.txt) to ensure correct mirror usage.
• Race Condition Fix: Resolved a race condition during dependency installation by using sync.Mutex for error message accumulation and atomic.Int64 for tracking lastActiveAt timestamps, ensuring thread-safe updates.
• Enhanced Logging & Security: Added detailed logging for the dependency installation process, including start/end times, and introduced a sanitizeArgs function to redact credentials from URLs in logs, improving security and observability.
• Improved Output Handling: Refactored stdout/stderr reading during dependency installation to use bufio.Scanner for more reliable line-by-line processing, preventing potential buffer overflows and improving log clarity.

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[gemini-code-assist]

Code Review

This pull request introduces valuable support for configuring PyPI index URLs, which will help speed up plugin dependency installations. The implementation is well-documented in the README. Additionally, the fix for the race condition during dependency installation is a critical improvement for the stability of the daemon. The enhanced logging, including sanitizing arguments to prevent credential leakage, is also a great addition.

I have two suggestions for improvement:

1. Refactoring duplicated code in preparePipArgs and prepareSyncArgs to improve maintainability.
2. Strengthening the argument sanitization logic to more robustly prevent credential leakage in logs.