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Support systemd-journal-gatewayd using a TCP socket #5576

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merged 1 commit into from
Jan 27, 2025

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@agners agners commented Jan 24, 2025

Proposed change

This allows to use regular TCP/IP sockets to connect to the systemd-journal-gatewayd.

The drive to add this support is to have advanced logs available in devcontainers as well. Since we don't have systemd in devcontainers, socket activation with UNIX domains sockets is not easily doable: The daemon systemd-journal-gatewayd does not support it natively, and work arounds using socat did not work reliably.

With this change devcontainers can simply tell Supervisor to use TCP/IP instead by setting SUPERVISOR_SYSTEMD_JOURNAL_GATEWAYD_URL to http://172.30.32.1:19531/.

Type of change

  • Dependency upgrade
  • Bugfix (non-breaking change which fixes an issue)
  • New feature (which adds functionality to the supervisor)
  • Breaking change (fix/feature causing existing functionality to break)
  • Code quality improvements to existing code or addition of tests

Additional information

  • This PR fixes or closes issue: fixes #
  • This PR is related to issue:
  • Link to documentation pull request:
  • Link to cli pull request:
  • Link to client library pull request:

Checklist

  • The code change is tested and works locally.
  • Local tests pass. Your PR cannot be merged unless tests pass
  • There is no commented out code in this PR.
  • I have followed the development checklist
  • The code has been formatted using Ruff (ruff format supervisor tests)
  • Tests have been added to verify that the new code works.

If API endpoints or add-on configuration are added/changed:

Summary by CodeRabbit

  • New Features

    • Enhanced systemd-journal-gatewayd service connection configuration
    • Added support for alternative connection methods via environment variable
  • Improvements

    • Increased flexibility in logging system connection settings
    • Improved handling of service availability detection

@agners agners force-pushed the support-systemd-journal-gatewayd-tcp-socket branch from e4fd79c to a3c0ab6 Compare January 24, 2025 13:19
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coderabbitai bot commented Jan 24, 2025

📝 Walkthrough

Walkthrough

The changes in the supervisor/host/logs.py file modify the LogsControl class to enhance the handling of the systemd-journal-gatewayd service's availability and connection logic. The updates introduce checks for the SUPERVISOR_SYSTEMD_JOURNAL_GATEWAYD_URL environment variable to determine service availability and connection method, allowing the logging system to connect via either a Unix socket or an HTTP endpoint based on the environment configuration.

Changes

File Change Summary
supervisor/host/logs.py - Updated available property to check for SUPERVISOR_SYSTEMD_JOURNAL_GATEWAYD_URL environment variable
- Modified journald_logs method to use environment variable for connection configuration
- Adjusted URL handling to support dynamic connection methods

Sequence Diagram

sequenceDiagram
    participant Logs as LogsControl
    participant Env as Environment
    participant Session as ClientSession
    participant Journal as systemd-journal-gatewayd

    Logs->>Env: Check SUPERVISOR_SYSTEMD_JOURNAL_GATEWAYD_URL
    alt URL is set
        Logs->>Logs: Set available = True
        Logs->>Session: Create session with HTTP connector
    else URL not set
        Logs->>Logs: Check socket availability
        Logs->>Session: Create session with Unix socket
    end
    Logs->>Journal: Request logs
    Journal-->>Logs: Return log data
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Actionable comments posted: 0

🧹 Nitpick comments (3)
supervisor/host/logs.py (3)

12-12: Remove the unused import
TCPConnector is never used. You can safely remove it to address the static analysis warning.

-from aiohttp import ClientError, ClientSession, ClientTimeout, TCPConnector
+from aiohttp import ClientError, ClientSession, ClientTimeout
🧰 Tools
🪛 Ruff (0.8.2)

12-12: aiohttp.TCPConnector imported but unused

Remove unused import: aiohttp.TCPConnector

(F401)


168-173: Consider validating the environment variable
Using the environment variable directly may lead to errors if misconfigured or injected. As a good practice, consider validating the URL format and handling exceptions gracefully.


178-178: Ensure consistent path usage
Using f"{path}" is straightforward. If you do not need string interpolation, consider passing path directly for cleaner readability.

-                    f"{path}",
+                    path,
📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 690f1c0 and e4fd79c.

📒 Files selected for processing (1)
  • supervisor/host/logs.py (3 hunks)
🧰 Additional context used
🪛 Ruff (0.8.2)
supervisor/host/logs.py

12-12: aiohttp.TCPConnector imported but unused

Remove unused import: aiohttp.TCPConnector

(F401)

⏰ Context from checks skipped due to timeout of 90000ms (4)
  • GitHub Check: Run tests Python 3.13.1
  • GitHub Check: Build armv7 supervisor
  • GitHub Check: Build armhf supervisor
  • GitHub Check: Build aarch64 supervisor
🔇 Additional comments (2)
supervisor/host/logs.py (2)

9-9: No issues with the new import
The import of os is valid as it is used to check environment variables.


57-59: Conditional check for environment variable is valid
Checking for SUPERVISOR_SYSTEMD_JOURNAL_GATEWAYD_URL to determine availability is consistent with the new feature for TCP support.

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Actionable comments posted: 3

🧹 Nitpick comments (1)
supervisor/host/logs.py (1)

57-57: Fix typo in docstring.

There's a typo in the docstring: "gatwayd" should be "gatewayd".

-        """Check if systemd-journal-gatwayd is available."""
+        """Check if systemd-journal-gatewayd is available."""
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Reviewing files that changed from the base of the PR and between e4fd79c and a3c0ab6.

📒 Files selected for processing (1)
  • supervisor/host/logs.py (3 hunks)
⏰ Context from checks skipped due to timeout of 90000ms (1)
  • GitHub Check: Run tests Python 3.13.1
🔇 Additional comments (2)
supervisor/host/logs.py (2)

9-9: LGTM!

The os module import is correctly placed with other standard library imports and is necessary for accessing environment variables.


168-181: Add tests for TCP connection functionality.

Please add unit tests to verify:

  1. URL validation in the available property
  2. TCP connection setup in journald_logs
  3. Error handling for invalid URLs and connection failures

Would you like me to help generate the test cases?

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None of the bot's suggestions make sense to me in the scope of this PR, so LGTM!

@agners agners merged commit 8ff9c08 into main Jan 27, 2025
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@agners agners deleted the support-systemd-journal-gatewayd-tcp-socket branch January 27, 2025 12:58
@github-actions github-actions bot locked and limited conversation to collaborators Jan 29, 2025
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2 participants