Merge update

[NotYuSheng]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @NotYuSheng, 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 primarily focuses on enhancing the deployment architecture by introducing an Nginx reverse proxy. This change centralizes external access to the various microservices, improves routing, and removes direct port exposures, leading to a more robust and manageable setup. Additionally, it includes minor code cleanups and a dependency version adjustment.

Highlights

• Nginx Integration: Introduced an Nginx reverse proxy to centralize access and routing for the microservices, including new Dockerfile, configuration template, and environment examples.
• Service Configuration & Exposure: Updated chat_service, pdf_extraction_service, and pdf_processor_service FastAPI applications to use root_path for proper routing behind the Nginx proxy. Correspondingly, direct host port mappings for these services were removed from docker-compose.yml.
• Dependency Management: Downgraded the chromadb image version from 1.0.14 to 1.0.13 in docker-compose.yml.
• Code Clean-up & Refinement: Removed commented-out code and simplified error messages in the embedder_service files for improved readability and less verbose error details.

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[gemini-code-assist]

Code Review

This pull request introduces an Nginx reverse proxy to act as a single entry point for the various microservices, which is a great architectural improvement. The services are correctly configured to work behind the proxy. The changes also include some good security hardening by preventing detailed exception messages from being exposed to clients.

I've found a critical issue in the Nginx Dockerfile that will prevent the image from building, and a high-priority concern regarding a dependency downgrade that needs clarification. Please see the detailed comments.

For future pull requests, it would be very helpful to provide a more descriptive title and a summary of changes in the description. This helps reviewers understand the context and intent of the changes more quickly.

The review was conducted following the OmniPDF Python Style Guide, which primarily references PEP 8. The changes were also checked against the custom rules for comment priority and naming conventions. No style violations were found in the submitted code changes.

[gemini-code-assist]

The Docker image nginx:1.29.0-alpine does not exist on Docker Hub, which will cause the docker-compose build command to fail. The latest mainline version of Nginx is 1.27.0 and the latest stable version is 1.26.1.

Please use a valid and existing image tag to ensure the build is successful.

FROM nginx:1.27.0-alpine

[gemini-code-assist]

The chromadb/chroma image is being downgraded from 1.0.14 to 1.0.13. While this might be intentional to work around an issue in the newer version, downgrading dependencies can reintroduce previously fixed bugs or security vulnerabilities.

Could you please provide some context for this change? If this downgrade is necessary, it would be good to add a comment in the docker-compose.yml file explaining the reason.