Enhance Modal Deployment Infrastructure with Improved Robustness

[codegen-sh]

User description

Overview

This PR enhances the Modal deployment infrastructure in the codegen-examples repository with improved robustness, better error handling, and updates to the latest Modal version (1.0.0).

Key Improvements

Main Deployer.sh Script

• Added colorized output for better readability
• Added Python version check to ensure compatibility
• Improved error handling and user feedback
• Added deployment verification
• Added post-deployment options to view logs and status
• Added sorting of examples for consistent display
• Added ability to extract app names from deploy.sh scripts

Documentation

• Created a comprehensive README.md for the examples directory
• Added detailed documentation about the Deployer.sh script
• Listed all deployable examples with descriptions

Individual deploy.sh Scripts

• Updated to use Modal 1.0.0
• Added colorized output for better readability
• Added environment variable validation
• Added deployment verification
• Added webhook URL extraction and display
• Improved error handling and user feedback

Template and Examples

• Created a deploy.sh.template file as a reference for new examples
• Updated slack_chatbot and linear_webhooks examples to use the latest Modal API
• Added persistent volume support for better data management
• Updated environment templates with all required variables

Testing

The deployment infrastructure has been tested with the following examples:

• slack_chatbot
• linear_webhooks

All examples deploy successfully and run as expected with the latest Modal version.

Next Steps

Future improvements could include:

• Adding automated tests for deployment scripts
• Implementing a CI/CD pipeline for automated deployment
• Adding more detailed logging and monitoring capabilities
• Creating a web dashboard for deployment status

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💻 View my work • About Codegen

Summary by Sourcery

Enhance and standardize the Modal-based deployment infrastructure across codegen-examples by updating to Modal 1.0.0, refactoring webhook handlers into ASGI FastAPI services, enriching deploy scripts with colorized output, version checks, environment validation, deployment verification, and post-deployment options, and by adding user-friendly documentation.

New Features:

• Introduce an interactive, menu-driven Deployer.sh supporting concurrent deployments and post-deploy options to view logs and status.
• Refactor Linear and Slack webhook handlers into ASGI FastAPI applications with signature verification, structured event models, and persistent logging via Modal volumes.

Enhancements:

• Upgrade all deploy scripts and example code to Modal 1.0.0 with Python and Modal version checks, colorized output, and environment variable validation.
• Add persistent volume support for FastAPI services and consolidate modal image builds for consistency.
• Extract and sort example list in Deployer.sh for a consistent user experience.

Documentation:

• Add a comprehensive README.md for the examples directory explaining prerequisites, usage, and available examples.
• Provide a deploy.sh.template reference for creating new example deploy scripts.

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PR Type

Enhancement, Documentation

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Description

• Major refactor of Modal deployment scripts for robustness and UX

  • Colorized output, version checks, error handling, and post-deploy options
  • Deployment verification and log/status viewing features
  • Environment variable validation and template improvements

• Upgrade Modal-based examples to Modal 1.0.0 and FastAPI ASGI services

  • Refactor linear_webhooks to FastAPI ASGI app with signature verification
  • Add persistent volume support for data storage
  • Update slack_chatbot deployment and API for new Modal version

• Add comprehensive documentation and deployment templates

  • New README.md for examples and deployment guide
  • Add deploy.sh.template for new Modal examples

• Improve user feedback and error messages across all scripts

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Changes walkthrough 📝

	Relevant files
Enhancement	6 files Deployer.sh Robust, interactive deployer with color, checks, and post-deploy options +141/-29 deploy.sh Improved deployment script with validation and feedback    +42/-10  deploy.sh Enhanced deployment script with env checks and feedback    +46/-11  webhooks.py Refactor to FastAPI ASGI app, add signature verification, Modal 1.0.0 +153/-98 api.py Update Modal app name, add persistent volume, deploy entrypoint +13/-2    .env.template Standardize env template formatting and variable names      +6/-5
Documentation	2 files README.md Add comprehensive documentation for examples and deployment +78/-0    deploy.sh.template Add template for new Modal deploy scripts with best practices +97/-0

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[sourcery-ai]

Reviewer's Guide

Refactors the deployment tool by extending the main Deployer.sh with ANSI colorization, version and environment validation, deployment verification and interactive post-deploy options; adds comprehensive documentation and templates; and updates individual example scripts and apps to Modal 1.0.0—including refactoring the Linear webhooks service into a FastAPI ASGI app with Pydantic models, HMAC signature checks, file-based logging, persistent volumes, and improved Slack chatbot support.

Sequence Diagram for Linear Webhook Processing in Modal

sequenceDiagram
    participant Linear as Linear Service
    participant ModalEndpoint as Modal Endpoint (/webhook)
    participant FastAPIApp as FastAPI App (linear-webhooks)
    participant Logger as log_event()
    participant EventHandler as Event Handler (issue/comment)
    participant Volume as Persistent Volume (linear-data)

    Linear->>ModalEndpoint: POST /webhook (event data, signature)
    ModalEndpoint->>FastAPIApp: Forward request
    activate FastAPIApp
    FastAPIApp->>FastAPIApp: Verify signature (HMAC SHA256)
    FastAPIApp->>FastAPIApp: Parse request to LinearEvent model
    FastAPIApp->>Logger: log_event(LinearEvent)
    activate Logger
    Logger->>Volume: Write event to JSONL file (/data/linear_events_...)
    deactivate Logger
    alt Event type is "Issue"
        FastAPIApp->>EventHandler: handle_issue_event(LinearEvent)
    else Event type is "Comment"
        FastAPIApp->>EventHandler: handle_comment_event(LinearEvent)
    else Other event type
        FastAPIApp->>FastAPIApp: Prepare "ignored" response
    end
    activate EventHandler
    EventHandler-->>FastAPIApp: Processed event response
    deactivate EventHandler
    FastAPIApp-->>ModalEndpoint: HTTP Response
    ModalEndpoint-->>Linear: HTTP Response
    deactivate FastAPIApp

Loading

File-Level Changes

Change	Details	Files
Enhanced main Deployer.sh with robust checks, colorized feedback, and interactive features	Added ANSI color codes for banners, prompts and status messages Implemented Python and Modal version detection with warnings Introduced example sorting for consistent menus Added deployment verification function Provided post-deployment options to view logs or deployment status Enabled automated app name extraction for log/status commands	codegen-examples/examples/Deployer.sh
Added documentation and a deploy script template	Created README.md outlining example categories and deployer usage Listed all deployable examples with descriptions Introduced deploy.sh.template as a reference for new examples	codegen-examples/examples/README.md codegen-examples/examples/deploy.sh.template
Updated individual deploy.sh scripts with standardized deployment flow	Pinned Modal to version 1.0.0 and checked CLI installation Added ANSI color output and environment variable validation Verified deployment success and displayed webhook URLs Enforced .env template creation and validation before deploy	codegen-examples/examples/slack_chatbot/deploy.sh codegen-examples/examples/linear_webhooks/deploy.sh
Refactored Linear webhooks handler into a FastAPI ASGI service	Replaced CodegenApp with FastAPI app decorated as Modal ASGI function Defined Pydantic model for incoming events Implemented HMAC signature verification Logged events to persistent volume in JSONL format Modularized issue and comment handlers with typed responses	codegen-examples/examples/linear_webhooks/webhooks.py
Enhanced Slack chatbot application with persistent storage and correct context formatting	Corrected code context block formatting in answer_question Renamed Modal app and added persistent volume for vector index Initialized deploy entrypoint in main for direct runs Updated FastAPI ASGI decorator and volume mounting	codegen-examples/examples/slack_chatbot/api.py

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Error Handling The exception handling in the webhook endpoint could be improved. The current implementation catches all exceptions generically, which might mask specific issues. Consider handling different exception types separately. except Exception as e: raise HTTPException(status_code=400, detail=f"Invalid event data: {str(e)}") Missing Backtick The code block in the context string is missing a closing backtick which could cause formatting issues when displaying code in responses. context += f"File: {file.filepath}\n```\n{file.content}```\n\n" App Name Extraction The app name extraction from deploy.sh scripts uses a simple grep pattern that might be fragile. It could fail to extract app names if the deploy.sh files have different formatting. app_name=$(grep -o "modal app [a-zA-Z0-9_-]*" "$SCRIPT_DIR/$example/deploy.sh" | head -1 | awk '{print $3}') if [ -z "$app_name" ]; then

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Fix request body consumption The webhook handler needs to read the request body twice - once for signature verification and once for JSON parsing. Since FastAPI's request.body() can only be read once, you should store the body content in a variable to reuse it for both operations. codegen-examples/examples/linear_webhooks/webhooks.py [63-77] # Verify signature if provided if x_linear_signature: signing_secret = os.environ.get("LINEAR_SIGNING_SECRET") if not signing_secret: raise HTTPException(status_code=500, detail="LINEAR_SIGNING_SECRET not configured") body = await request.body() signature = hmac.new( signing_secret.encode("utf-8"), body, hashlib.sha256, ).hexdigest() if not hmac.compare_digest(signature, x_linear_signature): raise HTTPException(status_code=401, detail="Invalid signature") + + # Parse event data + try: + data = json.loads(body) + event = LinearEvent(**data) + except Exception as e: + raise HTTPException(status_code=400, detail=f"Invalid event data: {str(e)}") +else: + # Parse event data + try: + data = await request.json() + event = LinearEvent(**data) + except Exception as e: + raise HTTPException(status_code=400, detail=f"Invalid event data: {str(e)}") Apply / Chat Suggestion importance[1-10]: 9 __ Why: The current code attempts to read the request body twice (once via await request.body() for signature verification and again via await request.json() for parsing) if x_linear_signature is present. This will cause an error during JSON parsing as the body stream would have already been consumed. The suggested change correctly reuses the body read for signature verification, fixing a critical functional bug.	High
General	Update Pydantic serialization The dict() method is deprecated in newer versions of Pydantic. Use model_dump() instead for Pydantic v2 compatibility, which is more future-proof and provides better serialization. codegen-examples/examples/linear_webhooks/webhooks.py [100-105] def log_event(event: LinearEvent): """Log Linear event to file.""" log_file = f"/data/linear_events_{datetime.now().strftime('%Y%m%d')}.jsonl" with open(log_file, "a") as f: - f.write(json.dumps(event.dict()) + "\n") + try: + # Try Pydantic v2 method first + event_dict = event.model_dump() + except AttributeError: + # Fall back to Pydantic v1 method + event_dict = event.dict() + f.write(json.dumps(event_dict) + "\n") print(f"Logged {event.type} {event.action} event") Apply / Chat Suggestion importance[1-10]: 6 __ Why: The suggestion correctly points out that event.dict() is deprecated in Pydantic V2. The improved_code offers a robust solution by trying event.model_dump() (for V2) and falling back to event.dict() (for V1), enhancing compatibility and maintainability.	Low
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[codegen-sh]

I've fixed the failing pre-commit checks in PR #141. The issue was related to formatting in some of the Modal deployment infrastructure files. I've committed and pushed the fixes to the same branch.

The changes include:

• Fixed formatting in .env.template files
• Adjusted line endings and whitespace in deployment scripts
• Made other minor formatting adjustments to comply with the pre-commit hooks

The PR should now pass the checks and be ready for review.

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