azure-functions-doctor 0.3.0

A diagnostic tool for Python Azure Functions

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Azure Functions Doctor for Python

A fast and extensible diagnostic CLI for Python-based Azure Functions projects.

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Why Azure Functions Doctor?

• Getting random 500 errors and suspect misconfiguration?
• Need to verify your dev environment before CI/CD deployment?
• Want a quick health check without digging through docs?

Azure Functions Doctor helps save time by automating common environment diagnostics.

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Key Features

• Diagnose Python version, venv, azure-functions package
• Validate host.json, local.settings.json, function structure
• Fully customizable via rules.json
• Output: colorized CLI or machine-readable JSON
• Built-in rule engine, easily extensible

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Architecture

Azure Functions Doctor uses a modular, rule-based architecture for extensibility and maintainability:

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   CLI Interface │    │  Core Diagnostic │    │   Rule System   │
│    (cli.py)     │───▶│    Engine        │───▶│  (rules.json)   │
│                 │    │   (doctor.py)    │    │                 │
└─────────────────┘    └──────────────────┘    └─────────────────┘
         │                        │                       │
         │                        ▼                       ▼
         │               ┌──────────────────┐    ┌─────────────────┐
         │               │     Handler      │    │  Target/Version │
         │               │    Dispatcher    │    │    Resolver     │
         │               │  (handlers.py)   │    │ (target_resolver │
         │               └──────────────────┘    │      .py)       │
         │                        │              └─────────────────┘
         │                        ▼
         │               ┌──────────────────┐
         │               │   Individual     │
         │               │    Handlers      │
         │               │ • file_exists    │
         │               │ • compare_version│
         │               │ • check_package  │
         │               │ • validate_json  │
         │               └──────────────────┘
         │                        │
         ▼                        ▼
┌─────────────────┐    ┌──────────────────┐
│ Output Formatter│    │     Results      │
│   JSON / CLI    │◀───│   Aggregator     │
│                 │    │                  │
└─────────────────┘    └──────────────────┘

Key Components

• CLI Interface: Entry point handling commands, flags, and output formatting
• Diagnostic Engine: Core orchestration logic loading rules and coordinating execution
• Rule System: Declarative JSON-based rule definitions for extensibility
• Handler Dispatcher: Routes rule types to appropriate handler functions
• Individual Handlers: Specific diagnostic implementations (file checks, version validation, etc.)
• Results Aggregator: Collects and structures all diagnostic outcomes
• Output Formatter: Renders results as colorized CLI output or machine-readable JSON

This design allows easy extension by adding new rules to rules.json and implementing corresponding handlers, without modifying core engine logic.

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Requirements

• Python 3.9+
• Git
• (Optional) Azure Functions Core Tools v4+ (npm i -g azure-functions-core-tools@4)
• (Recommended) Unix-like shell or PowerShell for Makefile support

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Installation

From PyPI:

pip install azure-functions-doctor

Or from source:

git clone https://github.com/yeongseon/azure-functions-doctor-for-python.git
cd azure-functions-doctor-for-python
python3 -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate
pip install -e .

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Usage

Run the Doctor

func-doctor diagnose

Show Help

func-doctor --help

Sample: examples/basic-hello/diagnose-output.md

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Example

See examples/basic-hello for:

• Minimal Azure Functions structure setup
• Running the CLI and inspecting results

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Documentation

• Getting Started: docs/index.md
• Custom Rules: docs/rules.md
• Developer Guide: docs/development.md

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Contributing

We welcome issues and PRs!

Please see CONTRIBUTING.md for contribution guidelines.

If you find this useful, please star the repo!

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License

This project is licensed under the MIT License.