Relia

The "ESLint" for Cloud Costs. Prevent cloud waste before it ships to production.

Features • How It Works • Quick Start • Read the Docs

---

⚡ Problem: The "Bill Shock" Loop

Every engineering team knows the ritual:

1. Engineer deploys a change (e.g., upsizing an RDS instance).
2. CI/CD passes (tests pass, build succeeds).
3. 30 days later: Finance asks why the AWS bill jumped by $5,000.

Existing tools (CloudHealth, Vantage) are reactive. Unlike traditional cloud cost management tools (like CloudHealth or Vantage) that report on past spending, Relia is a proactive guardrail. It parses your Infrastructure-as-Code (IaC), calculates the monthly cost impact using the AWS Price List API, and enforces budget policies in your Git workflow.

---

✅ Prerequisites

Requirement	Version	Note
Python	3.10+	Required
Terraform	v0.14+	Core source code
OS	Linux, macOS, Win	Cross-platform support

---

🛡️ Solution: Shift Left

Relia sits in your Pull Request. It parses your Terraform changes, estimates the monthly cost impact, and blocks the merge if you blow your budget.

Tagline: "Stop paying the infrastructure tax. Start shipping."

---

🧩 How It Works

Relia runs as a CLI tool in your local environment or CI pipeline to minimize the feedback loop.

flowchart LR
    A[Engineer] -->|`git push`| B(Pull Request)
    B --> C{Relia CI Check}

    subgraph "Relia Engine"
    D[Parser] -->|1. Read .tf files| E[Estimator]
    E -->|2. Fetch Prices| F[AWS Pricing API]
    F -->|3. Calculate Delta| G[Budget Policy]
    end

    C -->|Run| D

    G -->|Over Budget ❌| H[Block Merge]
    G -->|Under Budget ✅| I[Allow Merge]

    style H fill:#ffcccb,stroke:#ff0000
    style I fill:#ccffcc,stroke:#00ff00

Loading

---

✨ Features

1. Pre-Deploy Cost Estimation

Know exactly what a PR will cost before you click merge. Supports EC2, RDS, Lambda, NAT Gateways, and more.

• Active Advisor: Proactively suggests cost optimizations.
  • EBS Volumes: Suggests upgrading gp2 to gp3 (up to 20% cheaper).
  • EC2 Instances: Recommends modern generations (e.g., t2 -> t3) and Graviton options.
  • Load Balancers: Identifies potential savings in LCU vs Hourly usage.
• Prevent Bill Shock: Catch expensive resources in PRs before they are merged.

Shareable HTML Reports

Generate a premium, self-contained HTML dashboard for your team or finance department. This report includes:

• Infrastructure Topology Graph (Mermaid.js)
• Interactive Cost Table (Sort & Filter)
• Optimization Tips

# Generate report.html
relia estimate . --format html --out report.html

👉 See Full List of Supported Resources

Supports both standard .tf files and terraform plan -json output:

# Standard Estimate
$ relia estimate
📊 Relia Cost Estimate ...

# View as JSON for pipeline parsing
relia estimate . --format json | jq .total_cost

📊 Relia Cost Estimate ...

# With Visual Topology
$ relia estimate --topology
🌳 Infrastructure Topology
☁️  Project
└── aws_instance
    └── 💻 web  $60.00/mo

# With Cost Diff
$ relia estimate --diff
📉 Cost Diff
+ aws_instance.web  +$60.00/mo

2. Budget Guardrails

Set clear policies in .relia.yaml and enforce them with relia check.

# .relia.yaml
budget: 500.0
rules:
  aws_instance: 50.0 # Max price per instance

$ relia check --budget 500
✅ Within budget. Total: $450.00, Limit: $500.00

3. CI/CD Integration

Relia ships with a GitHub Action to block expensive PRs automatically.

---

🚀 Quick Start

1. Installation

Relia is available via PyPI (and Poetry):

pip install relia
# or
poetry add relia

Generate a shareable HTML dashboard

relia estimate . --format html --out cost-report.html

2. Run Locally

Navigate to your Terraform project and run:

1. Initialize Config (Optional):

   relia init
   # Creates .relia.yaml (budget/rules) & .relia.usage.yaml (usage overlay)

2. Estimate Cost:

   relia estimate .

3. Check Budget:

   relia check . --budget 1000
   
   # Or using config rules:
   relia check .
   
   # Simulate check (exit 0 even if failure):
   relia check . --dry-run

3. Run with Docker

You can also run Relia without installing Python:

docker run --rm -v $(pwd):/app relia-io/relia estimate .

Advanced Usage

Handling Complex Variables & Modules

For complex projects using variables, locals, or modules, Relia supports Terraform Plan JSON output.

1. Generate the plan JSON:

   terraform plan -out=tfplan
   terraform show -json tfplan > plan.json

2. Estimate costs using the JSON plan:

   relia estimate plan.json

Usage Assumptions (S3, Lambda, etc.)

Some resources (like S3 or Lambda) depend on usage metrics not present in Terraform. You can define these in .relia.usage.yaml:

Example .relia.usage.yaml:

usage:
  aws_s3_bucket.my_bucket:
    storage_gb: 500
    monthly_requests: 10000

Relia will automatically load this file and apply the usage data (e.g., 500GB of storage) when calculating costs.

4. Use as Pre-Commit Hook

Prevent bad commits locally by adding Relia to your .pre-commit-config.yaml:

repos:
  - repo: https://github.com/davidahmann/relia_oss
    rev: v1.1.1
    hooks:
      - id: relia-estimate # Prints cost table on every commit
      - id: relia-check    # Blocks commit if budget exceeded

Maintenance

Updating the Bundled Pricing Database

Relia ships with a lightweight, bundled pricing database (SQLite) for offline usage. To update this database with new mocked values or seed data:

1. Ensure you have AWS credentials configured.
2. Run the script to fetch fresh prices from AWS (US/EU regions):

   python scripts/seed_pricing.py

3. Commit the updated relia/core/bundled_pricing.db.

5. Add to CI/CD

Add Relia to your GitHub Actions workflow to block expensive PRs.

# .github/workflows/cost-check.yml
name: Cost Check
on: [pull_request]
jobs:
  relia:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: relia-io/action@v1
        with:
          path: './infra'
          budget: '1000'
          markdown_report: 'relia_report.md'

---

🗺️ Roadmap

• Phase 1 (MVP): CLI, Terraform Support, AWS Pricing.
• Phase 2: GitHub Action, Budget Policies via .relia.yml.
• Phase 3 (v0.3.0): Lambda/NAT/LB Support, Usage Overlays.
• Phase 4: Utilization Scanning ("Fix" Mode).

---

🤝 Contributing

We love contributions! Please check out CONTRIBUTING.md to get started.

📄 License

This project is licensed under the Apache 2.0 License.