modulith 0.1.7

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Modulith

Build once. Run everywhere. Scale effortlessly.

Modulith lets you focus on your application logic, not deployment infrastructure. Structure your code as modules once, then run them locally and remotely, and scale across instances without touching your code.

🚀 What You Get

• 🧱 Scalable by design — move from local → distributed seamlessly
• 🔗 Composable — build systems by combining modules, local or remote
• 🌐 Shareable — publish and reuse modules across projects
• 🔐 Built-in access control — rate limits, burst limits, auth tokens

📦 Install

pip install modulith

🚀 Quick Start

Define a module and call it locally:

# calculator/module.py
from modulith import Modulith

module = Modulith("calculator")

@module.capability("add")
def add(a: float, b: float) -> float:
    return a + b

result = module("add", kwargs={"a": 1, "b": 2}) # → 3

Or run it from the CLI:

modulith run calculator.module add --kwargs '{"a": 1, "b": 2}' # → 3

🐳 Build and Publish

Package your module as a Docker image and push it to Docker Hub:

modulith build calculator.module
modulith push <docker-image>
# or
modulith build calculator.module --push

Once published, you can serve or deploy your module on any machine, no local source code needed.

🌐 Serve Your Module

Expose your module over the network with access controls:

# From source
modulith serve \
--source calculator.module \ 
--public \                  # Accessible by anyone
--rate-limit 100 \          # 100 requests/minute
--burst-limit 20            # Allow short bursts

# From Docker Hub
modulith serve \
--image <docker-image> \ 
--public \                  
--rate-limit 100 \          
--burst-limit 20            

You'll see:

🔑 Your authentication token: ...

🌐 Module 'calculator' is live:
- Repository: user3bef3/calculator
- Public URL: https://6ebm5g.instatunnel.my
- Local URL: http://localhost:8000

⚙️ Capabilities:
- add(a: float, b: float) → float

⚡ Public access limits:
- Rate limit: 100 requests/minute
- Burst limit: 20 requests

🛑 Press Ctrl+C to stop

Run your module from any machine:

calculator = Modulith.remote(
    "user3bef3/calculator",
    access_token="..."
)
result = calculator("add", kwargs={"a": 1, "b": 2}) # → 3 (executed remotely)

Same interface. Local or remote, no difference.

⚖️ Deploy at Scale

Scale horizontally across multiple instances (e.g. AWS Fargate):

# From source
modulith deploy \
--source calculator.module \
--instances 5 \           
--cpus 2 \                
--memory 1GB \            
--public \                     
--rate-limit 100 \             
--burst-limit 20 \             
--auth-token <your-auth-token> 

# From Docker Hub
modulith deploy \
--image <docker-image> \
--instances 5 \           
--cpus 2 \                
--memory 1GB \            
--public \                     
--rate-limit 100 \             
--burst-limit 20 \             
--auth-token <your-auth-token> 

Tip: Use the same --auth-token across all instances to group them into the same pool. Different tokens = separate pools.

🔗 Compose Modules

Build new modules by calling existing modules, local or remote:

new_module = Modulith()
calculator = Modulith.remote("user3bef3/calculator", access_token="...")

@new_module.capability("double_sum")
def double_sum(a: float, b: float) -> float:
    sum1 = calculator("add", kwargs={"a": a, "b": b})
    sum2 = calculator("add", kwargs={"a": a, "b": b})  # cache hit
    return sum1 + sum2

result = new_module("double_sum", kwargs={"a": 1, "b": 2}) #  → 6

Execution flow:

double_sum(1, 2)
  → add(1, 2)   [remote]  → 3
  → add(1, 2)   [cache]   → 3
  → 3 + 3                 → 6

👤 Account (Optional)

Skip manual token management by linking modules to your account:

modulith signup # Create an account
modulith login

Once logged in, your module is automatically registered under your username:

🌐 Module 'calculator' is live:
- Repository: <your_username>/calculator
...

CLI Reference

Command	Description
modulith signup	Create a new account and get an authentication token
modulith login	Log in to your account and store the authentication token securely
modulith run	Run a capability locally
modulith build	Package module as a Docker image
modulith push	Push image to Docker Hub
modulith serve	Serve module on current machine
modulith deploy	Deploy module on remote machine