Motia Workers

Worker modules for the III engine.

Modules

image-resize

A Rust-based image resize worker that connects to the III engine via WebSocket and processes images through stream channels.

Supported formats: JPEG, PNG, WebP (including cross-format conversion)

Resize strategies:

Strategy	Behavior
scale-to-fit	Scales the image to fit within the target dimensions, preserving aspect ratio (default)
crop-to-fit	Scales and center-crops to fill the exact target dimensions

Features:

• EXIF orientation auto-correction
• Configurable quality per format (JPEG, WebP)
• Per-request parameter overrides (dimensions, quality, strategy, output format)
• Module manifest output (--manifest)

Prerequisites

• Rust 1.70+
• A running III engine instance

Build

cd image-resize
cargo build --release

Usage

# Run with defaults (connects to ws://127.0.0.1:49134)
./target/release/image-resize

# Custom config and engine URL
./target/release/image-resize --config ./config.yaml --url ws://host:port

# Print module manifest
./target/release/image-resize --manifest

Configuration

Create a config.yaml file:

width: 200        # default target width
height: 200       # default target height
strategy: scale-to-fit  # or crop-to-fit
quality:
  jpeg: 85
  webp: 80

All fields are optional and fall back to the defaults shown above.

Tests

cd image-resize
cargo test