blaxel-ai/dev-environment

Start the Local Dev Environment

The sandbox-api runs inside Docker with Air for hot-reload. Changes to Go files in sandbox-api/ are picked up automatically without restarting the container.

Prerequisites

Install dev dependencies (one-time):

make dependencies

This installs:

• air — hot-reload for Go
• swag — OpenAPI doc generation
• yq — YAML processor (via brew)

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Start the Dev Server

Important: Before starting, kill any existing process on port 8080:

lsof -ti :8080 | xargs kill -9 2>/dev/null || true

docker-compose up dev

This starts the dev service defined in docker-compose.yaml, which:

• Builds from docker/alpine.Dockerfile
• Mounts ./sandbox-api and ./tmp as volumes
• Sets SANDBOX_DEV_MODE=true
• Exposes port 8080 (sandbox-api) and 3010
• Runs air for hot-reload

Wait for this log line before testing:

Starting Sandbox API server on :8080

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Verify It's Running

curl http://localhost:8080/health

Or test the filesystem endpoint:

curl http://localhost:8080/filesystem/~

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Alternative: Run Without Docker (Faster Iteration)

If you want to skip Docker and run air directly on the host:

lsof -ti :8080 | xargs kill -9 2>/dev/null || true
make api

This runs air with SANDBOX_LOG_DIR=./tmp/log from the sandbox-api/ directory. Requires Go installed locally.

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Slim Dev Image (No Source Mount)

For testing the production-like image without hot-reload:

docker-compose up dev-slim

This builds from docker/slim.Dockerfile — no volume mounts, no hot-reload.

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Run Unit Tests

make test

Runs go test -v ./... from within sandbox-api/. These are fast in-process tests.

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Build the Docker Image

make docker-build

Builds blaxel/sandbox-api:latest. To run it:

make docker-run

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Logs

Dev logs are written to ./tmp/log/ on the host (mounted from the container). Tail them with:

tail -f tmp/log/*.log