rss2go — RSS-to-Email Daemon

rss2go is a lightweight, modern RSS feed aggregator and notifier. It periodically scrapes RSS/Atom feeds and emails new items to subscribed addresses.

Features

• Modular Architecture: Decoupled crawler, mailer, and feed watcher pools.
• Pure Go Persistence: Uses SQLite (modernc.org/sqlite) for storage—no CGO required.
• Dynamic Sync: Automatically detects added or removed feeds without restarting the daemon.
• Structured Logging: Powered by Go's log/slog.
• Robust Configuration: Load settings from YAML, JSON, TOML, or Environment Variables via spf13/viper.
• Observability: Prometheus-style /metrics endpoint.
• Graceful Shutdown: Context-aware design ensures all workers finish clean on SIGINT/SIGTERM.

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🚀 Installation

Ensure you have Go 1.24+ installed.

git clone https://github.com/hobeone/rss2go.git
cd rss2go
go build -o rss2go ./cmd/rss2go

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⚙️ Configuration

rss2go looks for a configuration file named rss2go.yaml in the current directory by default. You can override this with the --config flag.

Example rss2go.yaml

# Database location
db_path: "rss2go.db"

# Log level: debug, info, warn, error
log_level: "info"

# Polling settings
poll_interval: "1h"
poll_jitter: "5m"

# Crawler settings
crawler_pool_size: 5
crawler_timeout: "30s"

# Mailer settings (SMTP)
smtp_server: "smtp.gmail.com"
smtp_port: 587
smtp_user: "your-email@gmail.com"
smtp_pass: "your-app-password"
smtp_sender: "rss2go@example.com"

# Mailer settings (Alternative: Local Sendmail)
# sendmail: "/usr/sbin/sendmail"

# Metrics server
metrics_addr: ":8080"

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🛠️ Usage

rss2go uses a hierarchical command structure.

1. Initialize & Start Daemon

./rss2go daemon

2. Manage Feeds

# Add a feed
./rss2go feed add "https://go.dev/blog/feed.atom" "Go Blog"

# List feeds (find IDs)
./rss2go feed list

# Delete a feed
./rss2go feed del 1  # or URL: ./rss2go feed del https://...

# Catch up unread items without mailing
./rss2go feed catchup 1

3. Manage Users & Subscriptions

# Add a user
./rss2go user add "subscriber@example.com"

# Subscribe a user to a feed
./rss2go user subscribe "subscriber@example.com" 1

# Unsubscribe a user
./rss2go user unsubscribe "subscriber@example.com" 1

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📈 Monitoring

If metrics_addr is configured, you can view the internal state:

curl http://localhost:8080/metrics

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🐳 Docker Deployment

rss2go and its companion web scraper can be run together using Docker Compose.

1. Build and Start

docker-compose up -d --build

2. Usage with Scraper

The scraper service runs on http://scraper:8282. To subscribe to a site that doesn't have a native feed add code to the scraper command to support it.

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🧪 Testing

Run the full test suite to ensure everything is working correctly:

go test -race ./...