66 lines
2.9 KiB
Markdown
66 lines
2.9 KiB
Markdown
# continuum-proxy
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Edge gateway daemon for the Continuum print farm platform. Runs on a Linux
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SBC on-site, talks to printers over the LAN, and keeps a connection to the
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cloud control plane (`continuum-backend`).
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## This is a learning-stage boilerplate
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This repo is deliberately minimal right now - real printer protocol clients
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(Bambu MQTT+FTPS, PrusaLink REST, Klipper/Moonraker WebSocket) are **not**
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implemented yet. Each vendor is a stub that just prints what it would do
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(`src/printer/bambu.rs`, `prusa.rs`, `klipper.rs`). The idea is to learn
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Rust's polymorphism pattern (trait + enum, since Rust has no class
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inheritance) on something simple before adding real networking on top.
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## Getting started
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```bash
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cp .env.example .env
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cargo run # the daemon: cloud uplink + go2rtc watchdog
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cargo run --example printer_polymorphism # standalone demo, no network/env needed
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cp printers.example.toml printers.toml # fill in your real printers (gitignored)
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cargo run --example test_bambu_certs # real TLS handshake test against each Bambu printer
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```
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## Structure
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```
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src/
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main.rs Runs the uplink and the go2rtc watchdog side by side
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config.rs Loads settings from environment variables
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fleet.rs Loads printers.toml into ready-to-use PrinterHandles
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uplink/ WebSocket client to continuum-backend: connect, heartbeat, reconnect on drop
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printer/ GenericPrinter trait + PrinterBase + PrinterHandle enum + one stub per vendor
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go2rtc.rs Restarts the go2rtc camera-restreaming process if it dies
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examples/
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printer_polymorphism.rs Runs all five printer stubs through one `connect()` call site
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test_bambu_certs.rs Loads printers.toml, does a real TLS handshake to each Bambu printer
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```
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`src/printer/` is where the "inheritance" question lives - see that
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module's doc comment for the trait+enum pattern this project uses instead
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of class inheritance, and run `printer_polymorphism` to see it work.
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`printers.toml` (gitignored - copy from `printers.example.toml`) holds real
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per-printer connection details: host, access code, and - since not every
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Bambu printer trusts the same certificate (see `certs/README.md`) - an
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optional per-printer CA override. `src/fleet.rs` loads it; nothing in
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`main.rs` uses it yet, but `test_bambu_certs` does, as a real (if narrow -
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just the TLS handshake, no MQTT) way to check a printer's certificate
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without needing the full MQTT client built yet.
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## What's not here yet (on purpose)
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- Real MQTT/FTPS/HTTP/WebSocket printer clients - `src/printer/*.rs` has a
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`println!` where each of these will go.
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- Local SQLite buffering for telemetry across connectivity gaps.
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- LAN printer discovery (SSDP/mDNS).
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- The mechanical plate-changer interface (serial/GPIO).
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Add these back in one at a time as you get comfortable with the Rust
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underneath them - each is its own small lesson (async I/O, a new crate's
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API, error handling for a real protocol) rather than something to absorb
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all at once.
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