octoturgeandClaude Sonnet 5.5
987a7b4708
SIGTERM already stops go2rtc (the signal handler), but SIGKILL and the OOM killer give the proxy no chance to, and the orphan keeps :1984/:8555 bound and a printer's access code in memory. Two layers, neither needing unsafe or a new dependency: - The watchdog records go2rtc's pid next to its config and, on startup, stops a leftover. It acts only if /proc confirms the pid is still *our* go2rtc - the configured binary on our own `-config` path - so a reused pid or another proxy's go2rtc is never touched; without /proc it does nothing. The pid file is removed when the supervisor goes away. - deploy/continuum-proxy.service, whose KillMode=control-group (written out, with the reason) makes systemd kill the whole cgroup when the proxy dies. Syntax-checked with systemd-analyze only; not run under a real systemd. Tests: the identity check, and a real stand-in process - a leftover is terminated while an unrelated `sleep` survives. Making the identity check always say yes fails both, so they do guard the behaviour. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
144 lines
8.0 KiB
Markdown
144 lines
8.0 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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## What's real right now
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- **Bambu MQTT** - a real client for both protocol generations (MQTT
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v3.1.1+BambuMQTT v1 on older firmware, MQTT v5+BambuMQTT v2 on current
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firmware), auto-detected per printer on connect (a firmware update can
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move the same physical printer between them, so this isn't something
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config can hard-code once and forget - see `printer/bambu.rs`'s
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`BambuProtocolPreference::Auto`). Request/reply correlation via
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`sequence_id`, an in-memory `print.push_status` cache that merges v1's
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partial updates and replaces on v2's full ones, and TLS trust that
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auto-pins a printer's certificate via trust-on-first-connect the first
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time the bundled CA doesn't verify (`printer/bambu.rs`'s
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`ensure_trusted`) - see `printer/bambu_mqtt.rs`'s doc comment for the
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full protocol write-up.
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- **Marlin/RepRap serial** - a real held-open serial connection that paces
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gcode lines by Marlin's own "ok" acknowledgment (`printer/marlin_serial.rs`).
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- **Wire shapes from schemas, not hand duplication** - Bambu's raw MQTT
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JSON is built straight from `continuum-schemas`' JSON Schema files via
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`continuum-schema-instance`, instead of a second hand-written copy of
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every request shape drifting out of sync with the schema.
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- **Cloud uplink** - a WebSocket client to `continuum-backend` that
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connects, sends a heartbeat on a timer, and reconnects on drop
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(`src/uplink/`).
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- **Camera restreaming** - generates go2rtc's configuration from the camera
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URLs the printers report, and restarts go2rtc when it changes
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(`src/camera.rs` + `src/go2rtc.rs`). Only the X1/H2 class publishes an
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RTSP URL: confirmed against two real machines, an H2C reports
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`rtsps://<ip>:322/streaming/live/1` and a P1P reports a camera with no URL
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for it. A P1/A1 camera needs Bambu's proprietary port-6000 JPEG stream,
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which this crate does not speak, so those printers advertise no stream
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rather than one that will not play. Note the stream is reachable on the
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gateway's LAN only - there is no relay.
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- **Bambu file upload** - implicit FTPS (port 990) into the printer's own
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`cache/` directory (`src/printer/bambu_ftps.rs`, via
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`BambuPrinter::upload_file`). **Confirmed live against a P1P on
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2026-10-03**: login, binary mode, and the transfer all work, byte count
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matched exactly.
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- **Print status** - `print.push_status` parsed into `PrintReport` with real
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job progress, temperatures, fans and HMS entries. Confirmed live on both
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generations (idle P1P on v1, H2C 20% into a job on v2); regression
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fixtures from those captures are in `tests/fixtures/`.
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## Examples worth knowing
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- `cargo run --example live_reports [printer-id]` - **read-only**, safe
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against a printer that is mid-print. Connects, reports firmware, and
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watches the status stream. Redirect stderr to capture raw payloads.
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- `cargo run --example bambu_idle_checks -- <printer-id>` - **writes**
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(FTPS upload, fan speed). Requires an explicit printer id and refuses to
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run unless that printer reports `gcode_state: "IDLE"`.
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## What routes between the cloud and the printers
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The uplink and the printer fleet are wired together, in both directions
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(`uplink/mod.rs`):
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- **Up:** every 5s, one `PrinterTelemetry` snapshot per printer that has
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reported, batched into a single `Telemetry` message. Verified live against
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a P1P and an H2C.
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- **Down:** a `Command` from the cloud is looked up by our own printer id,
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executed, and answered with a `CommandResult`. The set of commands is
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deliberately small - a fan speed and a single gcode line - and deliberately
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has no "start a print" variant; see `PrinterCommand`.
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One quirk worth knowing: a Bambu on protocol v1 only sends a *complete*
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status when asked, so each telemetry tick also fires a `pushing.pushall` for
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the next one. A v1 printer's telemetry is therefore one tick behind, which
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is why it shows up on the second frame rather than the first.
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## What's still a stub
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`start_uploaded_file` - the MQTT command that actually *starts* a print from
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an uploaded file - is written but has deliberately never been fired, since
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that commits a machine to hours of work. Its doc comment lists the three
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details to confirm on the first real attempt. `upload_file` is proven, but
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only with a small text file, not a multi-megabyte sliced `.3mf`.
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PrusaLink (REST) and Klipper/Moonraker (WebSocket) - `printer/prusa.rs`
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and `printer/klipper.rs` just `println!` what they'd send. Also not built
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yet: local buffering for telemetry across connectivity gaps (so telemetry
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produced while the uplink is down is simply lost), LAN printer discovery
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(SSDP/mDNS), and the mechanical plate-changer interface.
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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: connects every configured printer, then runs the cloud uplink + go2rtc watchdog
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cp printers.example.toml printers.toml # fill in your real printers (gitignored)
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cargo run --example auto_connect_bambu # checks/auto-pins each Bambu printer's certificate, no MQTT needed
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cargo run --example test_bambu_certs # narrower: just the raw TLS handshake, no auto-pinning
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cargo run --example printer_polymorphism # standalone trait+enum demo, fake data, no network/env needed
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cargo run --example bambu_commands_demo # round-trips hand-written structs against real captured Bambu JSON
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```
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## Structure
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```
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src/
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main.rs Loads+connects the printer fleet, then runs the uplink, camera config, watchdog and completion watcher 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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camera.rs Writes go2rtc's config from the camera URLs the printers report
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go2rtc.rs Restarts the go2rtc camera-restreaming process if it dies, or when the config changes
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and stops one a hard-killed proxy left behind (pid file next to its config)
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deploy/ systemd unit template; its KillMode=control-group is what stops go2rtc outliving a SIGKILL'd proxy
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printer/
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mod.rs GenericPrinter trait + PrinterBase + PrinterHandle enum - the trait+enum
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"inheritance" pattern this project uses instead of class inheritance
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bambu.rs The real Bambu printer type: cert trust, protocol version auto-detect, commands
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bambu_mqtt.rs The real MQTT wiring underneath bambu.rs - see its doc comment for the protocol details
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bambu_commands/ Hand-written serde structs mirroring continuum-schemas' bambulab/ shapes
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marlin_serial.rs A real held-open Marlin/RepRap serial connection
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prusa.rs, klipper.rs Still stubs - see "What's still a stub" above
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examples/
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auto_connect_bambu.rs Checks/auto-pins every Bambu printer's certificate (no MQTT)
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test_bambu_certs.rs Narrower: just a raw TLS handshake per Bambu printer
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printer_polymorphism.rs Standalone trait+enum demo, five fake printers, no network needed
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bambu_commands_demo.rs Round-trips bambu_commands' structs against real captured Bambu JSON
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```
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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/API key/serial port
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depending on vendor, and - for Bambu - an optional per-printer CA
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certificate override (see `certs/README.md`; most printers don't need one,
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since `connect()` auto-pins automatically).
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## Learning Rust through this repo
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`src/printer/mod.rs`'s doc comment is where the "how do I do inheritance
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without classes" question lives - trait (shared behavior) + struct
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(shared fields) + enum (the closed set of concrete types), instead of
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`GenericPrinter -> BambuPrinter/PrusaLinkPrinter/...` class inheritance.
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Run `printer_polymorphism` to see it work end to end without needing any
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real printer on the network.
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