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Martino Ferrari
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# Work Plan — uopi
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## Phases Overview
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| Phase | Name | Focus | Milestone |
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| ----- | --------------------- | ---------------------------------------------------------- | ----------------------------------------- |
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| 0 | Scaffold | Repo structure, build toolchain, CI | Empty binary serves embedded index page |
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| 1 | Core Backend | Broker, WebSocket protocol, REST skeleton | Live signal fan-out working end-to-end |
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| 2 | EPICS Data Source | CA connect, monitor, metadata, write | Real EPICS PVs visible in browser console |
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| 3 | Synthetic Data Source | DSP engine, Lua sandbox, signal composition | Synthetic signals computed and streamed |
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| 4 | Frontend Foundation | Svelte skeleton, WS client, signal stores, view mode shell | Subscribed values rendered in browser |
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| 5 | View Mode Widgets | All widget types rendered in view mode | Full interactive HMI panel |
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| 6 | Edit Mode | Konva canvas, drag-and-drop, resize, properties pane | Can build and save a panel |
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| 7 | Edit Mode — Advanced | Multi-select, align/distribute, undo/redo | Complete editor UX |
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| 8 | Historical Data | Archive integration, time navigation UI | Replay past data in widgets |
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| 9 | Signal Discovery | Signal tree, CSV import, EPICS Channel Finder | Usable without manual PV entry |
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| 10 | Hardening | Docs, packaging, integration tests, performance | Production-ready binary |
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---
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## Phase 0 — Scaffold
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**Goal:** working build pipeline, empty binary that serves a placeholder page.
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- [ ] Initialise Go module (`go mod init github.com/org/uopi`)
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- [ ] Create directory layout: `cmd/uopi/`, `internal/`, `web/`
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- [ ] Svelte + Vite + TypeScript project in `web/`
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- [ ] `//go:embed web/dist` in backend; `Makefile` builds frontend then backend
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- [ ] HTTP server on configurable port; serves embedded frontend
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- [ ] TOML config loading (`BurntSushi/toml` or `pelletier/go-toml`)
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- [ ] GitHub Actions CI: `make test` on push
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- [ ] `README.md` with quick-start instructions
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**Done when:** `./dist/uopi` starts and serves an "under construction" page.
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---
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## Phase 1 — Core Backend
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**Goal:** signal broker and WebSocket protocol working with a stub data source.
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- [ ] Define `DataSource` interface (`internal/datasource/iface.go`)
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- [ ] Implement in-memory stub data source (sine wave emitter) for development
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- [ ] Implement `Broker` (`internal/broker/`):
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- Subscribe / unsubscribe with reference counting
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- Fan-out goroutine per signal
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- Clean teardown when last subscriber leaves
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- [ ] WebSocket handler (`internal/server/ws.go`):
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- `subscribe` / `unsubscribe` / `write` / `history` messages
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- Pushes `update` and `meta` messages to client
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- Graceful close on disconnect
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- [ ] REST API skeleton (`internal/api/`): datasources, signals, interfaces endpoints (stub responses)
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- [ ] Unit tests: broker fan-out, subscribe/unsubscribe lifecycle
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**Done when:** a `wscat` client can subscribe to the stub source and receive timed updates.
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---
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## Phase 2 — EPICS Data Source
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**Goal:** real EPICS PVs readable and writable through the broker.
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- [ ] CGo wrapper for EPICS `libca` (`internal/datasource/epics/`):
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- Context init and cleanup
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- `ca_create_channel` with connection callback
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- `ca_add_event` monitor with value callback
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- `ca_put` for writes
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- DBR_CTRL get for metadata (units, limits, enum strings)
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- [ ] Map CA DBR types to internal `DataType` enum
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- [ ] Implement `DataSource` interface for EPICS
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- [ ] Config: `ca_addr_list`, reconnect interval
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- [ ] Handle disconnected/reconnected channels gracefully (quality = Bad/Uncertain)
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- [ ] Integration test with SoftIOC (gated on `EPICS_BASE` env var)
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**Done when:** a PV subscription round-trips from IOC → broker → WebSocket client with correct timestamp and units.
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---
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## Phase 3 — Synthetic Data Source
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**Goal:** users can define computed signals from existing signals.
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- [ ] Define synthetic signal definition schema (JSON)
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- [ ] Implement DAG evaluator: nodes re-evaluated on upstream change
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- [ ] Built-in node types (`internal/dsp/`):
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- Arithmetic: gain, offset, add, subtract, multiply, divide
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- Statistics: moving average (by count, by time), RMS
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- Filters: IIR lowpass/highpass/bandpass (via gonum or biquad)
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- Calculus: finite-difference derivative, cumulative integral
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- FFT / inverse FFT (gonum/dft)
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- Threshold / clamp
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- Custom expression (simple formula parser)
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- [ ] Lua node: sandboxed `gopher-lua` state per signal; inputs as globals
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- [ ] Load synthetic definitions from `synthetic.json` at startup
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- [ ] REST endpoint to CRUD synthetic signal definitions (persists to JSON file)
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- [ ] Unit tests for each DSP node type
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**Done when:** a synthetic moving-average of an EPICS PV is visible in the WebSocket stream.
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---
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## Phase 4 — Frontend Foundation
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**Goal:** Svelte app connects to WebSocket and reactively displays values.
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- [ ] Svelte project structure: routes for view (`/`) and edit (`/edit`)
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- [ ] WebSocket client (`ws.ts`): connect, reconnect, message dispatch
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- [ ] Signal store factory (`stores.ts`): `getStore(signalName)` returns reactive store
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- [ ] Subscription manager: reference counting mirrors broker's
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- [ ] View mode shell: collapsible interface list pane + empty canvas area
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- [ ] Fetch and list interfaces from REST API
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- [ ] Load interface XML; parse widget definitions
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- [ ] Render a minimal text-view widget reactively from signal store
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- [ ] Basic responsive layout; DPI adaptation for canvas
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**Done when:** loading a manually crafted XML interface displays live PV values.
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---
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## Phase 5 — View Mode Widgets
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**Goal:** all widget types rendered and interactive in view mode.
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- [ ] Text view widget
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- [ ] Gauge widget (SVG arc, configurable range/thresholds)
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- [ ] Vertical / horizontal bar widget
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- [ ] LED widget (condition evaluator, configurable colours)
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- [ ] Multi-LED widget (bitset, per-bit labels)
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- [ ] Set-value widget (input + Set button; sends `write` over WS)
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- [ ] Button widget (sends fixed value on click)
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- [ ] Plot widget:
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- Time-series (uPlot, streaming buffer of N points)
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- FFT, waterfall, histogram, bar chart, logic analyser (ECharts)
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- Multi-signal support; legend
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- [ ] Text label (static)
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- [ ] Image widget (base64 or server URL)
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- [ ] Link widget (navigates to another interface)
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- [ ] Right-click context menu: signal info dialog, copy name, export CSV
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- [ ] Svelte component tests for each widget type (mock store)
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**Done when:** a complete HMI panel with multiple widget types runs smoothly at 60 fps.
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---
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## Phase 6 — Edit Mode (Core)
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**Goal:** users can build and save an interface from scratch.
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- [ ] Konva stage setup in edit mode; `devicePixelRatio` scaling
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- [ ] Widget renderer adapter: same widget components rendered on Konva layer
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- [ ] Signal tree pane: fetch signal list, tree display, filter/search
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- [ ] Drag signal from tree → drop on canvas → widget type picker
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- [ ] Place widget at drop coordinates with default size
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- [ ] Single selection: bounding box + resize handles via Konva `Transformer`
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- [ ] Move widget by dragging body
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- [ ] Delete widget (× button or Del key)
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- [ ] Properties pane: common options (label, position, size)
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- [ ] Per-widget property editors (range, colour, plot type, etc.)
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- [ ] Save interface to server (POST/PUT XML)
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- [ ] Load interface from server (GET XML, populate canvas)
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- [ ] Export / import local XML file
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**Done when:** an engineer can create a panel with 5+ widgets, save it, reload it, and see live data.
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---
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## Phase 7 — Edit Mode (Advanced)
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**Goal:** complete editing UX matching the functional spec.
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- [ ] Multi-select: Ctrl+click toggle; rubber-band area select
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- [ ] Group move: drag any selected widget to move all
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- [ ] Group delete: Del key on selection
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- [ ] Align toolbar: left / center-H / right / top / center-V / bottom
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- [ ] Distribute toolbar: evenly by center / by gap (H and V)
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- [ ] Undo / redo: command pattern, Ctrl+Z / Ctrl+Shift+Z
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- [ ] Snap-to-grid (optional, toggle in toolbar)
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- [ ] Add text label tool
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- [ ] Add image tool (upload to server or embed base64)
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- [ ] Add link tool
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- [ ] Collapsible signal tree pane and properties pane (toggle buttons)
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- [ ] Right-click on interface in list: Edit / Clone / Delete
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**Done when:** the editor feels complete and the undo stack works reliably.
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---
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## Phase 8 — Historical Data
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**Goal:** users can navigate to past timestamps using archive data.
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- [ ] EPICS Archive Appliance HTTP API client (`internal/datasource/epics/archive.go`)
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- [ ] Broker `History()` dispatch: route to correct data source's `History()` impl
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- [ ] WebSocket `history` request / response handling
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- [ ] Frontend: time range picker in view mode toolbar
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- [ ] "Live" button: flushes history state, re-subscribes to live updates
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- [ ] Plot widget: switch between streaming and historical range mode
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- [ ] Point-value widgets: show value at selected timestamp
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**Done when:** a plot can display 24 hours of archived data with a time slider.
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---
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## Phase 9 — Signal Discovery
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**Goal:** users can find signals without knowing their names in advance.
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- [ ] EPICS: attempt Channel Finder or `cainfo` enumeration; fall back to manual entry
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- [ ] Signal tree: lazy-load children on expand
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- [ ] Manual add custom PV (EPICS): text input in signal tree
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- [ ] New synthetic signal wizard: name, inputs, node graph UI
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- [ ] CSV import: parse `NAME, DataSource, DS_PARAMETERS`; add to tree
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**Done when:** a new user can find and subscribe to a PV without prior knowledge.
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---
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## Phase 10 — Hardening
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**Goal:** production-quality binary, docs, performance validation.
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- [ ] End-to-end integration tests (real SoftIOC, headless browser via Playwright)
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- [ ] Benchmark: 20 clients × 100 signals; verify < 5 ms fan-out latency
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- [ ] Benchmark: frontend at 10 Hz update rate; verify 60 fps
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- [ ] Static binary validation: run on RHEL 7 (Docker image `centos:7`)
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- [ ] Security: Lua sandbox audit; XML XXE protection; write-permission guard
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- [ ] Graceful shutdown: drain WS connections, flush pending writes
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- [ ] Structured logging (`log/slog`)
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- [ ] `/metrics` endpoint (Prometheus format) for server monitoring
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- [ ] Complete `README.md` and operator docs
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- [ ] Release: `goreleaser` config for Linux amd64 + arm64 binaries
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**Done when:** binary passes integration tests on CentOS 7 container with a SoftIOC.
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---
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## Estimated Effort
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These are rough single-developer estimates. Parallel work across backend and frontend where possible will reduce calendar time.
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| Phase | Effort |
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| --------- | ---------------- |
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| 0 | 1–2 days |
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| 1 | 3–5 days |
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| 2 | 1–2 weeks |
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| 3 | 1–2 weeks |
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| 4 | 3–5 days |
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| 5 | 2–3 weeks |
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| 6 | 2–3 weeks |
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| 7 | 1–2 weeks |
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| 8 | 1 week |
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| 9 | 1 week |
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| 10 | 1–2 weeks |
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| **Total** | **~14–20 weeks** |
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