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Two looks were somebody else's language spoken well, and neither was the product's. A dashboard nobody has dressed yet should look like the rest of the app, so there is now a third set that follows the root DESIGN-GUIDELINES.md to the letter — `--card` surfaces told from the page by a hairline and a low shadow rather than by colour, every control a pill, 16px panels, frosted floating chrome, one slate-blue accent spent on what a person can act on — and it is what `look` means when nothing says otherwise. That also turns the exemption the other way round. The dashboard is still allowed to look unlike the product; it just no longer does so by default. An existing dashboard, which has never named a look, lands on the design it had before any of this. Restraint is the style rather than an omission here: no ripple, no glow, no lift, and a press answered by the colour changing. The one deliberate departure is the selector, which holds its choice in `--primary` rather than the `--accent` the segmented rule asks for — that is a decision about the widget, not about the look, and a control must not change what it signals when the drawing changes. All three sets hold it the same way.
740 lines
29 KiB
Python
740 lines
29 KiB
Python
"""Dashboards: what a wall panel shows, and what its buttons do.
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A dashboard is its own document, not a set of nodes placed in a flow. Widgets
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bind to message names — the same names that wire the graph — so a dashboard
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reads across flows without being part of any of them, and a flow stays the
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logic it was.
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Stored beside the flows in the same git repository, under a directory the flow
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listing ignores. Editing is separated from showing, exactly as it is for flows:
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the editor writes ``dashboard.draft.json`` and a wall panel reads only the
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published ``dashboard.json``, so a half-arranged page never reaches the wall.
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Publishing promotes the draft and removes it; a dashboard directory without one
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is simply a dashboard with nothing unpublished. A new dashboard starts as a
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draft alone, so a directory may just as well hold only the draft — a dashboard
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nobody has published yet, which no panel can be shown.
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"""
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from __future__ import annotations
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import threading
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from pathlib import Path
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from typing import Any, Literal
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from pydantic import BaseModel, Field, field_validator, model_validator
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from fluksio.flow.schemas import _validate_name
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from fluksio.flow.store import FlowStore, StaleVersion
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#: Sibling of the shared-node library, and likewise not a flow.
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DASHBOARD_DIR = "_dashboards"
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#: A chart cannot ask for an unbounded series; this is the ceiling.
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HISTORY_CAP = 5000
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#: How many readings one bar draws. Mirrored in the client
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#: (``ui/core/config.ts``, ``MAX_ROWS``).
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#:
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#: It used to be three, and the limit was contrast: the readings were nested
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#: inside one fill and shared a single token, because no slot of the chart ramp
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#: cleared 3:1 against the outer one. A bar now draws a row per reading in the
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#: dashboard's own data colours, so what bounds it is how many tracks stay
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#: legible stacked in one tile.
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BAR_ROWS = 8
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#: Resolved out here on purpose: the store has a ``list`` method, which
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#: shadows the builtin for any annotation written inside the class.
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Bindings = list[dict[str, Any]]
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WidgetType = Literal[
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# Display
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"stat",
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"gauge",
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"chart",
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"markdown",
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"agenda",
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"notification",
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"bar",
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"icon",
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"forecast",
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"clock",
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# Input
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"button",
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"switch",
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"slider",
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"input",
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"dropdown",
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"color",
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]
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INPUT_WIDGETS = {"button", "switch", "slider", "input", "dropdown", "color"}
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#: What a colour widget puts on the wire, by the format it was configured for.
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#: The default is what the Node-RED installation this ports already sends its
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#: DMX encoders — ``[h, s, v]``, hue in degrees and the other two in percent —
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#: and the two alternatives exist because fixtures differ. Mirrored in the
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#: client (``frontend/src/components/Dashboard/ColorWidget.tsx``).
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COLOR_DTYPES = {"hsv": "list", "rgb": "list", "hex": "str"}
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#: What a widget may be pointed at, by payload type. A switch that reads a
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#: float has nothing to show and nothing safe to send, so the pairing belongs
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#: to the document rather than to the editor that happened to write it. Types
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#: missing here take anything. Mirrored in the client
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#: (``frontend/src/components/Dashboard/widgets.tsx``).
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WIDGET_DTYPES: dict[str, set[str]] = {
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"gauge": {"float", "int"},
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# A chart reading the engine's ring. One that queries binds a `series`
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# answer and a `record` request instead, checked separately below.
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"chart": {"float", "int"},
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"slider": {"float", "int"},
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"switch": {"bool"},
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"agenda": {"list"},
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"notification": {"record"},
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"bar": {"float", "int"},
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"forecast": {"list"},
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# Either shape a colour can travel as; which of the two this widget means
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# is its ``format``, checked against ``COLOR_DTYPES`` below.
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"color": {"list", "str"},
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# An icon maps weather strings, bool hints and numbers alike, and a clock
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# binds nothing at all, so neither has a row to be held to.
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}
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#: What a dashboard-wide setting may be bound to, by payload type. The channel
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#: is general — a setting is a value plus an optional binding — but the wired
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#: ones are a closed set, and a name missing here is simply a setting this
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#: build does not act on. Mirrored in the client
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#: (``frontend/src/components/Dashboard/settings.tsx``).
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SETTING_DTYPES: dict[str, str] = {
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# "system" | "light" | "dark". A panel in a room has no way to set the
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# device preference the app otherwise inherits. Idle while a palette is
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# set: that names the ground, so which way it reads is already decided.
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"theme": "str",
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# Read-only: the input widgets stop publishing.
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"locked": "bool",
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# "fluksio" | "material" | "glass": which component set draws this
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# dashboard. Anything else is "fluksio", the app's own design. The three
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# share every feature; only the drawing differs.
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"look": "str",
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# The dashboard's own colours, as an ordered list of hex strings. Position
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# is the role: background, surface, primary, accent, text, and anything
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# after that is another colour for a chart. Trailing roles may be left off
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# and are derived from what is there.
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"palette": "list",
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# An image drawn under the widgets, by URL. A flow publishing to it is what
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# a wallpaper that changes looks like here.
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"background": "str",
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# Bigger controls and no hover states, for a panel that is touched.
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"touch": "bool",
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}
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class SettingDef(BaseModel):
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"""One dashboard-wide setting: a value, and optionally where it comes from.
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Unbound — no ``message`` — the setting is simply ``value``, which is what
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makes a panel that is always dark cost no flow at all. Bound, a flow drives
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it live and ``value`` is the fallback: what the dashboard uses until
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something arrives, and whenever the message is silent.
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A schedule is not a third case. A node publishing to the bound message on a
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cron *is* the schedule, which is the whole reason this is a channel rather
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than a switching rule per setting.
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"""
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value: Any = None
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#: The message that drives it, or empty for a setting that is just a value.
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message: str = ""
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#: The payload type the editor recorded when it bound that message, so the
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#: pairing can be judged from the document alone — the rule widget bindings
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#: are held to.
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dtype: str = ""
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class Placement(BaseModel):
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"""Where a widget sits in its section's grid, in grid units."""
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x: int = 0
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y: int = 0
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w: int = 3
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h: int = 2
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class WidgetDef(BaseModel):
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"""One tile: what it shows or does, and where it sits.
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``config`` is per type — a chart names its series, a button names the
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message it publishes — and is validated against the type below rather than
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by a schema per class, because the whole set is small and closed.
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A chart comes in two kinds. The default reads what the engine kept for a
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message. One with ``source: "query"`` asks instead, and its config is
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``{source, request, request_dtype: "record", message, dtype: "series",
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refresh_s, range_s}``: it publishes ``{range_s, interval_s}`` to
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``request`` exactly as a slider publishes a value, and draws the ``series``
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a flow answers with on ``message``.
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A colour widget picks what it publishes with ``format``, because fixtures
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differ and a change node per tile is not the answer:
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- ``hsv`` (the default) — ``[h, s, v]``, hue 0-360 degrees, saturation and
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value 0-100 percent. What the Node-RED installation this ports feeds its
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3CH/4CH DMX encoders, which divide by 360 and by 100.
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- ``rgb`` — ``[r, g, b]``, each 0-255. The conventional range; the
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reference's own encoders produce it after converting.
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- ``hex`` — ``"#rrggbb"``, lowercase. Conventional likewise.
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The first two are a ``list`` message, the third a ``str``, which is what
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``COLOR_DTYPES`` records and the check below holds a binding to.
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"""
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id: str
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type: WidgetType
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title: str = ""
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#: Keyed by breakpoint (``lg``/``md``/``sm``); missing ones are derived by
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#: the client from the widest one it has.
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layout: dict[str, Placement] = Field(default_factory=dict)
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config: dict[str, Any] = Field(default_factory=dict)
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@field_validator("id")
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@classmethod
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def _check_id(cls, value: str) -> str:
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return _validate_name(value)
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@property
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def _query_chart(self) -> bool:
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"""A chart that asks a flow for its series instead of reading the ring."""
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return self.type == "chart" and self.config.get("source") == "query"
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@property
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def inner_bindings(self) -> Bindings:
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"""A bar's nested readings, as documents written before rows carry them.
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One binding beside ``inner_dtype``, as a bar was written before it
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stacked, or an ordered list of ``{message, dtype}``.
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"""
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inner = self.config.get("inner")
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if isinstance(inner, list):
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return [s for s in inner if isinstance(s, dict)]
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dtype = self.config.get("inner_dtype")
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# A recorded type with nothing bound is still a type to be held to.
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if inner or dtype:
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return [{"message": inner or "", "dtype": dtype}]
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return []
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@property
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def bar_rows(self) -> Bindings:
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"""The readings a bar draws, in every shape a document carries them.
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Current documents write ``rows``. Before that a bar drew one reading
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with up to three nested inside it, which is read here as that reading
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followed by the nested ones — the same set of messages, drawn as
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separate tracks — so an older dashboard keeps working without being
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migrated first.
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"""
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rows = self.config.get("rows")
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if isinstance(rows, list):
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return [row for row in rows if isinstance(row, dict)]
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name = self.config.get("message")
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outer: Bindings = (
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[{"message": name, "dtype": self.config.get("dtype")}] if name else []
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)
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return [*outer, *self.inner_bindings]
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@property
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def messages(self) -> list[str]:
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"""Every message name this widget reads."""
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if self._query_chart:
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name = self.config.get("message")
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return [str(name)] if name else []
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if self.type == "chart":
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return [
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str(series.get("message"))
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for series in self.config.get("series") or []
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if series.get("message")
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]
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if self.type == "bar":
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# A bar draws a row per reading, and each row binds its own.
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return [
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str(row.get("message")) for row in self.bar_rows if row.get("message")
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]
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name = self.config.get("message")
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return [str(name)] if name else []
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@property
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def target(self) -> str:
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"""The message this widget publishes, if it is an input.
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A querying chart is one too: its request is a value it puts into the
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graph, so the canvas draws it as an endpoint like any other control.
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"""
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if self._query_chart:
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return str(self.config.get("request") or "")
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return str(self.config.get("target") or "")
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@property
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def history_points(self) -> int:
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"""How much past this widget needs kept for it.
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Nothing, for a chart that queries: the answer carries its own past, so
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asking the engine to keep a ring as well would store it twice.
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"""
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if self.type != "chart" or self._query_chart:
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return 0
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points = int((self.config.get("history") or {}).get("points") or 0)
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return min(points, HISTORY_CAP)
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@property
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def bound_dtypes(self) -> list[str]:
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"""The payload types this widget was bound to, as the editor recorded.
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Empty for a document written before the editor kept them, which is why
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a missing type is never an error.
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"""
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if self.type == "chart":
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return [
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str(series.get("dtype") or "")
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for series in self.config.get("series") or []
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]
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if self.type == "bar":
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return [str(row.get("dtype") or "") for row in self.bar_rows]
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return [str(self.config.get("dtype") or "")]
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@model_validator(mode="after")
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def _check_binding(self) -> WidgetDef:
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"""Refuse a widget wired to a message it cannot carry."""
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if self._query_chart:
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for key, want in (("dtype", "series"), ("request_dtype", "record")):
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bound = str(self.config.get(key) or "")
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if bound and bound != want:
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raise ValueError(
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f"a querying chart's {key} must be '{want}', not '{bound}'"
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)
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return self
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if self.type == "bar" and len(self.bar_rows) > BAR_ROWS:
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raise ValueError(f"a bar draws at most {BAR_ROWS} readings")
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if self.type == "color":
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# The row above allows both shapes a colour travels as; the format
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# is what decides which of them this widget actually sends. An
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# unknown one is read as the default, exactly as the client does.
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fmt = str(self.config.get("format") or "hsv")
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want = COLOR_DTYPES.get(fmt, "list")
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bound = str(self.config.get("dtype") or "")
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if bound and bound != want:
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raise ValueError(
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f"a colour widget sending {fmt} needs a '{want}' message, "
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f"not a '{bound}'"
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)
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allowed = WIDGET_DTYPES.get(self.type)
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if not allowed:
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return self
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for dtype in self.bound_dtypes:
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if dtype and dtype not in allowed:
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raise ValueError(
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f"a '{self.type}' widget cannot carry a '{dtype}' message"
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)
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return self
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class SectionDef(BaseModel):
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"""A grid of widgets under a heading."""
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id: str
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title: str = ""
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widgets: list[WidgetDef] = Field(default_factory=list)
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@field_validator("id")
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@classmethod
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def _check_id(cls, value: str) -> str:
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return _validate_name(value)
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class PageDef(BaseModel):
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"""One tab of a dashboard."""
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id: str
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title: str = ""
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#: A lucide icon name, or empty.
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icon: str = ""
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sections: list[SectionDef] = Field(default_factory=list)
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@field_validator("id")
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@classmethod
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def _check_id(cls, value: str) -> str:
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return _validate_name(value)
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class DashboardDef(BaseModel):
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"""A dashboard as stored, and as the API hands it over."""
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name: str
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title: str = ""
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#: How many columns the grid is cut into, so a dashboard can be matched to
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#: the panel it will hang on.
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columns: int = Field(default=12, ge=1, le=48)
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#: The panel this dashboard is drawn for, in CSS pixels. Both the editor
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#: and the wall panel scale that surface to fit whatever room they have, so
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#: an arrangement does not depend on the window it was made in. Zero means
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#: "unset" and the client falls back to its default.
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canvas_width: int = Field(default=1920, ge=0, le=7680)
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canvas_height: int = Field(default=1080, ge=0, le=4320)
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#: A lucide icon name, drawn on the panel rail; empty falls back to two
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#: letters of the title.
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icon: str = ""
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pages: list[PageDef] = Field(default_factory=list)
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#: Settings the whole dashboard carries, by name — see ``SettingDef``. The
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#: one channel a dashboard consumes as a dashboard rather than as a set of
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#: tiles, so a screen on a wall can be told things nobody standing at it
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#: could set.
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settings: dict[str, SettingDef] = Field(default_factory=dict)
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#: Bumped on every save; a save based on an older one is refused.
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version: int = 1
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#: Whether there are unpublished changes. Reported by the store on read,
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#: never stored — the draft file's existence is the only record of it.
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has_draft: bool = False
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@field_validator("name")
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@classmethod
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def _check_name(cls, value: str) -> str:
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return _validate_name(value)
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@model_validator(mode="after")
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def _check_settings(self) -> DashboardDef:
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"""Refuse a setting driven by a message it cannot carry.
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Judged from the document alone, exactly as a widget's binding is: the
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picker records the payload type beside the name, so neither the editor
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nor a wall panel has to fetch the catalogue to know the wiring is
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wrong. A name this build does not know is left alone rather than
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refused — an older installation reading a newer document simply does
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not act on it.
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"""
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for name, setting in self.settings.items():
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want = SETTING_DTYPES.get(name)
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if want and setting.dtype and setting.dtype != want:
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raise ValueError(
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f"the '{name}' setting needs a '{want}' message, "
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f"not a '{setting.dtype}'"
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)
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return self
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@property
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def widgets(self) -> list[WidgetDef]:
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return [w for p in self.pages for s in p.sections for w in s.widgets]
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@property
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def setting_messages(self) -> list[str]:
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"""Every message a bound setting reads. Empty for a static dashboard."""
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return [s.message for s in self.settings.values() if s.message]
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class DashboardSummary(BaseModel):
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"""A dashboard in a list, without its contents."""
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name: str
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title: str = ""
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page_count: int = 0
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widget_count: int = 0
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has_draft: bool = False
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#: Of the working copy, so publishing from a list needs no second read.
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version: int = 1
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class DashboardsPublic(BaseModel):
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data: list[DashboardSummary]
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count: int
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class DashboardNotFound(KeyError):
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def __init__(self, name: str) -> None:
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super().__init__(name)
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self.name = name
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class DashboardExists(ValueError):
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def __init__(self, name: str) -> None:
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super().__init__(name)
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self.name = name
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class DashboardStore:
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"""Dashboards in the flow store's repository, invisible to the flow listing.
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Shares the flow store's write lock and commit, so a dashboard save and a
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flow save cannot interleave into one confused commit.
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"""
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def __init__(self, flows: FlowStore) -> None:
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self.flows = flows
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self.root = flows.root / DASHBOARD_DIR
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# Read-modify-write of the version counter, same as the flow store.
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self._lock = threading.Lock()
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def _file(self, name: str) -> Path:
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return self.root / name / "dashboard.json"
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def _draft_file(self, name: str) -> Path:
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return self.root / name / "dashboard.draft.json"
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@staticmethod
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def _dump(defn: DashboardDef) -> str:
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"""What goes on disk. ``has_draft`` is the file layout, not a field."""
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return defn.model_dump_json(indent=2, exclude={"has_draft"})
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def list(self) -> list[DashboardSummary]:
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"""Every dashboard the editor knows, published or not."""
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names = {path.parent.name for path in self.root.glob("*/dashboard.json")}
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names |= {path.parent.name for path in self.root.glob("*/dashboard.draft.json")}
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summaries = []
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for name in sorted(names):
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try:
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defn = self.read(name, draft=True)
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except Exception:
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continue
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summaries.append(
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DashboardSummary(
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name=defn.name,
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title=defn.title,
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page_count=len(defn.pages),
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widget_count=len(defn.widgets),
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has_draft=defn.has_draft,
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version=defn.version,
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)
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)
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return summaries
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def exists(self, name: str) -> bool:
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return self._file(name).exists() or self._draft_file(name).exists()
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def is_published(self, name: str) -> bool:
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"""Is there a document a panel can be shown?"""
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return self._file(name).exists()
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def has_draft(self, name: str) -> bool:
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"""Are there unpublished changes to this dashboard?"""
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return self._draft_file(name).exists()
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def read(self, name: str, draft: bool = False) -> DashboardDef:
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"""The published dashboard, or with ``draft`` the working copy."""
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path = self._draft_file(name) if draft else self._file(name)
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if not path.exists():
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path = self._file(name)
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if not path.exists():
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raise DashboardNotFound(name)
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return DashboardDef.model_validate_json(path.read_text()).model_copy(
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update={"has_draft": self.has_draft(name)}
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)
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def write(
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self, defn: DashboardDef, base_version: int | None = None
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) -> DashboardDef:
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"""Publish a dashboard directly, skipping the draft.
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The API never does: it creates a draft and promotes it. This is for a
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caller that already has the finished document — a test, or a seed.
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"""
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with self._lock, self.flows._write_lock:
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path = self._file(defn.name)
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current = 0
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if path.exists():
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current = DashboardDef.model_validate_json(path.read_text()).version
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if base_version is not None and base_version != current:
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raise StaleVersion(defn.name, current)
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saved = defn.model_copy(update={"version": current + 1, "has_draft": False})
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_text(self._dump(saved))
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self.flows._commit(f"Save dashboard '{defn.name}'")
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return saved
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def write_draft(
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self, defn: DashboardDef, base_version: int | None = None
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) -> DashboardDef:
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"""Save unpublished changes, refusing to overwrite someone else's.
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``base_version`` is the version the editor last saw — of the working
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copy, which is the draft once there is one, and 0 for a dashboard that
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does not exist yet: creating one is its first draft.
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"""
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with self._lock, self.flows._write_lock:
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current = 0
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if self.exists(defn.name):
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current = self.read(defn.name, draft=True).version
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if base_version is not None and base_version != current:
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raise StaleVersion(defn.name, current)
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saved = defn.model_copy(update={"version": current + 1, "has_draft": True})
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path = self._draft_file(defn.name)
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_text(self._dump(saved))
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self.flows._commit(f"Update draft of dashboard '{defn.name}'")
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return saved
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def publish(self, name: str, base_version: int | None = None) -> DashboardDef:
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"""Promote the working copy to what the panels show."""
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with self._lock, self.flows._write_lock:
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current = self.read(name, draft=True)
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if base_version is not None and base_version != current.version:
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raise StaleVersion(name, current.version)
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draft = self._draft_file(name)
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if draft.exists():
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self._file(name).write_text(self._dump(current))
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draft.unlink()
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self.flows._commit(f"Publish dashboard '{name}'")
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return current.model_copy(update={"has_draft": False})
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def discard_draft(self, name: str) -> DashboardDef:
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"""Throw the unpublished changes away and go back to what is shown."""
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with self._lock, self.flows._write_lock:
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draft = self._draft_file(name)
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if draft.exists():
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draft.unlink()
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self.flows._commit(f"Discard draft of dashboard '{name}'")
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return self.read(name)
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def delete(self, name: str) -> None:
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if not self.exists(name):
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raise DashboardNotFound(name)
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path = self._file(name)
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with self.flows._write_lock:
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path.unlink(missing_ok=True)
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self._draft_file(name).unlink(missing_ok=True)
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try:
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path.parent.rmdir()
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except OSError:
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pass
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self.flows._commit(f"Delete dashboard '{name}'")
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def rename(self, name: str, new_name: str) -> DashboardDef:
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defn = self.read(name, draft=True)
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if self.exists(new_name):
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raise DashboardExists(new_name)
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with self.flows._write_lock:
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renamed = defn.model_copy(update={"name": new_name})
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self._file(new_name).parent.mkdir(parents=True, exist_ok=True)
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# Whichever files the dashboard has move; one nobody published yet
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# has only the draft, and renaming it must not publish it.
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if self.is_published(name):
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published = self.read(name).model_copy(update={"name": new_name})
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self._file(new_name).write_text(self._dump(published))
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self._file(name).unlink()
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# An unpublished edit belongs to the dashboard, so it moves too.
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if self.has_draft(name):
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self._draft_file(new_name).write_text(self._dump(renamed))
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self._draft_file(name).unlink()
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try:
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self._file(name).parent.rmdir()
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except OSError:
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pass
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self.flows._commit(f"Rename dashboard '{name}' to '{new_name}'")
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return renamed
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def bindings_for(self, flow: str) -> Bindings:
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"""Every widget bound to a message of ``flow``.
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What the canvas draws as an endpoint: a control that sets one of this
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flow's messages, or a tile that shows one. Without this a dashboard is
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an invisible participant — a value changes and nothing on the canvas
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accounts for it.
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"""
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prefix = f"{flow}."
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found: Bindings = []
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for path in sorted(self.root.glob("*/dashboard.json")):
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try:
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defn = DashboardDef.model_validate_json(path.read_text())
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except Exception:
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continue
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# A bound setting is a consumer too — the dashboard itself reading
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# a message rather than any tile on it — so the canvas accounts for
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# it the same way. ``widget`` is what the endpoint id is built
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# from, and no widget id can collide with it: a dot is not a legal
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# name character.
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for name, setting in defn.settings.items():
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if not setting.message.startswith(prefix):
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continue
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found.append(
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{
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"dashboard": defn.name,
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"dashboard_title": defn.title or defn.name,
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"widget": f"settings.{name}",
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"title": f"{defn.title or defn.name} {name}",
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"type": "setting",
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"provides": "",
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"requires": [setting.message],
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}
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)
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for widget in defn.widgets:
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# A control produces the message; a tile consumes it.
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produces = widget.target if widget.target.startswith(prefix) else ""
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consumes = [m for m in widget.messages if m.startswith(prefix)]
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if not produces and not consumes:
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continue
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found.append(
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{
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"dashboard": defn.name,
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"dashboard_title": defn.title or defn.name,
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"widget": widget.id,
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"title": widget.title or widget.id,
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"type": widget.type,
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"provides": produces,
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"requires": consumes,
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}
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)
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return found
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def history_requirements(self) -> dict[str, int]:
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"""How many points to keep per message, so charts have a past to draw.
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The deepest chart bound to a message wins; a message no chart reads
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keeps the default.
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"""
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limits: dict[str, int] = {}
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for path in self.root.glob("*/dashboard.json"):
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try:
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defn = DashboardDef.model_validate_json(path.read_text())
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except Exception:
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continue
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for widget in defn.widgets:
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points = widget.history_points
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if not points:
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continue
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for message in widget.messages:
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limits[message] = max(limits.get(message, 0), points)
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return limits
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def default_dashboard(name: str) -> DashboardDef:
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"""A new dashboard: one page, one section, nothing in it yet."""
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return DashboardDef(
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name=name,
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title=name.replace("_", " ").capitalize(),
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pages=[PageDef(id="main", title="Overview", sections=[SectionDef(id="main")])],
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)
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__all__ = [
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"BAR_ROWS",
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"COLOR_DTYPES",
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"DASHBOARD_DIR",
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"HISTORY_CAP",
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"INPUT_WIDGETS",
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"SETTING_DTYPES",
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"WIDGET_DTYPES",
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"DashboardDef",
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"DashboardExists",
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"DashboardNotFound",
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"DashboardStore",
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"DashboardSummary",
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"DashboardsPublic",
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"PageDef",
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"Placement",
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"SectionDef",
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"SettingDef",
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"WidgetDef",
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"default_dashboard",
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]
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