Add a runs screen: a table, a run in full, and curves side by side

backend/fluksio/api/routes/dashboards.py

@@ -14,9 +14,11 @@ from fluksio.flow.dashboards import (
     DashboardNotFound,
     DashboardsPublic,
     default_dashboard,
+    results_dashboard,
+    results_name,
 )
 from fluksio.flow.events import event_bus
-from fluksio.flow.store import StaleVersion
+from fluksio.flow.store import FlowNotFound, StaleVersion
 from fluksio.models import Message
 
 router = APIRouter(
@@ -73,6 +75,40 @@ async def create_dashboard(name: str, store: DashboardStoreDep) -> Any:
     return await run_in_threadpool(store.write_draft, defn, 0)
 
 
+@router.post("/from-flow/{flow}", response_model=DashboardDef)
+async def generate_results_dashboard(
+    flow: str,
+    store: DashboardStoreDep,
+    controller: FlowControllerDep,
+) -> Any:
+    """Draw a batch flow's results as a dashboard, from the ports it declares.
+
+    Published straight away rather than left as a draft: there is nothing to
+    review that the flow did not already say, and what makes it useful is
+    being able to open it against a run immediately. It is an ordinary
+    dashboard afterwards — editing it is how it stops being generic.
+    """
+    try:
+        definition = await run_in_threadpool(controller.store.read_flow, flow)
+    except FlowNotFound:
+        raise HTTPException(status_code=404, detail=f"No flow named '{flow}'")
+    if definition.mode != "batch":
+        raise HTTPException(
+            status_code=422,
+            detail=f"'{flow}' is a live flow; a results dashboard is a run's view",
+        )
+    name = results_name(flow)
+    if await run_in_threadpool(store.exists, name):
+        raise HTTPException(status_code=409, detail=f"'{name}' already exists")
+
+    written = await run_in_threadpool(store.write, results_dashboard(definition))
+    await run_in_threadpool(_apply_history_limits, store, controller)
+    event_bus.publish(
+        {"type": "dashboard_changed", "dashboard": name, "ts": time.time()}
+    )
+    return written
+
+
 @router.put("/{name}", response_model=DashboardDef)
 async def save_dashboard(
     name: str,

backend/fluksio/flow/dashboards.py

@@ -23,7 +23,8 @@ from typing import Any, Literal
 
 from pydantic import BaseModel, Field, field_validator, model_validator
 
-from fluksio.flow.schemas import _validate_name
+from fluksio.flow.messages import DType, qualify
+from fluksio.flow.schemas import FlowDef, _validate_name
 from fluksio.flow.store import FlowStore, StaleVersion
 
 #: Sibling of the shared-node library, and likewise not a flow.
@@ -716,6 +717,105 @@ def default_dashboard(name: str) -> DashboardDef:
     )
 
 
+#: What the generated dashboard is called, for a flow of this name.
+def results_name(flow: str) -> str:
+    return f"{flow}_results"
+
+
+#: Numbers a stat or a chart can draw.
+_NUMERIC = {DType.FLOAT, DType.INT}
+
+
+def results_dashboard(flow: FlowDef) -> DashboardDef:
+    """A results dashboard for a batch flow, from the ports it declares.
+
+    A streaming output is a curve and gets a chart; a scalar output is a
+    number and gets a stat. Nothing here is specific to runs: the widgets bind
+    to the flow's own message names, which is what makes the same page draw a
+    run live, draw a finished one when opened in a run's context, and stay an
+    ordinary dashboard anyone can edit afterwards.
+
+    A starting point rather than a finished page — which is the only reason
+    generating one is worth doing at all.
+    """
+    charts = [
+        spec
+        for node in flow.nodes
+        for spec in node.provides
+        if spec.stream and spec.dtype in _NUMERIC and spec.name
+    ]
+    # What a run reports. Declared outputs are unqualified names; an empty list
+    # means "everything the flow ends up holding", which is not a set this can
+    # enumerate, so it draws no stats rather than guessing at them.
+    produced = {
+        spec.name.rsplit(".", 1)[-1]: spec
+        for node in flow.nodes
+        for spec in node.provides
+        if spec.name
+    }
+    stats = [
+        produced[name]
+        for name in flow.outputs
+        if name in produced and not produced[name].stream
+    ]
+
+    widgets: list[WidgetDef] = []
+    for index, spec in enumerate(charts):
+        widgets.append(
+            WidgetDef(
+                id=f"chart_{spec.port or index}",
+                type="chart",
+                title=spec.port or spec.name,
+                layout={"lg": Placement(x=0, y=index * 4, w=8, h=4)},
+                config={
+                    "series": [
+                        {
+                            "message": qualify(flow.name, spec.name),
+                            "dtype": spec.dtype.value,
+                            "label": spec.port or spec.name,
+                        }
+                    ],
+                    "history": {"points": 600},
+                },
+            )
+        )
+
+    row = 0
+    for spec in stats:
+        if spec.dtype is DType.RECORD:
+            kind: WidgetType = "notification"
+        elif spec.dtype in _NUMERIC or spec.dtype is DType.STR:
+            kind = "stat"
+        else:
+            # A list, a series or an artifact has no single reading to show.
+            continue
+        widgets.append(
+            WidgetDef(
+                id=f"out_{spec.port}",
+                type=kind,
+                title=spec.port,
+                layout={"lg": Placement(x=8, y=row * 2, w=4, h=2)},
+                config={
+                    "message": qualify(flow.name, spec.name),
+                    "dtype": spec.dtype.value,
+                },
+            )
+        )
+        row += 1
+
+    return DashboardDef(
+        name=results_name(flow.name),
+        title=f"{flow.title or flow.name} results",
+        pages=[
+            PageDef(
+                id="main",
+                title="Results",
+                sections=[SectionDef(id="main", widgets=widgets)],
+            )
+        ],
+    )
+
+
 __all__ = [
     "BAR_ROWS",
     "COLOR_DTYPES",