stroblmeandClaude Opus 5
4941c2787c
Two halves of the same gap: the CLI could start work but not show you any. `fluksio status` draws the home screen's top half in a terminal — health and what is wrong with it, every flow with its state and node count, and the recent runs and failures under them. `--watch` keeps it there. Rich does the drawing; it was already installed under fastapi's own CLI, and is named now because a command depends on it. `fluksio run` with no parameters at a terminal asks for them, one line per declared input with its declared value in brackets — so Enter through the lot is what running the defaults looks like, and an artifact input takes the `@run:` spelling the engine now resolves. A scripted run is untouched: passing any parameter, or piping the command, skips the questions, as does --defaults. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019V5bsYGNxcgPs4xXmTPx69
740 lines
27 KiB
Python
740 lines
27 KiB
Python
"""Declare flows and nodes in the repository you already have.
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A research repository keeps its functions where they are; the decorators here
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say which of them are nodes and which nodes make up a flow. ``fluksio sync``
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uploads the flow document and, per node, a generated import shim — so the flow
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store still holds a complete, runnable, git-versioned definition, and the code
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it imports stays yours.
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Nothing here imports the engine. A ``from fluksio import node`` in a training
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script must not drag FastAPI and SQLAlchemy in behind it, and the same names
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have to resolve inside a worker, where ``fluksio`` is the reporter module.
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"""
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from __future__ import annotations
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import ast
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import inspect
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import json
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import re
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import textwrap
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import warnings
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from collections.abc import Callable, Sequence
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from pathlib import Path
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from typing import Any, TypeVar
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__all__ = [
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"FLOWS",
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"Flow",
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"Port",
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"SyncError",
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"build",
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"node",
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"shims",
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"use",
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]
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F = TypeVar("F", bound=Callable[..., Any])
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#: Mirrors :class:`fluksio.flow.messages.DType`. Mirrored rather than imported:
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#: importing it would pull the engine into a research process.
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DTYPES = frozenset(
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{"float", "int", "str", "bool", "json", "series", "record", "list", "artifact"}
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)
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#: What a list may hold, mirroring ``messages._ITEM_TYPES``.
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ITEM_TYPES = frozenset({"float", "int", "str", "bool", "json", "record"})
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#: Settings the engine reads itself, mirroring ``nodes.base.RESERVED_SETTINGS``.
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RESERVED_SETTINGS = frozenset({"synchronous"})
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#: Mirrors ``fluksio.flow.schemas.NAME_PATTERN``.
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NAME_PATTERN = re.compile(r"^[a-z][a-z0-9_]*$")
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#: First line of every generated node body. Its absence is how ``sync`` knows a
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#: node's source was edited on the canvas.
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MARKER = "# generated by fluksio sync"
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class SyncError(Exception):
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"""A declaration the engine would refuse, caught where it was written."""
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#: Every flow declared in the modules imported so far. ``fluksio sync`` reads it.
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FLOWS: dict[str, Flow] = {}
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def _name(value: str, what: str) -> str:
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if not NAME_PATTERN.match(value):
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raise SyncError(
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f"{what} '{value}': use lowercase letters, digits and underscores, "
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"starting with a letter"
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)
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return value
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class Port:
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"""One port of a node, and the message it binds to.
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A thin mirror of :class:`fluksio.flow.messages.MessageSpec`. ``name`` is
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the wiring — two nodes are connected because one provides the name another
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requires — and ``port`` is what the function calls its parameter, which
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defaults to the name.
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"""
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def __init__(
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self,
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name: str,
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dtype: str | None = None,
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*,
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port: str = "",
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stream: bool = False,
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initial: Any = None,
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item: str | None = None,
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interval: float = 0.0,
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trigger: bool = True,
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) -> None:
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#: Whether the caller said the type or left it to be resolved from
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#: whoever provides the message. A message has one type, declared where
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#: it is produced; requiring it does not mean declaring it again.
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self.explicit = dtype is not None
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dtype = dtype or "float"
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if dtype not in DTYPES:
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raise SyncError(f"port '{name}': unknown type '{dtype}'")
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if item is not None and item not in ITEM_TYPES:
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raise SyncError(f"port '{name}': a list cannot hold '{item}' items")
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if interval < 0:
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raise SyncError(f"port '{name}': interval cannot be negative")
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self.name = name
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self.dtype = dtype
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self.port = port or name.rsplit(".", 1)[-1]
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self.stream = stream
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self.initial = initial
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self.item = item
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self.interval = interval
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self.trigger = trigger
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if not self.port.isidentifier():
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raise SyncError(
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f"port '{name}': '{self.port}' is not a Python identifier, so no "
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"parameter can carry it — pass port='...'"
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)
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def spec(self) -> dict[str, Any]:
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"""The ``MessageSpec`` this port serialises to."""
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out: dict[str, Any] = {
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"name": self.name,
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"port": self.port,
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"dtype": self.dtype,
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"interval": self.interval,
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"trigger": self.trigger,
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"stream": self.stream,
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}
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if self.item is not None:
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out["item"] = self.item
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return out
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def replace(self, name: str = "") -> Port:
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"""A copy of this port, optionally bound to a different message."""
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copy = Port(
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name or self.name,
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self.dtype,
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port=self.port,
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stream=self.stream,
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initial=self.initial,
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item=self.item,
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interval=self.interval,
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trigger=self.trigger,
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)
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copy.explicit = self.explicit
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return copy
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def __repr__(self) -> str:
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return f"Port({self.name!r}, {self.dtype!r})"
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def _ports(value: Sequence[str | Port] | str | Port) -> tuple[list[Port], bool]:
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"""Normalise a ports declaration; the flag says it was a single port.
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A single ``Port`` rather than a list of one is the opt-in to a bare return:
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the shim wraps the value in the dict the engine expects. It has to be
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explicit, because an artifact reference is itself a dict and a dict whose
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keys match no port is dropped in silence.
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"""
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if isinstance(value, (str, Port)):
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return [value if isinstance(value, Port) else Port(value)], True
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return [item if isinstance(item, Port) else Port(item) for item in value], False
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class NodeSpec:
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"""What ``@node`` recorded about a function."""
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def __init__(
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self,
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fn: Callable[..., Any],
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*,
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id: str,
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requires: list[Port],
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provides: list[Port],
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single: bool,
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settings: dict[str, Any],
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title: str,
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timeout: float | None,
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device: str | None,
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device_policy: str,
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cache: bool = True,
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) -> None:
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self.fn = fn
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self.id = id
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self.requires = requires
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self.provides = provides
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self.single = single
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self.settings = settings
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self.title = title
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self.timeout = timeout
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self.device = device
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self.device_policy = device_policy
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self.cache = cache
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def rebind(
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self, *, id: str = "", wire: dict[str, str] | None = None, **settings: Any
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) -> NodeSpec:
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"""A copy of this node wired and configured for one flow."""
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wire = wire or {}
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known = {port.port for port in self.requires} | {p.port for p in self.provides}
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unknown = sorted(set(wire) - known)
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if unknown:
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raise SyncError(
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f"node '{self.id}': wire={{'{unknown[0]}': ...}} names no port of it "
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f"(it has {', '.join(sorted(known)) or 'none'})"
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)
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# Copied rather than shared: the same decorated function appears in
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# several flows, and each resolves its own port types.
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def rewire(ports: list[Port]) -> list[Port]:
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return [port.replace(wire.get(port.port, "")) for port in ports]
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return NodeSpec(
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self.fn,
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id=_name(id, "node id") if id else self.id,
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requires=rewire(self.requires),
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provides=rewire(self.provides),
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single=self.single,
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settings={**self.settings, **settings},
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title=self.title,
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timeout=self.timeout,
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device=self.device,
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device_policy=self.device_policy,
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cache=self.cache,
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)
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class NodeUse:
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"""One use of a decorated function in one flow — see :func:`use`."""
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def __init__(
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self,
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fn: Callable[..., Any],
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*,
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id: str = "",
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wire: dict[str, str] | None = None,
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settings: dict[str, Any] | None = None,
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) -> None:
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self.fn = fn
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self.id = id
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self.wire = wire
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self.settings = settings or {}
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def node(
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*,
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requires: Sequence[str | Port] = (),
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provides: Sequence[str | Port] | str | Port = (),
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id: str = "",
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settings: dict[str, Any] | None = None,
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title: str = "",
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timeout: float | None = None,
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device: str | None = None,
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device_policy: str = "require",
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cache: bool = True,
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) -> Callable[[F], F]:
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"""Mark a function as a node, declaring its ports.
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The function is returned untouched: it is still callable, testable and
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importable as what it was. A bare string in ``requires`` or ``provides`` is
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shorthand for a ``float`` port of that name.
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Parameters with a default that are not ports become the node's settings, so
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the canvas can tune them without editing code. ``device`` picks the worker
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the code runs on — ``"gpu"``, say — and ``device_policy="prefer"`` runs it
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locally when no such worker is attached rather than waiting for one.
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A batch run skips this node when an earlier one already ran the same source
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with the same settings and the same input values, and restores what it
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returned. ``cache=False`` says not to: the answer can change on its own.
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``timeout`` is seconds of silence — a yield or an emit resets it — after
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which the node is stopped. Left out it inherits the engine's default, which
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is no limit; set one where silence means stuck rather than working.
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"""
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if device_policy not in ("require", "prefer"):
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raise SyncError("device_policy is 'require' or 'prefer'")
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if timeout is not None and timeout < 0:
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raise SyncError(
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f"node timeout must be 0 or more (0 disables it), got {timeout}"
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)
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def decorate(fn: F) -> F:
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required, _ = _ports(requires)
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provided, single = _ports(provides)
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spec = NodeSpec(
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fn,
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id=_name(id or fn.__name__, "node id"),
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requires=required,
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provides=provided,
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single=single,
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settings=dict(settings or {}),
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title=title,
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timeout=timeout,
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device=device,
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device_policy=device_policy,
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cache=cache,
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)
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_check_signature(spec)
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fn.__fluksio__ = spec # type: ignore[attr-defined]
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return fn
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return decorate
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def use(
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fn: Callable[..., Any],
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*,
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id: str = "",
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wire: dict[str, str] | None = None,
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**settings: Any,
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) -> NodeUse:
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"""The same node, wired or configured differently in this flow.
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``wire={"dataset": "augmented"}`` binds the ``dataset`` port to another
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message; keyword arguments override settings. Give ``id`` when one function
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appears twice in one flow.
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"""
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return NodeUse(fn, id=id, wire=wire, settings=settings)
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def _spec_of(entry: Callable[..., Any] | NodeUse) -> NodeSpec:
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fn = entry.fn if isinstance(entry, NodeUse) else entry
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spec = getattr(fn, "__fluksio__", None)
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if not isinstance(spec, NodeSpec):
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raise SyncError(
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f"{getattr(fn, '__name__', fn)!r} is not a node — decorate it with @node()"
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)
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if isinstance(entry, NodeUse):
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return spec.rebind(id=entry.id, wire=entry.wire, **entry.settings)
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return spec.rebind()
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def _check_signature(spec: NodeSpec) -> None:
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"""Whether the declaration matches the function it is on.
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Raised where the decorator is rather than where the flow is: this is a
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disagreement between a function and its own ports, and the engine would
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otherwise only find it when the node is first called.
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"""
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fn, where = spec.fn, f"node '{spec.id}'"
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if inspect.iscoroutinefunction(fn):
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raise SyncError(f"{where}: async functions cannot be nodes")
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if fn.__module__ == "__main__":
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raise SyncError(
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f"{where}: {fn.__name__}() is defined in a script run directly, so the "
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"generated node could not import it — put it in an importable module"
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)
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generator = inspect.isgeneratorfunction(fn)
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if generator and spec.single:
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raise SyncError(
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f"{where}: {fn.__name__}() yields, so it says which port each value is "
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f"on — pass provides=[Port(...)] rather than a single port"
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)
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signature = inspect.signature(fn)
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parameters = signature.parameters
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var_keyword = any(
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p.kind is inspect.Parameter.VAR_KEYWORD for p in parameters.values()
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)
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ports = {port.port for port in spec.requires}
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for port in ports:
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if port not in parameters and not var_keyword:
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raise SyncError(
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f"{where}: port '{port}' has no parameter to arrive in — "
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f"{fn.__name__}({', '.join(parameters)}) takes no such argument"
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)
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for name, parameter in parameters.items():
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if parameter.kind is inspect.Parameter.VAR_POSITIONAL:
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raise SyncError(f"{where}: *{name} cannot be filled from ports")
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if parameter.kind is inspect.Parameter.VAR_KEYWORD or name in ports:
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continue
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if parameter.default is inspect.Parameter.empty:
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raise SyncError(
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f"{where}: parameter '{name}' is neither a port nor a setting — "
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f"add Port('{name}', ...) to requires=, or give it a default"
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)
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_check_emissions(spec)
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def _check_emissions(spec: NodeSpec) -> None:
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"""Whether what the function yields is what it says it provides.
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The engine refuses an undeclared key at the first yield, which is right but
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late: a sweep can be an hour in. Only literal keys are read here — a yield
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of a name the code computes is left to the engine — so this catches the
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mistake it is for, which is a typo.
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"""
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provided = {port.port for port in spec.provides}
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try:
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tree = ast.parse(textwrap.dedent(inspect.getsource(spec.fn)))
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except (OSError, TypeError, SyntaxError):
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# No source to read: a function built at runtime, or one from a
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# console. Not a reason to refuse it.
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return
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for key in _emitted_keys(tree):
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if key not in provided:
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declared = ", ".join(sorted(provided)) or "none"
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raise SyncError(
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f"node '{spec.id}': {spec.fn.__name__}() emits '{key}', which no "
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f"port declares. Its ports are: {declared}."
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)
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def _emitted_keys(tree: ast.AST) -> list[str]:
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"""Literal port names a function yields or emits, its own only.
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A nested function is somebody else's ports — a helper generator yielding
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pairs is not this node emitting them — so the walk stops at one.
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"""
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keys: list[str] = []
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# Each branch carries whether it is already inside the node's own function,
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# so the first def is the node and any def below it is a helper.
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stack: list[tuple[ast.AST, bool]] = [(tree, False)]
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while stack:
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node, inside = stack.pop()
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if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef, ast.Lambda)):
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if inside:
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continue
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inside = True
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if isinstance(node, ast.Yield) and isinstance(node.value, ast.Dict):
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keys += [
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key.value
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for key in node.value.keys
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if isinstance(key, ast.Constant) and isinstance(key.value, str)
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]
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elif isinstance(node, ast.Call) and _is_emit(node.func):
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keys += [kw.arg for kw in node.keywords if kw.arg]
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stack += [(child, inside) for child in ast.iter_child_nodes(node)]
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return keys
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def _is_emit(func: ast.expr) -> bool:
|
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"""``emit(...)`` or ``fluksio.emit(...)``, however it was imported."""
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if isinstance(func, ast.Name):
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return func.id == "emit"
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return isinstance(func, ast.Attribute) and func.attr == "emit"
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def _check(spec: NodeSpec, mode: str) -> dict[str, Any]:
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"""The node as stored, with the settings and wiring of one flow.
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Mirrors ``FlowController._build_node`` and ``flow.runs.batch_issues``. Kept
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apart from the signature check because ``use(fn, epochs=3)`` adds settings
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per flow, so this is the first point at which they are all known.
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"""
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fn, where = spec.fn, f"node '{spec.id}'"
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parameters = inspect.signature(fn).parameters
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var_keyword = any(
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p.kind is inspect.Parameter.VAR_KEYWORD for p in parameters.values()
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)
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ports = {port.port for port in spec.requires}
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params: dict[str, Any] = {}
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for name, parameter in parameters.items():
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if name in ports or parameter.default is inspect.Parameter.empty:
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continue
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if name in RESERVED_SETTINGS:
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continue
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if _serialisable(parameter.default):
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params[name] = parameter.default
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for name, value in spec.settings.items():
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if name in ports:
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raise SyncError(
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f"{where}: '{name}' is both a port and a setting — a node reads its "
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"settings beside its ports, so the names have to differ"
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)
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if name in RESERVED_SETTINGS:
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raise SyncError(f"{where}: '{name}' is a setting the engine reads itself")
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if name not in parameters and not var_keyword:
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raise SyncError(
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f"{where}: setting '{name}' is not a parameter of {fn.__name__}()"
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)
|
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if not _serialisable(value):
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raise SyncError(
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f"{where}: setting '{name}' is not JSON — settings are stored with "
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"the flow, so they have to survive a round trip"
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)
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params[name] = value
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if mode == "batch":
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for port in spec.requires + spec.provides:
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if port.interval > 0 and not port.stream:
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raise SyncError(
|
|
f"{where}: port '{port.port}' has interval={port.interval} but a "
|
|
"batch run delivers once — drop it, or declare stream=True"
|
|
)
|
|
|
|
return {
|
|
"id": spec.id,
|
|
"type": "python",
|
|
"title": spec.title,
|
|
"params": params,
|
|
"requires": [port.spec() for port in spec.requires],
|
|
"provides": [port.spec() for port in spec.provides],
|
|
"timeout": spec.timeout,
|
|
"device": spec.device,
|
|
"device_policy": spec.device_policy,
|
|
"cache": spec.cache,
|
|
}
|
|
|
|
|
|
def _serialisable(value: Any) -> bool:
|
|
try:
|
|
json.dumps(value)
|
|
except (TypeError, ValueError):
|
|
return False
|
|
return True
|
|
|
|
|
|
class Flow:
|
|
"""A flow: which nodes are in it, what it takes and what it reports."""
|
|
|
|
def __init__(
|
|
self,
|
|
name: str,
|
|
*,
|
|
nodes: Sequence[Callable[..., Any] | NodeUse],
|
|
mode: str = "batch",
|
|
inputs: Sequence[Port] = (),
|
|
outputs: Sequence[str] = (),
|
|
title: str = "",
|
|
) -> None:
|
|
"""Declare a flow over decorated functions, and register it for sync.
|
|
|
|
``nodes`` is the membership: any decorated function, from anywhere in
|
|
the repository. Wiring is not membership — nodes connect because one
|
|
provides a message another requires, never because one imported the
|
|
other. Wrap an entry in :func:`use` to rebind or reconfigure it here
|
|
without touching the other flows using it.
|
|
"""
|
|
if mode not in ("batch", "live"):
|
|
raise SyncError(f"flow '{name}': mode is 'batch' or 'live'")
|
|
self.name = _name(name, "flow name")
|
|
self.title = title
|
|
self.mode = mode
|
|
self.inputs = list(inputs)
|
|
self.outputs = list(outputs)
|
|
self.nodes = [_spec_of(entry) for entry in nodes]
|
|
self._resolve_types()
|
|
self._validate()
|
|
self._nodes = [_check(spec, mode) for spec in self.nodes]
|
|
self._register()
|
|
|
|
def _register(self) -> None:
|
|
"""Put this flow where `fluksio sync` will find it."""
|
|
existing = FLOWS.get(self.name)
|
|
if existing is not None and existing is not self:
|
|
warnings.warn(
|
|
f"two flows are called '{self.name}'; the later one wins, and only "
|
|
"it will be synced",
|
|
stacklevel=3,
|
|
)
|
|
FLOWS[self.name] = self
|
|
|
|
def _resolve_types(self) -> None:
|
|
"""Give every required port the type of the message it reads.
|
|
|
|
A message has one type, declared once by whoever produces it. Requiring
|
|
it is not a second declaration, so `requires=["dataset"]` takes the
|
|
artifact type from the node providing `dataset` rather than defaulting
|
|
to a float the engine would then refuse at run time. Spelling the type
|
|
out on both sides is still allowed — and a disagreement is an error,
|
|
because one of the two is wrong about what it is handling.
|
|
"""
|
|
declared: dict[str, Port] = {}
|
|
for port in self.inputs:
|
|
declared.setdefault(port.name, port)
|
|
for spec in self.nodes:
|
|
for port in spec.provides:
|
|
declared.setdefault(port.name, port)
|
|
for spec in self.nodes:
|
|
for port in spec.requires:
|
|
source = declared.get(port.name)
|
|
if source is None:
|
|
continue
|
|
if not port.explicit:
|
|
port.dtype = source.dtype
|
|
port.item = source.item
|
|
elif port.dtype != source.dtype:
|
|
raise SyncError(
|
|
f"flow '{self.name}': node '{spec.id}' reads '{port.name}' as "
|
|
f"{port.dtype}, but it is provided as {source.dtype}"
|
|
)
|
|
|
|
def _validate(self) -> None:
|
|
seen: set[str] = set()
|
|
for spec in self.nodes:
|
|
if spec.id in seen:
|
|
raise SyncError(
|
|
f"flow '{self.name}': two nodes are called '{spec.id}' — "
|
|
"pass use(fn, id='...') to tell them apart"
|
|
)
|
|
seen.add(spec.id)
|
|
|
|
produced: dict[str, list[str]] = {}
|
|
for spec in self.nodes:
|
|
for port in spec.provides:
|
|
produced.setdefault(port.name, []).append(spec.id)
|
|
for name, writers in produced.items():
|
|
if len(writers) > 1:
|
|
warnings.warn(
|
|
f"flow '{self.name}': {', '.join(writers)} all publish "
|
|
f"'{name}', so a reader gets whichever ran last",
|
|
stacklevel=4,
|
|
)
|
|
|
|
available = set(produced) | {port.name for port in self.inputs}
|
|
for spec in self.nodes:
|
|
for port in spec.requires:
|
|
if "." in port.name or port.name in available:
|
|
continue
|
|
raise SyncError(
|
|
f"flow '{self.name}': node '{spec.id}' requires '{port.name}', "
|
|
"which no node in it provides and no input declares"
|
|
)
|
|
for output in self.outputs:
|
|
if output not in available:
|
|
raise SyncError(
|
|
f"flow '{self.name}': output '{output}' is not produced by any "
|
|
"of its nodes"
|
|
)
|
|
|
|
def document(self, origin: dict[str, Any] | None = None) -> dict[str, Any]:
|
|
"""The flow document to store, without a version — sync sets that."""
|
|
doc: dict[str, Any] = {
|
|
"name": self.name,
|
|
"title": self.title,
|
|
"mode": self.mode,
|
|
"nodes": self._nodes,
|
|
"inputs": [
|
|
{"spec": port.spec(), "initial": port.initial} for port in self.inputs
|
|
],
|
|
"outputs": self.outputs,
|
|
}
|
|
if origin is not None:
|
|
doc["origin"] = origin
|
|
return doc
|
|
|
|
def shims(self) -> dict[str, str]:
|
|
"""One generated node body per node, keyed by node id."""
|
|
return {spec.id: _shim(spec) for spec in self.nodes}
|
|
|
|
def submit(
|
|
self, *, seed: int | None = None, client: Any = None, **params: Any
|
|
) -> Any:
|
|
"""Start a run of this flow and hand back a handle to it."""
|
|
from fluksio.sdk.client import Client
|
|
|
|
return (client or Client()).submit(self.name, params, seed=seed)
|
|
|
|
def runs(self, limit: int = 20, client: Any = None) -> list[dict[str, Any]]:
|
|
"""This flow's runs, newest first."""
|
|
from fluksio.sdk.client import Client
|
|
|
|
rows: list[dict[str, Any]] = (client or Client()).runs(
|
|
flow=self.name, limit=limit
|
|
)
|
|
return rows
|
|
|
|
def __repr__(self) -> str:
|
|
return f"Flow({self.name!r}, nodes={[n.id for n in self.nodes]})"
|
|
|
|
|
|
def build(target: Flow, origin: dict[str, Any] | None = None) -> dict[str, Any]:
|
|
"""The flow document for a flow — checked, without a version."""
|
|
return target.document(origin)
|
|
|
|
|
|
def shims(target: Flow) -> dict[str, str]:
|
|
"""The generated node bodies for a flow."""
|
|
return target.shims()
|
|
|
|
|
|
def import_root(fn: Callable[..., Any]) -> str:
|
|
"""The directory that has to be on the path for ``fn`` to be importable.
|
|
|
|
Its module's dotted name says how deep in a package it sits, so counting
|
|
the segments back up from the file lands on the directory the import
|
|
resolves against — which is not always the repository root, and is what a
|
|
generated shim actually needs.
|
|
"""
|
|
source = inspect.getsourcefile(fn)
|
|
if not source:
|
|
return ""
|
|
path = Path(source).resolve()
|
|
for _ in fn.__module__.split("."):
|
|
path = path.parent
|
|
return str(path)
|
|
|
|
|
|
def _shim(spec: NodeSpec) -> str:
|
|
"""The node body the store keeps: an import of the real function.
|
|
|
|
The store therefore still holds a complete, runnable definition — the body
|
|
simply happens to be generated, which is why it says so and says where the
|
|
real thing is.
|
|
"""
|
|
fn = spec.fn
|
|
where = inspect.getsourcefile(fn) or fn.__module__
|
|
repo = import_root(fn)
|
|
ports = [port.port for port in spec.requires]
|
|
signature = ", ".join(ports + ["**settings"])
|
|
arguments = ", ".join([f"{port}={port}" for port in ports] + ["**settings"])
|
|
call = f"{fn.__name__}({arguments})"
|
|
|
|
lines = [
|
|
f"{MARKER} from {where} — edit that file instead",
|
|
"import sys",
|
|
"",
|
|
]
|
|
if repo:
|
|
# ponytail: the repository is on the path because the shim puts it
|
|
# there. An editable install (`-e /repo` in the Modules manifest, or a
|
|
# VCS requirement on a remote worker) makes these three lines a no-op.
|
|
lines += [
|
|
f"_REPO = {repo!r}",
|
|
"if _REPO not in sys.path:",
|
|
" sys.path.insert(0, _REPO)",
|
|
"",
|
|
]
|
|
lines += [
|
|
f"from {fn.__module__} import {fn.__name__}",
|
|
"",
|
|
"",
|
|
f"def process({signature}):",
|
|
]
|
|
if inspect.isgeneratorfunction(fn):
|
|
# `return (yield from ...)`, not a bare `yield from`: the delegating
|
|
# form is what carries the generator's own return value out, and that
|
|
# return value is everything the node produces at the end.
|
|
lines.append(f" return (yield from {call})")
|
|
elif spec.single:
|
|
lines.append(f" return {{{spec.provides[0].port!r}: {call}}}")
|
|
else:
|
|
lines.append(f" return {call}")
|
|
return "\n".join(lines) + "\n"
|