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_callers.py
""" Call loop machinery """ from __future__ import annotations from typing import cast from typing import Generator from typing import Mapping from typing import Sequence from typing import Tuple from typing import TYPE_CHECKING from typing import Union from ._result import _raise_wrapfail from ._result import _Result from ._result import HookCallError if TYPE_CHECKING: from ._hooks import HookImpl # Need to distinguish between old- and new-style hook wrappers. # Wrapping one a singleton tuple is the fastest type-safe way I found to do it. Teardown = Union[ Tuple[Generator[None, _Result[object], None]], Generator[None, object, object], ] def _multicall( hook_name: str, hook_impls: Sequence[HookImpl], caller_kwargs: Mapping[str, object], firstresult: bool, ) -> object | list[object]: """Execute a call into multiple python functions/methods and return the result(s). ``caller_kwargs`` comes from _HookCaller.__call__(). """ __tracebackhide__ = True results: list[object] = [] exception = None only_new_style_wrappers = True try: # run impl and wrapper setup functions in a loop teardowns: list[Teardown] = [] try: for hook_impl in reversed(hook_impls): try: args = [caller_kwargs[argname] for argname in hook_impl.argnames] except KeyError: for argname in hook_impl.argnames: if argname not in caller_kwargs: raise HookCallError( f"hook call must provide argument {argname!r}" ) if hook_impl.hookwrapper: only_new_style_wrappers = False try: # If this cast is not valid, a type error is raised below, # which is the desired response. res = hook_impl.function(*args) wrapper_gen = cast(Generator[None, _Result[object], None], res) next(wrapper_gen) # first yield teardowns.append((wrapper_gen,)) except StopIteration: _raise_wrapfail(wrapper_gen, "did not yield") elif hook_impl.wrapper: try: # If this cast is not valid, a type error is raised below, # which is the desired response. res = hook_impl.function(*args) function_gen = cast(Generator[None, object, object], res) next(function_gen) # first yield teardowns.append(function_gen) except StopIteration: _raise_wrapfail(function_gen, "did not yield") else: res = hook_impl.function(*args) if res is not None: results.append(res) if firstresult: # halt further impl calls break except BaseException as exc: exception = exc finally: # Fast path - only new-style wrappers, no _Result. if only_new_style_wrappers: if firstresult: # first result hooks return a single value result = results[0] if results else None else: result = results # run all wrapper post-yield blocks for teardown in reversed(teardowns): try: if exception is not None: teardown.throw(exception) # type: ignore[union-attr] else: teardown.send(result) # type: ignore[union-attr] # Following is unreachable for a well behaved hook wrapper. # Try to force finalizers otherwise postponed till GC action. # Note: close() may raise if generator handles GeneratorExit. teardown.close() # type: ignore[union-attr] except StopIteration as si: result = si.value exception = None continue except BaseException as e: exception = e continue _raise_wrapfail(teardown, "has second yield") # type: ignore[arg-type] if exception is not None: raise exception.with_traceback(exception.__traceback__) else: return result # Slow path - need to support old-style wrappers. else: if firstresult: # first result hooks return a single value outcome: _Result[object | list[object]] = _Result( results[0] if results else None, exception ) else: outcome = _Result(results, exception) # run all wrapper post-yield blocks for teardown in reversed(teardowns): if isinstance(teardown, tuple): try: teardown[0].send(outcome) _raise_wrapfail(teardown[0], "has second yield") except StopIteration: pass else: try: if outcome._exception is not None: teardown.throw(outcome._exception) else: teardown.send(outcome._result) # Following is unreachable for a well behaved hook wrapper. # Try to force finalizers otherwise postponed till GC action. # Note: close() may raise if generator handles GeneratorExit. teardown.close() except StopIteration as si: outcome.force_result(si.value) continue except BaseException as e: outcome.force_exception(e) continue _raise_wrapfail(teardown, "has second yield") return outcome.get_result()
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