Function _stream

src/flask/templating.py:166–186

(
    app: Flask, template: Template, context: dict[str, t.Any]
)

def _stream(
    app: Flask, template: Template, context: dict[str, t.Any]
) -> t.Iterator[str]:
    app.update_template_context(context)
    before_render_template.send(
        app, _async_wrapper=app.ensure_sync, template=template, context=context
    )

    def generate() -> t.Iterator[str]:
        yield from template.generate(context)
        template_rendered.send(
            app, _async_wrapper=app.ensure_sync, template=template, context=context
        )

    rv = generate()

    # If a request context is active, keep it while generating.
    if request:
        rv = stream_with_context(rv)

    return rv


def stream_template(