# Copyright 2021 Zilliz. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from functools import wraps
from typing import Optional
import threading
import contextvars
import contextlib
import towhee.runtime.pipeline_loader as pipe_loader
from towhee.utils.log import engine_log
_AUTO_PIPES_VAR: contextvars.ContextVar = contextvars.ContextVar('auto_pipes_var')
@contextlib.contextmanager
def set_pipe_name(name: str):
token = _AUTO_PIPES_VAR.set(name)
yield
_AUTO_PIPES_VAR.reset(token)
def get_pipe_name():
try:
return _AUTO_PIPES_VAR.get()
except: # pylint: disable=bare-except
return None
[docs]class AutoPipes:
"""
Load Predefined pipeines.
"""
_PIPES_DEF = {}
_lock = threading.Lock()
[docs] def __init__(self):
raise EnvironmentError(
'AutoPipes is designed to be instantiated, please using the `AutoPipes.load_pipeline(pipeline_name)` etc.'
)
[docs] @staticmethod
def register(pipe_def):
@wraps(pipe_def)
def wrapper(*args, **kwargs):
return pipe_def(*args, **kwargs)
name = get_pipe_name()
if name is not None:
AutoPipes._PIPES_DEF[name] = wrapper
return wrapper
[docs] @staticmethod
def pipeline(name, *args, **kwargs) -> Optional['RuntimePipeline']:
with AutoPipes._lock:
if name in AutoPipes._PIPES_DEF:
return AutoPipes._PIPES_DEF[name](*args, **kwargs)
with set_pipe_name(name):
pipe_loader.PipelineLoader.load_pipeline(name)
if name in AutoPipes._PIPES_DEF:
return AutoPipes._PIPES_DEF[name](*args, **kwargs)
engine_log.error('Can not find the pipline %s', name)
return None
