pipeline_client.py

# Copyright (c) 2020 PaddlePaddle Authors. 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.
# pylint: disable=doc-string-missing
import grpc
import numpy as np
from numpy import *
import logging
import functools
from .proto import pipeline_service_pb2
from .proto import pipeline_service_pb2_grpc

_LOGGER = logging.getLogger()


class PipelineClient(object):
    def __init__(self):
        self._channel = None

    def connect(self, endpoint):
        self._channel = grpc.insecure_channel(endpoint)
        self._stub = pipeline_service_pb2_grpc.PipelineServiceStub(
            self._channel)

    def _pack_request_package(self, feed_dict):
        req = pipeline_service_pb2.Request()
        for key, value in feed_dict.items():
            req.key.append(key)
            if isinstance(value, np.ndarray):
                req.value.append(value.__repr__())
            elif isinstance(value, str):
                req.value.append(value)
            elif isinstance(value, list):
                req.value.append(np.array(value).__repr__())
            else:
                raise TypeError("only str and np.ndarray type is supported: {}".
                                format(type(value)))
        return req

    def _unpack_response_package(self, resp, fetch):
        if resp.ecode != 0:
            return {"ecode": resp.ecode, "error_info": resp.error_info}
        fetch_map = {"ecode": resp.ecode}
        for idx, key in enumerate(resp.key):
            if fetch is not None and key not in fetch:
                continue
            data = resp.value[idx]
            try:
                data = eval(data)
            except Exception as e:
                pass
            fetch_map[key] = data
        return fetch_map

    def predict(self, feed_dict, fetch=None, asyn=False):
        if not isinstance(feed_dict, dict):
            raise TypeError(
                "feed must be dict type with format: {name: value}.")
        if fetch is not None and not isinstance(fetch, list):
            raise TypeError("fetch must be list type with format: [name].")
        req = self._pack_request_package(feed_dict)
        if not asyn:
            resp = self._stub.inference(req)
            return self._unpack_response_package(resp, fetch)
        else:
            call_future = self._stub.inference.future(req)
            return PipelinePredictFuture(
                call_future,
                functools.partial(
                    self._unpack_response_package, fetch=fetch))


class PipelinePredictFuture(object):
    def __init__(self, call_future, callback_func):
        self.call_future_ = call_future
        self.callback_func_ = callback_func

    def result(self):
        resp = self.call_future_.result()
        return self.callback_func_(resp)