rov-server/video_recall.py

import time

from datetime import date, timedelta
from log import Log
from db_helper import RedisHelper
from config import set_config
from utils import FilterVideos, get_videos_remain_view_count

log_ = Log()
config_ = set_config()


class PoolRecall(object):
    """召回"""
    def __init__(self, app_type, mid, uid):
        """
        初始化
        :param app_type: 产品标识 type-int
        :param mid: mid type-string
        :param uid: uid type-string
        """
        self.app_type = app_type
        self.mid = mid
        self.uid = uid
        self.redis_helper = RedisHelper()

    def rov_pool_recall(self, size=10):
        """从ROV召回池中获取视频"""
        log_.info('====== rov pool recall')
        # 获取相关redis key, 用户上一次在rov召回池对应的位置
        rov_pool_key, last_rov_recall_key, idx = self.get_video_last_idx()
        if not rov_pool_key:
            log_.info('ROV召回池中无视频')
            return []
        rov_pool_recall_result = []
        # 每次获取的视频数
        get_size = size * 2
        # 记录获取频次
        freq = 0
        while len(rov_pool_recall_result) < size:
            freq += 1
            if freq > config_.MAX_FREQ_FROM_ROV_POOL:
                break
            # 获取数据
            st_get = time.time()
            data = self.redis_helper.get_data_zset_with_index(key_name=rov_pool_key,
                                                              start=idx, end=idx + get_size - 1,
                                                              with_scores=True)
            et_get = time.time()
            log_.info('get data from rov pool redis: freq = {}, data = {}, execute time = {}ms'.format(
                freq, data, (et_get - st_get) * 1000))
            if not data:
                log_.info('ROV召回池中的视频已取完')
                break
            # 获取视频id,并转换类型为int,并存储为key-value{videoId: score}
            video_ids = []
            video_score = {}
            for value in data:
                video_ids.append(eval(value[0]))
                video_score[eval(value[0])] = value[1]
            # 过滤
            filter_ = FilterVideos(app_type=self.app_type, mid=self.mid, uid=self.uid, video_ids=video_ids)
            filtered_result = filter_.filter_videos()
            if filtered_result:
                temp_result = [{'videoId': item, 'rovScore': video_score[item]} for item in filtered_result]
                rov_pool_recall_result.extend(temp_result)
            else:
                # 将此次获取的末位视频id同步刷新到Redis中，方便下次快速定位到召回位置，过期时间为1天
                self.redis_helper.set_data_to_redis(key_name=last_rov_recall_key, value=data[-1])
            idx += get_size
        return rov_pool_recall_result[:size]

    def flow_pool_recall(self, size=10):
        """从流量池中获取视频"""
        log_.info('====== flow pool recall')
        flow_pool_key = config_.FLOW_POOL_KEY_NAME
        flow_pool_recall_result = []
        flow_pool_recall_videos = []
        # 每次获取的视频数
        get_size = size * 3
        # 记录获取频次
        freq = 0
        idx = 0
        while len(flow_pool_recall_result) < size:
            # 获取数据
            st_get = time.time()
            data = self.redis_helper.get_data_zset_with_index(key_name=flow_pool_key,
                                                              start=idx, end=idx + get_size - 1,
                                                              with_scores=True)
            et_get = time.time()
            log_.info('get data from flow pool redis: freq = {}, data = {}, execute time = {}ms'.format(
                freq, data, (et_get - st_get) * 1000))
            if not data:
                log_.info('流量池中的视频已取完')
                break
            # 将video_id 与 flow_pool, score做mapping整理
            video_ids = []
            video_mapping = {}
            video_score = {}
            for value in data:
                video_id, flow_pool = value[0].split('-')
                video_id = eval(video_id)
                if video_id not in video_ids:
                    video_ids.append(video_id)
                    video_score[video_id] = value[1]
                if video_id not in video_mapping:
                    video_mapping[video_id] = [flow_pool]
                else:
                    video_mapping[video_id].append(flow_pool)
            # 过滤
            filter_ = FilterVideos(app_type=self.app_type, mid=self.mid, uid=self.uid, video_ids=video_ids)
            filtered_result = filter_.filter_videos()
            # 检查可分发数
            if filtered_result:
                st_check = time.time()
                check_result = self.check_video_counts(video_ids=filtered_result, flow_pool_mapping=video_mapping)
                for item in check_result:
                    if item[0] not in flow_pool_recall_videos:
                        # 取其中一个 flow_pool 作为召回结果
                        flow_pool_recall_result.append(
                            {'videoId': item[0], 'flowPool': item[1], 'rovScore': video_score[item[0]]}
                        )
                        flow_pool_recall_videos.append(item[0])
                et_check = time.time()
                log_.info('check result: result = {}, execute time = {}ms'.format(
                    check_result, (et_check - st_check) * 1000))
            idx += get_size

        return flow_pool_recall_result[:size]

    def check_video_counts(self, video_ids, flow_pool_mapping):
        """
        检查视频剩余可分发数
        :param video_ids: 视频id type-list
        :param flow_pool_mapping: 视频id-流量池标记mapping, type-dict
        :return:
        """
        videos = []
        for video_id in video_ids:
            for flow_pool in flow_pool_mapping[video_id]:
                videos.append({'videoId': video_id, 'flowPool': flow_pool})
        check_result = get_videos_remain_view_count(app_type=self.app_type, videos=videos)
        if not check_result:
            return None
        return check_result

    def get_pool_redis_key(self, pool_type):
        """
        拼接key
        :param pool_type: type-string {'rov': rov召回池, 'flow': 流量池}
        :return: key_name
        """
        if pool_type == 'rov':
            # 判断热度列表是否更新，未更新则使用前一天的热度列表
            key_name = config_.RECALL_KEY_NAME_PREFIX + time.strftime('%Y%m%d')
            if self.redis_helper.key_exists(key_name):
                redis_date = date.today().strftime('%Y%m%d')
            else:
                redis_date = (date.today() - timedelta(days=1)).strftime('%Y%m%d')
                key_name = config_.RECALL_KEY_NAME_PREFIX + redis_date
                if not self.redis_helper.key_exists(key_name):
                    return None, None
            return key_name, redis_date

        elif pool_type == 'flow':
            return config_.FLOW_POOL_KEY_NAME

        else:
            log_.error('pool type error')
            return None, None

    def get_video_last_idx(self):
        """获取用户上一次在rov召回池对应的位置"""
        rov_pool_key, redis_date = self.get_pool_redis_key('rov')
        if not rov_pool_key:
            return None, None, None
        last_rov_recall_key = config_.LAST_VIDEO_FROM_ROV_POOL_PREFIX + '{}.{}'.format(self.mid, redis_date)
        value = self.redis_helper.get_data_from_redis(last_rov_recall_key)
        if value:
            idx = self.redis_helper.get_index_with_data(rov_pool_key, value)
            if not idx:
                idx = 0
            else:
                idx += 1
        else:
            idx = 0
        return rov_pool_key, last_rov_recall_key, idx