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