table_vacuate.py
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# author: 4N
# createtime: 2021/1/27
# email: nheweijun@sina.com
import datetime
import traceback
from app.models import Table, Database, DES,Task,db,TableVacuate
from sqlalchemy.engine import ResultProxy
from app.util.component.ApiTemplate import ApiTemplate
from app.util.component.PGUtil import PGUtil
from app.util.component.EntryDataVacuate import VacuateProcess,ThisTask,Process
from app.util.component.StructuredPrint import StructurePrint
from app.util.component.PGUtil import PGUtil
import multiprocessing
import uuid
import configure
from osgeo.ogr import DataSource,Layer
from .table_vacuate_ref import Api as RefApi
class Api(ApiTemplate):
api_name = "数据抽稀"
def process(self):
res = {}
res["data"] = {}
db_session = None
try:
table_guid = self.para.get("guid")
table: Table = Table.query.filter_by(guid=table_guid).one_or_none()
if not table:
raise Exception("数据不存在！")
pg_ds :DataSource= PGUtil.open_pg_data_source(0,DES.decode(table.relate_database.sqlalchemy_uri))
layer = pg_ds.GetLayerByName(table.name)
# 判断图层是否存在
if not layer:
raise Exception("图层不存在！")
# 判断用户权限
db_tuple = PGUtil.get_info_from_sqlachemy_uri(DES.decode(table.relate_database.sqlalchemy_uri))
if not PGUtil.check_table_privilege(table.name,"SELECT",db_tuple[0],pg_ds):
raise Exception("用户{}对表{}没有select权限！".format(db_tuple[0],table.name))
if pg_ds:
pg_ds.Destroy()
if Task.query.filter_by(table_guid=table_guid,state=0).one_or_none():
res["result"] = False
res["msg"] = "数据精化中！"
return res
if table.table_type==0:
res["result"] = False
res["msg"] = "非空间表！"
return res
# if table.is_vacuate==1:
# res["state"] = -1
# res["message"] = "已精化！"
# return res
# 初始化task
task_guid = uuid.uuid1().__str__()
vacuate_process = multiprocessing.Process(target=self.task,args=(table,task_guid))
vacuate_process.start()
ref_api = RefApi()
ref_api.para["guid"] = table_guid
ref_grids = ref_api.process()["data"]
task = Task(guid=task_guid,
name="{}精化".format(table.name),
table_guid=table_guid,
create_time=datetime.datetime.now(),
state=0,
task_type=2,
creator=self.para.get("creator"),
file_name=None,
database_guid=table.database_guid,
process="精化中",
parameter=",".join([str(x) for x in ref_grids]))
db.session.add(task)
db.session.commit()
res["msg"] = "图层抽稀已提交！"
res["data"] = task_guid
res["result"] = True
except Exception as e:
raise e
finally:
if db_session:
db_session.close()
return res
def task(self,table,task_guid):
sys_session = None
pg_session = None
pg_ds = None
vacuate_process = None
try:
sys_session = PGUtil.get_db_session(configure.SQLALCHEMY_DATABASE_URI)
sys_session.query(Table).filter_by(guid=table.guid).update(
{"is_vacuate": 2, "update_time": datetime.datetime.now()})
sys_session.commit()
database = sys_session.query(Database).filter_by(guid=table.database_guid).one_or_none()
pg_session = PGUtil.get_db_session(DES.decode(database.sqlalchemy_uri))
pg_ds :DataSource= PGUtil.open_pg_data_source(0,DES.decode(database.sqlalchemy_uri))
#删除原有数据
tvs = sys_session.query(TableVacuate).filter_by(table_guid=table.guid).all()
for tv in tvs :
sys_session.delete(tv)
# try:
# pg_ds.DeleteLayer(tv.name)
# except Exception as e :
# StructurePrint.print("抽稀图层不存在！","warn")
# 创建抽稀过程
options = ["OVERWRITE=yes", "GEOMETRY_NAME={}".format(PGUtil.get_geo_column(table.name,pg_session)),
"PRECISION=NO"]
layer = pg_ds.GetLayerByName(table.name)
vacuate_process:VacuateProcess = VacuateProcess(layer, table.name, options,database.sqlalchemy_uri)
for feature in layer:
geo = feature.GetGeometryRef()
#插入抽稀图层
if geo is not None:
vacuate_process.vacuate(geo)
#新增
for l in range(vacuate_process.max_level):
lev = vacuate_process.t_grid_size.index(vacuate_process.this_gridsize[l])
table_vacuate = TableVacuate(guid=uuid.uuid1().__str__(),
table_guid=table.guid,
level=lev,
name=vacuate_process.vacuate_layers[l].GetName(),
pixel_distance=vacuate_process.this_gridsize[l])
sys_session.add(table_vacuate)
sys_session.query(Task).filter_by(guid=task_guid).update({"state":1,"update_time":datetime.datetime.now(),
"process": "精化完成"})
sys_session.query(Table).filter_by(guid=table.guid).update(
{"is_vacuate": 1, "update_time": datetime.datetime.now()})
sys_session.commit()
except Exception as e:
try:
sys_session.query(Task).filter_by(guid=task_guid).update({"state": -1,"update_time":datetime.datetime.now(),
"process": "精化失败"})
sys_session.query(Table).filter_by(guid=table.guid).update(
{"is_vacuate": 0, "update_time": datetime.datetime.now()})
message = "{} {}".format(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'), e.__str__())
task_process_guid = uuid.uuid1().__str__()
task_process = Process(guid=task_process_guid, message=message, time=datetime.datetime.now(),
task_guid=task_guid)
sys_session.add(task_process)
sys_session.commit()
if vacuate_process:
vacuate_process.rollback()
print(traceback.format_exc())
except Exception as ee:
print(traceback.format_exc())
finally:
if vacuate_process:
vacuate_process.end()
if sys_session:
sys_session.close()
if pg_session:
pg_session.close()
if pg_ds:
pg_ds.Destroy()
api_doc = {
"tags": ["管理接口"],
"parameters": [
{"name": "guid",
"in": "formData",
"type": "string",
"description": "表guid", "required": "true"},
],
"responses": {
200: {
"schema": {
"properties": {
}
}
}
}
}