data_download_task.py
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# coding=utf-8
#author: 4N
#createtime: 2020/11/27
#email: nheweijun@sina.com
from ..models import *
import traceback
from .util.SchemaAdapter import SchemaAdapter
from osgeo.ogr import DataSource,Layer,FeatureDefn,FieldDefn,Feature
from osgeo import gdal,ogr
import os
import uuid
import configure
from app.util.component.ApiTemplate import ApiTemplate
from app.util.component.PGUtil import PGUtil
from app.util.component.ZipUtil import ZipUtil
from app.util.component.StructurePrint import StructurePrint
import multiprocessing
import datetime
from app.util.component.TaskController import TaskController
from app.util.component.TaskWriter import TaskWriter
class Api(ApiTemplate):
api_name = "数据下载"
def process(self):
res = {}
#获取参数
try:
task_guid = uuid.uuid1().__str__()
download_process = multiprocessing.Process(target=self.download, args=(task_guid,self.para))
download_process.start()
task = Task(guid=task_guid,
name="下载 | {}".format(self.para.get("table_name")),
create_time=datetime.datetime.now(),
state=0,
task_type=4,
creator=self.para.get("creator"),
file_name=None,
process="数据下载中",
database_guid=self.para.get("database_guid"),
task_pid=download_process.pid)
db.session.add(task)
db.session.commit()
res["data"] = "下载任务已提交!"
# 提示信息
res["msg"] = "下载格式为shp时，属性名长度超过10个字符将截取为10个字符，binary类型的属性将改成integer类型且值为0。"
res["msg"] = ""
res["result"] = True
except Exception as e:
raise e
return res
def download(self,task_guid,para):
ds: DataSource = None
task_writer = None
# 设置编码
# encoding = para.get("encoding")
# if encoding:
# gdal.SetConfigOption("SHAPE_ENCODING", encoding)
# else:
# gdal.SetConfigOption("SHAPE_ENCODING", "GBK")
try:
#任务控制,等待执行
TaskController.wait(task_guid)
task_writer = TaskWriter(task_guid)
task_writer.update_task({"state":2,"update_time":datetime.datetime.now(),"process" : "下载中"})
task_writer.update_process("开始下载...")
table_names = para.get("table_name").split(",")
database_guid = para.get("database_guid")
database = task_writer.session.query(Database).filter_by(guid=database_guid).one_or_none()
if not database:
raise Exception("数据库不存在！")
ds: DataSource = PGUtil.open_pg_data_source(0, DES.decode(database.sqlalchemy_uri))
download_type = para.get("download_type")
data = None
if download_type.__eq__("shp"):
data = self.download_shp(table_names, ds)
if download_type.__eq__("gdb"):
data = self.download_gdb(task_writer.session,table_names, ds, database_guid)
task_writer.update_task({"state":1,"update_time":datetime.datetime.now(),"process" : "下载完成","parameter":data[0]["download_url"]})
task_writer.update_process("下载完成！")
except Exception as e:
try:
task_writer.update_task({"state": -1,"update_time":datetime.datetime.now(),"process": "下载失败"})
task_writer.update_process( e.__str__())
task_writer.update_process("任务中止！")
except Exception as ee:
StructurePrint().print(ee.__str__())
raise e
finally:
try:
if ds:
ds.Destroy()
task_writer.close()
except Exception as e:
StructurePrint().print(e.__str__())
def download_shp(self,table_names,ds):
data = []
for table_name in table_names:
url = self.download_one(ds, table_name)
data.append({"name": table_name, "download_url": url})
return data
def download_one(self,ds,table_name):
layer: Layer = ds.GetLayerByName(table_name)
driver = ogr.GetDriverByName("ESRI Shapefile")
uuid_ = uuid.uuid1().__str__()
parent = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
dirpath = os.path.join(parent, "file_tmp", uuid_)
os.makedirs(dirpath)
data_source: DataSource = driver.CreateDataSource(dirpath + "/{}.shp".format(table_name))
fid = layer.GetFIDColumn()
pg_layer: Layer = data_source.CreateLayer(table_name, layer.GetSpatialRef(), layer.GetGeomType(),["ENCODING=GBK"])
schema = [sche for sche in layer.schema if not sche.name.__eq__(fid)]
# 忽略binary字段
SchemaAdapter.neglect_binary(schema)
pg_layer.CreateFields(schema)
layer.ResetReading()
count = 0
for feature in layer:
pg_layer.CreateFeature(feature)
count += 1
if count % 10000 == 0:
StructurePrint().print("{}图层已下载{}个对象".format(table_name, count))
data_source.Destroy()
#增加cpg文件
with open(dirpath + "/{}.cpg".format(table_name),"w") as f:
f.write("GBK")
zip_uuid_ = uuid.uuid1().__str__()
zippath = os.path.join(parent, "file_tmp", zip_uuid_)
os.makedirs(zippath)
# ZipUtil.create_zip(os.path.join(parent, "file_tmp", table_name+"_"+uuid_) + ".zip", [dirpath])
#return "http://" + configure.deploy_ip_host + "/API/IO/Download/{}".format(table_name + "_" + uuid_ + ".zip")
files = []
for f in os.listdir(dirpath):
files.append(os.path.join(dirpath, f))
ZipUtil.create_zip(os.path.join(zippath, table_name) + ".zip", files)
return "http://" + configure.deploy_ip_host + "/API/IO/Download/{}/{}".format(zip_uuid_,table_name+ ".zip")
def download_gdb(self,sys_session,table_names,ds,database_guid):
ogr.RegisterAll()
data = []
gdal.UseExceptions()
gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES")
# 创建一个gdb datasource
gdb_driver = ogr.GetDriverByName('FileGDB')
uuid_ = uuid.uuid1().__str__()
parent = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
dirpath = os.path.join(parent, "file_tmp", uuid_)
os.makedirs(dirpath)
gdb_path = os.path.join(parent, "file_tmp", uuid_, table_names[0]+".gdb")
gdb_ds: DataSource = gdb_driver.CreateDataSource(gdb_path)
for table_name in table_names:
layer: Layer = ds.GetLayerByName(table_name)
table = sys_session.query(Table).filter_by(name=table_name, database_guid=database_guid).one_or_none()
feature_defn: FeatureDefn = layer.GetLayerDefn()
for i in range(feature_defn.GetFieldCount()):
field_defn:FieldDefn = feature_defn.GetFieldDefn(i)
field_alias = sys_session.query(Columns).filter_by(table_guid=table.guid,name=field_defn.GetName()).one_or_none().alias
field_defn.SetAlternativeName(field_alias)
table_alias= table.alias if table.alias is not None else table_name
fid = layer.GetFIDColumn()
pg_layer: Layer = gdb_ds.CreateLayer(table_name, layer.GetSpatialRef(), layer.GetGeomType(),["LAYER_ALIAS={}".format(table_alias)])
schema = [sche for sche in layer.schema if not sche.name.__eq__(fid)]
# schema = layer.schema
pg_layer.CreateFields(schema)
# gdb 不支持fid=0的要素，所以识别到后要+1
offset = 0
f1:Feature = layer.GetNextFeature()
if f1:
if f1.GetFID().__eq__(0):
offset = 1
layer.ResetReading()
count = 0
for feature in layer:
feature.SetFID(feature.GetFID()+offset)
pg_layer.CreateFeature(feature)
count += 1
if count % 10000 == 0:
StructurePrint().print("{}图层已下载{}个对象".format(table_name, count))
gdb_ds.Destroy()
ZipUtil.create_zip(gdb_path + ".zip", [gdb_path])
data.append({"name": ",".join(table_names), "download_url": "http://" + configure.deploy_ip_host + "/API/IO/Download/{}/{}".format(uuid_,table_names[0]+".gdb" + ".zip")})
return data
def msg(self):
pass
api_doc={
"tags":["IO接口"],
"description":"下载数据",
"parameters":[
{"name": "table_name",
"in": "formData",
"type":"string","description":"支持多图层下载，以逗号相隔","required":"true"},
# {"name": "encoding",
# "in": "formData",
# "type": "string",
# "enum":["GBK","UTF-8"]},
{"name": "download_type",
"in": "formData",
"type": "string",
"enum": ["shp", "gdb"],"required":"true"
},
{"name": "database_guid",
"in": "formData",
"type": "string","required":"true"
},
{"name": "creator",
"in": "formData",
"type": "string"
}
],
"responses":{
200:{
"schema":{
"properties":{
"content":{
"type": "string",
"description": "The name of the user"
}
}
}
}
}
}