data_download.py
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# coding=utf-8
#author: 4N
#createtime: 2020/11/27
#email: nheweijun@sina.com
from app.models import *
import traceback
from osgeo.ogr import DataSource,Layer,FeatureDefn,FieldDefn
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
class Api(ApiTemplate):
api_name = "下载数据"
def process(self):
#获取参数
#返回结果
res={}
#设置编码
encoding = self.para.get("encoding")
if encoding:
gdal.SetConfigOption("SHAPE_ENCODING",encoding)
else:
gdal.SetConfigOption("SHAPE_ENCODING", "GBK")
ds:DataSource = None
try:
table_names = self.para.get("table_name").split(",")
database_guid = self.para.get("database_guid")
database = Database.query.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 = self.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(table_names, ds,database_guid)
res["data"] = data
res["result"] = True
except Exception as e:
print(traceback.format_exc())
res["msg"]= e.__str__()
res["result"]=False
finally:
if ds:
ds.Destroy()
return res
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))
data_source.CopyLayer(layer, table_name)
data_source.Destroy()
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")
def download_gdb(self,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__)))
gdb_path = os.path.join(parent, "file_tmp", uuid_+".gdb")
gdb_ds: DataSource = gdb_driver.CreateDataSource(gdb_path)
for table_name in table_names:
layer: Layer = ds.GetLayerByName(table_name)
table = Table.query.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 = Columns.query.filter_by(table_guid=table.guid,name=field_defn.GetName()).one_or_none().alias
field_defn.SetAlternativeName(field_alias)
table_alias= table.alias
# if is_chinese(table_name):
# if not table_alias:
# table_alias = table_name
# table_name = "table{}".format(table_name.__hash__())
gdb_ds.CopyLayer(layer, table_name,["LAYER_ALIAS={}".format(table_alias)])
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_+".gdb" + ".zip")})
return data
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"
}
],
"responses":{
200:{
"schema":{
"properties":{
"content":{
"type": "string",
"description": "The name of the user"
}
}
}
}
}
}