data_download.py
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# coding=utf-8
#author: 4N
#createtime: 2020/11/27
#email: nheweijun@sina.com
from ..models import *
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
class Api(ApiTemplate):
def process(self):
#获取参数
#返回结果
result={}
#设置编码
encoding = self.para.get("encoding")
if encoding:
gdal.SetConfigOption("SHAPE_ENCODING",encoding)
else:
gdal.SetConfigOption("SHAPE_ENCODING", "UTF-8")
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)
result["data"] = data
result["result"] = True
except Exception as e:
raise e
finally:
if ds:
ds.Destroy()
return result
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)
fid = layer.GetFIDColumn()
pg_layer: Layer = data_source.CreateLayer(table_name, layer.GetSpatialRef(), layer.GetGeomType())
schema = [sche for sche in layer.schema if not sche.name.__eq__(fid)]
pg_layer.CreateFields(schema)
layer.ResetReading()
for feature in layer:
pg_layer.CreateFeature(feature)
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__())
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()
for feature in layer:
feature.SetFID(feature.GetFID()+offset)
pg_layer.CreateFeature(feature)
# 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"
}
}
}
}
}
}