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135 lines
4.4 KiB
135 lines
4.4 KiB
import abc
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from datetime import datetime
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from rest_framework.renderers import BaseRenderer
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from rest_framework.utils import encoders, json
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from common.utils import get_logger
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logger = get_logger(__file__)
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class BaseFileRenderer(BaseRenderer):
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# 渲染模版标识, 导入、导出、更新模版: ['import', 'update', 'export']
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template = 'export'
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serializer = None
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@staticmethod
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def _check_validation_data(data):
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detail_key = "detail"
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if detail_key in data:
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return False
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return True
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@staticmethod
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def _json_format_response(response_data):
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return json.dumps(response_data)
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def set_response_disposition(self, response):
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serializer = self.serializer
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if response and hasattr(serializer, 'Meta') and hasattr(serializer.Meta, "model"):
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filename_prefix = serializer.Meta.model.__name__.lower()
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else:
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filename_prefix = 'download'
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now = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
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filename = "{}_{}.{}".format(filename_prefix, now, self.format)
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disposition = 'attachment; filename="{}"'.format(filename)
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response['Content-Disposition'] = disposition
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def get_rendered_fields(self):
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fields = self.serializer.fields
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if self.template == 'import':
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return [v for k, v in fields.items() if not v.read_only and k != "org_id" and k != 'id']
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elif self.template == 'update':
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return [v for k, v in fields.items() if not v.read_only and k != "org_id"]
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else:
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return [v for k, v in fields.items() if not v.write_only and k != "org_id"]
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@staticmethod
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def get_column_titles(render_fields):
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return [
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'*{}'.format(field.label) if field.required else str(field.label)
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for field in render_fields
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]
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def process_data(self, data):
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results = data['results'] if 'results' in data else data
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if isinstance(results, dict):
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results = [results]
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if self.template == 'import':
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results = [results[0]] if results else results
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else:
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# 限制数据数量
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results = results[:10000]
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# 会将一些 UUID 字段转化为 string
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results = json.loads(json.dumps(results, cls=encoders.JSONEncoder))
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return results
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@staticmethod
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def generate_rows(data, render_fields):
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for item in data:
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row = []
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for field in render_fields:
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value = item.get(field.field_name)
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value = str(value) if value else ''
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row.append(value)
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yield row
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@abc.abstractmethod
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def initial_writer(self):
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raise NotImplementedError
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def write_column_titles(self, column_titles):
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self.write_row(column_titles)
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def write_rows(self, rows):
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for row in rows:
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self.write_row(row)
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@abc.abstractmethod
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def write_row(self, row):
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raise NotImplementedError
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@abc.abstractmethod
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def get_rendered_value(self):
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raise NotImplementedError
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def render(self, data, accepted_media_type=None, renderer_context=None):
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if data is None:
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return bytes()
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if not self._check_validation_data(data):
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return self._json_format_response(data)
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try:
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renderer_context = renderer_context or {}
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request = renderer_context['request']
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response = renderer_context['response']
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view = renderer_context['view']
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self.template = request.query_params.get('template', 'export')
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self.serializer = view.get_serializer()
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self.set_response_disposition(response)
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except Exception as e:
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logger.debug(e, exc_info=True)
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value = 'The resource not support export!'.encode('utf-8')
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return value
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try:
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rendered_fields = self.get_rendered_fields()
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column_titles = self.get_column_titles(rendered_fields)
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data = self.process_data(data)
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rows = self.generate_rows(data, rendered_fields)
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self.initial_writer()
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self.write_column_titles(column_titles)
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self.write_rows(rows)
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value = self.get_rendered_value()
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except Exception as e:
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logger.debug(e, exc_info=True)
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value = 'Render error! ({})'.format(self.media_type).encode('utf-8')
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return value
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return value
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