kopia lustrzana https://github.com/simonw/datasette
102 wiersze
3.3 KiB
Python
102 wiersze
3.3 KiB
Python
import json
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from datasette.utils import (
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value_as_boolean,
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remove_infinites,
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CustomJSONEncoder,
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path_from_row_pks,
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)
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from datasette.utils.asgi import Response
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def convert_specific_columns_to_json(rows, columns, json_cols):
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json_cols = set(json_cols)
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if not json_cols.intersection(columns):
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return rows
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new_rows = []
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for row in rows:
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new_row = []
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for value, column in zip(row, columns):
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if column in json_cols:
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try:
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value = json.loads(value)
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except (TypeError, ValueError) as e:
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pass
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new_row.append(value)
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new_rows.append(new_row)
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return new_rows
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def json_renderer(args, data, view_name):
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"""Render a response as JSON"""
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status_code = 200
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# Handle the _json= parameter which may modify data["rows"]
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json_cols = []
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if "_json" in args:
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json_cols = args.getlist("_json")
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if json_cols and "rows" in data and "columns" in data:
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data["rows"] = convert_specific_columns_to_json(
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data["rows"], data["columns"], json_cols
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)
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# unless _json_infinity=1 requested, replace infinity with None
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if "rows" in data and not value_as_boolean(args.get("_json_infinity", "0")):
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data["rows"] = [remove_infinites(row) for row in data["rows"]]
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# Deal with the _shape option
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shape = args.get("_shape", "arrays")
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next_url = data.get("next_url")
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if shape == "arrayfirst":
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data = [row[0] for row in data["rows"]]
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elif shape in ("objects", "object", "array"):
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columns = data.get("columns")
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rows = data.get("rows")
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if rows and columns:
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data["rows"] = [dict(zip(columns, row)) for row in rows]
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if shape == "object":
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error = None
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if "primary_keys" not in data:
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error = "_shape=object is only available on tables"
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else:
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pks = data["primary_keys"]
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if not pks:
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error = (
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"_shape=object not available for tables with no primary keys"
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)
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else:
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object_rows = {}
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for row in data["rows"]:
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pk_string = path_from_row_pks(row, pks, not pks)
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object_rows[pk_string] = row
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data = object_rows
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if error:
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data = {"ok": False, "error": error}
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elif shape == "array":
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data = data["rows"]
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elif shape == "arrays":
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pass
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else:
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status_code = 400
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data = {
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"ok": False,
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"error": f"Invalid _shape: {shape}",
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"status": 400,
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"title": None,
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}
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# Handle _nl option for _shape=array
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nl = args.get("_nl", "")
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if nl and shape == "array":
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body = "\n".join(json.dumps(item, cls=CustomJSONEncoder) for item in data)
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content_type = "text/plain"
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else:
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body = json.dumps(data, cls=CustomJSONEncoder)
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content_type = "application/json; charset=utf-8"
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headers = {}
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if next_url:
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headers["link"] = f'<{next_url}>; rel="next"'
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return Response(
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body, status=status_code, headers=headers, content_type=content_type
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)
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