kopia lustrzana https://github.com/simonw/datasette
764 wiersze
30 KiB
Python
764 wiersze
30 KiB
Python
import sqlite3
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import urllib
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import jinja2
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from sanic.exceptions import NotFound
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from sanic.request import RequestParameters
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from datasette.utils import (
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Filters,
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compound_keys_after_sql,
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escape_sqlite,
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filters_should_redirect,
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is_url,
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path_from_row_pks,
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path_with_added_args,
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to_css_class,
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urlsafe_components
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)
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from .base import BaseView, DatasetteError, ureg
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class RowTableShared(BaseView):
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def sortable_columns_for_table(self, name, table, use_rowid):
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table_metadata = self.table_metadata(name, table)
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if "sortable_columns" in table_metadata:
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sortable_columns = set(table_metadata["sortable_columns"])
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else:
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table_info = self.ds.inspect()[name]["tables"].get(table) or {}
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sortable_columns = set(table_info.get("columns", []))
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if use_rowid:
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sortable_columns.add("rowid")
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return sortable_columns
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async def display_columns_and_rows(
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self,
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database,
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table,
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description,
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rows,
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link_column=False,
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expand_foreign_keys=True,
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):
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"Returns columns, rows for specified table - including fancy foreign key treatment"
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table_metadata = self.table_metadata(database, table)
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info = self.ds.inspect()[database]
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sortable_columns = self.sortable_columns_for_table(database, table, True)
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columns = [
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{"name": r[0], "sortable": r[0] in sortable_columns} for r in description
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]
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tables = info["tables"]
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table_info = tables.get(table) or {}
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pks = table_info.get("primary_keys") or []
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# Prefetch foreign key resolutions for later expansion:
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fks = {}
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labeled_fks = {}
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if table_info and expand_foreign_keys:
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foreign_keys = table_info["foreign_keys"]["outgoing"]
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for fk in foreign_keys:
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label_column = (
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# First look in metadata.json definition for this foreign key table:
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self.table_metadata(database, fk["other_table"]).get("label_column")
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# Fall back to label_column from .inspect() detection:
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or tables.get(fk["other_table"], {}).get("label_column")
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)
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if not label_column:
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# No label for this FK
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fks[fk["column"]] = fk["other_table"]
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continue
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ids_to_lookup = set([row[fk["column"]] for row in rows])
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sql = 'select "{other_column}", "{label_column}" from {other_table} where "{other_column}" in ({placeholders})'.format(
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other_column=fk["other_column"],
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label_column=label_column,
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other_table=escape_sqlite(fk["other_table"]),
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placeholders=", ".join(["?"] * len(ids_to_lookup)),
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)
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try:
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results = await self.execute(
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database, sql, list(set(ids_to_lookup))
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)
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except sqlite3.OperationalError:
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# Probably hit the timelimit
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pass
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else:
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for id, value in results:
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labeled_fks[(fk["column"], id)] = (fk["other_table"], value)
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cell_rows = []
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for row in rows:
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cells = []
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# Unless we are a view, the first column is a link - either to the rowid
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# or to the simple or compound primary key
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if link_column:
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cells.append(
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{
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"column": pks[0] if len(pks) == 1 else "Link",
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"value": jinja2.Markup(
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'<a href="/{database}/{table}/{flat_pks_quoted}">{flat_pks}</a>'.format(
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database=database,
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table=urllib.parse.quote_plus(table),
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flat_pks=str(
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jinja2.escape(
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path_from_row_pks(row, pks, not pks, False)
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)
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),
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flat_pks_quoted=path_from_row_pks(row, pks, not pks),
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)
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),
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}
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)
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for value, column_dict in zip(row, columns):
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column = column_dict["name"]
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if link_column and len(pks) == 1 and column == pks[0]:
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# If there's a simple primary key, don't repeat the value as it's
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# already shown in the link column.
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continue
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if (column, value) in labeled_fks:
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other_table, label = labeled_fks[(column, value)]
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display_value = jinja2.Markup(
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'<a href="/{database}/{table}/{link_id}">{label}</a> <em>{id}</em>'.format(
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database=database,
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table=urllib.parse.quote_plus(other_table),
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link_id=urllib.parse.quote_plus(str(value)),
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id=str(jinja2.escape(value)),
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label=str(jinja2.escape(label)),
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)
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)
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elif column in fks:
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display_value = jinja2.Markup(
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'<a href="/{database}/{table}/{link_id}">{id}</a>'.format(
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database=database,
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table=urllib.parse.quote_plus(fks[column]),
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link_id=urllib.parse.quote_plus(str(value)),
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id=str(jinja2.escape(value)),
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)
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)
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elif value is None:
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display_value = jinja2.Markup(" ")
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elif is_url(str(value).strip()):
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display_value = jinja2.Markup(
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'<a href="{url}">{url}</a>'.format(
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url=jinja2.escape(value.strip())
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)
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)
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elif column in table_metadata.get("units", {}) and value != "":
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# Interpret units using pint
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value = value * ureg(table_metadata["units"][column])
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# Pint uses floating point which sometimes introduces errors in the compact
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# representation, which we have to round off to avoid ugliness. In the vast
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# majority of cases this rounding will be inconsequential. I hope.
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value = round(value.to_compact(), 6)
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display_value = jinja2.Markup(
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"{:~P}".format(value).replace(" ", " ")
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)
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else:
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display_value = str(value)
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cells.append({"column": column, "value": display_value})
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cell_rows.append(cells)
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if link_column:
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# Add the link column header.
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# If it's a simple primary key, we have to remove and re-add that column name at
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# the beginning of the header row.
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if len(pks) == 1:
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columns = [col for col in columns if col["name"] != pks[0]]
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columns = [
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{"name": pks[0] if len(pks) == 1 else "Link", "sortable": len(pks) == 1}
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] + columns
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return columns, cell_rows
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class TableView(RowTableShared):
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async def data(self, request, name, hash, table):
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table = urllib.parse.unquote_plus(table)
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canned_query = self.ds.get_canned_query(name, table)
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if canned_query is not None:
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return await self.custom_sql(
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request,
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name,
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hash,
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canned_query["sql"],
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editable=False,
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canned_query=table,
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)
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is_view = bool(
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list(
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await self.execute(
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name,
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"SELECT count(*) from sqlite_master WHERE type = 'view' and name=:n",
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{"n": table},
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)
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)[
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0
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][
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0
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]
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)
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view_definition = None
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table_definition = None
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if is_view:
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view_definition = list(
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await self.execute(
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name,
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'select sql from sqlite_master where name = :n and type="view"',
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{"n": table},
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)
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)[
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0
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][
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0
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]
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else:
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table_definition_rows = list(
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await self.execute(
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name,
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'select sql from sqlite_master where name = :n and type="table"',
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{"n": table},
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)
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)
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if not table_definition_rows:
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raise NotFound("Table not found: {}".format(table))
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table_definition = table_definition_rows[0][0]
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info = self.ds.inspect()
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table_info = info[name]["tables"].get(table) or {}
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pks = table_info.get("primary_keys") or []
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use_rowid = not pks and not is_view
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if use_rowid:
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select = "rowid, *"
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order_by = "rowid"
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order_by_pks = "rowid"
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else:
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select = "*"
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order_by_pks = ", ".join([escape_sqlite(pk) for pk in pks])
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order_by = order_by_pks
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if is_view:
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order_by = ""
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# We roll our own query_string decoder because by default Sanic
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# drops anything with an empty value e.g. ?name__exact=
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args = RequestParameters(
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urllib.parse.parse_qs(request.query_string, keep_blank_values=True)
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)
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# Special args start with _ and do not contain a __
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# That's so if there is a column that starts with _
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# it can still be queried using ?_col__exact=blah
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special_args = {}
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special_args_lists = {}
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other_args = {}
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for key, value in args.items():
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if key.startswith("_") and "__" not in key:
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special_args[key] = value[0]
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special_args_lists[key] = value
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else:
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other_args[key] = value[0]
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# Handle ?_filter_column and redirect, if present
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redirect_params = filters_should_redirect(special_args)
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if redirect_params:
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return self.redirect(
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request,
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path_with_added_args(request, redirect_params),
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forward_querystring=False,
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)
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# Spot ?_sort_by_desc and redirect to _sort_desc=(_sort)
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if "_sort_by_desc" in special_args:
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return self.redirect(
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request,
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path_with_added_args(
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request,
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{
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"_sort_desc": special_args.get("_sort"),
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"_sort_by_desc": None,
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"_sort": None,
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},
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),
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forward_querystring=False,
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)
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table_metadata = self.table_metadata(name, table)
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units = table_metadata.get("units", {})
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filters = Filters(sorted(other_args.items()), units, ureg)
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where_clauses, params = filters.build_where_clauses()
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# _search support:
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fts_table = info[name]["tables"].get(table, {}).get("fts_table")
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search_args = dict(
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pair for pair in special_args.items() if pair[0].startswith("_search")
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)
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search_descriptions = []
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search = ""
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if fts_table and search_args:
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if "_search" in search_args:
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# Simple ?_search=xxx
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search = search_args["_search"]
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where_clauses.append(
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"rowid in (select rowid from [{fts_table}] where [{fts_table}] match :search)".format(
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fts_table=fts_table
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)
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)
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search_descriptions.append('search matches "{}"'.format(search))
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params["search"] = search
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else:
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# More complex: search against specific columns
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valid_columns = set(info[name]["tables"][fts_table]["columns"])
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for i, (key, search_text) in enumerate(search_args.items()):
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search_col = key.split("_search_", 1)[1]
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if search_col not in valid_columns:
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raise DatasetteError("Cannot search by that column", status=400)
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where_clauses.append(
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"rowid in (select rowid from [{fts_table}] where [{search_col}] match :search_{i})".format(
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fts_table=fts_table, search_col=search_col, i=i
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)
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)
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search_descriptions.append(
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'search column "{}" matches "{}"'.format(
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search_col, search_text
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)
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)
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params["search_{}".format(i)] = search_text
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table_rows_count = None
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sortable_columns = set()
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if not is_view:
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table_rows_count = table_info["count"]
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sortable_columns = self.sortable_columns_for_table(name, table, use_rowid)
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# Allow for custom sort order
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sort = special_args.get("_sort")
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if sort:
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if sort not in sortable_columns:
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raise DatasetteError("Cannot sort table by {}".format(sort))
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order_by = escape_sqlite(sort)
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sort_desc = special_args.get("_sort_desc")
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if sort_desc:
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if sort_desc not in sortable_columns:
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raise DatasetteError("Cannot sort table by {}".format(sort_desc))
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if sort:
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raise DatasetteError("Cannot use _sort and _sort_desc at the same time")
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order_by = "{} desc".format(escape_sqlite(sort_desc))
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from_sql = "from {table_name} {where}".format(
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table_name=escape_sqlite(table),
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where=(
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"where {} ".format(" and ".join(where_clauses))
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) if where_clauses else "",
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)
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count_sql = "select count(*) {}".format(from_sql)
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_next = special_args.get("_next")
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offset = ""
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if _next:
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if is_view:
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# _next is an offset
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offset = " offset {}".format(int(_next))
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else:
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components = urlsafe_components(_next)
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# If a sort order is applied, the first of these is the sort value
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if sort or sort_desc:
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sort_value = components[0]
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# Special case for if non-urlencoded first token was $null
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if _next.split(",")[0] == "$null":
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sort_value = None
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components = components[1:]
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# Figure out the SQL for next-based-on-primary-key first
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next_by_pk_clauses = []
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if use_rowid:
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next_by_pk_clauses.append("rowid > :p{}".format(len(params)))
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params["p{}".format(len(params))] = components[0]
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else:
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# Apply the tie-breaker based on primary keys
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if len(components) == len(pks):
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param_len = len(params)
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next_by_pk_clauses.append(
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compound_keys_after_sql(pks, param_len)
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)
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for i, pk_value in enumerate(components):
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params["p{}".format(param_len + i)] = pk_value
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# Now add the sort SQL, which may incorporate next_by_pk_clauses
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if sort or sort_desc:
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if sort_value is None:
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if sort_desc:
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# Just items where column is null ordered by pk
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where_clauses.append(
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"({column} is null and {next_clauses})".format(
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column=escape_sqlite(sort_desc),
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next_clauses=" and ".join(next_by_pk_clauses),
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)
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)
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else:
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where_clauses.append(
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"({column} is not null or ({column} is null and {next_clauses}))".format(
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column=escape_sqlite(sort),
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next_clauses=" and ".join(next_by_pk_clauses),
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)
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)
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else:
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where_clauses.append(
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"({column} {op} :p{p}{extra_desc_only} or ({column} = :p{p} and {next_clauses}))".format(
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column=escape_sqlite(sort or sort_desc),
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op=">" if sort else "<",
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p=len(params),
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extra_desc_only="" if sort else " or {column2} is null".format(
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column2=escape_sqlite(sort or sort_desc)
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),
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next_clauses=" and ".join(next_by_pk_clauses),
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)
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)
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params["p{}".format(len(params))] = sort_value
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order_by = "{}, {}".format(order_by, order_by_pks)
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else:
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where_clauses.extend(next_by_pk_clauses)
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where_clause = ""
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if where_clauses:
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where_clause = "where {} ".format(" and ".join(where_clauses))
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|
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if order_by:
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order_by = "order by {} ".format(order_by)
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|
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# _group_count=col1&_group_count=col2
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group_count = special_args_lists.get("_group_count") or []
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if group_count:
|
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sql = 'select {group_cols}, count(*) as "count" from {table_name} {where} group by {group_cols} order by "count" desc limit 100'.format(
|
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group_cols=", ".join(
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'"{}"'.format(group_count_col) for group_count_col in group_count
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),
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table_name=escape_sqlite(table),
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where=where_clause,
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)
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return await self.custom_sql(request, name, hash, sql, editable=True)
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|
|
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extra_args = {}
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# Handle ?_page_size=500
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page_size = request.raw_args.get("_size")
|
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if page_size:
|
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if page_size == "max":
|
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page_size = self.max_returned_rows
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try:
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page_size = int(page_size)
|
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if page_size < 0:
|
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raise ValueError
|
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except ValueError:
|
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raise DatasetteError("_size must be a positive integer", status=400)
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|
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if page_size > self.max_returned_rows:
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raise DatasetteError(
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"_size must be <= {}".format(self.max_returned_rows), status=400
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)
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extra_args["page_size"] = page_size
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else:
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page_size = self.page_size
|
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|
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sql = "select {select} from {table_name} {where}{order_by}limit {limit}{offset}".format(
|
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select=select,
|
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table_name=escape_sqlite(table),
|
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where=where_clause,
|
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order_by=order_by,
|
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limit=page_size + 1,
|
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offset=offset,
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)
|
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|
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if request.raw_args.get("_timelimit"):
|
|
extra_args["custom_time_limit"] = int(request.raw_args["_timelimit"])
|
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|
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rows, truncated, description = await self.execute(
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name, sql, params, truncate=True, **extra_args
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)
|
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|
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# facets support
|
|
try:
|
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facets = request.args["_facet"]
|
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except KeyError:
|
|
facets = table_metadata.get("facets", [])
|
|
facet_results = {}
|
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for column in facets:
|
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facet_sql = """
|
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select {col} as value, count(*) as count
|
|
{from_sql}
|
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group by {col} order by count desc limit 20
|
|
""".format(
|
|
col=escape_sqlite(column), from_sql=from_sql
|
|
)
|
|
try:
|
|
facet_rows = await self.execute(
|
|
name, facet_sql, params, truncate=False, custom_time_limit=200
|
|
)
|
|
facet_results[column] = [
|
|
{
|
|
"value": row["value"],
|
|
"count": row["count"],
|
|
"toggle_url": urllib.parse.urljoin(
|
|
request.url,
|
|
path_with_added_args(request, {column: row["value"]}),
|
|
),
|
|
}
|
|
for row in facet_rows
|
|
]
|
|
except sqlite3.OperationalError:
|
|
# Hit time limit
|
|
pass
|
|
|
|
columns = [r[0] for r in description]
|
|
rows = list(rows)
|
|
|
|
filter_columns = columns[:]
|
|
if use_rowid and filter_columns[0] == "rowid":
|
|
filter_columns = filter_columns[1:]
|
|
|
|
# Pagination next link
|
|
next_value = None
|
|
next_url = None
|
|
if len(rows) > page_size and page_size > 0:
|
|
if is_view:
|
|
next_value = int(_next or 0) + page_size
|
|
else:
|
|
next_value = path_from_row_pks(rows[-2], pks, use_rowid)
|
|
# If there's a sort or sort_desc, add that value as a prefix
|
|
if (sort or sort_desc) and not is_view:
|
|
prefix = rows[-2][sort or sort_desc]
|
|
if prefix is None:
|
|
prefix = "$null"
|
|
else:
|
|
prefix = urllib.parse.quote_plus(str(prefix))
|
|
next_value = "{},{}".format(prefix, next_value)
|
|
added_args = {"_next": next_value}
|
|
if sort:
|
|
added_args["_sort"] = sort
|
|
else:
|
|
added_args["_sort_desc"] = sort_desc
|
|
else:
|
|
added_args = {"_next": next_value}
|
|
next_url = urllib.parse.urljoin(
|
|
request.url, path_with_added_args(request, added_args)
|
|
)
|
|
rows = rows[:page_size]
|
|
|
|
# Number of filtered rows in whole set:
|
|
filtered_table_rows_count = None
|
|
if count_sql:
|
|
try:
|
|
count_rows = list(await self.execute(name, count_sql, params))
|
|
filtered_table_rows_count = count_rows[0][0]
|
|
except sqlite3.OperationalError:
|
|
# Almost certainly hit the timeout
|
|
pass
|
|
|
|
# human_description_en combines filters AND search, if provided
|
|
human_description_en = filters.human_description_en(extra=search_descriptions)
|
|
|
|
if sort or sort_desc:
|
|
sorted_by = "sorted by {}{}".format(
|
|
(sort or sort_desc), " descending" if sort_desc else ""
|
|
)
|
|
human_description_en = " ".join(
|
|
[b for b in [human_description_en, sorted_by] if b]
|
|
)
|
|
|
|
async def extra_template():
|
|
display_columns, display_rows = await self.display_columns_and_rows(
|
|
name,
|
|
table,
|
|
description,
|
|
rows,
|
|
link_column=not is_view,
|
|
expand_foreign_keys=True,
|
|
)
|
|
metadata = self.ds.metadata.get("databases", {}).get(name, {}).get(
|
|
"tables", {}
|
|
).get(
|
|
table, {}
|
|
)
|
|
self.ds.update_with_inherited_metadata(metadata)
|
|
return {
|
|
"database_hash": hash,
|
|
"supports_search": bool(fts_table),
|
|
"search": search or "",
|
|
"use_rowid": use_rowid,
|
|
"filters": filters,
|
|
"display_columns": display_columns,
|
|
"filter_columns": filter_columns,
|
|
"display_rows": display_rows,
|
|
"is_sortable": any(c["sortable"] for c in display_columns),
|
|
"path_with_added_args": path_with_added_args,
|
|
"request": request,
|
|
"sort": sort,
|
|
"sort_desc": sort_desc,
|
|
"disable_sort": is_view,
|
|
"custom_rows_and_columns_templates": [
|
|
"_rows_and_columns-{}-{}.html".format(
|
|
to_css_class(name), to_css_class(table)
|
|
),
|
|
"_rows_and_columns-table-{}-{}.html".format(
|
|
to_css_class(name), to_css_class(table)
|
|
),
|
|
"_rows_and_columns.html",
|
|
],
|
|
"metadata": metadata,
|
|
}
|
|
|
|
return {
|
|
"database": name,
|
|
"table": table,
|
|
"is_view": is_view,
|
|
"view_definition": view_definition,
|
|
"table_definition": table_definition,
|
|
"human_description_en": human_description_en,
|
|
"rows": rows[:page_size],
|
|
"truncated": truncated,
|
|
"table_rows_count": table_rows_count,
|
|
"filtered_table_rows_count": filtered_table_rows_count,
|
|
"columns": columns,
|
|
"primary_keys": pks,
|
|
"units": units,
|
|
"query": {"sql": sql, "params": params},
|
|
"facet_results": facet_results,
|
|
"next": next_value and str(next_value) or None,
|
|
"next_url": next_url,
|
|
}, extra_template, (
|
|
"table-{}-{}.html".format(to_css_class(name), to_css_class(table)),
|
|
"table.html",
|
|
)
|
|
|
|
|
|
class RowView(RowTableShared):
|
|
|
|
async def data(self, request, name, hash, table, pk_path):
|
|
table = urllib.parse.unquote_plus(table)
|
|
pk_values = urlsafe_components(pk_path)
|
|
info = self.ds.inspect()[name]
|
|
table_info = info["tables"].get(table) or {}
|
|
pks = table_info.get("primary_keys") or []
|
|
use_rowid = not pks
|
|
select = "*"
|
|
if use_rowid:
|
|
select = "rowid, *"
|
|
pks = ["rowid"]
|
|
wheres = ['"{}"=:p{}'.format(pk, i) for i, pk in enumerate(pks)]
|
|
sql = 'select {} from "{}" where {}'.format(select, table, " AND ".join(wheres))
|
|
params = {}
|
|
for i, pk_value in enumerate(pk_values):
|
|
params["p{}".format(i)] = pk_value
|
|
# rows, truncated, description = await self.execute(name, sql, params, truncate=True)
|
|
rows, truncated, description = await self.execute(
|
|
name, sql, params, truncate=True
|
|
)
|
|
columns = [r[0] for r in description]
|
|
rows = list(rows)
|
|
if not rows:
|
|
raise NotFound("Record not found: {}".format(pk_values))
|
|
|
|
async def template_data():
|
|
display_columns, display_rows = await self.display_columns_and_rows(
|
|
name,
|
|
table,
|
|
description,
|
|
rows,
|
|
link_column=False,
|
|
expand_foreign_keys=True,
|
|
)
|
|
for column in display_columns:
|
|
column["sortable"] = False
|
|
return {
|
|
"database_hash": hash,
|
|
"foreign_key_tables": await self.foreign_key_tables(
|
|
name, table, pk_values
|
|
),
|
|
"display_columns": display_columns,
|
|
"display_rows": display_rows,
|
|
"custom_rows_and_columns_templates": [
|
|
"_rows_and_columns-{}-{}.html".format(
|
|
to_css_class(name), to_css_class(table)
|
|
),
|
|
"_rows_and_columns-row-{}-{}.html".format(
|
|
to_css_class(name), to_css_class(table)
|
|
),
|
|
"_rows_and_columns.html",
|
|
],
|
|
"metadata": self.ds.metadata.get("databases", {}).get(name, {}).get(
|
|
"tables", {}
|
|
).get(
|
|
table, {}
|
|
),
|
|
}
|
|
|
|
data = {
|
|
"database": name,
|
|
"table": table,
|
|
"rows": rows,
|
|
"columns": columns,
|
|
"primary_keys": pks,
|
|
"primary_key_values": pk_values,
|
|
"units": self.table_metadata(name, table).get("units", {}),
|
|
}
|
|
|
|
if "foreign_key_tables" in (request.raw_args.get("_extras") or "").split(","):
|
|
data["foreign_key_tables"] = await self.foreign_key_tables(
|
|
name, table, pk_values
|
|
)
|
|
|
|
return data, template_data, (
|
|
"row-{}-{}.html".format(to_css_class(name), to_css_class(table)), "row.html"
|
|
)
|
|
|
|
async def foreign_key_tables(self, name, table, pk_values):
|
|
if len(pk_values) != 1:
|
|
return []
|
|
|
|
table_info = self.ds.inspect()[name]["tables"].get(table)
|
|
if not table_info:
|
|
return []
|
|
|
|
foreign_keys = table_info["foreign_keys"]["incoming"]
|
|
if len(foreign_keys) == 0:
|
|
return []
|
|
|
|
sql = "select " + ", ".join(
|
|
[
|
|
'(select count(*) from {table} where "{column}"=:id)'.format(
|
|
table=escape_sqlite(fk["other_table"]), column=fk["other_column"]
|
|
)
|
|
for fk in foreign_keys
|
|
]
|
|
)
|
|
try:
|
|
rows = list(await self.execute(name, sql, {"id": pk_values[0]}))
|
|
except sqlite3.OperationalError:
|
|
# Almost certainly hit the timeout
|
|
return []
|
|
|
|
foreign_table_counts = dict(
|
|
zip(
|
|
[(fk["other_table"], fk["other_column"]) for fk in foreign_keys],
|
|
list(rows[0]),
|
|
)
|
|
)
|
|
foreign_key_tables = []
|
|
for fk in foreign_keys:
|
|
count = foreign_table_counts.get(
|
|
(fk["other_table"], fk["other_column"])
|
|
) or 0
|
|
foreign_key_tables.append({**fk, **{"count": count}})
|
|
return foreign_key_tables
|