kopia lustrzana https://github.com/simonw/datasette
394 wiersze
14 KiB
Python
394 wiersze
14 KiB
Python
import asyncio
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import json
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import re
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import sqlite3
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import threading
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import time
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import pint
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from sanic import response
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from sanic.exceptions import NotFound
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from sanic.views import HTTPMethodView
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from datasette import __version__
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from datasette.utils import (
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CustomJSONEncoder,
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InterruptedError,
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InvalidSql,
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path_from_row_pks,
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path_with_added_args,
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path_with_ext,
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sqlite_timelimit,
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to_css_class
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)
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from datasette import connectors
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connections = threading.local()
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ureg = pint.UnitRegistry()
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HASH_BLOCK_SIZE = 1024 * 1024
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HASH_LENGTH = 7
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class DatasetteError(Exception):
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def __init__(self, message, title=None, error_dict=None, status=500, template=None):
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self.message = message
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self.title = title
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self.error_dict = error_dict or {}
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self.status = status
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class RenderMixin(HTTPMethodView):
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def render(self, templates, **context):
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template = self.jinja_env.select_template(templates)
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select_templates = [
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"{}{}".format("*" if template_name == template.name else "", template_name)
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for template_name in templates
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]
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return response.html(
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template.render(
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{
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**context,
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**{
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"app_css_hash": self.ds.app_css_hash(),
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"select_templates": select_templates,
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"zip": zip,
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}
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}
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)
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)
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class BaseView(RenderMixin):
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re_named_parameter = re.compile(":([a-zA-Z0-9_]+)")
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def __init__(self, datasette):
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self.ds = datasette
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self.files = datasette.files
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self.jinja_env = datasette.jinja_env
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self.executor = datasette.executor
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self.page_size = datasette.page_size
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self.max_returned_rows = datasette.max_returned_rows
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def table_metadata(self, database, table):
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"Fetch table-specific metadata."
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return self.ds.metadata.get("databases", {}).get(database, {}).get(
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"tables", {}
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).get(
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table, {}
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)
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def options(self, request, *args, **kwargs):
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r = response.text("ok")
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if self.ds.cors:
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r.headers["Access-Control-Allow-Origin"] = "*"
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return r
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def redirect(self, request, path, forward_querystring=True):
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if request.query_string and "?" not in path and forward_querystring:
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path = "{}?{}".format(path, request.query_string)
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r = response.redirect(path)
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r.headers["Link"] = "<{}>; rel=preload".format(path)
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if self.ds.cors:
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r.headers["Access-Control-Allow-Origin"] = "*"
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return r
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def resolve_db_name(self, db_name, **kwargs):
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databases = self.ds.inspect()
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hash = None
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name = None
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if "-" in db_name:
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# Might be name-and-hash, or might just be
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# a name with a hyphen in it
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name, hash = db_name.rsplit("-", 1)
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if name not in databases:
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# Try the whole name
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name = db_name
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hash = None
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else:
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name = db_name
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# Verify the hash
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try:
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info = databases[name]
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except KeyError:
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raise NotFound("Database not found: {}".format(name))
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expected = info["hash"][:HASH_LENGTH]
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if expected != hash:
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should_redirect = "/{}-{}".format(name, expected)
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if "table" in kwargs:
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should_redirect += "/" + kwargs["table"]
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if "pk_path" in kwargs:
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should_redirect += "/" + kwargs["pk_path"]
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if "as_json" in kwargs:
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should_redirect += kwargs["as_json"]
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if "as_db" in kwargs:
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should_redirect += kwargs["as_db"]
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return name, expected, should_redirect
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return name, expected, None
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async def execute(
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self,
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db_name,
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sql,
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params=None,
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truncate=False,
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custom_time_limit=None,
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page_size=None,
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):
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"""Executes sql against db_name in a thread"""
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page_size = page_size or self.page_size
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def sql_operation_in_thread():
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conn = getattr(connections, db_name, None)
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if not conn:
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info = self.ds.inspect()[db_name]
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if info['dbtype'] == 'sqlite3':
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conn = sqlite3.connect(
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"file:{}?immutable=1".format(info["file"]),
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uri=True,
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check_same_thread=False,
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)
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self.ds.prepare_connection(conn)
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else:
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conn = connectors.connect(info['file'], info['dbtype'])
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setattr(connections, db_name, conn)
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if isinstance(conn, sqlite3.Connection):
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time_limit_ms = self.ds.sql_time_limit_ms
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if custom_time_limit and custom_time_limit < self.ds.sql_time_limit_ms:
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time_limit_ms = custom_time_limit
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with sqlite_timelimit(conn, time_limit_ms):
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try:
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cursor = conn.cursor()
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cursor.execute(sql, params or {})
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max_returned_rows = self.max_returned_rows
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if max_returned_rows == page_size:
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max_returned_rows += 1
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if max_returned_rows and truncate:
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rows = cursor.fetchmany(max_returned_rows + 1)
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truncated = len(rows) > max_returned_rows
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rows = rows[:max_returned_rows]
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else:
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rows = cursor.fetchall()
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truncated = False
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except sqlite3.OperationalError as e:
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if e.args == ('interrupted',):
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raise InterruptedError(e)
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print(
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"ERROR: conn={}, sql = {}, params = {}: {}".format(
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conn, repr(sql), params, e
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)
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)
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raise
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if truncate:
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return rows, truncated, cursor.description
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else:
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return rows
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else:
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return conn.execute(
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sql,
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params or {},
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truncate=truncate,
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page_size=page_size,
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max_returned_rows=self.max_returned_rows,
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)
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return await asyncio.get_event_loop().run_in_executor(
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self.executor, sql_operation_in_thread
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)
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def get_templates(self, database, table=None):
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assert NotImplemented
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async def get(self, request, db_name, **kwargs):
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name, hash, should_redirect = self.resolve_db_name(db_name, **kwargs)
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if should_redirect:
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return self.redirect(request, should_redirect)
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return await self.view_get(request, name, hash, **kwargs)
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async def view_get(self, request, name, hash, **kwargs):
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try:
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as_json = kwargs.pop("as_json")
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except KeyError:
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as_json = False
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extra_template_data = {}
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start = time.time()
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status_code = 200
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templates = []
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try:
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response_or_template_contexts = await self.data(
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request, name, hash, **kwargs
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)
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if isinstance(response_or_template_contexts, response.HTTPResponse):
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return response_or_template_contexts
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else:
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data, extra_template_data, templates = response_or_template_contexts
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except InterruptedError as e:
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raise DatasetteError(str(e), title="SQL Interrupted", status=400)
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except (sqlite3.OperationalError, InvalidSql) as e:
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raise DatasetteError(str(e), title="Invalid SQL", status=400)
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except (sqlite3.OperationalError) as e:
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raise DatasetteError(str(e))
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except DatasetteError:
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raise
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end = time.time()
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data["query_ms"] = (end - start) * 1000
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for key in ("source", "source_url", "license", "license_url"):
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value = self.ds.metadata.get(key)
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if value:
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data[key] = value
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if as_json:
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# Special case for .jsono extension - redirect to _shape=objects
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if as_json == ".jsono":
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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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{"_shape": "objects"},
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path=request.path.rsplit(".jsono", 1)[0] + ".json",
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),
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forward_querystring=False,
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)
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# Deal with the _shape option
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shape = request.args.get("_shape", "arrays")
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if 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 = "_shape=object not available for tables with no primary keys"
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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 = {
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"ok": False,
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"error": error,
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"database": name,
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"database_hash": hash,
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}
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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": "Invalid _shape: {}".format(shape),
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"status": 400,
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"title": None,
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}
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headers = {}
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if self.ds.cors:
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headers["Access-Control-Allow-Origin"] = "*"
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r = response.HTTPResponse(
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json.dumps(data, cls=CustomJSONEncoder),
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status=status_code,
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content_type="application/json",
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headers=headers,
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)
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else:
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extras = {}
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if callable(extra_template_data):
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extras = extra_template_data()
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if asyncio.iscoroutine(extras):
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extras = await extras
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else:
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extras = extra_template_data
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context = {
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**data,
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**extras,
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**{
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"url_json": path_with_ext(request, ".json"),
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"url_jsono": path_with_ext(request, ".jsono"),
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"extra_css_urls": self.ds.extra_css_urls(),
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"extra_js_urls": self.ds.extra_js_urls(),
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"datasette_version": __version__,
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}
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}
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if "metadata" not in context:
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context["metadata"] = self.ds.metadata
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r = self.render(templates, **context)
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r.status = status_code
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# Set far-future cache expiry
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if self.ds.cache_headers:
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r.headers["Cache-Control"] = "max-age={}".format(365 * 24 * 60 * 60)
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return r
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async def custom_sql(
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self, request, name, hash, sql, editable=True, canned_query=None
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):
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params = request.raw_args
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if "sql" in params:
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params.pop("sql")
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if "_shape" in params:
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params.pop("_shape")
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# Extract any :named parameters
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named_parameters = self.re_named_parameter.findall(sql)
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named_parameter_values = {
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named_parameter: params.get(named_parameter) or ""
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for named_parameter in named_parameters
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}
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# Set to blank string if missing from params
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for named_parameter in named_parameters:
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if named_parameter not in params:
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params[named_parameter] = ""
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extra_args = {}
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if params.get("_timelimit"):
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extra_args["custom_time_limit"] = int(params["_timelimit"])
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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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columns = [r[0] for r in description]
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templates = ["query-{}.html".format(to_css_class(name)), "query.html"]
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if canned_query:
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templates.insert(
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0,
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"query-{}-{}.html".format(
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to_css_class(name), to_css_class(canned_query)
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),
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)
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return {
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"database": name,
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"rows": rows,
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"truncated": truncated,
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"columns": columns,
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"query": {"sql": sql, "params": params},
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}, {
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"database_hash": hash,
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"custom_sql": True,
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"named_parameter_values": named_parameter_values,
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"editable": editable,
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"canned_query": canned_query,
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}, templates
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