kopia lustrzana https://github.com/simonw/datasette
737 wiersze
27 KiB
Python
737 wiersze
27 KiB
Python
import asyncio
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import collections
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import hashlib
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import os
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import sys
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import threading
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import traceback
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import urllib.parse
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from concurrent import futures
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from pathlib import Path
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import click
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from markupsafe import Markup
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from jinja2 import ChoiceLoader, Environment, FileSystemLoader, PrefixLoader
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import uvicorn
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from .views.base import DatasetteError, ureg, AsgiRouter
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from .views.database import DatabaseDownload, DatabaseView
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from .views.index import IndexView
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from .views.special import JsonDataView
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from .views.table import RowView, TableView
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from .renderer import json_renderer
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from .database import Database
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from .utils import (
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QueryInterrupted,
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Results,
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escape_css_string,
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escape_sqlite,
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get_plugins,
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module_from_path,
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sqlite3,
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sqlite_timelimit,
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to_css_class,
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)
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from .utils.asgi import (
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AsgiLifespan,
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NotFound,
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asgi_static,
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asgi_send,
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asgi_send_html,
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asgi_send_json,
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asgi_send_redirect,
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)
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from .tracer import trace, AsgiTracer
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from .plugins import pm, DEFAULT_PLUGINS
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from .version import __version__
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app_root = Path(__file__).parent.parent
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connections = threading.local()
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MEMORY = object()
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ConfigOption = collections.namedtuple("ConfigOption", ("name", "default", "help"))
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CONFIG_OPTIONS = (
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ConfigOption("default_page_size", 100, "Default page size for the table view"),
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ConfigOption(
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"max_returned_rows",
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1000,
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"Maximum rows that can be returned from a table or custom query",
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),
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ConfigOption(
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"num_sql_threads",
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3,
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"Number of threads in the thread pool for executing SQLite queries",
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),
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ConfigOption(
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"sql_time_limit_ms", 1000, "Time limit for a SQL query in milliseconds"
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),
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ConfigOption(
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"default_facet_size", 30, "Number of values to return for requested facets"
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),
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ConfigOption(
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"facet_time_limit_ms", 200, "Time limit for calculating a requested facet"
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),
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ConfigOption(
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"facet_suggest_time_limit_ms",
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50,
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"Time limit for calculating a suggested facet",
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),
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ConfigOption(
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"hash_urls",
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False,
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"Include DB file contents hash in URLs, for far-future caching",
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),
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ConfigOption(
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"allow_facet",
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True,
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"Allow users to specify columns to facet using ?_facet= parameter",
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),
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ConfigOption(
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"allow_download",
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True,
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"Allow users to download the original SQLite database files",
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),
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ConfigOption("suggest_facets", True, "Calculate and display suggested facets"),
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ConfigOption("allow_sql", True, "Allow arbitrary SQL queries via ?sql= parameter"),
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ConfigOption(
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"default_cache_ttl",
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5,
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"Default HTTP cache TTL (used in Cache-Control: max-age= header)",
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),
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ConfigOption(
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"default_cache_ttl_hashed",
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365 * 24 * 60 * 60,
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"Default HTTP cache TTL for hashed URL pages",
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),
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ConfigOption(
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"cache_size_kb", 0, "SQLite cache size in KB (0 == use SQLite default)"
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),
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ConfigOption(
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"allow_csv_stream",
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True,
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"Allow .csv?_stream=1 to download all rows (ignoring max_returned_rows)",
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),
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ConfigOption(
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"max_csv_mb",
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100,
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"Maximum size allowed for CSV export in MB - set 0 to disable this limit",
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),
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ConfigOption(
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"truncate_cells_html",
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2048,
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"Truncate cells longer than this in HTML table view - set 0 to disable",
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),
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ConfigOption(
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"force_https_urls",
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False,
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"Force URLs in API output to always use https:// protocol",
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),
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)
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DEFAULT_CONFIG = {option.name: option.default for option in CONFIG_OPTIONS}
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async def favicon(scope, receive, send):
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await asgi_send(send, "", 200)
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class Datasette:
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def __init__(
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self,
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files,
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immutables=None,
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cache_headers=True,
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cors=False,
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inspect_data=None,
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metadata=None,
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sqlite_extensions=None,
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template_dir=None,
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plugins_dir=None,
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static_mounts=None,
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memory=False,
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config=None,
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version_note=None,
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):
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immutables = immutables or []
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self.files = tuple(files) + tuple(immutables)
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self.immutables = set(immutables)
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if not self.files:
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self.files = [MEMORY]
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elif memory:
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self.files = (MEMORY,) + self.files
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self.databases = collections.OrderedDict()
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self.inspect_data = inspect_data
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for file in self.files:
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path = file
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is_memory = False
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if file is MEMORY:
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path = None
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is_memory = True
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is_mutable = path not in self.immutables
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db = Database(self, path, is_mutable=is_mutable, is_memory=is_memory)
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if db.name in self.databases:
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raise Exception("Multiple files with same stem: {}".format(db.name))
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self.databases[db.name] = db
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self.cache_headers = cache_headers
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self.cors = cors
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self._metadata = metadata or {}
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self.sqlite_functions = []
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self.sqlite_extensions = sqlite_extensions or []
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self.template_dir = template_dir
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self.plugins_dir = plugins_dir
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self.static_mounts = static_mounts or []
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self._config = dict(DEFAULT_CONFIG, **(config or {}))
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self.renderers = {} # File extension -> renderer function
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self.version_note = version_note
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self.executor = futures.ThreadPoolExecutor(
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max_workers=self.config("num_sql_threads")
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)
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self.max_returned_rows = self.config("max_returned_rows")
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self.sql_time_limit_ms = self.config("sql_time_limit_ms")
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self.page_size = self.config("default_page_size")
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# Execute plugins in constructor, to ensure they are available
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# when the rest of `datasette inspect` executes
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if self.plugins_dir:
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for filename in os.listdir(self.plugins_dir):
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filepath = os.path.join(self.plugins_dir, filename)
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mod = module_from_path(filepath, name=filename)
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try:
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pm.register(mod)
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except ValueError:
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# Plugin already registered
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pass
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async def run_sanity_checks(self):
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# Only one check right now, for Spatialite
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for database_name, database in self.databases.items():
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# Run pragma_info on every table
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for table in await database.table_names():
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try:
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await self.execute(
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database_name,
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"PRAGMA table_info({});".format(escape_sqlite(table)),
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)
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except sqlite3.OperationalError as e:
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if e.args[0] == "no such module: VirtualSpatialIndex":
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raise click.UsageError(
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"It looks like you're trying to load a SpatiaLite"
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" database without first loading the SpatiaLite module."
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"\n\nRead more: https://datasette.readthedocs.io/en/latest/spatialite.html"
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)
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else:
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raise
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def config(self, key):
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return self._config.get(key, None)
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def config_dict(self):
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# Returns a fully resolved config dictionary, useful for templates
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return {option.name: self.config(option.name) for option in CONFIG_OPTIONS}
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def metadata(self, key=None, database=None, table=None, fallback=True):
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"""
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Looks up metadata, cascading backwards from specified level.
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Returns None if metadata value is not found.
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"""
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assert not (
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database is None and table is not None
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), "Cannot call metadata() with table= specified but not database="
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databases = self._metadata.get("databases") or {}
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search_list = []
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if database is not None:
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search_list.append(databases.get(database) or {})
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if table is not None:
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table_metadata = ((databases.get(database) or {}).get("tables") or {}).get(
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table
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) or {}
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search_list.insert(0, table_metadata)
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search_list.append(self._metadata)
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if not fallback:
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# No fallback allowed, so just use the first one in the list
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search_list = search_list[:1]
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if key is not None:
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for item in search_list:
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if key in item:
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return item[key]
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return None
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else:
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# Return the merged list
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m = {}
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for item in search_list:
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m.update(item)
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return m
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def plugin_config(self, plugin_name, database=None, table=None, fallback=True):
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"Return config for plugin, falling back from specified database/table"
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plugins = self.metadata(
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"plugins", database=database, table=table, fallback=fallback
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)
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if plugins is None:
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return None
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plugin_config = plugins.get(plugin_name)
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# Resolve any $file and $env keys
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if isinstance(plugin_config, dict):
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# Create a copy so we don't mutate the version visible at /-/metadata.json
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plugin_config_copy = dict(plugin_config)
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for key, value in plugin_config_copy.items():
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if isinstance(value, dict):
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if list(value.keys()) == ["$env"]:
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plugin_config_copy[key] = os.environ.get(
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list(value.values())[0]
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)
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elif list(value.keys()) == ["$file"]:
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plugin_config_copy[key] = open(list(value.values())[0]).read()
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return plugin_config_copy
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return plugin_config
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def app_css_hash(self):
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if not hasattr(self, "_app_css_hash"):
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self._app_css_hash = hashlib.sha1(
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open(os.path.join(str(app_root), "datasette/static/app.css"))
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.read()
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.encode("utf8")
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).hexdigest()[:6]
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return self._app_css_hash
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def get_canned_queries(self, database_name):
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queries = self.metadata("queries", database=database_name, fallback=False) or {}
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names = queries.keys()
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return [self.get_canned_query(database_name, name) for name in names]
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def get_canned_query(self, database_name, query_name):
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queries = self.metadata("queries", database=database_name, fallback=False) or {}
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query = queries.get(query_name)
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if query:
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if not isinstance(query, dict):
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query = {"sql": query}
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query["name"] = query_name
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return query
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def update_with_inherited_metadata(self, metadata):
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# Fills in source/license with defaults, if available
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metadata.update(
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{
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"source": metadata.get("source") or self.metadata("source"),
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"source_url": metadata.get("source_url") or self.metadata("source_url"),
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"license": metadata.get("license") or self.metadata("license"),
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"license_url": metadata.get("license_url")
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or self.metadata("license_url"),
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"about": metadata.get("about") or self.metadata("about"),
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"about_url": metadata.get("about_url") or self.metadata("about_url"),
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}
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)
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def prepare_connection(self, conn):
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conn.row_factory = sqlite3.Row
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conn.text_factory = lambda x: str(x, "utf-8", "replace")
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for name, num_args, func in self.sqlite_functions:
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conn.create_function(name, num_args, func)
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if self.sqlite_extensions:
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conn.enable_load_extension(True)
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for extension in self.sqlite_extensions:
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conn.execute("SELECT load_extension('{}')".format(extension))
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if self.config("cache_size_kb"):
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conn.execute("PRAGMA cache_size=-{}".format(self.config("cache_size_kb")))
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# pylint: disable=no-member
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pm.hook.prepare_connection(conn=conn)
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async def expand_foreign_keys(self, database, table, column, values):
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"Returns dict mapping (column, value) -> label"
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labeled_fks = {}
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db = self.databases[database]
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foreign_keys = await db.foreign_keys_for_table(table)
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# Find the foreign_key for this column
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try:
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fk = [
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foreign_key
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for foreign_key in foreign_keys
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if foreign_key["column"] == column
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][0]
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except IndexError:
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return {}
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label_column = await db.label_column_for_table(fk["other_table"])
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if not label_column:
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return {(fk["column"], value): str(value) for value in values}
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labeled_fks = {}
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sql = """
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select {other_column}, {label_column}
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from {other_table}
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where {other_column} in ({placeholders})
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""".format(
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other_column=escape_sqlite(fk["other_column"]),
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label_column=escape_sqlite(label_column),
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other_table=escape_sqlite(fk["other_table"]),
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placeholders=", ".join(["?"] * len(set(values))),
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)
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try:
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results = await self.execute(database, sql, list(set(values)))
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except QueryInterrupted:
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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)] = value
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return labeled_fks
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def absolute_url(self, request, path):
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url = urllib.parse.urljoin(request.url, path)
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if url.startswith("http://") and self.config("force_https_urls"):
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url = "https://" + url[len("http://") :]
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return url
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def register_custom_units(self):
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"Register any custom units defined in the metadata.json with Pint"
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for unit in self.metadata("custom_units") or []:
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ureg.define(unit)
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def connected_databases(self):
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return [
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{
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"name": d.name,
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"path": d.path,
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"size": d.size,
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"is_mutable": d.is_mutable,
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"is_memory": d.is_memory,
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"hash": d.hash,
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}
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for d in sorted(self.databases.values(), key=lambda d: d.name)
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]
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def versions(self):
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conn = sqlite3.connect(":memory:")
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self.prepare_connection(conn)
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sqlite_version = conn.execute("select sqlite_version()").fetchone()[0]
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sqlite_extensions = {}
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for extension, testsql, hasversion in (
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("json1", "SELECT json('{}')", False),
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("spatialite", "SELECT spatialite_version()", True),
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):
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try:
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result = conn.execute(testsql)
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if hasversion:
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sqlite_extensions[extension] = result.fetchone()[0]
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else:
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sqlite_extensions[extension] = None
|
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except Exception:
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pass
|
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# Figure out supported FTS versions
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fts_versions = []
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for fts in ("FTS5", "FTS4", "FTS3"):
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try:
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conn.execute(
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"CREATE VIRTUAL TABLE v{fts} USING {fts} (data)".format(fts=fts)
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)
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fts_versions.append(fts)
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except sqlite3.OperationalError:
|
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continue
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datasette_version = {"version": __version__}
|
|
if self.version_note:
|
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datasette_version["note"] = self.version_note
|
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return {
|
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"python": {
|
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"version": ".".join(map(str, sys.version_info[:3])),
|
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"full": sys.version,
|
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},
|
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"datasette": datasette_version,
|
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"asgi": "3.0",
|
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"uvicorn": uvicorn.__version__,
|
|
"sqlite": {
|
|
"version": sqlite_version,
|
|
"fts_versions": fts_versions,
|
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"extensions": sqlite_extensions,
|
|
"compile_options": [
|
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r[0] for r in conn.execute("pragma compile_options;").fetchall()
|
|
],
|
|
},
|
|
}
|
|
|
|
def plugins(self, show_all=False):
|
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ps = list(get_plugins(pm))
|
|
if not show_all:
|
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ps = [p for p in ps if p["name"] not in DEFAULT_PLUGINS]
|
|
return [
|
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{
|
|
"name": p["name"],
|
|
"static": p["static_path"] is not None,
|
|
"templates": p["templates_path"] is not None,
|
|
"version": p.get("version"),
|
|
}
|
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for p in ps
|
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]
|
|
|
|
def threads(self):
|
|
threads = list(threading.enumerate())
|
|
return {
|
|
"num_threads": len(threads),
|
|
"threads": [
|
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{"name": t.name, "ident": t.ident, "daemon": t.daemon} for t in threads
|
|
],
|
|
}
|
|
|
|
def table_metadata(self, database, table):
|
|
"Fetch table-specific metadata."
|
|
return (
|
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(self.metadata("databases") or {})
|
|
.get(database, {})
|
|
.get("tables", {})
|
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.get(table, {})
|
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)
|
|
|
|
async def execute_against_connection_in_thread(self, db_name, fn):
|
|
def in_thread():
|
|
conn = getattr(connections, db_name, None)
|
|
if not conn:
|
|
conn = self.databases[db_name].connect()
|
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self.prepare_connection(conn)
|
|
setattr(connections, db_name, conn)
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return fn(conn)
|
|
|
|
return await asyncio.get_event_loop().run_in_executor(self.executor, in_thread)
|
|
|
|
async def execute(
|
|
self,
|
|
db_name,
|
|
sql,
|
|
params=None,
|
|
truncate=False,
|
|
custom_time_limit=None,
|
|
page_size=None,
|
|
log_sql_errors=True,
|
|
):
|
|
"""Executes sql against db_name in a thread"""
|
|
page_size = page_size or self.page_size
|
|
|
|
def sql_operation_in_thread(conn):
|
|
time_limit_ms = self.sql_time_limit_ms
|
|
if custom_time_limit and custom_time_limit < time_limit_ms:
|
|
time_limit_ms = custom_time_limit
|
|
|
|
with sqlite_timelimit(conn, time_limit_ms):
|
|
try:
|
|
cursor = conn.cursor()
|
|
cursor.execute(sql, params or {})
|
|
max_returned_rows = self.max_returned_rows
|
|
if max_returned_rows == page_size:
|
|
max_returned_rows += 1
|
|
if max_returned_rows and truncate:
|
|
rows = cursor.fetchmany(max_returned_rows + 1)
|
|
truncated = len(rows) > max_returned_rows
|
|
rows = rows[:max_returned_rows]
|
|
else:
|
|
rows = cursor.fetchall()
|
|
truncated = False
|
|
except sqlite3.OperationalError as e:
|
|
if e.args == ("interrupted",):
|
|
raise QueryInterrupted(e, sql, params)
|
|
if log_sql_errors:
|
|
print(
|
|
"ERROR: conn={}, sql = {}, params = {}: {}".format(
|
|
conn, repr(sql), params, e
|
|
)
|
|
)
|
|
raise
|
|
|
|
if truncate:
|
|
return Results(rows, truncated, cursor.description)
|
|
|
|
else:
|
|
return Results(rows, False, cursor.description)
|
|
|
|
with trace("sql", database=db_name, sql=sql.strip(), params=params):
|
|
results = await self.execute_against_connection_in_thread(
|
|
db_name, sql_operation_in_thread
|
|
)
|
|
return results
|
|
|
|
def register_renderers(self):
|
|
""" Register output renderers which output data in custom formats. """
|
|
# Built-in renderers
|
|
self.renderers["json"] = json_renderer
|
|
|
|
# Hooks
|
|
hook_renderers = []
|
|
# pylint: disable=no-member
|
|
for hook in pm.hook.register_output_renderer(datasette=self):
|
|
if type(hook) == list:
|
|
hook_renderers += hook
|
|
else:
|
|
hook_renderers.append(hook)
|
|
|
|
for renderer in hook_renderers:
|
|
self.renderers[renderer["extension"]] = renderer["callback"]
|
|
|
|
def app(self):
|
|
"Returns an ASGI app function that serves the whole of Datasette"
|
|
default_templates = str(app_root / "datasette" / "templates")
|
|
template_paths = []
|
|
if self.template_dir:
|
|
template_paths.append(self.template_dir)
|
|
template_paths.extend(
|
|
[
|
|
plugin["templates_path"]
|
|
for plugin in get_plugins(pm)
|
|
if plugin["templates_path"]
|
|
]
|
|
)
|
|
template_paths.append(default_templates)
|
|
template_loader = ChoiceLoader(
|
|
[
|
|
FileSystemLoader(template_paths),
|
|
# Support {% extends "default:table.html" %}:
|
|
PrefixLoader(
|
|
{"default": FileSystemLoader(default_templates)}, delimiter=":"
|
|
),
|
|
]
|
|
)
|
|
self.jinja_env = Environment(
|
|
loader=template_loader, autoescape=True, enable_async=True
|
|
)
|
|
self.jinja_env.filters["escape_css_string"] = escape_css_string
|
|
self.jinja_env.filters["quote_plus"] = lambda u: urllib.parse.quote_plus(u)
|
|
self.jinja_env.filters["escape_sqlite"] = escape_sqlite
|
|
self.jinja_env.filters["to_css_class"] = to_css_class
|
|
# pylint: disable=no-member
|
|
pm.hook.prepare_jinja2_environment(env=self.jinja_env)
|
|
|
|
self.register_renderers()
|
|
|
|
routes = []
|
|
|
|
def add_route(view, regex):
|
|
routes.append((regex, view))
|
|
|
|
# Generate a regex snippet to match all registered renderer file extensions
|
|
renderer_regex = "|".join(r"\." + key for key in self.renderers.keys())
|
|
|
|
add_route(IndexView.as_asgi(self), r"/(?P<as_format>(\.jsono?)?$)")
|
|
# TODO: /favicon.ico and /-/static/ deserve far-future cache expires
|
|
add_route(favicon, "/favicon.ico")
|
|
|
|
add_route(
|
|
asgi_static(app_root / "datasette" / "static"), r"/-/static/(?P<path>.*)$"
|
|
)
|
|
for path, dirname in self.static_mounts:
|
|
add_route(asgi_static(dirname), r"/" + path + "/(?P<path>.*)$")
|
|
|
|
# Mount any plugin static/ directories
|
|
for plugin in get_plugins(pm):
|
|
if plugin["static_path"]:
|
|
add_route(
|
|
asgi_static(plugin["static_path"]),
|
|
"/-/static-plugins/{}/(?P<path>.*)$".format(plugin["name"]),
|
|
)
|
|
# Support underscores in name in addition to hyphens, see https://github.com/simonw/datasette/issues/611
|
|
add_route(
|
|
asgi_static(plugin["static_path"]),
|
|
"/-/static-plugins/{}/(?P<path>.*)$".format(
|
|
plugin["name"].replace("-", "_")
|
|
),
|
|
)
|
|
add_route(
|
|
JsonDataView.as_asgi(self, "metadata.json", lambda: self._metadata),
|
|
r"/-/metadata(?P<as_format>(\.json)?)$",
|
|
)
|
|
add_route(
|
|
JsonDataView.as_asgi(self, "versions.json", self.versions),
|
|
r"/-/versions(?P<as_format>(\.json)?)$",
|
|
)
|
|
add_route(
|
|
JsonDataView.as_asgi(self, "plugins.json", self.plugins),
|
|
r"/-/plugins(?P<as_format>(\.json)?)$",
|
|
)
|
|
add_route(
|
|
JsonDataView.as_asgi(self, "config.json", lambda: self._config),
|
|
r"/-/config(?P<as_format>(\.json)?)$",
|
|
)
|
|
add_route(
|
|
JsonDataView.as_asgi(self, "threads.json", self.threads),
|
|
r"/-/threads(?P<as_format>(\.json)?)$",
|
|
)
|
|
add_route(
|
|
JsonDataView.as_asgi(self, "databases.json", self.connected_databases),
|
|
r"/-/databases(?P<as_format>(\.json)?)$",
|
|
)
|
|
add_route(
|
|
DatabaseDownload.as_asgi(self), r"/(?P<db_name>[^/]+?)(?P<as_db>\.db)$"
|
|
)
|
|
add_route(
|
|
DatabaseView.as_asgi(self),
|
|
r"/(?P<db_name>[^/]+?)(?P<as_format>"
|
|
+ renderer_regex
|
|
+ r"|.jsono|\.csv)?$",
|
|
)
|
|
add_route(
|
|
TableView.as_asgi(self),
|
|
r"/(?P<db_name>[^/]+)/(?P<table_and_format>[^/]+?$)",
|
|
)
|
|
add_route(
|
|
RowView.as_asgi(self),
|
|
r"/(?P<db_name>[^/]+)/(?P<table>[^/]+?)/(?P<pk_path>[^/]+?)(?P<as_format>"
|
|
+ renderer_regex
|
|
+ r")?$",
|
|
)
|
|
self.register_custom_units()
|
|
|
|
async def setup_db():
|
|
# First time server starts up, calculate table counts for immutable databases
|
|
for dbname, database in self.databases.items():
|
|
if not database.is_mutable:
|
|
await database.table_counts(limit=60 * 60 * 1000)
|
|
|
|
asgi = AsgiLifespan(
|
|
AsgiTracer(DatasetteRouter(self, routes)), on_startup=setup_db
|
|
)
|
|
for wrapper in pm.hook.asgi_wrapper(datasette=self):
|
|
asgi = wrapper(asgi)
|
|
return asgi
|
|
|
|
|
|
class DatasetteRouter(AsgiRouter):
|
|
def __init__(self, datasette, routes):
|
|
self.ds = datasette
|
|
super().__init__(routes)
|
|
|
|
async def handle_404(self, scope, receive, send):
|
|
# If URL has a trailing slash, redirect to URL without it
|
|
path = scope.get("raw_path", scope["path"].encode("utf8"))
|
|
if path.endswith(b"/"):
|
|
path = path.rstrip(b"/")
|
|
if scope["query_string"]:
|
|
path += b"?" + scope["query_string"]
|
|
await asgi_send_redirect(send, path.decode("latin1"))
|
|
else:
|
|
await super().handle_404(scope, receive, send)
|
|
|
|
async def handle_500(self, scope, receive, send, exception):
|
|
title = None
|
|
if isinstance(exception, NotFound):
|
|
status = 404
|
|
info = {}
|
|
message = exception.args[0]
|
|
elif isinstance(exception, DatasetteError):
|
|
status = exception.status
|
|
info = exception.error_dict
|
|
message = exception.message
|
|
if exception.messagge_is_html:
|
|
message = Markup(message)
|
|
title = exception.title
|
|
else:
|
|
status = 500
|
|
info = {}
|
|
message = str(exception)
|
|
traceback.print_exc()
|
|
templates = ["500.html"]
|
|
if status != 500:
|
|
templates = ["{}.html".format(status)] + templates
|
|
info.update({"ok": False, "error": message, "status": status, "title": title})
|
|
headers = {}
|
|
if self.ds.cors:
|
|
headers["Access-Control-Allow-Origin"] = "*"
|
|
if scope["path"].split("?")[0].endswith(".json"):
|
|
await asgi_send_json(send, info, status=status, headers=headers)
|
|
else:
|
|
template = self.ds.jinja_env.select_template(templates)
|
|
await asgi_send_html(
|
|
send, await template.render_async(info), status=status, headers=headers
|
|
)
|