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app.py
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import asyncio
import click
import collections
import hashlib
import os
import sys
import threading
import traceback
import urllib.parse
from concurrent import futures
from pathlib import Path
from markupsafe import Markup
from jinja2 import ChoiceLoader, Environment, FileSystemLoader, PrefixLoader
from sanic import Sanic, response
from sanic.exceptions import InvalidUsage, NotFound
from .views.base import (
DatasetteError,
ureg
)
from .views.database import DatabaseDownload, DatabaseView
from .views.index import IndexView
from .views.special import JsonDataView
from .views.table import RowView, TableView
from .utils import (
InterruptedError,
Results,
escape_css_string,
escape_sqlite,
get_plugins,
module_from_path,
sqlite3,
sqlite_timelimit,
to_css_class
)
from .inspect import inspect_hash, inspect_views, inspect_tables
from .plugins import pm, DEFAULT_PLUGINS
from .version import __version__
app_root = Path(__file__).parent.parent
connections = threading.local()
MEMORY = object()
ConfigOption = collections.namedtuple(
"ConfigOption", ("name", "default", "help")
)
CONFIG_OPTIONS = (
ConfigOption("default_page_size", 100, """
Default page size for the table view
""".strip()),
ConfigOption("max_returned_rows", 1000, """
Maximum rows that can be returned from a table or custom query
""".strip()),
ConfigOption("num_sql_threads", 3, """
Number of threads in the thread pool for executing SQLite queries
""".strip()),
ConfigOption("sql_time_limit_ms", 1000, """
Time limit for a SQL query in milliseconds
""".strip()),
ConfigOption("default_facet_size", 30, """
Number of values to return for requested facets
""".strip()),
ConfigOption("facet_time_limit_ms", 200, """
Time limit for calculating a requested facet
""".strip()),
ConfigOption("facet_suggest_time_limit_ms", 50, """
Time limit for calculating a suggested facet
""".strip()),
ConfigOption("hash_urls", False, """
Include DB file contents hash in URLs, for far-future caching
""".strip()),
ConfigOption("allow_facet", True, """
Allow users to specify columns to facet using ?_facet= parameter
""".strip()),
ConfigOption("allow_download", True, """
Allow users to download the original SQLite database files
""".strip()),
ConfigOption("suggest_facets", True, """
Calculate and display suggested facets
""".strip()),
ConfigOption("allow_sql", True, """
Allow arbitrary SQL queries via ?sql= parameter
""".strip()),
ConfigOption("default_cache_ttl", 5, """
Default HTTP cache TTL (used in Cache-Control: max-age= header)
""".strip()),
ConfigOption("default_cache_ttl_hashed", 365 * 24 * 60 * 60, """
Default HTTP cache TTL for hashed URL pages
""".strip()),
ConfigOption("cache_size_kb", 0, """
SQLite cache size in KB (0 == use SQLite default)
""".strip()),
ConfigOption("allow_csv_stream", True, """
Allow .csv?_stream=1 to download all rows (ignoring max_returned_rows)
""".strip()),
ConfigOption("max_csv_mb", 100, """
Maximum size allowed for CSV export in MB - set 0 to disable this limit
""".strip()),
ConfigOption("truncate_cells_html", 2048, """
Truncate cells longer than this in HTML table view - set 0 to disable
""".strip()),
ConfigOption("force_https_urls", False, """
Force URLs in API output to always use https:// protocol
""".strip()),
)
DEFAULT_CONFIG = {
option.name: option.default
for option in CONFIG_OPTIONS
}
async def favicon(request):
return response.text("")
class Datasette:
def __init__(
self,
files,
immutables=None,
cache_headers=True,
cors=False,
inspect_data=None,
metadata=None,
sqlite_extensions=None,
template_dir=None,
plugins_dir=None,
static_mounts=None,
memory=False,
config=None,
version_note=None,
):
immutables = immutables or []
self.files = tuple(files) + tuple(immutables)
self.immutables = set(immutables)
if not self.files:
self.files = [MEMORY]
elif memory:
self.files = (MEMORY,) + self.files
self.cache_headers = cache_headers
self.cors = cors
self._inspect = inspect_data
self._metadata = metadata or {}
self.sqlite_functions = []
self.sqlite_extensions = sqlite_extensions or []
self.template_dir = template_dir
self.plugins_dir = plugins_dir
self.static_mounts = static_mounts or []
self._config = dict(DEFAULT_CONFIG, **(config or {}))
self.version_note = version_note
self.executor = futures.ThreadPoolExecutor(
max_workers=self.config("num_sql_threads")
)
self.max_returned_rows = self.config("max_returned_rows")
self.sql_time_limit_ms = self.config("sql_time_limit_ms")
self.page_size = self.config("default_page_size")
# Execute plugins in constructor, to ensure they are available
# when the rest of `datasette inspect` executes
if self.plugins_dir:
for filename in os.listdir(self.plugins_dir):
filepath = os.path.join(self.plugins_dir, filename)
mod = module_from_path(filepath, name=filename)
try:
pm.register(mod)
except ValueError:
# Plugin already registered
pass
def config(self, key):
return self._config.get(key, None)
def config_dict(self):
# Returns a fully resolved config dictionary, useful for templates
return {
option.name: self.config(option.name)
for option in CONFIG_OPTIONS
}
def metadata(self, key=None, database=None, table=None, fallback=True):
"""
Looks up metadata, cascading backwards from specified level.
Returns None if metadata value is not found.
"""
assert not (database is None and table is not None), \
"Cannot call metadata() with table= specified but not database="
databases = self._metadata.get("databases") or {}
search_list = []
if database is not None:
search_list.append(databases.get(database) or {})
if table is not None:
table_metadata = (
(databases.get(database) or {}).get("tables") or {}
).get(table) or {}
search_list.insert(0, table_metadata)
search_list.append(self._metadata)
if not fallback:
# No fallback allowed, so just use the first one in the list
search_list = search_list[:1]
if key is not None:
for item in search_list:
if key in item:
return item[key]
return None
else:
# Return the merged list
m = {}
for item in search_list:
m.update(item)
return m
def plugin_config(
self, plugin_name, database=None, table=None, fallback=True
):
"Return config for plugin, falling back from specified database/table"
plugins = self.metadata(
"plugins", database=database, table=table, fallback=fallback
)
if plugins is None:
return None
return plugins.get(plugin_name)
def app_css_hash(self):
if not hasattr(self, "_app_css_hash"):
self._app_css_hash = hashlib.sha1(
open(
os.path.join(str(app_root), "datasette/static/app.css")
).read().encode(
"utf8"
)
).hexdigest()[
:6
]
return self._app_css_hash
def get_canned_queries(self, database_name):
queries = self.metadata(
"queries", database=database_name, fallback=False
) or {}
names = queries.keys()
return [
self.get_canned_query(database_name, name) for name in names
]
def get_canned_query(self, database_name, query_name):
queries = self.metadata(
"queries", database=database_name, fallback=False
) or {}
query = queries.get(query_name)
if query:
if not isinstance(query, dict):
query = {"sql": query}
query["name"] = query_name
return query
async def get_table_definition(self, database_name, table, type_="table"):
table_definition_rows = list(
await self.execute(
database_name,
'select sql from sqlite_master where name = :n and type=:t',
{"n": table, "t": type_},
)
)
if not table_definition_rows:
return None
return table_definition_rows[0][0]
def get_view_definition(self, database_name, view):
return self.get_table_definition(database_name, view, 'view')
def update_with_inherited_metadata(self, metadata):
# Fills in source/license with defaults, if available
metadata.update(
{
"source": metadata.get("source") or self.metadata("source"),
"source_url": metadata.get("source_url")
or self.metadata("source_url"),
"license": metadata.get("license") or self.metadata("license"),
"license_url": metadata.get("license_url")
or self.metadata("license_url"),
"about": metadata.get("about") or self.metadata("about"),
"about_url": metadata.get("about_url")
or self.metadata("about_url"),
}
)
def prepare_connection(self, conn):
conn.row_factory = sqlite3.Row
conn.text_factory = lambda x: str(x, "utf-8", "replace")
for name, num_args, func in self.sqlite_functions:
conn.create_function(name, num_args, func)
if self.sqlite_extensions:
conn.enable_load_extension(True)
for extension in self.sqlite_extensions:
conn.execute("SELECT load_extension('{}')".format(extension))
if self.config("cache_size_kb"):
conn.execute('PRAGMA cache_size=-{}'.format(self.config("cache_size_kb")))
pm.hook.prepare_connection(conn=conn)
def table_exists(self, database, table):
return table in self.inspect().get(database, {}).get("tables")
def inspect(self):
" Inspect the database and return a dictionary of table metadata "
if self._inspect:
return self._inspect
self._inspect = {}
for filename in self.files:
if filename is MEMORY:
self._inspect[":memory:"] = {
"hash": "000",
"file": ":memory:",
"size": 0,
"views": {},
"tables": {},
}
else:
path = Path(filename)
name = path.stem
if name in self._inspect:
raise Exception("Multiple files with same stem %s" % name)
try:
with sqlite3.connect(
"file:{}?mode=ro".format(path), uri=True
) as conn:
self.prepare_connection(conn)
self._inspect[name] = {
"hash": inspect_hash(path),
"file": str(path),
"size": path.stat().st_size,
"views": inspect_views(conn),
"tables": inspect_tables(conn, (self.metadata("databases") or {}).get(name, {}))
}
except sqlite3.OperationalError as e:
if (e.args[0] == 'no such module: VirtualSpatialIndex'):
raise click.UsageError(
"It looks like you're trying to load a SpatiaLite"
" database without first loading the SpatiaLite module."
"\n\nRead more: https://datasette.readthedocs.io/en/latest/spatialite.html"
)
else:
raise
return self._inspect
def register_custom_units(self):
"Register any custom units defined in the metadata.json with Pint"
for unit in self.metadata("custom_units") or []:
ureg.define(unit)
def versions(self):
conn = sqlite3.connect(":memory:")
self.prepare_connection(conn)
sqlite_version = conn.execute("select sqlite_version()").fetchone()[0]
sqlite_extensions = {}
for extension, testsql, hasversion in (
("json1", "SELECT json('{}')", False),
("spatialite", "SELECT spatialite_version()", True),
):
try:
result = conn.execute(testsql)
if hasversion:
sqlite_extensions[extension] = result.fetchone()[0]
else:
sqlite_extensions[extension] = None
except Exception as e:
pass
# Figure out supported FTS versions
fts_versions = []
for fts in ("FTS5", "FTS4", "FTS3"):
try:
conn.execute(
"CREATE VIRTUAL TABLE v{fts} USING {fts} (data)".format(fts=fts)
)
fts_versions.append(fts)
except sqlite3.OperationalError:
continue
datasette_version = {"version": __version__}
if self.version_note:
datasette_version["note"] = self.version_note
return {
"python": {
"version": ".".join(map(str, sys.version_info[:3])), "full": sys.version
},
"datasette": datasette_version,
"sqlite": {
"version": sqlite_version,
"fts_versions": fts_versions,
"extensions": sqlite_extensions,
"compile_options": [
r[0] for r in conn.execute("pragma compile_options;").fetchall()
],
},
}
def plugins(self, show_all=False):
ps = list(get_plugins(pm))
if not show_all:
ps = [p for p in ps if p["name"] not in DEFAULT_PLUGINS]
return [
{
"name": p["name"],
"static": p["static_path"] is not None,
"templates": p["templates_path"] is not None,
"version": p.get("version"),
}
for p in ps
]
async def execute(
self,
db_name,
sql,
params=None,
truncate=False,
custom_time_limit=None,
page_size=None,
):
"""Executes sql against db_name in a thread"""
page_size = page_size or self.page_size
def sql_operation_in_thread():
conn = getattr(connections, db_name, None)
if not conn:
info = self.inspect()[db_name]
if info["file"] == ":memory:":
conn = sqlite3.connect(":memory:")
else:
# mode=ro or immutable=1?
if info["file"] in self.immutables:
qs = "immutable=1"
else:
qs = "mode=ro"
conn = sqlite3.connect(
"file:{}?{}".format(info["file"], qs),
uri=True,
check_same_thread=False,
)
self.prepare_connection(conn)
setattr(connections, db_name, 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 InterruptedError(e)
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)
return await asyncio.get_event_loop().run_in_executor(
self.executor, sql_operation_in_thread
)
def app(self):
app = Sanic(__name__)
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)
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
pm.hook.prepare_jinja2_environment(env=self.jinja_env)
app.add_route(IndexView.as_view(self), r"/<as_format:(\.jsono?)?$>")
# TODO: /favicon.ico and /-/static/ deserve far-future cache expires
app.add_route(favicon, "/favicon.ico")
app.static("/-/static/", str(app_root / "datasette" / "static"))
for path, dirname in self.static_mounts:
app.static(path, dirname)
# Mount any plugin static/ directories
for plugin in get_plugins(pm):
if plugin["static_path"]:
modpath = "/-/static-plugins/{}/".format(plugin["name"])
app.static(modpath, plugin["static_path"])
app.add_route(
JsonDataView.as_view(self, "inspect.json", self.inspect),
r"/-/inspect<as_format:(\.json)?$>",
)
app.add_route(
JsonDataView.as_view(self, "metadata.json", lambda: self._metadata),
r"/-/metadata<as_format:(\.json)?$>",
)
app.add_route(
JsonDataView.as_view(self, "versions.json", self.versions),
r"/-/versions<as_format:(\.json)?$>",
)
app.add_route(
JsonDataView.as_view(self, "plugins.json", self.plugins),
r"/-/plugins<as_format:(\.json)?$>",
)
app.add_route(
JsonDataView.as_view(self, "config.json", lambda: self._config),
r"/-/config<as_format:(\.json)?$>",
)
app.add_route(
DatabaseDownload.as_view(self), r"/<db_name:[^/]+?><as_db:(\.db)$>"
)
app.add_route(
DatabaseView.as_view(self), r"/<db_name:[^/]+?><as_format:(\.jsono?|\.csv)?$>"
)
app.add_route(
TableView.as_view(self),
r"/<db_name:[^/]+>/<table_and_format:[^/]+?$>",
)
app.add_route(
RowView.as_view(self),
r"/<db_name:[^/]+>/<table:[^/]+?>/<pk_path:[^/]+?><as_format:(\.jsono?)?$>",
)
self.register_custom_units()
# On 404 with a trailing slash redirect to path without that slash:
@app.middleware("response")
def redirect_on_404_with_trailing_slash(request, original_response):
if original_response.status == 404 and request.path.endswith("/"):
path = request.path.rstrip("/")
if request.query_string:
path = "{}?{}".format(path, request.query_string)
return response.redirect(path)
@app.exception(Exception)
def on_exception(request, exception):
title = None
help = None
if isinstance(exception, NotFound):
status = 404
info = {}
message = exception.args[0]
elif isinstance(exception, InvalidUsage):
status = 405
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}
)
if request is not None and request.path.split("?")[0].endswith(".json"):
return response.json(info, status=status)
else:
template = self.jinja_env.select_template(templates)
return response.html(template.render(info), status=status)
return app