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Source code for galaxy.web.framework.base
"""
A simple WSGI application/framework.
"""
import io
import json
import logging
import os
import socket
import tarfile
import tempfile
import time
import types
from http.cookies import (
CookieError,
SimpleCookie,
)
from importlib import import_module
from urllib.parse import urljoin
import routes
import webob.compat
import webob.cookies
import webob.exc
import webob.exc as httpexceptions
# We will use some very basic HTTP/wsgi utilities from the paste library
from paste.response import HeaderDict
from galaxy.util import smart_str
from galaxy.util.resources import resource_string
log = logging.getLogger(__name__)
#: time of the most recent server startup
server_starttime = int(time.time())
try:
meta_json = json.loads(resource_string(__package__, "meta.json"))
server_starttime = meta_json.get("epoch") or server_starttime
except Exception:
meta_json = {}
def __resource_with_deleted(self, member_name, collection_name, **kwargs):
"""
Method to monkeypatch on to routes.mapper.Mapper which does the same thing
as resource() with the addition of standardized routes for handling
elements in Galaxy's "deleted but not really deleted" fashion.
"""
collection_path = f"{kwargs.get('path_prefix', '')}/{collection_name}/deleted"
member_path = f"{collection_path}/{{id}}"
self.connect(
f"deleted_{collection_name}",
collection_path,
controller=collection_name,
action="index",
deleted=True,
conditions=dict(method=["GET"]),
)
self.connect(
f"deleted_{member_name}",
member_path,
controller=collection_name,
action="show",
deleted=True,
conditions=dict(method=["GET"]),
)
self.connect(
f"undelete_deleted_{member_name}",
f"{member_path}/undelete",
controller=collection_name,
action="undelete",
conditions=dict(method=["POST"]),
)
self.resource(member_name, collection_name, **kwargs)
routes.Mapper.resource_with_deleted = __resource_with_deleted
[docs]class WebApplication:
"""
A simple web application which maps requests to objects using routes,
and to methods on those objects in the CherryPy style. Thus simple
argument mapping in the CherryPy style occurs automatically, but more
complicated encoding of arguments in the PATH_INFO can be performed
with routes.
"""
[docs] def __init__(self):
"""
Create a new web application object. To actually connect some
controllers use `add_controller` and `add_route`. Call
`finalize_config` when all controllers and routes have been added
and `__call__` to handle a request (WSGI style).
"""
self.controllers = dict()
self.api_controllers = dict()
self.mapper = routes.Mapper()
self.clientside_routes = routes.Mapper(controller_scan=None, register=False)
# FIXME: The following two options are deprecated and should be
# removed. Consult the Routes documentation.
self.mapper.minimization = True
self.transaction_factory = DefaultWebTransaction
# Set if trace logging is enabled
self.trace_logger = None
self.session_factories = []
[docs] def add_ui_controller(self, controller_name, controller):
"""
Add a controller class to this application. A controller class has
methods which handle web requests. To connect a URL to a controller's
method use `add_route`.
"""
log.debug("Enabling '%s' controller, class: %s", controller_name, controller.__class__.__name__)
self.controllers[controller_name] = controller
[docs] def add_api_controller(self, controller_name, controller):
log.debug("Enabling '%s' API controller, class: %s", controller_name, controller.__class__.__name__)
self.api_controllers[controller_name] = controller
[docs] def add_route(self, route, **kwargs):
"""
Add a route to match a URL with a method. Accepts all keyword
arguments of `routes.Mapper.connect`. Every route should result in
at least a controller value which corresponds to one of the
objects added with `add_controller`. It optionally may yield an
`action` argument which will be used to locate the method to call
on the controller. Additional arguments will be passed to the
method as keyword args.
"""
self.mapper.connect(route, **kwargs)
[docs] def add_client_route(self, route, controller="root"):
self.clientside_routes.connect(route, controller=controller, action="client")
[docs] def set_transaction_factory(self, transaction_factory):
"""
Use the callable `transaction_factory` to create the transaction
which will be passed to requests.
"""
self.transaction_factory = transaction_factory
[docs] def finalize_config(self):
"""
Call when application is completely configured and ready to serve
requests
"""
# Create/compile the regular expressions for route mapping
self.mapper.create_regs(list(self.controllers.keys()))
self.clientside_routes.create_regs()
[docs] def trace(self, **fields):
if self.trace_logger:
self.trace_logger.log("WebApplication", **fields)
def __call__(self, environ, start_response):
"""
Call interface as specified by WSGI. Wraps the environment in user
friendly objects, finds the appropriate method to handle the request
and calls it.
"""
# Get request_id (set by RequestIDMiddleware):
# Used for logging + ensuring request-scoped SQLAlchemy sessions.
request_id = environ["request_id"]
if self.trace_logger:
self.trace_logger.context_set("request_id", request_id)
self.trace(message="Starting request")
path_info = environ.get("PATH_INFO", "")
try:
for session_factory in self.session_factories:
session_factory.set_request_id(request_id) # Start SQLAlchemy session scope
return self.handle_request(request_id, path_info, environ, start_response)
finally:
for session_factory in self.session_factories:
session_factory.unset_request_id(request_id) # End SQLAlchemy session scope
self.trace(message="Handle request finished")
if self.trace_logger:
self.trace_logger.context_remove("request_id")
def _resolve_map_match(self, map_match, path_info, controllers, use_default=True):
# Get the controller class
controller_name = map_match.pop("controller", None)
controller = controllers.get(controller_name, None)
if controller is None:
raise webob.exc.HTTPNotFound(f"No controller for {path_info}")
# Resolve action method on controller
# This is the easiest way to make the controller/action accessible for
# url_for invocations. Specifically, grids.
action = map_match.pop("action", "index")
method = getattr(controller, action, None)
if method is None and not use_default:
# Skip default, we do this, for example, when we want to fail
# through to another mapper.
raise webob.exc.HTTPNotFound(f"No action for {path_info}")
if method is None:
# no matching method, we try for a default
method = getattr(controller, "default", None)
if method is None:
raise webob.exc.HTTPNotFound(f"No action for {path_info}")
# Is the method exposed
if not getattr(method, "exposed", False):
raise webob.exc.HTTPNotFound(f"Action not exposed for {path_info}")
# Is the method callable
if not callable(method):
raise webob.exc.HTTPNotFound(f"Action not callable for {path_info}")
return (controller_name, controller, action, method)
[docs] def handle_request(self, request_id, path_info, environ, start_response, body_renderer=None):
# Map url using routes
client_match = self.clientside_routes.match(path_info, environ)
map_match = self.mapper.match(path_info, environ) or client_match
if path_info.startswith("/api"):
environ["is_api_request"] = True
controllers = self.api_controllers
else:
environ["is_api_request"] = False
controllers = self.controllers
if map_match is None:
raise webob.exc.HTTPNotFound(f"No route for {path_info}")
self.trace(path_info=path_info, map_match=map_match)
# Setup routes
rc = routes.request_config()
rc.mapper = self.mapper
rc.mapper_dict = map_match
server_port = environ["SERVER_PORT"]
if isinstance(server_port, int):
# Workaround bug in the routes package, which would concatenate this
# without casting to str in
# https://github.com/bbangert/routes/blob/c4d5a5fb693ce8dc7cf5dbc591861acfc49d5c23/routes/__init__.py#L73
environ["SERVER_PORT"] = str(server_port)
rc.environ = environ
# Setup the transaction
trans = self.transaction_factory(environ)
trans.request_id = request_id
rc.redirect = trans.response.send_redirect
# Resolve mapping to controller/method
try:
# We don't use default methods if there's a clientside match for this route.
use_default = client_match is None
controller_name, controller, action, method = self._resolve_map_match(
map_match, path_info, controllers, use_default=use_default
)
except webob.exc.HTTPNotFound:
# Failed, let's check client routes
if not environ["is_api_request"] and client_match is not None:
controller_name, controller, action, method = self._resolve_map_match(
client_match, path_info, controllers
)
else:
raise
trans.controller = controller_name
trans.action = action
environ["controller_action_key"] = (
f"{'api' if environ['is_api_request'] else 'web'}.{controller_name}.{action or 'default'}"
)
# Combine mapper args and query string / form args and call
kwargs = trans.request.params.mixed()
kwargs.update(map_match)
# Special key for AJAX debugging, remove to avoid confusing methods
kwargs.pop("_", None)
try:
body = method(trans, **kwargs)
except Exception as e:
body = self.handle_controller_exception(e, trans, method, **kwargs)
if not body:
trans.response.headers.pop("content-length", None)
raise
body_renderer = body_renderer or self._render_body
return body_renderer(trans, body, environ, start_response)
def _render_body(self, trans, body, environ, start_response):
# Now figure out what we got back and try to get it to the browser in
# a smart way
if callable(body):
# Assume the callable is another WSGI application to run
return body(environ, start_response)
elif isinstance(body, tarfile.ExFileObject):
# Stream the tarfile member back to the browser
body = iterate_file(body)
start_response(trans.response.wsgi_status(), trans.response.wsgi_headeritems())
return body
elif isinstance(body, io.IOBase):
# Stream the file back to the browser
return send_file(start_response, trans, body)
else:
start_response(trans.response.wsgi_status(), trans.response.wsgi_headeritems())
return self.make_body_iterable(trans, body)
[docs] def make_body_iterable(self, trans, body):
if isinstance(body, (types.GeneratorType, list, tuple)):
# Recursively stream the iterable
return flatten(body)
elif body is None:
# Returns an empty body
return []
else:
# Worst case scenario
return [smart_str(body)]
[docs] def handle_controller_exception(self, e, trans, method, **kwargs):
"""
Allow handling of exceptions raised in controller methods.
"""
return False
class WSGIEnvironmentProperty:
"""
Descriptor that delegates a property to a key in the environ member of the
associated object (provides property style access to keys in the WSGI
environment)
"""
def __init__(self, key, default=""):
self.key = key
self.default = default
def __get__(self, obj, type=None):
if obj is None:
return self
return obj.environ.get(self.key, self.default)
class LazyProperty:
"""
Property that replaces itself with a calculated value the first time
it is used.
"""
def __init__(self, func):
self.func = func
def __get__(self, obj, type=None):
if obj is None:
return self
value = self.func(obj)
setattr(obj, self.func.__name__, value)
return value
lazy_property = LazyProperty
[docs]class DefaultWebTransaction:
"""
Wraps the state of a single web transaction (request/response cycle).
TODO: Provide hooks to allow application specific state to be included
in here.
"""
[docs] def __init__(self, environ):
self.environ = environ
self.request = Request(environ)
self.response = Response()
[docs] @lazy_property
def session(self):
"""
Get the user's session state. This is laze since we rarely use it
and the creation/serialization cost is high.
"""
if "com.saddi.service.session" in self.environ:
return self.environ["com.saddi.service.session"].session
elif "beaker.session" in self.environ:
return self.environ["beaker.session"]
else:
return None
def _make_file(self, binary=None):
# For request.params, override cgi.FieldStorage.make_file to create persistent
# tempfiles. Necessary for externalizing the upload tool. It's a little hacky
# but for performance reasons it's way better to use Paste's tempfile than to
# create a new one and copy.
if self._binary_file or self.length >= 0:
return tempfile.NamedTemporaryFile("wb+", delete=False)
else:
return tempfile.NamedTemporaryFile("w+", encoding=self.encoding, newline="\n", delete=False)
def _read_lines(self):
# Always make a new file
self.file = self.make_file()
# Adapt `self.__file = None` to Python name mangling of class-private attributes.
# We need to patch the original FieldStorage class attribute, not the cgi_FieldStorage
# class.
self._FieldStorage__file = None
if self.outerboundary:
self.read_lines_to_outerboundary()
else:
self.read_lines_to_eof()
webob.compat.cgi_FieldStorage.make_file = _make_file
webob.compat.cgi_FieldStorage.read_lines = _read_lines
class Request(webob.Request):
"""
Encapsulates an HTTP request.
"""
def __init__(self, environ):
"""
Create a new request wrapping the WSGI environment `environ`
"""
# self.environ = environ
webob.Request.__init__(self, environ, charset="utf-8")
# Properties that are computed and cached on first use
@lazy_property
def remote_host(self):
try:
return socket.gethostbyname(self.remote_addr)
except OSError:
return self.remote_addr
@lazy_property
def remote_hostname(self):
try:
return socket.gethostbyaddr(self.remote_addr)[0]
except OSError:
return self.remote_addr
@lazy_property
def cookies(self):
cookies = SimpleCookie()
if cookie_header := self.environ.get("HTTP_COOKIE"):
all_cookies = webob.cookies.parse_cookie(cookie_header)
galaxy_cookies = {k.decode(): v.decode() for k, v in all_cookies if k.startswith(b"galaxy")}
if galaxy_cookies:
try:
cookies.load(galaxy_cookies)
except CookieError:
pass
return cookies
@lazy_property
def base(self):
return f"{self.scheme}://{self.host}"
@lazy_property
def url_path(self):
return urljoin(self.base, self.environ.get("SCRIPT_NAME", ""))
# @lazy_property
# def params( self ):
# return parse_formvars( self.environ )
@lazy_property
def path(self):
return self.environ.get("SCRIPT_NAME", "") + self.environ["PATH_INFO"]
@lazy_property
def browser_url(self):
return self.base + self.path
# Descriptors that map properties to the associated environment
# scheme = WSGIEnvironmentProperty( 'wsgi.url_scheme' )
# remote_addr = WSGIEnvironmentProperty( 'REMOTE_ADDR' )
remote_port = WSGIEnvironmentProperty("REMOTE_PORT")
# method = WSGIEnvironmentProperty( 'REQUEST_METHOD' )
# script_name = WSGIEnvironmentProperty( 'SCRIPT_NAME' )
protocol = WSGIEnvironmentProperty("SERVER_PROTOCOL")
# query_string = WSGIEnvironmentProperty( 'QUERY_STRING' )
# path_info = WSGIEnvironmentProperty( 'PATH_INFO' )
class Response:
"""
Describes an HTTP response. Currently very simple since the actual body
of the request is handled separately.
"""
def __init__(self):
"""
Create a new Response defaulting to HTML content and "200 OK" status
"""
self.status = "200 OK"
self.headers = HeaderDict({"content-type": "text/html; charset=UTF-8"})
self.cookies = SimpleCookie()
def set_content_type(self, type_):
"""
Sets the Content-Type header
"""
self.headers["content-type"] = type_
def get_content_type(self):
return self.headers.get("content-type", None)
def send_redirect(self, url):
"""
Send an HTTP redirect response to (target `url`)
"""
if "\n" in url or "\r" in url:
raise webob.exc.HTTPInternalServerError("Invalid redirect URL encountered.")
raise webob.exc.HTTPFound(location=url, headers=self.wsgi_headeritems())
def wsgi_headeritems(self):
"""
Return headers in format appropriate for WSGI `start_response`
"""
result = self.headers.headeritems()
# Add cookie to header
for crumb in self.cookies.values():
header, value = str(crumb).split(": ", 1)
result.append((header, value))
return result
def wsgi_status(self):
"""
Return status line in format appropriate for WSGI `start_response`
"""
if isinstance(self.status, int):
exception = webob.exc.status_map.get(self.status)
return "%d %s" % (exception.code, exception.title)
else:
return self.status
# ---- Utilities ------------------------------------------------------------
CHUNK_SIZE = 2**16
def send_file(start_response, trans, body):
# If configured use X-Accel-Redirect header for nginx
base = trans.app.config.nginx_x_accel_redirect_base
apache_xsendfile = trans.app.config.apache_xsendfile
if base:
trans.response.headers.pop("content-length", None)
trans.response.headers["X-Accel-Redirect"] = base + os.path.abspath(body.name)
body = [b""]
elif apache_xsendfile:
trans.response.headers.pop("content-length", None)
trans.response.headers["X-Sendfile"] = os.path.abspath(body.name)
body = [b""]
# Fall back on sending the file in chunks
else:
trans.response.headers["accept-ranges"] = "bytes"
start = None
end = None
if trans.request.method == "HEAD":
trans.response.headers["content-length"] = os.path.getsize(body.name)
body = b""
if trans.request.range:
start = int(trans.request.range.start)
file_size = int(trans.response.headers["content-length"])
end = int(file_size if end is None else trans.request.range.end)
trans.response.headers["content-length"] = str(end - start)
trans.response.headers["content-range"] = f"bytes {start}-{end - 1}/{file_size}"
trans.response.status = 206
if body:
body = iterate_file(body, start, end)
start_response(trans.response.wsgi_status(), trans.response.wsgi_headeritems())
return body
def iterate_file(fh, start=None, stop=None):
"""
Progressively return chunks from `file`.
"""
length = None
if start:
fh.seek(start)
if stop:
length = stop - start
while 1:
read_size = CHUNK_SIZE
if length:
read_size = min(CHUNK_SIZE, length)
length -= read_size
chunk = fh.read(read_size)
if not chunk:
break
yield chunk
if length is not None and length == 0:
break
def flatten(seq):
"""
Flatten a possible nested set of iterables
"""
for x in seq:
if isinstance(x, (types.GeneratorType, list, tuple)):
for y in flatten(x):
yield smart_str(y)
else:
yield smart_str(x)
[docs]def walk_controller_modules(package_name):
package = import_module(package_name)
controller_dir = package.__path__[0]
for fname in os.listdir(controller_dir):
if not (fname.startswith("_")) and fname.endswith(".py"):
name = fname[:-3]
module_name = f"{package_name}.{name}"
module = import_module(module_name)
yield name, module
__all__ = (
"DefaultWebTransaction",
"httpexceptions",
"lazy_property",
"routes",
"server_starttime",
"walk_controller_modules",
"WebApplication",
)