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report_session.py
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report_session.py
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# Copyright 2018-2021 Streamlit Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import sys
import uuid
from enum import Enum
from typing import TYPE_CHECKING
import tornado.gen
import tornado.ioloop
import streamlit.elements.exception as exception_utils
import streamlit.server.server_util as server_util
from streamlit import __version__, config, legacy_caching, secrets, url_util, caching
from streamlit.case_converters import to_snake_case
from streamlit.credentials import Credentials
from streamlit.in_memory_file_manager import in_memory_file_manager
from streamlit.logger import get_logger
from streamlit.metrics_util import Installation
from streamlit.proto.ClientState_pb2 import ClientState
from streamlit.proto.ForwardMsg_pb2 import ForwardMsg
from streamlit.proto.GitInfo_pb2 import GitInfo
from streamlit.proto.NewReport_pb2 import Config, CustomThemeConfig, UserInfo
from streamlit.report import Report
from streamlit.script_request_queue import RerunData, ScriptRequest, ScriptRequestQueue
from streamlit.script_runner import ScriptRunner, ScriptRunnerEvent
from streamlit.storage.file_storage import FileStorage
from streamlit.watcher.local_sources_watcher import LocalSourcesWatcher
LOGGER = get_logger(__name__)
if TYPE_CHECKING:
from streamlit.state.session_state import SessionState
class ReportSessionState(Enum):
REPORT_NOT_RUNNING = "REPORT_NOT_RUNNING"
REPORT_IS_RUNNING = "REPORT_IS_RUNNING"
SHUTDOWN_REQUESTED = "SHUTDOWN_REQUESTED"
class ReportSession(object):
"""
Contains session data for a single "user" of an active report
(that is, a connected browser tab).
Each ReportSession has its own Report, root DeltaGenerator, ScriptRunner,
and widget state.
A ReportSession is attached to each thread involved in running its Report.
"""
def __init__(
self,
ioloop,
script_path,
command_line,
uploaded_file_manager,
message_enqueued_callback,
):
"""Initialize the ReportSession.
Parameters
----------
ioloop : tornado.ioloop.IOLoop
The Tornado IOLoop that we're running within.
script_path : str
Path of the Python file from which this report is generated.
command_line : str
Command line as input by the user.
uploaded_file_manager : UploadedFileManager
The server's UploadedFileManager.
message_enqueued_callback : Callable[[], None]
After enqueuing a message, this callable notification will be invoked.
"""
# Each ReportSession has a unique string ID.
self.id = str(uuid.uuid4())
self._ioloop = ioloop
self._report = Report(script_path, command_line)
self._uploaded_file_mgr = uploaded_file_manager
self._message_enqueued_callback = message_enqueued_callback
self._state = ReportSessionState.REPORT_NOT_RUNNING
# Need to remember the client state here because when a script reruns
# due to the source code changing we need to pass in the previous client state.
self._client_state = ClientState()
# The script should rerun when the `secrets.toml` file has been changed.
secrets._file_change_listener.connect(self._on_secrets_file_changed)
self._local_sources_watcher = LocalSourcesWatcher(
self._report, self._on_source_file_changed
)
self._stop_config_listener = config.on_config_parsed(
self._on_source_file_changed, force_connect=True
)
self._storage = None
self._maybe_reuse_previous_run = False
self._run_on_save = config.get_option("server.runOnSave")
# The ScriptRequestQueue is the means by which we communicate
# with the active ScriptRunner.
self._script_request_queue = ScriptRequestQueue()
self._scriptrunner = None
# This needs to be lazily imported to avoid a dependency cycle.
from streamlit.state.session_state import SessionState
self._session_state = SessionState()
LOGGER.debug("ReportSession initialized (id=%s)", self.id)
def flush_browser_queue(self):
"""Clear the report queue and return the messages it contained.
The Server calls this periodically to deliver new messages
to the browser connected to this report.
Returns
-------
list[ForwardMsg]
The messages that were removed from the queue and should
be delivered to the browser.
"""
return self._report.flush_browser_queue()
def shutdown(self):
"""Shut down the ReportSession.
It's an error to use a ReportSession after it's been shut down.
"""
if self._state != ReportSessionState.SHUTDOWN_REQUESTED:
LOGGER.debug("Shutting down (id=%s)", self.id)
# Clear any unused session files in upload file manager and media
# file manager
self._uploaded_file_mgr.remove_session_files(self.id)
in_memory_file_manager.clear_session_files(self.id)
in_memory_file_manager.del_expired_files()
# Shut down the ScriptRunner, if one is active.
# self._state must not be set to SHUTDOWN_REQUESTED until
# after this is called.
if self._scriptrunner is not None:
self._enqueue_script_request(ScriptRequest.SHUTDOWN)
self._state = ReportSessionState.SHUTDOWN_REQUESTED
self._local_sources_watcher.close()
self._stop_config_listener()
secrets._file_change_listener.disconnect(self._on_secrets_file_changed)
def enqueue(self, msg):
"""Enqueue a new ForwardMsg to our browser queue.
This can be called on both the main thread and a ScriptRunner
run thread.
Parameters
----------
msg : ForwardMsg
The message to enqueue
"""
if not config.get_option("client.displayEnabled"):
return
# Avoid having two maybe_handle_execution_control_request running on
# top of each other when tracer is installed. This leads to a lock
# contention.
if not config.get_option("runner.installTracer"):
# If we have an active ScriptRunner, signal that it can handle an
# execution control request. (Copy the scriptrunner reference to
# avoid it being unset from underneath us, as this function can be
# called outside the main thread.)
scriptrunner = self._scriptrunner
if scriptrunner is not None:
scriptrunner.maybe_handle_execution_control_request()
self._report.enqueue(msg)
self._message_enqueued_callback()
def enqueue_exception(self, e):
"""Enqueue an Exception message.
Parameters
----------
e : BaseException
"""
# This does a few things:
# 1) Clears the current report in the browser.
# 2) Marks the current report as "stopped" in the browser.
# 3) HACK: Resets any script params that may have been broken (e.g. the
# command-line when rerunning with wrong argv[0])
self._on_scriptrunner_event(ScriptRunnerEvent.SCRIPT_STOPPED_WITH_SUCCESS)
self._on_scriptrunner_event(ScriptRunnerEvent.SCRIPT_STARTED)
self._on_scriptrunner_event(ScriptRunnerEvent.SCRIPT_STOPPED_WITH_SUCCESS)
msg = ForwardMsg()
exception_utils.marshall(msg.delta.new_element.exception, e)
self.enqueue(msg)
def request_rerun(self, client_state):
"""Signal that we're interested in running the script.
If the script is not already running, it will be started immediately.
Otherwise, a rerun will be requested.
Parameters
----------
client_state : streamlit.proto.ClientState_pb2.ClientState | None
The ClientState protobuf to run the script with, or None
to use previous client state.
"""
if client_state:
rerun_data = RerunData(
client_state.query_string, client_state.widget_states
)
else:
rerun_data = RerunData()
self._enqueue_script_request(ScriptRequest.RERUN, rerun_data)
self._set_page_config_allowed = True
@property
def session_state(self) -> "SessionState":
return self._session_state
def _on_source_file_changed(self):
"""One of our source files changed. Schedule a rerun if appropriate."""
if self._run_on_save:
self.request_rerun(self._client_state)
else:
self._enqueue_file_change_message()
def _on_secrets_file_changed(self, _):
"""Called when `secrets._file_change_listener` emits a Signal."""
# NOTE: At the time of writing, this function only calls `_on_source_file_changed`.
# The reason behind creating this function instead of just passing `_on_source_file_changed`
# to `connect` / `disconnect` directly is that every function that is passed to `connect` / `disconnect`
# must have at least one argument for `sender` (in this case we don't really care about it, thus `_`),
# and introducing an unnecessary argument to `_on_source_file_changed` just for this purpose sounded finicky.
self._on_source_file_changed()
def _clear_queue(self):
self._report.clear()
def _on_scriptrunner_event(self, event, exception=None, client_state=None):
"""Called when our ScriptRunner emits an event.
This is *not* called on the main thread.
Parameters
----------
event : ScriptRunnerEvent
exception : BaseException | None
An exception thrown during compilation. Set only for the
SCRIPT_STOPPED_WITH_COMPILE_ERROR event.
client_state : streamlit.proto.ClientState_pb2.ClientState | None
The ScriptRunner's final ClientState. Set only for the
SHUTDOWN event.
"""
LOGGER.debug("OnScriptRunnerEvent: %s", event)
prev_state = self._state
if event == ScriptRunnerEvent.SCRIPT_STARTED:
if self._state != ReportSessionState.SHUTDOWN_REQUESTED:
self._state = ReportSessionState.REPORT_IS_RUNNING
if config.get_option("server.liveSave"):
# Enqueue into the IOLoop so it runs without blocking AND runs
# on the main thread.
self._ioloop.spawn_callback(self._save_running_report)
self._clear_queue()
self._enqueue_new_report_message()
elif (
event == ScriptRunnerEvent.SCRIPT_STOPPED_WITH_SUCCESS
or event == ScriptRunnerEvent.SCRIPT_STOPPED_WITH_COMPILE_ERROR
):
if self._state != ReportSessionState.SHUTDOWN_REQUESTED:
self._state = ReportSessionState.REPORT_NOT_RUNNING
script_succeeded = event == ScriptRunnerEvent.SCRIPT_STOPPED_WITH_SUCCESS
self._enqueue_report_finished_message(
ForwardMsg.FINISHED_SUCCESSFULLY
if script_succeeded
else ForwardMsg.FINISHED_WITH_COMPILE_ERROR
)
if config.get_option("server.liveSave"):
# Enqueue into the IOLoop so it runs without blocking AND runs
# on the main thread.
self._ioloop.spawn_callback(self._save_final_report_and_quit)
if script_succeeded:
# When a script completes successfully, we update our
# LocalSourcesWatcher to account for any source code changes
# that change which modules should be watched. (This is run on
# the main thread, because LocalSourcesWatcher is not
# thread safe.)
self._ioloop.spawn_callback(
self._local_sources_watcher.update_watched_modules
)
else:
msg = ForwardMsg()
exception_utils.marshall(
msg.session_event.script_compilation_exception, exception
)
self.enqueue(msg)
elif event == ScriptRunnerEvent.SHUTDOWN:
# When ScriptRunner shuts down, update our local reference to it,
# and check to see if we need to spawn a new one. (This is run on
# the main thread.)
if self._state == ReportSessionState.SHUTDOWN_REQUESTED:
# Only clear media files if the script is done running AND the
# report session is actually shutting down.
in_memory_file_manager.clear_session_files(self.id)
def on_shutdown():
self._client_state = client_state
self._scriptrunner = None
# Because a new ScriptEvent could have been enqueued while the
# scriptrunner was shutting down, we check to see if we should
# create a new one. (Otherwise, a newly-enqueued ScriptEvent
# won't be processed until another event is enqueued.)
self._maybe_create_scriptrunner()
self._ioloop.spawn_callback(on_shutdown)
# Send a message if our run state changed
report_was_running = prev_state == ReportSessionState.REPORT_IS_RUNNING
report_is_running = self._state == ReportSessionState.REPORT_IS_RUNNING
if report_is_running != report_was_running:
self._enqueue_session_state_changed_message()
def _enqueue_session_state_changed_message(self):
msg = ForwardMsg()
msg.session_state_changed.run_on_save = self._run_on_save
msg.session_state_changed.report_is_running = (
self._state == ReportSessionState.REPORT_IS_RUNNING
)
self.enqueue(msg)
def _enqueue_file_change_message(self):
LOGGER.debug("Enqueuing report_changed message (id=%s)", self.id)
msg = ForwardMsg()
msg.session_event.report_changed_on_disk = True
self.enqueue(msg)
def _enqueue_new_report_message(self):
self._report.generate_new_id()
msg = ForwardMsg()
msg.new_report.report_id = self._report.report_id
msg.new_report.name = self._report.name
msg.new_report.script_path = self._report.script_path
_populate_config_msg(msg.new_report.config)
_populate_theme_msg(msg.new_report.custom_theme)
# Immutable session data. We send this every time a new report is
# started, to avoid having to track whether the client has already
# received it. It does not change from run to run; it's up to the
# to perform one-time initialization only once.
imsg = msg.new_report.initialize
_populate_user_info_msg(imsg.user_info)
imsg.environment_info.streamlit_version = __version__
imsg.environment_info.python_version = ".".join(map(str, sys.version_info))
imsg.session_state.run_on_save = self._run_on_save
imsg.session_state.report_is_running = (
self._state == ReportSessionState.REPORT_IS_RUNNING
)
imsg.command_line = self._report.command_line
imsg.session_id = self.id
self.enqueue(msg)
def _enqueue_report_finished_message(self, status):
"""Enqueue a report_finished ForwardMsg.
Parameters
----------
status : ReportFinishedStatus
"""
msg = ForwardMsg()
msg.report_finished = status
self.enqueue(msg)
def handle_git_information_request(self):
msg = ForwardMsg()
try:
from streamlit.git_util import GitRepo
repo = GitRepo(self._report.script_path)
repo_info = repo.get_repo_info()
if repo_info is None:
return
repository_name, branch, module = repo_info
msg.git_info_changed.repository = repository_name
msg.git_info_changed.branch = branch
msg.git_info_changed.module = module
msg.git_info_changed.untracked_files[:] = repo.untracked_files
msg.git_info_changed.uncommitted_files[:] = repo.uncommitted_files
if repo.is_head_detached:
msg.git_info_changed.state = GitInfo.GitStates.HEAD_DETACHED
elif len(repo.ahead_commits) > 0:
msg.git_info_changed.state = GitInfo.GitStates.AHEAD_OF_REMOTE
else:
msg.git_info_changed.state = GitInfo.GitStates.DEFAULT
self.enqueue(msg)
except Exception as e:
# Users may never even install Git in the first place, so this
# error requires no action. It can be useful for debugging.
LOGGER.debug("Obtaining Git information produced an error", exc_info=e)
def handle_rerun_script_request(self, client_state=None, is_preheat=False):
"""Tell the ScriptRunner to re-run its report.
Parameters
----------
client_state : streamlit.proto.ClientState_pb2.ClientState | None
The ClientState protobuf to run the script with, or None
to use previous client state.
is_preheat: boolean
True if this ReportSession should run the script immediately, and
then ignore the next rerun request if it matches the already-ran
widget state.
"""
if is_preheat:
self._maybe_reuse_previous_run = True # For next time.
elif self._maybe_reuse_previous_run:
# If this is a "preheated" ReportSession, reuse the previous run if
# the widget state matches. But only do this one time ever.
self._maybe_reuse_previous_run = False
has_client_state = False
if client_state is not None:
has_query_string = client_state.query_string != ""
has_widget_states = (
client_state.widget_states is not None
and len(client_state.widget_states.widgets) > 0
)
has_client_state = has_query_string or has_widget_states
if not has_client_state:
LOGGER.debug("Skipping rerun since the preheated run is the same")
return
self.request_rerun(client_state)
def handle_stop_script_request(self):
"""Tell the ScriptRunner to stop running its report."""
self._enqueue_script_request(ScriptRequest.STOP)
def handle_clear_cache_request(self):
"""Clear this report's cache.
Because this cache is global, it will be cleared for all users.
"""
legacy_caching.clear_cache()
caching.clear_memo_cache()
caching.clear_singleton_cache()
self._session_state.clear_state()
def handle_set_run_on_save_request(self, new_value):
"""Change our run_on_save flag to the given value.
The browser will be notified of the change.
Parameters
----------
new_value : bool
New run_on_save value
"""
self._run_on_save = new_value
self._enqueue_session_state_changed_message()
def _enqueue_script_request(self, request, data=None):
"""Enqueue a ScriptEvent into our ScriptEventQueue.
If a script thread is not already running, one will be created
to handle the event.
Parameters
----------
request : ScriptRequest
The type of request.
data : Any
Data associated with the request, if any.
"""
if self._state == ReportSessionState.SHUTDOWN_REQUESTED:
LOGGER.warning("Discarding %s request after shutdown" % request)
return
self._script_request_queue.enqueue(request, data)
self._maybe_create_scriptrunner()
def _maybe_create_scriptrunner(self):
"""Create a new ScriptRunner if we have unprocessed script requests.
This is called every time a ScriptRequest is enqueued, and also
after a ScriptRunner shuts down, in case new requests were enqueued
during its termination.
This function should only be called on the main thread.
"""
if (
self._state == ReportSessionState.SHUTDOWN_REQUESTED
or self._scriptrunner is not None
or not self._script_request_queue.has_request
):
return
# Create the ScriptRunner, attach event handlers, and start it
self._scriptrunner = ScriptRunner(
session_id=self.id,
report=self._report,
enqueue_forward_msg=self.enqueue,
client_state=self._client_state,
request_queue=self._script_request_queue,
session_state=self._session_state,
uploaded_file_mgr=self._uploaded_file_mgr,
)
self._scriptrunner.on_event.connect(self._on_scriptrunner_event)
self._scriptrunner.start()
@tornado.gen.coroutine
def handle_save_request(self, ws):
"""Save serialized version of report deltas to the cloud.
"Progress" ForwardMsgs will be sent to the client during the upload.
These messages are sent "out of band" - that is, they don't get
enqueued into the ReportQueue (because they're not part of the report).
Instead, they're written directly to the report's WebSocket.
Parameters
----------
ws : _BrowserWebSocketHandler
The report's websocket handler.
"""
@tornado.gen.coroutine
def progress(percent):
progress_msg = ForwardMsg()
progress_msg.upload_report_progress = percent
yield ws.write_message(
server_util.serialize_forward_msg(progress_msg), binary=True
)
# Indicate that the save is starting.
try:
yield progress(0)
url = yield self._save_final_report(progress)
# Indicate that the save is done.
progress_msg = ForwardMsg()
progress_msg.report_uploaded = url
yield ws.write_message(
server_util.serialize_forward_msg(progress_msg), binary=True
)
except Exception as e:
# Horrible hack to show something if something breaks.
err_msg = "%s: %s" % (type(e).__name__, str(e) or "No further details.")
progress_msg = ForwardMsg()
progress_msg.report_uploaded = err_msg
yield ws.write_message(
server_util.serialize_forward_msg(progress_msg), binary=True
)
LOGGER.warning("Failed to save report:", exc_info=e)
@tornado.gen.coroutine
def _save_running_report(self):
files = self._report.serialize_running_report_to_files()
url = yield self._get_storage().save_report_files(self._report.report_id, files)
if config.get_option("server.liveSave"):
url_util.print_url("Saved running app", url)
raise tornado.gen.Return(url)
@tornado.gen.coroutine
def _save_final_report(self, progress_coroutine=None):
files = self._report.serialize_final_report_to_files()
url = yield self._get_storage().save_report_files(
self._report.report_id, files, progress_coroutine
)
if config.get_option("server.liveSave"):
url_util.print_url("Saved final app", url)
raise tornado.gen.Return(url)
@tornado.gen.coroutine
def _save_final_report_and_quit(self):
yield self._save_final_report()
self._ioloop.stop()
def _get_storage(self):
if self._storage is None:
sharing_mode = config.get_option("global.sharingMode")
if sharing_mode == "s3":
from streamlit.storage.s3_storage import S3Storage
self._storage = S3Storage()
elif sharing_mode == "file":
self._storage = FileStorage()
else:
raise RuntimeError("Unsupported sharing mode '%s'" % sharing_mode)
return self._storage
def _populate_config_msg(msg: Config) -> None:
msg.sharing_enabled = config.get_option("global.sharingMode") != "off"
msg.gather_usage_stats = config.get_option("browser.gatherUsageStats")
msg.max_cached_message_age = config.get_option("global.maxCachedMessageAge")
msg.mapbox_token = config.get_option("mapbox.token")
msg.allow_run_on_save = config.get_option("server.allowRunOnSave")
def _populate_theme_msg(msg: CustomThemeConfig) -> None:
enum_encoded_options = {"base", "font"}
theme_opts = config.get_options_for_section("theme")
if not any(theme_opts.values()):
return
for option_name, option_val in theme_opts.items():
if option_name not in enum_encoded_options and option_val is not None:
setattr(msg, to_snake_case(option_name), option_val)
# NOTE: If unset, base and font will default to the protobuf enum zero
# values, which are BaseTheme.LIGHT and FontFamily.SANS_SERIF,
# respectively. This is why we both don't handle the cases explicitly and
# also only log a warning when receiving invalid base/font options.
base_map = {
"light": msg.BaseTheme.LIGHT,
"dark": msg.BaseTheme.DARK,
}
base = theme_opts["base"]
if base is not None:
if base not in base_map:
LOGGER.warning(
f'"{base}" is an invalid value for theme.base.'
f" Allowed values include {list(base_map.keys())}."
' Setting theme.base to "light".'
)
else:
msg.base = base_map[base]
font_map = {
"sans serif": msg.FontFamily.SANS_SERIF,
"serif": msg.FontFamily.SERIF,
"monospace": msg.FontFamily.MONOSPACE,
}
font = theme_opts["font"]
if font is not None:
if font not in font_map:
LOGGER.warning(
f'"{font}" is an invalid value for theme.font.'
f" Allowed values include {list(font_map.keys())}."
' Setting theme.font to "sans serif".'
)
else:
msg.font = font_map[font]
def _populate_user_info_msg(msg: UserInfo) -> None:
msg.installation_id = Installation.instance().installation_id
msg.installation_id_v1 = Installation.instance().installation_id_v1
msg.installation_id_v2 = Installation.instance().installation_id_v2
msg.installation_id_v3 = Installation.instance().installation_id_v3
if Credentials.get_current().activation:
msg.email = Credentials.get_current().activation.email
else:
msg.email = ""