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callbacks.py
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callbacks.py
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import logging
import sys
from tabpy.tabpy_server.app.SettingsParameters import SettingsParameters
from tabpy.tabpy_server.common.messages import (
LoadObject,
DeleteObjects,
ListObjects,
ObjectList,
)
from tabpy.tabpy_server.common.endpoint_file_mgr import cleanup_endpoint_files
from tabpy.tabpy_server.common.util import format_exception
from tabpy.tabpy_server.management.state import TabPyState, get_query_object_path
from tabpy.tabpy_server.management import util
from time import sleep
from tornado import gen
logger = logging.getLogger(__name__)
def wait_for_endpoint_loaded(python_service, object_uri):
"""
This method waits for the object to be loaded.
"""
logger.info("Waiting for object to be loaded...")
while True:
msg = ListObjects()
list_object_msg = python_service.manage_request(msg)
if not isinstance(list_object_msg, ObjectList):
logger.error(f"Error loading endpoint {object_uri}: {list_object_msg}")
return
for (uri, info) in list_object_msg.objects.items():
if uri == object_uri:
if info["status"] != "LoadInProgress":
logger.info(f'Object load status: {info["status"]}')
return
sleep(0.1)
@gen.coroutine
def init_ps_server(settings, tabpy_state):
logger.info("Initializing TabPy Server...")
existing_pos = tabpy_state.get_endpoints()
for (object_name, obj_info) in existing_pos.items():
try:
object_version = obj_info["version"]
get_query_object_path(
settings[SettingsParameters.StateFilePath], object_name, object_version
)
except Exception as e:
logger.error(
f"Exception encounted when downloading object: {object_name}"
f", error: {e}"
)
@gen.coroutine
def init_model_evaluator(settings, tabpy_state, python_service):
"""
This will go through all models that the service currently have and
initialize them.
"""
logger.info("Initializing models...")
existing_pos = tabpy_state.get_endpoints()
for (object_name, obj_info) in existing_pos.items():
object_version = obj_info["version"]
object_type = obj_info["type"]
object_path = get_query_object_path(
settings[SettingsParameters.StateFilePath], object_name, object_version
)
logger.info(
f"Load endpoint: {object_name}, "
f"version: {object_version}, "
f"type: {object_type}"
)
if object_type == "alias":
msg = LoadObject(
object_name, obj_info["target"], object_version, False, "alias"
)
else:
local_path = object_path
msg = LoadObject(
object_name, local_path, object_version, False, object_type
)
python_service.manage_request(msg)
def _get_latest_service_state(settings, tabpy_state, new_ps_state, python_service):
"""
Update the endpoints from the latest remote state file.
Returns
--------
(has_changes, endpoint_diff):
has_changes: True or False
endpoint_diff: Summary of what has changed, one entry for each changes
"""
# Shortcut when nothing is changed
changes = {"endpoints": {}}
# update endpoints
new_endpoints = new_ps_state.get_endpoints()
diff = {}
current_endpoints = python_service.ps.query_objects
for (endpoint_name, endpoint_info) in new_endpoints.items():
existing_endpoint = current_endpoints.get(endpoint_name)
if (existing_endpoint is None) or endpoint_info["version"] != existing_endpoint[
"version"
]:
# Either a new endpoint or new endpoint version
path_to_new_version = get_query_object_path(
settings[SettingsParameters.StateFilePath],
endpoint_name,
endpoint_info["version"],
)
endpoint_type = endpoint_info.get("type", "model")
diff[endpoint_name] = (
endpoint_type,
endpoint_info["version"],
path_to_new_version,
)
# add removed models too
for (endpoint_name, endpoint_info) in current_endpoints.items():
if endpoint_name not in new_endpoints.keys():
endpoint_type = current_endpoints[endpoint_name].get("type", "model")
diff[endpoint_name] = (endpoint_type, None, None)
if diff:
changes["endpoints"] = diff
tabpy_state = new_ps_state
return (True, changes)
@gen.coroutine
def on_state_change(
settings, tabpy_state, python_service, logger=logging.getLogger(__name__)
):
try:
logger.log(logging.INFO, "Loading state from state file")
config = util._get_state_from_file(
settings[SettingsParameters.StateFilePath], logger=logger
)
new_ps_state = TabPyState(config=config, settings=settings)
(has_changes, changes) = _get_latest_service_state(
settings, tabpy_state, new_ps_state, python_service
)
if not has_changes:
logger.info("Nothing changed, return.")
return
new_endpoints = new_ps_state.get_endpoints()
for object_name in changes["endpoints"]:
(object_type, object_version, object_path) = changes["endpoints"][
object_name
]
if not object_path and not object_version: # removal
logger.info(f"Removing object: URI={object_name}")
python_service.manage_request(DeleteObjects([object_name]))
cleanup_endpoint_files(
object_name, settings[SettingsParameters.UploadDir], logger=logger
)
else:
endpoint_info = new_endpoints[object_name]
is_update = object_version > 1
if object_type == "alias":
msg = LoadObject(
object_name,
endpoint_info["target"],
object_version,
is_update,
"alias",
)
else:
local_path = object_path
msg = LoadObject(
object_name, local_path, object_version, is_update, object_type
)
python_service.manage_request(msg)
wait_for_endpoint_loaded(python_service, object_name)
# cleanup old version of endpoint files
if object_version > 2:
cleanup_endpoint_files(
object_name,
settings[SettingsParameters.UploadDir],
logger=logger,
retain_versions=[object_version, object_version - 1],
)
except Exception as e:
err_msg = format_exception(e, "on_state_change")
logger.log(
logging.ERROR, f"Error submitting update model request: error={err_msg}"
)