perf: random memory optimizations (#36102)

* perf: preload mysqlclient

Now the default choice instead of PyMySQL.

* perf: Lazy load JWT

OAuth is not used that frequently, on that many sites.

* perf: Lazy load whoosh

Rarely loaded

frappe/app.py

@@ -48,7 +48,7 @@ import frappe.boot
 import frappe.client
 import frappe.core.doctype.file.file
 import frappe.core.doctype.user.user
-import frappe.database.mariadb.database  # Load database related utils
+import frappe.database.mariadb.mysqlclient  # Load database related utils
 import frappe.database.query
 import frappe.desk.desktop  # workspace
 import frappe.desk.form.save

frappe/oauth.py

@@ -5,7 +5,6 @@ import re
 from http import cookies
 from urllib.parse import unquote, urljoin, urlparse
 
-import jwt
 from oauthlib.openid import RequestValidator
 
 import frappe
@@ -302,6 +301,8 @@ class OAuthWebRequestValidator(RequestValidator):
 	# OpenID Connect
 
 	def finalize_id_token(self, id_token, token, token_handler, request):
+		import jwt
+
 		# Check whether frappe server URL is set
 		id_token_header = {"typ": "jwt", "alg": "HS256"}
 
@@ -437,6 +438,8 @@ class OAuthWebRequestValidator(RequestValidator):
 		- OpenIDConnectImplicit
 		- OpenIDConnectHybrid
 		"""
+		import jwt
+
 		if id_token_hint:
 			try:
 				user = None

frappe/search/__init__.py

@@ -2,14 +2,13 @@
 # License: MIT. See LICENSE
 
 import frappe
-from frappe.search.full_text_search import FullTextSearch
-from frappe.search.sqlite_search import SQLiteSearch
-from frappe.search.website_search import WebsiteSearch
 from frappe.utils import cint
 
 
 @frappe.whitelist(allow_guest=True)
 def web_search(query, scope=None, limit=20):
+	from frappe.search.website_search import WebsiteSearch
+
 	limit = cint(limit)
 	ws = WebsiteSearch(index_name="web_routes")
 	return ws.search(query, scope, limit)