Replace the logging gem with stdlib logger

lib/ews/connection.rb

@@ -39,7 +39,7 @@ class Connection
       # @option opts [Array]  :trust_ca an array of hashed dir paths or a file
       # @option opts [String] :user_agent the http user agent to use in all requests
       def initialize(endpoint, opts = {})
-        @log = Logging.logger[self.class.name.to_s.to_sym]
+        @log = Viewpoint::EWS.root_logger
 
         httpclient_opts = opts.slice(*SUPPORTED_HTTPCLIENT_OPTS)
         @httpcli = HTTPClient.new(**httpclient_opts)

lib/ews/connection_helper.rb

@@ -21,7 +21,7 @@ module EWS
     # Helpers for building authenticated HTTP connections.
     module ConnectionHelper
       def init_logging!
-        @log = Logging.logger[self.class.name.to_s.to_sym]
+        @log = Viewpoint::EWS.root_logger
       end
 
       # @param [String] xml to parse the errors from.

lib/ews/soap.rb

@@ -57,7 +57,7 @@ module SOAP
       MOVE_TO_DELETED_ITEMS = 'MoveToDeletedItems'
 
       def initialize
-        @log = Logging.logger[self.class.name.to_s.to_sym]
+        @log = Viewpoint::EWS.root_logger
         @default_ns = NAMESPACES["xmlns:#{NS_EWS_MESSAGES}"]
       end
     end

lib/viewpoint.rb

@@ -21,7 +21,7 @@
 require 'base64'
 require 'nokogiri'
 require 'ostruct'
-require 'logging'
+require 'logger' unless defined?(Logger)
 
 # String utilities
 require 'viewpoint/string_utils'

lib/viewpoint/logging.rb

@@ -16,13 +16,18 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 
+require 'logger' unless defined?(Logger)
+
 module Viewpoint
   # Exchange Web Services (EWS) client namespace.
   module EWS
     attr_reader :logger
 
+    @root_logger = Logger.new($stdout)
+    @root_logger.level = Logger::WARN
+
     def self.root_logger
-      Logging.logger.root
+      @root_logger
     end
   end
 end

lib/viewpoint/logging/config.rb

@@ -19,7 +19,6 @@
 module Viewpoint
   # Exchange Web Services (EWS) client namespace.
   module EWS
-    Logging.logger.root.level = :debug
-    Logging.logger.root.appenders = Logging.appenders.stdout
+    root_logger.level = Logger::DEBUG
   end
 end

viewpoint.gemspec

@@ -26,7 +26,8 @@ Gem::Specification.new do |s|
   s.extra_rdoc_files = %w[README.md]
 
   s.add_runtime_dependency  'httpclient'
-  s.add_runtime_dependency  'logging'
+  # logger is no longer a bundled gem on Ruby 4.0
+  s.add_runtime_dependency  'logger'
   s.add_runtime_dependency  'mutex_m'
   s.add_runtime_dependency  'nokogiri', '!=1.12.3', '!=1.12.2', '!=1.12.1', '!=1.12.0'
   s.add_runtime_dependency  'rubyntlm'