gem: support date format used by OpenVPN 2.5

- smooth fallback

examples/status2_5.v2

@@ -0,0 +1,8 @@
+TITLE,OpenVPN 2.5.1 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on May 14 2021
+TIME,2012-01-01 23:42:00,1238702330
+HEADER,CLIENT_LIST,Common Name,Real Address,Virtual Address,Virtual IPv6 Address,Bytes Received,Bytes Sent,Connected Since,Connected Since (time_t),Username,Client ID,Peer ID,Data Channel Cipher
+CLIENT_LIST,foo,1.2.3.4:1234,192.168.66.2,,11811160064,4194304,2012-01-01 23:42:00,1238702330,UNDEF,1,0,AES-256-GCM
+HEADER,ROUTING_TABLE,Virtual Address,Common Name,Real Address,Last Ref,Last Ref (time_t)
+ROUTING_TABLE,192.168.66.2,foo,1.2.3.4:1234,2012-01-01 23:42:00,1238702330
+GLOBAL_STATS,Max bcast/mcast queue length,42
+END

lib/openvpn-status-web/parser/modern_stateless.rb

@@ -45,6 +45,8 @@ module OpenVPNStatusWeb
 
       private_class_method def self.parse_date(date_string)
         DateTime.strptime(date_string, '%a %b %d %k:%M:%S %Y')
+      rescue Date::Error
+        DateTime.strptime(date_string, '%Y-%m-%d %k:%M:%S')
       end
     end
   end

spec/openvpn-status-web/parser/modern_stateless_spec.rb

@@ -76,4 +76,8 @@ describe OpenVPNStatusWeb::Parser::ModernStateless do
       end
     end
   end
+
+  it 'parses status-version 2 of OpenVPN 2.5' do
+    expect(status_2_5_v2).not_to be_nil
+  end
 end

spec/spec_helper.rb

@@ -16,6 +16,11 @@ def status_v2
   OpenVPNStatusWeb::Parser::V2.new.parse_status_log text
 end
 
+def status_2_5_v2
+  text = File.binread('examples/status2_5.v2')
+  OpenVPNStatusWeb::Parser::V2.new.parse_status_log text
+end
+
 def status_v3
   text = File.binread('examples/status.v3')
   OpenVPNStatusWeb::Parser::V3.new.parse_status_log text