add random plugin

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/plugins/random.py b/src/plugins/random.py
new file mode 100644
index 0000000..c942f35
--- /dev/null
+++ b/src/plugins/random.py
@@ -0,0 +1,59 @@
+# -*- python -*-
+'''
+xpybar – xmobar replacement written in python
+Copyright © 2014, 2015  Mattias Andrée (maandree@member.fsf.org)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+'''
+
+
+class Random:
+    '''
+    Entropy pool status
+    
+    @variable  poolsize:int                 The size of the entropy pool, see `man 4 random` for more information
+    @variable  read_wakeup_threshold:int    The number of bits of entropy required for waking up processes
+                                            that sleep waiting for entropy from `/dev/random`
+    @variable  write_wakeup_threshold:int   The number of bits of entropy below which we wake up processes
+                                            that do a `select` or `poll` for write access to `/dev/random`
+    @variable  urandom_min_reseed_secs:int  The minimum number of seconds between urandom pool reseeding
+    @variable  boot_id:int                  Random UUID generated when the system is booted
+    '''
+    
+    
+    def __init__(self):
+        '''
+        Constructor
+        '''
+        def read(filename):
+            with open('/proc/sys/kernel/random/' + filename, 'rb') as file:
+                return file.read().decode('utf-8', 'replace').rstrip('\n')
+        
+        self.poolsize                = int(read('poolsize'))
+        self.read_wakeup_threshold   = int(read('read_wakeup_threshold'))
+        self.write_wakeup_threshold  = int(read('write_wakeup_threshold'))
+        self.urandom_min_reseed_secs = int(read('urandom_min_reseed_secs'))
+        self.boot_id                 =     read('boot_id')
+    
+    
+    def entropy_avail(self):
+        '''
+        Get the number of bits available in the entropy pool.
+        Note that `poolsize` is in bytes on Linux<2.6.
+        
+        @return  :int  The number of bits available in the entropy pool
+        '''
+        with open('/proc/sys/kernel/random/entropy_avail', 'rb') as file:
+            return int(file.read().decode('utf-8', 'replace').rstrip('\n'))
+