infohash: add getRandom()

python/opendht.pyx

@@ -70,6 +70,8 @@ cdef extern from "opendht/infohash.h" namespace "dht":
         unsigned commonBits(InfoHash a, InfoHash b)
         @staticmethod
         InfoHash get(string s)
+        @staticmethod
+        InfoHash getRandom()
 
 cdef extern from "opendht/value.h" namespace "dht":
     cdef cppclass Value:
@@ -183,6 +185,11 @@ cdef class PyInfoHash(_WithID):
         h = PyInfoHash()
         h._infohash = InfoHash.get(key.encode())
         return h
+    @staticmethod
+    def getRandom():
+        h = PyInfoHash()
+        h._infohash = InfoHash.getRandom()
+        return h
 
 cdef class PyNode(_WithID):
     cdef shared_ptr[Node] _node

python/tools/benchmark.py

@@ -12,7 +12,7 @@ sys.path.append('..')
 from opendht import *
 
 def random_hash():
-    return PyInfoHash(''.join(random.SystemRandom().choice(string.hexdigits) for _ in range(40)).encode())
+    return PyInfoHash.getRandom()
 
 def start_cluster(i):
     global procs