print data that's a string (best effort) as a string, otw as hex

zktree/templates/zktree/index.html

@@ -19,7 +19,7 @@ <h1>ZooKeeper ZNode {{znode.path}}</h1>
 Path : {{znode.path}}
 <p>
 
-Data : {{znode.data}}
+Data({{znode.datatype}}) : {{znode.data}}
 <p>
 
 </div>

zktree/views.py

@@ -1,13 +1,26 @@
 from django.shortcuts import render_to_response
+import string
 
 from zookeeper_dashboard.zktree.models import ZNode
 
+def istext(s, text_chars="".join(map(chr, range(32, 127))) + "\n\r\t\b"):
+    if "\0" in s: return False
+    if not s: return True
+    t = s.translate(string.maketrans("", ""), text_chars)
+    return len(t) == 0
+
 def index(request, path=""):
     print(path)
     path = "/" + path
     try:
         znode = ZNode(path)
         znode.children.sort()
+        if not istext(znode.data):
+            znode.data = "0x" + "".join(["%d" % (ord(d)) for d in znode.data])
+            znode.datatype = "bin"
+        else:
+            znode.datatype = "str"
+
         return render_to_response('zktree/index.html',
                                   {'znode':znode})
     except Exception as err: