[IMP] doc/backend: add example for JSON-RPC interaction

doc/howtos/backend.rst

@@ -1682,15 +1682,13 @@ XML-RPC Library
 ---------------
 
 The following example is a Python program that interacts with an Odoo
-server with the library xmlrpclib.
-
-::
+server with the library ``xmlrpclib``::
 
    import xmlrpclib
 
    root = 'http://%s:%d/xmlrpc/' % (HOST, PORT)
 
-   uid = xmlrpclib.ServerProxy(root + 'common').login(db, username, password)
+   uid = xmlrpclib.ServerProxy(root + 'common').login(DB, USER, PASS)
    print "Logged in as %s (uid: %d)" % (USER, uid)
 
    # Create a new idea
@@ -1700,7 +1698,7 @@ server with the library xmlrpclib.
        'description' : 'This is another idea of mine',
        'inventor_id': uid,
    }
-   idea_id = sock.execute(db, uid, password, 'idea.idea', 'create', args)
+   idea_id = sock.execute(DB, uid, PASS, 'idea.idea', 'create', args)
 
 .. exercise:: Add a new service to the client
 
@@ -1750,8 +1748,52 @@ server with the library xmlrpclib.
                 'course_id' : course_id,
             })
 
-.. note:: there are also a number of high-level APIs in various languages to
-          access Odoo systems without *explicitly* going through XML-RPC e.g.
+JSON-RPC Library
+----------------
+
+The following example is a Python program that interacts with an Odoo server
+with the libraries ``urllib2`` and ``json``::
+
+    import json
+    import random
+    import urllib2
+
+    def json_rpc(url, method, params):
+        data = {
+            "jsonrpc": "2.0",
+            "method": method,
+            "params": params,
+            "id": random.randint(0, 1000000000),
+        }
+        req = urllib2.Request(url=url, data=json.dumps(data), headers={
+            "Content-Type":"application/json",
+        })
+        reply = json.load(urllib2.urlopen(req))
+        if reply.get("error"):
+            raise Exception(reply["error"])
+        return reply["result"]
+
+    def call(url, service, method, *args):
+        return json_rpc(url, "call", {"service": service, "method": method, "args": args})
+
+    # log in the given database
+    url = "http://%s:%s/jsonrpc" % (HOST, PORT)
+    uid = call(url, "common", "login", DB, USER, PASS)
+
+    # create a new idea
+    args = {
+        'name' : 'Another idea',
+        'description' : 'This is another idea of mine',
+        'inventor_id': uid,
+    }
+    idea_id = call(url, "object", "execute", DB, uid, PASS, 'idea.idea', 'create', args)
+
+Examples can be easily adapted from XML-RPC to JSON-RPC.
+
+.. note::
+
+    There are a number of high-level APIs in various languages to access Odoo
+    systems without *explicitly* going through XML-RPC or JSON-RPC, such as:
 
     * https://github.com/akretion/ooor
     * https://github.com/syleam/openobject-library