lnt: profile queries

Upstream changed LNT a while ago to store the demangled named for C++ functions.

The issue is that the demangled named contain characters that are invalid for HTTP URIs.
For instance the & character.  URI encode doesn't work because of this.  The function can contain invalid characters for URIs.

To work around this I base64 encode the function name and decode it at the other side.  This enabled us to view all profile info again.

Change-Id: I9386a27be8f80ff8cbc21d2ec3ea0de781f6244a

Author: TamarChristinaArm

lnt/server/ui/profile_views.py

@@ -3,6 +3,7 @@
 from sqlalchemy.orm.exc import NoResultFound
 
 from flask import render_template, current_app
+import base64
 import os
 import json
 from lnt.server.ui.decorators import v4_route, frontend
@@ -108,7 +109,8 @@ def v4_profile_ajax_getCodeForFunction():
     ts = request.get_testsuite()
     runid = request.args.get('runid')
     testid = request.args.get('testid')
-    f = request.args.get('f')
+    f_enc = request.args.get('f')
+    f = base64.b64decode(f_enc)
 
     profileDir = current_app.old_config.profileDir
 

lnt/server/ui/static/lnt_profile.js

@@ -470,12 +470,13 @@ Profile.prototype = {
     },
 
     _fetch_and_display: function(fname, then) {
-        this.function_name = fname;
+        fname_encoded = btoa (fname)
+        this.function_name = fname_encoded;
         var this_ = this;
         $.ajax(g_urls.getCodeForFunction, {
             dataType: "json",
             data: {'runid': this.runid, 'testid': this.testid,
-                   'f': fname},
+                   'f': fname_encoded},
             success: function(data) {
                 this_.data = data;
                 this_._display();