geo-rep: Detailed JSON output for config

JSON output of `config-get` command now returns in the following
format

    {
        "name": CONFIG_NAME,
        "value": CONFIG_VALUE,
        "default_value": DEFAULT_VALUE,  # Only if modified == true
        "configurable": true|false,
        "modified": true|false
    }

Change-Id: I6193de48cd33655df7ecef5a0d83d7cb147089cf
Fixes: #361
Signed-off-by: Aravinda VK <avishwan@redhat.com>

geo-replication/gsyncd.conf.in

@@ -16,10 +16,12 @@ configurable=false
 [master-replica-count]
 configurable=false
 type=int
+value=1
 
-[master-disperse_count]
+[master-disperse-count]
 configurable=false
 type=int
+value=1
 
 [glusterd-workdir]
 value = @GLUSTERD_WORKDIR@

geo-replication/syncdaemon/gsyncdconfig.py

@@ -36,6 +36,8 @@ class Gconf(object):
         self.args = args
         self.extra_tmpl_args = extra_tmpl_args
         self.override_from_args = override_from_args
+        # Store default values only if overwriten, Only for JSON/CLI output
+        self.default_values = {}
         self._load()
 
     def _tmpl_substitute(self):
@@ -63,6 +65,8 @@ class Gconf(object):
                 "to_" + self.gconf_typecast.get(k, "string"), None)
             if cast_func is not None:
                 self.gconf[k] = cast_func(v)
+                if self.default_values.get(k, None) is not None:
+                    self.default_values[k] = cast_func(v)
 
     def reset(self, name):
         # If custom conf file is not set then it is only read only configs
@@ -150,6 +154,7 @@ class Gconf(object):
         self.gconf_typecast = {}
         self.non_configurable_configs = []
         self.session_conf_items = []
+        self.default_values = {}
 
         conf = ConfigParser()
         # Default Template config file
@@ -196,6 +201,7 @@ class Gconf(object):
         if conf.has_section("vars"):
             for k, v in conf.items("vars"):
                 self.session_conf_items.append(k)
+                self.default_values[k] = self.gconf.get(k, "")
                 self.gconf[k] = v.strip()
 
         # Overwrite the Slave configurations which are sent as
@@ -221,17 +227,36 @@ class Gconf(object):
         if not show_defaults:
             for k in self.session_conf_items:
                 if k not in self.non_configurable_configs:
-                    cnf[k] = self.get(k)
-
+                    dv = self.default_values.get(k, "")
+                    cnf[k] = {
+                        "value": self.get(k),
+                        "default": dv,
+                        "configurable": True,
+                        "modified": False if dv == "" else True
+                    }
             return cnf
 
         # Show all configs including defaults
         for k, v in self.gconf.items():
+            configurable = False if k in self.non_configurable_configs \
+                           else True
+            dv = self.default_values.get(k, "")
+            modified = False if dv == "" else True
             if show_non_configurable:
-                cnf[k] = v
+                cnf[k] = {
+                    "value": v,
+                    "default": dv,
+                    "configurable": configurable,
+                    "modified": modified
+                }
             else:
                 if k not in self.non_configurable_configs:
-                    cnf[k] = v
+                    cnf[k] = {
+                        "value": v,
+                        "default": dv,
+                        "configurable": configurable,
+                        "modified": modified
+                    }
 
         return cnf
 

geo-replication/syncdaemon/subcmds.py

@@ -243,21 +243,29 @@ def subcmd_config_get(args):
             sys.stderr.write("Invalid config name \"%s\"\n" % args.name)
             sys.exit(ERROR_CONFIG_INVALID)
 
-        print_config(args.name, val, only_value=args.only_value,
+        print_config(args.name, val["value"], only_value=args.only_value,
                      use_underscore=args.use_underscore)
         return
 
     if args.json:
-        out = {}
+        out = []
         # Convert all values as string
-        for k, v in all_config.items():
-            out[k] = str(v)
+        for k in sorted(all_config):
+            v = all_config[k]
+            out.append({
+                "name": k,
+                "value": str(v["value"]),
+                "default": str(v["default"]),
+                "configurable": v["configurable"],
+                "modified": v["modified"]
+            })
 
         print(json.dumps(out))
         return
 
     for k in sorted(all_config):
-        print_config(k, all_config[k], use_underscore=args.use_underscore)
+        print_config(k, all_config[k]["value"],
+                     use_underscore=args.use_underscore)
 
 
 def subcmd_config_check(args):