rpc: refactor way connection object is generated for remote dispatch

Calling a push_privconn method to directly push the connection object
name into the arg list is inconvenient. Refactor so that we acquire
the connection variable name upfront, and push it to the arg list
separately. This allows various hardcoded usage of "priv->conn" to
be parameterized.
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/rpc/gendispatch.pl

@@ -110,19 +110,13 @@ sub name_to_TypeName {
     return $typename;
 }
 
-sub push_privconn {
-    my $args = shift;
-
-    if (!@$args) {
-        if ($structprefix eq "admin") {
-            push(@$args, "priv->dmn");
-        } else {
-            push(@$args, "priv->conn");
-        }
+sub get_conn_arg {
+    if ($structprefix eq "admin") {
+        return "priv->dmn";
     }
+    return "priv->conn";
 }
 
-
 # Read the input file (usually remote_protocol.x) and form an
 # opinion about the name, args and return type of each RPC.
 my ($name, $ProcName, $id, $flags, %calls, @calls, %opts);
@@ -487,6 +481,8 @@ elsif ($mode eq "server") {
         my @free_list = ();
         my @free_list_on_error = ("virNetMessageSaveError(rerr);");
 
+        my $conn = get_conn_arg();
+
         # handle arguments to the function
         if ($argtype ne "void") {
             # node device is special, as it's identified by name
@@ -497,7 +493,7 @@ elsif ($mode eq "server") {
                 $has_node_device = 1;
                 push(@vars_list, "virNodeDevicePtr dev = NULL");
                 push(@getters_list,
-                     "    if (!(dev = virNodeDeviceLookupByName(priv->conn, args->name)))\n" .
+                     "    if (!(dev = virNodeDeviceLookupByName($conn, args->name)))\n" .
                      "        goto cleanup;\n");
                 push(@args_list, "dev");
                 push(@free_list,
@@ -513,7 +509,7 @@ elsif ($mode eq "server") {
 
                     push(@vars_list, "vir${type_name}Ptr $2 = NULL");
                     push(@getters_list,
-                         "    if (!($2 = get_nonnull_$1(priv->conn, args->$2)))\n" .
+                         "    if (!($2 = get_nonnull_$1($conn, args->$2)))\n" .
                          "        goto cleanup;\n");
                     push(@args_list, "$2");
                     push(@free_list,
@@ -522,7 +518,7 @@ elsif ($mode eq "server") {
                     push(@vars_list, "virDomainPtr dom = NULL");
                     push(@vars_list, "virDomainSnapshotPtr snapshot = NULL");
                     push(@getters_list,
-                         "    if (!(dom = get_nonnull_domain(priv->conn, args->${1}.dom)))\n" .
+                         "    if (!(dom = get_nonnull_domain($conn, args->${1}.dom)))\n" .
                          "        goto cleanup;\n" .
                          "\n" .
                          "    if (!(snapshot = get_nonnull_domain_snapshot(dom, args->${1})))\n" .
@@ -532,11 +528,11 @@ elsif ($mode eq "server") {
                          "    virObjectUnref(snapshot);\n" .
                          "    virObjectUnref(dom);");
                 } elsif ($args_member =~ m/^(?:(?:admin|remote)_string|remote_uuid) (\S+)<\S+>;/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
                     push(@args_list, "args->$1.$1_val");
                     push(@args_list, "args->$1.$1_len");
                 } elsif ($args_member =~ m/^(?:opaque|(?:admin|remote)_nonnull_string) (\S+)<\S+>;(.*)$/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
 
                     my $cast = "";
                     my $arg_name = $1;
@@ -553,7 +549,7 @@ elsif ($mode eq "server") {
                     push(@args_list, "${cast}args->$arg_name.${arg_name}_val");
                     push(@args_list, "args->$arg_name.${arg_name}_len");
                 } elsif ($args_member =~ m/^(?:unsigned )?int (\S+)<\S+>;/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
 
                     push(@args_list, "args->$1.$1_val");
                     push(@args_list, "args->$1.$1_len");
@@ -561,7 +557,7 @@ elsif ($mode eq "server") {
                     push(@vars_list, "virTypedParameterPtr $1 = NULL");
                     push(@vars_list, "int n$1 = 0");
                     if ($call->{ProcName} eq "NodeSetMemoryParameters") {
-                        push(@args_list, "priv->conn");
+                        push(@args_list, "$conn");
                     }
                     push(@args_list, "$1");
                     push(@args_list, "n$1");
@@ -576,25 +572,25 @@ elsif ($mode eq "server") {
                     # just make all other array types fail
                     die "unhandled type for argument value: $args_member";
                 } elsif ($args_member =~ m/^remote_uuid (\S+);/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
 
                     push(@args_list, "(unsigned char *) args->$1");
                 } elsif ($args_member =~ m/^(?:admin|remote)_string (\S+);/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
 
                     push(@vars_list, "char *$1");
                     push(@optionals_list, "$1");
                     push(@args_list, "$1");
                 } elsif ($args_member =~ m/^(?:admin|remote)_nonnull_string (\S+);/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
 
                     push(@args_list, "args->$1");
                 } elsif ($args_member =~ m/^(unsigned )?int (\S+);/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
 
                     push(@args_list, "args->$2");
                 } elsif ($args_member =~ m/^(unsigned )?hyper (\S+);/) {
-                    push_privconn(\@args_list);
+                    push(@args_list, $conn) if !@args_list;
 
                     my $arg_name = $2;
 
@@ -613,7 +609,7 @@ elsif ($mode eq "server") {
 
                     push(@vars_list, "virNet${type_name}Ptr $2 = NULL");
                     push(@getters_list,
-                         "    if (!($2 = get_nonnull_$1(priv->dmn, args->$2)))\n" .
+                         "    if (!($2 = get_nonnull_$1($conn, args->$2)))\n" .
                          "        goto cleanup;\n");
                     push(@args_list, "$2");
                     push(@free_list,
@@ -624,7 +620,7 @@ elsif ($mode eq "server") {
                     push(@vars_list, "virNetServerPtr srv = NULL");
                     push(@vars_list, "virNetServer${type_name}Ptr $2 = NULL");
                     push(@getters_list,
-                         "    if (!(srv = get_nonnull_server(priv->dmn, args->$2.srv)))\n" .
+                         "    if (!(srv = get_nonnull_server($conn, args->$2.srv)))\n" .
                          "        goto cleanup;\n");
                     push(@getters_list,
                          "    if (!($2 = get_nonnull_$1(srv, args->$2)))\n" .
@@ -900,7 +896,7 @@ elsif ($mode eq "server") {
         # select struct type for multi-return-value functions
         if ($multi_ret) {
             if (defined $call->{ret_offset}) {
-                push_privconn(\@args_list);
+                push(@args_list, $conn) if !@args_list;
 
                 if ($modern_ret_as_list) {
                     my $struct_name = name_to_TypeName($modern_ret_struct_name);
@@ -999,12 +995,7 @@ elsif ($mode eq "server") {
 
         print "\n";
 
-        if ($structprefix eq "admin") {
-            print "    if (!priv->dmn) {\n";
-        } else {
-            print "    if (!priv->conn) {\n";
-        }
-
+        print "    if (!$conn) {\n";
         print "        virReportError(VIR_ERR_INTERNAL_ERROR, \"%s\", _(\"connection not open\"));\n";
         print "        goto cleanup;\n";
         print "    }\n";
@@ -1034,7 +1025,7 @@ elsif ($mode eq "server") {
         }
 
         if ($call->{streamflag} ne "none") {
-            print "    if (!(st = virStreamNew(priv->conn, VIR_STREAM_NONBLOCK)))\n";
+            print "    if (!(st = virStreamNew($conn, VIR_STREAM_NONBLOCK)))\n";
             print "        goto cleanup;\n";
             print "\n";
             print "    if (!(stream = daemonCreateClientStream(client, st, remoteProgram, &msg->header, sparse)))\n";
@@ -1051,7 +1042,7 @@ elsif ($mode eq "server") {
         } elsif (!$multi_ret) {
             my $proc_name = $call->{ProcName};
 
-            push_privconn(\@args_list);
+            push(@args_list, $conn) if !@args_list;
 
             if ($structprefix eq "qemu" &&
                 $call->{ProcName} =~ /^(Connect)?Domain/) {