+#include <stdlib.h>
+#include <gras.h>
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(test,"My little example");
+
+typedef struct {
+ int done;
+} server_data_t;
+int server_done_cb(gras_msg_cb_ctx_t ctx, void *payload) {
+ server_data_t *globals=(server_data_t*)gras_userdata_get();
+ globals->done = 1;
+ INFO0("Server done");
+
+ return 1;
+} /* end_of_done_callback */
+
+void message_declaration(void) {
+ gras_msgtype_declare_rpc("convert a2i", gras_datadesc_by_name("string"), gras_datadesc_by_name("long"));
+ gras_msgtype_declare_rpc("convert i2a", gras_datadesc_by_name("long"), gras_datadesc_by_name("string"));
+
+ /* the other message allowing the client to stop the server after use */
+ gras_msgtype_declare("done", NULL);
+}
+
+int server_convert_i2a_cb(gras_msg_cb_ctx_t ctx, void *payload) {
+ long data = *(long*)payload;
+ char *result;
+ char *p;
+
+ INFO1("Convert %ld to string",data);
+ result = bprintf("%ld", data);
+ INFO2("%ld converted to string: %s",data,result);
+
+ gras_msg_rpcreturn(60,ctx,&result);
+ free(result);
+ return 1;
+} /* end_of_convert_callback */
+
+int server_convert_a2i_cb(gras_msg_cb_ctx_t ctx, void *payload) {
+ char *string = *(char**)payload;
+ long result;
+ char *p;
+
+ INFO1("Convert %s to long",string);
+ result = strtol(string, &p, 10);
+
+ if (*p != '\0')
+ THROW2(arg_error,0,"Error while converting %s: this does not seem to be a valid number (problem at '%s')",string,p);
+
+ gras_msg_rpcreturn(60,ctx,&result);
+ return 1;
+} /* end_of_convert_callback */
+
+
+int server(int argc, char *argv[]) {
+ gras_socket_t mysock; /* socket on which I listen */
+ server_data_t *globals;
+
+ gras_init(&argc,argv);
+
+ globals=gras_userdata_new(server_data_t*);
+ globals->done=0;
+
+ message_declaration();
+ mysock = gras_socket_server(atoi(argv[1]));
+
+ gras_cb_register(gras_msgtype_by_name("convert a2i"),&server_convert_a2i_cb);
+ gras_cb_register(gras_msgtype_by_name("convert i2a"),&server_convert_i2a_cb);
+ gras_cb_register(gras_msgtype_by_name("done"),&server_done_cb);
+
+ while (!globals->done) {
+ gras_msg_handle(-1); /* blocking */
+ }
+
+ gras_exit();
+ return 0;
+}
+
+int client(int argc, char *argv[]) {
+ gras_socket_t mysock; /* socket on which I listen */
+ gras_socket_t toserver; /* socket used to write to the server */
+
+ gras_init(&argc,argv);
+
+ message_declaration();
+ mysock = gras_socket_server_range(1024, 10000, 0, 0);
+
+ VERB1("Client ready; listening on %d", gras_socket_my_port(mysock));
+
+ gras_os_sleep(1.5); /* sleep 1 second and half */
+ toserver = gras_socket_client(argv[1], atoi(argv[2]));
+
+ long long_to_convert=4321;
+ char *string_result;
+ INFO1("Ask to convert %ld", long_to_convert);
+ gras_msg_rpccall(toserver, 60, gras_msgtype_by_name("convert i2a"), &long_to_convert, &string_result);
+ INFO2("The server says that %ld is equal to \"%s\".", long_to_convert, string_result);
+ free(string_result);
+
+ char *string_to_convert="1234";
+ long long_result;
+ INFO1("Ask to convert %s", string_to_convert);
+ gras_msg_rpccall(toserver, 60, gras_msgtype_by_name("convert a2i"), &string_to_convert, &long_result);
+ INFO2("The server says that \"%s\" is equal to %d.", string_to_convert, long_result);
+
+ xbt_ex_t e;
+ string_to_convert = "azerty";
+ TRY {
+ gras_msg_rpccall(toserver, 60, gras_msgtype_by_name("convert a2i"), &string_to_convert, &long_result);
+ } CATCH(e) {
+ INFO1("The server refuses to convert %s. Here is the received exception:",string_to_convert);
+ xbt_ex_display(&e);
+ INFO0("Again, previous exception was excepted");
+ }
+
+ gras_msg_send(toserver,gras_msgtype_by_name("done"), NULL);
+ INFO0("Stopped the server");
+
+ gras_exit();
+ return 0;
+}
