Mi save&load command: support and validation

[lttng-tools.git] / src / bin / lttng / commands / load.c

diff --git a/src/bin/lttng/commands/load.c b/src/bin/lttng/commands/load.c
index 347e4ca08896b8507a9e0939c281a0046a946bec..150b880c0e833b839ee60b1e0abaeda723677090 100644 (file)
--- a/src/bin/lttng/commands/load.c
+++ b/src/bin/lttng/commands/load.c
@@ -23,7 +23,9 @@
 #include <string.h>
 #include <assert.h>
 
+#include <common/mi-lttng.h>
 #include <common/config/config.h>
+
 #include "../command.h"
 
 static char *opt_input_path;
@@ -38,6 +40,8 @@ enum {
        OPT_FORCE,
 };
 
+static struct mi_writer *writer;
+
 static struct poptOption load_opts[] = {
        /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
        {"help",        'h',  POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
@@ -65,25 +69,83 @@ static void usage(FILE *ofp)
        fprintf(ofp, "                           before creating new one(s).\n");
 }
 
+static int mi_partial_session(const char *session_name)
+{
+       int ret;
+       assert(writer);
+       assert(session_name);
+
+       /* Open session element */
+       ret = mi_lttng_writer_open_element(writer, config_element_session);
+       if (ret) {
+               goto end;
+       }
+
+       ret = mi_lttng_writer_write_element_string(writer, config_element_name,
+                       session_name);
+       if (ret) {
+               goto end;
+       }
+
+       /* Closing session element */
+       ret = mi_lttng_writer_close_element(writer);
+end:
+       return ret;
+}
+
+/*
+ * Mi print of load command
+ */
+static int mi_load_print(const char *session_name)
+{
+       int ret;
+       assert(writer);
+
+       if (opt_load_all) {
+               /* We use a wildcard to represent all sessions */
+               session_name = "*";
+       }
+
+       /* Print load element */
+       ret = mi_lttng_writer_open_element(writer, mi_lttng_element_load);
+       if (ret) {
+               goto end;
+       }
+
+       /* Print session element */
+       ret = mi_partial_session(session_name);
+       if (ret) {
+               goto end;
+       }
+
+       /* Path element */
+       if (opt_input_path) {
+               ret = mi_lttng_writer_write_element_string(writer, config_element_path,
+                               opt_input_path);
+               if (ret) {
+                       goto end;
+               }
+       }
+
+       /* Close load element */
+       ret = mi_lttng_writer_close_element(writer);
+
+end:
+       return ret;
+}
+
 /*
  * The 'load <options>' first level command
  */
 int cmd_load(int argc, const char **argv)
 {
-       int ret = CMD_SUCCESS;
+       int ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success;
        int opt;
        poptContext pc;
 
        pc = poptGetContext(NULL, argc, argv, load_opts, 0);
        poptReadDefaultConfig(pc, 0);
 
-       /* TODO: mi support */
-       if (lttng_opt_mi) {
-               ret = -LTTNG_ERR_MI_NOT_IMPLEMENTED;
-               ERR("mi option not supported");
-               goto end;
-       }
-
        while ((opt = poptGetNextOpt(pc)) != -1) {
                switch (opt) {
                case OPT_HELP:
@@ -106,13 +168,41 @@ int cmd_load(int argc, const char **argv)
                session_name = poptGetArg(pc);
                if (session_name) {
                        DBG2("Loading session name: %s", session_name);
+               } else {
+                       /* Default to load_all */
+                       opt_load_all = 1;
                }
        }
 
-       ret = config_load_session(opt_input_path, session_name, opt_force, 0);
-       if (ret) {
-               ERR("%s", lttng_strerror(ret));
-               ret = -ret;
+       /* Mi check */
+       if (lttng_opt_mi) {
+               writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
+               if (!writer) {
+                       ret = -LTTNG_ERR_NOMEM;
+                       goto end;
+               }
+
+               /* Open command element */
+               ret = mi_lttng_writer_command_open(writer,
+                               mi_lttng_element_command_load);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
+
+               /* Open output element */
+               ret = mi_lttng_writer_open_element(writer,
+                               mi_lttng_element_command_output);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
+       }
+
+       command_ret = config_load_session(opt_input_path, session_name, opt_force, 0);
+       if (command_ret) {
+               ERR("%s", lttng_strerror(command_ret));
+               success = 0;
        } else {
                if (opt_load_all) {
                        MSG("All sessions have been loaded successfully");
@@ -125,8 +215,49 @@ int cmd_load(int argc, const char **argv)
                } else {
                        MSG("Session has been loaded successfully");
                }
+               success = 1;
+       }
+
+       /* Mi Printing and closing */
+       if (lttng_opt_mi) {
+               /* Mi print */
+               ret = mi_load_print(session_name);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
+
+               /* Close  output element */
+               ret = mi_lttng_writer_close_element(writer);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
+
+               /* Success ? */
+               ret = mi_lttng_writer_write_element_bool(writer,
+                               mi_lttng_element_command_success, success);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
+
+               /* Command element close */
+               ret = mi_lttng_writer_command_close(writer);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
        }
 end:
+       if (writer && mi_lttng_writer_destroy(writer)) {
+               /* Preserve original error code */
+               ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
+       }
+
+       /* Overwrite ret if the was an error with the load command */
+       ret = command_ret ? -command_ret : ret;
+
        poptFreeContext(pc);
        return ret;
 }