Mi start command: support and validation

Signed-off-by: Jonathan Rajotte Julien <jonathan.r.julien@gmail.com>

diff --git a/src/bin/lttng/commands/start.c b/src/bin/lttng/commands/start.c
index 82b3f5f867923dc1c16eaa7eff158331d4f5dc99..5ca92d8d14a87049a743f375c5efaa55bb82e3bc 100644 (file)
--- a/src/bin/lttng/commands/start.c
+++ b/src/bin/lttng/commands/start.c
@@ -24,11 +24,14 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/mi-lttng.h>
+
 #include "../command.h"
 
-#include <common/sessiond-comm/sessiond-comm.h>
 
 static char *opt_session_name;
+static struct mi_writer *writer;
 
 enum {
        OPT_HELP = 1,
@@ -58,6 +61,36 @@ static void usage(FILE *ofp)
        fprintf(ofp, "\n");
 }
 
+static int mi_print_session(char *session_name, int enabled)
+{
+       int ret;
+
+       /* Open session element */
+       ret = mi_lttng_writer_open_element(writer, config_element_session);
+       if (ret) {
+               goto end;
+       }
+
+       /* Print session name element */
+       ret = mi_lttng_writer_write_element_string(writer, config_element_name,
+                       session_name);
+       if (ret) {
+               goto end;
+       }
+
+       ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled,
+                       enabled);
+       if (ret) {
+               goto end;
+       }
+
+       /* Close session element */
+       ret = mi_lttng_writer_close_element(writer);
+
+end:
+       return ret;
+}
+
 /*
  *  start_tracing
  *
@@ -96,6 +129,13 @@ static int start_tracing(void)
        ret = CMD_SUCCESS;
 
        MSG("Tracing started for session %s", session_name);
+       if (lttng_opt_mi) {
+               ret = mi_print_session(session_name, 1);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto free_name;
+               }
+       }
 
 free_name:
        if (opt_session_name == NULL) {
@@ -112,19 +152,12 @@ error:
  */
 int cmd_start(int argc, const char **argv)
 {
-       int opt, ret = CMD_SUCCESS;
+       int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
        static poptContext pc;
 
        pc = poptGetContext(NULL, argc, argv, long_options, 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:
@@ -142,9 +175,81 @@ int cmd_start(int argc, const char **argv)
 
        opt_session_name = (char*) poptGetArg(pc);
 
-       ret = start_tracing();
+       /* 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_start);
+               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;
+               }
+
+               /*
+                * Open sessions element
+                * For validation purpose
+                */
+               ret = mi_lttng_writer_open_element(writer,
+                       config_element_sessions);
+               if (ret) {
+                       ret = CMD_ERROR;
+                       goto end;
+               }
+       }
+
+       command_ret = start_tracing();
+       if (command_ret) {
+               success = 0;
+       }
+
+       /* Mi closing */
+       if (lttng_opt_mi) {
+               /* Close  sessions and output element */
+               ret = mi_lttng_close_multi_element(writer, 2);
+               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:
+       /* Mi clean-up */
+       if (writer && mi_lttng_writer_destroy(writer)) {
+               /* Preserve original error code */
+               ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
+       }
+
+       /* Overwrite ret if an error occurred with start_tracing */
+       ret = command_ret ? command_ret : ret;
        poptFreeContext(pc);
        return ret;
 }

diff --git a/src/common/mi-lttng.c b/src/common/mi-lttng.c
index 12f7030fa6e11f37b7e7ee276fd79f264951eeab..453be4f28f387881b2856a2ffb715afab8f3ddf8 100644 (file)
--- a/src/common/mi-lttng.c
+++ b/src/common/mi-lttng.c
@@ -30,6 +30,7 @@ const char * const mi_lttng_element_command_list = "list";
 const char * const mi_lttng_element_command_save = "save";
 const char * const mi_lttng_element_command_load = "load";
 const char * const mi_lttng_element_command_name = "name";
+const char * const mi_lttng_element_command_start = "start";
 const char * const mi_lttng_element_command_output = "output";
 const char * const mi_lttng_element_command_success = "success";
 

diff --git a/src/common/mi-lttng.h b/src/common/mi-lttng.h
index a7b3006fa79dd4f54be9b9c458f3e85e32d79d7f..7be4a29b9a208e100f0bc1df788887e7f336a793 100644 (file)
--- a/src/common/mi-lttng.h
+++ b/src/common/mi-lttng.h
@@ -52,6 +52,7 @@ const char * const mi_lttng_element_command_list;
 const char * const mi_lttng_element_command_save;
 const char * const mi_lttng_element_command_load;
 const char * const mi_lttng_element_command_name;
+const char * const mi_lttng_element_command_start;
 const char * const mi_lttng_element_command_output;
 const char * const mi_lttng_element_command_success;
 

diff --git a/src/common/mi_lttng.xsd b/src/common/mi_lttng.xsd
index 8aca79f40cd19864f3fd6d6297872d3ca0770f3f..b0649bff064b4b50aae45032fd9d4612e3a68835 100644 (file)
--- a/src/common/mi_lttng.xsd
+++ b/src/common/mi_lttng.xsd
@@ -326,6 +326,7 @@ THE SOFTWARE.
                        <xs:enumeration value="version" />
                        <xs:enumeration value="save" />
                        <xs:enumeration value="load" />
+                       <xs:enumeration value="start" />
                </xs:restriction>
        </xs:simpleType>