snapshot/eventsapi: Integrate snapshot events with eventsapi

    Backport of http://review.gluster.org/#/c/15329/

1. EVENT_SNAPSHOT_CREATED : snapshot_name=snap1 volume_name=test_vol
                            snapshot_uuid=26dd6c52-6021-40b1-a507-001a80401d70
2. EVENT_SNAPSHOT_CREATE_FAILED : snapshot_name=snap1 volume_name=test_vol
                                  error=Snapshot snap1 already exists
3. EVENT_SNAPSHOT_ACTIVATED : snapshot_name=snap1
                              snapshot_uuid=26dd6c52-6021-40b1-a507-001a80401d70
4. EVENT_SNAPSHOT_ACTIVATE_FAILED: snapshot_name=snap1
                                   error=Snapshot snap1 is already activated.
5. EVENT_SNAPSHOT_DEACTIVATED : snapshot_name=snap1
                              snapshot_uuid=26dd6c52-6021-40b1-a507-001a80401d70
6. EVENT_SNAPSHOT_DEACTIVATE_FAILED : snapshot_name=snap3
                                      error=Snapshot (snap3) does not exist.
7. EVENT_SNAPSHOT_SOFT_LIMIT_REACHED : volume_name=test_vol
                                  volume_id=2ace2616-5591-4b9b-be2a-38592dda5758
8. EVENT_SNAPSHOT_HARD_LIMIT_REACHED : volume_name=test_vol
                                  volume_id=2ace2616-5591-4b9b-be2a-38592dda5758
9. EVENT_SNAPSHOT_RESTORED : snapshot_name=snap1 volume_name=test_vol
                             snapshot_uuid=3a840ec5-08da-4f2b-850d-1d5539a5d14d
10. EVENT_SNAPSHOT_RESTORE_FAILED : snapshot_name=snap10
                                    error=Snapshot (snap10) does not exist
11. EVENT_SNAPSHOT_DELETED : snapshot_name=snap1
                             snapshot_uuid=d9ff3d4f-f579-4345-a4da-4f9353f0950c
12. EVENT_SNAPSHOT_DELETE_FAILED : snapshot_name=snap2
                                   error=Snapshot (snap2) does not exist
13. EVENT_SNAPSHOT_CLONED : clone_uuid=93ba9f06-cb9c-4ace-aa52-2616e7f31022
                            snapshot_name=snap1 clone_name=clone2
14. EVENT_SNAPSHOT_CLONE_FAILED : snapshot_name=snap1 clone_name=clone2
                                  error=Volume with name:clone2 already exists
15. EVENT_SNAPSHOT_CONFIG_UPDATED : auto-delete=enable config_type=system_config
                                    config_type=volume_config hard_limit=100
16. EVENT_SNAPSHOT_CONFIG_UPDATE_FAILED :
                   error=Invalid snap-max-soft-limit 110. Expected range 1 - 100
17. EVENT_SNAPSHOT_SCHEDULER_INITIALISED : status=Success
18. EVENT_SNAPSHOT_SCHEDULER_INIT_FAILED
19. EVENT_SNAPSHOT_SCHEDULER_ENABLED : status=Successfuly Enabled
20. EVENT_SNAPSHOT_SCHEDULER_ENABLE_FAILED :
                                   error=Snapshot scheduler is already enabled.
21. EVENT_SNAPSHOT_SCHEDULER_SCHEDULE_ADDED : status=Successfuly added job job1
22. EVENT_SNAPSHOT_SCHEDULER_SCHEDULE_ADD_FAILED :
                    status=Failed to add job job1 error=The job already exists.
23. EVENT_SNAPSHOT_SCHEDULER_SCHEDULE_EDITED :
                                             status=Successfuly edited job job1
24. EVENT_SNAPSHOT_SCHEDULER_SCHEDULE_EDIT_FAILED :
                                                 status=Failed to edit job job2
                                                 error=The job cannot be found.
25. EVENT_SNAPSHOT_SCHEDULER_SCHEDULE_DELETED :
                                            status=Successfuly deleted job job1
26. EVENT_SNAPSHOT_SCHEDULER_SCHEDULE_DELETE_FAILED :
                                               status=Failed to delete job job1
                                               error=The job cannot be found.
27. EVENT_SNAPSHOT_SCHEDULER_DISABLED : status=Successfuly Disabled
28. EVENT_SNAPSHOT_SCHEDULER_DISABLE_FAILED :
                                   error=Snapshot scheduler is already disabled.


> Reviewed-on: http://review.gluster.org/15329
> Tested-by: Aravinda VK <avishwan@redhat.com>
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>

(cherry picked from commit c1278de9a5fb6a64455f42b8b17a8d05b74c2420)

Change-Id: I3479cc3fb7af3c76ded67cf289f99547d0a55d21
BUG: 1372278
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-on: http://review.gluster.org/15381
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>

2 files changed, 99 insertions, 7 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-snapshot-utils.c b/xlators/mgmt/glusterd/src/glusterd-snapshot-utils.c
index 836184726a2..3f9e51e50cf 100644
--- a/xlators/mgmt/glusterd/src/glusterd-snapshot-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-snapshot-utils.c
@@ -4042,6 +4042,7 @@ glusterd_is_snap_soft_limit_reached (glusterd_volinfo_t *volinfo, dict_t *dict)
                                 "set soft limit exceed flag in "
                                 "response dictionary");
                 }
+
                 goto out;
         }
         ret = 0;
diff --git a/xlators/mgmt/glusterd/src/glusterd-snapshot.c b/xlators/mgmt/glusterd/src/glusterd-snapshot.c
index 5a9ba003578..4908b527114 100644
--- a/xlators/mgmt/glusterd/src/glusterd-snapshot.c
+++ b/xlators/mgmt/glusterd/src/glusterd-snapshot.c
@@ -61,6 +61,7 @@
 #include "xdr-generic.h"
 
 #include "lvm-defaults.h"
+#include "events.h"
 
 char snap_mount_dir[PATH_MAX];
 struct snap_create_args_ {
@@ -7946,6 +7947,7 @@ glusterd_handle_snap_limit (dict_t *dict, dict_t *rsp_dict)
         int                 i                   = 0;
         char               *volname             = NULL;
         char                key[PATH_MAX]       = {0, };
+        char                msg[PATH_MAX]       = {0, };
         glusterd_volinfo_t *volinfo             = NULL;
         uint64_t            limit               = 0;
         int64_t             count               = 0;
@@ -8020,6 +8022,10 @@ glusterd_handle_snap_limit (dict_t *dict, dict_t *rsp_dict)
                         "Deleting snapshot %s.", limit, volinfo->volname,
                         snap->snapname);
 
+                snprintf (msg, sizeof(msg), "snapshot_name=%s;"
+                          "snapshot_uuid=%s", snap->snapname,
+                          uuid_utoa(snap->snap_id));
+
                 LOCK (&snap->lock);
                 {
                         snap->snap_status = GD_SNAP_STATUS_DECOMMISSION;
@@ -8042,6 +8048,13 @@ glusterd_handle_snap_limit (dict_t *dict, dict_t *rsp_dict)
                                         snap->snapname);
                 }
         unlock: UNLOCK (&snap->lock);
+                if (is_origin_glusterd (dict) == _gf_true) {
+                        if (ret)
+                                gf_event (EVENT_SNAPSHOT_DELETE_FAILED,
+                                          "%s", msg);
+                        else
+                                gf_event (EVENT_SNAPSHOT_DELETED, "%s", msg);
+                }
         }
 
 out:
@@ -8127,13 +8140,20 @@ int32_t
 glusterd_snapshot_create_postvalidate (dict_t *dict, int32_t op_ret,
                                        char **op_errstr, dict_t *rsp_dict)
 {
-        xlator_t        *this           = NULL;
-        glusterd_conf_t *priv           = NULL;
-        int              ret            = -1;
-        int32_t          cleanup        = 0;
-        glusterd_snap_t *snap           = NULL;
-        char            *snapname       = NULL;
-        char            *auto_delete    = NULL;
+        xlator_t             *this                = NULL;
+        glusterd_conf_t      *priv                = NULL;
+        int                   ret                 = -1;
+        int32_t               cleanup             = 0;
+        glusterd_snap_t      *snap                = NULL;
+        char                 *snapname            = NULL;
+        char                 *auto_delete         = NULL;
+        char                 *volname             = NULL;
+        glusterd_volinfo_t   *volinfo             = NULL;
+        uint64_t              opt_hard_max        = GLUSTERD_SNAPS_MAX_HARD_LIMIT;
+        uint64_t              opt_max_soft        = GLUSTERD_SNAPS_DEF_SOFT_LIMIT_PERCENT;
+        int64_t               effective_max_limit = 0;
+        int64_t               soft_limit          = 0;
+        int32_t               snap_activate       = _gf_false;
 
         this = THIS;
 
@@ -8200,6 +8220,77 @@ glusterd_snapshot_create_postvalidate (dict_t *dict, int32_t op_ret,
                 goto out;
         }
 
+        /*
+         * If activate_on_create was enabled, and we have reached this  *
+         * section of the code, that means, that after successfully     *
+         * creating the snapshot, we have also successfully started the *
+         * snapshot bricks on all nodes. So from originator node we can *
+         * send EVENT_SNAPSHOT_ACTIVATED event.                         *
+         *                                                              *
+         * Also check, if hard limit and soft limit is reached in case  *
+         * of successfuly creating the snapshot, and generate the event *
+         */
+        if (is_origin_glusterd (dict) == _gf_true) {
+                snap_activate = dict_get_str_boolean (priv->opts,
+                                              GLUSTERD_STORE_KEY_SNAP_ACTIVATE,
+                                              _gf_false);
+
+                if (snap_activate == _gf_true) {
+                        gf_event (EVENT_SNAPSHOT_ACTIVATED, "snapshot_name=%s;"
+                                  "snapshot_uuid=%s", snap->snapname,
+                                  uuid_utoa(snap->snap_id));
+                }
+
+                ret = dict_get_str (dict, "volname1", &volname);
+                if (ret) {
+                        gf_msg (this->name, GF_LOG_ERROR, 0,
+                                GD_MSG_DICT_GET_FAILED,
+                                "Failed to get volname.");
+                        goto out;
+                }
+
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (ret) {
+                        gf_msg (this->name, GF_LOG_ERROR, 0,
+                                GD_MSG_VOL_NOT_FOUND,
+                                "Failed to get volinfo.");
+                        goto out;
+                }
+
+                /* config values snap-max-hard-limit and snap-max-soft-limit are
+                 * optional and hence we are not erroring out if values are not
+                 * present
+                 */
+                gd_get_snap_conf_values_if_present (priv->opts, &opt_hard_max,
+                                                    &opt_max_soft);
+
+                if (volinfo->snap_max_hard_limit < opt_hard_max)
+                        effective_max_limit = volinfo->snap_max_hard_limit;
+                else
+                        effective_max_limit = opt_hard_max;
+
+                /*
+                 * Check for hard limit. If it is reached after taking *
+                 * this snapshot, then generate event for the same. If *
+                 * it is not reached, then check for the soft limit,   *
+                 * and generate event accordingly.                     *
+                 */
+                if (volinfo->snap_count >= effective_max_limit) {
+                        gf_event (EVENT_SNAPSHOT_HARD_LIMIT_REACHED,
+                                  "volume_name=%s;volume_id=%s",
+                                  volname,
+                                  uuid_utoa(volinfo->volume_id));
+                } else {
+                        soft_limit = (opt_max_soft * effective_max_limit)/100;
+                        if (volinfo->snap_count >= soft_limit) {
+                                gf_event (EVENT_SNAPSHOT_SOFT_LIMIT_REACHED,
+                                          "volume_name=%s;volume_id=%s",
+                                          volname,
+                                          uuid_utoa(volinfo->volume_id));
+                        }
+                }
+        }
+
         /* "auto-delete" might not be set by user explicitly,
          * in that case it's better to consider the default value.
          * Hence not erroring out if Key is not found.