features/changelog: changelog translator

This is the initial version of the Changelog Translator.

What is it
-----------
Goal is to capture changes performed on a GlusterFS volume.
The translator needs to be loaded on the server (bricks) and
captures changes in a plain text file inside a configured
directory path (controlled by "changelog-dir", should be
somewhere in <export>/.glusterfs/changelog by default).

Changes are classified into 3 types:
    - Data:     : TYPE-I
    - Metadata  : TYPE-II
    - Entry     : TYPE-III

Changelog file is rolled over after a certain time interval
(defauls to 60 seconds) after which a changelog is started.
The thing to be noted here is that for a time interval
(time slice) multiple changes for an inode are recorded only
once (ie. say for 100+ writes on an inode that happens within
the time slice has only a single corresponding entry in the
changelog file). That way we do not bloat up the changelog
and also save lots of writes.

Changelog Format
-----------------
TYPE-I and TYPE-II changes have the gfid on the entity on
which the operation happened. TYPE-III being a entry op
requires the parent gfid and the basename. Changelog format
has been kept to a minimal and it's upto the consumers to
do the heavy loading of figuring out deletes, renames etc..
A single changelog file records all three types of changes,
with each change starting with an identifier ("D": DATA,
"M": METADATA and "E": ENTRY). Option is provided for the
encoding type (See TUNABLES).

Consumers
----------
The only consumer as of today would be geo-replication, although
backup utilities, self-heal, bit-rot detection could be possible
consumers in the future.

CLI
----
By default, change-logging is disabled (the translator is present
in the server graph but does nothing). When enabled (via cli) each
brick starts to log the changes. There are a set of tunable that
can be used to change the translators behaviour:

- enable/disable changelog (disabled by default)
  gluster volume set <volume> changelog {on|off}

- set the logging directory (<brick>/.glusterfs/changelogs is the
  default)
  gluster volume set <volume> changelog-dir /path/to/dir

- select encoding type (binary (default) or ascii)
  gluster volume set <volume> encoding {binary|ascii}

- change the rollover time for the logs (60 secs by default)
  gluster volume set <volume> rollover-time <secs>

- when secs > 0, changelog file is not open()'d with O_SYNC flag
- and fsync is trigerred periodically every <secs> seconds.
  gluster volume set <volume> fsync-interval <secs>

features/changelog: changelog consumer library (libgfchangelog)

A shared library is provided for the consumer of the changelogs
for easy acess via APIs. Application can link against this library
and request for changelog updates. Conversion of binary logs to
human-readable ascii format is also taken care by the library which
keeps a copy of the changelog in application provided working
directory.

Change-Id: I75575fb7f1c53d2bec3dba1a329ea7bb3c628497
BUG: 847839
Original Author: Venky Shankar <vshankar@redhat.com>
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-on: http://review.gluster.org/5127
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

3 files changed, 14 insertions, 0 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 034e3da25ea..6eb886b384a 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -59,6 +59,16 @@ struct dnscache6 {
         struct addrinfo *next;
 };
 
+void
+md5_wrapper(const unsigned char *data, size_t len, char *md5)
+{
+        unsigned short i = 0;
+        unsigned short lim = MD5_DIGEST_LENGTH*2+1;
+        unsigned char scratch[MD5_DIGEST_LENGTH] = {0,};
+        MD5(data, len, scratch);
+        for (; i < MD5_DIGEST_LENGTH; i++)
+                snprintf(md5 + i * 2, lim-i*2, "%02x", scratch[i]);
+}
 
 /* works similar to mkdir(1) -p.
  */
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index b0d9c18b31d..bf41444d13a 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -23,6 +23,7 @@
 #include <string.h>
 #include <assert.h>
 #include <pthread.h>
+#include <openssl/md5.h>
 #ifndef GF_BSD_HOST_OS
 #include <alloca.h>
 #endif
@@ -584,5 +585,6 @@ gf_boolean_t gf_ports_reserved (char *blocked_port, gf_boolean_t *ports);
 int gf_get_hostname_from_ip (char *client_ip, char **hostname);
 gf_boolean_t gf_is_local_addr (char *hostname);
 gf_boolean_t gf_is_same_address (char *host1, char *host2);
+void md5_wrapper(const unsigned char *data, size_t len, char *md5);
 
 #endif /* _COMMON_UTILS_H */
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 6c09e89b2eb..dbb2b58d951 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -156,6 +156,8 @@
 #define GF_REMOVE_BRICK_TID_KEY  "remove-brick-id"
 #define GF_REPLACE_BRICK_TID_KEY "replace-brick-id"
 
+#define UUID_CANONICAL_FORM_LEN  36
+
 /* NOTE: add members ONLY at the end (just before _MAXVALUE) */
 typedef enum {
         GF_FOP_NULL = 0,