[dm-devel] [PATCH v2 1/1] add display of map information in JSON format
Todd Gill
tgill at redhat.com
Tue May 10 19:05:28 UTC 2016
The patch add these commands:
multipathd show maps json
multipathd show map $map json
Each command will output the requested map(s) in JSON.
For the "show maps json" command, the patch pre-allocates
INITIAL_REPLY_LEN * PRINT_JSON_MULTIPLIER(5). The JSON text
is about 5x the size of the "show maps topology" text.
Signed-off-by: Todd Gill <tgill at redhat.com>
---
libmultipath/print.c | 163 ++++++++++++++++++++++++++++++++++++++++++++++
libmultipath/print.h | 63 ++++++++++++++++++
multipathd/cli.c | 3 +
multipathd/cli.h | 2 +
multipathd/cli_handlers.c | 93 ++++++++++++++++++++++++++
multipathd/cli_handlers.h | 2 +
multipathd/main.c | 2 +
7 files changed, 328 insertions(+)
diff --git a/libmultipath/print.c b/libmultipath/print.c
index 7fec6e9..e92b534 100644
--- a/libmultipath/print.c
+++ b/libmultipath/print.c
@@ -1000,6 +1000,169 @@ snprint_multipath_topology (char * buff, int len, struct multipath * mpp,
}
static int
+snprint_json (char * line, int len, int indent, char *json_str)
+{
+ int fwd = 0, i;
+
+ for (i = 0; i < indent; i++) {
+ fwd += snprintf(line + fwd, len - fwd, PRINT_JSON_INDENT);
+ if (fwd > len)
+ return fwd;
+ }
+
+ fwd += snprintf(line + fwd, len - fwd, "%s", json_str);
+ return fwd;
+}
+
+static int
+snprint_json_header (char * line, int len)
+{
+ int fwd = 0;
+
+ fwd += snprint_json(line + fwd, len, 0, PRINT_JSON_START_ELEM);
+ if (fwd > len)
+ return fwd;
+
+ fwd += snprintf(line + fwd, len - fwd, PRINT_JSON_START_VERSION,
+ PRINT_JSON_MAJOR_VERSION, PRINT_JSON_MINOR_VERSION);
+ return fwd;
+}
+
+static int
+snprint_json_elem_footer (char * line, int len, int indent, int last)
+{
+ int fwd = 0, i;
+
+ for (i = 0; i < indent; i++) {
+ fwd += snprintf(line + fwd, len - fwd, PRINT_JSON_INDENT);
+ if (fwd > len)
+ return fwd;
+ }
+
+ if (last == 1)
+ fwd += snprintf(line + fwd, len - fwd, "%s",
+ PRINT_JSON_END_LAST);
+ else
+ fwd += snprintf(line + fwd, len - fwd, "%s",
+ PRINT_JSON_END_ELEM);
+ return fwd;
+}
+
+static int
+snprint_multipath_fields_json (char * buff, int len,
+ struct multipath * mpp, int last)
+{
+ int i, j, fwd = 0;
+ struct path *pp;
+ struct pathgroup *pgp;
+
+ fwd += snprint_multipath(buff + fwd, len - fwd, PRINT_JSON_MAP, mpp, 0);
+ if (fwd > len)
+ return fwd;
+
+ fwd += snprint_json(buff + fwd, len - fwd, 2, PRINT_JSON_START_GROUPS);
+ if (fwd > len)
+ return fwd;
+
+ vector_foreach_slot (mpp->pg, pgp, i) {
+
+ pgp->selector = mpp->selector;
+ fwd += snprint_pathgroup(buff + fwd, len - fwd, PRINT_JSON_GROUP, pgp);
+ if (fwd > len)
+ return fwd;
+
+ fwd += snprint_json(buff + fwd, len - fwd, 3, PRINT_JSON_START_PATHS);
+ if (fwd > len)
+ return fwd;
+
+ vector_foreach_slot (pgp->paths, pp, j) {
+
+ fwd += snprint_path(buff + fwd,
+ len - fwd, PRINT_JSON_PATH, pp, 0);
+ if (fwd > len)
+ return fwd;
+
+ fwd += snprint_json_elem_footer(buff + fwd,
+ len - fwd, 3, j + 1 == VECTOR_SIZE(pgp->paths));
+ if (fwd > len)
+ return fwd;
+ }
+
+ fwd += snprint_json(buff + fwd, len - fwd, 0, PRINT_JSON_END_ARRAY);
+ if (fwd > len)
+ return fwd;
+
+ fwd += snprint_json_elem_footer(buff + fwd,
+ len - fwd, 2, i + 1 == VECTOR_SIZE(mpp->pg));
+ if (fwd > len)
+ return fwd;
+ }
+
+ fwd += snprint_json(buff + fwd, len - fwd, 0, PRINT_JSON_END_ARRAY);
+ if (fwd > len)
+ return fwd;
+
+ fwd += snprint_json_elem_footer(buff + fwd, len - fwd, 1, last);
+ return fwd;
+}
+
+int
+snprint_multipath_map_json (char * buff, int len,
+ struct multipath * mpp, int last){
+ int fwd = 0;
+
+ memset(buff, 0, len);
+ fwd += snprint_json_header(buff + fwd, len);
+ if (fwd > len)
+ return len;
+
+ fwd += snprint_json(buff + fwd, len - fwd, 0, PRINT_JSON_START_MAP);
+ if (fwd > len)
+ return len;
+
+ fwd += snprint_multipath_fields_json(buff + fwd, len - fwd, mpp, 1);
+ if (fwd > len)
+ return len;
+
+ fwd += snprint_json(buff + fwd, len - fwd, 0, "\n"PRINT_JSON_END_LAST);
+ if (fwd > len)
+ return len;
+ return fwd;
+}
+
+int
+snprint_multipath_topology_json (char * buff, int len, struct vectors * vecs)
+{
+ int i, fwd = 0;
+ struct multipath * mpp;
+
+ memset(buff, 0, len);
+ fwd += snprint_json_header(buff + fwd, len);
+ if (fwd > len)
+ return len;
+
+ fwd += snprint_json(buff + fwd, len - fwd, 1, PRINT_JSON_START_MAPS);
+ if (fwd > len)
+ return len;
+
+ vector_foreach_slot(vecs->mpvec, mpp, i) {
+ fwd += snprint_multipath_fields_json(buff + fwd, len - fwd,
+ mpp, i + 1 == VECTOR_SIZE(vecs->mpvec));
+ if (fwd > len)
+ return len;
+ }
+
+ fwd += snprint_json(buff + fwd, len - fwd, 0, PRINT_JSON_END_ARRAY);
+ if (fwd > len)
+ return len;
+
+ fwd += snprint_json(buff + fwd, len - fwd, 0, PRINT_JSON_END_LAST);
+ if (fwd > len)
+ return len;
+ return fwd;
+}
+
+static int
snprint_hwentry (char * buff, int len, struct hwentry * hwe)
{
int i;
diff --git a/libmultipath/print.h b/libmultipath/print.h
index 8bd0bbc..f8a383d 100644
--- a/libmultipath/print.h
+++ b/libmultipath/print.h
@@ -7,6 +7,65 @@
#define PRINT_MAP_PROPS "size=%S features='%f' hwhandler='%h' wp=%r"
#define PRINT_PG_INDENT "policy='%s' prio=%p status=%t"
+#define PRINT_JSON_MULTIPLIER 5
+#define PRINT_JSON_MAJOR_VERSION 0
+#define PRINT_JSON_MINOR_VERSION 1
+#define PRINT_JSON_START_VERSION " \"major_version \": %d,\n" \
+ " \"minor_version \": %d,\n"
+#define PRINT_JSON_START_ELEM "{\n"
+#define PRINT_JSON_START_MAP " \"map\":"
+#define PRINT_JSON_START_MAPS "\"maps\": ["
+#define PRINT_JSON_START_PATHS "\"paths\": ["
+#define PRINT_JSON_START_GROUPS "\"path_groups\": ["
+#define PRINT_JSON_END_ELEM "},"
+#define PRINT_JSON_END_LAST "}"
+#define PRINT_JSON_END_ARRAY "]\n"
+#define PRINT_JSON_INDENT " "
+#define PRINT_JSON_MAP "{\n" \
+ " \"name\" : \"%n\",\n" \
+ " \"uuid\" : \"%w\",\n" \
+ " \"sysfs\" : \"%d\",\n" \
+ " \"failback\" : \"%F\",\n" \
+ " \"queueing\" : \"%Q\",\n" \
+ " \"paths\" : %N,\n" \
+ " \"write_prot\" : \"%r\",\n" \
+ " \"dm-st\" : \"%t\",\n" \
+ " \"size\" : \"%S\",\n" \
+ " \"features\" : \"%f\",\n" \
+ " \"hwhandler\" : \"%h\",\n" \
+ " \"action\" : \"%A\",\n" \
+ " \"path_faults\" : %0,\n" \
+ " \"vend/prod/rev\" : \"%s\",\n" \
+ " \"switch_grp\" : %1,\n" \
+ " \"map_loads\" : %2,\n" \
+ " \"total_q_time\" : %3,\n" \
+ " \"q_timeouts\" : %4,"
+
+#define PRINT_JSON_GROUP "{\n" \
+ " \"selector\" : \"%s\",\n" \
+ " \"pri\" : %p,\n" \
+ " \"dm_st\" : \"%t\","
+
+#define PRINT_JSON_PATH "{\n" \
+ " \"uuid\" : \"%w\",\n" \
+ " \"hcil\" : \"%i\",\n" \
+ " \"dev\" : \"%d\",\n"\
+ " \"dev_t\" : \"%D\",\n" \
+ " \"dm_st\" : \"%t\",\n" \
+ " \"dev_st\" : \"%o\",\n" \
+ " \"chk_st\" : \"%T\",\n" \
+ " \"vend/prod/rev\" : \"%s\",\n" \
+ " \"checker\" : \"%c\",\n" \
+ " \"next_check\" : \"%C\",\n" \
+ " \"pri\" : %p,\n" \
+ " \"size\" : \"%S\",\n" \
+ " \"serial\" : \"%z\",\n" \
+ " \"host WWNN\" : \"%N\",\n" \
+ " \"target WWNN\" : \"%n\",\n" \
+ " \"host WWPN\" : \"%R\",\n" \
+ " \"target WWPN\" : \"%r\",\n" \
+ " \"host adapter\" : \"%a\""
+
#define MAX_LINE_LEN 80
#define MAX_LINES 64
#define MAX_FIELD_LEN 64
@@ -41,6 +100,10 @@ int snprint_path (char *, int, char *, struct path *, int);
int snprint_multipath (char *, int, char *, struct multipath *, int);
int snprint_multipath_topology (char *, int, struct multipath * mpp,
int verbosity);
+int snprint_multipath_topology_json (char * buff, int len,
+ struct vectors * vecs);
+int snprint_multipath_map_json (char * buff, int len,
+ struct multipath * mpp, int last);
int snprint_defaults (char *, int);
int snprint_blacklist (char *, int);
int snprint_blacklist_except (char *, int);
diff --git a/multipathd/cli.c b/multipathd/cli.c
index d991cd0..20ee3db 100644
--- a/multipathd/cli.c
+++ b/multipathd/cli.c
@@ -207,6 +207,7 @@ load_keys (void)
r += add_key(keys, "setprstatus", SETPRSTATUS, 0);
r += add_key(keys, "unsetprstatus", UNSETPRSTATUS, 0);
r += add_key(keys, "format", FMT, 1);
+ r += add_key(keys, "json", JSON, 0);
if (r) {
free_keys(keys);
@@ -537,8 +538,10 @@ cli_init (void) {
add_handler(LIST+MAPS+FMT, NULL);
add_handler(LIST+MAPS+RAW+FMT, NULL);
add_handler(LIST+MAPS+TOPOLOGY, NULL);
+ add_handler(LIST+MAPS+JSON, NULL);
add_handler(LIST+TOPOLOGY, NULL);
add_handler(LIST+MAP+TOPOLOGY, NULL);
+ add_handler(LIST+MAP+JSON, NULL);
add_handler(LIST+MAP+FMT, NULL);
add_handler(LIST+MAP+RAW+FMT, NULL);
add_handler(LIST+CONFIG, NULL);
diff --git a/multipathd/cli.h b/multipathd/cli.h
index 84ca40f..92cb41b 100644
--- a/multipathd/cli.h
+++ b/multipathd/cli.h
@@ -36,6 +36,7 @@ enum {
__SETPRSTATUS,
__UNSETPRSTATUS,
__FMT,
+ __JSON,
};
#define LIST (1 << __LIST)
@@ -74,6 +75,7 @@ enum {
#define SETPRSTATUS (1ULL << __SETPRSTATUS)
#define UNSETPRSTATUS (1ULL << __UNSETPRSTATUS)
#define FMT (1ULL << __FMT)
+#define JSON (1ULL << __JSON)
#define INITIAL_REPLY_LEN 1200
diff --git a/multipathd/cli_handlers.c b/multipathd/cli_handlers.c
index 8b3cb9d..19cf2ff 100644
--- a/multipathd/cli_handlers.c
+++ b/multipathd/cli_handlers.c
@@ -156,6 +156,70 @@ show_maps_topology (char ** r, int * len, struct vectors * vecs)
}
int
+show_maps_json (char ** r, int * len, struct vectors * vecs)
+{
+ int i;
+ struct multipath * mpp;
+ char * c;
+ char * reply;
+ unsigned int maxlen = INITIAL_REPLY_LEN * PRINT_JSON_MULTIPLIER;
+ int again = 1;
+
+ vector_foreach_slot(vecs->mpvec, mpp, i) {
+ if (update_multipath(vecs, mpp->alias, 0)) {
+ return 1;
+ }
+ }
+
+ reply = MALLOC(maxlen);
+
+ while (again) {
+ if (!reply)
+ return 1;
+
+ c = reply;
+
+ c += snprint_multipath_topology_json(c, reply + maxlen - c,
+ vecs);
+ again = ((c - reply) == maxlen);
+
+ REALLOC_REPLY(reply, again, maxlen);
+ }
+ *r = reply;
+ *len = (int)(c - reply + 1);
+ return 0;
+}
+
+int
+show_map_json (char ** r, int * len, struct multipath * mpp,
+ struct vectors * vecs)
+{
+ char * c;
+ char * reply;
+ unsigned int maxlen = INITIAL_REPLY_LEN;
+ int again = 1;
+
+ if (update_multipath(vecs, mpp->alias, 0))
+ return 1;
+ reply = MALLOC(maxlen);
+
+ while (again) {
+ if (!reply)
+ return 1;
+
+ c = reply;
+
+ c += snprint_multipath_map_json(c, reply + maxlen - c, mpp, 1);
+ again = ((c - reply) == maxlen);
+
+ REALLOC_REPLY(reply, again, maxlen);
+ }
+ *r = reply;
+ *len = (int)(c - reply + 1);
+ return 0;
+}
+
+int
show_config (char ** r, int * len)
{
char * c;
@@ -291,6 +355,35 @@ cli_list_maps_topology (void * v, char ** reply, int * len, void * data)
}
int
+cli_list_map_json (void * v, char ** reply, int * len, void * data)
+{
+ struct multipath * mpp;
+ struct vectors * vecs = (struct vectors *)data;
+ char * param = get_keyparam(v, MAP);
+
+ param = convert_dev(param, 0);
+ get_path_layout(vecs->pathvec, 0);
+ mpp = find_mp_by_str(vecs->mpvec, param);
+
+ if (!mpp)
+ return 1;
+
+ condlog(3, "list multipath json %s (operator)", param);
+
+ return show_map_json(reply, len, mpp, vecs);
+}
+
+int
+cli_list_maps_json (void * v, char ** reply, int * len, void * data)
+{
+ struct vectors * vecs = (struct vectors *)data;
+
+ condlog(3, "list multipaths json (operator)");
+
+ return show_maps_json(reply, len, vecs);
+}
+
+int
cli_list_wildcards (void * v, char ** reply, int * len, void * data)
{
char * c;
diff --git a/multipathd/cli_handlers.h b/multipathd/cli_handlers.h
index 5d51018..e838f19 100644
--- a/multipathd/cli_handlers.h
+++ b/multipathd/cli_handlers.h
@@ -13,6 +13,8 @@ int cli_list_maps_status (void * v, char ** reply, int * len, void * data);
int cli_list_maps_stats (void * v, char ** reply, int * len, void * data);
int cli_list_map_topology (void * v, char ** reply, int * len, void * data);
int cli_list_maps_topology (void * v, char ** reply, int * len, void * data);
+int cli_list_map_json (void * v, char ** reply, int * len, void * data);
+int cli_list_maps_json (void * v, char ** reply, int * len, void * data);
int cli_list_config (void * v, char ** reply, int * len, void * data);
int cli_list_blacklist (void * v, char ** reply, int * len, void * data);
int cli_list_devices (void * v, char ** reply, int * len, void * data);
diff --git a/multipathd/main.c b/multipathd/main.c
index 58e8854..33f38cd 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -1120,9 +1120,11 @@ uxlsnrloop (void * ap)
set_handler_callback(LIST+MAPS+RAW+FMT, cli_list_maps_raw);
set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
+ set_handler_callback(LIST+MAPS+JSON, cli_list_maps_json);
set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
set_handler_callback(LIST+MAP+FMT, cli_list_map_fmt);
set_handler_callback(LIST+MAP+RAW+FMT, cli_list_map_fmt);
+ set_handler_callback(LIST+MAP+JSON, cli_list_map_json);
set_unlocked_handler_callback(LIST+CONFIG, cli_list_config);
set_unlocked_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
set_handler_callback(LIST+DEVICES, cli_list_devices);
--
2.5.5
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