[dm-devel] [PATCH v3 1/1] add display of map information in JSON format
Benjamin Marzinski
bmarzins at redhat.com
Fri May 13 15:03:56 UTC 2016
On Fri, May 13, 2016 at 10:39:00AM -0400, Todd Gill wrote:
ACK
-Ben
> The patch adds 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.
>
> v3:
>
> Added format specifiers at the map level to split out
> vend/prod/rev.
>
> A user can now specify the following with:
>
> multipathd show map(s) format
>
> %v - vend
> %p - prod
> %e - rev
>
> Signed-off-by: Todd Gill <tgill at redhat.com>
> ---
> libmultipath/print.c | 220 ++++++++++++++++++++++++++++++++++++++++++++++
> libmultipath/print.h | 65 ++++++++++++++
> 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, 387 insertions(+)
>
> diff --git a/libmultipath/print.c b/libmultipath/print.c
> index 7fec6e9..5d668bb 100644
> --- a/libmultipath/print.c
> +++ b/libmultipath/print.c
> @@ -274,6 +274,61 @@ snprint_multipath_vpr (char * buff, size_t len, struct multipath * mpp)
> return snprintf(buff, len, "##,##");
> }
>
> +
> +static int
> +snprint_multipath_vend (char * buff, size_t len, struct multipath * mpp)
> +{
> + struct pathgroup * pgp;
> + struct path * pp;
> + int i, j;
> +
> + vector_foreach_slot(mpp->pg, pgp, i) {
> + if (!pgp)
> + continue;
> + vector_foreach_slot(pgp->paths, pp, j) {
> + if (strlen(pp->vendor_id))
> + return snprintf(buff, len, "%s", pp->vendor_id);
> + }
> + }
> + return snprintf(buff, len, "##");
> +}
> +
> +static int
> +snprint_multipath_prod (char * buff, size_t len, struct multipath * mpp)
> +{
> + struct pathgroup * pgp;
> + struct path * pp;
> + int i, j;
> +
> + vector_foreach_slot(mpp->pg, pgp, i) {
> + if (!pgp)
> + continue;
> + vector_foreach_slot(pgp->paths, pp, j) {
> + if (strlen(pp->product_id))
> + return snprintf(buff, len, "%s", pp->product_id);
> + }
> + }
> + return snprintf(buff, len, "##");
> +}
> +
> +static int
> +snprint_multipath_rev (char * buff, size_t len, struct multipath * mpp)
> +{
> + struct pathgroup * pgp;
> + struct path * pp;
> + int i, j;
> +
> + vector_foreach_slot(mpp->pg, pgp, i) {
> + if (!pgp)
> + continue;
> + vector_foreach_slot(pgp->paths, pp, j) {
> + if (strlen(pp->rev))
> + return snprintf(buff, len, "%s", pp->rev);
> + }
> + }
> + return snprintf(buff, len, "##");
> +}
> +
> static int
> snprint_action (char * buff, size_t len, struct multipath * mpp)
> {
> @@ -577,6 +632,9 @@ struct multipath_data mpd[] = {
> {'3', "total_q_time", 0, snprint_total_q_time},
> {'4', "q_timeouts", 0, snprint_q_timeouts},
> {'s', "vend/prod/rev", 0, snprint_multipath_vpr},
> + {'v', "vend", 0, snprint_multipath_vend},
> + {'p', "prod", 0, snprint_multipath_prod},
> + {'e', "rev", 0, snprint_multipath_rev},
> {0, NULL, 0 , NULL}
> };
>
> @@ -1000,6 +1058,168 @@ snprint_multipath_topology (char * buff, int len, struct multipath * mpp,
> }
>
> static int
> +snprint_json (char * buff, int len, int indent, char *json_str)
> +{
> + int fwd = 0, i;
> +
> + for (i = 0; i < indent; i++) {
> + fwd += snprintf(buff + fwd, len - fwd, PRINT_JSON_INDENT);
> + if (fwd > len)
> + return fwd;
> + }
> +
> + fwd += snprintf(buff + fwd, len - fwd, "%s", json_str);
> + return fwd;
> +}
> +
> +static int
> +snprint_json_header (char * buff, int len)
> +{
> + int fwd = 0;
> +
> + fwd += snprint_json(buff, len, 0, PRINT_JSON_START_ELEM);
> + if (fwd > len)
> + return fwd;
> +
> + fwd += snprintf(buff + fwd, len - fwd, PRINT_JSON_START_VERSION,
> + PRINT_JSON_MAJOR_VERSION, PRINT_JSON_MINOR_VERSION);
> + return fwd;
> +}
> +
> +static int
> +snprint_json_elem_footer (char * buff, int len, int indent, int last)
> +{
> + int fwd = 0, i;
> +
> + for (i = 0; i < indent; i++) {
> + fwd += snprintf(buff + fwd, len - fwd, PRINT_JSON_INDENT);
> + if (fwd > len)
> + return fwd;
> + }
> +
> + if (last == 1)
> + fwd += snprintf(buff + fwd, len - fwd, "%s", PRINT_JSON_END_LAST_ELEM);
> + else
> + fwd += snprintf(buff + 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, len, 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, 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");
> + if (fwd > len)
> + return len;
> +
> + fwd += snprint_json(buff + fwd, len - fwd, 0, 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, 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..92ade7e 100644
> --- a/libmultipath/print.h
> +++ b/libmultipath/print.h
> @@ -7,6 +7,67 @@
> #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_ELEM "}"
> +#define PRINT_JSON_END_LAST "}\n"
> +#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\" : \"%v\",\n" \
> + " \"prod\" : \"%p\",\n" \
> + " \"rev\" : \"%e\",\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" \
> + " \"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 +102,10 @@ 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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