Show how to use oberve to request state of the key on the cluster.
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <libcouchbase/api3.h>
#define fail(msg) \
fprintf(stderr, "%s\n", msg); \
exit(EXIT_FAILURE)
#define fail2(msg, err) \
fprintf(stderr, "%s\n", msg); \
fprintf(stderr, "Error was 0x%x (%s)\n", err, lcb_strerror(NULL, err)); \
exit(EXIT_FAILURE)
typedef struct {
int master;
lcb_U8 status;
lcb_U64 cas;
} node_info;
typedef struct {
unsigned nresp;
node_info *nodeinfo;
} observe_info;
static void
{
observe_info *obs_info = (observe_info *)rb->
cookie;
node_info *ni = &obs_info->nodeinfo[obs_info->nresp];
fprintf(stderr, "All nodes have replied\n");
return;
}
fprintf(stderr, "Failed to observe key from node. 0x%x (%s)\n",
obs_info->nresp++;
return;
}
obs_info->nresp++;
}
int main(int argc, char *argv[])
{
observe_info obs_info;
unsigned nservers, ii;
if (argc < 2) {
fail("Requires key as argument\n"
"Usage: observe KEY [CONNSTRING [ PASSWORD [ USERNAME ] ] ]\n");
}
if (argc > 2) {
}
if (argc > 3) {
}
if (argc > 4) {
}
fail2("cannot create connection instance", err);
}
fail2("Couldn't schedule connection", err);
}
fail2("Couldn't get initial cluster configuration", err);
}
obs_info.nodeinfo = calloc(nservers, sizeof (*obs_info.nodeinfo));
obs_info.nresp = 0;
printf("observing the state of '%s':\n", argv[1]);
fail2("Couldn't schedule observe request", err);
}
for (ii = 0; ii < obs_info.nresp; ii++) {
node_info *ni = &obs_info.nodeinfo[ii];
fprintf(stderr, "Got status from %s node:\n", ni->master ? "master" : "replica");
fprintf(stderr, "\tCAS: 0x0%llx\n", ni->cas);
fprintf(stderr, "\tStatus (RAW): 0x%02x\n", ni->status);
fprintf(stderr, "\n");
}
obs_info.nresp = 0;
memset(obs_info.nodeinfo, 0, sizeof(obs_info.nodeinfo[0]) * nservers);
fprintf(stderr, "Will request CAS from master...\n");
fail2("Couldn't schedule observe request!\n", err);
}
assert(obs_info.nresp == 1 && obs_info.nodeinfo[0].master);
fprintf(stderr, "CAS on master is 0x%llx\n", obs_info.nodeinfo[0].cas);
free(obs_info.nodeinfo);
return EXIT_SUCCESS;
}