Code

Merged branch 'master' of git://git.tokkee.org/sysdb.
[sysdb.git] / src / core / store.c
index 888fbb973449870ae82b5c2910a386e47a2481f9..e9e0979e72e4db10ec99d34f2596f178c5d19317 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * syscollector - src/core/store.c
+ * SysDB - src/core/store.c
  * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
  * All rights reserved.
  *
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "syscollector.h"
+#include "sysdb.h"
 #include "core/store.h"
+#include "core/plugin.h"
+#include "utils/error.h"
 #include "utils/llist.h"
-#include "utils/string.h"
 
 #include <assert.h>
 
 #include <pthread.h>
 
 /*
- * private data types
+ * private variables
  */
 
-/* type used for looking up named objects */
-typedef struct {
-       sc_object_t parent;
-       const char *obj_name;
-} sc_store_lookup_obj_t;
-#define SC_STORE_LOOKUP_OBJ_INIT { SC_OBJECT_INIT, NULL }
+static sdb_llist_t *obj_list = NULL;
+static pthread_rwlock_t obj_lock = PTHREAD_RWLOCK_INITIALIZER;
 
 /*
- * private variables
+ * private types
  */
 
-static sc_llist_t *host_list = NULL;
-static pthread_rwlock_t host_lock = PTHREAD_RWLOCK_INITIALIZER;
+static sdb_type_t sdb_store_obj_type;
+static sdb_type_t sdb_attribute_type;
 
-/*
- * private helper functions
- */
+struct store_obj;
+typedef struct store_obj store_obj_t;
+
+struct store_obj {
+       sdb_object_t super;
+       sdb_time_t last_update;
+       store_obj_t *parent;
+};
+#define STORE_OBJ(obj) ((store_obj_t *)(obj))
+#define STORE_CONST_OBJ(obj) ((const store_obj_t *)(obj))
+
+typedef struct {
+       store_obj_t super;
+
+       char *value;
+} sdb_attribute_t;
+#define SDB_ATTR(obj) ((sdb_attribute_t *)(obj))
+#define SDB_CONST_ATTR(obj) ((const sdb_attribute_t *)(obj))
+
+typedef struct {
+       store_obj_t super;
+
+       int type;
+       sdb_llist_t *children;
+
+       sdb_llist_t *attributes;
+} sdb_store_obj_t;
+#define SDB_STORE_OBJ(obj) ((sdb_store_obj_t *)(obj))
+#define SDB_CONST_STORE_OBJ(obj) ((const sdb_store_obj_t *)(obj))
+
+enum {
+       SDB_HOST = 1,
+       SDB_SERVICE,
+       SDB_ATTRIBUTE,
+};
+#define TYPE_TO_NAME(t) \
+       (((t) == SDB_HOST) ? "host" \
+               : ((t) == SDB_SERVICE) ? "service" \
+               : ((t) == SDB_ATTRIBUTE) ? "attribute" : "unknown")
+
+/* shortcuts for accessing the sdb_store_obj_t attributes
+ * of inheriting objects */
+#define _last_update super.last_update
 
 static int
-sc_store_obj_cmp_by_name(const sc_object_t *a, const sc_object_t *b)
+store_obj_init(sdb_object_t *obj, va_list ap)
 {
-       const sc_store_obj_t *h1 = (const sc_store_obj_t *)a;
-       const sc_store_obj_t *h2 = (const sc_store_obj_t *)b;
+       store_obj_t *sobj = STORE_OBJ(obj);
+       sobj->last_update = va_arg(ap, sdb_time_t);
 
-       assert(h1 && h2);
-       return strcasecmp(h1->name, h2->name);
-} /* sc_store_obj_cmp_by_name */
+       sobj->parent = NULL;
+       return 0;
+} /* store_obj_init */
 
-static int
-sc_cmp_store_obj_with_name(const sc_object_t *a, const sc_object_t *b)
+static void
+store_obj_destroy(sdb_object_t *obj)
 {
-       const sc_store_obj_t *obj = (const sc_store_obj_t *)a;
-       const sc_store_lookup_obj_t *lookup = (const sc_store_lookup_obj_t *)b;
+       const store_obj_t *sobj = STORE_OBJ(obj);
 
-       assert(obj && lookup);
-       return strcasecmp(obj->name, lookup->obj_name);
-} /* sc_cmp_store_obj_with_name */
+       if (sobj->parent)
+               sdb_object_deref(SDB_OBJ(sobj->parent));
+} /* store_obj_destroy */
 
 static int
-sc_host_init(sc_object_t *obj, va_list ap)
+sdb_store_obj_init(sdb_object_t *obj, va_list ap)
 {
-       const char *name = va_arg(ap, const char *);
+       sdb_store_obj_t *sobj = SDB_STORE_OBJ(obj);
+       int ret;
 
-       SC_HOST(obj)->host_name = strdup(name);
-       if (! SC_HOST(obj)->host_name)
-               return -1;
+       ret = store_obj_init(obj, ap);
+       if (ret)
+               return ret;
 
-       SC_HOST(obj)->host_last_update = sc_gettime();
-       /* ignore errors -> last_update will be updated later */
+       sobj->type = va_arg(ap, int);
 
-       SC_HOST(obj)->services = sc_llist_create();
-       if (! SC_HOST(obj)->services)
+       sobj->children = sdb_llist_create();
+       if (! sobj->children)
+               return -1;
+       sobj->attributes = sdb_llist_create();
+       if (! sobj->attributes)
                return -1;
        return 0;
-} /* sc_host_init */
+} /* sdb_store_obj_init */
 
 static void
-sc_host_destroy(sc_object_t *obj)
+sdb_store_obj_destroy(sdb_object_t *obj)
 {
+       sdb_store_obj_t *sobj = SDB_STORE_OBJ(obj);
+
        assert(obj);
 
-       if (SC_HOST(obj)->host_name)
-               free(SC_HOST(obj)->host_name);
+       store_obj_destroy(obj);
 
-       if (SC_HOST(obj)->services)
-               sc_llist_destroy(SC_HOST(obj)->services);
-} /* sc_host_destroy */
+       if (sobj->children)
+               sdb_llist_destroy(sobj->children);
+       if (sobj->attributes)
+               sdb_llist_destroy(sobj->attributes);
+} /* sdb_store_obj_destroy */
 
 static int
-sc_svc_init(sc_object_t *obj, va_list ap)
+sdb_attr_init(sdb_object_t *obj, va_list ap)
 {
-       const char *hostname = va_arg(ap, const char *);
-       const char *name = va_arg(ap, const char *);
+       const char *value;
+       int ret;
 
-       SC_SVC(obj)->hostname = strdup(hostname);
-       SC_SVC(obj)->svc_name = strdup(name);
-       if ((! SC_SVC(obj)->hostname) || (! SC_SVC(obj)->svc_name))
-               return -1;
+       ret = store_obj_init(obj, ap);
+       if (ret)
+               return ret;
+       value = va_arg(ap, const char *);
 
-       SC_SVC(obj)->svc_last_update = sc_gettime();
-       /* ignore errors -> last_update will be updated later */
+       if (value) {
+               SDB_ATTR(obj)->value = strdup(value);
+               if (! SDB_ATTR(obj)->value)
+                       return -1;
+       }
        return 0;
-} /* sc_svc_init */
+} /* sdb_attr_init */
 
 static void
-sc_svc_destroy(sc_object_t *obj)
+sdb_attr_destroy(sdb_object_t *obj)
 {
        assert(obj);
 
-       if (SC_SVC(obj)->hostname)
-               free(SC_SVC(obj)->hostname);
-       if (SC_SVC(obj)->svc_name)
-               free(SC_SVC(obj)->svc_name);
-} /* sc_svc_destroy */
+       store_obj_destroy(obj);
+
+       if (SDB_ATTR(obj)->value)
+               free(SDB_ATTR(obj)->value);
+} /* sdb_attr_destroy */
+
+static sdb_type_t sdb_store_obj_type = {
+       sizeof(sdb_store_obj_t),
+
+       sdb_store_obj_init,
+       sdb_store_obj_destroy
+};
+
+static sdb_type_t sdb_attribute_type = {
+       sizeof(sdb_attribute_t),
+
+       sdb_attr_init,
+       sdb_attr_destroy
+};
 
 /*
- * public API
+ * private helper functions
  */
 
-sc_host_t *
-sc_host_create(const char *name)
+static sdb_store_obj_t *
+sdb_store_lookup_in_list(sdb_llist_t *l, int type, const char *name)
 {
-       sc_object_t *obj;
+       sdb_llist_iter_t *iter;
 
-       if (! name)
+       if (! l)
                return NULL;
 
-       obj = sc_object_create(sizeof(sc_host_t), sc_host_init,
-                       sc_host_destroy, name);
-       if (! obj)
+       iter = sdb_llist_get_iter(l);
+       if (! iter)
                return NULL;
-       return SC_HOST(obj);
-} /* sc_host_create */
 
-sc_host_t *
-sc_host_clone(const sc_host_t *host)
-{
-       sc_host_t *clone;
+       while (sdb_llist_iter_has_next(iter)) {
+               sdb_store_obj_t *sobj = SDB_STORE_OBJ(sdb_llist_iter_get_next(iter));
+               assert(sobj);
 
-       clone = sc_host_create(host->host_name);
-       if (! clone)
-               return NULL;
+               if ((sobj->type == type)
+                               && (! strcasecmp(SDB_OBJ(sobj)->name, name))) {
+                       sdb_llist_iter_destroy(iter);
+                       return sobj;
+               }
 
-       clone->host_last_update = host->host_last_update;
-       if (host->services) {
-               clone->services = sc_llist_clone(host->services);
-               if (! clone->services) {
-                       sc_object_deref(SC_OBJ(clone));
-                       return NULL;
+               sobj = sdb_store_lookup_in_list(sobj->children, type, name);
+               if (sobj) {
+                       sdb_llist_iter_destroy(iter);
+                       return sobj;
                }
        }
-       else
-               clone->services = NULL;
-       return clone;
-} /* sc_host_clone */
+       sdb_llist_iter_destroy(iter);
+       return NULL;
+} /* sdb_store_lookup_in_list */
 
-int
-sc_store_host(const sc_host_t *host)
+static sdb_store_obj_t *
+sdb_store_lookup(int type, const char *name)
 {
-       sc_store_lookup_obj_t lookup = SC_STORE_LOOKUP_OBJ_INIT;
-       sc_time_t last_update;
+       return sdb_store_lookup_in_list(obj_list, type, name);
+} /* sdb_store_lookup */
 
-       sc_host_t *old;
-       int status = 0;
+/* The obj_lock has to be acquired before calling this function. */
+static int
+store_obj(int parent_type, const char *parent_name,
+               int type, const char *name, sdb_time_t last_update,
+               store_obj_t **updated_obj)
+{
+       char *parent_cname = NULL, *cname = NULL;
 
-       if ((! host) || (! host->host_name))
-               return -1;
+       sdb_llist_t *parent_list;
+       store_obj_t *old;
+       int status = 0;
 
-       last_update = host->host_last_update;
        if (last_update <= 0)
-               last_update = sc_gettime();
-
-       pthread_rwlock_wrlock(&host_lock);
+               last_update = sdb_gettime();
+
+       assert((parent_type == 0)
+                       || (parent_type == SDB_HOST)
+                       || (parent_type == SDB_SERVICE));
+       assert((type == 0)
+                       || (type == SDB_HOST)
+                       || (type == SDB_SERVICE)
+                       || (type == SDB_ATTRIBUTE));
+
+       if (parent_type == SDB_HOST) {
+               parent_cname = sdb_plugin_cname(strdup(parent_name));
+               if (! parent_cname) {
+                       sdb_log(SDB_LOG_ERR, "store: strdup failed");
+                       return -1;
+               }
+               parent_name = parent_cname;
+       }
+       if (type == SDB_HOST) {
+               cname = sdb_plugin_cname(strdup(name));
+               if (! cname) {
+                       sdb_log(SDB_LOG_ERR, "store: strdup failed");
+                       return -1;
+               }
+               name = cname;
+       }
 
-       if (! host_list) {
-               if (! (host_list = sc_llist_create())) {
-                       pthread_rwlock_unlock(&host_lock);
+       if (! obj_list) {
+               if (! (obj_list = sdb_llist_create())) {
+                       free(parent_cname);
+                       free(cname);
                        return -1;
                }
        }
+       parent_list = obj_list;
+
+       if (parent_type && parent_name) {
+               sdb_store_obj_t *parent;
+
+               parent = sdb_store_lookup(parent_type, parent_name);
+               if (! parent) {
+                       sdb_log(SDB_LOG_ERR, "store: Failed to store %s '%s' - "
+                                       "parent %s '%s' not found", TYPE_TO_NAME(type), name,
+                                       TYPE_TO_NAME(parent_type), parent_name);
+                       free(parent_cname);
+                       free(cname);
+                       return -1;
+               }
+
+               if (type == SDB_ATTRIBUTE)
+                       parent_list = parent->attributes;
+               else
+                       parent_list = parent->children;
+       }
 
-       lookup.obj_name = host->host_name;
-       old = SC_HOST(sc_llist_search(host_list, (const sc_object_t *)&lookup,
-                               sc_cmp_store_obj_with_name));
+       /* TODO: only look into direct children? */
+       if (type == SDB_HOST)
+               /* make sure that each host is unique */
+               old = STORE_OBJ(sdb_store_lookup_in_list(obj_list, type, name));
+       else if (type == SDB_ATTRIBUTE)
+               old = STORE_OBJ(sdb_llist_search_by_name(parent_list, name));
+       else
+               old = STORE_OBJ(sdb_store_lookup_in_list(parent_list, type, name));
 
        if (old) {
-               if (old->host_last_update > last_update) {
-                       fprintf(stderr, "store: Cannot update host '%s' - "
-                                       "value too old (%"PRIscTIME" < %"PRIscTIME")\n",
-                                       host->host_name, last_update, old->host_last_update);
-                       /* don't report an error; the host may be updated by multiple
+               if (old->last_update > last_update) {
+                       sdb_log(SDB_LOG_DEBUG, "store: Cannot update %s '%s' - "
+                                       "value too old (%"PRIscTIME" < %"PRIscTIME")",
+                                       TYPE_TO_NAME(type), name, last_update, old->last_update);
+                       /* don't report an error; the object may be updated by multiple
                         * backends */
                        status = 1;
                }
                else {
-                       old->host_last_update = last_update;
+                       old->last_update = last_update;
                }
+
+               if (updated_obj)
+                       *updated_obj = old;
        }
        else {
-               sc_host_t *new = sc_host_clone(host);
+               store_obj_t *new;
+
+               if (type == SDB_ATTRIBUTE)
+                       /* the value will be updated by the caller */
+                       new = STORE_OBJ(sdb_object_create(name, sdb_attribute_type,
+                                               last_update, NULL));
+               else
+                       new = STORE_OBJ(sdb_object_create(name, sdb_store_obj_type,
+                                               last_update, type));
+
                if (! new) {
                        char errbuf[1024];
-                       fprintf(stderr, "store: Failed to clone host object: %s\n",
-                                       sc_strerror(errno, errbuf, sizeof(errbuf)));
+                       sdb_log(SDB_LOG_ERR, "store: Failed to create %s '%s': %s",
+                                       TYPE_TO_NAME(type), name,
+                                       sdb_strerror(errno, errbuf, sizeof(errbuf)));
+                       free(parent_cname);
+                       free(cname);
                        return -1;
                }
 
-               if (! new->services) {
-                       if (! (new->services = sc_llist_create())) {
-                               char errbuf[1024];
-                               fprintf(stderr, "store: Failed to initialize "
-                                               "host object '%s': %s\n", host->host_name,
-                                               sc_strerror(errno, errbuf, sizeof(errbuf)));
-                               sc_object_deref(SC_OBJ(new));
-                               return -1;
-                       }
-               }
-
-               status = sc_llist_insert_sorted(host_list, SC_OBJ(new),
-                               sc_store_obj_cmp_by_name);
+               /* TODO: insert type-aware; the current version works as long as we
+                * don't support to store hierarchical data */
+               status = sdb_llist_insert_sorted(parent_list, SDB_OBJ(new),
+                               sdb_object_cmp_by_name);
 
                /* pass control to the list or destroy in case of an error */
-               sc_object_deref(SC_OBJ(new));
-       }
+               sdb_object_deref(SDB_OBJ(new));
 
-       pthread_rwlock_unlock(&host_lock);
+               if (updated_obj)
+                       *updated_obj = new;
+       }
+       free(parent_cname);
+       free(cname);
        return status;
-} /* sc_store_host */
+} /* sdb_store_obj */
 
-const sc_host_t *
-sc_store_get_host(const char *name)
-{
-       sc_store_lookup_obj_t lookup = SC_STORE_LOOKUP_OBJ_INIT;
-       sc_host_t *host;
-
-       if (! name)
-               return NULL;
-
-       lookup.obj_name = name;
-       host = SC_HOST(sc_llist_search(host_list, (const sc_object_t *)&lookup,
-                               sc_cmp_store_obj_with_name));
-
-       if (! host)
-               return NULL;
-       return host;
-} /* sc_store_get_host */
+/*
+ * public API
+ */
 
-sc_service_t *
-sc_service_create(const char *hostname, const char *name)
+int
+sdb_store_host(const char *name, sdb_time_t last_update)
 {
-       sc_object_t *obj;
+       int status;
 
-       if ((! hostname) || (! name))
-               return NULL;
+       if (! name)
+               return -1;
 
-       obj = sc_object_create(sizeof(sc_service_t), sc_svc_init,
-                       sc_svc_destroy, hostname, name);
-       if (! obj)
-               return NULL;
-       return SC_SVC(obj);
-} /* sc_service_create */
+       pthread_rwlock_wrlock(&obj_lock);
+       status = store_obj(/* parent = */ 0, NULL,
+                       /* stored object = */ SDB_HOST, name, last_update,
+                       /* updated_obj = */ NULL);
+       pthread_rwlock_unlock(&obj_lock);
+       return status;
+} /* sdb_store_host */
 
-sc_service_t *
-sc_service_clone(const sc_service_t *svc)
+_Bool
+sdb_store_has_host(const char *name)
 {
-       sc_service_t *clone;
+       sdb_store_obj_t *host;
 
-       clone = sc_service_create(svc->hostname, svc->svc_name);
-       if (! clone)
+       if (! name)
                return NULL;
 
-       clone->svc_last_update = svc->svc_last_update;
-       return clone;
-} /* sc_service_clone */
+       host = sdb_store_lookup(SDB_HOST, name);
+       return host != NULL;
+} /* sdb_store_has_host */
 
 int
-sc_store_service(const sc_service_t *svc)
+sdb_store_attribute(const char *hostname, const char *key, const char *value,
+               sdb_time_t last_update)
 {
-       sc_store_lookup_obj_t lookup = SC_STORE_LOOKUP_OBJ_INIT;
-       sc_host_t *host;
+       int status;
 
-       sc_service_t *old;
+       store_obj_t *updated_attr = NULL;
 
-       sc_time_t last_update;
-
-       int status = 0;
-
-       if (! svc)
-               return -1;
-
-       last_update = svc->svc_last_update;
-       if (last_update <= 0)
-               last_update = sc_gettime();
-
-       if (! host_list)
+       if ((! hostname) || (! key))
                return -1;
 
-       pthread_rwlock_wrlock(&host_lock);
-
-       lookup.obj_name = svc->hostname;
-       host = SC_HOST(sc_llist_search(host_list, (const sc_object_t *)&lookup,
-                               sc_cmp_store_obj_with_name));
-
-       if (! host)
-               return -1;
-
-       lookup.obj_name = svc->svc_name;
-       old = SC_SVC(sc_llist_search(host->services, (const sc_object_t *)&lookup,
-                               sc_cmp_store_obj_with_name));
-
-       if (old) {
-               if (old->host_last_update > last_update) {
-                       fprintf(stderr, "store: Cannot update service '%s/%s' - "
-                                       "value too old (%"PRIscTIME" < %"PRIscTIME")\n",
-                                       svc->hostname, svc->svc_name, last_update,
-                                       old->host_last_update);
-                       status = 1;
-               }
-               else {
-                       old->svc_last_update = last_update;
+       pthread_rwlock_wrlock(&obj_lock);
+       status = store_obj(/* parent = */ SDB_HOST, hostname,
+                       /* stored object = */ SDB_ATTRIBUTE, key, last_update,
+                       &updated_attr);
+
+       if (status >= 0) {
+               assert(updated_attr);
+               SDB_ATTR(updated_attr)->value = strdup(value);
+               if (! SDB_ATTR(updated_attr)->value) {
+                       sdb_object_deref(SDB_OBJ(updated_attr));
+                       status = -1;
                }
        }
-       else {
-               sc_service_t *new = sc_service_clone(svc);
-               if (! new) {
-                       char errbuf[1024];
-                       fprintf(stderr, "store: Failed to clone service object: %s\n",
-                                       sc_strerror(errno, errbuf, sizeof(errbuf)));
-                       return -1;
-               }
 
-               status = sc_llist_insert_sorted(host->services, SC_OBJ(new),
-                               sc_store_obj_cmp_by_name);
-
-               /* pass control to the list or destroy in case of an error */
-               sc_object_deref(SC_OBJ(new));
-       }
-
-       pthread_rwlock_unlock(&host_lock);
+       pthread_rwlock_unlock(&obj_lock);
        return status;
-} /* sc_store_service */
+} /* sdb_store_attribute */
 
-const sc_service_t *
-sc_store_get_service(const sc_host_t *host, const char *name)
+int
+sdb_store_service(const char *hostname, const char *name,
+               sdb_time_t last_update)
 {
-       sc_store_lookup_obj_t lookup = SC_STORE_LOOKUP_OBJ_INIT;
-       sc_service_t *svc;
+       int status;
 
-       if ((! host) || (! name))
-               return NULL;
-
-       lookup.obj_name = name;
-       svc = SC_SVC(sc_llist_search(host->services, (const sc_object_t *)&lookup,
-                               sc_cmp_store_obj_with_name));
+       if ((! hostname) || (! name))
+               return -1;
 
-       if (! svc)
-               return NULL;
-       return svc;
-} /* sc_store_get_service */
+       pthread_rwlock_wrlock(&obj_lock);
+       status = store_obj(/* parent = */ SDB_HOST, hostname,
+                       /* stored object = */ SDB_SERVICE, name, last_update,
+                       /* updated obj = */ NULL);
+       pthread_rwlock_unlock(&obj_lock);
+       return status;
+} /* sdb_store_service */
 
+/* TODO: actually support hierarchical data */
 int
-sc_store_dump(FILE *fh)
+sdb_store_tojson(sdb_strbuf_t *buf)
 {
-       sc_llist_iter_t *host_iter;
+       sdb_llist_iter_t *host_iter;
 
-       if (! fh)
+       if (! buf)
                return -1;
 
-       pthread_rwlock_rdlock(&host_lock);
+       pthread_rwlock_rdlock(&obj_lock);
 
-       host_iter = sc_llist_get_iter(host_list);
-       if (! host_iter)
+       host_iter = sdb_llist_get_iter(obj_list);
+       if (! host_iter) {
+               pthread_rwlock_unlock(&obj_lock);
                return -1;
+       }
+
+       sdb_strbuf_append(buf, "{\"hosts\":[");
 
-       while (sc_llist_iter_has_next(host_iter)) {
-               sc_host_t *host = SC_HOST(sc_llist_iter_get_next(host_iter));
-               sc_llist_iter_t *svc_iter;
+       while (sdb_llist_iter_has_next(host_iter)) {
+               sdb_store_obj_t *host = SDB_STORE_OBJ(sdb_llist_iter_get_next(host_iter));
+               sdb_llist_iter_t *svc_iter;
+               sdb_llist_iter_t *attr_iter;
 
                char time_str[64];
 
                assert(host);
 
-               if (! sc_strftime(time_str, sizeof(time_str),
-                                       "%F %T %z", host->host_last_update))
+               if (! sdb_strftime(time_str, sizeof(time_str),
+                                       "%F %T %z", host->_last_update))
                        snprintf(time_str, sizeof(time_str), "<error>");
                time_str[sizeof(time_str) - 1] = '\0';
 
-               fprintf(fh, "Host '%s' (last updated: %s):\n",
-                               host->host_name, time_str);
+               sdb_strbuf_append(buf, "{\"name\": \"%s\", "
+                               "\"last_update\": \"%s\", "
+                               "\"attributes\": [",
+                               SDB_OBJ(host)->name, time_str);
+
+               attr_iter = sdb_llist_get_iter(host->attributes);
+               if (! attr_iter) {
+                       char errbuf[1024];
+                       sdb_log(SDB_LOG_ERR, "store: Failed to retrieve attributes: %s\n",
+                                       sdb_strerror(errno, errbuf, sizeof(errbuf)));
+                       sdb_strbuf_append(buf, "{\"error\": \"failed to retrieve "
+                                       "attributes: %s\"}", errbuf);
+               }
+
+               /* has_next returns false if the iterator is NULL */
+               while (sdb_llist_iter_has_next(attr_iter)) {
+                       sdb_attribute_t *attr = SDB_ATTR(sdb_llist_iter_get_next(attr_iter));
+                       assert(attr);
 
-               svc_iter = sc_llist_get_iter(host->services);
+                       if (! sdb_strftime(time_str, sizeof(time_str),
+                                               "%F %T %z", attr->_last_update))
+                               snprintf(time_str, sizeof(time_str), "<error>");
+                       time_str[sizeof(time_str) - 1] = '\0';
+
+                       sdb_strbuf_append(buf, "{\"name\": \"%s\", "
+                                       "\"value\": \"%s\", \"last_update\": \"%s\"},",
+                                       SDB_OBJ(attr)->name, attr->value, time_str);
+               }
+
+               sdb_llist_iter_destroy(attr_iter);
+               sdb_strbuf_append(buf, "], \"services\": [");
+
+               svc_iter = sdb_llist_get_iter(host->children);
                if (! svc_iter) {
                        char errbuf[1024];
-                       fprintf(fh, "Failed to retrieve services: %s\n",
-                                       sc_strerror(errno, errbuf, sizeof(errbuf)));
-                       continue;
+                       sdb_log(SDB_LOG_ERR, "store: Failed to retrieve services: %s\n",
+                                       sdb_strerror(errno, errbuf, sizeof(errbuf)));
+                       sdb_strbuf_append(buf, "{\"error\": \"failed to retrieve "
+                                       "services: %s\"}", errbuf);
                }
 
-               while (sc_llist_iter_has_next(svc_iter)) {
-                       sc_service_t *svc = SC_SVC(sc_llist_iter_get_next(svc_iter));
+               while (sdb_llist_iter_has_next(svc_iter)) {
+                       sdb_store_obj_t *svc = SDB_STORE_OBJ(sdb_llist_iter_get_next(svc_iter));
                        assert(svc);
 
-                       if (! sc_strftime(time_str, sizeof(time_str),
-                                               "%F %T %z", host->host_last_update))
+                       if (! sdb_strftime(time_str, sizeof(time_str),
+                                               "%F %T %z", svc->_last_update))
                                snprintf(time_str, sizeof(time_str), "<error>");
                        time_str[sizeof(time_str) - 1] = '\0';
 
-                       fprintf(fh, "\tService '%s' (last updated: %s)\n",
-                                       svc->svc_name, time_str);
+                       sdb_strbuf_append(buf, "{\"name\": \"%s\", "
+                                       "\"last_update\": \"%s\"},",
+                                       SDB_OBJ(svc)->name, time_str);
                }
 
-               sc_llist_iter_destroy(svc_iter);
+               sdb_llist_iter_destroy(svc_iter);
+               sdb_strbuf_append(buf, "]},");
        }
 
-       sc_llist_iter_destroy(host_iter);
+       sdb_strbuf_append(buf, "]}");
+
+       sdb_llist_iter_destroy(host_iter);
+       pthread_rwlock_unlock(&obj_lock);
        return 0;
-} /* sc_store_dump */
+} /* sdb_store_tojson */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */