X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fcore%2Fstore.c;h=df8c02fb152a87135c4f44464476d8d8096d5361;hb=703c09231bca96e2e5d680ead4b471ec9e276ef5;hp=162a3fc2d7c736d97c5bd406e609a130f6ff2228;hpb=d170cd34bb8b4f135ec41c622e6a09ff83ff1011;p=sysdb.git

diff --git a/src/core/store.c b/src/core/store.c
index 162a3fc..df8c02f 100644
--- a/src/core/store.c
+++ b/src/core/store.c
@@ -1,6 +1,6 @@
 /*
- * syscollector - src/core/store.c
- * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
+ * SysDB - src/core/store.c
+ * Copyright (C) 2012-2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -25,10 +25,15 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "syscollector.h"
-#include "core/store.h"
+#if HAVE_CONFIG_H
+#	include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include "sysdb.h"
+#include "core/store-private.h"
+#include "core/plugin.h"
+#include "utils/error.h"
 #include "utils/llist.h"
-#include "utils/string.h"
 
 #include <assert.h>
 
@@ -44,379 +49,571 @@
  * private variables
  */
 
-static sc_llist_t *host_list = NULL;
-static pthread_rwlock_t host_lock = PTHREAD_RWLOCK_INITIALIZER;
+static sdb_llist_t *obj_list = NULL;
+static pthread_rwlock_t obj_lock = PTHREAD_RWLOCK_INITIALIZER;
 
 /*
- * private helper functions
+ * private types
  */
 
+static sdb_type_t sdb_store_obj_type;
+static sdb_type_t sdb_attribute_type;
+
 static int
-sc_store_obj_cmp_by_name(const sc_object_t *a, const sc_object_t *b)
+store_base_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;
+	sdb_store_base_t *sobj = STORE_BASE(obj);
 
-	assert(h1 && h2);
-	return strcasecmp(h1->name, h2->name);
-} /* sc_store_obj_cmp_by_name */
+	sobj->type = va_arg(ap, int);
 
-static int
-sc_host_init(sc_object_t *obj, va_list ap)
+	sobj->last_update = va_arg(ap, sdb_time_t);
+	sobj->interval = 0;
+	sobj->parent = NULL;
+	return 0;
+} /* store_base_init */
+
+static void
+store_base_destroy(sdb_object_t *obj)
 {
-	char *name = va_arg(ap, char *);
+	const sdb_store_base_t *sobj = STORE_CONST_BASE(obj);
 
-	SC_HOST(obj)->host_name = strdup(name);
-	if (! SC_HOST(obj)->host_name)
-		return -1;
+	if (sobj->parent)
+		sdb_object_deref(SDB_OBJ(sobj->parent));
+} /* store_base_destroy */
 
-	SC_HOST(obj)->host_last_update = sc_gettime();
-	/* ignore errors -> last_update will be updated later */
+static int
+sdb_store_obj_init(sdb_object_t *obj, va_list ap)
+{
+	sdb_store_obj_t *sobj = SDB_STORE_OBJ(obj);
+	int ret;
 
-	SC_HOST(obj)->services = sc_llist_create();
-	if (! SC_HOST(obj)->services)
+	/* this will consume the first argument (type) of ap */
+	ret = store_base_init(obj, ap);
+	if (ret)
+		return ret;
+
+	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_base_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)
 {
-	char *hostname = va_arg(ap, char *);
-	char *name = va_arg(ap, char *);
-
-	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;
-
-	SC_SVC(obj)->svc_last_update = sc_gettime();
-	/* ignore errors -> last_update will be updated later */
+	const sdb_data_t *value;
+	int ret;
+
+	/* this will consume the first two arguments
+	 * (type and last_update) of ap */
+	ret = store_base_init(obj, ap);
+	if (ret)
+		return ret;
+	value = va_arg(ap, const sdb_data_t *);
+
+	if (value)
+		if (sdb_data_copy(&SDB_ATTR(obj)->value, 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_base_destroy(obj);
+	sdb_data_free_datum(&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(char *name)
+static sdb_store_obj_t *
+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 ((STORE_BASE(sobj)->type == type)
+				&& (! strcasecmp(SDB_OBJ(sobj)->name, name))) {
+			sdb_llist_iter_destroy(iter);
+			return sobj;
+		}
+
+		/* don't lookups non-host types from hierarchical hosts */
+		if ((type != SDB_HOST) && (STORE_BASE(sobj)->type == SDB_HOST))
+			continue;
 
-	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 = 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;
+} /* store_lookup_in_list */
 
-int
-sc_store_host(const sc_host_t *host)
+static sdb_store_obj_t *
+store_lookup(int type, const char *name)
 {
-	sc_time_t last_update;
+	return store_lookup_in_list(obj_list, type, name);
+} /* 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,
+		sdb_store_base_t **updated_obj)
+{
+	char *parent_cname = NULL, *cname = NULL;
 
-	if ((! host) || (! host->host_name))
-		return -1;
+	sdb_llist_t *parent_list;
+	sdb_store_base_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 = store_lookup(parent_type, parent_name);
+		if (! parent) {
+			sdb_log(SDB_LOG_ERR, "store: Failed to store %s '%s' - "
+					"parent %s '%s' not found", SDB_STORE_TYPE_TO_NAME(type),
+					name, SDB_STORE_TYPE_TO_NAME(parent_type), parent_name);
+			free(parent_cname);
+			free(cname);
+			return -1;
+		}
 
-	old = SC_HOST(sc_llist_search(host_list, (const sc_object_t *)host,
-				sc_store_obj_cmp_by_name));
+		if (type == SDB_ATTRIBUTE)
+			parent_list = parent->attributes;
+		else
+			parent_list = parent->children;
+	}
+
+	if (type == SDB_HOST)
+		/* make sure that each host is unique */
+		old = STORE_BASE(store_lookup_in_list(obj_list, type, name));
+	else if (type == SDB_ATTRIBUTE)
+		/* look into attributes of this host */
+		old = STORE_BASE(sdb_llist_search_by_name(parent_list, name));
+	else
+		/* look into services assigned to this host (store_lookup_in_list
+		 * does not look up services from hierarchical hosts) */
+		old = STORE_BASE(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")",
+					SDB_STORE_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;
+			sdb_time_t interval = last_update - old->last_update;
+			old->last_update = last_update;
+			if (interval) {
+				if (old->interval)
+					old->interval = (sdb_time_t)((0.9 * (double)old->interval)
+							+ (0.1 * (double)interval));
+				else
+					old->interval = interval;
+			}
 		}
+
+		if (updated_obj)
+			*updated_obj = old;
 	}
 	else {
-		sc_host_t *new = sc_host_clone(host);
+		sdb_store_base_t *new;
+
+		if (type == SDB_ATTRIBUTE)
+			/* the value will be updated by the caller */
+			new = STORE_BASE(sdb_object_create(name, sdb_attribute_type,
+						type, last_update, NULL));
+		else
+			new = STORE_BASE(sdb_object_create(name, sdb_store_obj_type,
+						type, last_update));
+
 		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",
+					SDB_STORE_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 */
+} /* store_obj */
 
-const sc_host_t *
-sc_store_get_host(char *name)
+/*
+ * store_obj_tojson serializes attribute / service objects to JSON.
+ *
+ * The function never returns an error. Rather, an error message will be part
+ * of the serialized data.
+ */
+static void
+store_obj_tojson(sdb_llist_t *list, int type, sdb_strbuf_t *buf)
 {
-	sc_host_t  tmp = SC_HOST_INIT;
-	sc_host_t *host;
+	sdb_llist_iter_t *iter;
+	char time_str[64];
+	char interval_str[64];
+
+	assert((type == SDB_ATTRIBUTE) || (type == SDB_SERVICE));
+
+	sdb_strbuf_append(buf, "[");
+
+	iter = sdb_llist_get_iter(list);
+	if (! iter) {
+		char errbuf[1024];
+		sdb_log(SDB_LOG_ERR, "store: Failed to retrieve %ss: %s\n",
+				SDB_STORE_TYPE_TO_NAME(type),
+				sdb_strerror(errno, errbuf, sizeof(errbuf)));
+		sdb_strbuf_append(buf, "{\"error\": \"failed to retrieve %ss: %s\"}",
+				SDB_STORE_TYPE_TO_NAME(type), errbuf);
+	}
 
-	if (! name)
-		return NULL;
+	/* has_next returns false if the iterator is NULL */
+	while (sdb_llist_iter_has_next(iter)) {
+		sdb_store_base_t *sobj = STORE_BASE(sdb_llist_iter_get_next(iter));
+		assert(sobj);
 
-	tmp.host_name = name;
-	host = SC_HOST(sc_llist_search(host_list, (const sc_object_t *)&tmp,
-				sc_store_obj_cmp_by_name));
+		if (! sdb_strftime(time_str, sizeof(time_str),
+					"%F %T %z", sobj->last_update))
+			snprintf(time_str, sizeof(time_str), "<error>");
+		time_str[sizeof(time_str) - 1] = '\0';
 
-	if (! host)
-		return NULL;
-	return host;
-} /* sc_store_get_host */
+		if (! sdb_strfinterval(interval_str, sizeof(interval_str),
+					sobj->interval))
+			snprintf(interval_str, sizeof(interval_str), "<error>");
+		interval_str[sizeof(interval_str) - 1] = '\0';
+
+		sdb_strbuf_append(buf, "{\"name\": \"%s\", ", SDB_OBJ(sobj)->name);
+		if (type == SDB_ATTRIBUTE) {
+			char tmp[sdb_data_strlen(&SDB_ATTR(sobj)->value) + 1];
+			sdb_data_format(&SDB_ATTR(sobj)->value, tmp, sizeof(tmp),
+					SDB_DOUBLE_QUOTED);
+			sdb_strbuf_append(buf, "\"value\": %s, \"last_update\": \"%s\", "
+					"\"update_interval\": \"%s\"}", tmp, time_str,
+					interval_str);
+		}
+		else
+			sdb_strbuf_append(buf, "\"last_update\": \"%s\", "
+					"\"update_interval\": \"%s\"}", time_str, interval_str);
 
-sc_service_t *
-sc_service_create(char *hostname, char *name)
-{
-	sc_object_t *obj;
+		if (sdb_llist_iter_has_next(iter))
+			sdb_strbuf_append(buf, ",");
+	}
 
-	if ((! hostname) || (! name))
-		return NULL;
+	sdb_llist_iter_destroy(iter);
+	sdb_strbuf_append(buf, "]");
+} /* store_obj_tojson */
 
-	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 */
+/*
+ * public API
+ */
 
-sc_service_t *
-sc_service_clone(const sc_service_t *svc)
+void
+sdb_store_clear(void)
 {
-	sc_service_t *clone;
+	sdb_llist_destroy(obj_list);
+	obj_list = NULL;
+} /* sdb_store_clear */
 
-	clone = sc_service_create(svc->hostname, svc->svc_name);
-	if (! clone)
-		return NULL;
+int
+sdb_store_host(const char *name, sdb_time_t last_update)
+{
+	int status;
+
+	if (! name)
+		return -1;
 
-	clone->svc_last_update = svc->svc_last_update;
-	return clone;
-} /* sc_service_clone */
+	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 */
 
-int
-sc_store_service(const sc_service_t *svc)
+_Bool
+sdb_store_has_host(const char *name)
 {
-	sc_host_t  tmp = SC_HOST_INIT;
-	sc_host_t *host;
+	sdb_store_obj_t *host;
 
-	sc_service_t *old;
+	if (! name)
+		return NULL;
 
-	sc_time_t last_update;
+	host = store_lookup(SDB_HOST, name);
+	return host != NULL;
+} /* sdb_store_has_host */
 
-	int status = 0;
+sdb_store_base_t *
+sdb_store_get_host(const char *name)
+{
+	sdb_store_obj_t *host;
 
-	if (! svc)
-		return -1;
+	if (! name)
+		return NULL;
 
-	last_update = svc->svc_last_update;
-	if (last_update <= 0)
-		last_update = sc_gettime();
+	host = store_lookup(SDB_HOST, name);
+	if (! host)
+		return NULL;
 
-	if (! host_list)
-		return -1;
+	sdb_object_ref(SDB_OBJ(host));
+	return STORE_BASE(host);
+} /* sdb_store_get_host */
 
-	pthread_rwlock_wrlock(&host_lock);
+int
+sdb_store_attribute(const char *hostname,
+		const char *key, const sdb_data_t *value,
+		sdb_time_t last_update)
+{
+	int status;
 
-	tmp.host_name = svc->hostname;
-	host = SC_HOST(sc_llist_search(host_list, (const sc_object_t *)&tmp,
-				sc_store_obj_cmp_by_name));
+	sdb_store_base_t *updated_attr = NULL;
 
-	if (! host)
+	if ((! hostname) || (! key))
 		return -1;
 
-	old = SC_SVC(sc_llist_search(host->services, (const sc_object_t *)svc,
-				sc_store_obj_cmp_by_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_data_free_datum(&SDB_ATTR(updated_attr)->value);
+		if (sdb_data_copy(&SDB_ATTR(updated_attr)->value, 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);
+	pthread_rwlock_unlock(&obj_lock);
+	return status;
+} /* sdb_store_attribute */
 
-		/* pass control to the list or destroy in case of an error */
-		sc_object_deref(SC_OBJ(new));
-	}
+int
+sdb_store_service(const char *hostname, const char *name,
+		sdb_time_t last_update)
+{
+	int status;
 
-	pthread_rwlock_unlock(&host_lock);
+	if ((! hostname) || (! name))
+		return -1;
+
+	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;
-} /* sc_store_service */
+} /* sdb_store_service */
 
-const sc_service_t *
-sc_store_get_service(const sc_host_t *host, char *name)
+int
+sdb_store_host_tojson(sdb_store_base_t *h, sdb_strbuf_t *buf, int flags)
 {
-	sc_service_t  tmp = SC_SVC_INIT;
-	sc_service_t *svc;
+	sdb_store_obj_t *host;
+	char time_str[64];
+	char interval_str[64];
 
-	if ((! host) || (! name))
-		return NULL;
+	if ((! h) || (h->type != SDB_HOST) || (! buf))
+		return -1;
 
-	tmp.svc_name = name;
-	svc = SC_SVC(sc_llist_search(host->services, (const sc_object_t *)&tmp,
-				sc_store_obj_cmp_by_name));
+	host = SDB_STORE_OBJ(h);
 
-	if (! svc)
-		return NULL;
-	return svc;
-} /* sc_store_get_service */
+	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';
+
+	if (! sdb_strfinterval(interval_str, sizeof(interval_str),
+				host->_interval))
+		snprintf(interval_str, sizeof(interval_str), "<error>");
+	interval_str[sizeof(interval_str) - 1] = '\0';
+
+	sdb_strbuf_append(buf, "{\"name\": \"%s\", "
+			"\"last_update\": \"%s\", \"update_interval\": \"%s\"",
+			SDB_OBJ(host)->name, time_str, interval_str);
+
+	if (! (flags & SDB_SKIP_ATTRIBUTES)) {
+		sdb_strbuf_append(buf, ", \"attributes\": ");
+		store_obj_tojson(host->attributes, SDB_ATTRIBUTE, buf);
+	}
+
+	if (! (flags & SDB_SKIP_SERVICES)) {
+		sdb_strbuf_append(buf, ", \"services\": ");
+		store_obj_tojson(host->children, SDB_SERVICE, buf);
+	}
+
+	sdb_strbuf_append(buf, "}");
+	return 0;
+} /* sdb_store_host_tojson */
 
 int
-sc_store_dump(FILE *fh)
+sdb_store_tojson(sdb_strbuf_t *buf, int flags)
 {
-	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;
+	}
 
-	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;
-
-		char time_str[64];
+	sdb_strbuf_append(buf, "{\"hosts\":[");
 
+	while (sdb_llist_iter_has_next(host_iter)) {
+		sdb_store_base_t *host = STORE_BASE(sdb_llist_iter_get_next(host_iter));
 		assert(host);
 
-		if (! sc_strftime(time_str, sizeof(time_str),
-					"%F %T %z", host->host_last_update))
-			snprintf(time_str, sizeof(time_str), "<error>");
-		time_str[sizeof(time_str) - 1] = '\0';
+		if (sdb_store_host_tojson(host, buf, flags))
+			return -1;
 
-		fprintf(fh, "Host '%s' (last updated: %s):\n",
-				host->host_name, time_str);
+		if (sdb_llist_iter_has_next(host_iter))
+			sdb_strbuf_append(buf, ",");
+	}
 
-		svc_iter = sc_llist_get_iter(host->services);
-		if (! svc_iter) {
-			char errbuf[1024];
-			fprintf(fh, "Failed to retrieve services: %s\n",
-					sc_strerror(errno, errbuf, sizeof(errbuf)));
-			continue;
-		}
+	sdb_strbuf_append(buf, "]}");
+
+	sdb_llist_iter_destroy(host_iter);
+	pthread_rwlock_unlock(&obj_lock);
+	return 0;
+} /* sdb_store_tojson */
+
+/* TODO: actually support hierarchical data */
+int
+sdb_store_iterate(sdb_store_iter_cb cb, void *user_data)
+{
+	sdb_llist_iter_t *host_iter;
+	int status = 0;
 
-		while (sc_llist_iter_has_next(svc_iter)) {
-			sc_service_t *svc = SC_SVC(sc_llist_iter_get_next(svc_iter));
-			assert(svc);
+	pthread_rwlock_rdlock(&obj_lock);
 
-			if (! sc_strftime(time_str, sizeof(time_str),
-						"%F %T %z", host->host_last_update))
-				snprintf(time_str, sizeof(time_str), "<error>");
-			time_str[sizeof(time_str) - 1] = '\0';
+	host_iter = sdb_llist_get_iter(obj_list);
+	if (! host_iter)
+		status = -1;
 
-			fprintf(fh, "\tService '%s' (last updated: %s)\n",
-					svc->svc_name, time_str);
-		}
+	/* has_next returns false if the iterator is NULL */
+	while (sdb_llist_iter_has_next(host_iter)) {
+		sdb_store_base_t *host = STORE_BASE(sdb_llist_iter_get_next(host_iter));
+		assert(host);
 
-		sc_llist_iter_destroy(svc_iter);
+		if (cb(host, user_data)) {
+			status = -1;
+			break;
+		}
 	}
 
-	sc_llist_iter_destroy(host_iter);
-	return 0;
-} /* sc_store_dump */
+	sdb_llist_iter_destroy(host_iter);
+	pthread_rwlock_unlock(&obj_lock);
+	return status;
+} /* sdb_store_iterate */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */