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diff --git a/src/core/store_json.c b/src/core/store_json.c
index a2c117b1f10d07308e7db9afd698c32933342e49..a069d8543872ea79e20edd8f31c0355f372488dd 100644 (file)
--- a/src/core/store_json.c
+++ b/src/core/store_json.c
/* destroy = */ NULL,
};
+/* A generic representation of a stored object. */
+typedef struct {
+ /* identifier */
+ int type;
+ const char *name;
+
+ /* attribute value (optional) */
+ sdb_data_t *value;
+
+ /* metric's timeseries (optional)
+ * -1: unset
+ * 0: false
+ * 1: true */
+ int timeseries;
+
+ /* generic meta-data */
+ sdb_time_t last_update;
+ sdb_time_t interval;
+ size_t backends_num;
+ const char * const *backends;
+} obj_t;
+
/*
* private helper functions
*/
* new object. That is, it manages context information and emit the prefix and
* suffix of an object. */
static int
-handle_new_object(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj)
+handle_new_object(sdb_store_json_formatter_t *f, int type)
{
/* first top-level object */
if (! f->context[0]) {
- if ((obj->type != f->type) && (obj->type != SDB_HOST)) {
+ if ((type != f->type) && (type != SDB_HOST)) {
sdb_log(SDB_LOG_ERR, "store: Unexpected object of type %s "
"as the first element during %s JSON serialization",
- SDB_STORE_TYPE_TO_NAME(obj->type),
+ SDB_STORE_TYPE_TO_NAME(type),
SDB_STORE_TYPE_TO_NAME(f->type));
return -1;
}
if (f->flags & SDB_WANT_ARRAY)
sdb_strbuf_append(f->buf, "[");
assert(f->current == 0);
- f->context[f->current] = obj->type;
+ f->context[f->current] = type;
return 0;
}
if ((f->context[f->current] != SDB_HOST)
- && (obj->type != SDB_ATTRIBUTE)) {
+ && (type != SDB_ATTRIBUTE)) {
/* new entry of the same type or a parent object;
* rewind to the right state */
while ((f->current > 0)
- && (f->context[f->current] != obj->type)) {
+ && (f->context[f->current] != type)) {
sdb_strbuf_append(f->buf, "}]");
--f->current;
}
}
- if (obj->type == f->context[f->current]) {
+ if (type == f->context[f->current]) {
/* new entry of the same type */
sdb_strbuf_append(f->buf, "},");
}
else if ((f->context[f->current] == SDB_HOST)
- || (obj->type == SDB_ATTRIBUTE)) {
- assert(obj->type != SDB_HOST);
+ || (type == SDB_ATTRIBUTE)) {
+ assert(type != SDB_HOST);
/* all object types may be children of a host;
* attributes may be children of any type */
sdb_strbuf_append(f->buf, ", \"%ss\": [",
- SDB_STORE_TYPE_TO_NAME(obj->type));
+ SDB_STORE_TYPE_TO_NAME(type));
++f->current;
}
else {
sdb_log(SDB_LOG_ERR, "store: Unexpected object of type %s "
"on level %zu during JSON serialization",
- SDB_STORE_TYPE_TO_NAME(obj->type), f->current);
+ SDB_STORE_TYPE_TO_NAME(type), f->current);
return -1;
}
assert(f->current < SDB_STATIC_ARRAY_LEN(f->context));
- f->context[f->current] = obj->type;
+ f->context[f->current] = type;
return 0;
} /* handle_new_object */
static int
-json_emit(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj)
+json_emit(sdb_store_json_formatter_t *f, obj_t *obj)
{
char time_str[64];
char interval_str[64];
- char name[2 * strlen(SDB_OBJ(obj)->name) + 3];
+ char name[2 * strlen(obj->name) + 3];
size_t i;
assert(f && obj);
- handle_new_object(f, obj);
+ handle_new_object(f, obj->type);
- escape_string(SDB_OBJ(obj)->name, name);
+ escape_string(obj->name, name);
sdb_strbuf_append(f->buf, "{\"name\": %s, ", name);
- if (obj->type == SDB_ATTRIBUTE) {
- char tmp[sdb_data_strlen(&ATTR(obj)->value) + 1];
+ if ((obj->type == SDB_ATTRIBUTE) && (obj->value)) {
+ char tmp[sdb_data_strlen(obj->value) + 1];
char val[2 * sizeof(tmp) + 3];
- if (! sdb_data_format(&ATTR(obj)->value, tmp, sizeof(tmp),
+ if (! sdb_data_format(obj->value, tmp, sizeof(tmp),
SDB_DOUBLE_QUOTED))
snprintf(tmp, sizeof(tmp), "<error>");
else
sdb_strbuf_append(f->buf, "\"value\": %s, ", tmp);
}
- else if (obj->type == SDB_METRIC) {
- if (METRIC(obj)->store.type != NULL)
+ else if ((obj->type == SDB_METRIC) && (obj->timeseries >= 0)) {
+ if (obj->timeseries)
sdb_strbuf_append(f->buf, "\"timeseries\": true, ");
else
sdb_strbuf_append(f->buf, "\"timeseries\": false, ");
return 0;
} /* json_emit */
+static int
+emit_host(sdb_store_host_t *host, sdb_object_t *user_data)
+{
+ sdb_store_json_formatter_t *f = F(user_data);
+
+ if ((! host) || (! user_data))
+ return -1;
+
+ {
+ obj_t o = {
+ SDB_HOST,
+ host->name,
+
+ /* value */ NULL,
+ /* timeseries */ -1,
+
+ host->last_update,
+ host->interval,
+ host->backends_num,
+ (const char * const *)host->backends,
+ };
+
+ return json_emit(f, &o);
+ }
+} /* emit_host */
+
+static int
+emit_service(sdb_store_service_t *service, sdb_object_t *user_data)
+{
+ sdb_store_json_formatter_t *f = F(user_data);
+
+ if ((! service) || (! user_data))
+ return -1;
+
+ {
+ obj_t o = {
+ SDB_SERVICE,
+ service->name,
+
+ /* value */ NULL,
+ /* timeseries */ -1,
+
+ service->last_update,
+ service->interval,
+ service->backends_num,
+ (const char * const *)service->backends,
+ };
+
+ return json_emit(f, &o);
+ }
+} /* emit_service */
+
+static int
+emit_metric(sdb_store_metric_t *metric, sdb_object_t *user_data)
+{
+ sdb_store_json_formatter_t *f = F(user_data);
+
+ if ((! metric) || (! user_data))
+ return -1;
+
+ {
+ obj_t o = {
+ SDB_METRIC,
+ metric->name,
+
+ /* value */ NULL,
+ /* timeseries */ metric->store.type != NULL,
+
+ metric->last_update,
+ metric->interval,
+ metric->backends_num,
+ (const char * const *)metric->backends,
+ };
+
+ return json_emit(f, &o);
+ }
+} /* emit_metric */
+
+static int
+emit_attribute(sdb_store_attribute_t *attr, sdb_object_t *user_data)
+{
+ sdb_store_json_formatter_t *f = F(user_data);
+
+ if ((! attr) || (! user_data))
+ return -1;
+
+ {
+ obj_t o = {
+ SDB_ATTRIBUTE,
+ attr->key,
+
+ /* value */ &attr->value,
+ /* timeseries */ -1,
+
+ attr->last_update,
+ attr->interval,
+ attr->backends_num,
+ (const char * const *)attr->backends,
+ };
+
+ return json_emit(f, &o);
+ }
+} /* emit_attribute */
+
/*
* public API
*/
+sdb_store_writer_t sdb_store_json_writer = {
+ emit_host, emit_service, emit_metric, emit_attribute,
+};
+
sdb_store_json_formatter_t *
sdb_store_json_formatter(sdb_strbuf_t *buf, int type, int flags)
{
{
if ((! f) || (! obj))
return -1;
- return json_emit(f, obj);
+
+ switch (obj->type) {
+ case SDB_HOST:
+ {
+ sdb_store_host_t host = {
+ obj->_name,
+ obj->last_update,
+ obj->interval,
+ (const char * const *)obj->backends,
+ obj->backends_num,
+ };
+ return sdb_store_json_writer.store_host(&host, SDB_OBJ(f));
+ }
+ case SDB_SERVICE:
+ {
+ sdb_store_service_t service = {
+ obj->parent ? obj->parent->_name : NULL,
+ obj->_name,
+ obj->last_update,
+ obj->interval,
+ (const char * const *)obj->backends,
+ obj->backends_num,
+ };
+ return sdb_store_json_writer.store_service(&service, SDB_OBJ(f));
+ }
+ case SDB_METRIC:
+ {
+ sdb_store_metric_t metric = {
+ obj->parent ? obj->parent->_name : NULL,
+ obj->_name,
+ {
+ METRIC(obj)->store.type,
+ METRIC(obj)->store.id,
+ },
+ obj->last_update,
+ obj->interval,
+ (const char * const *)obj->backends,
+ obj->backends_num,
+ };
+ return sdb_store_json_writer.store_metric(&metric, SDB_OBJ(f));
+ }
+ case SDB_ATTRIBUTE:
+ {
+ sdb_store_attribute_t attr = {
+ NULL,
+ obj->parent ? obj->parent->type : 0,
+ obj->parent ? obj->parent->_name : NULL,
+ obj->_name,
+ ATTR(obj)->value,
+ obj->last_update,
+ obj->interval,
+ (const char * const *)obj->backends,
+ obj->backends_num,
+ };
+ if (obj->parent && (obj->parent->type != SDB_HOST)
+ && obj->parent->parent)
+ attr.hostname = obj->parent->parent->_name;
+ return sdb_store_json_writer.store_attribute(&attr, SDB_OBJ(f));
+ }
+ }
+
+ return -1;
} /* sdb_store_json_emit */
int