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diff --git a/src/core/plugin.c b/src/core/plugin.c
index 3ba98df263cb7a3e257fbcac2a7dd364005ca979..da8a485b960a4786b914102e9f9fbc741378170a 100644 (file)
--- a/src/core/plugin.c
+++ b/src/core/plugin.c
} writer_t;
#define WRITER(obj) ((writer_t *)(obj))
+typedef struct {
+ callback_t super; /* cb_callback will always be NULL */
+#define r_user_data super.cb_user_data
+#define r_ctx super.cb_ctx
+ sdb_store_reader_t impl;
+} reader_t;
+#define READER(obj) ((reader_t *)(obj))
+
/*
* private variables
*/
static sdb_llist_t *log_list = NULL;
static sdb_llist_t *ts_fetcher_list = NULL;
static sdb_llist_t *writer_list = NULL;
+static sdb_llist_t *reader_list = NULL;
static struct {
const char *type;
{ "log", &log_list },
{ "timeseries fetcher", &ts_fetcher_list },
{ "store writer", &writer_list },
+ { "store reader", &reader_list },
};
/*
plugin_writer_destroy
};
+static int
+plugin_reader_init(sdb_object_t *obj, va_list ap)
+{
+ sdb_store_reader_t *impl = va_arg(ap, sdb_store_reader_t *);
+ sdb_object_t *ud = va_arg(ap, sdb_object_t *);
+
+ assert(impl);
+
+ if ((! impl->prepare_query) || (! impl->execute_query)) {
+ sdb_log(SDB_LOG_ERR, "core: store reader callback '%s' "
+ "does not fully implement the reader interface.",
+ obj->name);
+ return -1;
+ }
+ if (sdb_llist_search_by_name(reader_list, obj->name)) {
+ sdb_log(SDB_LOG_WARNING, "core: store reader callback '%s' "
+ "has already been registered. Ignoring newly "
+ "registered version.", obj->name);
+ return -1;
+ }
+
+ /* ctx may be NULL if the callback was not registered by a plugin */
+
+ READER(obj)->impl = *impl;
+ READER(obj)->r_ctx = ctx_get();
+ sdb_object_ref(SDB_OBJ(READER(obj)->r_ctx));
+
+ sdb_object_ref(ud);
+ READER(obj)->r_user_data = ud;
+ return 0;
+} /* plugin_reader_init */
+
+static void
+plugin_reader_destroy(sdb_object_t *obj)
+{
+ assert(obj);
+ sdb_object_deref(READER(obj)->r_user_data);
+ sdb_object_deref(SDB_OBJ(READER(obj)->r_ctx));
+} /* plugin_reader_destroy */
+
+static sdb_type_t reader_type = {
+ sizeof(reader_t),
+
+ plugin_reader_init,
+ plugin_reader_destroy
+};
+
static int
module_init(const char *name, lt_dlhandle lh, sdb_plugin_info_t *info)
{
return 0;
} /* sdb_store_register_writer */
+int
+sdb_plugin_register_reader(const char *name,
+ sdb_store_reader_t *reader, sdb_object_t *user_data)
+{
+ char cb_name[1024];
+ sdb_object_t *obj;
+
+ if ((! name) || (! reader))
+ return -1;
+
+ if (! reader_list)
+ reader_list = sdb_llist_create();
+ if (! reader_list)
+ return -1;
+
+ plugin_get_name(name, cb_name, sizeof(cb_name));
+
+ obj = sdb_object_create(cb_name, reader_type,
+ reader, user_data);
+ if (! obj)
+ return -1;
+
+ if (sdb_llist_append(reader_list, obj)) {
+ sdb_object_deref(obj);
+ return -1;
+ }
+
+ /* pass control to the list */
+ sdb_object_deref(obj);
+
+ sdb_log(SDB_LOG_INFO, "core: Registered store reader callback '%s'.",
+ cb_name);
+ return 0;
+} /* sdb_plugin_register_reader */
+
void
sdb_plugin_unregister_all(void)
{
return ts;
} /* sdb_plugin_fetch_timeseries */
+int
+sdb_plugin_query(sdb_ast_node_t *ast, sdb_strbuf_t *buf, sdb_strbuf_t *errbuf)
+{
+ size_t n = sdb_llist_len(reader_list);
+ reader_t *reader;
+ sdb_object_t *q;
+ int status = 0;
+
+ if (! ast)
+ return 0;
+
+ if (n != 1) {
+ char *msg = (n > 0)
+ ? "Cannot execute query: multiple readers not supported"
+ : "Cannot execute query: no readers registered";
+ sdb_strbuf_sprintf(errbuf, "%s", msg);
+ sdb_log(SDB_LOG_ERR, "core: %s", msg);
+ return -1;
+ }
+
+ reader = READER(sdb_llist_get(reader_list, 0));
+ assert(reader);
+
+ q = reader->impl.prepare_query(ast, errbuf, reader->r_user_data);
+ if (q)
+ status = reader->impl.execute_query(q, buf, errbuf, reader->r_user_data);
+ else
+ status = -1;
+
+ sdb_object_deref(SDB_OBJ(q));
+ sdb_object_deref(SDB_OBJ(reader));
+ return status;
+} /* sdb_plugin_query */
+
int
sdb_plugin_store_host(const char *name, sdb_time_t last_update)
{
if (! name)
return -1;
+ if (! sdb_llist_len(writer_list)) {
+ sdb_log(SDB_LOG_ERR, "core: Cannot store host: "
+ "no writers registered");
+ return -1;
+ }
+
iter = sdb_llist_get_iter(writer_list);
while (sdb_llist_iter_has_next(iter)) {
writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
if ((! hostname) || (! name))
return -1;
+ if (! sdb_llist_len(writer_list)) {
+ sdb_log(SDB_LOG_ERR, "core: Cannot store service: "
+ "no writers registered");
+ return -1;
+ }
+
iter = sdb_llist_get_iter(writer_list);
while (sdb_llist_iter_has_next(iter)) {
writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
if ((! hostname) || (! name))
return -1;
+ if (! sdb_llist_len(writer_list)) {
+ sdb_log(SDB_LOG_ERR, "core: Cannot store metric: "
+ "no writers registered");
+ return -1;
+ }
+
if (store && ((! store->type) || (! store->id)))
store = NULL;
if ((! hostname) || (! key) || (! value))
return -1;
+ if (! sdb_llist_len(writer_list)) {
+ sdb_log(SDB_LOG_ERR, "core: Cannot store attribute: "
+ "no writers registered");
+ return -1;
+ }
+
iter = sdb_llist_get_iter(writer_list);
while (sdb_llist_iter_has_next(iter)) {
writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
@@ -1437,6 +1587,12 @@ sdb_plugin_store_service_attribute(const char *hostname, const char *service,
if ((! hostname) || (! service) || (! key) || (! value))
return -1;
+ if (! sdb_llist_len(writer_list)) {
+ sdb_log(SDB_LOG_ERR, "core: Cannot store service attribute: "
+ "no writers registered");
+ return -1;
+ }
+
iter = sdb_llist_get_iter(writer_list);
while (sdb_llist_iter_has_next(iter)) {
writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
if ((! hostname) || (! metric) || (! key) || (! value))
return -1;
+ if (! sdb_llist_len(writer_list)) {
+ sdb_log(SDB_LOG_ERR, "core: Cannot store metric attribute: "
+ "no writers registered");
+ return -1;
+ }
+
iter = sdb_llist_get_iter(writer_list);
while (sdb_llist_iter_has_next(iter)) {
writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));