X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Ffrontend%2Fquery.c;h=1751ba57e7a9a241b148cbc4f4dc391787cf0c44;hp=fa493a6dd04be5a8139c0cae0485d2bea43703c6;hb=ef3e099a424694e6247252a40c7b3be343f3cebd;hpb=5610952da2f4190573bc10467fcf249a9e7eff4b

diff --git a/src/frontend/query.c b/src/frontend/query.c
index fa493a6..1751ba5 100644
--- a/src/frontend/query.c
+++ b/src/frontend/query.c
@@ -27,21 +27,262 @@
 
 #include "sysdb.h"
 
-#include "core/error.h"
 #include "core/store.h"
 #include "frontend/connection-private.h"
+#include "frontend/parser.h"
+#include "utils/error.h"
+#include "utils/proto.h"
 #include "utils/strbuf.h"
 
 #include <errno.h>
+#include <string.h>
+
+/*
+ * private helper functions
+ */
+
+typedef struct {
+	sdb_strbuf_t *buf;
+	sdb_store_matcher_t *filter;
+
+	size_t last_len;
+} tojson_data_t;
+
+static int
+lookup_tojson(sdb_store_obj_t *obj, void *user_data)
+{
+	tojson_data_t *data = user_data;
+	int status;
+
+	if (data->filter && (! sdb_store_matcher_matches(data->filter, obj, NULL)))
+		return 0;
+
+	if (sdb_strbuf_len(data->buf) > data->last_len)
+		sdb_strbuf_append(data->buf, ",");
+	data->last_len = sdb_strbuf_len(data->buf);
+	status = sdb_store_host_tojson(obj, data->buf,
+			data->filter, /* flags = */ 0);
+	return status;
+} /* lookup_tojson */
 
 /*
  * public API
  */
 
+int
+sdb_fe_query(sdb_conn_t *conn)
+{
+	sdb_llist_t *parsetree;
+	sdb_conn_node_t *node = NULL;
+	int status = 0;
+
+	if ((! conn) || (conn->cmd != CONNECTION_QUERY))
+		return -1;
+
+	parsetree = sdb_fe_parse(sdb_strbuf_string(conn->buf),
+			(int)conn->cmd_len);
+	if (! parsetree) {
+		char query[conn->cmd_len + 1];
+		strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
+		query[sizeof(query) - 1] = '\0';
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to parse query '%s'",
+				query);
+		return -1;
+	}
+
+	switch (sdb_llist_len(parsetree)) {
+		case 0:
+			/* skipping empty command; send back an empty reply */
+			sdb_connection_send(conn, CONNECTION_DATA, 0, NULL);
+			break;
+		case 1:
+			node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
+			break;
+
+		default:
+			{
+				char query[conn->cmd_len + 1];
+				strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
+				query[sizeof(query) - 1] = '\0';
+				sdb_log(SDB_LOG_WARNING, "frontend: Ignoring %zu command%s "
+						"in multi-statement query '%s'",
+						sdb_llist_len(parsetree) - 1,
+						sdb_llist_len(parsetree) == 2 ? "" : "s",
+						query);
+				node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
+			}
+	}
+
+	if (node) {
+		status = sdb_fe_exec(conn, node);
+		sdb_object_deref(SDB_OBJ(node));
+	}
+
+	sdb_llist_destroy(parsetree);
+	return status;
+} /* sdb_fe_query */
+
+int
+sdb_fe_fetch(sdb_conn_t *conn)
+{
+	char hostname[conn->cmd_len + 1];
+	if ((! conn) || (conn->cmd != CONNECTION_FETCH))
+		return -1;
+	strncpy(hostname, sdb_strbuf_string(conn->buf), conn->cmd_len);
+	hostname[sizeof(hostname) - 1] = '\0';
+	return sdb_fe_exec_fetch(conn, hostname, /* filter = */ NULL);
+} /* sdb_fe_fetch */
+
 int
 sdb_fe_list(sdb_conn_t *conn)
+{
+	int type = SDB_HOST;
+
+	if ((! conn) || (conn->cmd != CONNECTION_LIST))
+		return -1;
+
+	if (conn->cmd_len == sizeof(uint32_t))
+		type = sdb_proto_get_int(conn->buf, 0);
+	else if (conn->cmd_len) {
+		sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
+				"LIST command", conn->cmd_len);
+		sdb_strbuf_sprintf(conn->errbuf, "LIST: Invalid command length %d",
+				conn->cmd_len);
+		return -1;
+	}
+	return sdb_fe_exec_list(conn, type, /* filter = */ NULL);
+} /* sdb_fe_list */
+
+int
+sdb_fe_lookup(sdb_conn_t *conn)
+{
+	sdb_store_matcher_t *m;
+	int status;
+
+	if ((! conn) || (conn->cmd != CONNECTION_LOOKUP))
+		return -1;
+
+	m = sdb_fe_parse_matcher(sdb_strbuf_string(conn->buf),
+			(int)conn->cmd_len);
+	if (! m) {
+		char expr[conn->cmd_len + 1];
+		strncpy(expr, sdb_strbuf_string(conn->buf), conn->cmd_len);
+		expr[sizeof(expr) - 1] = '\0';
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to parse "
+				"lookup condition '%s'", expr);
+		return -1;
+	}
+
+	status = sdb_fe_exec_lookup(conn, m, /* filter = */ NULL);
+	sdb_object_deref(SDB_OBJ(m));
+	return status;
+} /* sdb_fe_lookup */
+
+int
+sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
+{
+	sdb_store_matcher_t *m = NULL, *filter = NULL;
+
+	if (! node)
+		return -1;
+
+	switch (node->cmd) {
+		case CONNECTION_FETCH:
+			if (CONN_FETCH(node)->filter)
+				filter = CONN_FETCH(node)->filter->matcher;
+			return sdb_fe_exec_fetch(conn, CONN_FETCH(node)->name, filter);
+		case CONNECTION_LIST:
+			if (CONN_LIST(node)->filter)
+				filter = CONN_LIST(node)->filter->matcher;
+			return sdb_fe_exec_list(conn, CONN_LIST(node)->type, filter);
+		case CONNECTION_LOOKUP:
+			if (CONN_LOOKUP(node)->matcher)
+				m = CONN_LOOKUP(node)->matcher->matcher;
+			if (CONN_LOOKUP(node)->filter)
+				filter = CONN_LOOKUP(node)->filter->matcher;
+			return sdb_fe_exec_lookup(conn, m, filter);
+		case CONNECTION_TIMESERIES:
+			return sdb_fe_exec_timeseries(conn,
+					CONN_TS(node)->hostname, CONN_TS(node)->metric,
+					&CONN_TS(node)->opts);
+
+		default:
+			sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
+			return -1;
+	}
+	return -1;
+} /* sdb_fe_exec */
+
+int
+sdb_fe_exec_fetch(sdb_conn_t *conn, const char *name,
+		sdb_store_matcher_t *filter)
+{
+	sdb_strbuf_t *buf;
+	sdb_store_obj_t *host;
+	uint32_t res_type = htonl(CONNECTION_FETCH);
+
+	host = sdb_store_get_host(name);
+	if (! host) {
+		sdb_log(SDB_LOG_DEBUG, "frontend: Failed to fetch host '%s': "
+				"not found", name);
+
+		sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
+		return -1;
+	}
+
+	buf = sdb_strbuf_create(1024);
+	if (! buf) {
+		char errbuf[1024];
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+				"buffer to handle FETCH command: %s",
+				sdb_strerror(errno, errbuf, sizeof(errbuf)));
+
+		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
+		sdb_strbuf_destroy(buf);
+		sdb_object_deref(SDB_OBJ(host));
+		return -1;
+	}
+
+	sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
+	if (sdb_store_host_tojson(host, buf, filter, /* flags = */ 0)) {
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
+				"host '%s' to JSON", name);
+		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
+		sdb_strbuf_destroy(buf);
+		sdb_object_deref(SDB_OBJ(host));
+		return -1;
+	}
+
+	sdb_connection_send(conn, CONNECTION_DATA,
+			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
+	sdb_strbuf_destroy(buf);
+	sdb_object_deref(SDB_OBJ(host));
+	return 0;
+} /* sdb_fe_exec_fetch */
+
+int
+sdb_fe_exec_list(sdb_conn_t *conn, int type, sdb_store_matcher_t *filter)
 {
 	sdb_strbuf_t *buf;
+	uint32_t res_type = htonl(CONNECTION_LIST);
+
+	int flags;
+
+	if (type == SDB_HOST)
+		flags = SDB_SKIP_ALL;
+	else if (type == SDB_SERVICE)
+		flags = (SDB_SKIP_ALL & (~SDB_SKIP_SERVICES))
+			| SDB_SKIP_EMPTY_SERVICES;
+	else if (type == SDB_METRIC)
+		flags = (SDB_SKIP_ALL & (~SDB_SKIP_METRICS))
+			| SDB_SKIP_EMPTY_METRICS;
+	else {
+		sdb_log(SDB_LOG_ERR, "frontend: Invalid object type %d "
+				"for LIST command", type);
+		sdb_strbuf_sprintf(conn->errbuf,
+				"LIST: Invalid object type %d", type);
+		return -1;
+	}
 
 	buf = sdb_strbuf_create(1024);
 	if (! buf) {
@@ -55,7 +296,8 @@ sdb_fe_list(sdb_conn_t *conn)
 		return -1;
 	}
 
-	if (sdb_store_tojson(buf)) {
+	sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
+	if (sdb_store_tojson(buf, filter, flags)) {
 		sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 				"store to JSON");
 		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
@@ -63,11 +305,85 @@ sdb_fe_list(sdb_conn_t *conn)
 		return -1;
 	}
 
-	sdb_connection_send(conn, CONNECTION_OK,
+	sdb_connection_send(conn, CONNECTION_DATA,
+			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
+	sdb_strbuf_destroy(buf);
+	return 0;
+} /* sdb_fe_exec_list */
+
+int
+sdb_fe_exec_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m,
+		sdb_store_matcher_t *filter)
+{
+	tojson_data_t data = { NULL, filter, 0 };
+	uint32_t res_type = htonl(CONNECTION_LOOKUP);
+
+	data.buf = sdb_strbuf_create(1024);
+	if (! data.buf) {
+		char errbuf[1024];
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+				"buffer to handle LOOKUP command: %s",
+				sdb_strerror(errno, errbuf, sizeof(errbuf)));
+
+		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
+		sdb_strbuf_destroy(data.buf);
+		return -1;
+	}
+
+	sdb_strbuf_memcpy(data.buf, &res_type, sizeof(uint32_t));
+	sdb_strbuf_append(data.buf, "[");
+
+	/* Let the JSON serializer handle the filter instead of the scanner. Else,
+	 * we'd have to filter twice -- once in the scanner and then again in the
+	 * serializer. */
+	data.last_len = sdb_strbuf_len(data.buf);
+	if (sdb_store_scan(m, /* filter */ NULL, lookup_tojson, &data)) {
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
+		sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
+		sdb_strbuf_destroy(data.buf);
+		return -1;
+	}
+
+	sdb_strbuf_append(data.buf, "]");
+
+	sdb_connection_send(conn, CONNECTION_DATA,
+			(uint32_t)sdb_strbuf_len(data.buf), sdb_strbuf_string(data.buf));
+	sdb_strbuf_destroy(data.buf);
+	return 0;
+} /* sdb_fe_exec_lookup */
+
+int
+sdb_fe_exec_timeseries(sdb_conn_t *conn,
+		const char *hostname, const char *metric,
+		sdb_timeseries_opts_t *opts)
+{
+	sdb_strbuf_t *buf;
+	uint32_t res_type = htonl(CONNECTION_TIMESERIES);
+
+	buf = sdb_strbuf_create(1024);
+	if (! buf) {
+		char errbuf[1024];
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+				"buffer to handle TIMESERIES command: %s",
+				sdb_strerror(errno, errbuf, sizeof(errbuf)));
+
+		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
+		return -1;
+	}
+
+	sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
+	if (sdb_store_fetch_timeseries(hostname, metric, opts, buf)) {
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to fetch time-series");
+		sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch time-series");
+		sdb_strbuf_destroy(buf);
+		return -1;
+	}
+
+	sdb_connection_send(conn, CONNECTION_DATA,
 			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 	sdb_strbuf_destroy(buf);
 	return 0;
-} /* session_start */
+} /* sdb_fe_exec_timeseries */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */