X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Ffrontend%2Fquery.c;h=97698fd300be6af87607c13d9b7c2336cea54b48;hp=b3bf05e3bc83939d85b5de86faf099df49d392d1;hb=4404b790e34bebc820c02d5749c84c0c975ba417;hpb=ddb933096618a6bceded29e4dc2b37cb72134366

diff --git a/src/frontend/query.c b/src/frontend/query.c
index b3bf05e..97698fd 100644
--- a/src/frontend/query.c
+++ b/src/frontend/query.c
@@ -1,6 +1,6 @@
 /*
  * SysDB - src/frontend/query.c
- * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
+ * Copyright (C) 2013-2014 Sebastian 'tokkee' Harl <sh@tokkee.org>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -25,49 +25,352 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifdef HAVE_CONFIG_H
+#	include "config.h"
+#endif
+
 #include "sysdb.h"
 
 #include "core/store.h"
 #include "frontend/connection-private.h"
+#include "parser/ast.h"
+#include "parser/parser.h"
 #include "utils/error.h"
+#include "utils/proto.h"
 #include "utils/strbuf.h"
 
 #include <errno.h>
+#include <string.h>
 
 /*
- * public API
+ * private helper functions
  */
 
-int
-sdb_fe_list(sdb_conn_t *conn)
+static char *
+sstrdup(const char *s)
+{
+	return s ? strdup(s) : NULL;
+} /* sstrdup */
+
+static int
+query_exec(sdb_conn_t *conn, sdb_ast_node_t *ast)
 {
+	sdb_store_query_t *q;
 	sdb_strbuf_t *buf;
+	int status;
 
-	buf = sdb_strbuf_create(1024);
-	if (! buf) {
-		char errbuf[1024];
-		sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
-				"buffer to handle LIST command: %s",
-				sdb_strerror(errno, errbuf, sizeof(errbuf)));
+	if (! ast) {
+		sdb_strbuf_sprintf(conn->errbuf, "out of memory");
+		return -1;
+	}
 
-		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
-		sdb_strbuf_destroy(buf);
+	q = sdb_store_query_prepare(ast);
+	if (! q) {
+		/* this shouldn't happen */
+		sdb_strbuf_sprintf(conn->errbuf, "failed to compile AST");
+		sdb_log(SDB_LOG_ERR, "frontend: failed to compile AST");
 		return -1;
 	}
 
-	if (sdb_store_tojson(buf)) {
-		sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
-				"store to JSON");
+	buf = sdb_strbuf_create(1024);
+	if (! buf) {
 		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
-		sdb_strbuf_destroy(buf);
+		sdb_object_deref(SDB_OBJ(q));
 		return -1;
 	}
+	status = sdb_store_query_execute(q, buf, conn->errbuf);
+	if (status < 0) {
+		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 execute query '%s'", query);
+	}
+	else
+		sdb_connection_send(conn, status,
+				(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 
-	sdb_connection_send(conn, CONNECTION_OK,
-			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 	sdb_strbuf_destroy(buf);
-	return 0;
-} /* session_start */
+	sdb_object_deref(SDB_OBJ(q));
+	return status < 0 ? status : 0;
+} /* query_exec */
+
+/*
+ * public API
+ */
+
+int
+sdb_fe_query(sdb_conn_t *conn)
+{
+	sdb_llist_t *parsetree;
+	sdb_ast_node_t *ast = NULL;
+	int status = 0;
+
+	if ((! conn) || (conn->cmd != SDB_CONNECTION_QUERY))
+		return -1;
+
+	parsetree = sdb_parser_parse(sdb_strbuf_string(conn->buf),
+			(int)conn->cmd_len, conn->errbuf);
+	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': %s",
+				query, sdb_strbuf_string(conn->errbuf));
+		return -1;
+	}
+
+	switch (sdb_llist_len(parsetree)) {
+		case 0:
+			/* skipping empty command; send back an empty reply */
+			sdb_connection_send(conn, SDB_CONNECTION_DATA, 0, NULL);
+			break;
+		case 1:
+			ast = SDB_AST_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);
+				ast = SDB_AST_NODE(sdb_llist_get(parsetree, 0));
+			}
+	}
+
+	if (ast) {
+		status = query_exec(conn, ast);
+		sdb_object_deref(SDB_OBJ(ast));
+	}
+	sdb_llist_destroy(parsetree);
+	return status;
+} /* sdb_fe_query */
+
+int
+sdb_fe_fetch(sdb_conn_t *conn)
+{
+	sdb_ast_node_t *ast;
+	char hostname[conn->cmd_len + 1];
+	char name[conn->cmd_len + 1];
+	uint32_t type;
+	int status;
+
+	if ((! conn) || (conn->cmd != SDB_CONNECTION_FETCH))
+		return -1;
+
+	if (conn->cmd_len < sizeof(uint32_t)) {
+		sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
+				"FETCH command", conn->cmd_len);
+		sdb_strbuf_sprintf(conn->errbuf, "FETCH: Invalid command length %d",
+				conn->cmd_len);
+		return -1;
+	}
+
+	/* TODO: support other types besides hosts */
+	hostname[0] = '\0';
+
+	sdb_proto_unmarshal_int32(SDB_STRBUF_STR(conn->buf), &type);
+	strncpy(name, sdb_strbuf_string(conn->buf) + sizeof(uint32_t),
+			conn->cmd_len - sizeof(uint32_t));
+	name[sizeof(name) - 1] = '\0';
+
+	ast = sdb_ast_fetch_create((int)type,
+			hostname[0] ? strdup(hostname) : NULL,
+			name[0] ? strdup(name) : NULL,
+			/* filter = */ NULL);
+	status = query_exec(conn, ast);
+	sdb_object_deref(SDB_OBJ(ast));
+	return status;
+} /* sdb_fe_fetch */
+
+int
+sdb_fe_list(sdb_conn_t *conn)
+{
+	sdb_ast_node_t *ast;
+	uint32_t type = SDB_HOST;
+	int status;
+
+	if ((! conn) || (conn->cmd != SDB_CONNECTION_LIST))
+		return -1;
+
+	if (conn->cmd_len == sizeof(uint32_t))
+		sdb_proto_unmarshal_int32(SDB_STRBUF_STR(conn->buf), &type);
+	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;
+	}
+
+	ast = sdb_ast_list_create((int)type, /* filter = */ NULL);
+	status = query_exec(conn, ast);
+	sdb_object_deref(SDB_OBJ(ast));
+	return status;
+} /* sdb_fe_list */
+
+int
+sdb_fe_lookup(sdb_conn_t *conn)
+{
+	sdb_ast_node_t *ast, *m;
+	const char *matcher;
+	size_t matcher_len;
+
+	uint32_t type;
+	int status;
+
+	if ((! conn) || (conn->cmd != SDB_CONNECTION_LOOKUP))
+		return -1;
+
+	if (conn->cmd_len < sizeof(uint32_t)) {
+		sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
+				"LOOKUP command", conn->cmd_len);
+		sdb_strbuf_sprintf(conn->errbuf, "LOOKUP: Invalid command length %d",
+				conn->cmd_len);
+		return -1;
+	}
+	sdb_proto_unmarshal_int32(SDB_STRBUF_STR(conn->buf), &type);
+
+	matcher = sdb_strbuf_string(conn->buf) + sizeof(uint32_t);
+	matcher_len = conn->cmd_len - sizeof(uint32_t);
+	m = sdb_parser_parse_conditional(matcher, (int)matcher_len, conn->errbuf);
+	if (! m) {
+		char expr[matcher_len + 1];
+		strncpy(expr, matcher, sizeof(expr));
+		expr[sizeof(expr) - 1] = '\0';
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to parse lookup condition '%s': %s",
+				expr, sdb_strbuf_string(conn->errbuf));
+		return -1;
+	}
+
+	ast = sdb_ast_lookup_create((int)type, m, /* filter = */ NULL);
+	/* run analyzer using the full context */
+	if (ast && sdb_parser_analyze(ast, conn->errbuf)) {
+		char expr[matcher_len + 1];
+		char err[sdb_strbuf_len(conn->errbuf) + sizeof(expr) + 64];
+		strncpy(expr, matcher, sizeof(expr));
+		expr[sizeof(expr) - 1] = '\0';
+		snprintf(err, sizeof(err), "Failed to parse lookup condition '%s': %s",
+				expr, sdb_strbuf_string(conn->errbuf));
+		sdb_strbuf_sprintf(conn->errbuf, "%s", err);
+		status = -1;
+	}
+	else
+		status = query_exec(conn, ast);
+	if (! ast)
+		sdb_object_deref(SDB_OBJ(m));
+	sdb_object_deref(SDB_OBJ(ast));
+	return status;
+} /* sdb_fe_lookup */
+
+int
+sdb_fe_store(sdb_conn_t *conn)
+{
+	sdb_ast_node_t *ast;
+	const char *buf = sdb_strbuf_string(conn->buf);
+	size_t len = conn->cmd_len;
+	uint32_t type;
+	ssize_t n;
+	int status;
+
+	if ((! conn) || (conn->cmd != SDB_CONNECTION_STORE))
+		return -1;
+
+	if ((n = sdb_proto_unmarshal_int32(buf, len, &type)) < 0) {
+		sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %zu for "
+				"STORE command", len);
+		sdb_strbuf_sprintf(conn->errbuf,
+				"STORE: Invalid command length %zu", len);
+		return -1;
+	}
+
+	switch (type) {
+		case SDB_HOST:
+		{
+			sdb_proto_host_t host;
+			if (sdb_proto_unmarshal_host(buf, len, &host) < 0) {
+				sdb_strbuf_sprintf(conn->errbuf,
+						"STORE: Failed to unmarshal host object");
+				return -1;
+			}
+			ast = sdb_ast_store_create(SDB_HOST, /* host */ NULL,
+					/* parent */ 0, NULL, sstrdup(host.name), host.last_update,
+					/* metric store */ NULL, NULL, SDB_DATA_NULL);
+		}
+		break;
+
+		case SDB_SERVICE:
+		{
+			sdb_proto_service_t svc;
+			if (sdb_proto_unmarshal_service(buf, len, &svc) < 0) {
+				sdb_strbuf_sprintf(conn->errbuf,
+						"STORE: Failed to unmarshal service object");
+				return -1;
+			}
+			ast = sdb_ast_store_create(SDB_SERVICE, sstrdup(svc.hostname),
+					/* parent */ 0, NULL, sstrdup(svc.name), svc.last_update,
+					/* metric store */ NULL, NULL, SDB_DATA_NULL);
+		}
+		break;
+
+		case SDB_METRIC:
+		{
+			sdb_proto_metric_t metric;
+			if (sdb_proto_unmarshal_metric(buf, len, &metric) < 0) {
+				sdb_strbuf_sprintf(conn->errbuf,
+						"STORE: Failed to unmarshal metric object");
+				return -1;
+			}
+			ast = sdb_ast_store_create(SDB_METRIC, sstrdup(metric.hostname),
+					/* parent */ 0, NULL, sstrdup(metric.name), metric.last_update,
+					sstrdup(metric.store_type), sstrdup(metric.store_id),
+					SDB_DATA_NULL);
+		}
+		break;
+	}
+
+	if (type & SDB_ATTRIBUTE) {
+		sdb_proto_attribute_t attr;
+		const char *hostname, *parent;
+		int parent_type;
+		if (sdb_proto_unmarshal_attribute(buf, len, &attr) < 0) {
+			sdb_strbuf_sprintf(conn->errbuf,
+					"STORE: Failed to unmarshal attribute object");
+			return -1;
+		}
+		if (attr.parent_type == SDB_HOST) {
+			hostname = attr.parent;
+			parent_type = 0;
+			parent = NULL;
+		}
+		else {
+			hostname = attr.hostname;
+			parent_type = attr.parent_type;
+			parent = attr.parent;
+		}
+		ast = sdb_ast_store_create(SDB_ATTRIBUTE, sstrdup(hostname),
+				parent_type, sstrdup(parent), sstrdup(attr.key),
+				attr.last_update, /* metric store */ NULL, NULL,
+				attr.value);
+	}
+
+	if (! ast) {
+		sdb_log(SDB_LOG_ERR, "frontend: Invalid object type %d for "
+				"STORE COMMAND", type);
+		sdb_strbuf_sprintf(conn->errbuf, "STORE: Invalid object type %d", type);
+		return -1;
+	}
+
+	status = sdb_parser_analyze(ast, conn->errbuf);
+	if (! status)
+		status = query_exec(conn, ast);
+	sdb_object_deref(SDB_OBJ(ast));
+	return status;
+} /* sdb_fe_store */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */