X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Ffrontend%2Fquery.c;h=d04aca980273374423eaf80ca98cd2ff12e234c2;hp=ffec03aef40bc406a2619cc1972f9630dc5a8505;hb=816e3e1e9fea25d37504e3f0f51b758a41e60ae3;hpb=5fca8c1720eaadfacd58ec094a6af12d6b22558d

diff --git a/src/frontend/query.c b/src/frontend/query.c
index ffec03a..d04aca9 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
@@ -25,66 +25,241 @@
  * 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>
+
+/*
+ * private helper functions
+ */
+
+static int
+query_exec(sdb_conn_t *conn, sdb_ast_node_t *ast)
+{
+	sdb_store_query_t *q;
+	sdb_strbuf_t *buf;
+	int status;
+
+	if (! ast) {
+		sdb_strbuf_sprintf(conn->errbuf, "out of memory");
+		return -1;
+	}
+
+	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;
+	}
+
+	buf = sdb_strbuf_create(1024);
+	if (! buf) {
+		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
+		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_strbuf_destroy(buf);
+	sdb_object_deref(SDB_OBJ(q));
+	return status < 0 ? status : 0;
+} /* query_exec */
 
 /*
  * public API
  */
 
 int
-sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
+sdb_fe_query(sdb_conn_t *conn)
 {
-	if (! node)
+	sdb_llist_t *parsetree;
+	sdb_ast_node_t *ast = NULL;
+	int status = 0;
+
+	if ((! conn) || (conn->cmd != SDB_CONNECTION_QUERY))
 		return -1;
 
-	switch (node->cmd) {
-		case CONNECTION_LIST:
-			return sdb_fe_list(conn);
+	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:
-			sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
-			return -1;
+			{
+				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));
+			}
 	}
-	return -1;
-} /* sdb_fe_exec */
+
+	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_list(sdb_conn_t *conn)
+sdb_fe_fetch(sdb_conn_t *conn)
 {
-	sdb_strbuf_t *buf;
+	sdb_ast_node_t *ast;
+	char hostname[conn->cmd_len + 1];
+	char name[conn->cmd_len + 1];
+	uint32_t type;
+	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 ((! conn) || (conn->cmd != SDB_CONNECTION_FETCH))
+		return -1;
 
-		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
-		sdb_strbuf_destroy(buf);
+	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;
 	}
 
-	if (sdb_store_tojson(buf, /* flags = */ 0)) {
-		sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
-				"store to JSON");
-		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
-		sdb_strbuf_destroy(buf);
+	/* 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;
 	}
 
-	sdb_connection_send(conn, CONNECTION_OK,
-			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
-	sdb_strbuf_destroy(buf);
-	return 0;
+	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 */
+
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */