X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Ffrontend%2Fquery.c;h=149750b05782dc80311278f495fc994ad1b9cf1f;hp=d7476d345d48791f7cac512daca7ebfcfae49782;hb=740f1a8839faaf3033ea23f4cf2eea0dc0209d13;hpb=a253fa4a57c8ac8abd2e0801d55f8556b87ef836

diff --git a/src/frontend/query.c b/src/frontend/query.c
index d7476d3..149750b 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
@@ -29,22 +29,34 @@
 
 #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
-lookup_tojson(sdb_store_obj_t *obj, void *user_data)
+list_tojson(sdb_store_obj_t *obj,
+		sdb_store_matcher_t __attribute__((unused)) *filter,
+		void *user_data)
 {
-	sdb_strbuf_t *buf = user_data;
-	if (sdb_strbuf_len(buf) > 1)
-		sdb_strbuf_append(buf, ",");
-	return sdb_store_host_tojson(obj, buf, /* flags = */ 0);
+	sdb_store_json_formatter_t *f = user_data;
+	return sdb_store_json_emit(f, obj);
+} /* list_tojson */
+
+static int
+lookup_tojson(sdb_store_obj_t *obj, sdb_store_matcher_t *filter,
+		void *user_data)
+{
+	sdb_store_json_formatter_t *f = user_data;
+	return sdb_store_json_emit_full(f, obj, filter);
 } /* lookup_tojson */
 
 /*
@@ -52,40 +64,255 @@ lookup_tojson(sdb_store_obj_t *obj, void *user_data)
  */
 
 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;
+
+	sdb_store_matcher_t *q;
+	sdb_strbuf_t *buf = 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 (node->cmd) {
-		case CONNECTION_FETCH:
-			return sdb_fe_fetch(conn, CONN_FETCH(node)->name);
-		case CONNECTION_LIST:
-			return sdb_fe_list(conn);
-		case CONNECTION_LOOKUP:
-			return sdb_fe_lookup(conn, CONN_LOOKUP(node)->matcher->matcher);
+	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);
+			{
+				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));
+			}
+	}
+
+	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");
+		status = -1;
+	} else {
+		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);
+		}
+	}
+	sdb_object_deref(SDB_OBJ(ast));
+	sdb_llist_destroy(parsetree);
+
+	if (status < 0) {
+		sdb_object_deref(SDB_OBJ(q));
+		sdb_strbuf_destroy(buf);
+		return status;
 	}
-	return -1;
-} /* sdb_fe_exec */
+
+	assert(buf);
+	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 0;
+} /* sdb_fe_query */
 
 int
-sdb_fe_fetch(sdb_conn_t *conn, const char *name)
+sdb_fe_fetch(sdb_conn_t *conn)
 {
-	sdb_strbuf_t *buf;
+	char name[conn->cmd_len + 1];
+	uint32_t type;
+
+	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;
+	}
+
+	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';
+	/* TODO: support other types besides hosts */
+	return sdb_fe_exec_fetch(conn, (int)type, name, NULL, /* filter = */ NULL);
+} /* sdb_fe_fetch */
+
+int
+sdb_fe_list(sdb_conn_t *conn)
+{
+	uint32_t type = SDB_HOST;
+
+	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;
+	}
+	return sdb_fe_exec_list(conn, (int)type, /* filter = */ NULL);
+} /* sdb_fe_list */
+
+int
+sdb_fe_lookup(sdb_conn_t *conn)
+{
+	sdb_store_matcher_t *m;
+	const char *matcher;
+	size_t matcher_len;
+
+	uint32_t type;
+	int status;
+
+	conn_matcher_t m_node = {
+		{ SDB_OBJECT_INIT, SDB_CONNECTION_MATCHER }, NULL
+	};
+	conn_lookup_t node = {
+		{ SDB_OBJECT_INIT, SDB_CONNECTION_LOOKUP },
+		-1, &m_node, NULL
+	};
+
+	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_fe_parse_matcher(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;
+	}
+
+	node.type = (int)type;
+	m_node.matcher = m;
+
+	/* run analyzer separately; parse_matcher is missing
+	 * the right context to do so */
+	if (sdb_fe_analyze(SDB_CONN_NODE(&node), 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 = sdb_fe_exec_lookup(conn, (int)type, m, /* filter = */ NULL);
+	sdb_object_deref(SDB_OBJ(m));
+	return status;
+} /* sdb_fe_lookup */
+
+/*
+ * TODO: let the functions above build an AST; then drop sdb_fe_exec_*.
+ */
+
+int
+sdb_fe_exec_fetch(sdb_conn_t *conn, int type,
+		const char *hostname, const char *name, sdb_store_matcher_t *filter)
+{
+	uint32_t res_type = htonl(SDB_CONNECTION_FETCH);
+
 	sdb_store_obj_t *host;
+	sdb_store_obj_t *obj;
 
-	host = sdb_store_get_host(name);
-	if (! host) {
-		sdb_log(SDB_LOG_DEBUG, "frontend: Failed to fetch host '%s': "
-				"not found", name);
+	sdb_store_json_formatter_t *f;
+	sdb_strbuf_t *buf;
 
-		sdb_strbuf_sprintf(conn->errbuf, "Host %s not found", name);
+	if ((! hostname) || ((type == SDB_HOST) && name)
+			|| ((type != SDB_HOST) && (! name))) {
+		/* This is a programming error, not something the client did wrong */
+		sdb_strbuf_sprintf(conn->errbuf, "INTERNAL ERROR: invalid "
+				"arguments to sdb_fe_exec_fetch(%s, %s, %s)",
+				SDB_STORE_TYPE_TO_NAME(type), hostname, name);
 		return -1;
 	}
+	if (type == SDB_HOST)
+		name = hostname;
+
+	host = sdb_store_get_host(hostname);
+	if ((! host) || (filter
+				&& (! sdb_store_matcher_matches(filter, host, NULL)))) {
+		sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s: "
+				"host %s not found", SDB_STORE_TYPE_TO_NAME(type),
+				name, hostname);
+		sdb_object_deref(SDB_OBJ(host));
+		return -1;
+	}
+	if (type == SDB_HOST) {
+		obj = host;
+	}
+	else {
+		obj = sdb_store_get_child(host, type, name);
+		if ((! obj) || (filter
+					&& (! sdb_store_matcher_matches(filter, obj, NULL)))) {
+			sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s.%s: "
+					"%s not found", SDB_STORE_TYPE_TO_NAME(type),
+					hostname, name, name);
+			if (obj)
+				sdb_object_deref(SDB_OBJ(obj));
+			sdb_object_deref(SDB_OBJ(host));
+			return -1;
+		}
+		sdb_object_deref(SDB_OBJ(host));
+	}
+	host = NULL;
 
 	buf = sdb_strbuf_create(1024);
 	if (! buf) {
@@ -96,29 +323,49 @@ sdb_fe_fetch(sdb_conn_t *conn, const char *name)
 
 		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 		sdb_strbuf_destroy(buf);
-		sdb_object_deref(SDB_OBJ(host));
+		sdb_object_deref(SDB_OBJ(obj));
+		return -1;
+	}
+	f = sdb_store_json_formatter(buf, type, /* flags = */ 0);
+	if (! f) {
+		char errbuf[1024];
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+				"JSON formatter 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(obj));
 		return -1;
 	}
 
-	if (sdb_store_host_tojson(host, buf, /* flags = */ 0)) {
+	sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
+	if (sdb_store_json_emit_full(f, obj, filter)) {
 		sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
-				"host '%s' to JSON", name);
+				"%s %s.%s to JSON", SDB_STORE_TYPE_TO_NAME(type),
+				hostname, name);
 		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 		sdb_strbuf_destroy(buf);
-		sdb_object_deref(SDB_OBJ(host));
+		free(f);
+		sdb_object_deref(SDB_OBJ(obj));
 		return -1;
 	}
+	sdb_store_json_finish(f);
 
-	sdb_connection_send(conn, CONNECTION_OK,
+	sdb_connection_send(conn, SDB_CONNECTION_DATA,
 			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 	sdb_strbuf_destroy(buf);
-	sdb_object_deref(SDB_OBJ(host));
+	free(f);
+	sdb_object_deref(SDB_OBJ(obj));
 	return 0;
-} /* sdb_fe_fetch */
+} /* sdb_fe_exec_fetch */
 
 int
-sdb_fe_list(sdb_conn_t *conn)
+sdb_fe_exec_list(sdb_conn_t *conn, int type, sdb_store_matcher_t *filter)
 {
+	uint32_t res_type = htonl(SDB_CONNECTION_LIST);
+
+	sdb_store_json_formatter_t *f;
 	sdb_strbuf_t *buf;
 
 	buf = sdb_strbuf_create(1024);
@@ -132,24 +379,43 @@ sdb_fe_list(sdb_conn_t *conn)
 		sdb_strbuf_destroy(buf);
 		return -1;
 	}
+	f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
+	if (! f) {
+		char errbuf[1024];
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+				"JSON formatter to handle LIST command: %s",
+				sdb_strerror(errno, errbuf, sizeof(errbuf)));
 
-	if (sdb_store_tojson(buf, /* flags = */ SDB_SKIP_ALL)) {
+		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
+		sdb_strbuf_destroy(buf);
+		return -1;
+	}
+
+	sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
+	if (sdb_store_scan(type, /* m = */ NULL, filter, list_tojson, f)) {
 		sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 				"store to JSON");
 		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 		sdb_strbuf_destroy(buf);
+		free(f);
 		return -1;
 	}
+	sdb_store_json_finish(f);
 
-	sdb_connection_send(conn, CONNECTION_OK,
+	sdb_connection_send(conn, SDB_CONNECTION_DATA,
 			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 	sdb_strbuf_destroy(buf);
+	free(f);
 	return 0;
-} /* sdb_fe_list */
+} /* sdb_fe_exec_list */
 
 int
-sdb_fe_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m)
+sdb_fe_exec_lookup(sdb_conn_t *conn, int type,
+		sdb_store_matcher_t *m, sdb_store_matcher_t *filter)
 {
+	uint32_t res_type = htonl(SDB_CONNECTION_LOOKUP);
+
+	sdb_store_json_formatter_t *f;
 	sdb_strbuf_t *buf;
 
 	buf = sdb_strbuf_create(1024);
@@ -159,27 +425,73 @@ sdb_fe_lookup(sdb_conn_t *conn, sdb_store_matcher_t *m)
 				"buffer to handle LOOKUP command: %s",
 				sdb_strerror(errno, errbuf, sizeof(errbuf)));
 
+		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
+		return -1;
+	}
+	f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
+	if (! f) {
+		char errbuf[1024];
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
+				"JSON formatter to handle LOOKUP command: %s",
+				sdb_strerror(errno, errbuf, sizeof(errbuf)));
+
 		sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 		sdb_strbuf_destroy(buf);
 		return -1;
 	}
 
-	sdb_strbuf_append(buf, "[");
+	sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 
-	if (sdb_store_lookup(m, lookup_tojson, buf)) {
-		sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
-		sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
+	if (sdb_store_scan(type, m, filter, lookup_tojson, f)) {
+		sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup %ss",
+				SDB_STORE_TYPE_TO_NAME(type));
+		sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup %ss",
+				SDB_STORE_TYPE_TO_NAME(type));
 		sdb_strbuf_destroy(buf);
+		free(f);
+		return -1;
+	}
+	sdb_store_json_finish(f);
+
+	sdb_connection_send(conn, SDB_CONNECTION_DATA,
+			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
+	sdb_strbuf_destroy(buf);
+	free(f);
+	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(SDB_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_append(buf, "]");
+	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_OK,
+	sdb_connection_send(conn, SDB_CONNECTION_DATA,
 			(uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 	sdb_strbuf_destroy(buf);
 	return 0;
-} /* sdb_fe_lookup */
+} /* sdb_fe_exec_timeseries */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */