blob: 2298b3bf189d63af9d8b883554d2bf9fc8074e2d [file] [log] [blame]
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define C_LUCY_INDEXFILENAMES
#include "Lucy/Util/ToolSet.h"
#include "Lucy/Util/IndexFileNames.h"
#include "Lucy/Store/DirHandle.h"
#include "Lucy/Store/Folder.h"
#include "Lucy/Util/StringHelper.h"
String*
IxFileNames_latest_snapshot(Folder *folder) {
DirHandle *dh = Folder_Open_Dir(folder, NULL);
String *retval = NULL;
uint64_t latest_gen = 0;
if (!dh) { RETHROW(INCREF(Err_get_error())); }
while (DH_Next(dh)) {
String *entry = DH_Get_Entry(dh);
if (Str_Starts_With_Utf8(entry, "snapshot_", 9)
&& Str_Ends_With_Utf8(entry, ".json", 5)
) {
uint64_t gen = IxFileNames_extract_gen(entry);
if (gen > latest_gen) {
latest_gen = gen;
DECREF(retval);
retval = Str_Clone(entry);
}
}
DECREF(entry);
}
DECREF(dh);
return retval;
}
uint64_t
IxFileNames_extract_gen(String *name) {
StringIterator *iter = Str_Top(name);
// Advance past first underscore. Bail if we run out of string or if we
// encounter a NULL.
while (1) {
int32_t code_point = StrIter_Next(iter);
if (code_point == STR_OOB) { return 0; }
else if (code_point == '_') { break; }
}
String *num_string = StrIter_crop(iter, NULL);
uint64_t retval = (uint64_t)Str_BaseX_To_I64(num_string, 36);
DECREF(num_string);
DECREF(iter);
return retval;
}
String*
IxFileNames_make_temp_snapshot(uint64_t gen) {
char base36[StrHelp_MAX_BASE36_BYTES];
StrHelp_to_base36(gen, &base36);
return Str_newf("snapshot_%s.json.temp", &base36);
}
String*
IxFileNames_local_part(String *path) {
StringIterator *top = Str_Tail(path);
int32_t code_point = StrIter_Prev(top);
// Trim trailing slash.
while (code_point == '/') {
code_point = StrIter_Prev(top);
}
StringIterator *tail = StrIter_Clone(top);
StrIter_Advance(tail, 1);
// Substring should start after last slash.
while (code_point != STR_OOB) {
if (code_point == '/') {
StrIter_Advance(top, 1);
break;
}
code_point = StrIter_Prev(top);
}
String *retval = StrIter_crop(top, tail);
DECREF(tail);
DECREF(top);
return retval;
}