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FileLoader: add comment about FILE_UPLOAD_RESTART 

GitOrigin-RevId: e8fb51da493cacd00af5ec7585cd8a95b605838a
This commit is contained in:
Arseny Smirnov 2019-08-01 16:03:11 +03:00
parent b0ad2ad190
commit 331c8b52c1
1 changed files with 12 additions and 0 deletions
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12
td/telegram/files/FileLoader.cpp
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@ -98,6 +98,18 @@ void FileLoader::start_up() {
auto &ready_parts = file_info.ready_parts;
auto use_part_count_limit = file_info.use_part_count_limit;
bool is_upload = file_info.is_upload;
// Two cases when FILE_UPLOAD_RESTART will happen
// 1. File is ready, size is final. But there are more uploaded parts, than size of a file
//pm.init(1, 100000, true, 10, {0, 1, 2}, false, true).ensure_error();
// This error is definitely ok, because we are using actual size of file on disk (mtime is checked by somebody
// else). And actual size could change arbitrarily.
//
// 2. size is unknown/zero, size is not final, some parts of file are already uploaded
// pm.init(0, 100000, false, 10, {0, 1, 2}, false, true).ensure_error();
// This case is more complicated
// It means that at some point we got inconsistent state. Like deleted local location, but left partial remote
// locaiton untouched. This is completely possible at this point, but probably should be fixed.
auto status =
parts_manager_.init(size, expected_size, is_size_final, part_size, ready_parts, use_part_count_limit, is_upload);
if (status.is_error()) {