From 12aeb890c9a6ad329e3612ebb96d843d70e413c9 Mon Sep 17 00:00:00 2001 From: Ahmed Ammar Date: Wed, 15 Nov 2017 16:16:19 +0200 Subject: Implementation of delta-sync support on client-side. This commit adds client-side support for delta-sync, this adds a new 3rdparty submodule `gh:ahmedammar/zsync`. This zsync tree is a modified version of upstream, adding some needed support for the upload path and other requirements. If the server does not announce the required zsync capability then a full upload/download is fallen back to. Delta synchronization can be enabled/disabled using command line, config, or gui options. On both upload and download paths, a check is made for the existance of a zsync metadata file on the server for a given path. This is provided by a dav property called `zsync`, found during discovery phase. If it doesn't exist the code reverts back to a complete upload or download, i.e. previous implementations. In the case of upload, a new zsync metadata file will be uploaded as part of the chunked upload and future synchronizations will be delta-sync capable. Chunked uploads no longer use sequential file names for each chunk id, instead, they are named as the byte offset into the remote file, this is a minimally intrusive modification to allow fo delta-sync and legacy code paths to run seamlessly. A new http header OC-Total-File-Length is sent, which informs the server of the final expected size of the file not just the total transmitted bytes as reported by OC-Total-Length. The seeding and generation of the zsync metadata file is done in a separate thread since this is a cpu intensive task, ensuring main thread is not blocked. This commit closes owncloud/client#179. --- .gitmodules | 3 +++ 1 file changed, 3 insertions(+) (limited to '.gitmodules') diff --git a/.gitmodules b/.gitmodules index d25acc3cc..19d0e8349 100644 --- a/.gitmodules +++ b/.gitmodules @@ -7,3 +7,6 @@ [submodule "src/3rdparty/libcrashreporter-qt"] path = src/3rdparty/libcrashreporter-qt url = git://github.com/dschmidt/libcrashreporter-qt.git +[submodule "src/3rdparty/zsync"] + path = src/3rdparty/zsync + url = https://github.com/ahmedammar/zsync -- cgit v1.2.3