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/*
grive: an GPL program to sync a local directory with Google Drive
Copyright (C) 2012 Wan Wai Ho
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation version 2
of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "State.hh"
#include "Entry.hh"
#include "Resource.hh"
#include "CommonUri.hh"
#include "http/Agent.hh"
#include "http/Header.hh"
#include "util/Crypt.hh"
#include "util/log/Log.hh"
#include "protocol/Json.hh"
#include <fstream>
namespace gr {
State::State( const fs::path& filename, const Json& options ) :
m_cstamp( -1 )
{
Read( filename ) ;
// the "-f" option will make grive always thinks remote is newer
Json force ;
if ( options.Get("force", force) && force.Bool() )
m_last_sync = DateTime() ;
Log( "last sync time: %1%", m_last_sync, log::verbose ) ;
}
State::~State()
{
}
/// Synchronize local directory. Build up the resource tree from files and folders
/// of local directory.
void State::FromLocal( const fs::path& p )
{
FromLocal( p, m_res.Root() ) ;
}
bool State::IsIgnore( const std::string& filename )
{
return filename[0] == '.' ;
}
void State::FromLocal( const fs::path& p, gr::Resource* folder )
{
assert( folder != 0 ) ;
assert( folder->IsFolder() ) ;
// sync the folder itself
folder->FromLocal( m_last_sync ) ;
for ( fs::directory_iterator i( p ) ; i != fs::directory_iterator() ; ++i )
{
std::string fname = Path2Str(i->path().filename()) ;
if ( IsIgnore(fname) )
Log( "file %1% is ignored by grive", fname, log::verbose ) ;
// check for broken symblic links
else if ( !fs::exists( i->path() ) )
Log( "file %1% doesn't exist (broken link?), ignored", i->path(), log::verbose ) ;
else
{
// if the Resource object of the child already exists, it should
// have been so no need to do anything here
Resource *c = folder->FindChild( fname ) ;
if ( c == 0 )
{
c = new Resource( fname, fs::is_directory(i->path()) ? "folder" : "file" ) ;
folder->AddChild( c ) ;
m_res.Insert( c ) ;
}
c->FromLocal( m_last_sync ) ;
if ( fs::is_directory( i->path() ) )
FromLocal( *i, c ) ;
}
}
}
void State::FromRemote( const Entry& e )
{
std::string fn = e.Filename() ;
if ( IsIgnore( e.Name() ) )
Log( "%1% %2% is ignored by grive", e.Kind(), e.Name(), log::verbose ) ;
// common checkings
else if ( e.Kind() != "folder" && (fn.empty() || e.ContentSrc().empty()) )
Log( "%1% \"%2%\" is a google document, ignored", e.Kind(), e.Name(), log::verbose ) ;
else if ( fn.find('/') != fn.npos )
Log( "%1% \"%2%\" contains a slash in its name, ignored", e.Kind(), e.Name(), log::verbose ) ;
else if ( !e.IsChange() && e.ParentHrefs().size() != 1 )
Log( "%1% \"%2%\" has multiple parents, ignored", e.Kind(), e.Name(), log::verbose ) ;
else if ( e.IsChange() )
FromChange( e ) ;
else if ( !Update( e ) )
{
m_unresolved.push_back( e ) ;
}
}
void State::ResolveEntry()
{
while ( !m_unresolved.empty() )
{
if ( TryResolveEntry() == 0 )
break ;
}
}
std::size_t State::TryResolveEntry()
{
assert( !m_unresolved.empty() ) ;
std::size_t count = 0 ;
std::vector<Entry>& en = m_unresolved ;
for ( std::vector<Entry>::iterator i = en.begin() ; i != en.end() ; )
{
if ( Update( *i ) )
{
i = en.erase( i ) ;
count++ ;
}
else
++i ;
}
return count ;
}
void State::FromChange( const Entry& e )
{
assert( e.IsChange() ) ;
assert( !IsIgnore( e.Name() ) ) ;
// entries in the change feed is always treated as newer in remote,
// so we override the last sync time to 0
if ( Resource *res = m_res.FindByHref( e.AltSelf() ) )
m_res.Update( res, e, DateTime() ) ;
}
bool State::Update( const Entry& e )
{
assert( !e.IsChange() ) ;
assert( !e.ParentHref().empty() ) ;
if ( Resource *res = m_res.FindByHref( e.SelfHref() ) )
{
m_res.Update( res, e, m_last_sync ) ;
return true ;
}
else if ( Resource *parent = m_res.FindByHref( e.ParentHref() ) )
{
assert( parent->IsFolder() ) ;
// see if the entry already exist in local
std::string name = e.Name() ;
Resource *child = parent->FindChild( name ) ;
if ( child != 0 )
{
// since we are updating the ID and Href, we need to remove it and re-add it.
m_res.Update( child, e, m_last_sync ) ;
}
// folder entry exist in google drive, but not local. we should create
// the directory
else if ( e.Kind() == "folder" || !e.Filename().empty() )
{
// first create a dummy resource and update it later
child = new Resource( name, e.Kind() ) ;
parent->AddChild( child ) ;
m_res.Insert( child ) ;
// update the state of the resource
m_res.Update( child, e, m_last_sync ) ;
}
return true ;
}
else
return false ;
}
Resource* State::FindByHref( const std::string& href )
{
return m_res.FindByHref( href ) ;
}
Resource* State::Find( const fs::path& path )
{
return m_res.FindByPath( path ) ;
}
State::iterator State::begin()
{
return m_res.begin() ;
}
State::iterator State::end()
{
return m_res.end() ;
}
void State::Read( const fs::path& filename )
{
try
{
Json json = Json::ParseFile( filename.string() ) ;
Json last_sync = json["last_sync"] ;
m_last_sync.Assign(
last_sync["sec"].Int(),
last_sync["nsec"].Int() ) ;
m_cstamp = json["change_stamp"].Int() ;
}
catch ( Exception& )
{
m_last_sync.Assign(0) ;
}
}
void State::Write( const fs::path& filename ) const
{
Json last_sync ;
last_sync.Add( "sec", Json(m_last_sync.Sec() ) );
last_sync.Add( "nsec", Json(m_last_sync.NanoSec() ) );
Json result ;
result.Add( "last_sync", last_sync ) ;
result.Add( "change_stamp", Json(m_cstamp) ) ;
std::ofstream fs( filename.string().c_str() ) ;
fs << result ;
}
void State::Sync( http::Agent *http, const http::Header& auth )
{
// set the last sync time from the time returned by the server for the last file synced
// if the sync time hasn't changed (i.e. now files have been uploaded)
// set the last sync time to the time on the client
// ideally because we compare server file times to the last sync time
// the last sync time would always be a server time rather than a client time
// TODO - WARNING - do we use the last sync time to compare to client file times
// need to check if this introduces a new problem
DateTime last_sync_time = m_last_sync;
m_res.Root()->Sync( http, auth, last_sync_time ) ;
if (last_sync_time == m_last_sync) {
m_last_sync = DateTime::Now();
} else {
m_last_sync = last_sync_time;
}
}
long State::ChangeStamp() const
{
return m_cstamp ;
}
void State::ChangeStamp( long cstamp )
{
Log( "change stamp is set to %1%", cstamp, log::verbose ) ;
m_cstamp = cstamp ;
}
} // end of namespace
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