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content.cpp
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content.cpp
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/*
* content.cpp
* Superclass of FileTransfer and LiveTransfer
*
* Created by Arno Bakker.
* Copyright 2009-2016 TECHNISCHE UNIVERSITEIT DELFT. All rights reserved.
*/
#include "swift.h"
#include <cfloat>
#include "swarmmanager.h"
#include <event2/http.h>
using namespace swift;
/*
* Class variables
*/
struct event ContentTransfer::evclean;
uint64_t ContentTransfer::cleancounter = 0;
/*
* Local Constants
*/
#define CHANNEL_GARBAGECOLLECT_INTERVAL 5 // seconds, or GlobalCleanCallback calls actually
#define TRANSFER_IDLE_CHECK_DEACTIVATE_INTERVAL 30 // seconds, or GlobalCleanCallback calls actually
#define TRACKER_RETRY_INTERVAL_START (5*TINT_SEC)
#define TRACKER_RETRY_INTERVAL_EXP 1.1 // exponent used to increase INTERVAL_START
#define TRACKER_RETRY_INTERVAL_MAX (1800*TINT_SEC) // 30 minutes
ContentTransfer::ContentTransfer(transfer_t ttype) : ttype_(ttype),
swarm_id_(), mychannels_(), callbacks_(), picker_(NULL),
speedupcount_(0), speeddwcount_(0), trackerurl_(),
tracker_retry_interval_(TRACKER_RETRY_INTERVAL_START),
tracker_retry_time_(NOW),
slow_start_hints_(0),
ext_tracker_client_(NULL)
{
cur_speed_[DDIR_UPLOAD] = MovingAverageSpeed();
cur_speed_[DDIR_DOWNLOAD] = MovingAverageSpeed();
max_speed_[DDIR_UPLOAD] = DBL_MAX;
max_speed_[DDIR_DOWNLOAD] = DBL_MAX;
}
ContentTransfer::~ContentTransfer()
{
dprintf("%s F%d content deconstructor\n",tintstr(),td_);
CloseChannels(mychannels_,true);
if (storage_ != NULL)
delete storage_;
if (ext_tracker_client_ != NULL)
{
delete ext_tracker_client_;
ext_tracker_client_ = NULL;
}
}
void ContentTransfer::CloseChannels(channels_t delset,bool isall)
{
channels_t::iterator iter;
for (iter=delset.begin(); iter!=delset.end(); iter++)
{
Channel *c = *iter;
dprintf("%s F%d content close chans\n",tintstr(),td_);
c->Close(CLOSE_SEND_IF_ESTABLISHED);
if (isall)
c->ClearTransfer();
delete c;
// ~Channel removes it from Channel::channels and mychannels_.erase(c);
}
}
// SAFECLOSE
void ContentTransfer::GarbageCollectChannels()
{
// STL and MS and conditional delete from set not a happy place :-(
channels_t delset;
channels_t::iterator iter;
uint32_t numestablishedpeers=0;
bool movingforward=false;
for (iter=mychannels_.begin(); iter!=mychannels_.end(); iter++)
{
Channel *c = *iter;
if (c != NULL)
{
if (c->IsScheduled4Delete())
delset.push_back(c);
if (c->is_established ())
{
numestablishedpeers++;
// Moving forward is when any channel is moving forward
if (c->IsMovingForward())
movingforward = true;
}
}
}
//dprintf("%s F%d content gc chans\n",tintstr(),td_);
CloseChannels(delset,false);
/*
* If we have no peers left, see if we can get some more (if not seed)
*/
if (numestablishedpeers == 0)
movingforward = false;
// Arno, 2013-09-11: Don't pull extra for peers when seeder and external tracker
bool complete = (swift::Complete(td_) > 0 && (swift::Complete(td_) == swift::Size(td_)) );
if (complete && ext_tracker_client_ != NULL) // seed, periodic rereg helps find leechers
movingforward = true;
// Arno, 2012-02-24: Check for liveliness.
ReConnectToTrackerIfAllowed(movingforward);
}
// Global method
void ContentTransfer::LibeventGlobalCleanCallback(int fd, short event, void *arg)
{
//fprintf(stderr,"ContentTransfer::GlobalCleanCallback %" PRIu64 "\n", ContentTransfer::cleancounter );
// Arno, 2012-02-24: Why-oh-why, update NOW
Channel::Time();
if ((ContentTransfer::cleancounter % TRANSFER_IDLE_CHECK_DEACTIVATE_INTERVAL) == 0) {
// Deactivate FileTransfers that have been idle too long. Including zerostate
SwarmManager::GetManager().DeactivateIdleSwarms();
}
tdlist_t tds = GetTransferDescriptors();
tdlist_t::iterator iter;
for (iter = tds.begin(); iter != tds.end(); iter++)
{
int td = *iter;
ContentTransfer *ct = swift::GetActivatedTransfer(td);
if (ct == NULL)
continue; // not activated, don't bother
// Update speed measurements such that they decrease when DL/UL stops
// Always. Must be done on 1 s interval
ct->OnRecvNoData();
ct->OnSendNoData();
// Arno: Call garage collect only once every CHANNEL_GARBAGECOLLECT_INTERVAL
if ((ContentTransfer::cleancounter % CHANNEL_GARBAGECOLLECT_INTERVAL) == 0)
ct->GarbageCollectChannels();
// Some external trackers need periodic reports
if (ct->ext_tracker_client_ != NULL)
{
tint report_time = ct->ext_tracker_client_->GetReportLastTime() + (TINT_SEC*ct->ext_tracker_client_->GetReportInterval());
if (NOW > report_time)
{
fprintf(stderr,"content: periodic ConnectToTracker\n");
ct->ConnectToTracker();
}
}
}
ContentTransfer::cleancounter++;
// Arno, 2012-10-01: Reschedule cleanup, started in swift::Open
evtimer_add(&ContentTransfer::evclean,tint2tv(TINT_SEC));
}
void ContentTransfer::ReConnectToTrackerIfAllowed(bool movingforward)
{
// fprintf(stderr,"%s F%d content reconnect to tracker: movingfwd %s\n",tintstr(),td_,(movingforward ? "true":"false") );
// If I'm not connected to any
// peers, try to contact the tracker again.
if (!movingforward)
{
if (NOW > tracker_retry_time_)
{
fprintf(stderr,"content: -movingforward ConnectToTracker\n");
ConnectToTracker();
// Should be: if fail then exp backoff
tracker_retry_interval_ *= TRACKER_RETRY_INTERVAL_EXP;
if (tracker_retry_interval_ > TRACKER_RETRY_INTERVAL_MAX)
tracker_retry_interval_ = TRACKER_RETRY_INTERVAL_MAX;
tracker_retry_time_ = NOW + tracker_retry_interval_;
}
}
else
{
tracker_retry_interval_ = TRACKER_RETRY_INTERVAL_START;
tracker_retry_time_ = NOW + tracker_retry_interval_;
}
}
/** Called by ExternalTrackerClient when results come in from the server */
static void global_bttracker_callback(int td, std::string status, uint32_t interval, peeraddrs_t peerlist)
{
//fprintf(stderr,"content global_bttracker_callback: td %d status %s int %" PRIu32 " npeers %" PRIu32 "\n", td, status.c_str(), interval, peerlist.size() );
ContentTransfer *ct = swift::GetActivatedTransfer(td);
if (ct == NULL)
return; // not activated, don't bother
if (status == "")
{
// Success
dprintf("%s F%d content contact tracker: ext OK int %" PRIu32 " npeers " PRISIZET "\n",tintstr(),td,interval,peerlist.size() );
// Record reporting interval
ExternalTrackerClient *bttrackclient = ct->GetExternalTrackerClient();
if (bttrackclient != NULL) // unlikely
bttrackclient->SetReportInterval(interval);
// Attempt to create channels to peers
peeraddrs_t::iterator iter;
for (iter=peerlist.begin(); iter!=peerlist.end(); iter++)
{
Address addr = *iter;
ct->OnPexIn(addr);
}
}
else
{
dprintf("%s F%d content contact tracker: ext failure reason %s\n",tintstr(),td,status.c_str());
}
}
void ContentTransfer::ConnectToTracker(bool stop)
{
// dprintf("%s F%d content contact tracker\n",tintstr(),td_);
if (!IsOperational())
return;
struct evhttp_uri *evu = NULL;
if (trackerurl_ != "")
evu = evhttp_uri_parse(trackerurl_.c_str());
else
{
if (Channel::trackerurl == "")
{
// Testing
dprintf("%s F%d content contact tracker: No tracker defined\n",tintstr(),td_);
return;
}
evu = evhttp_uri_parse(Channel::trackerurl.c_str());
}
if (evu == NULL)
{
dprintf("%s F%d content contact tracker: failure parsing URL\n",tintstr(),td_);
return;
}
char buf[1024+1];
char *uricstr = evhttp_uri_join(evu,buf,1024);
dprintf("%s F%d content contact tracker: Tracker is %s scheme %s\n",tintstr(),td_,uricstr, evhttp_uri_get_scheme(evu));
std::string scheme = evhttp_uri_get_scheme(evu);
if (scheme == SWIFT_URI_SCHEME)
{
// swift tracker
const char *host = evhttp_uri_get_host(evu);
if (host == NULL)
{
dprintf("%s F%d content contact tracker: failure parsing URL host\n",tintstr(),td_);
return;
}
int port = evhttp_uri_get_port(evu);
Address trackaddr(host,port);
Channel *c = new Channel(this,INVALID_SOCKET,trackaddr);
}
else
{
// External tracker
std::string event = EXTTRACK_EVENT_WORKING;
if (ext_tracker_client_ == NULL)
{
// First call, create client
event = EXTTRACK_EVENT_STARTED;
if (trackerurl_ != "")
ext_tracker_client_ = new ExternalTrackerClient(trackerurl_);
else
ext_tracker_client_ = new ExternalTrackerClient(Channel::trackerurl);
}
else if (stop)
{
event = EXTTRACK_EVENT_STOPPED;
}
else if (!ext_tracker_client_->GetReportedComplete())
{
// Vulnerable to Automatic Size detection not being finished
if (swift::Complete(td()) > 0 && swift::Complete(td()) == swift::Size(td()))
event = EXTTRACK_EVENT_COMPLETED;
}
ext_tracker_client_->Contact(this,event,global_bttracker_callback);
}
evhttp_uri_free(evu);
}
bool ContentTransfer::OnPexIn (const Address& addr)
{
//fprintf(stderr,"ContentTransfer::OnPexIn: %s\n", addr.str().c_str() );
// Arno: this brings safety, but prevents private swift installations.
// TODO: detect public internet.
//if (addr.is_private())
// return false;
Address myaddr = Channel::BoundAddress(Channel::default_socket());
if (addr == myaddr)
return false; // Connect to self
channels_t::iterator iter;
for (iter=mychannels_.begin(); iter!=mychannels_.end(); iter++)
{
Channel *c = *iter;
if (c != NULL && c->peer()==addr)
return false; // already connected or connecting, Gertjan fix = return false
}
// Gertjan fix: PEX redo
if (mychannels_.size()<SWIFT_MAX_OUTGOING_CONNECTIONS)
new Channel(this,Channel::default_socket(),addr);
return true;
}
//Gertjan
Channel *ContentTransfer::RandomChannel(Channel *notc) {
channels_t choose_from;
channels_t::iterator iter;
for (iter=mychannels_.begin(); iter!=mychannels_.end(); iter++)
{
Channel *c = *iter;
if (c != NULL && c != notc && c->is_established())
choose_from.push_back(c);
}
if (choose_from.size() == 0)
return NULL;
return choose_from[rand() % choose_from.size()];
}
// RATELIMIT
void ContentTransfer::OnRecvData(int n)
{
speeddwcount_++;
uint32_t speed = cur_speed_[DDIR_DOWNLOAD].GetSpeedNeutral();
uint32_t rate = speed & ~1048575 ? 32:8;
if (speeddwcount_>=rate)
{
cur_speed_[DDIR_DOWNLOAD].AddPoint((uint64_t)n*rate);
speeddwcount_=0;
}
}
void ContentTransfer::OnSendData(int n)
{
speedupcount_++;
uint32_t speed = cur_speed_[DDIR_UPLOAD].GetSpeedNeutral();
uint32_t rate = speed & ~1048575 ? 32:8;
if (speedupcount_>=rate)
{
cur_speed_[DDIR_UPLOAD].AddPoint((uint64_t)n*rate);
speedupcount_ = 0;
}
}
void ContentTransfer::OnRecvNoData()
{
// AddPoint(0) everytime we don't AddData gives bad speed measurement
cur_speed_[DDIR_DOWNLOAD].AddPoint((uint64_t)0);
}
void ContentTransfer::OnSendNoData()
{
// AddPoint(0) everytime we don't SendData gives bad speed measurement
cur_speed_[DDIR_UPLOAD].AddPoint((uint64_t)0);
}
double ContentTransfer::GetCurrentSpeed(data_direction_t ddir)
{
return cur_speed_[ddir].GetSpeedNeutral();
}
void ContentTransfer::SetMaxSpeed(data_direction_t ddir, double m)
{
max_speed_[ddir] = m;
// Arno, 2012-01-04: Be optimistic, forget history.
cur_speed_[ddir].Reset();
}
double ContentTransfer::GetMaxSpeed(data_direction_t ddir)
{
return max_speed_[ddir];
}
//STATS
uint32_t ContentTransfer::GetNumLeechers()
{
uint32_t count = 0;
channels_t::iterator iter;
for (iter=mychannels_.begin(); iter!=mychannels_.end(); iter++)
{
Channel *c = *iter;
if (c != NULL)
if (!c->IsComplete()) // incomplete?
count++;
}
return count;
}
uint32_t ContentTransfer::GetNumSeeders()
{
uint32_t count = 0;
channels_t::iterator iter;
for (iter=mychannels_.begin(); iter!=mychannels_.end(); iter++)
{
Channel *c = *iter;
if (c != NULL)
if (c->IsComplete()) // complete?
count++;
}
return count;
}
void ContentTransfer::AddPeer(Address &peer)
{
Channel *c = new Channel(this,INVALID_SOCKET,peer);
}
Channel * ContentTransfer::FindChannel(const Address &addr, Channel *notc)
{
channels_t::iterator iter;
for (iter=mychannels_.begin(); iter!=mychannels_.end(); iter++)
{
Channel *c = *iter;
if (c != NULL) {
if (c != notc && (c->peer() == addr || c->recv_peer() == addr)) {
return c;
}
}
}
return NULL;
}
/*
* Progress Monitoring
*/
void ContentTransfer::AddProgressCallback(ProgressCallback cb, uint8_t agg) {
callbacks_.push_back( progcallbackreg_t( cb, agg ) );
}
void ContentTransfer::RemoveProgressCallback(ProgressCallback cb) {
progcallbackregs_t::iterator iter;
for (iter= callbacks_.begin(); iter != callbacks_.end(); iter++ ) {
if( (*iter).first == cb ) {
callbacks_.erase( iter );
return;
}
}
}
void ContentTransfer::Progress(bin_t bin) {
int minlayer = bin.layer();
// Arno, 2012-10-02: Callback may call RemoveCallback and thus mess up iterator, so use copy
progcallbackregs_t copycbs(callbacks_);
progcallbackregs_t::iterator iter;
for (iter=copycbs.begin(); iter != copycbs.end(); iter++ ) {
if( minlayer >= (*iter).second )
((*iter).first)( td_, bin );
}
}
void ContentTransfer::SetTD(int td)
{
td_ = td;
if (storage_ != NULL)
storage_->SetTD(td);
}