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Minor improvements to media request / announce code

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I had to throw away the code switching sendRequestedMedia to
a bin packing algorithm because it actually performed worse. :(
This commit is contained in:
sfan5 2024-01-20 13:24:54 +01:00
parent 13013d1b8b
commit 362e4505e8
1 changed files with 35 additions and 22 deletions
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57
src/server.cpp
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@ -2628,28 +2628,30 @@ void Server::fillMediaCache()
void Server::sendMediaAnnouncement(session_t peer_id, const std::string &lang_code)
{
std::string lang_suffix = ".";
lang_suffix.append(lang_code).append(".tr");
auto include = [&] (const std::string &name, const MediaInfo &info) -> bool {
if (info.no_announce)
return false;
if (str_ends_with(name, ".tr") && !str_ends_with(name, lang_suffix))
return false;
return true;
};
// Make packet
NetworkPacket pkt(TOCLIENT_ANNOUNCE_MEDIA, 0, peer_id);
u16 media_sent = 0;
std::string lang_suffix;
lang_suffix.append(".").append(lang_code).append(".tr");
for (const auto &i : m_media) {
if (i.second.no_announce)
continue;
if (str_ends_with(i.first, ".tr") && !str_ends_with(i.first, lang_suffix))
continue;
media_sent++;
if (include(i.first, i.second))
media_sent++;
}
pkt << media_sent;
for (const auto &i : m_media) {
if (i.second.no_announce)
continue;
if (str_ends_with(i.first, ".tr") && !str_ends_with(i.first, lang_suffix))
continue;
pkt << i.first << i.second.sha1_digest;
if (include(i.first, i.second))
pkt << i.first << i.second.sha1_digest;
}
pkt << g_settings->get("remote_media");
@ -2659,10 +2661,12 @@ void Server::sendMediaAnnouncement(session_t peer_id, const std::string &lang_co
<< "): count=" << media_sent << " size=" << pkt.getSize() << std::endl;
}
namespace {
struct SendableMedia
{
std::string name;
std::string path;
const std::string &name;
const std::string &path;
std::string data;
SendableMedia(const std::string &name, const std::string &path,
@ -2671,6 +2675,8 @@ struct SendableMedia
{}
};
}
void Server::sendRequestedMedia(session_t peer_id,
const std::unordered_set<std::string> &tosend)
{
@ -2680,16 +2686,22 @@ void Server::sendRequestedMedia(session_t peer_id,
infostream << "Server::sendRequestedMedia(): Sending "
<< tosend.size() << " files to " << client->getName() << std::endl;
/* Read files */
/* Read files and prepare bunches */
// Put 5kB in one bunch (this is not accurate)
// Put 5KB in one bunch (this is not accurate)
// This is a tradeoff between burdening the network with too many packets
// and burdening it with too large split packets.
const u32 bytes_per_bunch = 5000;
std::vector<std::vector<SendableMedia>> file_bunches;
file_bunches.emplace_back();
u32 file_size_bunch_total = 0;
// Note that applying a "real" bin packing algorithm here is not necessarily
// an improvement (might even perform worse) since games usually have lots
// of files larger than 5KB and the current algorithm already minimized
// the amount of bunches quite well (at the expense of overshooting).
u32 file_size_bunch_total = 0;
for (const std::string &name : tosend) {
auto it = m_media.find(name);
@ -2728,7 +2740,6 @@ void Server::sendRequestedMedia(session_t peer_id,
file_bunches.emplace_back();
file_size_bunch_total = 0;
}
}
/* Create and send packets */
@ -2747,18 +2758,20 @@ void Server::sendRequestedMedia(session_t peer_id,
data
}
*/
NetworkPacket pkt(TOCLIENT_MEDIA, 4 + 0, peer_id);
pkt << num_bunches << i << (u32) file_bunches[i].size();
const u32 bunch_size = bunch.size();
pkt << num_bunches << i << bunch_size;
for (auto &j : bunch) {
pkt << j.name;
pkt.putLongString(j.data);
}
bunch.clear(); // free memory early
verbosestream << "Server::sendRequestedMedia(): bunch "
<< i << "/" << num_bunches
<< " files=" << bunch.size()
<< " files=" << bunch_size
<< " size=" << pkt.getSize() << std::endl;
Send(&pkt);
}