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#include "network.h"
#include "identity.h"
#include <cstring>
#include <ifaddrs.h>
#include <net/if.h>
#include <unistd.h>
using std::scoped_lock;
using std::unique_lock;
using std::unique_ptr;
using namespace erebos;
Server::Server(const Identity & self):
p(new Priv(self))
{
}
Server::~Server() = default;
Server::Priv::Priv(const Identity & self):
self(self)
{
struct ifaddrs * raddrs;
if (getifaddrs(&raddrs) < 0)
throw std::system_error(errno, std::generic_category());
unique_ptr<ifaddrs, void(*)(ifaddrs *)> addrs(raddrs, freeifaddrs);
for (struct ifaddrs * ifa = addrs.get(); ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET &&
ifa->ifa_flags & IFF_BROADCAST) {
bcastAddresses.push_back(((sockaddr_in*)ifa->ifa_broadaddr)->sin_addr);
}
}
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
throw std::system_error(errno, std::generic_category());
int enable = 1;
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST,
&enable, sizeof(enable)) < 0)
throw std::system_error(errno, std::generic_category());
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
&enable, sizeof(enable)) < 0)
throw std::system_error(errno, std::generic_category());
sockaddr_in laddr = {};
laddr.sin_family = AF_INET;
laddr.sin_port = htons(discoveryPort);
if (bind(sock, (sockaddr *) &laddr, sizeof(laddr)) < 0)
throw std::system_error(errno, std::generic_category());
threadListen = thread([this] { doListen(); });
threadAnnounce = thread([this] { doAnnounce(); });
}
Server::Priv::~Priv()
{
{
scoped_lock lock(dataMutex);
finish = true;
}
announceCondvar.notify_all();
threadListen.join();
threadAnnounce.join();
if (sock >= 0)
close(sock);
}
void Server::Priv::doListen()
{
}
void Server::Priv::doAnnounce()
{
unique_lock<mutex> lock(dataMutex);
auto lastAnnounce = steady_clock::now() - announceInterval;
while (!finish) {
auto now = steady_clock::now();
if (lastAnnounce + announceInterval < now) {
TransportHeader header({
{ TransportHeader::Type::AnnounceSelf, *self.ref() }
});
vector<uint8_t> bytes = header.store(self.ref()->storage())->encode();
for (const auto & in : bcastAddresses) {
sockaddr_in sin = {};
sin.sin_family = AF_INET;
sin.sin_addr = in;
sin.sin_port = htons(discoveryPort);
sendto(sock, bytes.data(), bytes.size(), 0, (sockaddr *) &sin, sizeof(sin));
}
lastAnnounce += announceInterval * ((now - lastAnnounce) / announceInterval);
}
announceCondvar.wait_until(lock, lastAnnounce + announceInterval);
}
}
optional<TransportHeader> TransportHeader::load(const Ref & ref)
{
auto rec = ref->asRecord();
if (!rec)
return nullopt;
vector<Item> items;
for (const auto & item : rec->items()) {
if (item.name == "ACK") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::Acknowledged,
.value = *ref,
});
} else if (item.name == "REQ") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::DataRequest,
.value = *ref,
});
} else if (item.name == "RSP") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::DataResponse,
.value = *ref,
});
} else if (item.name == "ANN") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::AnnounceSelf,
.value = *ref,
});
} else if (item.name == "ANU") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::AnnounceUpdate,
.value = *ref,
});
} else if (item.name == "CRQ") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::ChannelRequest,
.value = *ref,
});
} else if (item.name == "CAC") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::ChannelAccept,
.value = *ref,
});
} else if (item.name == "STP") {
if (auto val = item.asText())
items.emplace_back(Item {
.type = Type::ServiceType,
.value = *val,
});
} else if (item.name == "SRF") {
if (auto ref = item.asRef())
items.emplace_back(Item {
.type = Type::ServiceRef,
.value = *ref,
});
}
}
return TransportHeader { .items = items };
}
Ref TransportHeader::store(const Storage & st) const
{
vector<Record::Item> ritems;
for (const auto & item : items) {
switch (item.type) {
case Type::Acknowledged:
ritems.emplace_back("ACK", std::get<Ref>(item.value));
break;
case Type::DataRequest:
ritems.emplace_back("REQ", std::get<Ref>(item.value));
break;
case Type::DataResponse:
ritems.emplace_back("RSP", std::get<Ref>(item.value));
break;
case Type::AnnounceSelf:
ritems.emplace_back("ANN", std::get<Ref>(item.value));
break;
case Type::AnnounceUpdate:
ritems.emplace_back("ANU", std::get<Ref>(item.value));
break;
case Type::ChannelRequest:
ritems.emplace_back("CRQ", std::get<Ref>(item.value));
break;
case Type::ChannelAccept:
ritems.emplace_back("CAC", std::get<Ref>(item.value));
break;
case Type::ServiceType:
ritems.emplace_back("STP", std::get<string>(item.value));
break;
case Type::ServiceRef:
ritems.emplace_back("SRF", std::get<Ref>(item.value));
break;
}
}
return st.storeObject(Record(std::move(ritems)));
}
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