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#include "common.hh"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <cerrno>
#include <cstring>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include "config.hh"
#include "sender_client.hh"
namespace stuff {
namespace {
class SenderClientImpl : public SenderClient {
public:
SenderClientImpl()
: sock_(-1) {
}
~SenderClientImpl() override {
if (sock_ != -1) {
close(sock_);
}
}
bool open(const Config* config) {
if (!config) return false;
sender_ = config->get("sender", "");
if (sender_.empty()) return false;
return setup();
}
void send(const std::string& channel, const std::string& message) override {
struct timeval target;
gettimeofday(&target, NULL);
target.tv_sec += 5;
send(channel, message, &target);
}
private:
void send(const std::string& channel, const std::string& message,
const struct timeval* target) {
if (sock_ == -1) {
if (!setup()) return;
}
uint32_t size1 = channel.size();
uint32_t size2 = message.size();
size_t pos = 0, len = 8 + size1 + size2;
size1 = htonl(size1);
size2 = htonl(size2);
while (pos < len) {
ssize_t ret;
if (pos < 4) {
size_t const avail = 4 - pos;
ret = write(sock_,
reinterpret_cast<char*>(&size1) + pos, avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
} else if (pos < 4 + channel.size()) {
size_t const avail = 4 + channel.size() - pos;
ret = write(sock_, channel.data() + (pos - 4), avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
} else if (pos < 8 + channel.size()) {
size_t const avail = 8 + channel.size() - pos;
ret = write(sock_,
reinterpret_cast<char*>(&size2) + pos, avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
} else {
size_t const avail = len - pos;
ret = write(sock_, message.data() + (pos - 8 - channel.size()),
avail);
if (ret > 0) {
pos += ret;
if (static_cast<size_t>(ret) == avail) continue;
}
}
if (ret < 0) {
if (errno == EINTR) continue;
if (errno != EAGAIN && errno != EWOULDBLOCK) {
close(sock_);
sock_ = -1;
return send(channel, message);
}
}
fd_set write_set;
FD_ZERO(&write_set);
FD_SET(sock_, &write_set);
while (true) {
struct timeval timeout;
gettimeofday(&timeout, NULL);
if (target->tv_sec == timeout.tv_sec) {
timeout.tv_sec = 0;
if (target->tv_usec > timeout.tv_usec) {
timeout.tv_usec = target->tv_usec - timeout.tv_usec;
} else {
timeout.tv_usec = 0;
}
} else if (target->tv_sec > timeout.tv_sec) {
timeout.tv_sec = target->tv_sec - timeout.tv_sec;
if (target->tv_usec >= timeout.tv_usec) {
timeout.tv_usec = target->tv_usec - timeout.tv_usec;
} else {
timeout.tv_sec--;
timeout.tv_usec =
1000000l + target->tv_usec - timeout.tv_usec;
}
} else {
timeout.tv_sec = 0;
timeout.tv_usec = 0;
}
auto ret = select(sock_ + 1, nullptr, &write_set, nullptr,
&timeout);
if (ret < 0 && errno == EINTR) continue;
if (ret <= 0) {
// Timeout or error
close(sock_);
sock_ = -1;
return send(channel, message);
}
break;
}
}
}
bool setup() {
size_t pos = sender_.find(':');
if (pos != std::string::npos) {
// host:port
struct addrinfo hints, *res;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (getaddrinfo(sender_.substr(0, pos).c_str(),
sender_.substr(pos + 1).c_str(), &hints, &res)) {
return false;
}
for (auto ptr = res; ptr; ptr = ptr->ai_next) {
sock_ = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (sock_ == -1) continue;
// TODO: Make async
if (connect(sock_, res->ai_addr, res->ai_addrlen)) {
close(sock_);
sock_ = -1;
continue;
}
break;
}
freeaddrinfo(res);
if (sock_ == -1) return false;
} else {
// socket
sock_ = socket(PF_LOCAL, SOCK_STREAM, 0);
if (sock_ == -1) return false;
struct sockaddr_un name;
name.sun_family = AF_LOCAL;
strncpy(name.sun_path, sender_.c_str(), sizeof(name.sun_path));
name.sun_path[sizeof(name.sun_path) - 1] = '\0';
// TODO: Make async
if (connect(sock_, reinterpret_cast<struct sockaddr*>(&name),
SUN_LEN(&name))) {
close(sock_);
sock_ = 1;
return false;
}
}
int flags = fcntl(sock_, F_GETFL, 0);
if (flags < 0) {
close(sock_);
sock_ = -1;
return false;
}
if (!(flags & O_NONBLOCK)) {
flags |= O_NONBLOCK;
if (fcntl(sock_, F_SETFL, flags) < 0) {
close(sock_);
sock_ = -1;
return false;
}
}
return true;
}
std::string sender_;
int sock_;
};
} // namespace
// static
std::unique_ptr<SenderClient> SenderClient::create(const Config* config) {
std::unique_ptr<SenderClientImpl> ret(new SenderClientImpl());
if (!ret->open(config)) return nullptr;
return std::move(ret);
}
} // namespace stuff
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