#include <vector>
#include <string>
#include <map>
+#include <algorithm>
#include "metacube.h"
#include "server.h"
#include "mutexlock.h"
+#include "state.pb.h"
using namespace std;
+Client::Client(int sock)
+ : sock(sock),
+ state(Client::READING_REQUEST),
+ header_bytes_sent(0),
+ bytes_sent(0)
+{
+ request.reserve(1024);
+}
+
+Client::Client(const ClientProto &serialized)
+ : sock(serialized.sock()),
+ state(State(serialized.state())),
+ request(serialized.request()),
+ stream_id(serialized.stream_id()),
+ header(serialized.header()),
+ header_bytes_sent(serialized.header_bytes_sent()),
+ bytes_sent(serialized.bytes_sent())
+{
+}
+
+ClientProto Client::serialize() const
+{
+ ClientProto serialized;
+ serialized.set_sock(sock);
+ serialized.set_state(state);
+ serialized.set_request(request);
+ serialized.set_stream_id(stream_id);
+ serialized.set_header(header);
+ serialized.set_header_bytes_sent(serialized.header_bytes_sent());
+ serialized.set_bytes_sent(bytes_sent);
+ return serialized;
+}
+
+Stream::Stream(const string &stream_id)
+ : stream_id(stream_id),
+ data(new char[BACKLOG_SIZE]),
+ data_size(0)
+{
+ memset(data, 0, BACKLOG_SIZE);
+}
+
+Stream::~Stream()
+{
+ delete[] data;
+}
+
+Stream::Stream(const StreamProto &serialized)
+ : header(serialized.header()),
+ data(new char[BACKLOG_SIZE]),
+ data_size(serialized.data_size())
+{
+ assert(serialized.data().size() == BACKLOG_SIZE);
+ memcpy(data, serialized.data().data(), BACKLOG_SIZE);
+}
+
+StreamProto Stream::serialize() const
+{
+ StreamProto serialized;
+ serialized.set_header(header);
+ serialized.set_data(string(data, data + BACKLOG_SIZE));
+ serialized.set_data_size(data_size);
+ return serialized;
+}
+
Server::Server()
{
pthread_mutex_init(&mutex, NULL);
void Server::run()
{
- pthread_t thread;
- pthread_create(&thread, NULL, Server::do_work_thunk, this);
+ should_stop = false;
+
+ // Joinable is already the default, but it's good to be certain.
+ pthread_attr_t attr;
+ pthread_attr_init(&attr);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
+ pthread_create(&worker_thread, &attr, Server::do_work_thunk, this);
+}
+
+void Server::stop()
+{
+ {
+ MutexLock lock(&mutex);
+ should_stop = true;
+ }
+
+ if (pthread_join(worker_thread, NULL) == -1) {
+ perror("pthread_join");
+ exit(1);
+ }
}
void *Server::do_work_thunk(void *arg)
{
for ( ;; ) {
int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
-
- MutexLock lock(&mutex); // We release the mutex between iterations.
if (nfds == -1) {
perror("epoll_wait");
exit(1);
}
-
+
+ MutexLock lock(&mutex); // We release the mutex between iterations.
+
+ if (should_stop) {
+ return;
+ }
+
for (int i = 0; i < nfds; ++i) {
int fd = events[i].data.fd;
assert(clients.count(fd) != 0);
}
}
}
-
+
+CubemapStateProto Server::serialize() const
+{
+ CubemapStateProto serialized;
+ for (map<int, Client>::const_iterator client_it = clients.begin();
+ client_it != clients.end();
+ ++client_it) {
+ serialized.add_clients()->MergeFrom(client_it->second.serialize());
+ }
+ for (map<string, Stream *>::const_iterator stream_it = streams.begin();
+ stream_it != streams.end();
+ ++stream_it) {
+ serialized.add_streams()->MergeFrom(stream_it->second->serialize());
+ }
+ return serialized;
+}
+
void Server::add_client(int sock)
{
MutexLock lock(&mutex);
- Client new_client;
- new_client.sock = sock;
- new_client.client_request.reserve(1024);
- new_client.state = Client::READING_REQUEST;
- new_client.header_bytes_sent = 0;
- new_client.bytes_sent = 0;
-
- clients.insert(make_pair(sock, new_client));
+ clients.insert(make_pair(sock, Client(sock)));
// Start listening on data from this socket.
epoll_event ev;
ev.events = EPOLLIN | EPOLLRDHUP;
+ ev.data.u64 = 0; // Keep Valgrind happy.
ev.data.fd = sock;
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
perror("epoll_ctl(EPOLL_CTL_ADD)");
void Server::add_stream(const string &stream_id)
{
- // TODO
+ MutexLock lock(&mutex);
+ streams.insert(make_pair(stream_id, new Stream(stream_id)));
}
void Server::set_header(const string &stream_id, const string &header)
{
- // TODO
- printf("got header! %lu bytes\n", header.size());
+ MutexLock lock(&mutex);
+ find_stream(stream_id)->header = header;
+
+ // If there are clients we haven't sent anything to yet, we should give
+ // them the header, so push back into the SENDING_HEADER state.
+ for (map<int, Client>::iterator client_it = clients.begin();
+ client_it != clients.end();
+ ++client_it) {
+ Client *client = &client_it->second;
+ if (client->state == Client::SENDING_DATA &&
+ client->bytes_sent == 0) {
+ construct_header(client);
+ }
+ }
}
void Server::add_data(const string &stream_id, const char *data, size_t bytes)
{
- // TODO
+ if (bytes == 0) {
+ return;
+ }
+
+ MutexLock lock(&mutex);
+ Stream *stream = find_stream(stream_id);
+ size_t pos = stream->data_size % BACKLOG_SIZE;
+ stream->data_size += bytes;
+
+ if (pos + bytes > BACKLOG_SIZE) {
+ size_t to_copy = BACKLOG_SIZE - pos;
+ memcpy(stream->data + pos, data, to_copy);
+ data += to_copy;
+ bytes -= to_copy;
+ pos = 0;
+ }
+
+ memcpy(stream->data + pos, data, bytes);
+ wake_up_all_clients();
}
void Server::process_client(Client *client)
}
// Guard against overlong requests gobbling up all of our space.
- if (client->client_request.size() + ret > MAX_CLIENT_REQUEST) {
+ if (client->request.size() + ret > MAX_CLIENT_REQUEST) {
fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
close_client(client);
return;
// See if we have \r\n\r\n anywhere in the request. We start three bytes
// before what we just appended, in case we just got the final character.
- size_t existing_req_bytes = client->client_request.size();
- client->client_request.append(string(buf, buf + ret));
+ size_t existing_req_bytes = client->request.size();
+ client->request.append(string(buf, buf + ret));
size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
const char *ptr = reinterpret_cast<char *>(
- memmem(client->client_request.data() + start_at, client->client_request.size() - start_at,
+ memmem(client->request.data() + start_at, client->request.size() - start_at,
"\r\n\r\n", 4));
if (ptr == NULL) {
// OK, we don't have the entire header yet. Fine; we'll get it later.
return;
}
- if (ptr != client->client_request.data() + client->client_request.size() - 4) {
+ if (ptr != client->request.data() + client->request.size() - 4) {
fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
close_client(client);
return;
}
- client->state = Client::SENDING_HEADER;
+ parse_request(client);
+ construct_header(client);
+ break;
+ }
+ case Client::SENDING_HEADER: {
+ int ret = write(client->sock,
+ client->header.data() + client->header_bytes_sent,
+ client->header.size() - client->header_bytes_sent);
+ if (ret == -1) {
+ perror("write");
+ close_client(client);
+ return;
+ }
+
+ client->header_bytes_sent += ret;
+ assert(client->header_bytes_sent <= client->header.size());
- epoll_event ev;
- ev.events = EPOLLOUT | EPOLLRDHUP;
- ev.data.fd = client->sock;
+ if (client->header_bytes_sent < client->header.size()) {
+ // We haven't sent all yet. Fine; we'll do that later.
+ return;
+ }
- if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
- perror("epoll_ctl(EPOLL_CTL_MOD)");
- exit(1);
+ // We're done sending the header! Clear the entire header to release some memory.
+ client->header.clear();
+
+ // Start sending from the end. In other words, we won't send any of the backlog,
+ // but we'll start sending immediately as we get data.
+ client->state = Client::SENDING_DATA;
+ client->bytes_sent = find_stream(client->stream_id)->data_size;
+ break;
+ }
+ case Client::SENDING_DATA: {
+ // See if there's some data we've lost. Ideally, we should drop to a block boundary,
+ // but resync will be the mux's problem.
+ const Stream &stream = *find_stream(client->stream_id);
+ size_t bytes_to_send = stream.data_size - client->bytes_sent;
+ if (bytes_to_send > BACKLOG_SIZE) {
+ fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
+ client->sock,
+ (long long int)(bytes_to_send - BACKLOG_SIZE));
+ client->bytes_sent = find_stream(client->stream_id)->data_size - BACKLOG_SIZE;
+ bytes_to_send = BACKLOG_SIZE;
+ }
+
+ // See if we need to split across the circular buffer.
+ ssize_t ret;
+ if ((client->bytes_sent % BACKLOG_SIZE) + bytes_to_send > BACKLOG_SIZE) {
+ size_t bytes_first_part = BACKLOG_SIZE - (client->bytes_sent % BACKLOG_SIZE);
+
+ iovec iov[2];
+ iov[0].iov_base = const_cast<char *>(stream.data + (client->bytes_sent % BACKLOG_SIZE));
+ iov[0].iov_len = bytes_first_part;
+
+ iov[1].iov_base = const_cast<char *>(stream.data);
+ iov[1].iov_len = bytes_to_send - bytes_first_part;
+
+ ret = writev(client->sock, iov, 2);
+ } else {
+ ret = write(client->sock,
+ stream.data + (client->bytes_sent % BACKLOG_SIZE),
+ bytes_to_send);
+ }
+ if (ret == -1) {
+ perror("write/writev");
+ close_client(client);
+ return;
+ }
+ client->bytes_sent += ret;
+
+ if (client->bytes_sent == stream.data_size) {
+ // We don't have any more data for this client, so put it to sleep.
+ put_client_to_sleep(client);
}
break;
}
default:
- // TODO
assert(false);
}
}
+
+void Server::parse_request(Client *client)
+{
+ // TODO: Actually parse the request. :-)
+ client->stream_id = "stream";
+ client->request.clear();
+}
+
+void Server::construct_header(Client *client)
+{
+ client->header = "HTTP/1.0 200 OK\r\nContent-type: video/x-flv\r\nCache-Control: no-cache\r\n\r\n" +
+ find_stream(client->stream_id)->header;
+
+ // Switch states.
+ client->state = Client::SENDING_HEADER;
+
+ epoll_event ev;
+ ev.events = EPOLLOUT | EPOLLRDHUP;
+ ev.data.u64 = 0; // Keep Valgrind happy.
+ ev.data.fd = client->sock;
+
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
+ perror("epoll_ctl(EPOLL_CTL_MOD)");
+ exit(1);
+ }
+}
void Server::close_client(Client *client)
{
perror("epoll_ctl(EPOLL_CTL_DEL)");
exit(1);
}
+
+ // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
+ vector<int>::iterator new_end =
+ remove(sleeping_clients.begin(), sleeping_clients.end(), client->sock);
+ sleeping_clients.erase(new_end, sleeping_clients.end());
// Bye-bye!
close(client->sock);
clients.erase(client->sock);
}
+
+void Server::put_client_to_sleep(Client *client)
+{
+ epoll_event ev;
+ ev.events = EPOLLRDHUP;
+ ev.data.u64 = 0; // Keep Valgrind happy.
+ ev.data.fd = client->sock;
+
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
+ perror("epoll_ctl(EPOLL_CTL_MOD)");
+ exit(1);
+ }
+
+ sleeping_clients.push_back(client->sock);
+}
+
+void Server::wake_up_all_clients()
+{
+ for (unsigned i = 0; i < sleeping_clients.size(); ++i) {
+ epoll_event ev;
+ ev.events = EPOLLOUT | EPOLLRDHUP;
+ ev.data.u64 = 0; // Keep Valgrind happy.
+ ev.data.fd = sleeping_clients[i];
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, sleeping_clients[i], &ev) == -1) {
+ perror("epoll_ctl(EPOLL_CTL_MOD)");
+ exit(1);
+ }
+ }
+ sleeping_clients.clear();
+}
+
+Stream *Server::find_stream(const string &stream_id)
+{
+ map<string, Stream *>::iterator it = streams.find(stream_id);
+ assert(it != streams.end());
+ return it->second;
+}
projects / cubemap / blobdiff