#include "accesslog.h"
#include "log.h"
-#include "markpool.h"
#include "metacube2.h"
#include "mutexlock.h"
#include "parse.h"
extern AccessLogThread *access_log;
+namespace {
+
+inline bool is_equal(timespec a, timespec b)
+{
+ return a.tv_sec == b.tv_sec &&
+ a.tv_nsec == b.tv_nsec;
+}
+
+inline bool is_earlier(timespec a, timespec b)
+{
+ if (a.tv_sec != b.tv_sec)
+ return a.tv_sec < b.tv_sec;
+ return a.tv_nsec < b.tv_nsec;
+}
+
+} // namespace
+
Server::Server()
{
pthread_mutex_init(&mutex, NULL);
process_queued_data();
+ // Process each client where we have socket activity.
for (int i = 0; i < nfds; ++i) {
Client *client = reinterpret_cast<Client *>(events[i].data.u64);
process_client(client);
}
+ // Process each client where its stream has new data,
+ // even if there was no socket activity.
for (size_t i = 0; i < streams.size(); ++i) {
vector<Client *> to_process;
swap(streams[i]->to_process, to_process);
process_client(to_process[i]);
}
}
+
+ // Finally, go through each client to see if it's timed out
+ // in the READING_REQUEST state. (Seemingly there are clients
+ // that can hold sockets up for days at a time without sending
+ // anything at all.)
+ timespec timeout_time;
+ if (clock_gettime(CLOCK_MONOTONIC_COARSE, &timeout_time) == -1) {
+ log_perror("clock_gettime(CLOCK_MONOTONIC_COARSE)");
+ continue;
+ }
+ timeout_time.tv_sec -= REQUEST_READ_TIMEOUT_SEC;
+ while (!clients_ordered_by_connect_time.empty()) {
+ pair<timespec, int> &connect_time_and_fd = clients_ordered_by_connect_time.front();
+
+ // See if we have reached the end of clients to process.
+ if (is_earlier(timeout_time, connect_time_and_fd.first)) {
+ break;
+ }
+
+ // If this client doesn't exist anymore, just ignore it
+ // (it was deleted earlier).
+ std::map<int, Client>::iterator client_it = clients.find(connect_time_and_fd.second);
+ if (client_it == clients.end()) {
+ clients_ordered_by_connect_time.pop();
+ continue;
+ }
+ Client *client = &client_it->second;
+ if (!is_equal(client->connect_time, connect_time_and_fd.first)) {
+ // Another client has taken this fd in the meantime.
+ clients_ordered_by_connect_time.pop();
+ continue;
+ }
+
+ if (client->state != Client::READING_REQUEST) {
+ // Only READING_REQUEST can time out.
+ clients_ordered_by_connect_time.pop();
+ continue;
+ }
+
+ // OK, it timed out.
+ close_client(client);
+ clients_ordered_by_connect_time.pop();
+ }
}
}
assert(ret.second == true); // Should not already exist.
Client *client_ptr = &ret.first->second;
+ // Connection timestamps must be nondecreasing. I can't find any guarantee
+ // that even the monotonic clock can't go backwards by a small amount
+ // (think switching between CPUs with non-synchronized TSCs), so if
+ // this actually should happen, we hack around it by fudging
+ // connect_time.
+ if (!clients_ordered_by_connect_time.empty() &&
+ is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first)) {
+ client_ptr->connect_time = clients_ordered_by_connect_time.back().first;
+ }
+ clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, sock));
+
// Start listening on data from this socket.
epoll_event ev;
ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
assert(ret.second == true); // Should not already exist.
Client *client_ptr = &ret.first->second;
+ // Connection timestamps must be nondecreasing.
+ assert(clients_ordered_by_connect_time.empty() ||
+ !is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first));
+ clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, client.sock()));
+
// Start listening on data from this socket.
epoll_event ev;
if (client.state() == Client::READING_REQUEST) {
}
if (client_ptr->state == Client::WAITING_FOR_KEYFRAME ||
+ client_ptr->state == Client::PREBUFFERING ||
(client_ptr->state == Client::SENDING_DATA &&
client_ptr->stream_pos == client_ptr->stream->bytes_received)) {
client_ptr->stream->put_client_to_sleep(client_ptr);
return url_it->second;
}
-int Server::add_stream(const string &url, size_t backlog_size, Stream::Encoding encoding)
+int Server::add_stream(const string &url, size_t backlog_size, size_t prebuffering_bytes, Stream::Encoding encoding)
{
MutexLock lock(&mutex);
url_map.insert(make_pair(url, streams.size()));
- streams.push_back(new Stream(url, backlog_size, encoding));
+ streams.push_back(new Stream(url, backlog_size, prebuffering_bytes, encoding));
return streams.size() - 1;
}
assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
streams[stream_index]->http_header = http_header;
streams[stream_index]->stream_header = stream_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::WAITING_FOR_KEYFRAME ||
- (client->state == Client::SENDING_DATA &&
- client->stream_pos == 0)) {
- construct_header(client);
- }
- }
}
-void Server::set_mark_pool(int stream_index, MarkPool *mark_pool)
-{
- MutexLock lock(&mutex);
- assert(clients.empty());
- assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
- streams[stream_index]->mark_pool = mark_pool;
-}
-
void Server::set_pacing_rate(int stream_index, uint32_t pacing_rate)
{
MutexLock lock(&mutex);
return;
}
client->stream_pos = stream->last_suitable_starting_point;
+ client->state = Client::PREBUFFERING;
+ // Fall through.
+ }
+ case Client::PREBUFFERING: {
+ Stream *stream = client->stream;
+ size_t bytes_to_send = stream->bytes_received - client->stream_pos;
+ assert(bytes_to_send <= stream->backlog_size);
+ if (bytes_to_send < stream->prebuffering_bytes) {
+ // We don't have enough bytes buffered to start this client yet.
+ stream->put_client_to_sleep(client);
+ return;
+ }
client->state = Client::SENDING_DATA;
// Fall through.
}
client->stream_pos = stream->bytes_received - stream->backlog_size;
client->bytes_lost += bytes_lost;
++client->num_loss_events;
-
- double loss_fraction = double(client->bytes_lost) / double(client->bytes_lost + client->bytes_sent);
- log(WARNING, "[%s] Client lost %lld bytes (total loss: %.2f%%), maybe too slow connection",
- client->remote_addr.c_str(),
- (long long int)(bytes_lost),
- 100.0 * loss_fraction);
}
}
return 404; // Not found.
}
- client->url = request_tokens[1];
- client->stream = streams[url_map_it->second];
- if (client->stream->mark_pool != NULL) {
- client->fwmark = client->stream->mark_pool->get_mark();
- } else {
- client->fwmark = 0; // No mark.
- }
- if (setsockopt(client->sock, SOL_SOCKET, SO_MARK, &client->fwmark, sizeof(client->fwmark)) == -1) {
- if (client->fwmark != 0) {
- log_perror("setsockopt(SO_MARK)");
- }
+ Stream *stream = streams[url_map_it->second];
+ if (stream->http_header.empty()) {
+ return 503; // Service unavailable.
}
+
+ client->url = request_tokens[1];
+ client->stream = stream;
if (setsockopt(client->sock, SOL_SOCKET, SO_MAX_PACING_RATE, &client->stream->pacing_rate, sizeof(client->stream->pacing_rate)) == -1) {
if (client->stream->pacing_rate != ~0U) {
log_perror("setsockopt(SO_MAX_PACING_RATE)");
if (client->stream != NULL) {
delete_from(&client->stream->sleeping_clients, client);
delete_from(&client->stream->to_process, client);
- if (client->stream->mark_pool != NULL) {
- int fwmark = client->fwmark;
- client->stream->mark_pool->release_mark(fwmark);
- }
}
// Log to access_log.
projects / cubemap / blobdiff