+#include <assert.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <stdint.h>
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
-#include <stdint.h>
-#include <assert.h>
-#include <arpa/inet.h>
-#include <curl/curl.h>
+#include <sys/epoll.h>
+#include <sys/sendfile.h>
#include <sys/socket.h>
-#include <pthread.h>
#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <sys/epoll.h>
-#include <errno.h>
-#include <vector>
-#include <string>
+#include <unistd.h>
+#include <algorithm>
#include <map>
+#include <string>
+#include <utility>
+#include <vector>
+#include "accesslog.h"
+#include "log.h"
+#include "markpool.h"
#include "metacube.h"
-#include "server.h"
#include "mutexlock.h"
+#include "parse.h"
+#include "server.h"
+#include "state.pb.h"
+#include "stream.h"
using namespace std;
+extern AccessLogThread *access_log;
+
Server::Server()
{
pthread_mutex_init(&mutex, NULL);
+ pthread_mutex_init(&queued_data_mutex, NULL);
epoll_fd = epoll_create(1024); // Size argument is ignored.
if (epoll_fd == -1) {
- perror("epoll_fd");
+ log_perror("epoll_fd");
exit(1);
}
}
-void Server::run()
+Server::~Server()
{
- pthread_t thread;
- pthread_create(&thread, NULL, Server::do_work_thunk, this);
+ for (map<string, Stream *>::iterator stream_it = streams.begin();
+ stream_it != streams.end();
+ ++stream_it) {
+ delete stream_it->second;
+ }
+
+ int ret;
+ do {
+ ret = close(epoll_fd);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1) {
+ log_perror("close(epoll_fd)");
+ }
}
-void *Server::do_work_thunk(void *arg)
+vector<ClientStats> Server::get_client_stats() const
{
- Server *server = static_cast<Server *>(arg);
- server->do_work();
- return NULL;
+ vector<ClientStats> ret;
+
+ MutexLock lock(&mutex);
+ for (map<int, Client>::const_iterator client_it = clients.begin();
+ client_it != clients.end();
+ ++client_it) {
+ ret.push_back(client_it->second.get_stats());
+ }
+ return ret;
}
void Server::do_work()
{
for ( ;; ) {
- MutexLock lock(&mutex);
- printf("server thread running\n");
- sleep(1);
+ int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
+ if (nfds == -1 && errno == EINTR) {
+ if (should_stop) {
+ return;
+ }
+ continue;
+ }
+ if (nfds == -1) {
+ log_perror("epoll_wait");
+ exit(1);
+ }
+
+ MutexLock lock(&mutex); // We release the mutex between iterations.
+
+ process_queued_data();
+
+ for (int i = 0; i < nfds; ++i) {
+ Client *client = reinterpret_cast<Client *>(events[i].data.u64);
+
+ if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
+ close_client(client);
+ continue;
+ }
+
+ process_client(client);
+ }
+
+ for (map<string, Stream *>::iterator stream_it = streams.begin();
+ stream_it != streams.end();
+ ++stream_it) {
+ vector<Client *> to_process;
+ swap(stream_it->second->to_process, to_process);
+ for (size_t i = 0; i < to_process.size(); ++i) {
+ process_client(to_process[i]);
+ }
+ }
+
+ if (should_stop) {
+ return;
+ }
}
}
-
-void Server::add_client(int sock)
+
+CubemapStateProto Server::serialize()
{
- MutexLock lock(&mutex);
- Client new_client;
- new_client.state = Client::READING_REQUEST;
- new_client.header_bytes_sent = 0;
- new_client.bytes_sent = 0;
+ // We don't serialize anything queued, so empty the queues.
+ process_queued_data();
- clients.insert(make_pair(sock, new_client));
+ 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_deferred(int sock)
+{
+ MutexLock lock(&queued_data_mutex);
+ queued_add_clients.push_back(sock);
+}
+
+void Server::add_client(int sock)
+{
+ pair<map<int, Client>::iterator, bool> ret =
+ clients.insert(make_pair(sock, Client(sock)));
+ assert(ret.second == true); // Should not already exist.
+ Client *client_ptr = &ret.first->second;
// Start listening on data from this socket.
epoll_event ev;
- ev.events = EPOLLIN;
- ev.data.fd = sock;
+ ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
+ ev.data.u64 = reinterpret_cast<uint64_t>(client_ptr);
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
- perror("epoll_ctl(EPOLL_CTL_ADD)");
+ log_perror("epoll_ctl(EPOLL_CTL_ADD)");
+ exit(1);
+ }
+
+ process_client(client_ptr);
+}
+
+void Server::add_client_from_serialized(const ClientProto &client)
+{
+ MutexLock lock(&mutex);
+ Stream *stream;
+ map<string, Stream *>::iterator stream_it = streams.find(client.stream_id());
+ if (stream_it == streams.end()) {
+ stream = NULL;
+ } else {
+ stream = stream_it->second;
+ }
+ pair<map<int, Client>::iterator, bool> ret =
+ clients.insert(make_pair(client.sock(), Client(client, stream)));
+ assert(ret.second == true); // Should not already exist.
+ Client *client_ptr = &ret.first->second;
+
+ // Start listening on data from this socket.
+ epoll_event ev;
+ if (client.state() == Client::READING_REQUEST) {
+ ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
+ } else {
+ // If we don't have more data for this client, we'll be putting it into
+ // the sleeping array again soon.
+ ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
+ }
+ ev.data.u64 = 0; // Keep Valgrind happy.
+ ev.data.u64 = reinterpret_cast<uint64_t>(client_ptr);
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
+ log_perror("epoll_ctl(EPOLL_CTL_ADD)");
+ exit(1);
+ }
+
+ if (client_ptr->state == Client::SENDING_DATA &&
+ client_ptr->stream_pos == client_ptr->stream->bytes_received) {
+ client_ptr->stream->put_client_to_sleep(client_ptr);
+ } else {
+ process_client(client_ptr);
+ }
+}
+
+void Server::add_stream(const string &stream_id, size_t backlog_size, Stream::Encoding encoding)
+{
+ MutexLock lock(&mutex);
+ streams.insert(make_pair(stream_id, new Stream(stream_id, backlog_size, encoding)));
+}
+
+void Server::add_stream_from_serialized(const StreamProto &stream, int data_fd)
+{
+ MutexLock lock(&mutex);
+ streams.insert(make_pair(stream.stream_id(), new Stream(stream, data_fd)));
+}
+
+void Server::set_backlog_size(const string &stream_id, size_t new_size)
+{
+ MutexLock lock(&mutex);
+ assert(streams.count(stream_id) != 0);
+ streams[stream_id]->set_backlog_size(new_size);
+}
+
+void Server::set_encoding(const string &stream_id, Stream::Encoding encoding)
+{
+ MutexLock lock(&mutex);
+ assert(streams.count(stream_id) != 0);
+ streams[stream_id]->encoding = encoding;
+}
+
+void Server::set_header(const string &stream_id, const string &http_header, const string &stream_header)
+{
+ MutexLock lock(&mutex);
+ find_stream(stream_id)->http_header = http_header;
+ find_stream(stream_id)->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::SENDING_DATA &&
+ client->stream_pos == 0) {
+ construct_header(client);
+ }
+ }
+}
+
+void Server::set_mark_pool(const string &stream_id, MarkPool *mark_pool)
+{
+ MutexLock lock(&mutex);
+ assert(clients.empty());
+ find_stream(stream_id)->mark_pool = mark_pool;
+}
+
+void Server::add_data_deferred(const string &stream_id, const char *data, size_t bytes)
+{
+ MutexLock lock(&queued_data_mutex);
+ queued_data[stream_id].append(string(data, data + bytes));
+}
+
+// See the .h file for postconditions after this function.
+void Server::process_client(Client *client)
+{
+ switch (client->state) {
+ case Client::READING_REQUEST: {
+read_request_again:
+ // Try to read more of the request.
+ char buf[1024];
+ int ret;
+ do {
+ ret = read(client->sock, buf, sizeof(buf));
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1 && errno == EAGAIN) {
+ // No more data right now. Nothing to do.
+ // This is postcondition #2.
+ return;
+ }
+ if (ret == -1) {
+ log_perror("read");
+ close_client(client);
+ return;
+ }
+ if (ret == 0) {
+ // OK, the socket is closed.
+ close_client(client);
+ return;
+ }
+
+ RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
+
+ switch (status) {
+ case RP_OUT_OF_SPACE:
+ log(WARNING, "[%s] Client sent overlong request!", client->remote_addr.c_str());
+ close_client(client);
+ return;
+ case RP_NOT_FINISHED_YET:
+ // OK, we don't have the entire header yet. Fine; we'll get it later.
+ // See if there's more data for us.
+ goto read_request_again;
+ case RP_EXTRA_DATA:
+ log(WARNING, "[%s] Junk data after request!", client->remote_addr.c_str());
+ close_client(client);
+ return;
+ case RP_FINISHED:
+ break;
+ }
+
+ assert(status == RP_FINISHED);
+
+ int error_code = parse_request(client);
+ if (error_code == 200) {
+ construct_header(client);
+ } else {
+ construct_error(client, error_code);
+ }
+
+ // We've changed states, so fall through.
+ assert(client->state == Client::SENDING_ERROR ||
+ client->state == Client::SENDING_HEADER);
+ }
+ case Client::SENDING_ERROR:
+ case Client::SENDING_HEADER: {
+sending_header_or_error_again:
+ int ret;
+ do {
+ ret = write(client->sock,
+ client->header_or_error.data() + client->header_or_error_bytes_sent,
+ client->header_or_error.size() - client->header_or_error_bytes_sent);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1 && errno == EAGAIN) {
+ // We're out of socket space, so now we're at the “low edge” of epoll's
+ // edge triggering. epoll will tell us when there is more room, so for now,
+ // just return.
+ // This is postcondition #4.
+ return;
+ }
+
+ if (ret == -1) {
+ // Error! Postcondition #1.
+ log_perror("write");
+ close_client(client);
+ return;
+ }
+
+ client->header_or_error_bytes_sent += ret;
+ assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
+
+ if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
+ // We haven't sent all yet. Fine; go another round.
+ goto sending_header_or_error_again;
+ }
+
+ // We're done sending the header or error! Clear it to release some memory.
+ client->header_or_error.clear();
+
+ if (client->state == Client::SENDING_ERROR) {
+ // We're done sending the error, so now close.
+ // This is postcondition #1.
+ close_client(client);
+ return;
+ }
+
+ // 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.
+ // This is postcondition #3.
+ client->state = Client::SENDING_DATA;
+ client->stream_pos = client->stream->bytes_received;
+ client->stream->put_client_to_sleep(client);
+ return;
+ }
+ case Client::SENDING_DATA: {
+sending_data_again:
+ // 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.
+ Stream *stream = client->stream;
+ size_t bytes_to_send = stream->bytes_received - client->stream_pos;
+ if (bytes_to_send == 0) {
+ return;
+ }
+ if (bytes_to_send > stream->backlog_size) {
+ size_t bytes_lost = bytes_to_send - stream->backlog_size;
+ client->stream_pos = stream->bytes_received - stream->backlog_size;
+ client->bytes_lost += bytes_lost;
+ ++client->num_loss_events;
+ bytes_to_send = stream->backlog_size;
+
+ 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);
+ }
+
+ // See if we need to split across the circular buffer.
+ bool more_data = false;
+ if ((client->stream_pos % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
+ bytes_to_send = stream->backlog_size - (client->stream_pos % stream->backlog_size);
+ more_data = true;
+ }
+
+ ssize_t ret;
+ do {
+ loff_t offset = client->stream_pos % stream->backlog_size;
+ ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1 && errno == EAGAIN) {
+ // We're out of socket space, so return; epoll will wake us up
+ // when there is more room.
+ // This is postcondition #4.
+ return;
+ }
+ if (ret == -1) {
+ // Error, close; postcondition #1.
+ log_perror("sendfile");
+ close_client(client);
+ return;
+ }
+ client->stream_pos += ret;
+ client->bytes_sent += ret;
+
+ if (client->stream_pos == stream->bytes_received) {
+ // We don't have any more data for this client, so put it to sleep.
+ // This is postcondition #3.
+ stream->put_client_to_sleep(client);
+ } else if (more_data && size_t(ret) == bytes_to_send) {
+ goto sending_data_again;
+ }
+ break;
+ }
+ default:
+ assert(false);
+ }
+}
+
+int Server::parse_request(Client *client)
+{
+ vector<string> lines = split_lines(client->request);
+ if (lines.empty()) {
+ return 400; // Bad request (empty).
+ }
+
+ vector<string> request_tokens = split_tokens(lines[0]);
+ if (request_tokens.size() < 2) {
+ return 400; // Bad request (empty).
+ }
+ if (request_tokens[0] != "GET") {
+ return 400; // Should maybe be 405 instead?
+ }
+ if (streams.count(request_tokens[1]) == 0) {
+ return 404; // Not found.
+ }
+
+ client->stream_id = request_tokens[1];
+ client->stream = find_stream(client->stream_id);
+ 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)");
+ }
+ }
+ client->request.clear();
+
+ return 200; // OK!
+}
+
+void Server::construct_header(Client *client)
+{
+ Stream *stream = find_stream(client->stream_id);
+ if (stream->encoding == Stream::STREAM_ENCODING_RAW) {
+ client->header_or_error = stream->http_header +
+ "\r\n" +
+ stream->stream_header;
+ } else if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
+ client->header_or_error = stream->http_header +
+ "Content-encoding: metacube\r\n" +
+ "\r\n";
+ if (!stream->stream_header.empty()) {
+ metacube_block_header hdr;
+ memcpy(hdr.sync, METACUBE_SYNC, sizeof(hdr.sync));
+ hdr.size = htonl(stream->stream_header.size());
+ hdr.flags = htonl(METACUBE_FLAGS_HEADER);
+ client->header_or_error.append(
+ string(reinterpret_cast<char *>(&hdr), sizeof(hdr)));
+ }
+ client->header_or_error.append(stream->stream_header);
+ } else {
+ assert(false);
+ }
+
+ // Switch states.
+ client->state = Client::SENDING_HEADER;
+
+ epoll_event ev;
+ ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
+ ev.data.u64 = reinterpret_cast<uint64_t>(client);
+
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
+ log_perror("epoll_ctl(EPOLL_CTL_MOD)");
exit(1);
}
}
-void Server::add_stream(const string &stream_id)
+void Server::construct_error(Client *client, int error_code)
{
- // TODO
+ char error[256];
+ snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
+ error_code);
+ client->header_or_error = error;
+
+ // Switch states.
+ client->state = Client::SENDING_ERROR;
+
+ epoll_event ev;
+ ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
+ ev.data.u64 = reinterpret_cast<uint64_t>(client);
+
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
+ log_perror("epoll_ctl(EPOLL_CTL_MOD)");
+ exit(1);
+ }
+}
+
+template<class T>
+void delete_from(vector<T> *v, T elem)
+{
+ typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
+ v->erase(new_end, v->end());
}
-void Server::set_header(const string &stream_id, const string &header)
+void Server::close_client(Client *client)
{
- // TODO
- printf("got header! %lu bytes\n", header.size());
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
+ log_perror("epoll_ctl(EPOLL_CTL_DEL)");
+ exit(1);
+ }
+
+ // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
+ 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.
+ access_log->write(client->get_stats());
+
+ // Bye-bye!
+ int ret;
+ do {
+ ret = close(client->sock);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1) {
+ log_perror("close");
+ }
+
+ clients.erase(client->sock);
}
-void Server::add_data(const string &stream_id, const char *data, size_t bytes)
+Stream *Server::find_stream(const string &stream_id)
+{
+ map<string, Stream *>::iterator it = streams.find(stream_id);
+ assert(it != streams.end());
+ return it->second;
+}
+
+void Server::process_queued_data()
{
- // TODO
+ MutexLock lock(&queued_data_mutex);
+
+ for (size_t i = 0; i < queued_add_clients.size(); ++i) {
+ add_client(queued_add_clients[i]);
+ }
+ queued_add_clients.clear();
+
+ for (map<string, string>::iterator queued_it = queued_data.begin();
+ queued_it != queued_data.end();
+ ++queued_it) {
+ Stream *stream = find_stream(queued_it->first);
+ stream->add_data(queued_it->second.data(), queued_it->second.size());
+ stream->wake_up_all_clients();
+ }
+ queued_data.clear();
}
projects / cubemap / blobdiff