X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=server.cpp;h=d894bd14d0a85d05783366fb60f0394fcf7c86dc;hp=31e5c0a31da327bc80499c543bbb4dee932b74bb;hb=5812a7b5bb19068cff68c2946aa67a2a132717c7;hpb=97bdb597d4847308ce9d6982505b56a3a09e930b

diff --git a/server.cpp b/server.cpp
index 31e5c0a..d894bd1 100644
--- a/server.cpp
+++ b/server.cpp
@@ -13,6 +13,7 @@
 #include <vector>
 #include <string>
 #include <map>
+#include <algorithm>
 
 #include "metacube.h"
 #include "server.h"
@@ -47,9 +48,26 @@ void *Server::do_work_thunk(void *arg)
 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);
+
+		MutexLock lock(&mutex);  // We release the mutex between iterations.
+		if (nfds == -1) {
+			perror("epoll_wait");
+			exit(1);
+		}
+		
+		for (int i = 0; i < nfds; ++i) {
+			int fd = events[i].data.fd;
+			assert(clients.count(fd) != 0);
+			Client *client = &clients[fd];
+
+			if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
+				close_client(client);
+				continue;
+			}
+
+			process_client(client);
+		}
 	}
 }
 	
@@ -57,6 +75,8 @@ 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;
@@ -65,7 +85,7 @@ void Server::add_client(int sock)
 
 	// Start listening on data from this socket.
 	epoll_event ev;
-	ev.events = EPOLLIN;
+	ev.events = EPOLLIN | EPOLLRDHUP;
 	ev.data.fd = sock;
 	if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
 		perror("epoll_ctl(EPOLL_CTL_ADD)");
@@ -75,16 +95,231 @@ void Server::add_client(int sock)
 	
 void Server::add_stream(const string &stream_id)
 {
-	// TODO
+	MutexLock lock(&mutex);
+	streams.insert(make_pair(stream_id, Stream()));
 }
 	
 void Server::set_header(const string &stream_id, const string &header)
 {
-	// TODO
-	printf("got header! %lu bytes\n", header.size());
+	MutexLock lock(&mutex);
+	assert(streams.count(stream_id) != 0);
+	streams[stream_id].header = header;
 }
 	
 void Server::add_data(const string &stream_id, const char *data, size_t bytes)
 {
-	// TODO
+	if (bytes == 0) {
+		return;
+	}
+
+	MutexLock lock(&mutex);
+	assert(streams.count(stream_id) != 0);
+	Stream *stream = &streams[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)
+{
+	switch (client->state) {
+	case Client::READING_REQUEST: {
+		// Try to read more of the request.
+		char buf[1024];
+		int ret = read(client->sock, buf, sizeof(buf));
+		if (ret == -1) {
+			perror("read");
+			close_client(client);
+			return;
+		}
+		if (ret == 0) {
+			// No data? This really means that we were triggered for something else than
+			// POLLIN (which suggests a logic error in epoll).
+			fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
+			close_client(client);
+			return;
+		}
+
+		// Guard against overlong requests gobbling up all of our space.
+		if (client->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 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,
+			       "\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) {
+			fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
+			close_client(client);
+			return;
+		}
+
+		parse_request(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());
+
+		if (client->header_bytes_sent < client->header.size()) {
+			// We haven't sent all yet. Fine; we'll do that later.
+			return;
+		}
+
+		// 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 = streams[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 = streams[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 = streams[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";
+
+	// Construct the header.
+	client->header = "HTTP/1.0 200 OK\r\nContent-type: todo/fixme\r\n\r\n" +
+		streams[client->stream_id].header;
+
+	// Switch states.
+	client->state = Client::SENDING_HEADER;
+
+	epoll_event ev;
+	ev.events = EPOLLOUT | EPOLLRDHUP;
+	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)
+{
+	if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
+		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.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.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();
 }