Reset the list of suitable starting points when changing header.

[cubemap] / server.cpp

diff --git a/server.cpp b/server.cpp
index 01ed0ff041697ce1894c16652b374c66881e92f3..8a8e867be1bf64f3cf47fc3a2c14e2dca37b9b4b 100644 (file)
--- a/server.cpp
+++ b/server.cpp
@@ -217,9 +217,15 @@ void Server::add_client(int sock)
        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));
+       // 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.
@@ -311,6 +317,13 @@ void Server::set_backlog_size(int stream_index, size_t new_size)
        assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
        streams[stream_index]->set_backlog_size(new_size);
 }
+
+void Server::set_prebuffering_bytes(int stream_index, size_t new_amount)
+{
+       MutexLock lock(&mutex);
+       assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+       streams[stream_index]->prebuffering_bytes = new_amount;
+}
        
 void Server::set_encoding(int stream_index, Stream::Encoding encoding)
 {
@@ -324,6 +337,17 @@ void Server::set_header(int stream_index, const string &http_header, const strin
        MutexLock lock(&mutex);
        assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
        streams[stream_index]->http_header = http_header;
+
+       if (stream_header != streams[stream_index]->stream_header) {
+               // We cannot start at any of the older starting points anymore,
+               // since they'd get the wrong header for the stream (not to mention
+               // that a changed header probably means the stream restarted,
+               // which means any client starting on the old one would probably
+               // stop playing properly at the change point). Next block
+               // should be a suitable starting point (if not, something is
+               // pretty strange), so it will fill up again soon enough.
+               streams[stream_index]->suitable_starting_points.clear();
+       }
        streams[stream_index]->stream_header = stream_header;
 }
        
@@ -465,14 +489,15 @@ sending_header_or_error_again:
        }
        case Client::WAITING_FOR_KEYFRAME: {
                Stream *stream = client->stream;
-               if (ssize_t(client->stream_pos) > stream->last_suitable_starting_point) {
+               if (stream->suitable_starting_points.empty() ||
+                   client->stream_pos > stream->suitable_starting_points.back()) {
                        // We haven't received a keyframe since this stream started waiting,
                        // so keep on waiting for one.
                        // This is postcondition #3.
                        stream->put_client_to_sleep(client);
                        return;
                }
-               client->stream_pos = stream->last_suitable_starting_point;
+               client->stream_pos = stream->suitable_starting_points.back();
                client->state = Client::PREBUFFERING;
                // Fall through.
        }
@@ -482,6 +507,7 @@ sending_header_or_error_again:
                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.
+                       // This is postcondition #3.
                        stream->put_client_to_sleep(client);
                        return;
                }
@@ -565,6 +591,18 @@ int Server::parse_request(Client *client)
                return 400;  // Bad request (empty).
        }
 
+       // Parse the headers, for logging purposes.
+       // TODO: Case-insensitivity.
+       multimap<string, string> headers = extract_headers(lines, client->remote_addr);
+       multimap<string, string>::const_iterator referer_it = headers.find("Referer");
+       if (referer_it != headers.end()) {
+               client->referer = referer_it->second;
+       }
+       multimap<string, string>::const_iterator user_agent_it = headers.find("User-Agent");
+       if (user_agent_it != headers.end()) {
+               client->user_agent = user_agent_it->second;
+       }
+
        vector<string> request_tokens = split_tokens(lines[0]);
        if (request_tokens.size() < 2) {
                return 400;  // Bad request (empty).
@@ -592,6 +630,7 @@ int Server::parse_request(Client *client)
        }
 
        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) {