X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=server.h;h=cfb6b2e13680409314ba444f68dc023666d8de31;hp=65ac6b805435f413d4e6bd0f5bfbf84e747aacff;hb=f2e7dbf218365e3f47b942ea999796b2724ccc24;hpb=7850079d5f7a6700f96569fdbf2908a9b34a74ac diff --git a/server.h b/server.h index 65ac6b8..cfb6b2e 100644 --- a/server.h +++ b/server.h @@ -1,148 +1,210 @@ #ifndef _SERVER_H #define _SERVER_H 1 +#include #include -#include +#include +#include +#include +#include +#include +#include #include -#include +#include +#include + +#include "tlse.h" + +#include "client.h" +#include "stream.h" +#include "thread.h" + +class Acceptor; +class ClientProto; +struct Stream; -#define NUM_SERVERS 4 -#define BACKLOG_SIZE 1048576 #define EPOLL_MAX_EVENTS 8192 #define EPOLL_TIMEOUT_MS 20 #define MAX_CLIENT_REQUEST 16384 +#define REQUEST_READ_TIMEOUT_SEC 60 -class ClientProto; class CubemapStateProto; class StreamProto; -struct Client { - Client() {} - Client(int sock); - - // Serialization/deserialization. - Client(const ClientProto &serialized); - ClientProto serialize() const; - - // The file descriptor associated with this socket. - int sock; - - enum State { READING_REQUEST, SENDING_HEADER, SENDING_DATA }; - State state; - - // The HTTP request, as sent by the client. If we are in READING_REQUEST, - // this might not be finished. - std::string request; - - // What stream we're connecting to; parsed from . - // Not relevant for READING_REQUEST. - std::string stream_id; - - // The header we want to send. This is nominally a copy of Stream::header, - // but since that might change on reconnects etc., we keep a local copy here. - // Only relevant for SENDING_HEADER; blank otherwise. - std::string header; - - // Number of bytes we've sent of the header. Only relevant for SENDING_HEADER. - size_t header_bytes_sent; - - // Number of bytes we've sent of data. Only relevant for SENDING_DATA. - size_t bytes_sent; -}; - -struct Stream { - Stream(const std::string &stream_id); - ~Stream(); - - // Serialization/deserialization. - Stream(const StreamProto &serialized); - StreamProto serialize() const; - - std::string stream_id; - - // The HTTP response header, plus the video stream header (if any). - std::string header; - - // The stream data itself, stored in a circular buffer. - char *data; - - // How many bytes contains. Can very well be larger than BACKLOG_SIZE, - // since the buffer wraps. - size_t data_size; - -private: - Stream(const Stream& other); -}; - -class Server { +class Server : public Thread { public: Server(); - - // Start a new thread that handles clients. - void run(); - - // Stop the thread. - void stop(); - - CubemapStateProto serialize() const; - - void add_client(int sock); - void add_stream(const std::string &stream_id); - void set_header(const std::string &stream_id, const std::string &header); - void add_data(const std::string &stream_id, const char *data, size_t bytes); + ~Server(); + + // Get the list of all currently connected clients. + std::vector get_client_stats() const; + + // Set header (both HTTP header and any stream headers) for the given stream. + void set_header(int stream_index, + const std::string &http_header, + const std::string &stream_header); + + // Set that the given stream should use the given max pacing rate from now on. + // NOTE: This should be set before any clients are connected! + void set_pacing_rate(int stream_index, uint32_t pacing_rate); + + // These will be deferred until the next time an iteration in do_work() happens, + // and the order between them are undefined. + // XXX: header should ideally be ordered with respect to data. + void add_client_deferred(int sock, Acceptor *acceptor); + void add_data_deferred(int stream_index, const char *data, size_t bytes, uint16_t metacube_flags, const RationalPTS &pts); + + // These should not be called while running, since that would violate + // threading assumptions (ie., that epoll is only called from one thread + // at the same time). + CubemapStateProto serialize(std::unordered_map *short_response_pool); + void add_client_from_serialized(const ClientProto &client, const std::vector> &short_responses); + int add_stream(const std::string &url, + const std::string &hls_url, + size_t bytes_received, + size_t prebuffering_bytes, + Stream::Encoding encoding, + Stream::Encoding src_encoding, + unsigned hls_frag_duration, + size_t hls_backlog_margin, + const std::string &allow_origin); + int add_stream_from_serialized(const StreamProto &stream, int data_fd); + int lookup_stream_by_url(const std::string &url) const; + void set_backlog_size(int stream_index, size_t new_size); + void set_prebuffering_bytes(int stream_index, size_t new_amount); + void set_encoding(int stream_index, Stream::Encoding encoding); + void set_src_encoding(int stream_index, Stream::Encoding encoding); + void set_hls_frag_duration(int stream_index, unsigned hls_frag_duration); + void set_hls_backlog_margin(int stream_index, size_t hls_backlog_margin); + void set_allow_origin(int stream_index, const std::string &allow_origin); + void register_hls_url(int stream_index, const std::string &hls_url); + void add_gen204(const std::string &url, const std::string &allow_origin); + void create_tls_context_for_acceptor(const Acceptor *acceptor); private: - pthread_t worker_thread; + // Mutex protecting queued_add_clients. + // Note that if you want to hold both this and below, + // you will need to take before this one. + mutable std::mutex queued_clients_mutex; + + // Deferred commands that should be run from the do_work() thread as soon as possible. + // We defer these for two reasons: + // + // - We only want to fiddle with epoll from one thread at any given time, + // and doing add_client() from the acceptor thread would violate that. + // - We don't want the input thread(s) hanging on when doing + // add_data(), since they want to do add_data() rather often, and + // can be taken a lot of the time. + // + // Protected by . + std::vector> queued_add_clients; // All variables below this line are protected by the mutex. - pthread_mutex_t mutex; + mutable std::mutex mu; - // If the thread should stop or not. - bool should_stop; + // All streams. + std::vector> streams; - // Map from stream ID to stream. - std::map streams; + // Map from URL to index into . + std::unordered_map stream_url_map, stream_hls_url_map; + + // Map from URL to CORS Allow-Origin header (or empty string). + std::unordered_map ping_url_map; // Map from file descriptor to client. - std::map clients; + std::unordered_map clients; + + // A list of all clients, ordered by the time they connected (first element), + // and their file descriptor (second element). It is ordered by connection time + // (and thus also by read timeout time) so that we can read clients from the + // start and stop processing once we get to one that isn't ready to be + // timed out yet (which means we only have to look at each client exactly once, + // save for the first element of the queue, which is always checked). + // + // Note that when we delete a client, we don't update this queue. + // This means that when reading it, we need to check if the client it + // describes is still exists (ie., that the fd still exists, and that + // the timespec matches). + std::queue> clients_ordered_by_connect_time; // Used for epoll implementation (obviously). int epoll_fd; epoll_event events[EPOLL_MAX_EVENTS]; - // Clients that are in SENDING_DATA, but that we don't listen on, - // because we currently don't have any data for them. - // See put_client_to_sleep() and wake_up_all_clients(). - std::vector sleeping_clients; - - // Recover the this pointer, and call do_work(). - static void *do_work_thunk(void *arg); + // For each TLS-enabled acceptor, our private server context for its key pair. + std::unordered_map tls_server_contexts; // The actual worker thread. - void do_work(); - + virtual void do_work(); + + // Process a client; read and write data as far as we can. + // After this call, one of these four is true: + // + // 1. The socket is closed, and the client deleted. + // 2. We are still waiting for more data from the client. + // 3. We've sent all the data we have to the client, + // and put it in . + // 4. The socket buffer is full (which means we still have + // data outstanding). + // + // For #2, we listen for EPOLLIN events. For #3 and #4, we listen + // for EPOLLOUT in edge-triggered mode; it will never fire for #3, + // but it's cheaper than taking it in and out all the time. void process_client(Client *client); + // If the TLS library wants to write anything to this client, + // output it. Returns true if the processing should go to sleep + // (an error, or lack of outgoing buffer space). + bool send_pending_tls_data(Client *client); + + // Reads regular data fro ma socket. Returns -1 if the processing + // should go to sleep (an error, or no data available yet), otherwise + // the number of bytes read. + int read_nontls_data(Client *client, char *buf, size_t max_size); + + // Reads (decrypted) data from a TLS socket. Returns -1 if the processing + // should go to sleep (an error, or no data available yet), otherwise + // the number of bytes read. The buffer will be used as scratch space + // for TLS data, so it can be overwritten by more bytes than what is returned. + int read_tls_data(Client *client, char *buf, size_t max_size); + // Close a given client socket, and clean up after it. void close_client(Client *client); - // Parse the HTTP request. - void parse_request(Client *client); + // Listen for a different set of epoll events. + void change_epoll_events(Client *client, uint32_t events); + + // If we're supposed to listen for more requests (persistent HTTP connections), + // puts the client back into READING_REQUEST, changes its epoll flags and returns + // true. + bool more_requests(Client *client); - // Construct the HTTP header, and set the client into + // Parse the HTTP request. Returns a HTTP status code (200/204/400/404). + int parse_request(Client *client); + + // Construct the HTTP header for a regular stream, and set the client into + // the SENDING_HEADER state. + void construct_stream_header(Client *client); + + // Construct a HLS playlist (or get it from the cache), and set the client into // the SENDING_HEADER state. - void construct_header(Client *client); + void construct_hls_playlist(Client *client); + + // Construct a generic error with the given line, and set the client into + // the SENDING_SHORT_RESPONSE state. + void construct_error(Client *client, int error_code); + + // Construct a 204, and set the client into the SENDING_SHORT_RESPONSE state. + void construct_204(Client *client); - // Put client to sleep, since there is no more data for it; we will on - // longer listen on POLLOUT until we get more data. Also, it will be put - // in the list of clients to wake up when we do. - void put_client_to_sleep(Client *client); + void process_queued_data(); + void skip_lost_data(Client *client); - // We have more data, so mark all clients that are sleeping as ready to go. - void wake_up_all_clients(); + void add_client(int sock, Acceptor *acceptor); - // TODO: This function should probably die. - Stream *find_stream(const std::string &stream_id); + // Mark that a client just went into READING_REQUEST state, so we should + // note the current time of day and then put it into . + void start_client_timeout_timer(Client *client); }; #endif // !defined(_SERVER_H)