X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=server.h;h=0c172b5a306cc70f4fdd225d5708eaee4396b700;hp=49f9d51badedd68c02ae2e7436b6807f1eccb060;hb=7ec54788f88dde7b083ba6cfd30732b32295b54a;hpb=0e96bbf9ee0fbebd5fe3fba4d186c0e0d73c9a32 diff --git a/server.h b/server.h index 49f9d51..0c172b5 100644 --- a/server.h +++ b/server.h @@ -1,29 +1,45 @@ #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 EPOLL_MAX_EVENTS 8192 #define EPOLL_TIMEOUT_MS 20 #define MAX_CLIENT_REQUEST 16384 +#define REQUEST_READ_TIMEOUT_SEC 60 class CubemapStateProto; class StreamProto; +class HLSZombieProto; + +// See Server::hls_zombies, below. +struct HLSZombie { + std::string remote_addr; + std::string url; + std::string referer; + std::string user_agent; + timespec expires; +}; class Server : public Thread { public: @@ -33,11 +49,17 @@ public: // Get the list of all currently connected clients. std::vector get_client_stats() const; + // See hls_zombies, below. + std::vector get_hls_zombies(); + // 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); + // Sets the given stream as unavailable (will always return 503 to new clients). + void set_unavailable(int stream_index); + // 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); @@ -45,54 +67,106 @@ public: // 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); - void add_data_deferred(int stream_index, const char *data, size_t bytes, StreamStartSuitability suitable_for_stream_start); + 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(); - void add_client_from_serialized(const ClientProto &client); - int add_stream(const std::string &url, size_t bytes_received, size_t prebuffering_bytes, Stream::Encoding encoding); + 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); + void add_hls_zombie_from_serialized(const HLSZombieProto &hls_zombie); 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: // 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 pthread_mutex_t queued_clients_mutex; + // 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 + // - 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; + std::vector> queued_add_clients; // All variables below this line are protected by the mutex. - mutable pthread_mutex_t mutex; + mutable std::mutex mu; // All streams. - std::vector streams; + std::vector> streams; // Map from URL to index into . - std::map url_map; + 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; + + // HLS is harder to keep viewer statistics for than regular streams, + // since there's no 1:1 mapping between ongoing HTTP connections and + // actual viewers. After a HLS fragment has been successfully sent, + // we keep a note of that in this structure, so that we can add some + // fake entries in the .stats file for clients that we believe are still + // watching, but are not downloading anything right now. We clean this + // out whenever we write statistics centrally. + // + // The structure is keyed by X-Playback-Session-Id if it exists + // (typically iOS clients) or IP address otherwise; we can't use the socket, + // since clients can (and do) keep open multiple HTTP connections for + // the same video playack session, and may also close the socket + // between downloading fragments. This means multiple clients between + // the same NAT may be undercounted, but that's how it is. + std::unordered_map hls_zombies; // Used for epoll implementation (obviously). int epoll_fd; epoll_event events[EPOLL_MAX_EVENTS]; + // For each TLS-enabled acceptor, our private server context for its key pair. + std::unordered_map tls_server_contexts; + // The actual worker thread. virtual void do_work(); @@ -111,24 +185,59 @@ private: // 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_plain_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. Returns a HTTP status code (200/400/404). + // 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); + + // Parse the HTTP request. Returns a HTTP status code (200/204/400/404). int parse_request(Client *client); - // Construct the HTTP header, and set the client into + // Construct the HTTP header for a regular stream, and set the client into // the SENDING_HEADER state. - void construct_header(Client *client); + 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_hls_playlist(Client *client); // Construct a generic error with the given line, and set the client into - // the SENDING_ERROR state. + // 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); + void process_queued_data(); void skip_lost_data(Client *client); - void add_client(int sock); + void add_client(int sock, Acceptor *acceptor); + + // 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)