X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=server.h;h=963aca9e36d9ca7c069871ad855bcb89a028f92a;hp=dea24d894e4cf9e5c9ea5ab7d3e96fa77f861a08;hb=dfa828027e66f823e1cd8e444dfb96492e296b42;hpb=75b7556a87926aa4ec3a2ac25c7a06d06c13396c diff --git a/server.h b/server.h index dea24d8..963aca9 100644 --- a/server.h +++ b/server.h @@ -1,72 +1,91 @@ #ifndef _SERVER_H #define _SERVER_H 1 -#include #include -#include +#include +#include +#include +#include +#include #include +#include +#include + +#include "client.h" +#include "stream.h" +#include "thread.h" + +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 -struct Client { - // 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 { - // 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[BACKLOG_SIZE]; - - // How many bytes contains. Can very well be larger than BACKLOG_SIZE, - // since the buffer wraps. - size_t data_size; -}; +class CubemapStateProto; +class MarkPool; +class StreamProto; -class Server { +class Server : public Thread { public: Server(); - - // Start a new thread that handles clients. - void run(); - 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 mark pool from now on. + // NOTE: This should be set before any clients are connected! + void set_mark_pool(int stream_index, MarkPool *mark_pool); + + // 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); + + // 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, Stream::Encoding encoding); + 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_encoding(int stream_index, Stream::Encoding encoding); private: - pthread_mutex_t mutex; - - // Map from stream ID to stream. - std::map streams; + // Mutex protecting queued_add_clients and streams[..]->queued_data. + // Note that if you want to hold both this and below, + // you will need to take before this one. + mutable pthread_mutex_t queued_data_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. + mutable pthread_mutex_t mutex; + + // All streams. + std::vector streams; + + // Map from URL to index into . + std::map url_map; // Map from file descriptor to client. std::map clients; @@ -75,33 +94,42 @@ private: 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); - // 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); // Close a given client socket, and clean up after it. void close_client(Client *client); - // Parse the HTTP request, construct the header, and set the client into + // Parse the HTTP request. Returns a HTTP status code (200/400/404). + int parse_request(Client *client); + + // Construct the HTTP header, and set the client into // the SENDING_HEADER state. - void parse_request(Client *client); + void construct_header(Client *client); + + // Construct a generic error with the given line, and set the client into + // the SENDING_ERROR state. + void construct_error(Client *client, int error_code); - // 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); }; #endif // !defined(_SERVER_H)