#ifndef _INPUT_H
#define _INPUT_H 1
-#include <vector>
+#include <stddef.h>
+#include <time.h>
#include <string>
-class InputProto;
-
-class Input {
-public:
- Input(const std::string &stream_id, const std::string &url);
-
- // Serialization/deserialization.
- Input(const InputProto &serialized);
- InputProto serialize() const;
-
- // Connect to the given URL and start streaming.
- void run();
-
- // Stops the streaming, but lets the file descriptor stay open.
- void stop();
-
- std::string get_url() const { return url; }
-
-private:
- // Recovers the this pointer and calls do_work().
- static void *do_work_thunk(void *arg);
-
- // Actually does the download.
- void do_work();
-
- // Open a socket that connects to the given host and port. Does DNS resolving.
- int lookup_and_connect(const std::string &host, const std::string &port);
+#include "thread.h"
- // Parses a HTTP response. Returns false if it not a 200.
- bool parse_response(const std::string &response);
-
- // Stores the given data, looks for Metacube blocks (skipping data if needed),
- // and calls process_block() for each one.
- void process_data(char *ptr, size_t bytes);
-
- // Drops <num_bytes> bytes from the head of <pending_data>,
- // and outputs a warning.
- void drop_pending_data(size_t num_bytes);
+class Input;
+class InputProto;
- enum State {
- NOT_CONNECTED,
- SENDING_REQUEST,
- RECEIVING_HEADER,
- RECEIVING_DATA,
- CLOSING_SOCKET, // Due to error.
- };
- State state;
+// Extremely rudimentary URL parsing.
+bool parse_url(const std::string &url, std::string *protocol, std::string *user, std::string *host, std::string *port, std::string *path);
- std::string stream_id;
+// Figure out the right type of input based on the URL, and create a new Input of the right type.
+// Will return NULL if unknown.
+Input *create_input(const std::string &url);
+Input *create_input(const InputProto &serialized);
- // The URL and its parsed components.
+// Digested statistics for writing to logs etc.
+struct InputStats {
std::string url;
- std::string host, port, path;
-
- // The HTTP request, with headers and all.
- // Only relevant for SENDING_REQUEST.
- std::string request;
-
- // How many bytes we've sent of the request so far.
- // Only relevant for SENDING_REQUEST.
- size_t request_bytes_sent;
- // The HTTP response we've received so far. Only relevant for RECEIVING_HEADER.
- std::string response;
+ // The number of bytes we have received so far, including any Metacube headers.
+ //
+ // Not reset across connections.
+ size_t bytes_received;
- // The HTTP respones headers we want to give clients for this input.
- std::string http_header;
+ // The number of data bytes we have received so far (or more precisely,
+ // number of data bytes we have sent on to the stream). This excludes Metacube
+ // headers and corrupted data we've skipped.
+ //
+ // Not reset across connections.
+ size_t data_bytes_received;
- // Data we have received but not fully processed yet.
- std::vector<char> pending_data;
+ // When the current connection was initiated. -1 if we are not currently connected.
+ time_t connect_time;
- // If <pending_data> starts with a Metacube header,
- // this is true.
- bool has_metacube_header;
-
- // The socket we are downloading on (or -1).
- int sock;
-
- // Handle to the thread that actually does the download.
- pthread_t worker_thread;
+ // TODO: Number of loss events might both be useful,
+ // similar to for clients. Also, per-connection byte counters.
+};
- // Whether we should stop or not.
- volatile bool should_stop;
+class Input : public Thread {
+public:
+ virtual ~Input();
+ virtual InputProto serialize() const = 0;
+ virtual std::string get_url() const = 0;
+ virtual void close_socket() = 0;
+ virtual void add_destination(int stream_index) = 0;
+
+ // Note: May be called from a different thread, so must be thread-safe.
+ virtual InputStats get_stats() const = 0;
};
#endif // !defined(_INPUT_H)