Make Input a bit more generic, to pave the way for UDP.

[cubemap] / httpinput.h

diff --git a/httpinput.h b/httpinput.h
new file mode 100644 (file)
index 0000000..894d8e9
--- /dev/null
+++ b/httpinput.h
@@ -0,0 +1,79 @@
+#ifndef _HTTPINPUT_H
+#define _HTTPINPUT_H 1
+
+#include <vector>
+#include <string>
+
+#include "input.h"
+
+class InputProto;
+
+class HTTPInput : public Input {
+public:
+       HTTPInput(const std::string &stream_id, const std::string &url);
+
+       // Serialization/deserialization.
+       HTTPInput(const InputProto &serialized);
+       virtual InputProto serialize() const;
+
+       virtual std::string get_url() const { return url; }
+
+private:
+       // Actually does the download.
+       virtual 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);
+
+       // 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);
+
+       enum State {
+               NOT_CONNECTED,
+               SENDING_REQUEST,
+               RECEIVING_HEADER,
+               RECEIVING_DATA,
+               CLOSING_SOCKET,  // Due to error.
+       };
+       State state;
+
+       std::string stream_id;
+
+       // The URL and its parsed components.
+       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 HTTP respones headers we want to give clients for this input.
+       std::string http_header;
+
+       // Data we have received but not fully processed yet.
+       std::vector<char> pending_data;
+
+       // 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;       
+};
+
+#endif  // !defined(_HTTPINPUT_H)