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3 (C) 2011, 2012 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file include/gnunet_stream_lib.h
23 * @brief stream handling using mesh API
24 * @author Sree Harsha Totakura
27 #ifndef GNUNET_STREAM_LIB_H
28 #define GNUNET_STREAM_LIB_H
38 #include "gnunet_util_lib.h"
39 #include "gnunet_mesh_service.h"
44 enum GNUNET_STREAM_Status
47 * All previous read/write operations are successfully done
52 * A timeout occured while reading/writing the stream
54 GNUNET_STREAM_TIMEOUT = 1,
57 * Other side has shutdown the socket for this type of operation
60 GNUNET_STREAM_SHUTDOWN = 2,
63 * A serious error occured while operating on this stream
65 GNUNET_STREAM_SYSERR = 3
69 * Opaque handler for stream
71 struct GNUNET_STREAM_Socket;
74 * Functions of this type will be called when a stream is established
76 * @param cls the closure from GNUNET_STREAM_open
77 * @param socket socket to use to communicate with the other side (read/write)
79 typedef void (*GNUNET_STREAM_OpenCallback) (void *cls,
80 struct GNUNET_STREAM_Socket *socket);
84 * Options for the stream.
86 enum GNUNET_STREAM_Option
89 * End of the option list.
91 GNUNET_STREAM_OPTION_END = 0,
94 * Option to set the initial retransmission timeout (when do we retransmit
95 * a packet that did not yield an acknowledgement for the first time?).
96 * Repeated retransmissions will then use an exponential back-off.
97 * Takes a 'struct GNUNET_TIME_Relative' as the only argument. A value
98 * of '0' means to use the round-trip time (plus a tiny grace period);
99 * this is also the default.
101 GNUNET_STREAM_OPTION_INITIAL_RETRANSMIT_TIMEOUT
106 * Tries to open a stream to the target peer
108 * @param cfg configuration to use
109 * @param target the target peer to which the stream has to be opened
110 * @param app_port the application port number which uniquely identifies this
112 * @param open_cb this function will be called after stream has be established
113 * @param open_cb_cls the closure for open_cb
114 * @param ... options to the stream, terminated by GNUNET_STREAM_OPTION_END
115 * @return if successful it returns the stream socket; NULL if stream cannot be
118 struct GNUNET_STREAM_Socket *
119 GNUNET_STREAM_open (const struct GNUNET_CONFIGURATION_Handle *cfg,
120 const struct GNUNET_PeerIdentity *target,
121 GNUNET_MESH_ApplicationType app_port,
122 GNUNET_STREAM_OpenCallback open_cb,
128 * Shutdown the stream for reading or writing (man 2 shutdown).
130 * @param socket the stream socket
131 * @param how SHUT_RD, SHUT_WR or SHUT_RDWR
134 GNUNET_STREAM_shutdown (struct GNUNET_STREAM_Socket *socket,
141 * @param socket the stream socket
144 GNUNET_STREAM_close (struct GNUNET_STREAM_Socket *socket);
148 * Functions of this type are called upon new stream connection from other peers
150 * @param cls the closure from GNUNET_STREAM_listen
151 * @param socket the socket representing the stream
152 * @param initiator the identity of the peer who wants to establish a stream
154 * @return GNUNET_OK to keep the socket open, GNUNET_SYSERR to close the
155 * stream (the socket will be invalid after the call)
157 typedef int (*GNUNET_STREAM_ListenCallback) (void *cls,
158 struct GNUNET_STREAM_Socket *socket,
160 GNUNET_PeerIdentity *initiator);
164 * A socket for listening.
166 struct GNUNET_STREAM_ListenSocket;
169 * Listens for stream connections for a specific application ports
171 * @param cfg the configuration to use
172 * @param app_port the application port for which new streams will be accepted
173 * @param listen_cb this function will be called when a peer tries to establish
175 * @param listen_cb_cls closure for listen_cb
176 * @return listen socket, NULL for any error
178 struct GNUNET_STREAM_ListenSocket *
179 GNUNET_STREAM_listen (const struct GNUNET_CONFIGURATION_Handle *cfg,
180 GNUNET_MESH_ApplicationType app_port,
181 GNUNET_STREAM_ListenCallback listen_cb,
182 void *listen_cb_cls);
186 * Closes the listen socket
188 * @param socket the listen socket
191 GNUNET_STREAM_listen_close (struct GNUNET_STREAM_ListenSocket *socket);
195 * Functions of this signature are called whenever writing operations
196 * on a stream are executed
198 * @param cls the closure from GNUNET_STREAM_write
199 * @param status the status of the stream at the time this function is called
200 * @param size the number of bytes written
202 typedef void (*GNUNET_STREAM_CompletionContinuation) (void *cls,
203 enum GNUNET_STREAM_Status
209 * Handle to cancel IO operations.
211 struct GNUNET_STREAM_IOHandle;
215 * Tries to write the given data to the stream
217 * @param socket the socket representing a stream
218 * @param data the data buffer from where the data is written into the stream
219 * @param size the number of bytes to be written from the data buffer
220 * @param timeout the timeout period
221 * @param write_cont the function to call upon writing some bytes into the stream
222 * @param write_cont_cls the closure
223 * @return handle to cancel the operation; NULL if a previous write is pending
225 struct GNUNET_STREAM_IOHandle *
226 GNUNET_STREAM_write (struct GNUNET_STREAM_Socket *socket,
229 struct GNUNET_TIME_Relative timeout,
230 GNUNET_STREAM_CompletionContinuation write_cont,
231 void *write_cont_cls);
235 * Functions of this signature are called whenever data is available from the
238 * @param cls the closure from GNUNET_STREAM_read
239 * @param status the status of the stream at the time this function is called
240 * @param data traffic from the other side
241 * @param size the number of bytes available in data read
242 * @return number of bytes of processed from 'data' (any data remaining should be
243 * given to the next time the read processor is called).
245 typedef size_t (*GNUNET_STREAM_DataProcessor) (void *cls,
246 enum GNUNET_STREAM_Status status,
252 * Tries to read data from the stream
254 * @param socket the socket representing a stream
255 * @param timeout the timeout period
256 * @param proc function to call with data (once only)
257 * @param proc_cls the closure for proc
258 * @return handle to cancel the operation
260 struct GNUNET_STREAM_IOHandle *
261 GNUNET_STREAM_read (const struct GNUNET_STREAM_Socket *socket,
262 struct GNUNET_TIME_Relative timeout,
263 GNUNET_STREAM_DataProcessor proc,
268 * Cancel pending read or write operation.
270 * @param ioh handle to operation to cancel
273 GNUNET_STREAM_io_cancel (struct GNUNET_STREAM_IOHandle *ioh);
283 #endif /* STREAM_PROTOCOL_H */