2 This file is part of GNUnet.
3 (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009 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_client_lib.h
23 * @brief functions related to accessing services
24 * @author Christian Grothoff
27 #ifndef GNUNET_CLIENT_LIB_H
28 #define GNUNET_CLIENT_LIB_H
33 #if 0 /* keep Emacsens' auto-indent happy */
38 #include "gnunet_common.h"
39 #include "gnunet_configuration_lib.h"
40 #include "gnunet_connection_lib.h"
41 #include "gnunet_scheduler_lib.h"
42 #include "gnunet_time_lib.h"
45 * Opaque handle for a connection to a service.
47 struct GNUNET_CLIENT_Connection;
50 * Get a connection with a service.
52 * @param sched scheduler to use
53 * @param service_name name of the service
54 * @param cfg configuration to use
55 * @return NULL on error (service unknown to configuration)
57 struct GNUNET_CLIENT_Connection *GNUNET_CLIENT_connect (struct
58 GNUNET_SCHEDULER_Handle
63 GNUNET_CONFIGURATION_Handle
68 * Configure this connection to ignore shutdown signals.
70 * @param h client handle
71 * @param do_ignore GNUNET_YES to ignore, GNUNET_NO to restore default
74 GNUNET_CLIENT_ignore_shutdown (struct GNUNET_CLIENT_Connection *h,
80 * Destroy connection with the service. This will automatically
81 * cancel any pending "receive" request (however, the handler will
82 * *NOT* be called, not even with a NULL message). Any pending
83 * transmission request will also be cancelled UNLESS the callback for
84 * the transmission request has already been called, in which case the
85 * transmission 'finish_pending_write' argument determines whether or
86 * not the write is guaranteed to complete before the socket is fully
87 * destroyed (unless, of course, there is an error with the server in
88 * which case the message may still be lost).
90 * @param sock handle to the service connection
91 * @param finish_pending_write should a transmission already passed to the
92 * handle be completed?
94 void GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock,
95 int finish_pending_write);
98 * Type of a function to call when we receive a message
102 * @param msg message received, NULL on timeout or fatal error
104 typedef void (*GNUNET_CLIENT_MessageHandler) (void *cls,
106 GNUNET_MessageHeader * msg);
109 * Type of a function to call when we have finished shutting
110 * down a service, or failed.
113 * @param reason what is the result of the shutdown
114 * GNUNET_NO on shutdown (not running)
115 * GNUNET_YES on running
116 * GNUNET_SYSERR on failure to transmit message
118 typedef void (*GNUNET_CLIENT_ShutdownTask) (void *cls,
122 * Read from the service.
124 * @param sock the service
125 * @param handler function to call with the message
126 * @param handler_cls closure for handler
127 * @param timeout how long to wait until timing out
129 void GNUNET_CLIENT_receive (struct GNUNET_CLIENT_Connection *sock,
130 GNUNET_CLIENT_MessageHandler handler,
132 struct GNUNET_TIME_Relative timeout);
136 * Transmit handle for client connections.
138 struct GNUNET_CLIENT_TransmitHandle;
142 * Ask the client to call us once the specified number of bytes
143 * are free in the transmission buffer. May call the notify
144 * method immediately if enough space is available.
146 * @param sock connection to the service
147 * @param size number of bytes to send
148 * @param timeout after how long should we give up (and call
149 * notify with buf NULL and size 0)?
150 * @param auto_retry if the connection to the service dies, should we
151 * automatically re-connect and retry (within the timeout period)
152 * or should we immediately fail in this case? Pass GNUNET_YES
153 * if the caller does not care about temporary connection errors,
154 * for example because the protocol is stateless
155 * @param notify function to call
156 * @param notify_cls closure for notify
157 * @return NULL if someone else is already waiting to be notified
158 * non-NULL if the notify callback was queued (can be used to cancel
159 * using GNUNET_CONNECTION_notify_transmit_ready_cancel)
161 struct GNUNET_CLIENT_TransmitHandle
162 *GNUNET_CLIENT_notify_transmit_ready (struct GNUNET_CLIENT_Connection *sock,
164 struct GNUNET_TIME_Relative timeout,
166 GNUNET_CONNECTION_TransmitReadyNotify
172 * Cancel a request for notification.
174 * @param th handle from the original request.
177 GNUNET_CLIENT_notify_transmit_ready_cancel (struct GNUNET_CLIENT_TransmitHandle *th);
181 * Convenience API that combines sending a request
182 * to the service and waiting for a response.
183 * If either operation times out, the callback
184 * will be called with a "NULL" response (in which
185 * case the connection should probably be destroyed).
187 * @param sock connection to use
188 * @param hdr message to transmit
189 * @param timeout when to give up (for both transmission
190 * and for waiting for a response)
191 * @param auto_retry if the connection to the service dies, should we
192 * automatically re-connect and retry (within the timeout period)
193 * or should we immediately fail in this case? Pass GNUNET_YES
194 * if the caller does not care about temporary connection errors,
195 * for example because the protocol is stateless
196 * @param rn function to call with the response
197 * @param rn_cls closure for rn
198 * @return GNUNET_OK on success, GNUNET_SYSERR if a request
202 GNUNET_CLIENT_transmit_and_get_response (struct GNUNET_CLIENT_Connection *sock,
203 const struct GNUNET_MessageHeader *hdr,
204 struct GNUNET_TIME_Relative timeout,
206 GNUNET_CLIENT_MessageHandler rn,
211 * Wait until the service is running.
213 * @param sched scheduler to use
214 * @param service name of the service to wait for
215 * @param cfg configuration to use
216 * @param timeout how long to wait at most in ms
217 * @param task task to run if service is running
218 * (reason will be "PREREQ_DONE" (service running)
219 * or "TIMEOUT" (service not known to be running))
220 * @param task_cls closure for task
222 void GNUNET_CLIENT_service_test (struct GNUNET_SCHEDULER_Handle *sched,
224 const struct GNUNET_CONFIGURATION_Handle *cfg,
225 struct GNUNET_TIME_Relative timeout,
226 GNUNET_SCHEDULER_Task task, void *task_cls);
229 #if 0 /* keep Emacsens' auto-indent happy */
236 /* ifndef GNUNET_CLIENT_LIB_H */
238 /* end of gnunet_client_lib.h */