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 service_name name of the service
53 * @param cfg configuration to use
54 * @return NULL on error (service unknown to configuration)
56 struct GNUNET_CLIENT_Connection *GNUNET_CLIENT_connect (const char
59 GNUNET_CONFIGURATION_Handle
64 * Configure this connection to ignore shutdown signals.
66 * @param h client handle
67 * @param do_ignore GNUNET_YES to ignore, GNUNET_NO to restore default
70 GNUNET_CLIENT_ignore_shutdown (struct GNUNET_CLIENT_Connection *h,
76 * Destroy connection with the service. This will automatically
77 * cancel any pending "receive" request (however, the handler will
78 * *NOT* be called, not even with a NULL message). Any pending
79 * transmission request will also be cancelled UNLESS the callback for
80 * the transmission request has already been called, in which case the
81 * transmission 'finish_pending_write' argument determines whether or
82 * not the write is guaranteed to complete before the socket is fully
83 * destroyed (unless, of course, there is an error with the server in
84 * which case the message may still be lost).
86 * @param sock handle to the service connection
87 * @param finish_pending_write should a transmission already passed to the
88 * handle be completed?
90 void GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock,
91 int finish_pending_write);
94 * Type of a function to call when we receive a message
98 * @param msg message received, NULL on timeout or fatal error
100 typedef void (*GNUNET_CLIENT_MessageHandler) (void *cls,
102 GNUNET_MessageHeader * msg);
105 * Type of a function to call when we have finished shutting
106 * down a service, or failed.
109 * @param reason what is the result of the shutdown
110 * GNUNET_NO on shutdown (not running)
111 * GNUNET_YES on running
112 * GNUNET_SYSERR on failure to transmit message
114 typedef void (*GNUNET_CLIENT_ShutdownTask) (void *cls, int reason);
117 * Read from the service.
119 * @param sock the service
120 * @param handler function to call with the message
121 * @param handler_cls closure for handler
122 * @param timeout how long to wait until timing out
124 void GNUNET_CLIENT_receive (struct GNUNET_CLIENT_Connection *sock,
125 GNUNET_CLIENT_MessageHandler handler,
127 struct GNUNET_TIME_Relative timeout);
131 * Transmit handle for client connections.
133 struct GNUNET_CLIENT_TransmitHandle;
137 * Ask the client to call us once the specified number of bytes
138 * are free in the transmission buffer. May call the notify
139 * method immediately if enough space is available.
141 * @param sock connection to the service
142 * @param size number of bytes to send
143 * @param timeout after how long should we give up (and call
144 * notify with buf NULL and size 0)?
145 * @param auto_retry if the connection to the service dies, should we
146 * automatically re-connect and retry (within the timeout period)
147 * or should we immediately fail in this case? Pass GNUNET_YES
148 * if the caller does not care about temporary connection errors,
149 * for example because the protocol is stateless
150 * @param notify function to call
151 * @param notify_cls closure for notify
152 * @return NULL if someone else is already waiting to be notified
153 * non-NULL if the notify callback was queued (can be used to cancel
154 * using GNUNET_CONNECTION_notify_transmit_ready_cancel)
156 struct GNUNET_CLIENT_TransmitHandle
157 *GNUNET_CLIENT_notify_transmit_ready (struct GNUNET_CLIENT_Connection *sock,
159 struct GNUNET_TIME_Relative timeout,
161 GNUNET_CONNECTION_TransmitReadyNotify
162 notify, void *notify_cls);
166 * Cancel a request for notification.
168 * @param th handle from the original request.
171 GNUNET_CLIENT_notify_transmit_ready_cancel (struct GNUNET_CLIENT_TransmitHandle
176 * Convenience API that combines sending a request
177 * to the service and waiting for a response.
178 * If either operation times out, the callback
179 * will be called with a "NULL" response (in which
180 * case the connection should probably be destroyed).
182 * @param sock connection to use
183 * @param hdr message to transmit
184 * @param timeout when to give up (for both transmission
185 * and for waiting for a response)
186 * @param auto_retry if the connection to the service dies, should we
187 * automatically re-connect and retry (within the timeout period)
188 * or should we immediately fail in this case? Pass GNUNET_YES
189 * if the caller does not care about temporary connection errors,
190 * for example because the protocol is stateless
191 * @param rn function to call with the response
192 * @param rn_cls closure for rn
193 * @return GNUNET_OK on success, GNUNET_SYSERR if a request
197 GNUNET_CLIENT_transmit_and_get_response (struct GNUNET_CLIENT_Connection *sock,
198 const struct GNUNET_MessageHeader *hdr,
199 struct GNUNET_TIME_Relative timeout,
201 GNUNET_CLIENT_MessageHandler rn,
206 * Wait until the service is running.
208 * @param service name of the service to wait for
209 * @param cfg configuration to use
210 * @param timeout how long to wait at most in ms
211 * @param task task to run if service is running
212 * (reason will be "PREREQ_DONE" (service running)
213 * or "TIMEOUT" (service not known to be running))
214 * @param task_cls closure for task
216 void GNUNET_CLIENT_service_test (const char *service,
217 const struct GNUNET_CONFIGURATION_Handle *cfg,
218 struct GNUNET_TIME_Relative timeout,
219 GNUNET_SCHEDULER_Task task, void *task_cls);
222 #if 0 /* keep Emacsens' auto-indent happy */
229 /* ifndef GNUNET_CLIENT_LIB_H */
231 /* end of gnunet_client_lib.h */