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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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
67 * Destroy connection with the service. This will automatically
68 * cancel any pending "receive" request (however, the handler will
69 * *NOT* be called, not even with a NULL message). Any pending
70 * transmission request will also be cancelled UNLESS the callback for
71 * the transmission request has already been called, in which case the
72 * transmission is guaranteed to complete before the socket is fully
73 * destroyed (unless, of course, there is an error with the server
74 * in which case the message may still be lost).
76 * @param sock handle to the service connection
78 void GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock);
81 * Type of a function to call when we receive a message
85 * @param msg message received, NULL on timeout or fatal error
87 typedef void (*GNUNET_CLIENT_MessageHandler) (void *cls,
89 GNUNET_MessageHeader * msg);
92 * Read from the service.
94 * @param sock the service
95 * @param handler function to call with the message
96 * @param handler_cls closure for handler
97 * @param timeout how long to wait until timing out
99 void GNUNET_CLIENT_receive (struct GNUNET_CLIENT_Connection *sock,
100 GNUNET_CLIENT_MessageHandler handler,
102 struct GNUNET_TIME_Relative timeout);
106 * Transmit handle for client connections.
108 struct GNUNET_CLIENT_TransmitHandle;
112 * Ask the client to call us once the specified number of bytes
113 * are free in the transmission buffer. May call the notify
114 * method immediately if enough space is available.
116 * @param sock connection to the service
117 * @param size number of bytes to send
118 * @param timeout after how long should we give up (and call
119 * notify with buf NULL and size 0)?
120 * @param auto_retry if the connection to the service dies, should we
121 * automatically re-connect and retry (within the timeout period)
122 * or should we immediately fail in this case? Pass GNUNET_YES
123 * if the caller does not care about temporary connection errors,
124 * for example because the protocol is stateless
125 * @param notify function to call
126 * @param notify_cls closure for notify
127 * @return NULL if someone else is already waiting to be notified
128 * non-NULL if the notify callback was queued (can be used to cancel
129 * using GNUNET_CONNECTION_notify_transmit_ready_cancel)
131 struct GNUNET_CLIENT_TransmitHandle
132 *GNUNET_CLIENT_notify_transmit_ready (struct GNUNET_CLIENT_Connection *sock,
134 struct GNUNET_TIME_Relative timeout,
136 GNUNET_CONNECTION_TransmitReadyNotify
142 * Cancel a request for notification.
144 * @param th handle from the original request.
147 GNUNET_CLIENT_notify_transmit_ready_cancel (struct GNUNET_CLIENT_TransmitHandle *th);
151 * Convenience API that combines sending a request
152 * to the service and waiting for a response.
153 * If either operation times out, the callback
154 * will be called with a "NULL" response (in which
155 * case the connection should probably be destroyed).
157 * @param sock connection to use
158 * @param hdr message to transmit
159 * @param timeout when to give up (for both transmission
160 * and for waiting for a response)
161 * @param auto_retry if the connection to the service dies, should we
162 * automatically re-connect and retry (within the timeout period)
163 * or should we immediately fail in this case? Pass GNUNET_YES
164 * if the caller does not care about temporary connection errors,
165 * for example because the protocol is stateless
166 * @param rn function to call with the response
167 * @param rn_cls closure for rn
168 * @return GNUNET_OK on success, GNUNET_SYSERR if a request
172 GNUNET_CLIENT_transmit_and_get_response (struct GNUNET_CLIENT_Connection *sock,
173 const struct GNUNET_MessageHeader *hdr,
174 struct GNUNET_TIME_Relative timeout,
176 GNUNET_CLIENT_MessageHandler rn,
182 * Request that the service should shutdown.
183 * Afterwards, the connection will automatically be
184 * disconnected. Hence the "sock" shoud not
185 * be used by the caller after this call
186 * (calling this function frees "sock" after a while).
188 * @param sock the socket connected to the service
190 void GNUNET_CLIENT_service_shutdown (struct GNUNET_CLIENT_Connection *sock);
194 * Wait until the service is running.
196 * @param sched scheduler to use
197 * @param service name of the service to wait for
198 * @param cfg configuration to use
199 * @param timeout how long to wait at most in ms
200 * @param task task to run if service is running
201 * (reason will be "PREREQ_DONE" (service running)
202 * or "TIMEOUT" (service not known to be running))
203 * @param task_cls closure for task
205 void GNUNET_CLIENT_service_test (struct GNUNET_SCHEDULER_Handle *sched,
207 const struct GNUNET_CONFIGURATION_Handle *cfg,
208 struct GNUNET_TIME_Relative timeout,
209 GNUNET_SCHEDULER_Task task, void *task_cls);
212 #if 0 /* keep Emacsens' auto-indent happy */
219 /* ifndef GNUNET_CLIENT_LIB_H */
221 /* end of gnunet_client_lib.h */