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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6 it under the terms of the GNU General Public License as published
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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
67 * Destroy connection with the service. This will
68 * automatically cancel any pending "receive" request
69 * (however, the handler will *NOT* be called, not
70 * even with a NULL message).
72 void GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock);
75 * Type of a function to call when we receive a message
79 * @param msg message received, NULL on timeout or fatal error
81 typedef void (*GNUNET_CLIENT_MessageHandler) (void *cls,
83 GNUNET_MessageHeader * msg);
86 * Read from the service.
88 * @param sock the service
89 * @param handler function to call with the message
90 * @param handler_cls closure for handler
91 * @param timeout how long to wait until timing out
93 void GNUNET_CLIENT_receive (struct GNUNET_CLIENT_Connection *sock,
94 GNUNET_CLIENT_MessageHandler handler,
96 struct GNUNET_TIME_Relative timeout);
100 * Transmit handle for client connections.
102 struct GNUNET_CLIENT_TransmitHandle;
106 * Ask the client to call us once the specified number of bytes
107 * are free in the transmission buffer. May call the notify
108 * method immediately if enough space is available.
110 * @param sock connection to the service
111 * @param size number of bytes to send
112 * @param timeout after how long should we give up (and call
113 * notify with buf NULL and size 0)?
114 * @param auto_retry if the connection to the service dies, should we
115 * automatically re-connect and retry (within the timeout period)
116 * or should we immediately fail in this case? Pass GNUNET_YES
117 * if the caller does not care about temporary connection errors,
118 * for example because the protocol is stateless
119 * @param notify function to call
120 * @param notify_cls closure for notify
121 * @return NULL if someone else is already waiting to be notified
122 * non-NULL if the notify callback was queued (can be used to cancel
123 * using GNUNET_CONNECTION_notify_transmit_ready_cancel)
125 struct GNUNET_CLIENT_TransmitHandle
126 *GNUNET_CLIENT_notify_transmit_ready (struct GNUNET_CLIENT_Connection *sock,
128 struct GNUNET_TIME_Relative timeout,
130 GNUNET_CONNECTION_TransmitReadyNotify
136 * Cancel a request for notification.
138 * @param th handle from the original request.
141 GNUNET_CLIENT_notify_transmit_ready_cancel (struct GNUNET_CLIENT_TransmitHandle *th);
145 * Convenience API that combines sending a request
146 * to the service and waiting for a response.
147 * If either operation times out, the callback
148 * will be called with a "NULL" response (in which
149 * case the connection should probably be destroyed).
151 * @param sock connection to use
152 * @param hdr message to transmit
153 * @param timeout when to give up (for both transmission
154 * and for waiting for a response)
155 * @param auto_retry if the connection to the service dies, should we
156 * automatically re-connect and retry (within the timeout period)
157 * or should we immediately fail in this case? Pass GNUNET_YES
158 * if the caller does not care about temporary connection errors,
159 * for example because the protocol is stateless
160 * @param rn function to call with the response
161 * @param rn_cls closure for rn
162 * @return GNUNET_OK on success, GNUNET_SYSERR if a request
166 GNUNET_CLIENT_transmit_and_get_response (struct GNUNET_CLIENT_Connection *sock,
167 const struct GNUNET_MessageHeader *hdr,
168 struct GNUNET_TIME_Relative timeout,
170 GNUNET_CLIENT_MessageHandler rn,
176 * Request that the service should shutdown.
177 * Afterwards, the connection should be disconnected.
179 * @param sock the socket connected to the service
181 void GNUNET_CLIENT_service_shutdown (struct GNUNET_CLIENT_Connection *sock);
185 * Wait until the service is running.
187 * @param sched scheduler to use
188 * @param service name of the service to wait for
189 * @param cfg configuration to use
190 * @param timeout how long to wait at most in ms
191 * @param task task to run if service is running
192 * (reason will be "PREREQ_DONE" (service running)
193 * or "TIMEOUT" (service not known to be running))
194 * @param task_cls closure for task
196 void GNUNET_CLIENT_service_test (struct GNUNET_SCHEDULER_Handle *sched,
198 const struct GNUNET_CONFIGURATION_Handle *cfg,
199 struct GNUNET_TIME_Relative timeout,
200 GNUNET_SCHEDULER_Task task, void *task_cls);
203 #if 0 /* keep Emacsens' auto-indent happy */
210 /* ifndef GNUNET_CLIENT_LIB_H */
212 /* end of gnunet_client_lib.h */