2 This file is part of GNUnet.
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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
69 void GNUNET_CLIENT_ignore_shutdown (struct GNUNET_CLIENT_Connection *h,
75 * Destroy connection with the service. This will automatically
76 * cancel any pending "receive" request (however, the handler will
77 * *NOT* be called, not even with a NULL message). Any pending
78 * transmission request will also be cancelled UNLESS the callback for
79 * the transmission request has already been called, in which case the
80 * transmission 'finish_pending_write' argument determines whether or
81 * not the write is guaranteed to complete before the socket is fully
82 * destroyed (unless, of course, there is an error with the server in
83 * which case the message may still be lost).
85 * @param sock handle to the service connection
86 * @param finish_pending_write should a transmission already passed to the
87 * handle be completed?
89 void GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock,
90 int finish_pending_write);
93 * Type of a function to call when we receive a message
97 * @param msg message received, NULL on timeout or fatal error
99 typedef void (*GNUNET_CLIENT_MessageHandler) (void *cls,
100 const struct GNUNET_MessageHeader
104 * Type of a function to call when we have finished shutting
105 * down a service, or failed.
108 * @param reason what is the result of the shutdown
109 * GNUNET_NO on shutdown (not running)
110 * GNUNET_YES on running
111 * GNUNET_SYSERR on failure to transmit message
113 typedef void (*GNUNET_CLIENT_ShutdownTask) (void *cls, int reason);
116 * Read from the service.
118 * @param sock the service
119 * @param handler function to call with the message
120 * @param handler_cls closure for handler
121 * @param timeout how long to wait until timing out
123 void GNUNET_CLIENT_receive (struct GNUNET_CLIENT_Connection *sock,
124 GNUNET_CLIENT_MessageHandler handler,
126 struct GNUNET_TIME_Relative timeout);
130 * Transmit handle for client connections.
132 struct GNUNET_CLIENT_TransmitHandle;
136 * Ask the client to call us once the specified number of bytes
137 * are free in the transmission buffer. May call the notify
138 * method immediately if enough space is available.
140 * @param sock connection to the service
141 * @param size number of bytes to send
142 * @param timeout after how long should we give up (and call
143 * notify with buf NULL and size 0)?
144 * @param auto_retry if the connection to the service dies, should we
145 * automatically re-connect and retry (within the timeout period)
146 * or should we immediately fail in this case? Pass GNUNET_YES
147 * if the caller does not care about temporary connection errors,
148 * for example because the protocol is stateless
149 * @param notify function to call
150 * @param notify_cls closure for notify
151 * @return NULL if someone else is already waiting to be notified
152 * non-NULL if the notify callback was queued (can be used to cancel
153 * using GNUNET_CONNECTION_notify_transmit_ready_cancel)
155 struct GNUNET_CLIENT_TransmitHandle *GNUNET_CLIENT_notify_transmit_ready (struct
156 GNUNET_CLIENT_Connection
165 GNUNET_CONNECTION_TransmitReadyNotify
172 * Cancel a request for notification.
174 * @param th handle from the original request.
176 void GNUNET_CLIENT_notify_transmit_ready_cancel (struct
177 GNUNET_CLIENT_TransmitHandle
182 * Convenience API that combines sending a request
183 * to the service and waiting for a response.
184 * If either operation times out, the callback
185 * will be called with a "NULL" response (in which
186 * case the connection should probably be destroyed).
188 * @param sock connection to use
189 * @param hdr message to transmit
190 * @param timeout when to give up (for both transmission
191 * and for waiting for a response)
192 * @param auto_retry if the connection to the service dies, should we
193 * automatically re-connect and retry (within the timeout period)
194 * or should we immediately fail in this case? Pass GNUNET_YES
195 * if the caller does not care about temporary connection errors,
196 * for example because the protocol is stateless
197 * @param rn function to call with the response
198 * @param rn_cls closure for rn
199 * @return GNUNET_OK on success, GNUNET_SYSERR if a request
202 int GNUNET_CLIENT_transmit_and_get_response (struct GNUNET_CLIENT_Connection
204 const struct GNUNET_MessageHeader
206 struct GNUNET_TIME_Relative
207 timeout, int auto_retry,
208 GNUNET_CLIENT_MessageHandler rn,
213 * Wait until the service is running.
215 * @param service name of the service to wait for
216 * @param cfg configuration to use
217 * @param timeout how long to wait at most in ms
218 * @param task task to run if service is running
219 * (reason will be "PREREQ_DONE" (service running)
220 * or "TIMEOUT" (service not known to be running))
221 * @param task_cls closure for task
223 void GNUNET_CLIENT_service_test (const char *service,
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 */