client_manager: add API for async operations

[oweals/gnunet.git] / src / include / gnunet_datacache_lib.h

diff --git a/src/include/gnunet_datacache_lib.h b/src/include/gnunet_datacache_lib.h
index 46d22d5eca8dd220adaaf5bfbaaf7a3b6d2d403f..edbba7de4e098dbe3b12cc017810ebafde5f255f 100644 (file)
--- a/src/include/gnunet_datacache_lib.h
+++ b/src/include/gnunet_datacache_lib.h
@@ -1,10 +1,10 @@
 /*
      This file is part of GNUnet
-     (C) 2006, 2009 Christian Grothoff (and other contributing authors)
+     Copyright (C) 2006, 2009, 2015 Christian Grothoff (and other contributing authors)
 
      GNUnet is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published
-     by the Free Software Foundation; either version 2, or (at your
+     by the Free Software Foundation; either version 3, or (at your
      option) any later version.
 
      GNUnet is distributed in the hope that it will be useful, but
@@ -56,10 +56,9 @@ struct GNUNET_DATACACHE_Handle;
  * @param section section in the configuration that contains our options
  * @return handle to use to access the service
  */
-struct GNUNET_DATACACHE_Handle *GNUNET_DATACACHE_create (const struct
-                                                         GNUNET_CONFIGURATION_Handle
-                                                         *cfg,
-                                                         const char *section);
+struct GNUNET_DATACACHE_Handle *
+GNUNET_DATACACHE_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                         const char *section);
 
 
 /**
@@ -67,25 +66,32 @@ struct GNUNET_DATACACHE_Handle *GNUNET_DATACACHE_create (const struct
  *
  * @param h handle to the datastore
  */
-void GNUNET_DATACACHE_destroy (struct GNUNET_DATACACHE_Handle *h);
+void
+GNUNET_DATACACHE_destroy (struct GNUNET_DATACACHE_Handle *h);
 
 
 /**
  * An iterator over a set of items stored in the datacache.
  *
  * @param cls closure
- * @param exp when will the content expire?
  * @param key key for the content
- * @param size number of bytes in data
+ * @param data_size number of bytes in @a data
  * @param data content stored
  * @param type type of the content
- * @return GNUNET_OK to continue iterating, GNUNET_SYSERR to abort
+ * @param exp when will the content expire?
+ * @param path_info_len number of entries in @a path_info
+ * @param path_info a path through the network
+ * @return #GNUNET_OK to continue iterating, #GNUNET_SYSERR to abort
  */
-typedef int (*GNUNET_DATACACHE_Iterator) (void *cls,
-                                          struct GNUNET_TIME_Absolute exp,
-                                          const GNUNET_HashCode * key,
-                                          size_t size, const char *data,
-                                          enum GNUNET_BLOCK_Type type);
+typedef int
+(*GNUNET_DATACACHE_Iterator) (void *cls,
+                              const struct GNUNET_HashCode *key,
+                              size_t data_size,
+                              const char *data,
+                              enum GNUNET_BLOCK_Type type,
+                              struct GNUNET_TIME_Absolute exp,
+                              unsigned int path_info_len,
+                              const struct GNUNET_PeerIdentity *path_info);
 
 
 /**
@@ -93,16 +99,23 @@ typedef int (*GNUNET_DATACACHE_Iterator) (void *cls,
  *
  * @param h handle to the datacache
  * @param key key to store data under
- * @param size number of bytes in data
+ * @param data_size number of bytes in @a data
  * @param data data to store
  * @param type type of the value
  * @param discard_time when to discard the value in any case
- * @return GNUNET_OK on success, GNUNET_SYSERR on error (full, etc.)
+ * @param path_info_len number of entries in @a path_info
+ * @param path_info a path through the network
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error, #GNUNET_NO if duplicate
  */
-int GNUNET_DATACACHE_put (struct GNUNET_DATACACHE_Handle *h,
-                          const GNUNET_HashCode * key, size_t size,
-                          const char *data, enum GNUNET_BLOCK_Type type,
-                          struct GNUNET_TIME_Absolute discard_time);
+int
+GNUNET_DATACACHE_put (struct GNUNET_DATACACHE_Handle *h,
+                      const struct GNUNET_HashCode *key,
+                      size_t data_size,
+                      const char *data,
+                      enum GNUNET_BLOCK_Type type,
+                      struct GNUNET_TIME_Absolute discard_time,
+                     unsigned int path_info_len,
+                     const struct GNUNET_PeerIdentity *path_info);
 
 
 /**
@@ -113,14 +126,50 @@ int GNUNET_DATACACHE_put (struct GNUNET_DATACACHE_Handle *h,
  * @param key what to look up
  * @param type entries of which type are relevant?
  * @param iter maybe NULL (to just count)
- * @param iter_cls closure for iter
+ * @param iter_cls closure for @a iter
+ * @return the number of results found
+ */
+unsigned int
+GNUNET_DATACACHE_get (struct GNUNET_DATACACHE_Handle *h,
+                      const struct GNUNET_HashCode *key,
+                      enum GNUNET_BLOCK_Type type,
+                      GNUNET_DATACACHE_Iterator iter,
+                      void *iter_cls);
+
+
+/**
+ * Obtain a random element from the datacache.
+ *
+ * @param h handle to the datacache
+ * @param iter maybe NULL (to just count)
+ * @param iter_cls closure for @a iter
+ * @return the number of results found (zero or 1)
+ */
+unsigned int
+GNUNET_DATACACHE_get_random (struct GNUNET_DATACACHE_Handle *h,
+                             GNUNET_DATACACHE_Iterator iter,
+                             void *iter_cls);
+
+
+/**
+ * Iterate over the results that are "close" to a particular key in
+ * the datacache.  "close" is defined as numerically larger than @a
+ * key (when interpreted as a circular address space), with small
+ * distance.
+ *
+ * @param h handle to the datacache
+ * @param key area of the keyspace to look into
+ * @param num_results number of results that should be returned to @a iter
+ * @param iter maybe NULL (to just count)
+ * @param iter_cls closure for @a iter
  * @return the number of results found
  */
-unsigned int GNUNET_DATACACHE_get (struct GNUNET_DATACACHE_Handle *h,
-                                   const GNUNET_HashCode * key,
-                                   enum GNUNET_BLOCK_Type type,
-                                   GNUNET_DATACACHE_Iterator iter,
-                                   void *iter_cls);
+unsigned int
+GNUNET_DATACACHE_get_closest (struct GNUNET_DATACACHE_Handle *h,
+                              const struct GNUNET_HashCode *key,
+                              unsigned int num_results,
+                              GNUNET_DATACACHE_Iterator iter,
+                              void *iter_cls);
 
 
 #if 0                           /* keep Emacsens' auto-indent happy */