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
* @file include/gnunet_fs_service.h
* @brief API for file-sharing via GNUnet
* @author Christian Grothoff
- *
- * TODO:
- * - extend API with support for publish simulation (-s)
- * and URI-argument binding to keyword/namespace (-u)
*/
#ifndef GNUNET_FS_LIB_H
#define GNUNET_FS_LIB_H
GNUNET_FS_uri_ksk_to_string_fancy (const struct GNUNET_FS_Uri *uri);
+/**
+ * Add the given keyword to the set of keywords represented by the URI.
+ * Does nothing if the keyword is already present.
+ *
+ * @param uri ksk uri to modify
+ * @param keyword keyword to add
+ * @param is_mandatory is this keyword mandatory?
+ */
+void
+GNUNET_FS_uri_ksk_add_keyword (struct GNUNET_FS_Uri *uri,
+ const char *keyword,
+ int is_mandatory);
+
+
+/**
+ * Remove the given keyword from the set of keywords represented by the URI.
+ * Does nothing if the keyword is not present.
+ *
+ * @param uri ksk uri to modify
+ * @param keyword keyword to add
+ */
+void
+GNUNET_FS_uri_ksk_remove_keyword (struct GNUNET_FS_Uri *uri,
+ const char *keyword);
+
+
/**
* Convert a UTF-8 String to a URI.
*
*/
struct GNUNET_FS_Uri *
GNUNET_FS_uri_loc_create (const struct GNUNET_FS_Uri *baseUri,
- struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_TIME_Absolute expiration_time);
char **emsg);
+/**
+ * Create an SKS URI from a namespace ID and an identifier.
+ *
+ * @param nsid namespace ID
+ * @param id identifier
+ * @return an FS URI for the given namespace and identifier
+ */
+struct GNUNET_FS_Uri *
+GNUNET_FS_uri_sks_create_from_nsid (GNUNET_HashCode *nsid,
+ const char *id);
+
+
/**
* Get the ID of a namespace from the given
* namespace URI.
*/
GNUNET_FS_STATUS_SEARCH_SUSPEND,
- /**
- * Event generated for each search result
- * when the respective search is suspended.
- */
- GNUNET_FS_STATUS_SEARCH_SUSPEND_RESULT,
-
/**
* This search has yielded a result.
*/
/**
* Context for controlling the upload.
*/
- struct GNUNET_FS_PublishContext *sc;
+ struct GNUNET_FS_PublishContext *pc;
/**
* Information about the file that is being publishd.
/**
* Depth of the given block in the tree;
- * 0 would be the highest level (the first
- * call is guaranteed to be for the lowest
- * level).
+ * 0 would be the lowest level (DBLOCKs).
*/
unsigned int depth;
*/
uint32_t anonymity;
+ /**
+ * Is the download currently active.
+ */
+ int is_active;
+
/**
* Additional values for specific events.
*/
struct {
/**
- * Data block we just obtained.
+ * Data block we just obtained, can be NULL (even if
+ * data_len > 0) if we found the entire block 'intact' on
+ * disk. In this case, it is also possible for 'data_len'
+ * to be larger than an individual (32k) block.
*/
const void *data;
/**
* Depth of the given block in the tree;
- * 0 would be the highest level (the first
- * call is guaranteed to be for the lowest
- * level).
+ * 0 would be the lowest level (DBLOCKS).
*/
unsigned int depth;
/**
* Client parent-context pointer; NULL for top-level searches,
- * non-NULL for automatically triggered searches for updates in
- * namespaces.
+ * refers to the client context of the associated search result
+ * for automatically triggered searches for updates in
+ * namespaces. In this case, 'presult' refers to that search
+ * result.
*/
void *pctx;
*/
struct GNUNET_FS_SearchResult *result;
+ /**
+ * Applicability rank (the larger, the better the result
+ * fits the search criteria).
+ */
+ uint32_t applicability_rank;
+
} result;
/**
/**
* Depth of the given block in the tree;
- * 0 would be the highest level (the first
- * call is guaranteed to be for the lowest
- * level).
+ * 0 would be the lowest level (DBLOCKS).
*/
unsigned int depth;
};
+/**
+ * Settings for publishing a block (which may of course also
+ * apply to an entire directory or file).
+ */
+struct GNUNET_FS_BlockOptions
+{
+
+ /**
+ * At what time should the block expire? Data blocks (DBLOCKS and
+ * IBLOCKS) may still be used even if they are expired (however,
+ * they'd be removed quickly from the datastore if we are short on
+ * space), all other types of blocks will no longer be returned
+ * after they expire.
+ */
+ struct GNUNET_TIME_Absolute expiration_time;
+
+ /**
+ * At which anonymity level should the block be shared?
+ * (0: no anonymity, 1: normal GAP, >1: with cover traffic).
+ */
+ uint32_t anonymity_level;
+
+ /**
+ * How important is it for us to store the block? If we run
+ * out of space, the highest-priority, non-expired blocks will
+ * be kept.
+ */
+ uint32_t content_priority;
+
+ /**
+ * How often should we try to migrate the block to other peers?
+ * Only used if "CONTENT_PUSHING" is set to YES, in which case we
+ * first push each block to other peers according to their
+ * replication levels. Once each block has been pushed that many
+ * times to other peers, blocks are chosen for migration at random.
+ * Naturally, there is no guarantee that the other peers will keep
+ * these blocks for any period of time (since they won't have any
+ * priority or might be too busy to even store the block in the
+ * first place).
+ */
+ uint32_t replication_level;
+
+};
+
+
+/**
+ * Return the current year (i.e. '2011').
+ */
+unsigned int
+GNUNET_FS_get_current_year (void);
+
+
+/**
+ * Convert a year to an expiration time of January 1st of that year.
+ *
+ * @param year a year (after 1970, please ;-)).
+ * @return absolute time for January 1st of that year.
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_FS_year_to_time (unsigned int year);
+
+
/**
* Handle to the file-sharing service.
*/
/**
* Setup a connection to the file-sharing service.
*
- * @param sched scheduler to use
* @param cfg configuration to use
* @param client_name unique identifier for this client
* @param upcb function to call to notify about FS actions
* @return NULL on error
*/
struct GNUNET_FS_Handle *
-GNUNET_FS_start (struct GNUNET_SCHEDULER_Handle *sched,
- const struct GNUNET_CONFIGURATION_Handle *cfg,
+GNUNET_FS_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *client_name,
GNUNET_FS_ProgressCallback upcb,
void *upcb_cls,
GNUNET_FS_stop (struct GNUNET_FS_Handle *h);
+/**
+ * Extract meta-data from a file.
+ *
+ * @param md metadata to set
+ * @param filename name of file to inspect
+ * @param extractors plugins to use
+ * @return GNUNET_SYSERR on error, otherwise the number
+ * of meta-data items obtained
+ */
+int
+GNUNET_FS_meta_data_extract_from_file (struct
+ GNUNET_CONTAINER_MetaData
+ *md, const char *filename,
+ struct EXTRACTOR_PluginList *
+ extractors);
+
+
/**
* Function called on entries in a GNUNET_FS_FileInformation publish-structure.
*
* @param length length of the file or directory
* @param meta metadata for the file or directory (can be modified)
* @param uri pointer to the keywords that will be used for this entry (can be modified)
- * @param anonymity pointer to selected anonymity level (can be modified)
- * @param priority pointer to selected priority (can be modified)
- * @param expirationTime pointer to selected expiration time (can be modified)
+ * @param bo block options (can be modified)
+ * @param do_index should we index (can be modified)
* @param client_info pointer to client context set upon creation (can be modified)
* @return GNUNET_OK to continue, GNUNET_NO to remove
* this entry from the directory, GNUNET_SYSERR
uint64_t length,
struct GNUNET_CONTAINER_MetaData *meta,
struct GNUNET_FS_Uri **uri,
- uint32_t *anonymity,
- uint32_t *priority,
- struct GNUNET_TIME_Absolute *expirationTime,
+ struct GNUNET_FS_BlockOptions *bo,
+ int *do_index,
void **client_info);
* @param meta metadata for the file
* @param do_index GNUNET_YES for index, GNUNET_NO for insertion,
* GNUNET_SYSERR for simulation
- * @param anonymity what is the desired anonymity level for sharing?
- * @param priority what is the priority for OUR node to
- * keep this file available? Use 0 for maximum anonymity and
- * minimum reliability...
- * @param expirationTime when should this content expire?
+ * @param bo block options
* @return publish structure entry for the file
*/
struct GNUNET_FS_FileInformation *
const struct GNUNET_FS_Uri *keywords,
const struct GNUNET_CONTAINER_MetaData *meta,
int do_index,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expirationTime);
+ const struct GNUNET_FS_BlockOptions *bo);
/**
* @param meta metadata for the file
* @param do_index GNUNET_YES for index, GNUNET_NO for insertion,
* GNUNET_SYSERR for simulation
- * @param anonymity what is the desired anonymity level for sharing?
- * @param priority what is the priority for OUR node to
- * keep this file available? Use 0 for maximum anonymity and
- * minimum reliability...
- * @param expirationTime when should this content expire?
+ * @param bo block options
* @return publish structure entry for the file
*/
struct GNUNET_FS_FileInformation *
const struct GNUNET_FS_Uri *keywords,
const struct GNUNET_CONTAINER_MetaData *meta,
int do_index,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expirationTime);
+ const struct GNUNET_FS_BlockOptions *bo);
/**
* @param meta metadata for the file
* @param do_index GNUNET_YES for index, GNUNET_NO for insertion,
* GNUNET_SYSERR for simulation
- * @param anonymity what is the desired anonymity level for sharing?
- * @param priority what is the priority for OUR node to
- * keep this file available? Use 0 for maximum anonymity and
- * minimum reliability...
- * @param expirationTime when should this content expire?
+ * @param bo block options
* @return publish structure entry for the file
*/
struct GNUNET_FS_FileInformation *
const struct GNUNET_FS_Uri *keywords,
const struct GNUNET_CONTAINER_MetaData *meta,
int do_index,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expirationTime);
+ const struct GNUNET_FS_BlockOptions *bo);
/**
* @param h handle to the file sharing subsystem
* @param dirname name of the directory to scan
* @param do_index should files be indexed or inserted
- * @param anonymity desired anonymity level
- * @param priority priority for publishing
- * @param expirationTime expiration for publication
+ * @param bo block options
* @param proc function to call on each entry
* @param proc_cls closure for proc
* @param emsg where to store an error message (on errors)
struct GNUNET_FS_Handle *h,
const char *dirname,
int do_index,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expirationTime,
+ const struct GNUNET_FS_BlockOptions *bo,
GNUNET_FS_FileProcessor proc,
void *proc_cls,
char **emsg);
* @param h handle to the file sharing subsystem
* @param dirname name of the directory to scan
* @param do_index should files be indexed or inserted
- * @param anonymity desired anonymity level
- * @param priority priority for publishing
- * @param expirationTime expiration for publication
+ * @param bo block options
* @param proc function called on each entry
* @param proc_cls closure for proc
* @param emsg where to store an error message (on errors)
struct GNUNET_FS_Handle *h,
const char *dirname,
int do_index,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expirationTime,
+ const struct GNUNET_FS_BlockOptions *bo,
GNUNET_FS_FileProcessor proc,
void *proc_cls,
char **emsg);
* @param scanner function used to get a list of files in a directory
* @param scanner_cls closure for scanner
* @param do_index should files in the hierarchy be indexed?
- * @param anonymity what is the desired anonymity level for sharing?
- * @param priority what is the priority for OUR node to
- * keep this file available? Use 0 for maximum anonymity and
- * minimum reliability...
- * @param expirationTime when should this content expire?
+ * @param bo block options
* @param emsg where to store an error message
* @return publish structure entry for the directory, NULL on error
*/
GNUNET_FS_DirectoryScanner scanner,
void *scanner_cls,
int do_index,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expirationTime,
+ const struct GNUNET_FS_BlockOptions *bo,
char **emsg);
* @param keywords under which keywords should this directory be available
* directly; can be NULL
* @param meta metadata for the directory
- * @param anonymity what is the desired anonymity level for sharing?
- * @param priority what is the priority for OUR node to
- * keep this file available? Use 0 for maximum anonymity and
- * minimum reliability...
- * @param expirationTime when should this content expire?
+ * @param bo block options
* @return publish structure entry for the directory , NULL on error
*/
struct GNUNET_FS_FileInformation *
void *client_info,
const struct GNUNET_FS_Uri *keywords,
const struct GNUNET_CONTAINER_MetaData *meta,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expirationTime);
+ const struct GNUNET_FS_BlockOptions *bo);
+
+
+/**
+ * Test if a given entry represents a directory.
+ *
+ * @param ent check if this FI represents a directory
+ * @return GNUNET_YES if so, GNUNET_NO if not
+ */
+int
+GNUNET_FS_file_information_is_directory (struct GNUNET_FS_FileInformation *ent);
/**
* @param ksk_uri keywords to use
* @param meta metadata to use
* @param uri URI to refer to in the KBlock
- * @param expirationTime when the KBlock expires
- * @param anonymity anonymity level for the KBlock
- * @param priority priority for the KBlock
+ * @param bo block options
+ * @param options publication options
* @param cont continuation
* @param cont_cls closure for cont
*/
const struct GNUNET_FS_Uri *ksk_uri,
const struct GNUNET_CONTAINER_MetaData *meta,
const struct GNUNET_FS_Uri *uri,
- struct GNUNET_TIME_Absolute expirationTime,
- uint32_t anonymity,
- uint32_t priority,
+ const struct GNUNET_FS_BlockOptions *bo,
enum GNUNET_FS_PublishOptions options,
GNUNET_FS_PublishContinuation cont,
void *cont_cls);
* @param update update identifier to use
* @param meta metadata to use
* @param uri URI to refer to in the SBlock
- * @param expirationTime when the SBlock expires
- * @param anonymity anonymity level for the SBlock
- * @param priority priority for the SBlock
+ * @param bo block options
+ * @param options publication options
* @param cont continuation
* @param cont_cls closure for cont
*/
const char *update,
const struct GNUNET_CONTAINER_MetaData *meta,
const struct GNUNET_FS_Uri *uri,
- struct GNUNET_TIME_Absolute expirationTime,
- uint32_t anonymity,
- uint32_t priority,
+ const struct GNUNET_FS_BlockOptions *bo,
enum GNUNET_FS_PublishOptions options,
GNUNET_FS_PublishContinuation cont,
void *cont_cls);
* @param ksk_uri keywords to use for advertisment
* @param namespace handle for the namespace that should be advertised
* @param meta meta-data for the namespace advertisement
- * @param anonymity for the namespace advertismement
- * @param priority for the namespace advertisement
- * @param expiration for the namespace advertisement
+ * @param bo block options
* @param rootEntry name of the root of the namespace
* @param cont continuation
* @param cont_cls closure for cont
struct GNUNET_FS_Uri *ksk_uri,
struct GNUNET_FS_Namespace *namespace,
const struct GNUNET_CONTAINER_MetaData *meta,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expiration,
+ const struct GNUNET_FS_BlockOptions *bo,
const char *rootEntry,
GNUNET_FS_PublishContinuation cont,
void *cont_cls);
/**
- * List all of the identifiers in the namespace for
- * which we could produce an update.
+ * List all of the identifiers in the namespace for which we could
+ * produce an update. Namespace updates form a graph where each node
+ * has a name. Each node can have any number of URI/meta-data entries
+ * which can each be linked to other nodes. Cycles are possible.
+ *
+ * Calling this function with "next_id" NULL will cause the library to
+ * call "ip" with a root for each strongly connected component of the
+ * graph (a root being a node from which all other nodes in the Scc
+ * are reachable).
+ *
+ * Calling this function with "next_id" being the name of a node will
+ * cause the library to call "ip" with all children of the node. Note
+ * that cycles within an SCC are possible (including self-loops).
*
* @param namespace namespace to inspect for updateable content
+ * @param next_id ID to look for; use NULL to look for SCC roots
* @param ip function to call on each updateable identifier
* @param ip_cls closure for ip
*/
void
GNUNET_FS_namespace_list_updateable (struct GNUNET_FS_Namespace *namespace,
+ const char *next_id,
GNUNET_FS_IdentifierProcessor ip,
void *ip_cls);
int do_delete);
-/**
- * Initialize collection.
- *
- * @param h handle to the file sharing subsystem
- * @param namespace namespace to use for the collection
- * @return GNUNET_OK on success, GNUNET_SYSERR if another
- * namespace is already set for our collection
- */
-int
-GNUNET_FS_collection_start (struct GNUNET_FS_Handle *h,
- struct GNUNET_FS_Namespace *namespace);
-
-
-/**
- * Stop collection.
- *
- * @param h handle to the file sharing subsystem
- * @return GNUNET_OK on success, GNUNET_SYSERR if no collection is active
- */
-int
-GNUNET_FS_collection_stop (struct GNUNET_FS_Handle *h);
-
-
-/**
- * Are we using a collection?
- *
- * @param h handle to the file sharing subsystem
- * @return NULL if there is no collection,
- */
-struct GNUNET_FS_Namespace *
-GNUNET_FS_collection_get(struct GNUNET_FS_Handle *h);
-
-
-/**
- * Publish an update of the current collection information to the
- * network now. The function has no effect if the collection has not
- * changed since the last publication. If we are currently not
- * collecting, this function does nothing.
- *
- * @param h handle to the file sharing subsystem
- */
-void GNUNET_FS_collection_publish (struct GNUNET_FS_Handle *h);
-
-
-/**
- * If we are currently building a collection, publish the given file
- * information in that collection. If we are currently not
- * collecting, this function does nothing.
- *
- * @param h handle to the file sharing subsystem
- * @param uri uri to add to the collection
- * @param meta metadata for the uri
- */
-void GNUNET_FS_collection_add (const struct GNUNET_FS_Handle *h,
- const struct GNUNET_FS_Uri *uri,
- const struct GNUNET_CONTAINER_MetaData *meta);
-
-
-
-
/* ******************** Directory API *********************** */
* @param offset offset of data in the directory
* @param dep function to call on each entry
* @param dep_cls closure for dep
+ * @return GNUNET_OK if this could be a block in a directory,
+ * GNUNET_NO if this could be part of a directory (but not 100% OK)
+ * GNUNET_SYSERR if 'data' does not represent a directory
*/
-void
+int
GNUNET_FS_directory_list_contents (size_t size,
const void *data,
uint64_t offset,
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