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|
/*
This file is part of GNUnet
(C) 2012 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 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file datastore/plugin_datastore_heap.c
* @brief heap-based datastore backend; usually we want the datastore
* to be persistent, and storing data in the heap is obviously
* NOT going to be persistent; still, this plugin is useful for
* testing/benchmarking --- but never for production!
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_datastore_plugin.h"
/**
* A value that we are storing.
*/
struct Value
{
/**
* Key for the value.
*/
struct GNUNET_HashCode key;
/**
* Pointer to the value's data (allocated at the end of this struct).
*/
const void *data;
/**
* Entry for this value in the 'expire' heap.
*/
struct GNUNET_CONTAINER_HeapNode *expire_heap;
/**
* Entry for this value in the 'replication' heap.
*/
struct GNUNET_CONTAINER_HeapNode *replication_heap;
/**
* Expiration time for this value.
*/
struct GNUNET_TIME_Absolute expiration;
/**
* Offset of this value in the array of the 'struct ZeroAnonByType';
* only used if anonymity is zero.
*/
unsigned int zero_anon_offset;
/**
* Number of bytes in 'data'.
*/
uint32_t size;
/**
* Priority of the value.
*/
uint32_t priority;
/**
* Anonymity level for the value.
*/
uint32_t anonymity;
/**
* Replication level for the value.
*/
uint32_t replication;
/**
* Type of 'data'.
*/
enum GNUNET_BLOCK_Type type;
};
/**
* We organize 0-anonymity values in arrays "by type".
*/
struct ZeroAnonByType
{
/**
* We keep these in a DLL.
*/
struct ZeroAnonByType *next;
/**
* We keep these in a DLL.
*/
struct ZeroAnonByType *prev;
/**
* Array of 0-anonymity items of the given type.
*/
struct Value **array;
/**
* Allocated size of the array.
*/
unsigned int array_size;
/**
* First unused offset in 'array'.
*/
unsigned int array_pos;
/**
* Type of all of the values in 'array'.
*/
enum GNUNET_BLOCK_Type type;
};
/**
* Context for all functions in this plugin.
*/
struct Plugin
{
/**
* Our execution environment.
*/
struct GNUNET_DATASTORE_PluginEnvironment *env;
/**
* Mapping from keys to 'struct Value's.
*/
struct GNUNET_CONTAINER_MultiHashMap *keyvalue;
/**
* Heap organized by minimum expiration time.
*/
struct GNUNET_CONTAINER_Heap *by_expiration;
/**
* Heap organized by maximum replication value.
*/
struct GNUNET_CONTAINER_Heap *by_replication;
/**
* Head of list of arrays containing zero-anonymity values by type.
*/
struct ZeroAnonByType *zero_head;
/**
* Tail of list of arrays containing zero-anonymity values by type.
*/
struct ZeroAnonByType *zero_tail;
/**
* Size of all values we're storing.
*/
unsigned long long size;
};
/**
* Get an estimate of how much space the database is
* currently using.
*
* @param cls our "struct Plugin*"
* @return number of bytes used on disk
*/
static unsigned long long
heap_plugin_estimate_size (void *cls)
{
struct Plugin *plugin = cls;
return plugin->size;
}
/**
* Store an item in the datastore.
*
* @param cls closure
* @param key key for the item
* @param size number of bytes in data
* @param data content stored
* @param type type of the content
* @param priority priority of the content
* @param anonymity anonymity-level for the content
* @param replication replication-level for the content
* @param expiration expiration time for the content
* @param msg set to error message
* @return GNUNET_OK on success
*/
static int
heap_plugin_put (void *cls,
const struct GNUNET_HashCode * key,
uint32_t size,
const void *data,
enum GNUNET_BLOCK_Type type,
uint32_t priority, uint32_t anonymity,
uint32_t replication,
struct GNUNET_TIME_Absolute expiration, char **msg)
{
struct Plugin *plugin = cls;
struct Value *value;
value = GNUNET_malloc (sizeof (struct Value) + size);
value->key = *key;
value->data = &value[1];
value->expire_heap = GNUNET_CONTAINER_heap_insert (plugin->by_expiration,
value,
expiration.abs_value);
value->replication_heap = GNUNET_CONTAINER_heap_insert (plugin->by_replication,
value,
replication);
value->expiration = expiration;
if (0 == anonymity)
{
struct ZeroAnonByType *zabt;
for (zabt = plugin->zero_head; NULL != zabt; zabt = zabt->next)
if (zabt->type == type)
break;
if (NULL == zabt)
{
zabt = GNUNET_malloc (sizeof (struct ZeroAnonByType));
zabt->type = type;
GNUNET_CONTAINER_DLL_insert (plugin->zero_head,
plugin->zero_tail,
zabt);
}
if (zabt->array_size == zabt->array_pos)
{
GNUNET_array_grow (zabt->array,
zabt->array_size,
zabt->array_size * 2 + 4);
}
value->zero_anon_offset = zabt->array_pos;
zabt->array[zabt->array_pos++] = value;
}
value->size = size;
value->priority = priority;
value->anonymity = anonymity;
value->replication = replication;
value->type = type;
memcpy (&value[1], data, size);
GNUNET_CONTAINER_multihashmap_put (plugin->keyvalue,
&value->key,
value,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
plugin->size += size;
return GNUNET_OK;
}
/**
* Delete the given value, removing it from the plugin's data
* structures.
*
* @param plugin the plugin
* @param value value to delete
*/
static void
delete_value (struct Plugin *plugin,
struct Value *value)
{
GNUNET_assert (GNUNET_YES ==
GNUNET_CONTAINER_multihashmap_remove (plugin->keyvalue,
&value->key,
value));
GNUNET_assert (value == GNUNET_CONTAINER_heap_remove_node (value->expire_heap));
GNUNET_assert (value == GNUNET_CONTAINER_heap_remove_node (value->replication_heap));
if (0 == value->anonymity)
{
struct ZeroAnonByType *zabt;
for (zabt = plugin->zero_head; NULL != zabt; zabt = zabt->next)
if (zabt->type == value->type)
break;
GNUNET_assert (NULL != zabt);
zabt->array[value->zero_anon_offset] = zabt->array[--zabt->array_pos];
zabt->array[value->zero_anon_offset]->zero_anon_offset = value->zero_anon_offset;
if (0 == zabt->array_pos)
{
GNUNET_array_grow (zabt->array,
zabt->array_size,
0);
GNUNET_CONTAINER_DLL_remove (plugin->zero_head,
plugin->zero_tail,
zabt);
GNUNET_free (zabt);
}
}
plugin->size -= value->size;
GNUNET_free (value);
}
/**
* Closure for iterator called during 'get_key'.
*/
struct GetContext
{
/**
* Desired result offset / number of results.
*/
uint64_t offset;
/**
* The plugin.
*/
struct Plugin *plugin;
/**
* Requested value hash.
*/
const struct GNUNET_HashCode * vhash;
/**
* Requested type.
*/
enum GNUNET_BLOCK_Type type;
/**
* Function to call with the result.
*/
PluginDatumProcessor proc;
/**
* Closure for 'proc'.
*/
void *proc_cls;
};
/**
* Test if a value matches the specification from the 'get' context
*
* @param gc query
* @param value the value to check against the query
* @return GNUNET_YES if the value matches
*/
static int
match (const struct GetContext *gc,
struct Value *value)
{
struct GNUNET_HashCode vh;
if ( (gc->type != GNUNET_BLOCK_TYPE_ANY) &&
(gc->type != value->type) )
return GNUNET_NO;
if (NULL != gc->vhash)
{
GNUNET_CRYPTO_hash (&value[1], value->size, &vh);
if (0 != memcmp (&vh, gc->vhash, sizeof (struct GNUNET_HashCode)))
return GNUNET_NO;
}
return GNUNET_YES;
}
/**
* Count number of matching values.
*
* @param cls the 'struct GetContext'
* @param key unused
* @param val the 'struct Value'
* @return GNUNET_YES (continue iteration)
*/
static int
count_iterator (void *cls,
const struct GNUNET_HashCode *key,
void *val)
{
struct GetContext *gc = cls;
struct Value *value = val;
if (GNUNET_NO == match (gc, value))
return GNUNET_OK;
gc->offset++;
return GNUNET_OK;
}
/**
* Obtain matching value at 'offset'.
*
* @param cls the 'struct GetContext'
* @param key unused
* @param val the 'struct Value'
* @return GNUNET_YES (continue iteration), GNUNET_NO if result was found
*/
static int
get_iterator (void *cls,
const struct GNUNET_HashCode *key,
void *val)
{
struct GetContext *gc = cls;
struct Value *value = val;
if (GNUNET_NO == match (gc, value))
return GNUNET_OK;
if (0 != gc->offset--)
return GNUNET_OK;
if (GNUNET_NO ==
gc->proc (gc->proc_cls,
key,
value->size,
&value[1],
value->type,
value->priority,
value->anonymity,
value->expiration,
(uint64_t) (long) value))
delete_value (gc->plugin, value);
return GNUNET_NO;
}
/**
* Get one of the results for a particular key in the datastore.
*
* @param cls closure
* @param offset offset of the result (modulo num-results);
* specific ordering does not matter for the offset
* @param key maybe NULL (to match all entries)
* @param vhash hash of the value, maybe NULL (to
* match all values that have the right key).
* Note that for DBlocks there is no difference
* betwen key and vhash, but for other blocks
* there may be!
* @param type entries of which type are relevant?
* Use 0 for any type.
* @param proc function to call on each matching value;
* will be called with NULL if nothing matches
* @param proc_cls closure for proc
*/
static void
heap_plugin_get_key (void *cls, uint64_t offset,
const struct GNUNET_HashCode *key,
const struct GNUNET_HashCode *vhash,
enum GNUNET_BLOCK_Type type, PluginDatumProcessor proc,
void *proc_cls)
{
struct Plugin *plugin = cls;
struct GetContext gc;
gc.plugin = plugin;
gc.offset = 0;
gc.vhash = vhash;
gc.type = type;
gc.proc = proc;
gc.proc_cls = proc_cls;
if (NULL == key)
{
GNUNET_CONTAINER_multihashmap_iterate (plugin->keyvalue,
&count_iterator,
&gc);
if (0 == gc.offset)
{
proc (proc_cls,
NULL, 0, NULL, 0, 0, 0, GNUNET_TIME_UNIT_ZERO_ABS, 0);
return;
}
gc.offset = offset % gc.offset;
GNUNET_CONTAINER_multihashmap_iterate (plugin->keyvalue,
&get_iterator,
&gc);
}
else
{
GNUNET_CONTAINER_multihashmap_get_multiple (plugin->keyvalue,
key,
&count_iterator,
&gc);
if (0 == gc.offset)
{
proc (proc_cls,
NULL, 0, NULL, 0, 0, 0, GNUNET_TIME_UNIT_ZERO_ABS, 0);
return;
}
gc.offset = offset % gc.offset;
GNUNET_CONTAINER_multihashmap_get_multiple (plugin->keyvalue,
key,
&get_iterator,
&gc);
}
}
/**
* Get a random item for replication. Returns a single, not expired,
* random item from those with the highest replication counters. The
* item's replication counter is decremented by one IF it was positive
* before. Call 'proc' with all values ZERO or NULL if the datastore
* is empty.
*
* @param cls closure
* @param proc function to call the value (once only).
* @param proc_cls closure for proc
*/
static void
heap_plugin_get_replication (void *cls,
PluginDatumProcessor proc,
void *proc_cls)
{
struct Plugin *plugin = cls;
struct Value *value;
value = GNUNET_CONTAINER_heap_remove_root (plugin->by_replication);
if (NULL == value)
{
proc (proc_cls,
NULL, 0, NULL, 0, 0, 0, GNUNET_TIME_UNIT_ZERO_ABS, 0);
return;
}
if (value->replication > 0)
{
value->replication--;
value->replication_heap = GNUNET_CONTAINER_heap_insert (plugin->by_replication,
value,
value->replication);
}
else
{
/* need a better way to pick a random item, replication level is always 0 */
value->replication_heap = GNUNET_CONTAINER_heap_insert (plugin->by_replication,
value,
value->replication);
value = GNUNET_CONTAINER_heap_walk_get_next (plugin->by_replication);
}
if (GNUNET_NO ==
proc (proc_cls,
&value->key,
value->size,
&value[1],
value->type,
value->priority,
value->anonymity,
value->expiration,
(uint64_t) (long) value))
delete_value (plugin, value);
}
/**
* Get a random item for expiration. Call 'proc' with all values ZERO
* or NULL if the datastore is empty.
*
* @param cls closure
* @param proc function to call the value (once only).
* @param proc_cls closure for proc
*/
static void
heap_plugin_get_expiration (void *cls, PluginDatumProcessor proc,
void *proc_cls)
{
struct Plugin *plugin = cls;
struct Value *value;
value = GNUNET_CONTAINER_heap_peek (plugin->by_expiration);
if (NULL == value)
{
proc (proc_cls,
NULL, 0, NULL, 0, 0, 0, GNUNET_TIME_UNIT_ZERO_ABS, 0);
return;
}
if (GNUNET_NO ==
proc (proc_cls,
&value->key,
value->size,
&value[1],
value->type,
value->priority,
value->anonymity,
value->expiration,
(uint64_t) (long) value))
delete_value (plugin, value);
}
/**
* Update the priority for a particular key in the datastore. If
* the expiration time in value is different than the time found in
* the datastore, the higher value should be kept. For the
* anonymity level, the lower value is to be used. The specified
* priority should be added to the existing priority, ignoring the
* priority in value.
*
* @param cls our "struct Plugin*"
* @param uid unique identifier of the datum
* @param delta by how much should the priority
* change? If priority + delta < 0 the
* priority should be set to 0 (never go
* negative).
* @param expire new expiration time should be the
* MAX of any existing expiration time and
* this value
* @param msg set to error message
* @return GNUNET_OK on success
*/
static int
heap_plugin_update (void *cls,
uint64_t uid,
int delta,
struct GNUNET_TIME_Absolute expire, char **msg)
{
struct Plugin *plugin = cls;
struct Value *value;
value = (struct Value*) (long) uid;
GNUNET_assert (NULL != value);
if (value->expiration.abs_value != expire.abs_value)
{
value->expiration = expire;
GNUNET_CONTAINER_heap_update_cost (plugin->by_expiration,
value->expire_heap,
expire.abs_value);
}
if ( (delta < 0) && (value->priority < - delta) )
value->priority = 0;
else
value->priority += delta;
return GNUNET_OK;
}
/**
* Call the given processor on an item with zero anonymity.
*
* @param cls our "struct Plugin*"
* @param offset offset of the result (modulo num-results);
* specific ordering does not matter for the offset
* @param type entries of which type should be considered?
* Use 0 for any type.
* @param proc function to call on each matching value;
* will be called with NULL if no value matches
* @param proc_cls closure for proc
*/
static void
heap_plugin_get_zero_anonymity (void *cls, uint64_t offset,
enum GNUNET_BLOCK_Type type,
PluginDatumProcessor proc, void *proc_cls)
{
struct Plugin *plugin = cls;
struct ZeroAnonByType *zabt;
struct Value *value;
uint64_t count;
count = 0;
for (zabt = plugin->zero_head; NULL != zabt; zabt = zabt->next)
{
if ( (type != GNUNET_BLOCK_TYPE_ANY) &&
(type != zabt->type) )
continue;
count += zabt->array_pos;
}
if (0 == count)
{
proc (proc_cls,
NULL, 0, NULL, 0, 0, 0, GNUNET_TIME_UNIT_ZERO_ABS, 0);
return;
}
offset = offset % count;
for (zabt = plugin->zero_head; NULL != zabt; zabt = zabt->next)
{
if ( (type != GNUNET_BLOCK_TYPE_ANY) &&
(type != zabt->type) )
continue;
if (offset >= zabt->array_pos)
{
offset -= zabt->array_pos;
continue;
}
break;
}
GNUNET_assert (NULL != zabt);
value = zabt->array[offset];
if (GNUNET_NO ==
proc (proc_cls,
&value->key,
value->size,
&value[1],
value->type,
value->priority,
value->anonymity,
value->expiration,
(uint64_t) (long) value))
delete_value (plugin, value);
}
/**
* Drop database.
*/
static void
heap_plugin_drop (void *cls)
{
/* nothing needs to be done */
}
/**
* Closure for the 'return_value' function.
*/
struct GetAllContext
{
/**
* Function to call.
*/
PluginKeyProcessor proc;
/**
* Closure for 'proc'.
*/
void *proc_cls;
};
/**
* Callback invoked to call callback on each value.
*
* @param cls the plugin
* @param key unused
* @param val the value
* @return GNUNET_OK (continue to iterate)
*/
static int
return_value (void *cls,
const struct GNUNET_HashCode *key,
void *val)
{
struct GetAllContext *gac = cls;
gac->proc (gac->proc_cls,
key,
1);
return GNUNET_OK;
}
/**
* Get all of the keys in the datastore.
*
* @param cls closure
* @param proc function to call on each key
* @param proc_cls closure for proc
*/
static void
heap_get_keys (void *cls,
PluginKeyProcessor proc,
void *proc_cls)
{
struct Plugin *plugin = cls;
struct GetAllContext gac;
gac.proc = proc;
gac.proc_cls = proc_cls;
GNUNET_CONTAINER_multihashmap_iterate (plugin->keyvalue,
&return_value,
&gac);
}
/**
* Entry point for the plugin.
*
* @param cls the "struct GNUNET_DATASTORE_PluginEnvironment*"
* @return our "struct Plugin*"
*/
void *
libgnunet_plugin_datastore_heap_init (void *cls)
{
struct GNUNET_DATASTORE_PluginEnvironment *env = cls;
struct GNUNET_DATASTORE_PluginFunctions *api;
struct Plugin *plugin;
unsigned long long esize;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (env->cfg,
"datastore-heap",
"HASHMAPSIZE",
&esize))
esize = 128 * 1024;
plugin = GNUNET_malloc (sizeof (struct Plugin));
plugin->env = env;
plugin->keyvalue = GNUNET_CONTAINER_multihashmap_create (esize, GNUNET_YES);
plugin->by_expiration = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
plugin->by_replication = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MAX);
api = GNUNET_malloc (sizeof (struct GNUNET_DATASTORE_PluginFunctions));
api->cls = plugin;
api->estimate_size = &heap_plugin_estimate_size;
api->put = &heap_plugin_put;
api->update = &heap_plugin_update;
api->get_key = &heap_plugin_get_key;
api->get_replication = &heap_plugin_get_replication;
api->get_expiration = &heap_plugin_get_expiration;
api->get_zero_anonymity = &heap_plugin_get_zero_anonymity;
api->drop = &heap_plugin_drop;
api->get_keys = &heap_get_keys;
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "heap",
_("Heap database running\n"));
return api;
}
/**
* Callback invoked to free all value.
*
* @param cls the plugin
* @param key unused
* @param val the value
* @return GNUNET_OK (continue to iterate)
*/
static int
free_value (void *cls,
const struct GNUNET_HashCode *key,
void *val)
{
struct Plugin *plugin = cls;
struct Value *value = val;
delete_value (plugin, value);
return GNUNET_OK;
}
/**
* Exit point from the plugin.
* @param cls our "struct Plugin*"
* @return always NULL
*/
void *
libgnunet_plugin_datastore_heap_done (void *cls)
{
struct GNUNET_DATASTORE_PluginFunctions *api = cls;
struct Plugin *plugin = api->cls;
GNUNET_CONTAINER_multihashmap_iterate (plugin->keyvalue,
&free_value,
plugin);
GNUNET_CONTAINER_multihashmap_destroy (plugin->keyvalue);
GNUNET_CONTAINER_heap_destroy (plugin->by_expiration);
GNUNET_CONTAINER_heap_destroy (plugin->by_replication);
GNUNET_free (plugin);
GNUNET_free (api);
return NULL;
}
/* end of plugin_datastore_heap.c */
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