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- /*
- This file is part of GNUnet.
- Copyright (C) 2009, 2010, 2012, 2014, 2016 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- 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
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file statistics/gnunet-service-statistics.c
- * @brief program that tracks statistics
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_bio_lib.h"
- #include "gnunet_container_lib.h"
- #include "gnunet_disk_lib.h"
- #include "gnunet_getopt_lib.h"
- #include "gnunet_protocols.h"
- #include "gnunet_service_lib.h"
- #include "gnunet_statistics_service.h"
- #include "gnunet_strings_lib.h"
- #include "gnunet_time_lib.h"
- #include "statistics.h"
- /**
- * Watch entry.
- */
- struct WatchEntry
- {
- /**
- * Watch entries are kept in a linked list.
- */
- struct WatchEntry *next;
- /**
- * Watch entries are kept in a linked list.
- */
- struct WatchEntry *prev;
- /**
- * For which client is this watch entry?
- */
- struct ClientEntry *ce;
- /**
- * Last value we communicated to the client for this watch entry.
- */
- uint64_t last_value;
- /**
- * Unique watch number for this client and this watched value.
- */
- uint32_t wid;
- /**
- * Is last_value valid
- * #GNUNET_NO : last_value is n/a, #GNUNET_YES: last_value is valid
- */
- int last_value_set;
- };
- /**
- * We keep the statistics organized by subsystem for faster
- * lookup during SET operations.
- */
- struct SubsystemEntry;
- /**
- * Entry in the statistics list.
- */
- struct StatsEntry
- {
- /**
- * This is a linked list.
- */
- struct StatsEntry *next;
- /**
- * This is a linked list.
- */
- struct StatsEntry *prev;
- /**
- * Subsystem this entry belongs to.
- */
- struct SubsystemEntry *subsystem;
- /**
- * Name for the value stored by this entry, allocated at the end of
- * this struct.
- */
- const char *name;
- /**
- * Watch context for changes to this value, or NULL for none.
- */
- struct WatchEntry *we_head;
- /**
- * Watch context for changes to this value, or NULL for none.
- */
- struct WatchEntry *we_tail;
- /**
- * Our value.
- */
- uint64_t value;
- /**
- * Unique ID.
- */
- uint32_t uid;
- /**
- * Is this value persistent?
- */
- int persistent;
- /**
- * Is this value set?
- * #GNUNET_NO: value is n/a, #GNUNET_YES: value is valid
- */
- int set;
- };
- /**
- * We keep the statistics organized by subsystem for faster
- * lookup during SET operations.
- */
- struct SubsystemEntry
- {
- /**
- * Subsystems are kept in a DLL.
- */
- struct SubsystemEntry *next;
- /**
- * Subsystems are kept in a DLL.
- */
- struct SubsystemEntry *prev;
- /**
- * Head of list of values kept for this subsystem.
- */
- struct StatsEntry *stat_head;
- /**
- * Tail of list of values kept for this subsystem.
- */
- struct StatsEntry *stat_tail;
- /**
- * Name of the subsystem this entry is for, allocated at
- * the end of this struct, do not free().
- */
- const char *service;
- };
- /**
- * Client entry.
- */
- struct ClientEntry
- {
- /**
- * Corresponding server handle.
- */
- struct GNUNET_SERVICE_Client *client;
- /**
- * Corresponding message queue.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Which subsystem is this client writing to (SET/UPDATE)?
- */
- struct SubsystemEntry *subsystem;
- /**
- * Maximum watch ID used by this client so far.
- */
- uint32_t max_wid;
- };
- /**
- * Our configuration.
- */
- static const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Head of linked list of subsystems with active statistics.
- */
- static struct SubsystemEntry *sub_head;
- /**
- * Tail of linked list of subsystems with active statistics.
- */
- static struct SubsystemEntry *sub_tail;
- /**
- * Number of connected clients.
- */
- static unsigned int client_count;
- /**
- * Our notification context.
- */
- static struct GNUNET_NotificationContext *nc;
- /**
- * Counter used to generate unique values.
- */
- static uint32_t uidgen;
- /**
- * Set to #GNUNET_YES if we are shutting down as soon as possible.
- */
- static int in_shutdown;
- /**
- * Write persistent statistics to disk.
- */
- static void
- save ()
- {
- struct SubsystemEntry *se;
- struct StatsEntry *pos;
- char *fn;
- struct GNUNET_BIO_WriteHandle *wh;
- uint16_t size;
- unsigned long long total;
- size_t nlen;
- size_t slen;
- struct GNUNET_STATISTICS_SetMessage *msg;
- if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg,
- "STATISTICS",
- "DATABASE",
- &fn))
- {
- GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
- "STATISTICS",
- "DATABASE");
- return;
- }
- (void) GNUNET_DISK_directory_create_for_file (fn);
- wh = GNUNET_BIO_write_open_file (fn);
- total = 0;
- while (NULL != (se = sub_head))
- {
- GNUNET_CONTAINER_DLL_remove (sub_head, sub_tail, se);
- slen = strlen (se->service) + 1;
- while (NULL != (pos = se->stat_head))
- {
- GNUNET_CONTAINER_DLL_remove (se->stat_head, se->stat_tail, pos);
- if ((pos->persistent) && (NULL != wh))
- {
- nlen = strlen (pos->name) + 1;
- size = sizeof(struct GNUNET_STATISTICS_SetMessage) + nlen + slen;
- GNUNET_assert (size < UINT16_MAX);
- msg = GNUNET_malloc (size);
- msg->header.size = htons ((uint16_t) size);
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_SET);
- GNUNET_assert (nlen + slen ==
- GNUNET_STRINGS_buffer_fill ((char *) &msg[1],
- nlen + slen,
- 2,
- se->service,
- pos->name));
- msg->flags =
- htonl (pos->persistent ? GNUNET_STATISTICS_SETFLAG_PERSISTENT : 0);
- msg->value = GNUNET_htonll (pos->value);
- if (GNUNET_OK != GNUNET_BIO_write (wh, "statistics-save-msg", msg, size))
- {
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "write", fn);
- if (GNUNET_OK != GNUNET_BIO_write_close (wh, NULL))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "close", fn);
- wh = NULL;
- }
- else
- {
- total += size;
- }
- GNUNET_free (msg);
- }
- GNUNET_free (pos);
- }
- GNUNET_free (se);
- }
- if (NULL != wh)
- {
- if (GNUNET_OK != GNUNET_BIO_write_close (wh, NULL))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "close", fn);
- if (0 == total)
- GNUNET_break (0 == unlink (fn));
- else
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _ ("Wrote %llu bytes of statistics to `%s'\n"),
- total,
- fn);
- }
- GNUNET_free_non_null (fn);
- }
- /**
- * Transmit the given stats value.
- *
- * @param client receiver of the value
- * @param e value to transmit
- */
- static void
- transmit (struct ClientEntry *ce, const struct StatsEntry *e)
- {
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_STATISTICS_ReplyMessage *m;
- size_t size;
- size = strlen (e->subsystem->service) + 1 + strlen (e->name) + 1;
- GNUNET_assert (size < GNUNET_MAX_MESSAGE_SIZE);
- env = GNUNET_MQ_msg_extra (m, size, GNUNET_MESSAGE_TYPE_STATISTICS_VALUE);
- m->uid = htonl (e->uid);
- if (e->persistent)
- m->uid |= htonl (GNUNET_STATISTICS_PERSIST_BIT);
- m->value = GNUNET_htonll (e->value);
- GNUNET_assert (size == GNUNET_STRINGS_buffer_fill ((char *) &m[1],
- size,
- 2,
- e->subsystem->service,
- e->name));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting value for `%s:%s' (%d): %llu\n",
- e->subsystem->service,
- e->name,
- e->persistent,
- (unsigned long long) e->value);
- GNUNET_MQ_send (ce->mq, env);
- }
- /**
- * Callback called when a client connects to the service.
- *
- * @param cls closure for the service
- * @param c the new client that connected to the service
- * @param mq the message queue used to send messages to the client
- * @return @a c
- */
- static void *
- client_connect_cb (void *cls,
- struct GNUNET_SERVICE_Client *c,
- struct GNUNET_MQ_Handle *mq)
- {
- struct ClientEntry *ce;
- ce = GNUNET_new (struct ClientEntry);
- ce->client = c;
- ce->mq = mq;
- client_count++;
- GNUNET_notification_context_add (nc, mq);
- return ce;
- }
- /**
- * Check integrity of GET-message.
- *
- * @param cls identification of the client
- * @param message the actual message
- * @return #GNUNET_OK if @a message is well-formed
- */
- static int
- check_get (void *cls, const struct GNUNET_MessageHeader *message)
- {
- const char *service;
- const char *name;
- size_t size;
- size = ntohs (message->size) - sizeof(struct GNUNET_MessageHeader);
- if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &message[1],
- size,
- 2,
- &service,
- &name))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Handle GET-message.
- *
- * @param cls identification of the client
- * @param message the actual message
- */
- static void
- handle_get (void *cls, const struct GNUNET_MessageHeader *message)
- {
- struct ClientEntry *ce = cls;
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_MessageHeader *end;
- const char *service;
- const char *name;
- size_t slen;
- size_t nlen;
- struct SubsystemEntry *se;
- struct StatsEntry *pos;
- size_t size;
- size = ntohs (message->size) - sizeof(struct GNUNET_MessageHeader);
- GNUNET_assert (size ==
- GNUNET_STRINGS_buffer_tokenize ((const char *) &message[1],
- size,
- 2,
- &service,
- &name));
- slen = strlen (service);
- nlen = strlen (name);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received request for statistics on `%s:%s'\n",
- slen ? service : "*",
- nlen ? name : "*");
- for (se = sub_head; NULL != se; se = se->next)
- {
- if (! ((0 == slen) || (0 == strcmp (service, se->service))))
- continue;
- for (pos = se->stat_head; NULL != pos; pos = pos->next)
- {
- if (! ((0 == nlen) || (0 == strcmp (name, pos->name))))
- continue;
- transmit (ce, pos);
- }
- }
- env = GNUNET_MQ_msg (end, GNUNET_MESSAGE_TYPE_STATISTICS_END);
- GNUNET_MQ_send (ce->mq, env);
- GNUNET_SERVICE_client_continue (ce->client);
- }
- /**
- * Notify all clients listening about a change to a value.
- *
- * @param se value that changed
- */
- static void
- notify_change (struct StatsEntry *se)
- {
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_STATISTICS_WatchValueMessage *wvm;
- struct WatchEntry *pos;
- for (pos = se->we_head; NULL != pos; pos = pos->next)
- {
- if (GNUNET_YES == pos->last_value_set)
- {
- if (pos->last_value == se->value)
- continue;
- }
- else
- {
- pos->last_value_set = GNUNET_YES;
- }
- env = GNUNET_MQ_msg (wvm, GNUNET_MESSAGE_TYPE_STATISTICS_WATCH_VALUE);
- wvm->flags =
- htonl (se->persistent ? GNUNET_STATISTICS_SETFLAG_PERSISTENT : 0);
- wvm->wid = htonl (pos->wid);
- wvm->reserved = htonl (0);
- wvm->value = GNUNET_htonll (se->value);
- GNUNET_MQ_send (pos->ce->mq, env);
- pos->last_value = se->value;
- }
- }
- /**
- * Find the subsystem entry of the given name for the specified client.
- *
- * @param ce client looking for the subsystem, may contain a hint
- * to find the entry faster, can be NULL
- * @param service name of the subsystem to look for
- * @return subsystem entry, never NULL (subsystem entry is created if necessary)
- */
- static struct SubsystemEntry *
- find_subsystem_entry (struct ClientEntry *ce, const char *service)
- {
- size_t slen;
- struct SubsystemEntry *se;
- if (NULL != ce)
- se = ce->subsystem;
- else
- se = NULL;
- if ((NULL == se) || (0 != strcmp (service, se->service)))
- {
- for (se = sub_head; NULL != se; se = se->next)
- if (0 == strcmp (service, se->service))
- break;
- if (NULL != ce)
- ce->subsystem = se;
- }
- if (NULL != se)
- return se;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Allocating new subsystem entry `%s'\n",
- service);
- slen = strlen (service) + 1;
- se = GNUNET_malloc (sizeof(struct SubsystemEntry) + slen);
- GNUNET_memcpy (&se[1], service, slen);
- se->service = (const char *) &se[1];
- GNUNET_CONTAINER_DLL_insert (sub_head, sub_tail, se);
- if (NULL != ce)
- ce->subsystem = se;
- return se;
- }
- /**
- * Find the statistics entry of the given subsystem.
- *
- * @param subsystem subsystem to look in
- * @param name name of the entry to look for
- * @return statistis entry, or NULL if not found
- */
- static struct StatsEntry *
- find_stat_entry (struct SubsystemEntry *se, const char *name)
- {
- struct StatsEntry *pos;
- for (pos = se->stat_head; NULL != pos; pos = pos->next)
- if (0 == strcmp (name, pos->name))
- return pos;
- return NULL;
- }
- /**
- * Check format of SET-message.
- *
- * @param cls the `struct ClientEntry`
- * @param message the actual message
- * @return #GNUNET_OK if message is well-formed
- */
- static int
- check_set (void *cls, const struct GNUNET_STATISTICS_SetMessage *msg)
- {
- const char *service;
- const char *name;
- size_t msize;
- msize = ntohs (msg->header.size) - sizeof(*msg);
- if (msize != GNUNET_STRINGS_buffer_tokenize ((const char *) &msg[1],
- msize,
- 2,
- &service,
- &name))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Handle SET-message.
- *
- * @param cls the `struct ClientEntry`
- * @param message the actual message
- */
- static void
- handle_set (void *cls, const struct GNUNET_STATISTICS_SetMessage *msg)
- {
- struct ClientEntry *ce = cls;
- const char *service;
- const char *name;
- size_t nlen;
- uint16_t msize;
- uint16_t size;
- struct SubsystemEntry *se;
- struct StatsEntry *pos;
- uint32_t flags;
- uint64_t value;
- int64_t delta;
- int changed;
- int initial_set;
- msize = ntohs (msg->header.size);
- size = msize - sizeof(struct GNUNET_STATISTICS_SetMessage);
- GNUNET_assert (size == GNUNET_STRINGS_buffer_tokenize ((const char *) &msg[1],
- size,
- 2,
- &service,
- &name));
- se = find_subsystem_entry (ce, service);
- flags = ntohl (msg->flags);
- value = GNUNET_ntohll (msg->value);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received request to update statistic on `%s:%s' (%u) to/by %llu\n",
- service,
- name,
- (unsigned int) flags,
- (unsigned long long) value);
- pos = find_stat_entry (se, name);
- if (NULL != pos)
- {
- initial_set = 0;
- if (0 == (flags & GNUNET_STATISTICS_SETFLAG_RELATIVE))
- {
- changed = (pos->value != value);
- pos->value = value;
- }
- else
- {
- delta = (int64_t) value;
- if ((delta < 0) && (pos->value < -delta))
- {
- changed = (0 != pos->value);
- pos->value = 0;
- }
- else
- {
- changed = (0 != delta);
- GNUNET_break ((delta <= 0) || (pos->value + delta > pos->value));
- pos->value += delta;
- }
- }
- if (GNUNET_NO == pos->set)
- {
- pos->set = GNUNET_YES;
- initial_set = 1;
- }
- pos->persistent = (0 != (flags & GNUNET_STATISTICS_SETFLAG_PERSISTENT));
- if (pos != se->stat_head)
- {
- /* move to front for faster setting next time! */
- GNUNET_CONTAINER_DLL_remove (se->stat_head, se->stat_tail, pos);
- GNUNET_CONTAINER_DLL_insert (se->stat_head, se->stat_tail, pos);
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Statistic `%s:%s' updated to value %llu (%d).\n",
- service,
- name,
- (unsigned long long) pos->value,
- pos->persistent);
- if ((changed) || (1 == initial_set))
- notify_change (pos);
- GNUNET_SERVICE_client_continue (ce->client);
- return;
- }
- /* not found, create a new entry */
- nlen = strlen (name) + 1;
- pos = GNUNET_malloc (sizeof(struct StatsEntry) + nlen);
- GNUNET_memcpy (&pos[1], name, nlen);
- pos->name = (const char *) &pos[1];
- pos->subsystem = se;
- if ((0 == (flags & GNUNET_STATISTICS_SETFLAG_RELATIVE)) ||
- (0 < (int64_t) GNUNET_ntohll (msg->value)))
- {
- pos->value = GNUNET_ntohll (msg->value);
- pos->set = GNUNET_YES;
- }
- else
- {
- pos->set = GNUNET_NO;
- }
- pos->uid = uidgen++;
- pos->persistent = (0 != (flags & GNUNET_STATISTICS_SETFLAG_PERSISTENT));
- GNUNET_CONTAINER_DLL_insert (se->stat_head, se->stat_tail, pos);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "New statistic on `%s:%s' with value %llu created.\n",
- service,
- name,
- (unsigned long long) pos->value);
- if (NULL != ce)
- GNUNET_SERVICE_client_continue (ce->client);
- }
- /**
- * Check integrity of WATCH-message.
- *
- * @param cls the `struct ClientEntry *`
- * @param message the actual message
- * @return #GNUNET_OK if message is well-formed
- */
- static int
- check_watch (void *cls, const struct GNUNET_MessageHeader *message)
- {
- size_t size;
- const char *service;
- const char *name;
- size = ntohs (message->size) - sizeof(struct GNUNET_MessageHeader);
- if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &message[1],
- size,
- 2,
- &service,
- &name))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Handle WATCH-message.
- *
- * @param cls the `struct ClientEntry *`
- * @param message the actual message
- */
- static void
- handle_watch (void *cls, const struct GNUNET_MessageHeader *message)
- {
- struct ClientEntry *ce = cls;
- const char *service;
- const char *name;
- uint16_t msize;
- uint16_t size;
- struct SubsystemEntry *se;
- struct StatsEntry *pos;
- struct WatchEntry *we;
- size_t nlen;
- if (NULL == nc)
- {
- GNUNET_SERVICE_client_drop (ce->client);
- return;
- }
- GNUNET_SERVICE_client_mark_monitor (ce->client);
- msize = ntohs (message->size);
- size = msize - sizeof(struct GNUNET_MessageHeader);
- GNUNET_assert (size ==
- GNUNET_STRINGS_buffer_tokenize ((const char *) &message[1],
- size,
- 2,
- &service,
- &name));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received request to watch statistic on `%s:%s'\n",
- service,
- name);
- se = find_subsystem_entry (ce, service);
- pos = find_stat_entry (se, name);
- if (NULL == pos)
- {
- nlen = strlen (name) + 1;
- pos = GNUNET_malloc (sizeof(struct StatsEntry) + nlen);
- GNUNET_memcpy (&pos[1], name, nlen);
- pos->name = (const char *) &pos[1];
- pos->subsystem = se;
- GNUNET_CONTAINER_DLL_insert (se->stat_head, se->stat_tail, pos);
- pos->uid = uidgen++;
- pos->set = GNUNET_NO;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "New statistic on `%s:%s' with value %llu created.\n",
- service,
- name,
- (unsigned long long) pos->value);
- }
- we = GNUNET_new (struct WatchEntry);
- we->ce = ce;
- we->last_value_set = GNUNET_NO;
- we->wid = ce->max_wid++;
- GNUNET_CONTAINER_DLL_insert (pos->we_head, pos->we_tail, we);
- if (0 != pos->value)
- notify_change (pos);
- GNUNET_SERVICE_client_continue (ce->client);
- }
- /**
- * Handle DISCONNECT-message. Sync to disk and send
- * back a #GNUNET_MESSAGE_TYPE_STATISTICS_DISCONNECT_CONFIRM
- * message.
- *
- * @param cls the `struct ClientEntry *`
- * @param message the actual message
- */
- static void
- handle_disconnect (void *cls, const struct GNUNET_MessageHeader *message)
- {
- struct ClientEntry *ce = cls;
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_MessageHeader *msg;
- env = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_STATISTICS_DISCONNECT_CONFIRM);
- GNUNET_MQ_send (ce->mq, env);
- GNUNET_SERVICE_client_continue (ce->client);
- }
- /**
- * Actually perform the shutdown.
- */
- static void
- do_shutdown ()
- {
- struct WatchEntry *we;
- struct StatsEntry *pos;
- struct SubsystemEntry *se;
- if (NULL == nc)
- return;
- save ();
- GNUNET_notification_context_destroy (nc);
- nc = NULL;
- GNUNET_assert (0 == client_count);
- while (NULL != (se = sub_head))
- {
- GNUNET_CONTAINER_DLL_remove (sub_head, sub_tail, se);
- while (NULL != (pos = se->stat_head))
- {
- GNUNET_CONTAINER_DLL_remove (se->stat_head, se->stat_tail, pos);
- while (NULL != (we = pos->we_head))
- {
- GNUNET_break (0);
- GNUNET_CONTAINER_DLL_remove (pos->we_head, pos->we_tail, we);
- GNUNET_free (we);
- }
- GNUNET_free (pos);
- }
- GNUNET_free (se);
- }
- }
- /**
- * Task run during shutdown.
- *
- * @param cls unused
- */
- static void
- shutdown_task (void *cls)
- {
- in_shutdown = GNUNET_YES;
- if (0 != client_count)
- return;
- do_shutdown ();
- }
- /**
- * A client disconnected. Remove all of its data structure entries.
- *
- * @param cls closure, NULL
- * @param client identification of the client
- * @param app_cls the `struct ClientEntry *`
- */
- static void
- client_disconnect_cb (void *cls,
- struct GNUNET_SERVICE_Client *client,
- void *app_cls)
- {
- struct ClientEntry *ce = app_cls;
- struct WatchEntry *we;
- struct WatchEntry *wen;
- struct StatsEntry *pos;
- struct SubsystemEntry *se;
- client_count--;
- for (se = sub_head; NULL != se; se = se->next)
- {
- for (pos = se->stat_head; NULL != pos; pos = pos->next)
- {
- wen = pos->we_head;
- while (NULL != (we = wen))
- {
- wen = we->next;
- if (we->ce != ce)
- continue;
- GNUNET_CONTAINER_DLL_remove (pos->we_head, pos->we_tail, we);
- GNUNET_free (we);
- }
- }
- }
- GNUNET_free (ce);
- if ((0 == client_count) && (GNUNET_YES == in_shutdown))
- do_shutdown ();
- }
- /**
- * We've read a `struct GNUNET_STATISTICS_SetMessage *` from
- * disk. Check that it is well-formed, and if so pass it to
- * the handler for set messages.
- *
- * @param cls NULL
- * @param message the message found on disk
- * @return #GNUNET_OK on success,
- * #GNUNET_NO to stop further processing (no error)
- * #GNUNET_SYSERR to stop further processing with error
- */
- static int
- inject_message (void *cls, const struct GNUNET_MessageHeader *message)
- {
- uint16_t msize = ntohs (message->size);
- const struct GNUNET_STATISTICS_SetMessage *sm;
- sm = (const struct GNUNET_STATISTICS_SetMessage *) message;
- if ((sizeof(struct GNUNET_STATISTICS_SetMessage) > msize) ||
- (GNUNET_OK != check_set (NULL, sm)))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- handle_set (NULL, sm);
- return GNUNET_OK;
- }
- /**
- * Load persistent values from disk. Disk format is exactly the same
- * format that we also use for setting the values over the network.
- */
- static void
- load ()
- {
- char *fn;
- struct GNUNET_BIO_ReadHandle *rh;
- uint64_t fsize;
- char *buf;
- struct GNUNET_MessageStreamTokenizer *mst;
- if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg,
- "STATISTICS",
- "DATABASE",
- &fn))
- {
- GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
- "STATISTICS",
- "DATABASE");
- return;
- }
- if ((GNUNET_OK !=
- GNUNET_DISK_file_size (fn, &fsize, GNUNET_NO, GNUNET_YES)) ||
- (0 == fsize))
- {
- GNUNET_free (fn);
- return;
- }
- buf = GNUNET_malloc (fsize);
- rh = GNUNET_BIO_read_open_file (fn);
- if (! rh)
- {
- GNUNET_free (buf);
- GNUNET_free (fn);
- return;
- }
- if (GNUNET_OK != GNUNET_BIO_read (rh, fn, buf, fsize))
- {
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "read", fn);
- GNUNET_break (GNUNET_OK == GNUNET_BIO_read_close (rh, NULL));
- GNUNET_free (buf);
- GNUNET_free (fn);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _ ("Loading %llu bytes of statistics from `%s'\n"),
- (unsigned long long) fsize,
- fn);
- mst = GNUNET_MST_create (&inject_message, NULL);
- GNUNET_break (
- GNUNET_OK ==
- GNUNET_MST_from_buffer (mst, buf, (size_t) fsize, GNUNET_YES, GNUNET_NO));
- GNUNET_MST_destroy (mst);
- GNUNET_free (buf);
- GNUNET_break (GNUNET_OK == GNUNET_BIO_read_close (rh, NULL));
- GNUNET_free (fn);
- }
- /**
- * Process statistics requests.
- *
- * @param cls closure
- * @param c configuration to use
- * @param service the initialized service
- */
- static void
- run (void *cls,
- const struct GNUNET_CONFIGURATION_Handle *c,
- struct GNUNET_SERVICE_Handle *service)
- {
- cfg = c;
- nc = GNUNET_notification_context_create (16);
- load ();
- GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
- }
- /**
- * Define "main" method using service macro.
- */
- GNUNET_SERVICE_MAIN (
- "statistics",
- GNUNET_SERVICE_OPTION_SOFT_SHUTDOWN,
- &run,
- &client_connect_cb,
- &client_disconnect_cb,
- NULL,
- GNUNET_MQ_hd_var_size (set,
- GNUNET_MESSAGE_TYPE_STATISTICS_SET,
- struct GNUNET_STATISTICS_SetMessage,
- NULL),
- GNUNET_MQ_hd_var_size (get,
- GNUNET_MESSAGE_TYPE_STATISTICS_GET,
- struct GNUNET_MessageHeader,
- NULL),
- GNUNET_MQ_hd_var_size (watch,
- GNUNET_MESSAGE_TYPE_STATISTICS_WATCH,
- struct GNUNET_MessageHeader,
- NULL),
- GNUNET_MQ_hd_fixed_size (disconnect,
- GNUNET_MESSAGE_TYPE_STATISTICS_DISCONNECT,
- struct GNUNET_MessageHeader,
- NULL),
- GNUNET_MQ_handler_end ());
- #if defined(__linux__) && defined(__GLIBC__)
- #include <malloc.h>
- /**
- * MINIMIZE heap size (way below 128k) since this process doesn't need much.
- */
- void __attribute__ ((constructor))
- GNUNET_STATISTICS_memory_init ()
- {
- mallopt (M_TRIM_THRESHOLD, 4 * 1024);
- mallopt (M_TOP_PAD, 1 * 1024);
- malloc_trim (0);
- }
- #endif
- /* end of gnunet-service-statistics.c */
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