/*
This file is part of GNUnet.
- (C) 2009 Christian Grothoff (and other contributing authors)
+ (C) 2009, 2010, 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 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 statistics/gnunet-service-statistics.c
* @brief program that tracks statistics
* @author Christian Grothoff
- *
- * TODO:
- * - use BIO for IO operations
*/
#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_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 GNUNET_SERVER_Client *client;
+
+ /**
+ * 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;
+
+};
+
+
+/**
+ * Client entry.
+ */
+struct ClientEntry
+{
+ /**
+ * Clients are kept in a linked list.
+ */
+ struct ClientEntry *next;
+
+ /**
+ * Clients are kept in a linked list.
+ */
+ struct ClientEntry *prev;
+
+ /**
+ * Corresponding server handle.
+ */
+ struct GNUNET_SERVER_Client *client;
+
+ /**
+ * Maximum watch ID used by this client so far.
+ */
+ uint32_t max_wid;
+
+};
+
/**
* Entry in the statistics list.
*/
*/
struct GNUNET_STATISTICS_SetMessage *msg;
+ /**
+ * 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.
*/
*/
int persistent;
+ /**
+ * Is this value set?
+ * GNUNET_NO : value is n/a, GNUNET_YES: value is valid
+ */
+ int set;
+
};
/**
*/
static struct StatsEntry *start;
+/**
+ * Head of linked list of connected clients.
+ */
+static struct ClientEntry *client_head;
+
+/**
+ * Tail of linked list of connected clients.
+ */
+static struct ClientEntry *client_tail;
+
+/**
+ * Handle to our server.
+ */
+static struct GNUNET_SERVER_Handle *srv;
+
+/**
+ * Our notification context.
+ */
+static struct GNUNET_SERVER_NotificationContext *nc;
+
/**
* Counter used to generate unique values.
*/
static uint32_t uidgen;
+/**
+ * Set to YES if we are shutting down as soon as possible.
+ */
+static int in_shutdown;
+
+
+/**
+ * Inject a message to our server with a client of 'NULL'.
+ *
+ * @param cls the 'struct GNUNET_SERVER_Handle'
+ * @param client unused
+ * @param msg message to inject
+ */
+static int
+inject_message (void *cls, void *client, const struct GNUNET_MessageHeader *msg)
+{
+ struct GNUNET_SERVER_Handle *server = cls;
+
+ GNUNET_break (GNUNET_OK == GNUNET_SERVER_inject (server, NULL, msg));
+ return GNUNET_OK;
+}
+
+
/**
* Load persistent values from disk. Disk format is
* exactly the same format that we also use for
load (struct GNUNET_SERVER_Handle *server)
{
char *fn;
- struct GNUNET_DISK_FileHandle *fh;
- struct GNUNET_DISK_MapHandle *mh;
- struct stat sb;
+ struct GNUNET_BIO_ReadHandle *rh;
+ uint64_t fsize;
char *buf;
- size_t off;
- const struct GNUNET_MessageHeader *msg;
-
- fn = GNUNET_DISK_get_home_filename (cfg,
- "statistics", "statistics.data", NULL);
- if (fn == NULL)
+ struct GNUNET_SERVER_MessageStreamTokenizer *mst;
+ char *emsg;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (cfg,
+ "STATISTICS",
+ "DATABASE",
+ &fn))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "STATISTICS",
+ "DATABASE");
return;
- if ((0 != stat (fn, &sb)) || (sb.st_size == 0))
- {
- GNUNET_free (fn);
- return;
- }
- fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_READ,
- GNUNET_DISK_PERM_NONE);
- if (!fh)
- {
- GNUNET_free (fn);
- return;
- }
- buf = GNUNET_DISK_file_map (fh, &mh, GNUNET_DISK_MAP_TYPE_READ, sb.st_size);
- if (NULL == buf)
- {
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "mmap", fn);
- GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
- GNUNET_free (fn);
- 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 (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, &emsg));
+ GNUNET_free (buf);
+ GNUNET_free_non_null (emsg);
+ GNUNET_free (fn);
+ return;
+ }
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("Loading %llu bytes of statistics from `%s'\n"),
- (unsigned long long) sb.st_size, fn);
- off = 0;
- while (off + sizeof (struct GNUNET_MessageHeader) < sb.st_size)
- {
- msg = (const struct GNUNET_MessageHeader *) &buf[off];
- if ((ntohs (msg->size) + off > sb.st_size) ||
- (GNUNET_OK != GNUNET_SERVER_inject (server, NULL, msg)))
- {
- GNUNET_break (0);
- break;
- }
- off += ntohs (msg->size);
- }
- GNUNET_break (GNUNET_OK == GNUNET_DISK_file_unmap (mh));
- GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
+ fsize, fn);
+ mst = GNUNET_SERVER_mst_create (&inject_message, server);
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_SERVER_mst_receive (mst, NULL, buf, fsize,
+ GNUNET_YES, GNUNET_NO));
+ GNUNET_SERVER_mst_destroy (mst);
+ GNUNET_free (buf);
+ GNUNET_break (GNUNET_OK == GNUNET_BIO_read_close (rh, &emsg));
+ GNUNET_free_non_null (emsg);
GNUNET_free (fn);
}
+
/**
* Write persistent statistics to disk.
*/
static void
-save ()
+save ()
{
struct StatsEntry *pos;
char *fn;
- struct GNUNET_DISK_FileHandle *fh;
+ struct GNUNET_BIO_WriteHandle *wh;
uint16_t size;
unsigned long long total;
- fh = NULL;
- fn = GNUNET_DISK_get_home_filename (cfg,
- "statistics", "statistics.data", NULL);
- if (fn != NULL)
- fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_WRITE
- | GNUNET_DISK_OPEN_CREATE | GNUNET_DISK_OPEN_TRUNCATE,
- GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
+ 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 (fn);
total = 0;
while (NULL != (pos = start))
+ {
+ start = pos->next;
+ if ((pos->persistent) && (NULL != wh))
{
- start = pos->next;
- if ((pos->persistent) && (NULL != fh))
- {
- size = htons (pos->msg->header.size);
- if (size != GNUNET_DISK_file_write (fh, pos->msg, size))
- {
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
- "write", fn);
- GNUNET_DISK_file_close (fh);
- fh = NULL;
- }
- else
- total += size;
- }
- GNUNET_free (pos);
- }
- if (NULL != fh)
- {
- GNUNET_DISK_file_close (fh);
- if (total == 0)
- GNUNET_break (0 == UNLINK (fn));
+ size = htons (pos->msg->header.size);
+ if (GNUNET_OK != GNUNET_BIO_write (wh, pos->msg, size))
+ {
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "write", fn);
+ if (GNUNET_OK != GNUNET_BIO_write_close (wh))
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "close", fn);
+ wh = NULL;
+ }
else
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Wrote %llu bytes of statistics to `%s'\n"), total, fn);
+ total += size;
}
+ GNUNET_free (pos);
+ }
+ if (NULL != wh)
+ {
+ if (GNUNET_OK != GNUNET_BIO_write_close (wh))
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "close", fn);
+ if (total == 0)
+ 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 GNUNET_SERVER_TransmitContext *tc,
- const struct StatsEntry *e)
+transmit (struct GNUNET_SERVER_Client *client, const struct StatsEntry *e)
{
struct GNUNET_STATISTICS_ReplyMessage *m;
- struct GNUNET_MessageHeader *h;
size_t size;
- uint16_t msize;
size =
- sizeof (struct GNUNET_STATISTICS_ReplyMessage) + strlen (e->service) + 1 +
- strlen (e->name) + 1;
+ sizeof (struct GNUNET_STATISTICS_ReplyMessage) + strlen (e->service) + 1 +
+ strlen (e->name) + 1;
GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
- msize = size - sizeof (struct GNUNET_MessageHeader);
m = GNUNET_malloc (size);
+ m->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_VALUE);
+ m->header.size = htons (size);
m->uid = htonl (e->uid);
if (e->persistent)
m->uid |= htonl (GNUNET_STATISTICS_PERSIST_BIT);
m->value = GNUNET_htonll (e->value);
size -= sizeof (struct GNUNET_STATISTICS_ReplyMessage);
- GNUNET_assert (size == GNUNET_STRINGS_buffer_fill ((char *) &m[1],
- size,
- 2, e->service, e->name));
-#if DEBUG_STATISTICS
+ GNUNET_assert (size ==
+ GNUNET_STRINGS_buffer_fill ((char *) &m[1], size, 2,
+ e->service, e->name));
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting value for `%s:%s': %llu\n",
- e->service, e->name, e->value);
-#endif
- h = &m->header;
- GNUNET_SERVER_transmit_context_append (tc,
- &h[1],
- msize,
- GNUNET_MESSAGE_TYPE_STATISTICS_VALUE);
+ "Transmitting value for `%s:%s' (%d): %llu\n", e->service,
+ e->name, e->persistent, e->value);
+ GNUNET_SERVER_notification_context_unicast (nc, client, &m->header,
+ GNUNET_NO);
GNUNET_free (m);
}
/**
* Does this entry match the request?
+ *
+ * @param e an entry
+ * @param service name of service to match
+ * @param name value to match
+ * @return 1 if they match, 0 if not
*/
static int
matches (const struct StatsEntry *e, const char *service, const char *name)
{
- return ((0 == strlen (service)) ||
- (0 == strcmp (service, e->service)))
- && ((0 == strlen (name)) || (0 == strcmp (name, e->name)));
+ return ((0 == strlen (service)) || (0 == strcmp (service, e->service))) &&
+ ((0 == strlen (name)) || (0 == strcmp (name, e->name)));
+}
+
+
+/**
+ * Find a client entry for the given client handle, or create one.
+ *
+ * @param client handle to match
+ * @return corresponding client entry struct
+ */
+static struct ClientEntry *
+make_client_entry (struct GNUNET_SERVER_Client *client)
+{
+ struct ClientEntry *ce;
+
+ GNUNET_assert (client != NULL);
+ ce = client_head;
+ while (ce != NULL)
+ {
+ if (ce->client == client)
+ return ce;
+ ce = ce->next;
+ }
+ if (NULL == nc)
+ {
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return NULL;
+ }
+ ce = GNUNET_new (struct ClientEntry);
+ ce->client = client;
+ GNUNET_CONTAINER_DLL_insert (client_head, client_tail, ce);
+ GNUNET_SERVER_notification_context_add (nc, client);
+ return ce;
}
* GNUNET_SYSERR to close it (signal serious error)
*/
static void
-handle_get (void *cls,
- struct GNUNET_SERVER_Client *client,
+handle_get (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
+ struct GNUNET_MessageHeader end;
char *service;
char *name;
struct StatsEntry *pos;
- struct GNUNET_SERVER_TransmitContext *tc;
size_t size;
+ if ( (NULL != client) &&
+ (NULL == make_client_entry (client)) )
+ return; /* new client during shutdown */
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);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-#if DEBUG_STATISTICS
+ if (size !=
+ GNUNET_STRINGS_buffer_tokenize ((const char *) &message[1], size, 2,
+ &service, &name))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received request for statistics on `%s:%s'\n",
strlen (service) ? service : "*", strlen (name) ? name : "*");
-#endif
- tc = GNUNET_SERVER_transmit_context_create (client);
- pos = start;
- while (pos != NULL)
+ for (pos = start; NULL != pos; pos = pos->next)
+ if (matches (pos, service, name))
+ transmit (client, pos);
+ end.size = htons (sizeof (struct GNUNET_MessageHeader));
+ end.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_END);
+ GNUNET_SERVER_notification_context_unicast (nc, client, &end, GNUNET_NO);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Notify all clients listening about a change to a value.
+ *
+ * @param se value that changed
+ */
+static void
+notify_change (struct StatsEntry *se)
+{
+ 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 (matches (pos, service, name))
- transmit (tc, pos);
- pos = pos->next;
+ if (pos->last_value == se->value)
+ continue;
}
- GNUNET_SERVER_transmit_context_append (tc, NULL, 0,
- GNUNET_MESSAGE_TYPE_STATISTICS_END);
- GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
+ else
+ {
+ pos->last_value_set = GNUNET_YES;
+ }
+ wvm.header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_WATCH_VALUE);
+ wvm.header.size =
+ htons (sizeof (struct GNUNET_STATISTICS_WatchValueMessage));
+ wvm.flags = htonl (se->persistent ? GNUNET_STATISTICS_PERSIST_BIT : 0);
+ wvm.wid = htonl (pos->wid);
+ wvm.reserved = htonl (0);
+ wvm.value = GNUNET_htonll (se->value);
+ GNUNET_SERVER_notification_context_unicast (nc, pos->client, &wvm.header,
+ GNUNET_NO);
+ pos->last_value = se->value;
+ }
}
* @param message the actual message
*/
static void
-handle_set (void *cls,
- struct GNUNET_SERVER_Client *client,
+handle_set (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
char *service;
uint32_t flags;
uint64_t value;
int64_t delta;
+ int changed;
+ int initial_set;
+ if ( (NULL != client) &&
+ (NULL == make_client_entry (client)) )
+ return; /* new client during shutdown */
msize = ntohs (message->size);
if (msize < sizeof (struct GNUNET_STATISTICS_SetMessage))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
size = msize - sizeof (struct GNUNET_STATISTICS_SetMessage);
msg = (const struct GNUNET_STATISTICS_SetMessage *) message;
- if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &msg[1],
- size, 2, &service, &name))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received request to update statistic on `%s:%s'\n",
- service, name);
-#endif
+ if (size !=
+ GNUNET_STRINGS_buffer_tokenize ((const char *) &msg[1], size, 2, &service,
+ &name))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
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 = start;
prev = NULL;
while (pos != NULL)
+ {
+ if (matches (pos, service, name))
{
- if (matches (pos, service, name))
+ initial_set = 0;
+ if ((flags & GNUNET_STATISTICS_SETFLAG_RELATIVE) == 0)
+ {
+ changed = (pos->value != value);
+ pos->value = value;
+ }
+ else
+ {
+ delta = (int64_t) value;
+ if ((delta < 0) && (pos->value < -delta))
{
- if ((flags & GNUNET_STATISTICS_SETFLAG_RELATIVE) == 0)
- {
- pos->value = value;
- }
- else
- {
- delta = (int64_t) value;
- if ((delta < 0) && (pos->value < -delta))
- {
- pos->value = 0;
- }
- else
- {
- GNUNET_break ((delta <= 0) ||
- (pos->value + delta > pos->value));
- pos->value += delta;
- }
- }
- pos->msg->value = GNUNET_htonll (pos->value);
- pos->msg->flags = msg->flags;
- pos->persistent =
- (0 != (flags & GNUNET_STATISTICS_SETFLAG_PERSISTENT));
- if (prev != NULL)
- {
- /* move to front for faster setting next time! */
- prev->next = pos->next;
- pos->next = start;
- start = pos;
- }
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Statistic `%s:%s' updated to value %llu.\n",
- service, name, pos->value);
-#endif
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
+ changed = (pos->value != 0);
+ pos->value = 0;
+ }
+ else
+ {
+ changed = (delta != 0);
+ GNUNET_break ((delta <= 0) || (pos->value + delta > pos->value));
+ pos->value += delta;
}
- prev = pos;
- pos = pos->next;
+ }
+ if (GNUNET_NO == pos->set)
+ {
+ pos->set = GNUNET_YES;
+ initial_set = 1;
+ }
+ pos->msg->value = GNUNET_htonll (pos->value);
+ pos->msg->flags = msg->flags;
+ pos->persistent = (0 != (flags & GNUNET_STATISTICS_SETFLAG_PERSISTENT));
+ if (prev != NULL)
+ {
+ /* move to front for faster setting next time! */
+ prev->next = pos->next;
+ pos->next = start;
+ start = pos;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Statistic `%s:%s' updated to value %llu.\n", service, name,
+ pos->value);
+ if ((changed) || (1 == initial_set))
+ notify_change (pos);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
}
+ prev = pos;
+ pos = pos->next;
+ }
pos = GNUNET_malloc (sizeof (struct StatsEntry) + msize);
pos->next = start;
if (((flags & GNUNET_STATISTICS_SETFLAG_RELATIVE) == 0) ||
(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));
pos->msg = (void *) &pos[1];
pos->name = &pos->service[strlen (pos->service) + 1];
start = pos;
-#if DEBUG_STATISTICS
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "New statistic on `%s:%s' with value %llu created.\n",
- service, name, pos->value);
-#endif
+ "New statistic on `%s:%s' with value %llu created.\n", service,
+ name, pos->value);
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
/**
- * List of handlers for the messages understood by this
- * service.
+ * Handle WATCH-message.
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message
*/
-static struct GNUNET_SERVER_MessageHandler handlers[] = {
- {&handle_set, NULL, GNUNET_MESSAGE_TYPE_STATISTICS_SET, 0},
- {&handle_get, NULL, GNUNET_MESSAGE_TYPE_STATISTICS_GET, 0},
- {NULL, NULL, 0, 0}
-};
+static void
+handle_watch (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ char *service;
+ char *name;
+ uint16_t msize;
+ uint16_t size;
+ struct StatsEntry *pos;
+ struct ClientEntry *ce;
+ struct WatchEntry *we;
+ size_t slen;
+
+ if (NULL == nc)
+ {
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_SERVER_client_mark_monitor (client);
+ ce = make_client_entry (client);
+ msize = ntohs (message->size);
+ if (msize < sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ size = msize - sizeof (struct GNUNET_MessageHeader);
+ if (size !=
+ GNUNET_STRINGS_buffer_tokenize ((const char *) &message[1], size, 2,
+ &service, &name))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received request to watch statistic on `%s:%s'\n", service,
+ name);
+ pos = start;
+ while (pos != NULL)
+ {
+ if (matches (pos, service, name))
+ break;
+ pos = pos->next;
+ }
+ if (pos == NULL)
+ {
+ pos =
+ GNUNET_malloc (sizeof (struct StatsEntry) +
+ sizeof (struct GNUNET_STATISTICS_SetMessage) + size);
+ pos->next = start;
+ pos->uid = uidgen++;
+ pos->set = GNUNET_NO;
+ pos->msg = (void *) &pos[1];
+ pos->msg->header.size =
+ htons (sizeof (struct GNUNET_STATISTICS_SetMessage) + size);
+ pos->msg->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_SET);
+ pos->service = (const char *) &pos->msg[1];
+ slen = strlen (service) + 1;
+ memcpy ((void *) pos->service, service, slen);
+ pos->name = &pos->service[slen];
+ memcpy ((void *) pos->name, name, strlen (name) + 1);
+ start = pos;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "New statistic on `%s:%s' with value %llu created.\n", service,
+ name, pos->value);
+ }
+ we = GNUNET_new (struct WatchEntry);
+ we->client = client;
+ we->last_value_set = GNUNET_NO;
+ we->wid = ce->max_wid++;
+ GNUNET_CONTAINER_DLL_insert (pos->we_head, pos->we_tail, we);
+ if (pos->value != 0)
+ notify_change (pos);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Actually perform the shutdown.
+ */
+static void
+do_shutdown ()
+{
+ struct WatchEntry *we;
+ struct StatsEntry *se;
+
+ if (NULL == nc)
+ return;
+ save ();
+ GNUNET_SERVER_notification_context_destroy (nc);
+ nc = NULL;
+ GNUNET_assert (NULL == client_head);
+ while (NULL != (se = start))
+ {
+ start = se->next;
+ while (NULL != (we = se->we_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (se->we_head, se->we_tail, we);
+ GNUNET_free (we);
+ }
+ GNUNET_free (se);
+ }
+}
/**
* @param tc unused
*/
static void
-shutdown_task (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- save ();
+ in_shutdown = GNUNET_YES;
+ if (NULL != client_head)
+ return;
+ do_shutdown ();
+}
+
+
+/**
+ * A client disconnected. Remove all of its data structure entries.
+ *
+ * @param cls closure, NULL
+ * @param client identification of the client
+ */
+static void
+handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
+{
+ struct ClientEntry *ce;
+ struct WatchEntry *we;
+ struct WatchEntry *wen;
+ struct StatsEntry *se;
+
+ ce = client_head;
+ while (NULL != ce)
+ {
+ if (ce->client == client)
+ {
+ GNUNET_CONTAINER_DLL_remove (client_head, client_tail, ce);
+ GNUNET_free (ce);
+ break;
+ }
+ ce = ce->next;
+ }
+ se = start;
+ while (NULL != se)
+ {
+ wen = se->we_head;
+ while (NULL != (we = wen))
+ {
+ wen = we->next;
+ if (we->client != client)
+ continue;
+ GNUNET_CONTAINER_DLL_remove (se->we_head, se->we_tail, we);
+ GNUNET_free (we);
+ }
+ se = se->next;
+ }
+ if ( (NULL == client_head) &&
+ (GNUNET_YES == in_shutdown) )
+ do_shutdown ();
}
* Process statistics requests.
*
* @param cls closure
- * @param sched scheduler to use
* @param server the initialized server
* @param c configuration to use
*/
static void
-run (void *cls,
- struct GNUNET_SCHEDULER_Handle *sched,
- struct GNUNET_SERVER_Handle *server,
+run (void *cls, struct GNUNET_SERVER_Handle *server,
const struct GNUNET_CONFIGURATION_Handle *c)
{
+ static const struct GNUNET_SERVER_MessageHandler handlers[] = {
+ {&handle_set, NULL, GNUNET_MESSAGE_TYPE_STATISTICS_SET, 0},
+ {&handle_get, NULL, GNUNET_MESSAGE_TYPE_STATISTICS_GET, 0},
+ {&handle_watch, NULL, GNUNET_MESSAGE_TYPE_STATISTICS_WATCH, 0},
+ {NULL, NULL, 0, 0}
+ };
cfg = c;
+ srv = server;
GNUNET_SERVER_add_handlers (server, handlers);
+ nc = GNUNET_SERVER_notification_context_create (server, 16);
+ GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
load (server);
- GNUNET_SCHEDULER_add_delayed (sched,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &shutdown_task,
- NULL);
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
+ NULL);
}
main (int argc, char *const *argv)
{
return (GNUNET_OK ==
- GNUNET_SERVICE_run (argc,
- argv,
- "statistics",
- GNUNET_SERVICE_OPTION_NONE,
- &run, NULL)) ? 0 : 1;
+ GNUNET_SERVICE_run (argc, argv, "statistics",
+ GNUNET_SERVICE_OPTION_SOFT_SHUTDOWN, &run, NULL)) ? 0 : 1;
+}
+
+#ifdef LINUX
+#include <malloc.h>
+
+/**
+ * MINIMIZE heap size (way below 128k) since this process doesn't need much.
+ */
+void __attribute__ ((constructor)) GNUNET_ARM_memory_init ()
+{
+ mallopt (M_TRIM_THRESHOLD, 4 * 1024);
+ mallopt (M_TOP_PAD, 1 * 1024);
+ malloc_trim (0);
}
+#endif
+
/* end of gnunet-service-statistics.c */
projects / oweals / gnunet.git / blobdiff