cluster.c
29.1 KB
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/*
clsync - file tree sync utility based on fanotify and inotify
Copyright (C) 2013 Dmitry Yu Okunev <xai@mephi.ru> 0x8E30679C
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
Hello, dear developer.
Cluster technologies are almost always very difficult. So I'll try to
fill this code with comments. Enjoy ;)
Also you can ask me directly by e-mail or IRC, if something seems too
hard.
-- 0x8E30679C
*/
#ifdef CLUSTER_SUPPORT
#include "common.h"
#include "cluster.h"
#include "sync.h"
#include "output.h"
#include "malloc.h"
// Global variables. They will be initialized in cluster_init()
int sock = -1;
options_t *options_p = NULL;
indexes_t *indexes_p = NULL;
pthread_t pthread_cluster;
nodeinfo_t nodeinfo[MAXNODES] = {{0}};
nodeinfo_t *nodeinfo_my = NULL;
uint8_t node_id_my = NODEID_NOID;
uint8_t node_ids[MAXNODES] = {0};
unsigned int cluster_timeout = 0;
uint8_t node_count = 0;
uint8_t node_online = 0;
cluster_recvproc_funct_t recvproc_funct[COUNT_CLUSTERCMDID] = {NULL};
window_t window = {0};
uint32_t clustercmd_crc32_table[1<<8];
/**
* @brief Adds command (message) to window buffer
*
* @param[in] clustercmd_p Pointer to cluster cmd to put into window
*
* @retval zero Successful
* @retval non-zero If got error while deleting the message. The error-code is placed into returned value.
*
*/
static inline int clustercmd_window_add(clustercmd_t *clustercmd_p) {
// Checking if there enough window cells allocated
if(window.packets_len >= window.size) {
window.size += ALLOC_PORTION;
# define CXREALLOC(a, size) \
(typeof(a))xrealloc((char *)(a), (size_t)(size) * sizeof(*(a)))
window.packets_id = CXREALLOC(window.packets_id, window.size);
window.occupied_sides = CXREALLOC(window.occupied_sides, window.size);
# undef CXREALLOC
}
// Calculating required memory space in buffer for the message
size_t clustercmd_size = CLUSTERCMD_SIZE(*clustercmd_p);
size_t required_space = sizeof(clustercmdwaitackhdr_t) + clustercmd_size;
// Searching occupied boundaries in the window buffer
size_t occupied_left = SIZE_MAX, occupied_right=0;
int i;
i = 0;
while(i < window.packets_len) {
unsigned int window_id;
window_id = window.packets_id[i];
occupied_left = MIN(occupied_left, window.occupied_sides[window_id].left);
occupied_right = MAX(occupied_right, window.occupied_sides[window_id].right);
}
printf_ddd("Debug3: clustercmd_window_add(): w.size == %u, b_left == %u; b_right == %u; w.buf_size == %u; r_space == %u\n",
window.size, occupied_left, occupied_right, window.buf_size, required_space);
// Trying to find a space in the buffer to place message
size_t buf_coordinate = SIZE_MAX;
if(window.packets_len) {
// Free space from left (start of buffer)
size_t free_left = occupied_left;
// Free space from right (end of buffer)
size_t free_right = window.buf_size - occupied_right;
if(free_left > required_space)
buf_coordinate = free_left - required_space;
else
if(free_right > required_space)
buf_coordinate = occupied_right;
else
{
// Not enough space in the window buffer;
window.buf_size += MAX(CLUSTER_WINDOW_BUFSIZE_PORTION, required_space);
window.buf = xrealloc(window.buf, window.buf_size);
buf_coordinate = occupied_right;
}
printf_ddd("Debug3: clustercmd_window_add(): f_left == %u; f_right == %u; b_coord == %u; w.buf_size == %u",
free_left, free_right, buf_coordinate, window.buf_size);
}
unsigned int window_id;
// packet id in window
window_id = window.packets_len;
// reserving the space in buffer
window.occupied_sides[window_id].left = buf_coordinate;
window.occupied_sides[window_id].right = buf_coordinate + required_space;
// placing information into buffer
clustercmdwaitack_t *waitack_p;
waitack_p = (clustercmdwaitack_t *)&window.buf[buf_coordinate];
memset(&waitack_p->h, 0, sizeof(waitack_p->h));
memcpy(&waitack_p->cmd, clustercmd_p, clustercmd_size);
waitack_p->h.window_id = window_id;
// remembering new packet
g_hash_table_insert(window.serial2waitack_ht, GINT_TO_POINTER(clustercmd_p->h.serial), waitack_p);
window.packets_id[window.packets_len++] = window_id;
return 0;
}
/**
* @brief Removes command (message) from window buffer
*
* @param[in] waitack_p Pointer to waitack structure of the command (message)
*
* @retval zero Successful
* @retval non-zero If got error while deleting the message. The error-code is placed into returned value.
*
*/
static inline int clustercmd_window_del(clustercmdwaitack_t *waitack_p) {
#ifdef PARANOID
if(!window.size) {
printf_e("Error: clustercmd_window_del(): window is not allocated.");
return EINVAL;
}
if(!window.packets_len) {
printf_e("Error: clustercmd_window_del(): there already no packets in the window.");
return EINVAL;
}
#endif
unsigned int window_id_del = waitack_p->h.window_id;
unsigned int window_id_last = --window.packets_len;
// Forgeting the packet
// Moving the last packet into place of deleting packet, to free the tail in "window.packets_id" and "window.occupied_sides"
if(window_id_del != window_id_last) {
printf_ddd("Debug3: clustercmd_window_del(): %i -> %i\n", window_id_last, window_id_del);
window.packets_id[window_id_del] = window.packets_id[window_id_last];
memcpy(&window.occupied_sides[window_id_del], &window.occupied_sides[window_id_last], sizeof(window.occupied_sides[window_id_del]));
}
// Removing from hash table
g_hash_table_remove(window.serial2waitack_ht, GINT_TO_POINTER(waitack_p->cmd.h.serial));
return 0;
}
/**
* @brief Initializes table for CRC32 calculations
*
* @param[in] clustercmd_p Pointer to clustercmd
*
* @retval uint32_t CRC32 value of clustecmd
*
*/
/*
Name : CRC-32
Poly : 0x04C11DB7 x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11
+ x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
Init : 0xFFFFFFFF
Revert: true
XorOut: 0xFFFFFFFF
Check : 0xCBF43926 ("123456789")
*/
int clustercmd_crc32_calc_init() {
int i;
uint32_t crc32;
i=0;
while(i < (1<<8)) {
int j;
crc32 = i;
j = 0;
while(j < 8) {
crc32 = (crc32 & 1) ? (crc32 >> 1) ^ 0xEDB88320 : crc32 >> 1;
j++;
}
clustercmd_crc32_table[i] = crc32;
i++;
};
return 0;
}
/**
* @brief Calculates CRC32 for clustercmd
*
* @param[in] clustercmd_p Pointer to clustercmd
*
* @retval uint32_t CRC32 value of clustecmd
*
*/
/*
Name : CRC-32
Poly : 0x04C11DB7 x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11
+ x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
Init : 0xFFFFFFFF
Revert: true
XorOut: 0xFFFFFFFF
Check : 0xCBF43926 ("123456789")
*/
uint32_t clustercmd_crc32_calc(clustercmd_t *clustercmd_p) {
uint32_t crc32, crc32_save;
// Preparing
crc32_save = clustercmd_p->h.crc32;
clustercmd_p->h.crc32 = 0;
crc32 = 0xFFFFFFFF;
uint32_t size = CLUSTERCMD_SIZE(*clustercmd_p);
char *ptr = (char *)clustercmd_p;
// Calculating
while(size--)
crc32 = clustercmd_crc32_table[(crc32 ^ *(ptr++)) & 0xFF] ^ (crc32 >> 8);
// Ending
clustercmd_p->h.crc32 = crc32_save;
return crc32 ^ 0xFFFFFFFF;
}
/**
* @brief Changes information about node's status in nodeinfo[] and updates connected information.
*
* @param[in] node_id node_id of the node.
* @param[in] node_status New node status.
*
* @retval zero Successful
* @retval non-zero If got error while changing the status. The error-code is placed into returned value.
*
*/
int node_status_change(uint8_t node_id, uint8_t node_status) {
uint8_t node_status_old = nodeinfo[node_id].status;
nodeinfo_t *nodeinfo_p = &nodeinfo[node_id];
if((node_status == NODESTATUS_DOESNTEXIST) && (node_status_old != NODESTATUS_DOESNTEXIST)) {
node_count--;
node_ids[nodeinfo_p->num] = node_ids[node_count];
g_hash_table_destroy(nodeinfo_p->modtime_ht);
#ifdef VERYPARANOID
memset(nodeinfo_p, 0, sizeof(*nodeinfo_p));
#endif
return 0;
}
if(node_status == node_status_old)
return 0;
switch(node_status_old) {
case NODESTATUS_DOESNTEXIST:
nodeinfo_p->id = node_id;
nodeinfo_p->num = node_count;
node_ids[node_count] = node_id;
node_count++;
#ifdef PARANOID
if(node_status == NODESTATUS_OFFLINE)
break;
#endif
case NODESTATUS_OFFLINE:
node_online++;
break;
default:
if(node_status == NODESTATUS_OFFLINE)
node_online--;
break;
}
nodeinfo[node_id].status = node_status;
return 0;
}
/**
* @brief Sets message processing functions for cluster_recv_proc() function for specified command type
*
* @param[in] cmd_id The command type
* @param[in] procfunct The processing function for messages with specified cmd_id
*
* @retval zero Successful
* @retval non-zero If got error while setting processing function. The error-code is placed into returned value.
*
*/
static inline int cluster_recv_proc_set(clustercmd_id_t cmd_id, cluster_recvproc_funct_t procfunct) {
recvproc_funct[cmd_id] = procfunct;
return 0;
}
/**
* @brief Receives message from another nodes of the cluster.
*
* @param[i/o] clustercmd_pp Pointer to command structure pointer. It will be re-allocated every time when size is not enough.
* @param[i/o] size_p Pointer to size of allocated memory for command structure (see related to clustercmd_pp). The value of size will be updated on re-allocs.
* @param[i/o] timeout_p Pointer to timeout (in milliseconds). Timeout is assumed zero if the pointer is NULL. After waiting the event timeout value will be decreased on elapsed time.
*
* @retval 1 If there's new message.
* @retval 0 If there's no new messages.
* @retval -1 If got error while receiving. The error-code is placed into "errno".
*
*/
int cluster_recv(clustercmd_t **clustercmd_pp, size_t *size_p, unsigned int *timeout_p) {
int timeout;
size_t size;
#ifdef PARANOID
// Checking arguments
if((clustercmd_pp == NULL) || (size_p == NULL)) {
printf_e("Error: cluster_recv() clustercmd_p or size_p is equals to NULL.\n");
return EINVAL;
}
if((*clustercmd_pp != NULL) && (*size_p == 0)) {
printf_e("Error: cluster_recv(): *clustercmd_pp != NULL && *size_p == 0.\n");
return EINVAL;
}
if((*clustercmd_pp == NULL) && (*size_p != 0)) {
printf_e("Error: cluster_recv(): *clustercmd_pp == NULL && *size_p != 0.\n");
return EINVAL;
}
#endif
// Getting the timeout
timeout = (timeout_p == NULL ? 0 : *timeout_p);
// Getting size
if(*size_p) {
size = *size_p;
} else {
size = BUFSIZ;
*clustercmd_pp = (clustercmd_t *)xmalloc(size);
}
// Getting clustercmd_p
clustercmd_t *clustercmd_p = *clustercmd_pp;
// CODE HERE
if(clustercmd_p->h.src_node_id >= MAXNODES) {
printf_e("Warning: cluster_recv(): Invalid h.src_node_id: %i >= "XTOSTR(MAXNODES)"\n", clustercmd_p->h.src_node_id);
}
if(clustercmd_p->h.dst_node_id >= MAXNODES) {
printf_e("Warning: cluster_recv(): Invalid h.dst_node_id: %i >= "XTOSTR(MAXNODES)"\n", clustercmd_p->h.dst_node_id);
}
printf_ddd("Debug3: cluster_recv(): Received: {h.dst_node_id: %u, h.src_node_id: %u, cmd_id: %u, crc32: %u, data_len: %u}, timeout: %u -> %u\n",
clustercmd_p->h.dst_node_id, clustercmd_p->h.src_node_id, clustercmd_p->h.cmd_id, clustercmd_p->h.crc32, clustercmd_p->h.data_len, *timeout_p, timeout);
// Setting the timeout
if(timeout_p != NULL)
*timeout_p = timeout;
// Setting the size
*size_p = size;
uint32_t crc32 = clustercmd_crc32_calc(clustercmd_p);
if(crc32 != clustercmd_p->h.crc32) {
// CLUSTER_ALLOCA(clustercmd_p, )
printf_d("Debug: cluster_recv(): CRC32 mismatch: clustercmd_p->crc32 != clustercmd_crc32_calc(clustercmd_p): %p != %p.\n", (void*)(long)clustercmd_p->h.crc32, (void*)(long)crc32);
// cluster_send
}
// Paranoid routines
// The message from us? Something wrong if it is.
#ifdef PARANOID
if(clustercmd_p->h.src_node_id == node_id_my) {
#ifdef VERYPARANOID
printf_e("Error: cluster_recv(): clustercmd_p->h.src_node_id == node_id_my (%i != %i). Exit.\n", clustercmd_p->h.src_node_id, node_id_my);
return EINVAL;
#else
printf_e("Warning: cluster_recv(): clustercmd_p->h.src_node_id == node_id_my (%i != %i). Ignoring the command.\n", clustercmd_p->h.src_node_id, node_id_my);
clustercmd_p = NULL;
return 0;
#endif
}
#endif
return 0;
}
/**
* @brief (hsyncop) Reads messages for time "_timeout" and proceeding them to recvproc_funct[] functions
*
* @param[in] _timeout How long to wait messages (totally)
*
* @retval zero Successful
* @retval non-zero If got error while reading or processing messages. The error-code is placed into returned value.
*
*/
int cluster_recv_proc(unsigned int _timeout) {
int ret;
clustercmd_t *clustercmd_p=NULL;
size_t size=0;
unsigned int timeout = _timeout;
while((ret=cluster_recv(&clustercmd_p, &size, &timeout))) {
// Exit if error
if(ret == -1) {
printf_e("Error: cluster_recv_proc(): Got error while cluster_recv(): %s (%i).\n", strerror(errno), errno);
return errno;
}
// If we have appropriate callback function, then call it! :)
if(recvproc_funct[clustercmd_p->h.cmd_id])
if((ret=recvproc_funct[clustercmd_p->h.cmd_id](clustercmd_p))) {
printf_e("Error: cluster_recv_proc(): Got error from recvproc_funct[%i]: %s (%i)\n", clustercmd_p->h.cmd_id, strerror(ret), ret);
return ret;
}
}
free(clustercmd_p);
return 0;
}
/**
* @brief recvproc-function for ACK-messages
*
* @param[in] clustercmd_p Pointer to clustercmd
* @param[in] arg_p Pointer to argument
*
* @retval zero Successfully initialized.
* @retval non-zero Got error, while initializing.
*
*/
static int cluster_recvproc_ack(clustercmd_t *clustercmd_p) {
uint32_t cmd_serial_ack = clustercmd_p->data_ack.serial;
clustercmdwaitack_t *waitack_p = (clustercmdwaitack_t *)g_hash_table_lookup(window.serial2waitack_ht, GINT_TO_POINTER(cmd_serial_ack));
if(waitack_p == NULL)
return 0;
uint8_t node_id_from = clustercmd_p->h.src_node_id;
if(! waitack_p->h.ack_from[node_id_from]) {
waitack_p->h.ack_count++;
waitack_p->h.ack_from[node_id_from]++;
if(waitack_p->h.ack_count == node_count)
clustercmd_window_del(waitack_p);
}
return 0;
}
/**
* @brief Sets message processing functions for cluster_recv_proc() function for specified command type
*
* @param[in] cmd_id The command type
* @param[in] procfunct The processing function for messages with specified cmd_id
*
* @retval zero Successful
* @retval non-zero If got error while setting processing function. The error-code is placed into returned value.
*
*/
int cluster_recv_proc_init() {
window.serial2waitack_ht = g_hash_table_new_full(g_direct_hash, g_direct_equal, 0, 0);
cluster_recv_proc_set(CLUSTERCMDID_ACK, cluster_recvproc_ack);
return 0;
}
/**
* @brief Antagonist of cluster_recv_proc_init() function. Freeing everything what was allocated in cluster_recv_proc_init()
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_recv_proc_deinit() {
if(window.serial2waitack_ht != NULL)
g_hash_table_destroy(window.serial2waitack_ht);
if(window.buf_size) {
#ifdef PARANOID
if(window.buf == NULL) {
printf_e("Error: cluster_recv_proc_deinit(): window_buf_size != 0, but window_buf == NULL.\n");
} else
#endif
free(window.buf);
}
return 0;
}
/**
* @brief Sends message to another nodes of the cluster.
*
* @param[in] clustercmd_p Command structure pointer.
*
* @retval zero Successfully send.
* @retval non-zero Got error, while sending.
*
*/
int cluster_send(clustercmd_t *clustercmd_p) {
clustercmd_p->h.src_node_id = node_id_my;
// CODE HERE
printf_ddd("Debug3: cluster_send(): Sending: {h.dst_node_id: %u, h.src_node_id: %u, cmd_id: %u, crc32: %u, data_len: %u}\n",
clustercmd_p->h.dst_node_id, clustercmd_p->h.src_node_id, clustercmd_p->h.cmd_id, clustercmd_p->h.crc32, clustercmd_p->h.data_len);
return 0;
}
/**
* @brief (syncop) Sends message to another nodes of the cluster and waits for ACK-answers. (with skipping all other packets)
*
* @param[in] clustercmd_p Command structure pointer.
*
* @retval zero Successfully send.
* @retval non-zero Got error, while sending.
*
* /
int cluster_send_ack(clustercmd_t *clustercmd_p) {
uint32_t cmd_serial = clustercmd_p->serial;
// Sending the message
int ret = cluster_send(clustercmd_p);
if(ret) {
printf_e("Error: cluster_send_ack(): Got error from cluster_send(): %s (errno %i).\n", strerror(ret), ret);
return ret;
}
// Waiting for ACK-messages from all registered nodes
{
clustercmd_t *clustercmd_p=NULL;
size_t size=0;
unsigned int timeout = cluster_timeout;
while((ret=cluster_recv(&clustercmd_p, &size, &timeout)) && (timeout>0)) {
// Skipping not ACK-messages.
CLUSTER_LOOP_EXPECTCMD(clustercmd_p, CLUSTERCMDID_ACK, ret);
// Is this an acknowledge packet for us? Skipping if not.
clustercmd_ack_t *data_ack_p = &clustercmd_p->data_ack;
if(clustercmd_p->h.dst_node_id != node_id_my)
continue;
// Is this acknowledge packet about the commend we sent? Skipping if not.
if(data_ack_p->serial != cmd_serial)
continue;
}
free(clustercmd_p);
}
return 0;
}
*/
/**
* @brief recvproc-function for setid-messages
*
* @param[in] clustercmd_p Pointer to clustercmd
* @param[in] arg_p Pointer to argument
*
* @retval zero Successfully initialized.
* @retval non-zero Got error, while initializing.
*
*/
static int cluster_recvproc_setid(clustercmd_t *clustercmd_p) {
static time_t updatets = 0;
// Is this the most recent information? Skipping if not.
clustercmd_setiddata_t *data_setid_p = &clustercmd_p->data_setid;
if(!(data_setid_p->updatets > updatets))
return 0;
// Is the node name length in message equals to our node name length? Skipping if not.
uint32_t recv_nodename_len;
recv_nodename_len = CLUSTER_RESTDATALEN(clustercmd_p, clustercmd_setiddata_t);
if(recv_nodename_len != options_p->cluster_nodename_len)
return 0;
// Is the node name equals to ours? Skipping if not.
if(memcmp(data_setid_p->node_name, options_p->cluster_nodename, recv_nodename_len))
return 0;
// Remembering the node that answered us
node_status_change(clustercmd_p->h.src_node_id, NODESTATUS_SEEMSONLINE);
// Seems, that somebody knows our node id, remembering it.
node_id_my = clustercmd_p->h.dst_node_id;
updatets = data_setid_p->updatets;
return 0;
}
extern int cluster_loop();
/**
* @brief Initializes cluster subsystem.
*
* @param[in] _options_p Pointer to "options" variable, defined in main().
* @param[in] _indexes_p Pointer to "indexes" variable, defined in sync_run().
*
* @retval zero Successfully initialized.
* @retval non-zero Got error, while initializing.
*
*/
int cluster_init(options_t *_options_p, indexes_t *_indexes_p) {
int ret;
// Preventing double initializing
if(options_p != NULL) {
printf_e("Error: cluster_init(): cluster subsystem is already initialized.\n");
return EALREADY;
}
// Initializing network routines
sock = socket(AF_INET, SOCK_DGRAM, 0);
int reuse = 1;
if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,(char *)&reuse, sizeof(reuse)) < 0) {
printf_e("Error: cluster_init(): Got error while setsockopt(): %s (errno: %i)\n", strerror(errno), errno);
return errno;
}
struct sockaddr_in sa = {0};
(void)sa; // Anti-warning
sa.sin_family = AF_INET;
sa.sin_port = htons(options_p->cluster_mcastipport);
sa.sin_addr.s_addr = INADDR_ANY;
// Initializing global variables, pt. 1
options_p = _options_p;
indexes_p = _indexes_p;
cluster_timeout = options_p->cluster_timeout * 1000;
// Initializing another routines
clustercmd_crc32_calc_init();
cluster_recv_proc_init();
// Getting my ID in the cluster
// Trying to preserve my node_id after restart. :)
// Asking another nodes about my previous node_id
{
clustercmd_t *clustercmd_p = CLUSTER_ALLOCA(clustercmd_getmyid_t, options_p->cluster_nodename_len);
memcpy(clustercmd_p->data_getmyid.node_name, options_p->cluster_nodename, clustercmd_p->h.data_len+1);
clustercmd_p->h.cmd_id = CLUSTERCMDID_GETMYID;
cluster_send(clustercmd_p);
}
// Processing answers
cluster_recv_proc_set(CLUSTERCMDID_SETID, cluster_recvproc_setid);
if((ret=cluster_recv_proc(cluster_timeout)))
return ret;
printf_ddd("Debug3: cluster_init(): After communicating with others, my node_id is %i.\n", node_id_my);
// Getting free node_id if nobody said us the certain value (see above).
if(node_id_my == NODEID_NOID) {
int i=0;
while(i<MAXNODES) {
if(nodeinfo[i].status == NODESTATUS_DOESNTEXIST) {
node_id_my = i;
break;
}
i++;
}
printf_ddd("Debug3: cluster_init(): I was have to set my node_id to %i.\n", node_id_my);
}
// If there's no free id-s, then exit :(
if(node_id_my == NODEID_NOID) {
printf_e("Error: Cannot find free node ID. Seems, that all %i ID-s are already occupied.\n");
return ENOMEM;
}
// Registering in the cluster
// Sending registration information
node_status_change(node_id_my, NODESTATUS_SEEMSONLINE);
{
clustercmd_t *clustercmd_p = CLUSTER_ALLOCA(clustercmd_register_t, options_p->cluster_nodename_len);
clustercmd_register_t *data_register_p = &clustercmd_p->data_register;
memcpy(data_register_p->node_name, options_p->cluster_nodename, options_p->cluster_nodename_len+1);
clustercmd_p->h.cmd_id = CLUSTERCMDID_REGISTER;
cluster_send(clustercmd_p);
}
// Getting answers
if((ret=cluster_recv_proc(cluster_timeout)))
return ret;
node_status_change(node_id_my, NODESTATUS_ONLINE);
// Initializing global variables, pt. 2
nodeinfo_my = &nodeinfo[node_id_my];
nodeinfo_my->modtime_ht = g_hash_table_new_full(g_str_hash, g_str_equal, free, 0);
// Running thread, that will process background communicating routines with another nodes.
// The process is based on function cluster_loop() [let's use shorthand "cluster_loop()-thread"]
ret = pthread_create(&pthread_cluster, NULL, (void *(*)(void *))cluster_loop, NULL);
return ret;
}
/**
* @brief (syncop) Sends signal to cluster_loop()-thread
*
* @param[in] signal Signal number
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
static inline int cluster_signal(int signal) {
return pthread_kill(pthread_cluster, signal);
}
/**
* @brief Antagonist of cluster_init() function. Kills cluster_loop()-thread and cleaning up
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_deinit() {
int ret = 0;
cluster_signal(SIGTERM);
ret = pthread_join(pthread_cluster, NULL);
cluster_recv_proc_deinit();
#ifdef VERYPARANOID
int i=0;
#endif
while(node_count) {
#ifdef VERYPARANOID
if(i++ > NODES_MAX) {
printf_e("Error: cluster_deinit() looped. Forcing break.");
break;
}
#endif
node_status_change(0, NODESTATUS_DOESNTEXIST);
}
#ifdef VERYPARANOID
memset(node_info, 0, sizeof(node_info));
node_count = 0;
node_online = 0;
node_id_my = NODEID_NOID;
#endif
return ret;
}
/**
* @brief (syncop) Forces anothes nodes to ignore events about the file or directory
*
* @param[in] fpath Path to the file or directory
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_lock(const char *fpath) {
return 0;
}
/**
* @brief (syncop) Forces anothes nodes to ignore events about all files and directories listed in queues of "indexes_p"
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_lock_byindexes() {
return 0;
}
/**
* @brief (syncop) Returns events-handling on another nodes about all files and directories, locked by cluster_lock() and cluster_lock_byindexes() from this node
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_unlock_all() {
return 0;
}
#define CLUSTER_LOOP_CHECK(a) {\
int ret = a;\
if(ret) {\
sync_term(ret);\
return ret;\
}\
}
/**
* @brief Processes background communicating routines with another nodes. cluster_init() function create a thread for this function.
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_loop() {
sigset_t sigset_cluster;
// Ignoring SIGINT signal
sigemptyset(&sigset_cluster);
sigaddset(&sigset_cluster, SIGINT);
CLUSTER_LOOP_CHECK(pthread_sigmask(SIG_BLOCK, &sigset_cluster, NULL));
// Don't ignoring SIGTERM signal
sigemptyset(&sigset_cluster);
sigaddset(&sigset_cluster, SIGTERM);
CLUSTER_LOOP_CHECK(pthread_sigmask(SIG_UNBLOCK, &sigset_cluster, NULL));
// Starting the loop
while(1) {
// Breaking the loop, if there's SIGTERM signal for this thread
if(sigpending(&sigset_cluster))
if(sigismember(&sigset_cluster, SIGTERM))
break;
// LISTENING
}
return 0;
#ifdef DOXYGEN
sync_term(0);
#endif
}
/**
* @brief Updating information about modification time of a directory.
*
* @param[in] path Canonized path to updated file/dir
* @param[in] dirlevel Directory level provided by fts (man 3 fts)
* @param[in] st_mode st_mode value to detect is it directory or not (S_IFDIR or not)
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_modtime_update(const char *path, short int dirlevel, mode_t st_mode) {
// "modtime" is incorrent name-part of function. Actually it updates "change time" (man 2 lstat64).
int ret;
// Getting relative directory level (depth)
short int dirlevel_rel = dirlevel - options_p->watchdir_dirlevel;
if((st_mode & S_IFMT) == S_IFDIR)
dirlevel_rel++;
// Don't remembering information about directories with level beyond the limits
if((dirlevel_rel > options_p->cluster_scan_dl_max) || (dirlevel_rel < options_p->cluster_hash_dl_min))
return 0;
// Getting directory/file-'s information (including "change time" aka "st_ctime")
struct stat64 stat64;
ret=lstat64(path, &stat64);
if(ret) {
printf_e("Error: cluster_modtime_update() cannot lstat64() on \"%s\": %s (errno: %i)\n", path, strerror(errno), errno);
return errno;
}
// Getting absolute directory path
const char *dirpath;
if((st_mode & S_IFMT) == S_IFDIR) {
dirpath = path;
} else {
char *path_dup = strdup(path);
dirpath = (const char *)dirname(path_dup);
free(path_dup);
}
// Getting relative directory path
// Initializing
size_t dirpath_len = strlen(dirpath);
char *dirpath_rel_p = xmalloc(dirpath_len+1);
char *dirpath_rel = dirpath_rel_p;
const char *dirpath_rel_full = &dirpath[options_p->watchdirlen];
size_t dirpath_rel_full_len = dirpath_len - options_p->watchdirlen;
// Getting coodinate of the end (directory path is already canonized, so we can simply count number of slashes to get directory level)
int slashcount=0;
size_t dirpath_rel_end=0;
while(dirpath_rel_full[dirpath_rel_end] && (dirpath_rel_end < dirpath_rel_full_len)) {
if(dirpath_rel_full[dirpath_rel_end] == '/') {
slashcount++;
if(slashcount >= options_p->cluster_hash_dl_max)
break;
}
dirpath_rel_end++;
}
// Copy the required part of path to dirpath_rel
memcpy(dirpath_rel, dirpath_rel_full, dirpath_rel_end);
// Updating "st_ctime" information. We should check current value for this directory and update it only if it less or not set.
// Checking current value
char toupdate = 0;
gpointer ctime_gp = g_hash_table_lookup(nodeinfo_my->modtime_ht, dirpath_rel);
if(ctime_gp == NULL)
toupdate++;
else if(GPOINTER_TO_INT(ctime_gp) < stat64.st_ctime)
toupdate++;
// g_hash_table_replace() will replace existent information about the directory or create it if it doesn't exist.
if(toupdate)
g_hash_table_replace(nodeinfo_my->modtime_ht, strdup(dirpath_rel), GINT_TO_POINTER(stat64.st_ctime));
// Why I'm using "st_ctime" instead of "st_mtime"? Because "st_ctime" also updates on updating inode information.
return 0;
}
/**
* @brief (syncop) Exchanging with "modtime_ht"-s to be able to compare them.
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_modtime_exchange() {
return 0;
}
/**
* @brief (syncop) Syncing file tree with another nodes with using of directories' modification time as a recent-detector.
*
* @param[in] dirpath Path to the directory
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_initialsync() {
cluster_modtime_exchange();
return 0;
}
/**
* @brief (syncop) "Captures" right to update the file or directory to another nodes. It just removes events about the file of directory from another nodes
*
* @param[in] dirpath Path to the directory
*
* @retval zero Successfully initialized
* @retval non-zero Got error, while initializing
*
*/
int cluster_capture(const char *path) {
return 0;
}
#endif