/**
* \brief This function handle changing link between nodes
*/
int vs_handle_link_change(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct Generic_Cmd *node_link)
{
struct VSUser *user = (struct VSUser*)vsession->user;
struct VSNode *old_parent_node, *parent_node, *child_node;
struct VSLink *link;
struct VSNodeSubscriber *node_subscriber;
struct VSEntityFollower *node_follower;
uint32 parent_node_id = UINT32(node_link->data[0]);
uint32 child_node_id = UINT32(node_link->data[UINT32_SIZE]);
int i;
/* Try to find child node */
if((child_node = vs_node_find(vs_ctx, child_node_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s():%d node (id: %d) not found\n",
__FUNCTION__, __LINE__, child_node_id);
return 0;
}
/* Child node has to be created */
if(! (child_node->state == ENTITY_CREATED || child_node->state == ENTITY_CREATING)) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s():%d node id: %d is not in NODE_CREATED state: %d\n",
__FUNCTION__, __LINE__, child_node->id, child_node->state);
return 0;
}
/* Is user owner of child node or can user write to child node? */
if(vs_node_can_write(vsession, child_node) != 1) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s():%d user: %s can't write to child node: %d (owner: %s)\n",
__FUNCTION__, __LINE__, user->username, child_node->id,
child_node->owner->username);
return 0;
}
/* Old link */
link = child_node->parent_link;
/* Old parent node */
old_parent_node = link->parent;
/* Is user owner of old parent node or can user write to old parent node? */
if(vs_node_can_write(vsession, old_parent_node) != 1) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s():%d user: %s can't write to old parent node: %d (owner: %s)\n",
__FUNCTION__, __LINE__, user->username, old_parent_node->id,
old_parent_node->owner->username);
return 0;
}
/* Try to find new parent node */
if((parent_node = vs_node_find(vs_ctx, parent_node_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s():%d node (id: %d) not found\n",
__FUNCTION__, __LINE__, parent_node_id);
return 0;
}
/* Parent node has to be created */
if(! (parent_node->state == ENTITY_CREATED || parent_node->state == ENTITY_CREATING)) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s():%d node (id: %d) is not in NODE_CREATED state: %d\n",
__FUNCTION__, __LINE__, parent_node->id, parent_node->state);
return 0;
}
/* Test if client doesn't want to recreate existing link */
if( parent_node == old_parent_node) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s():%d link between nodes (parent_id: %d) (child_id: %d) already exists\n",
__FUNCTION__, __LINE__, parent_node->id, child_node->id);
return 0;
}
/* Is user owner of parent node or can user write to parent node? */
if(vs_node_can_write(vsession, parent_node) != 1) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s():%d user: %s can't write to parent node: %d (owner: %s)\n",
__FUNCTION__, __LINE__, user->username, parent_node->id,
parent_node->owner->username);
return 0;
}
/* Test, if new link could be created */
if(vs_link_test_nodes(parent_node, child_node) != 1) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s():%d node: %d can't be child of node: %d\n",
__FUNCTION__, __LINE__, child_node->id, parent_node->id);
return 0;
}
/* Remove link from old parent node */
v_list_rem_item(&old_parent_node->children_links, link);
/* Add link to new parent node */
v_list_add_tail(&parent_node->children_links, link);
link->parent = parent_node;
/* Update child node internal properties according new parent node */
vs_link_update_child(parent_node, child_node);
/* Update version in child node, parent node and old parent node */
vs_node_inc_version(parent_node);
vs_node_inc_version(child_node);
vs_node_inc_version(old_parent_node);
/* Subscribers of old and new parent node will receive information about
* changing link between nodes. Prevent double sending command Node_Link,
* when clients are subscribed to both nodes. */
/* Set temporary value in all sessions */
for(i=0; i<vs_ctx->max_sessions; i++) {
vs_ctx->vsessions[i]->tmp = 0;
}
/* Send Node_Link command to subscribers of old parent node and set
* session temporary value */
node_subscriber = old_parent_node->node_subs.first;
while(node_subscriber != NULL) {
if(vs_node_can_read(node_subscriber->session, old_parent_node) == 1) {
node_subscriber->session->tmp = 1;
vs_link_change_send(node_subscriber, link);
}
node_subscriber = node_subscriber->next;
}
/* When client is subscribed to the new parent node and aware of child
* node, then send to the client only node_link */
node_follower = child_node->node_folls.first;
while(node_follower != NULL) {
if(node_follower->node_sub->session->tmp != 1) {
vs_link_change_send(node_follower->node_sub, link);
node_follower->node_sub->session->tmp = 1;
}
node_follower = node_follower->next;
}
/* Send Node_Create command to subscribers of new parent node, when
* subscribers were not subscribed to child node */
node_subscriber = parent_node->node_subs.first;
while(node_subscriber != NULL) {
if(node_subscriber->session->tmp != 1) {
if(vs_node_can_read(node_subscriber->session, parent_node) == 1) {
vs_node_send_create(node_subscriber, child_node, NULL);
}
}
node_subscriber = node_subscriber->next;
}
return 1;
}
/**
* \brief This function add session (client) to the list of clients that are
* subscribed this node.
*/
static int vs_node_subscribe(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct VSNode *node,
uint32 version)
{
struct VSNode *child_node;
struct VSNodePermission *perm;
struct VSNodeSubscriber *node_subscriber;
struct VSLink *link;
struct VBucket *bucket;
struct VSTagGroup *tg;
struct VSLayer *layer;
int user_can_read = 0;
/* Can user subscribe to this node? */
user_can_read = vs_node_can_read(vs_ctx, vsession, node);
/* Add current session to the list of node subscribers */
node_subscriber = (struct VSNodeSubscriber*)calloc(1, sizeof(struct VSNodeSubscriber));
node_subscriber->session = vsession;
node_subscriber->prio = VRS_DEFAULT_PRIORITY;
v_list_add_tail(&node->node_subs, node_subscriber);
/* TODO: send node_subscribe with version and commands with difference
* between this version and current state, when versing will be supported */
if(version != 0) {
v_print_log(VRS_PRINT_WARNING, "Version: %d != 0, versing is not supported yet\n", version);
}
/* Send node_perm commands to the new subscriber */
perm = node->permissions.first;
while(perm != NULL) {
vs_node_send_perm(node_subscriber, node, perm->user, perm->permissions);
perm = perm->next;
}
/* If the node is locked, then send node_lock to the subscriber */
if(node->lock.session != NULL) {
vs_node_send_lock(node_subscriber, node->lock.session, node);
}
/* If user doesn't have permission to subscribe to this node, then send
* only node_perm command explaining, why user can't rest of this
* node */
if(user_can_read == 0) {
v_print_log(VRS_PRINT_DEBUG_MSG, "Insufficient permission to read content of the node: %d\n", node->id);
return 0;
}
/* Send node_create of all child nodes of this node and corresponding
* links */
link = node->children_links.first;
while(link!=NULL) {
child_node = link->child;
vs_node_send_create(node_subscriber, child_node, NULL);
link = link->next;
}
/* Send taggroup_create of all tag_groups in this node */
bucket = node->tag_groups.lb.first;
while(bucket != NULL) {
tg = (struct VSTagGroup*)bucket->data;
if(tg->state == ENTITY_CREATING || tg->state == ENTITY_CREATED) {
vs_taggroup_send_create(node_subscriber, node, tg);
}
bucket = bucket->next;
}
/* Send layer_create for all layers in this node */
bucket = node->layers.lb.first;
while(bucket != NULL) {
layer = (struct VSLayer*)bucket->data;
if(layer->state == ENTITY_CREATING || layer->state == ENTITY_CREATED) {
vs_layer_send_create(node_subscriber, node, layer);
}
bucket = bucket->next;
}
return 1;
}
/**
* \brief This function handle node_subscribe command
*/
int vs_handle_taggroup_subscribe(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct Generic_Cmd *taggroup_subscribe)
{
struct VSNode *node;
uint32 node_id = UINT32(taggroup_subscribe->data[0]);
uint16 taggroup_id = UINT16(taggroup_subscribe->data[UINT32_SIZE]);
int ret = 0;
/* Try to find node */
if((node = vs_node_find(vs_ctx, node_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() node (id: %d) not found\n",
__FUNCTION__, node_id);
return 0;
}
pthread_mutex_lock(&node->mutex);
/* Node has to be created */
if( vs_node_is_created(node) != 1 ) {
goto end;
}
/* Is user owner of the node or can user read the node? */
if(vs_node_can_read(vsession, node) == 1) {
struct VSNodeSubscriber *node_subscriber;
struct VSTagGroup *tg;
struct VSTag *tag;
struct VSEntitySubscriber *tg_subscriber;
struct VBucket *bucket;
/* Try to find node subscriber */
node_subscriber = node->node_subs.first;
while(node_subscriber != NULL) {
if(node_subscriber->session == vsession) {
break;
}
node_subscriber = node_subscriber->next;
}
/* Client has to be subscribed to the node first */
if(node_subscriber == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s(): client has to be subscribed to the node: %d before subscribing to the tag_group: %d\n",
__FUNCTION__, node_id, taggroup_id);
goto end;
}
/* Try to find TagGroup */
if( (tg = vs_taggroup_find(node, taggroup_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s() tag_group (id: %d) in node (id: %d) not found\n",
__FUNCTION__, taggroup_id, node_id);
goto end;
}
/* Is Client already subscribed to this tag group? */
tg_subscriber = tg->tg_subs.first;
while(tg_subscriber != NULL) {
if(tg_subscriber->node_sub->session->session_id == vsession->session_id) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s() client already subscribed to the tag_group (id: %d) in node (id: %d)\n",
__FUNCTION__, taggroup_id, node_id);
goto end;
}
tg_subscriber = tg_subscriber->next;
}
ret = 1;
/* Add new subscriber to the list of tag group subscribers */
tg_subscriber = (struct VSEntitySubscriber*)malloc(sizeof(struct VSEntitySubscriber));
tg_subscriber->node_sub = node_subscriber;
v_list_add_tail(&tg->tg_subs, tg_subscriber);
/* Send tag create for all tags in this tag group
* TODO: do not send all tags at once, when there is lot of tags in this
* tag group. Implement this, when queue limits will be finished. */
bucket = tg->tags.lb.first;
while(bucket != NULL) {
tag = (struct VSTag*)bucket->data;
if(tag->state == ENTITY_CREATING || tag->state == ENTITY_CREATED) {
if(vs_tag_send_create(tg_subscriber, node, tg, tag) != 1) {
ret = 0;
}
}
bucket = bucket->next;
}
} else {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s(): user: %s doesn't have permissions to subscribe to taggroup: %d in node: %d\n",
__FUNCTION__,
((struct VSUser *)vsession->user)->username,
taggroup_id, node->id);
}
end:
pthread_mutex_unlock(&node->mutex);
return ret;
}
/**
* \brief This function tries to handle node_create command
*/
int vs_handle_taggroup_create(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct Generic_Cmd *taggroup_create_cmd)
{
struct VSNode *node;
struct VSTagGroup *tg;
struct VBucket *vbucket;
uint32 node_id = UINT32(taggroup_create_cmd->data[0]);
uint16 taggroup_id = UINT16(taggroup_create_cmd->data[UINT32_SIZE]);
uint16 type = UINT16(taggroup_create_cmd->data[UINT32_SIZE+UINT16_SIZE]);
int ret = 0;
/* Client has to send taggroup_create command with taggroup_id equal to
* the value 0xFFFF */
if(taggroup_id != VRS_RESERVED_TAGGROUP_ID) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() taggroup_id: %d is not 0xFFFF\n",
__FUNCTION__, taggroup_id);
return 0;
}
/* Try to find node */
if((node = vs_node_find(vs_ctx, node_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() node (id: %d) not found\n",
__FUNCTION__, node_id);
return 0;
}
pthread_mutex_lock(&node->mutex);
/* Node has to be created */
if( vs_node_is_created(node) != 1 ) {
goto end;
}
vbucket = node->tag_groups.lb.first;
/* Check, if there isn't tag group with the same type */
while(vbucket != NULL) {
tg = vbucket->data;
if(tg->custom_type == type) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s() taggroup type: %d is already used in node: %d\n",
__FUNCTION__, type, node->id);
goto end;
}
vbucket = vbucket->next;
}
/* Is user owner of this node or can user write to this node? */
if(vs_node_can_write(vsession, node) != 1) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s(): user: %s can't write to node: %d\n",
__FUNCTION__,
((struct VSUser *)vsession->user)->username,
node->id);
goto end;
}
/* Try to create new tag group */
tg = vs_taggroup_create(node, VRS_RESERVED_TAGGROUP_ID, type);
if(tg == NULL) {
goto end;
} else {
struct VSNodeSubscriber *node_subscriber;
/* Set state for this entity */
tg->state = ENTITY_CREATING;
ret = 1;
/* Send tag group create command to all subscribers to the node
* that can read this node */
for(node_subscriber = node->node_subs.first;
node_subscriber != NULL;
node_subscriber = node_subscriber->next)
{
if( vs_node_can_read(node_subscriber->session, node) == 1) {
if(vs_taggroup_send_create(node_subscriber, node, tg) != 1) {
ret = 0;
}
}
}
}
end:
pthread_mutex_unlock(&node->mutex);
return ret;
}
/**
* \brief This function handle node_subscribe command
*/
int vs_handle_taggroup_subscribe(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct Generic_Cmd *taggroup_subscribe)
{
struct VSNode *node;
uint32 node_id = UINT32(taggroup_subscribe->data[0]);
uint16 taggroup_id = UINT16(taggroup_subscribe->data[UINT32_SIZE]);
int ret = 0;
/* Try to find node */
if((node = vs_node_find(vs_ctx, node_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() node (id: %d) not found\n",
__func__, node_id);
return 0;
}
pthread_mutex_lock(&node->mutex);
/* Node has to be created */
if( vs_node_is_created(node) != 1 ) {
goto end;
}
/* Is user owner of the node or can user read the node? */
if(vs_node_can_read(vsession, node) == 1) {
struct VSNodeSubscriber *node_subscriber;
struct VSTagGroup *tg;
struct VSTag *tag;
struct VSEntitySubscriber *tg_subscriber;
struct VBucket *bucket;
/* Try to find node subscriber */
node_subscriber = node->node_subs.first;
while(node_subscriber != NULL) {
if(node_subscriber->session == vsession) {
break;
}
node_subscriber = node_subscriber->next;
}
/* Client has to be subscribed to the node first */
if(node_subscriber == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s(): client has to be subscribed to the node: %d before subscribing to the tag_group: %d\n",
__func__, node_id, taggroup_id);
goto end;
}
/* Try to find TagGroup */
if( (tg = vs_taggroup_find(node, taggroup_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s() tag_group (id: %d) in node (id: %d) not found\n",
__func__, taggroup_id, node_id);
goto end;
}
/* Is Client already subscribed to this tag group? */
tg_subscriber = tg->tg_subs.first;
while(tg_subscriber != NULL) {
if(tg_subscriber->node_sub->session->session_id == vsession->session_id) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s() client already subscribed to the tag_group (id: %d) in node (id: %d)\n",
__func__, taggroup_id, node_id);
goto end;
}
tg_subscriber = tg_subscriber->next;
}
ret = 1;
/* Add new subscriber to the list of tag group subscribers */
tg_subscriber = (struct VSEntitySubscriber*)malloc(sizeof(struct VSEntitySubscriber));
tg_subscriber->node_sub = node_subscriber;
v_list_add_tail(&tg->tg_subs, tg_subscriber);
/* Try to send tag_create for all tags in this tag group */
bucket = tg->tags.lb.first;
while(bucket != NULL) {
tag = (struct VSTag*)bucket->data;
vs_tag_send_create(tg_subscriber, node, tg, tag);
/* When TCP/WebSocket is used and tag is initialized, then it
* is possible (necessary) to send value too. */
if( ((vsession->flags & VRS_TP_TCP) ||
(vsession->flags & VRS_TP_WEBSOCKET)) &&
(tag->flag & TAG_INITIALIZED))
{
vs_tag_send_set(vsession, node_subscriber->prio, node, tg, tag);
}
bucket = bucket->next;
}
} else {
v_print_log(VRS_PRINT_DEBUG_MSG,
"%s(): user: %s doesn't have permissions to subscribe to taggroup: %d in node: %d\n",
__func__,
((struct VSUser *)vsession->user)->username,
taggroup_id, node->id);
}
end:
pthread_mutex_unlock(&node->mutex);
return ret;
}
int vs_handle_layer_subscribe(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct Generic_Cmd *layer_subscribe_cmd)
{
struct VSNode *node;
struct VSUser *user;
struct VSLayer *layer;
struct VSNodeSubscriber *node_subscriber;
struct VSEntitySubscriber *layer_subscriber;
struct VBucket *vbucket;
struct VSLayerValue *value;
uint32 node_id = UINT32(layer_subscribe_cmd->data[0]);
uint16 layer_id = UINT16(layer_subscribe_cmd->data[UINT32_SIZE]);
/*
uint32 version = UINT32(layer_subscribe_cmd->data[UINT32_SIZE+UINT16_SIZE]);
uint32 crc32 = UINT32(layer_subscribe_cmd->data[UINT32_SIZE+UINT16_SIZE+UINT32_SIZE]);
*/
/* Try to find node */
if((node = vs_node_find(vs_ctx, node_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() node (id: %d) not found\n",
__FUNCTION__, node_id);
return 0;
}
/* Node has to be created */
if(!(node->state == ENTITY_CREATED || node->state == ENTITY_CREATING)) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() node (id: %d) is not in CREATING or CREATED state: %d\n",
__FUNCTION__, node->id, node->state);
return 0;
}
/* Try to find user */
if((user = vs_user_find(vs_ctx, vsession->user_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() vsession->user_id: %d not found\n",
__FUNCTION__, vsession->user_id);
return 0;
}
/* User has to have permission to read the node */
if(vs_node_can_read(vs_ctx, vsession, node) != 1) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s(): user: %s can't read the node: %d\n",
__FUNCTION__, user->username, node->id);
return 0;
}
/* Try to find node subscriber */
node_subscriber = node->node_subs.first;
while(node_subscriber != NULL) {
if(node_subscriber->session == vsession) {
break;
}
node_subscriber = node_subscriber->next;
}
/* Client has to be subscribed to the node first */
if(node_subscriber == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s(): client has to be subscribed to the node: %d before subscribing to the layer: %d\n",
__FUNCTION__, node_id, layer_id);
return 0;
}
/* Try to find layer */
if( (layer = vs_layer_find(node, layer_id)) == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() layer (id: %d) in node (id: %d) not found\n",
__FUNCTION__, layer_id, node_id);
return 0;
}
/* Layer has to be created */
if(! (layer->state == ENTITY_CREATING || layer->state == ENTITY_CREATED)) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() layer (id: %u) in node (id: %d) is not in CREATED state: %d\n",
__FUNCTION__, layer->id, node->id, node->state);
return 0;
}
/* Try to find layer subscriber (client can't be subscribed twice) */
layer_subscriber = layer->layer_subs.first;
while(layer_subscriber != NULL) {
if(layer_subscriber->node_sub->session->session_id == vsession->session_id) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() client already subscribed to the layer (id: %d) in node (id: %d)\n",
__FUNCTION__, layer_id, node_id);
return 0;
}
layer_subscriber = layer_subscriber->next;
}
/* Add new subscriber to the list of layer subscribers */
layer_subscriber = (struct VSEntitySubscriber*)malloc(sizeof(struct VSEntitySubscriber));
layer_subscriber->node_sub = node_subscriber;
v_list_add_tail(&layer->layer_subs, layer_subscriber);
/* Send value set for all items in this layer
* TODO: do not push all values to outgoing queue at once, when there is lot
* of values in this layer. Implement this, when queue limits will be
* finished. */
vbucket = layer->values.lb.first;
while(vbucket != NULL) {
value = (struct VSLayerValue*)vbucket->data;
vs_layer_send_set_value(layer_subscriber, node, layer, value);
vbucket = vbucket->next;
}
return 1;
}
