/**
* \brief This function create new tag group
*/
struct VSTagGroup *vs_taggroup_create(struct VSNode *node,
uint16 tg_id,
uint16 custom_type)
{
struct VSTagGroup *tg = NULL;
struct VBucket *tg_bucket;
if ( !(v_hash_array_count_items(&node->tag_groups) < MAX_TAGGROUPS_COUNT) ) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Maximal number of tag groups in node: %d reached.\n",
node->id);
return NULL;
}
/* Try to create new tag group */
tg = (struct VSTagGroup*)calloc(1, sizeof(VSTagGroup));
if(tg == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "Out of memory.\n");
return NULL;
}
/* Initialize new tag group */
vs_taggroup_init(tg);
if(tg_id == VRS_RESERVED_TAGGROUP_ID) {
/* Try to find first free taggroup_id */
tg->id = node->last_tg_id;
while( v_hash_array_find_item(&node->tag_groups, tg) != NULL) {
/* When not found, then try higher value */
tg->id++;
/* Skip IDs with special purpose */
if(tg->id > LAST_TAGGROUP_ID) {
tg->id = FIRST_TAGGROUP_ID;
}
}
} else {
tg->id = tg_id;
}
node->last_tg_id = tg->id;
/* Try to add TagGroup to the hashed linked list */
tg_bucket = v_hash_array_add_item(&node->tag_groups, tg, sizeof(struct VSTagGroup));
if(tg_bucket == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Tag group could not be added to node: %d.\n",
node->id);
free(tg);
return NULL;
}
/* Copy type */
tg->custom_type = custom_type;
vs_node_inc_version(node);
return tg;
}
/**
* \brief This function creates new VSNode at Verse server
*/
struct VSNode *vs_node_create(struct VS_CTX *vs_ctx,
struct VSNode *parent_node,
struct VSUser *owner,
uint32 node_id,
uint16 custom_type)
{
struct VSNode *node;
struct VSLink *link;
struct VBucket *bucket;
if(! (v_hash_array_count_items(&vs_ctx->data.nodes) < VRS_MAX_COMMON_NODE_COUNT) ) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"max number: %d of nodes reached\n",
VRS_MAX_COMMON_NODE_COUNT);
return NULL;
}
node = (struct VSNode*)calloc(1, sizeof(struct VSNode));
if(node == NULL) {
v_print_log(VRS_PRINT_ERROR, "Out of memory\n");
return NULL;
}
vs_node_init(node);
if(node_id == VRS_RESERVED_NODE_ID) {
/* Try to find first free node_id. It is fast and easy, When
* VRS_LAST_COMMON_NODE_ID did not reach 0xFFFFFFFF-1 value yet and not used
* node_id are not reused.*/
node->id = vs_ctx->data.last_common_node_id + 1;
while( v_hash_array_find_item(&vs_ctx->data.nodes, &node) != NULL) {
node->id++;
/* Node id 0xFFFFFFFF has special purpose and node IDs in range <0, 65535>
* have special purposes too (skip them) */
if(node->id > VRS_LAST_COMMON_NODE_ID)
node->id = VRS_FIRST_COMMON_NODE_ID;
/* TODO: implement faster finding of free node id */
}
vs_ctx->data.last_common_node_id = node->id;
} else {
node->id = node_id;
}
/* Create link to the parent node */
if(parent_node != NULL) {
link = vs_link_create(parent_node, node);
if(link == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "link between nodes %d %d could not be created\n",
parent_node->id, node->id);
free(node);
return NULL;
}
} else {
/* This can happen only for root node */
assert(node_id == VRS_ROOT_NODE_ID);
node->parent_link = NULL;
node->level = 0;
}
/* Add node to the hashed array of all verse nodes */
bucket = v_hash_array_add_item(&vs_ctx->data.nodes, node, sizeof(struct VSNode));
if(bucket == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "node %d could not be added to the hashed list of nodes\n",
node->id);
if(node->parent_link != NULL) {
v_list_free_item(&parent_node->children_links, node->parent_link);
}
free(node);
return NULL;
}
node->owner = owner;
node->type = custom_type;
return node;
}
/**
* \brief This function tries to handle Tag_Create command
*/
int vs_handle_tag_create(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct Generic_Cmd *tag_create)
{
struct VSNode *node;
struct VSTagGroup *tg;
struct VSTag *tag;
struct VBucket *vbucket;
struct VSEntitySubscriber *tg_subscriber;
uint32 node_id = UINT32(tag_create->data[0]);
uint16 taggroup_id = UINT16(tag_create->data[UINT32_SIZE]);
uint16 tag_id = UINT16(tag_create->data[UINT32_SIZE + UINT16_SIZE]);
uint8 data_type = UINT8(tag_create->data[UINT32_SIZE + UINT16_SIZE + UINT16_SIZE]);
uint8 count = UINT8(tag_create->data[UINT32_SIZE + UINT16_SIZE + UINT16_SIZE + UINT8_SIZE]);
uint16 type = UINT16(tag_create->data[UINT32_SIZE + UINT16_SIZE + UINT16_SIZE + UINT8_SIZE + UINT8_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;
}
/* User has to have permission to write to the 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 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;
}
/* Tag Group has to be created too (it can't be in DELETING or DELETED state ) */
if(!(tg->state == ENTITY_CREATED || tg->state == ENTITY_CREATING)) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() tag group (id: %d) from node (id: %d) is not in CREATING or CREATED state: %d\n",
__FUNCTION__, tg->id, node->id, tg->state);
goto end;
}
/* Client has to send tag_create command with tag_id equal to
* the value 0xFFFF */
if(tag_id != RESERVED_TAG_ID) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() tag_id: %d is not 0xFFFF\n",
__FUNCTION__, tag_id);
goto end;
}
/* Is type of Tag supported? */
if(!(data_type>VRS_VALUE_TYPE_RESERVED && data_type<=VRS_VALUE_TYPE_STRING8)) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() tag_type: %d is not supported\n",
__FUNCTION__, data_type);
goto end;
}
vbucket = tg->tags.lb.first;
/* Check, if there isn't tag with the same type */
while(vbucket != NULL) {
tag = vbucket->data;
if(tag->custom_type == type) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() tag type: %d is already used in taggroup: %d\n",
__FUNCTION__, type, tg->id);
goto end;
}
vbucket = vbucket->next;
}
if (v_hash_array_count_items(&tg->tags) > MAX_TAGS_COUNT) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() max number of tags in node: %d tag_group: %d was reached\n",
tg->id);
goto end;
}
/* Try to create new tag */
tag = vs_tag_create(tg, RESERVED_TAG_ID, data_type, count, type);
if(tag == NULL) {
goto end;
}
ret = 1;
tag->state = ENTITY_CREATING;
/* Send TagCreate to all subscribers of tag group */
tg_subscriber = tg->tg_subs.first;
while(tg_subscriber != NULL) {
if(vs_tag_send_create(tg_subscriber, node, tg, tag) != 1) {
ret = 0;
}
tg_subscriber = tg_subscriber->next;
}
end:
pthread_mutex_unlock(&node->mutex);
return ret;
}
/**
* \brief This function is called, when server receives command layer_create
*
* \param[in] *vs_ctx The pointer at verse server context
* \param[in] *vsession The pointer at session of client that sent this command
* \param[in] *layer_create_cmd The pointer at received command
*
* \return This function returns 0, when parameters of received command are
* wrong. When all parameters are right, then it returns 1.
*/
int vs_handle_layer_create(struct VS_CTX *vs_ctx,
struct VSession *vsession,
struct Generic_Cmd *layer_create_cmd)
{
struct VSNode *node;
struct VSUser *user;
struct VSLayer *parent_layer;
struct VSLayer *layer;
struct VBucket *vbucket;
struct VSNodeSubscriber *node_subscriber;
uint32 node_id = UINT32(layer_create_cmd->data[0]);
uint16 parent_layer_id = UINT16(layer_create_cmd->data[UINT32_SIZE]);
uint16 layer_id = UINT16(layer_create_cmd->data[UINT32_SIZE+UINT16_SIZE]);
uint8 data_type = UINT16(layer_create_cmd->data[UINT32_SIZE+UINT16_SIZE+UINT16_SIZE]);
uint8 count = UINT16(layer_create_cmd->data[UINT32_SIZE+UINT16_SIZE+UINT16_SIZE+UINT8_SIZE]);
uint16 type = UINT16(layer_create_cmd->data[UINT32_SIZE+UINT16_SIZE+UINT16_SIZE+UINT8_SIZE+UINT8_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;
}
/* When parent layer id is not -1, then try to find this parent layer */
if(parent_layer_id == RESERVED_LAYER_ID) {
parent_layer = NULL;
} else {
parent_layer = vs_layer_find(node, parent_layer_id);
if(parent_layer == NULL) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() parent layer (id: %d) in node (id: %d) not found\n",
__FUNCTION__, parent_layer_id, 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 write to the node */
if(vs_node_can_write(vs_ctx, vsession, node) != 1) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s(): user: %s can't write to node: %d\n",
__FUNCTION__, user->username, node->id);
return 0;
}
/* Client has to send layer_create command with layer_id equal to
* the value 0xFFFF */
if(layer_id != RESERVED_LAYER_ID) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() layer_id: %d is not 0xFFFF\n",
__FUNCTION__, layer_id);
return 0;
}
/* Is type of Layer supported? */
if(!(data_type>VRS_VALUE_TYPE_RESERVED && data_type<=VRS_VALUE_TYPE_REAL64)) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() data_type: %d is not supported\n",
__FUNCTION__, data_type);
return 0;
}
vbucket = node->layers.lb.first;
/* Check, if there isn't tag with the same type */
while(vbucket != NULL) {
layer = vbucket->data;
if(layer->type == type) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() layer type: %d is already used in layer: %d\n",
__FUNCTION__, type, layer->id);
return 0;
}
vbucket = vbucket->next;
}
if (v_hash_array_count_items(&node->layers) > MAX_LAYERS_COUNT) {
v_print_log(VRS_PRINT_DEBUG_MSG, "%s() max number of layers in node: %d was reached\n",
node->id);
return 0;
}
layer = vs_layer_create(node, parent_layer, data_type, count, type);
/* Try to find first free id for layer */
/* TODO: this could be more effective */
layer->id = node->last_layer_id;
while( v_hash_array_find_item(&node->layers, layer) != NULL ) {
layer->id++;
if(layer->id > LAST_LAYER_ID) {
layer->id = FIRST_LAYER_ID;
}
}
node->last_layer_id = layer->id;
/* Try to add new Tag to the hashed linked list of tags */
vbucket = v_hash_array_add_item(&node->layers, (void*)layer, sizeof(struct VSLayer));
if(vbucket==NULL) {
free(layer);
return 0;
}
layer->state = ENTITY_CREATING;
/* Send layer_create to all node subscribers */
node_subscriber = node->node_subs.first;
while(node_subscriber != NULL) {
vs_layer_send_create(node_subscriber, node, layer);
node_subscriber = node_subscriber->next;
}
return 0;
}
