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#include "uwsgi.h"

extern struct uwsgi_server uwsgi;

void uwsgi_init_queue() {

if (!uwsgi.queue_blocksize)

uwsgi.queue_blocksize = 8192;

if ((uwsgi.queue_blocksize * uwsgi.queue_size) % uwsgi.page_size != 0) {

uwsgi_log("invalid queue size/blocksize %llu: must be a multiple of memory page size (%d bytes)\n", (unsigned long long) uwsgi.queue_blocksize, uwsgi.page_size);

exit(1);

}

if (uwsgi.queue_store) {

uwsgi.queue_filesize = uwsgi.queue_blocksize * uwsgi.queue_size + 16;

int queue_fd;

struct stat qst;

if (stat(uwsgi.queue_store, &qst)) {

uwsgi_log("creating a new queue store file: %s\n", uwsgi.queue_store);

queue_fd = open(uwsgi.queue_store, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);

if (queue_fd >= 0) {

// fill the queue store

if (ftruncate(queue_fd, uwsgi.queue_filesize)) {

uwsgi_log("ftruncate()");

exit(1);

}

}

}

else {

if ((size_t) qst.st_size != uwsgi.queue_filesize || !S_ISREG(qst.st_mode)) {

uwsgi_log("invalid queue store file. Please remove it or fix queue blocksize/items to match its size\n");

exit(1);

}

queue_fd = open(uwsgi.queue_store, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);

uwsgi_log("recovered queue from backing store file: %s\n", uwsgi.queue_store);

}

if (queue_fd < 0) {

uwsgi_error_open(uwsgi.queue_store);

exit(1);

}

uwsgi.queue = mmap(NULL, uwsgi.queue_filesize, PROT_READ | PROT_WRITE, MAP_SHARED, queue_fd, 0);

// fix header

uwsgi.queue_header = uwsgi.queue;

uwsgi.queue += 16;

close(queue_fd);

}

else {

uwsgi.queue = mmap(NULL, (uwsgi.queue_blocksize * uwsgi.queue_size) + 16, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);

// fix header

uwsgi.queue_header = uwsgi.queue;

uwsgi.queue += 16;

uwsgi.queue_header->pos = 0;

uwsgi.queue_header->pull_pos = 0;

}

if (uwsgi.queue == MAP_FAILED) {

uwsgi_error("mmap()");

exit(1);

}

uwsgi.queue_lock = uwsgi_rwlock_init("queue");

uwsgi_log("*** Queue subsystem initialized: %luMB preallocated ***\n", (uwsgi.queue_blocksize * uwsgi.queue_size) / (1024 * 1024));

}

char *uwsgi_queue_get(uint64_t index, uint64_t * size) {

struct uwsgi_queue_item *uqi;

char *ptr = (char *) uwsgi.queue;

if (index >= uwsgi.queue_size)

return NULL;

ptr = ptr + (uwsgi.queue_blocksize * index);

uqi = (struct uwsgi_queue_item *) ptr;

*size = uqi->size;

return ptr + sizeof(struct uwsgi_queue_item);

}

char *uwsgi_queue_pop(uint64_t * size) {

struct uwsgi_queue_item *uqi;

char *ptr = (char *) uwsgi.queue;

if (uwsgi.queue_header->pos == 0) {

uwsgi.queue_header->pos = uwsgi.queue_size - 1;

}

else {

uwsgi.queue_header->pos--;

}

ptr = ptr + (uwsgi.queue_blocksize * uwsgi.queue_header->pos);

uqi = (struct uwsgi_queue_item *) ptr;

if (!uqi->size)

return NULL;

*size = uqi->size;

// remove item

uqi->size = 0;

return ptr + sizeof(struct uwsgi_queue_item);

}

char *uwsgi_queue_pull(uint64_t * size) {

struct uwsgi_queue_item *uqi;

char *ptr = (char *) uwsgi.queue;

ptr = ptr + (uwsgi.queue_blocksize * uwsgi.queue_header->pull_pos);

uqi = (struct uwsgi_queue_item *) ptr;

if (!uqi->size)

return NULL;

*size = uqi->size;

uwsgi.queue_header->pull_pos++;

if (uwsgi.queue_header->pull_pos >= uwsgi.queue_size)

uwsgi.queue_header->pull_pos = 0;

// remove item

uqi->size = 0;

return ptr + sizeof(struct uwsgi_queue_item);

}

int uwsgi_queue_push(char *message, uint64_t size) {

struct uwsgi_queue_item *uqi;

char *ptr = (char *) uwsgi.queue;

if (size > uwsgi.queue_blocksize - sizeof(struct uwsgi_queue_item))

return 0;

if (!size)

return 0;

ptr = ptr + (uwsgi.queue_blocksize * uwsgi.queue_header->pos);

uqi = (struct uwsgi_queue_item *) ptr;

ptr += sizeof(struct uwsgi_queue_item);

uqi->size = size;

uqi->ts = uwsgi_now();

memcpy(ptr, message, size);

uwsgi.queue_header->pos++;

if (uwsgi.queue_header->pos >= uwsgi.queue_size)

uwsgi.queue_header->pos = 0;

return 1;

}

int uwsgi_queue_set(uint64_t pos, char *message, uint64_t size) {

struct uwsgi_queue_item *uqi;

char *ptr = (char *) uwsgi.queue;

if (size > uwsgi.queue_blocksize + sizeof(struct uwsgi_queue_item))

return 0;

if (!size)

return 0;

if (pos >= uwsgi.queue_size)

return 0;

ptr = ptr + (uwsgi.queue_blocksize * pos);

uqi = (struct uwsgi_queue_item *) ptr;

ptr += sizeof(struct uwsgi_queue_item);

uqi->size = size;

uqi->ts = uwsgi_now();

memcpy(ptr, message, size);

return 1;

}