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#include "downloadpool.h"
#include "macros.h"
#include <curl/curl.h>
#include <curl/multi.h>
#include <stdbool.h>
#include <stdlib.h>
struct l2_dlpool__handle {
CURL *easy;
void *user;
struct l2_dlpool__handle *next;
struct l2_dlpool__handle *prev;
};
struct l2_dlpool__pool_tag {
CURLM *multi;
struct l2_dlpool__handle *head, *tail;
l2_dlpool_download_init_proc_t *initproc;
l2_dlpool_one_downloaded_proc_t *dlproc;
};
l2_dlpool_t *l2_dlpool_init(l2_dlpool_download_init_proc_t *init, l2_dlpool_one_downloaded_proc_t *dlproc)
{
l2_dlpool_t *ret = calloc(1, sizeof(l2_dlpool_t));
if (!ret) return NULL;
ret->multi = curl_multi_init();
if (!ret->multi) {
goto cleanup;
}
ret->initproc = init;
ret->dlproc = dlproc;
return ret;
cleanup:
if (ret) {
if (ret->multi) curl_multi_cleanup(ret->multi);
}
free(ret);
return NULL;
}
int l2_dlpool_add(l2_dlpool_t *pool, void *user)
{
int res = -1;
struct l2_dlpool__handle *newhandle = calloc(1, sizeof(struct l2_dlpool__handle));
if (!newhandle) return -1;
newhandle->easy = curl_easy_init();
if (!newhandle->easy) goto cleanup;
curl_easy_setopt(newhandle->easy, CURLOPT_USERAGENT, L2_USER_AGENT);
if ((*pool->initproc)(newhandle->easy, user) < 0) {
res = 0;
goto cleanup;
}
newhandle->user = user;
CURLMcode mc = curl_multi_add_handle(pool->multi, newhandle->easy);
if (mc != CURLM_OK) {
if (mc == CURLM_OUT_OF_MEMORY) {
fputs("CURL out of memory. (You are doomed.)\n", stderr);
abort();
}
goto cleanup;
}
if (pool->tail) {
pool->tail->next = newhandle;
newhandle->prev = pool->tail;
pool->tail = newhandle;
} else {
pool->head = pool->tail = newhandle;
}
return 1;
cleanup:
if (newhandle) {
if (newhandle->easy) curl_easy_cleanup(newhandle->easy);
}
free(newhandle);
return res;
}
int l2_dlpool__download_complete(l2_dlpool_t *pool, CURL *easy, CURLcode code)
{
struct l2_dlpool__handle *handle = NULL;
int uret = 0;
for (struct l2_dlpool__handle *cur = pool->head; cur; cur = cur->next) {
if (cur->easy == easy) {
handle = cur;
continue;
}
}
if (handle) {
uret = (*pool->dlproc)(easy, code, handle->user);
if (handle->prev) {
handle->prev->next = handle->next;
} else {
pool->head = handle->next;
}
if (handle->next) {
handle->next->prev = handle->prev;
} else {
pool->tail = handle->prev;
}
free(handle);
handle = NULL;
}
curl_multi_remove_handle(pool->multi, easy);
curl_easy_cleanup(easy);
if (uret < 0) return -1;
return 0;
}
int l2_dlpool_perform(l2_dlpool_t *pool)
{
CURLMcode code;
int running = 0;
int queuelen = 0;
CURLMsg *msg;
do {
code = curl_multi_perform(pool->multi, &running);
if (code != CURLM_OK) {
return -1;
}
while ((msg = curl_multi_info_read(pool->multi, &queuelen))) {
if (msg->msg == CURLMSG_DONE) {
if (l2_dlpool__download_complete(pool, msg->easy_handle, msg->data.result) < 0) return -1;
}
}
code = curl_multi_poll(pool->multi, NULL, 0, 1000, NULL);
if (code != CURLM_OK) {
return -1;
}
} while (running);
return 0;
}
void l2_dlpool_cleanup(l2_dlpool_t *pool)
{
if (!pool) return;
/* assumes pool->multi is valid (API must not return a handle where this isn't the case) */
/* curl docs say to remove handles BEFORE ANY HANDLES ARE CLEANED UP */
for (struct l2_dlpool__handle *cur = pool->head; cur; cur = cur->next) {
curl_multi_remove_handle(pool->multi, cur->easy); /* assume it succeeds (if it fails, too bad we tried LOL) */
}
for (struct l2_dlpool__handle *cur = pool->head, *temp; cur; cur = temp) {
temp = cur->next;
curl_easy_cleanup(cur->easy);
free(cur);
}
curl_multi_cleanup(pool->multi);
free(pool);
}
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