1 #include <assert.h>
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <uv.h>
5 #include <curl/curl.h>
6
7 uv_loop_t *loop;
8 CURLM *curl_handle;
9 uv_timer_t timeout;
10
11 typedef struct curl_context_s {
12 uv_poll_t poll_handle;
13 curl_socket_t sockfd;
14 } curl_context_t;
15
create_curl_context(curl_socket_t sockfd)16 curl_context_t *create_curl_context(curl_socket_t sockfd) {
17 curl_context_t *context;
18
19 context = (curl_context_t*) malloc(sizeof *context);
20
21 context->sockfd = sockfd;
22
23 int r = uv_poll_init_socket(loop, &context->poll_handle, sockfd);
24 assert(r == 0);
25 context->poll_handle.data = context;
26
27 return context;
28 }
29
curl_close_cb(uv_handle_t * handle)30 void curl_close_cb(uv_handle_t *handle) {
31 curl_context_t *context = (curl_context_t*) handle->data;
32 free(context);
33 }
34
destroy_curl_context(curl_context_t * context)35 void destroy_curl_context(curl_context_t *context) {
36 uv_close((uv_handle_t*) &context->poll_handle, curl_close_cb);
37 }
38
39
add_download(const char * url,int num)40 void add_download(const char *url, int num) {
41 char filename[50];
42 sprintf(filename, "%d.download", num);
43 FILE *file;
44
45 file = fopen(filename, "w");
46 if (file == NULL) {
47 fprintf(stderr, "Error opening %s\n", filename);
48 return;
49 }
50
51 CURL *handle = curl_easy_init();
52 curl_easy_setopt(handle, CURLOPT_WRITEDATA, file);
53 curl_easy_setopt(handle, CURLOPT_URL, url);
54 curl_multi_add_handle(curl_handle, handle);
55 fprintf(stderr, "Added download %s -> %s\n", url, filename);
56 }
57
check_multi_info(void)58 void check_multi_info(void) {
59 char *done_url;
60 CURLMsg *message;
61 int pending;
62
63 while ((message = curl_multi_info_read(curl_handle, &pending))) {
64 switch (message->msg) {
65 case CURLMSG_DONE:
66 curl_easy_getinfo(message->easy_handle, CURLINFO_EFFECTIVE_URL,
67 &done_url);
68 printf("%s DONE\n", done_url);
69
70 curl_multi_remove_handle(curl_handle, message->easy_handle);
71 curl_easy_cleanup(message->easy_handle);
72 break;
73
74 default:
75 fprintf(stderr, "CURLMSG default\n");
76 abort();
77 }
78 }
79 }
80
curl_perform(uv_poll_t * req,int status,int events)81 void curl_perform(uv_poll_t *req, int status, int events) {
82 uv_timer_stop(&timeout);
83 int running_handles;
84 int flags = 0;
85 if (status < 0) flags = CURL_CSELECT_ERR;
86 if (!status && events & UV_READABLE) flags |= CURL_CSELECT_IN;
87 if (!status && events & UV_WRITABLE) flags |= CURL_CSELECT_OUT;
88
89 curl_context_t *context;
90
91 context = (curl_context_t*)req;
92
93 curl_multi_socket_action(curl_handle, context->sockfd, flags, &running_handles);
94 check_multi_info();
95 }
96
on_timeout(uv_timer_t * req)97 void on_timeout(uv_timer_t *req) {
98 int running_handles;
99 curl_multi_socket_action(curl_handle, CURL_SOCKET_TIMEOUT, 0, &running_handles);
100 check_multi_info();
101 }
102
start_timeout(CURLM * multi,long timeout_ms,void * userp)103 void start_timeout(CURLM *multi, long timeout_ms, void *userp) {
104 if (timeout_ms <= 0)
105 timeout_ms = 1; /* 0 means directly call socket_action, but we'll do it in a bit */
106 uv_timer_start(&timeout, on_timeout, timeout_ms, 0);
107 }
108
handle_socket(CURL * easy,curl_socket_t s,int action,void * userp,void * socketp)109 int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp, void *socketp) {
110 curl_context_t *curl_context;
111 if (action == CURL_POLL_IN || action == CURL_POLL_OUT) {
112 if (socketp) {
113 curl_context = (curl_context_t*) socketp;
114 }
115 else {
116 curl_context = create_curl_context(s);
117 curl_multi_assign(curl_handle, s, (void *) curl_context);
118 }
119 }
120
121 switch (action) {
122 case CURL_POLL_IN:
123 uv_poll_start(&curl_context->poll_handle, UV_READABLE, curl_perform);
124 break;
125 case CURL_POLL_OUT:
126 uv_poll_start(&curl_context->poll_handle, UV_WRITABLE, curl_perform);
127 break;
128 case CURL_POLL_REMOVE:
129 if (socketp) {
130 uv_poll_stop(&((curl_context_t*)socketp)->poll_handle);
131 destroy_curl_context((curl_context_t*) socketp);
132 curl_multi_assign(curl_handle, s, NULL);
133 }
134 break;
135 default:
136 abort();
137 }
138
139 return 0;
140 }
141
main(int argc,char ** argv)142 int main(int argc, char **argv) {
143 loop = uv_default_loop();
144
145 if (argc <= 1)
146 return 0;
147
148 if (curl_global_init(CURL_GLOBAL_ALL)) {
149 fprintf(stderr, "Could not init cURL\n");
150 return 1;
151 }
152
153 uv_timer_init(loop, &timeout);
154
155 curl_handle = curl_multi_init();
156 curl_multi_setopt(curl_handle, CURLMOPT_SOCKETFUNCTION, handle_socket);
157 curl_multi_setopt(curl_handle, CURLMOPT_TIMERFUNCTION, start_timeout);
158
159 while (argc-- > 1) {
160 add_download(argv[argc], argc);
161 }
162
163 uv_run(loop, UV_RUN_DEFAULT);
164 curl_multi_cleanup(curl_handle);
165 return 0;
166 }
167
