Merge branch 'jc/count'
[git] / http.c
1 #include "http.h"
2
3 int data_received;
4 int active_requests = 0;
5
6 #ifdef USE_CURL_MULTI
7 int max_requests = -1;
8 CURLM *curlm;
9 #endif
10 #ifndef NO_CURL_EASY_DUPHANDLE
11 CURL *curl_default;
12 #endif
13 char curl_errorstr[CURL_ERROR_SIZE];
14
15 int curl_ssl_verify = -1;
16 char *ssl_cert = NULL;
17 #if LIBCURL_VERSION_NUM >= 0x070902
18 char *ssl_key = NULL;
19 #endif
20 #if LIBCURL_VERSION_NUM >= 0x070908
21 char *ssl_capath = NULL;
22 #endif
23 char *ssl_cainfo = NULL;
24 long curl_low_speed_limit = -1;
25 long curl_low_speed_time = -1;
26
27 struct curl_slist *pragma_header;
28 struct curl_slist *no_range_header;
29
30 struct active_request_slot *active_queue_head = NULL;
31
32 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
33                            struct buffer *buffer)
34 {
35         size_t size = eltsize * nmemb;
36         if (size > buffer->size - buffer->posn)
37                 size = buffer->size - buffer->posn;
38         memcpy(ptr, buffer->buffer + buffer->posn, size);
39         buffer->posn += size;
40         return size;
41 }
42
43 size_t fwrite_buffer(const void *ptr, size_t eltsize,
44                             size_t nmemb, struct buffer *buffer)
45 {
46         size_t size = eltsize * nmemb;
47         if (size > buffer->size - buffer->posn) {
48                 buffer->size = buffer->size * 3 / 2;
49                 if (buffer->size < buffer->posn + size)
50                         buffer->size = buffer->posn + size;
51                 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
52         }
53         memcpy(buffer->buffer + buffer->posn, ptr, size);
54         buffer->posn += size;
55         data_received++;
56         return size;
57 }
58
59 size_t fwrite_null(const void *ptr, size_t eltsize,
60                           size_t nmemb, struct buffer *buffer)
61 {
62         data_received++;
63         return eltsize * nmemb;
64 }
65
66 static void finish_active_slot(struct active_request_slot *slot);
67
68 #ifdef USE_CURL_MULTI
69 static void process_curl_messages(void)
70 {
71         int num_messages;
72         struct active_request_slot *slot;
73         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
74
75         while (curl_message != NULL) {
76                 if (curl_message->msg == CURLMSG_DONE) {
77                         int curl_result = curl_message->data.result;
78                         slot = active_queue_head;
79                         while (slot != NULL &&
80                                slot->curl != curl_message->easy_handle)
81                                 slot = slot->next;
82                         if (slot != NULL) {
83                                 curl_multi_remove_handle(curlm, slot->curl);
84                                 slot->curl_result = curl_result;
85                                 finish_active_slot(slot);
86                         } else {
87                                 fprintf(stderr, "Received DONE message for unknown request!\n");
88                         }
89                 } else {
90                         fprintf(stderr, "Unknown CURL message received: %d\n",
91                                 (int)curl_message->msg);
92                 }
93                 curl_message = curl_multi_info_read(curlm, &num_messages);
94         }
95 }
96 #endif
97
98 static int http_options(const char *var, const char *value)
99 {
100         if (!strcmp("http.sslverify", var)) {
101                 if (curl_ssl_verify == -1) {
102                         curl_ssl_verify = git_config_bool(var, value);
103                 }
104                 return 0;
105         }
106
107         if (!strcmp("http.sslcert", var)) {
108                 if (ssl_cert == NULL) {
109                         ssl_cert = xmalloc(strlen(value)+1);
110                         strcpy(ssl_cert, value);
111                 }
112                 return 0;
113         }
114 #if LIBCURL_VERSION_NUM >= 0x070902
115         if (!strcmp("http.sslkey", var)) {
116                 if (ssl_key == NULL) {
117                         ssl_key = xmalloc(strlen(value)+1);
118                         strcpy(ssl_key, value);
119                 }
120                 return 0;
121         }
122 #endif
123 #if LIBCURL_VERSION_NUM >= 0x070908
124         if (!strcmp("http.sslcapath", var)) {
125                 if (ssl_capath == NULL) {
126                         ssl_capath = xmalloc(strlen(value)+1);
127                         strcpy(ssl_capath, value);
128                 }
129                 return 0;
130         }
131 #endif
132         if (!strcmp("http.sslcainfo", var)) {
133                 if (ssl_cainfo == NULL) {
134                         ssl_cainfo = xmalloc(strlen(value)+1);
135                         strcpy(ssl_cainfo, value);
136                 }
137                 return 0;
138         }
139
140 #ifdef USE_CURL_MULTI   
141         if (!strcmp("http.maxrequests", var)) {
142                 if (max_requests == -1)
143                         max_requests = git_config_int(var, value);
144                 return 0;
145         }
146 #endif
147
148         if (!strcmp("http.lowspeedlimit", var)) {
149                 if (curl_low_speed_limit == -1)
150                         curl_low_speed_limit = (long)git_config_int(var, value);
151                 return 0;
152         }
153         if (!strcmp("http.lowspeedtime", var)) {
154                 if (curl_low_speed_time == -1)
155                         curl_low_speed_time = (long)git_config_int(var, value);
156                 return 0;
157         }
158
159         /* Fall back on the default ones */
160         return git_default_config(var, value);
161 }
162
163 static CURL* get_curl_handle(void)
164 {
165         CURL* result = curl_easy_init();
166
167         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
168 #if LIBCURL_VERSION_NUM >= 0x070907
169         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
170 #endif
171
172         if (ssl_cert != NULL)
173                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
174 #if LIBCURL_VERSION_NUM >= 0x070902
175         if (ssl_key != NULL)
176                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
177 #endif
178 #if LIBCURL_VERSION_NUM >= 0x070908
179         if (ssl_capath != NULL)
180                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
181 #endif
182         if (ssl_cainfo != NULL)
183                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
184         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
185
186         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
187                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
188                                  curl_low_speed_limit);
189                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
190                                  curl_low_speed_time);
191         }
192
193         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
194
195         if (getenv("GIT_CURL_VERBOSE"))
196                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
197
198         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
199
200         return result;
201 }
202
203 void http_init(void)
204 {
205         char *low_speed_limit;
206         char *low_speed_time;
207
208         curl_global_init(CURL_GLOBAL_ALL);
209
210         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
211         no_range_header = curl_slist_append(no_range_header, "Range:");
212
213 #ifdef USE_CURL_MULTI
214         {
215                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
216                 if (http_max_requests != NULL)
217                         max_requests = atoi(http_max_requests);
218         }
219
220         curlm = curl_multi_init();
221         if (curlm == NULL) {
222                 fprintf(stderr, "Error creating curl multi handle.\n");
223                 exit(1);
224         }
225 #endif
226
227         if (getenv("GIT_SSL_NO_VERIFY"))
228                 curl_ssl_verify = 0;
229
230         ssl_cert = getenv("GIT_SSL_CERT");
231 #if LIBCURL_VERSION_NUM >= 0x070902
232         ssl_key = getenv("GIT_SSL_KEY");
233 #endif
234 #if LIBCURL_VERSION_NUM >= 0x070908
235         ssl_capath = getenv("GIT_SSL_CAPATH");
236 #endif
237         ssl_cainfo = getenv("GIT_SSL_CAINFO");
238
239         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
240         if (low_speed_limit != NULL)
241                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
242         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
243         if (low_speed_time != NULL)
244                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
245
246         git_config(http_options);
247
248         if (curl_ssl_verify == -1)
249                 curl_ssl_verify = 1;
250
251 #ifdef USE_CURL_MULTI
252         if (max_requests < 1)
253                 max_requests = DEFAULT_MAX_REQUESTS;
254 #endif
255
256 #ifndef NO_CURL_EASY_DUPHANDLE
257         curl_default = get_curl_handle();
258 #endif
259 }
260
261 void http_cleanup(void)
262 {
263         struct active_request_slot *slot = active_queue_head;
264 #ifdef USE_CURL_MULTI
265         char *wait_url;
266 #endif
267
268         while (slot != NULL) {
269 #ifdef USE_CURL_MULTI
270                 if (slot->in_use) {
271                         curl_easy_getinfo(slot->curl,
272                                           CURLINFO_EFFECTIVE_URL,
273                                           &wait_url);
274                         fprintf(stderr, "Waiting for %s\n", wait_url);
275                         run_active_slot(slot);
276                 }
277 #endif
278                 if (slot->curl != NULL)
279                         curl_easy_cleanup(slot->curl);
280                 slot = slot->next;
281         }
282
283 #ifndef NO_CURL_EASY_DUPHANDLE
284         curl_easy_cleanup(curl_default);
285 #endif
286
287 #ifdef USE_CURL_MULTI
288         curl_multi_cleanup(curlm);
289 #endif
290         curl_global_cleanup();
291         
292 }
293
294 struct active_request_slot *get_active_slot(void)
295 {
296         struct active_request_slot *slot = active_queue_head;
297         struct active_request_slot *newslot;
298
299 #ifdef USE_CURL_MULTI
300         int num_transfers;
301
302         /* Wait for a slot to open up if the queue is full */
303         while (active_requests >= max_requests) {
304                 curl_multi_perform(curlm, &num_transfers);
305                 if (num_transfers < active_requests) {
306                         process_curl_messages();
307                 }
308         }
309 #endif
310
311         while (slot != NULL && slot->in_use) {
312                 slot = slot->next;
313         }
314         if (slot == NULL) {
315                 newslot = xmalloc(sizeof(*newslot));
316                 newslot->curl = NULL;
317                 newslot->in_use = 0;
318                 newslot->next = NULL;
319
320                 slot = active_queue_head;
321                 if (slot == NULL) {
322                         active_queue_head = newslot;
323                 } else {
324                         while (slot->next != NULL) {
325                                 slot = slot->next;
326                         }
327                         slot->next = newslot;
328                 }
329                 slot = newslot;
330         }
331
332         if (slot->curl == NULL) {
333 #ifdef NO_CURL_EASY_DUPHANDLE
334                 slot->curl = get_curl_handle();
335 #else
336                 slot->curl = curl_easy_duphandle(curl_default);
337 #endif
338         }
339
340         active_requests++;
341         slot->in_use = 1;
342         slot->local = NULL;
343         slot->results = NULL;
344         slot->finished = NULL;
345         slot->callback_data = NULL;
346         slot->callback_func = NULL;
347         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
348         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
349         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
350
351         return slot;
352 }
353
354 int start_active_slot(struct active_request_slot *slot)
355 {
356 #ifdef USE_CURL_MULTI
357         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
358
359         if (curlm_result != CURLM_OK &&
360             curlm_result != CURLM_CALL_MULTI_PERFORM) {
361                 active_requests--;
362                 slot->in_use = 0;
363                 return 0;
364         }
365 #endif
366         return 1;
367 }
368
369 #ifdef USE_CURL_MULTI
370 void step_active_slots(void)
371 {
372         int num_transfers;
373         CURLMcode curlm_result;
374
375         do {
376                 curlm_result = curl_multi_perform(curlm, &num_transfers);
377         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
378         if (num_transfers < active_requests) {
379                 process_curl_messages();
380                 fill_active_slots();
381         }
382 }
383 #endif
384
385 void run_active_slot(struct active_request_slot *slot)
386 {
387 #ifdef USE_CURL_MULTI
388         long last_pos = 0;
389         long current_pos;
390         fd_set readfds;
391         fd_set writefds;
392         fd_set excfds;
393         int max_fd;
394         struct timeval select_timeout;
395         int finished = 0;
396
397         slot->finished = &finished;
398         while (!finished) {
399                 data_received = 0;
400                 step_active_slots();
401
402                 if (!data_received && slot->local != NULL) {
403                         current_pos = ftell(slot->local);
404                         if (current_pos > last_pos)
405                                 data_received++;
406                         last_pos = current_pos;
407                 }
408
409                 if (slot->in_use && !data_received) {
410                         max_fd = 0;
411                         FD_ZERO(&readfds);
412                         FD_ZERO(&writefds);
413                         FD_ZERO(&excfds);
414                         select_timeout.tv_sec = 0;
415                         select_timeout.tv_usec = 50000;
416                         select(max_fd, &readfds, &writefds,
417                                &excfds, &select_timeout);
418                 }
419         }
420 #else
421         while (slot->in_use) {
422                 slot->curl_result = curl_easy_perform(slot->curl);
423                 finish_active_slot(slot);
424         }
425 #endif
426 }
427
428 static void closedown_active_slot(struct active_request_slot *slot)
429 {
430         active_requests--;
431         slot->in_use = 0;
432 }
433
434 void release_active_slot(struct active_request_slot *slot)
435 {
436         closedown_active_slot(slot);
437         if (slot->curl) {
438                 curl_multi_remove_handle(curlm, slot->curl);
439                 curl_easy_cleanup(slot->curl);
440                 slot->curl = NULL;
441         }
442         fill_active_slots();
443 }
444
445 static void finish_active_slot(struct active_request_slot *slot)
446 {
447         closedown_active_slot(slot);
448         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
449
450         if (slot->finished != NULL)
451                 (*slot->finished) = 1;
452
453         /* Store slot results so they can be read after the slot is reused */
454         if (slot->results != NULL) {
455                 slot->results->curl_result = slot->curl_result;
456                 slot->results->http_code = slot->http_code;
457         }
458
459         /* Run callback if appropriate */
460         if (slot->callback_func != NULL) {
461                 slot->callback_func(slot->callback_data);
462         }
463 }
464
465 void finish_all_active_slots(void)
466 {
467         struct active_request_slot *slot = active_queue_head;
468
469         while (slot != NULL)
470                 if (slot->in_use) {
471                         run_active_slot(slot);
472                         slot = active_queue_head;
473                 } else {
474                         slot = slot->next;
475                 }
476 }