fetch.c: do not call process_tree() from process_tree().
[git/git.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 }