Merge branch 'jc/fmt-patch' into next
[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
29 struct active_request_slot *active_queue_head = NULL;
30
31 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
32                            struct buffer *buffer)
33 {
34         size_t size = eltsize * nmemb;
35         if (size > buffer->size - buffer->posn)
36                 size = buffer->size - buffer->posn;
37         memcpy(ptr, buffer->buffer + buffer->posn, size);
38         buffer->posn += size;
39         return size;
40 }
41
42 size_t fwrite_buffer(const void *ptr, size_t eltsize,
43                             size_t nmemb, struct buffer *buffer)
44 {
45         size_t size = eltsize * nmemb;
46         if (size > buffer->size - buffer->posn) {
47                 buffer->size = buffer->size * 3 / 2;
48                 if (buffer->size < buffer->posn + size)
49                         buffer->size = buffer->posn + size;
50                 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
51         }
52         memcpy(buffer->buffer + buffer->posn, ptr, size);
53         buffer->posn += size;
54         data_received++;
55         return size;
56 }
57
58 size_t fwrite_null(const void *ptr, size_t eltsize,
59                           size_t nmemb, struct buffer *buffer)
60 {
61         data_received++;
62         return eltsize * nmemb;
63 }
64
65 static void finish_active_slot(struct active_request_slot *slot);
66
67 #ifdef USE_CURL_MULTI
68 static void process_curl_messages(void)
69 {
70         int num_messages;
71         struct active_request_slot *slot;
72         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
73
74         while (curl_message != NULL) {
75                 if (curl_message->msg == CURLMSG_DONE) {
76                         int curl_result = curl_message->data.result;
77                         slot = active_queue_head;
78                         while (slot != NULL &&
79                                slot->curl != curl_message->easy_handle)
80                                 slot = slot->next;
81                         if (slot != NULL) {
82                                 curl_multi_remove_handle(curlm, slot->curl);
83                                 slot->curl_result = curl_result;
84                                 finish_active_slot(slot);
85                         } else {
86                                 fprintf(stderr, "Received DONE message for unknown request!\n");
87                         }
88                 } else {
89                         fprintf(stderr, "Unknown CURL message received: %d\n",
90                                 (int)curl_message->msg);
91                 }
92                 curl_message = curl_multi_info_read(curlm, &num_messages);
93         }
94 }
95 #endif
96
97 static int http_options(const char *var, const char *value)
98 {
99         if (!strcmp("http.sslverify", var)) {
100                 if (curl_ssl_verify == -1) {
101                         curl_ssl_verify = git_config_bool(var, value);
102                 }
103                 return 0;
104         }
105
106         if (!strcmp("http.sslcert", var)) {
107                 if (ssl_cert == NULL) {
108                         ssl_cert = xmalloc(strlen(value)+1);
109                         strcpy(ssl_cert, value);
110                 }
111                 return 0;
112         }
113 #if LIBCURL_VERSION_NUM >= 0x070902
114         if (!strcmp("http.sslkey", var)) {
115                 if (ssl_key == NULL) {
116                         ssl_key = xmalloc(strlen(value)+1);
117                         strcpy(ssl_key, value);
118                 }
119                 return 0;
120         }
121 #endif
122 #if LIBCURL_VERSION_NUM >= 0x070908
123         if (!strcmp("http.sslcapath", var)) {
124                 if (ssl_capath == NULL) {
125                         ssl_capath = xmalloc(strlen(value)+1);
126                         strcpy(ssl_capath, value);
127                 }
128                 return 0;
129         }
130 #endif
131         if (!strcmp("http.sslcainfo", var)) {
132                 if (ssl_cainfo == NULL) {
133                         ssl_cainfo = xmalloc(strlen(value)+1);
134                         strcpy(ssl_cainfo, value);
135                 }
136                 return 0;
137         }
138
139 #ifdef USE_CURL_MULTI   
140         if (!strcmp("http.maxrequests", var)) {
141                 if (max_requests == -1)
142                         max_requests = git_config_int(var, value);
143                 return 0;
144         }
145 #endif
146
147         if (!strcmp("http.lowspeedlimit", var)) {
148                 if (curl_low_speed_limit == -1)
149                         curl_low_speed_limit = (long)git_config_int(var, value);
150                 return 0;
151         }
152         if (!strcmp("http.lowspeedtime", var)) {
153                 if (curl_low_speed_time == -1)
154                         curl_low_speed_time = (long)git_config_int(var, value);
155                 return 0;
156         }
157
158         /* Fall back on the default ones */
159         return git_default_config(var, value);
160 }
161
162 static CURL* get_curl_handle(void)
163 {
164         CURL* result = curl_easy_init();
165
166         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
167 #if LIBCURL_VERSION_NUM >= 0x070907
168         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
169 #endif
170
171         if (ssl_cert != NULL)
172                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
173 #if LIBCURL_VERSION_NUM >= 0x070902
174         if (ssl_key != NULL)
175                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
176 #endif
177 #if LIBCURL_VERSION_NUM >= 0x070908
178         if (ssl_capath != NULL)
179                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
180 #endif
181         if (ssl_cainfo != NULL)
182                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
183         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
184
185         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
186                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
187                                  curl_low_speed_limit);
188                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
189                                  curl_low_speed_time);
190         }
191
192         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
193
194         if (getenv("GIT_CURL_VERBOSE"))
195                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
196
197         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
198
199         return result;
200 }
201
202 void http_init(void)
203 {
204         char *low_speed_limit;
205         char *low_speed_time;
206
207         curl_global_init(CURL_GLOBAL_ALL);
208
209         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
210
211 #ifdef USE_CURL_MULTI
212         {
213                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
214                 if (http_max_requests != NULL)
215                         max_requests = atoi(http_max_requests);
216         }
217
218         curlm = curl_multi_init();
219         if (curlm == NULL) {
220                 fprintf(stderr, "Error creating curl multi handle.\n");
221                 exit(1);
222         }
223 #endif
224
225         if (getenv("GIT_SSL_NO_VERIFY"))
226                 curl_ssl_verify = 0;
227
228         ssl_cert = getenv("GIT_SSL_CERT");
229 #if LIBCURL_VERSION_NUM >= 0x070902
230         ssl_key = getenv("GIT_SSL_KEY");
231 #endif
232 #if LIBCURL_VERSION_NUM >= 0x070908
233         ssl_capath = getenv("GIT_SSL_CAPATH");
234 #endif
235         ssl_cainfo = getenv("GIT_SSL_CAINFO");
236
237         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
238         if (low_speed_limit != NULL)
239                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
240         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
241         if (low_speed_time != NULL)
242                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
243
244         git_config(http_options);
245
246         if (curl_ssl_verify == -1)
247                 curl_ssl_verify = 1;
248
249 #ifdef USE_CURL_MULTI
250         if (max_requests < 1)
251                 max_requests = DEFAULT_MAX_REQUESTS;
252 #endif
253
254 #ifndef NO_CURL_EASY_DUPHANDLE
255         curl_default = get_curl_handle();
256 #endif
257 }
258
259 void http_cleanup(void)
260 {
261         struct active_request_slot *slot = active_queue_head;
262 #ifdef USE_CURL_MULTI
263         char *wait_url;
264 #endif
265
266         while (slot != NULL) {
267 #ifdef USE_CURL_MULTI
268                 if (slot->in_use) {
269                         curl_easy_getinfo(slot->curl,
270                                           CURLINFO_EFFECTIVE_URL,
271                                           &wait_url);
272                         fprintf(stderr, "Waiting for %s\n", wait_url);
273                         run_active_slot(slot);
274                 }
275 #endif
276                 if (slot->curl != NULL)
277                         curl_easy_cleanup(slot->curl);
278                 slot = slot->next;
279         }
280
281 #ifndef NO_CURL_EASY_DUPHANDLE
282         curl_easy_cleanup(curl_default);
283 #endif
284
285 #ifdef USE_CURL_MULTI
286         curl_multi_cleanup(curlm);
287 #endif
288         curl_global_cleanup();
289         
290 }
291
292 struct active_request_slot *get_active_slot(void)
293 {
294         struct active_request_slot *slot = active_queue_head;
295         struct active_request_slot *newslot;
296
297 #ifdef USE_CURL_MULTI
298         int num_transfers;
299
300         /* Wait for a slot to open up if the queue is full */
301         while (active_requests >= max_requests) {
302                 curl_multi_perform(curlm, &num_transfers);
303                 if (num_transfers < active_requests) {
304                         process_curl_messages();
305                 }
306         }
307 #endif
308
309         while (slot != NULL && slot->in_use) {
310                 slot = slot->next;
311         }
312         if (slot == NULL) {
313                 newslot = xmalloc(sizeof(*newslot));
314                 newslot->curl = NULL;
315                 newslot->in_use = 0;
316                 newslot->next = NULL;
317
318                 slot = active_queue_head;
319                 if (slot == NULL) {
320                         active_queue_head = newslot;
321                 } else {
322                         while (slot->next != NULL) {
323                                 slot = slot->next;
324                         }
325                         slot->next = newslot;
326                 }
327                 slot = newslot;
328         }
329
330         if (slot->curl == NULL) {
331 #ifdef NO_CURL_EASY_DUPHANDLE
332                 slot->curl = get_curl_handle();
333 #else
334                 slot->curl = curl_easy_duphandle(curl_default);
335 #endif
336         }
337
338         active_requests++;
339         slot->in_use = 1;
340         slot->local = NULL;
341         slot->results = NULL;
342         slot->finished = NULL;
343         slot->callback_data = NULL;
344         slot->callback_func = NULL;
345         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
346         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
347         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
348         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
349         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
350         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
351         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
352         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
353
354         return slot;
355 }
356
357 int start_active_slot(struct active_request_slot *slot)
358 {
359 #ifdef USE_CURL_MULTI
360         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
361
362         if (curlm_result != CURLM_OK &&
363             curlm_result != CURLM_CALL_MULTI_PERFORM) {
364                 active_requests--;
365                 slot->in_use = 0;
366                 return 0;
367         }
368 #endif
369         return 1;
370 }
371
372 #ifdef USE_CURL_MULTI
373 void step_active_slots(void)
374 {
375         int num_transfers;
376         CURLMcode curlm_result;
377
378         do {
379                 curlm_result = curl_multi_perform(curlm, &num_transfers);
380         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
381         if (num_transfers < active_requests) {
382                 process_curl_messages();
383                 fill_active_slots();
384         }
385 }
386 #endif
387
388 void run_active_slot(struct active_request_slot *slot)
389 {
390 #ifdef USE_CURL_MULTI
391         long last_pos = 0;
392         long current_pos;
393         fd_set readfds;
394         fd_set writefds;
395         fd_set excfds;
396         int max_fd;
397         struct timeval select_timeout;
398         int finished = 0;
399
400         slot->finished = &finished;
401         while (!finished) {
402                 data_received = 0;
403                 step_active_slots();
404
405                 if (!data_received && slot->local != NULL) {
406                         current_pos = ftell(slot->local);
407                         if (current_pos > last_pos)
408                                 data_received++;
409                         last_pos = current_pos;
410                 }
411
412                 if (slot->in_use && !data_received) {
413                         max_fd = 0;
414                         FD_ZERO(&readfds);
415                         FD_ZERO(&writefds);
416                         FD_ZERO(&excfds);
417                         select_timeout.tv_sec = 0;
418                         select_timeout.tv_usec = 50000;
419                         select(max_fd, &readfds, &writefds,
420                                &excfds, &select_timeout);
421                 }
422         }
423 #else
424         while (slot->in_use) {
425                 slot->curl_result = curl_easy_perform(slot->curl);
426                 finish_active_slot(slot);
427         }
428 #endif
429 }
430
431 static void closedown_active_slot(struct active_request_slot *slot)
432 {
433         active_requests--;
434         slot->in_use = 0;
435 }
436
437 void release_active_slot(struct active_request_slot *slot)
438 {
439         closedown_active_slot(slot);
440         if (slot->curl) {
441                 curl_multi_remove_handle(curlm, slot->curl);
442                 curl_easy_cleanup(slot->curl);
443                 slot->curl = NULL;
444         }
445         fill_active_slots();
446 }
447
448 static void finish_active_slot(struct active_request_slot *slot)
449 {
450         closedown_active_slot(slot);
451         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
452
453         if (slot->finished != NULL)
454                 (*slot->finished) = 1;
455
456         /* Store slot results so they can be read after the slot is reused */
457         if (slot->results != NULL) {
458                 slot->results->curl_result = slot->curl_result;
459                 slot->results->http_code = slot->http_code;
460         }
461
462         /* Run callback if appropriate */
463         if (slot->callback_func != NULL) {
464                 slot->callback_func(slot->callback_data);
465         }
466 }
467
468 void finish_all_active_slots(void)
469 {
470         struct active_request_slot *slot = active_queue_head;
471
472         while (slot != NULL)
473                 if (slot->in_use) {
474                         run_active_slot(slot);
475                         slot = active_queue_head;
476                 } else {
477                         slot = slot->next;
478                 }
479 }