[thirdparty/git.git] / http.c

#include "http.h"

int data_received;
int active_requests = 0;

#ifdef USE_CURL_MULTI
int max_requests = -1;
CURLM *curlm;
#endif
#ifndef NO_CURL_EASY_DUPHANDLE
CURL *curl_default;
#endif
char curl_errorstr[CURL_ERROR_SIZE];

int curl_ssl_verify = -1;
char *ssl_cert = NULL;
#if LIBCURL_VERSION_NUM >= 0x070902
char *ssl_key = NULL;
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
char *ssl_capath = NULL;
#endif
char *ssl_cainfo = NULL;
long curl_low_speed_limit = -1;
long curl_low_speed_time = -1;

struct curl_slist *pragma_header;
struct curl_slist *no_range_header;

struct active_request_slot *active_queue_head = NULL;

size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
			   struct buffer *buffer)
{
	size_t size = eltsize * nmemb;
	if (size > buffer->size - buffer->posn)
		size = buffer->size - buffer->posn;
	memcpy(ptr, buffer->buffer + buffer->posn, size);
	buffer->posn += size;
	return size;
}

size_t fwrite_buffer(const void *ptr, size_t eltsize,
			    size_t nmemb, struct buffer *buffer)
{
	size_t size = eltsize * nmemb;
	if (size > buffer->size - buffer->posn) {
		buffer->size = buffer->size * 3 / 2;
		if (buffer->size < buffer->posn + size)
			buffer->size = buffer->posn + size;
		buffer->buffer = xrealloc(buffer->buffer, buffer->size);
	}
	memcpy(buffer->buffer + buffer->posn, ptr, size);
	buffer->posn += size;
	data_received++;
	return size;
}

size_t fwrite_null(const void *ptr, size_t eltsize,
			  size_t nmemb, struct buffer *buffer)
{
	data_received++;
	return eltsize * nmemb;
}

static void finish_active_slot(struct active_request_slot *slot);

#ifdef USE_CURL_MULTI
static void process_curl_messages(void)
{
	int num_messages;
	struct active_request_slot *slot;
	CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);

	while (curl_message != NULL) {
		if (curl_message->msg == CURLMSG_DONE) {
			int curl_result = curl_message->data.result;
			slot = active_queue_head;
			while (slot != NULL &&
			       slot->curl != curl_message->easy_handle)
				slot = slot->next;
			if (slot != NULL) {
				curl_multi_remove_handle(curlm, slot->curl);
				slot->curl_result = curl_result;
				finish_active_slot(slot);
			} else {
				fprintf(stderr, "Received DONE message for unknown request!\n");
			}
		} else {
			fprintf(stderr, "Unknown CURL message received: %d\n",
				(int)curl_message->msg);
		}
		curl_message = curl_multi_info_read(curlm, &num_messages);
	}
}
#endif

static int http_options(const char *var, const char *value)
{
	if (!strcmp("http.sslverify", var)) {
		if (curl_ssl_verify == -1) {
			curl_ssl_verify = git_config_bool(var, value);
		}
		return 0;
	}

	if (!strcmp("http.sslcert", var)) {
		if (ssl_cert == NULL) {
			ssl_cert = xmalloc(strlen(value)+1);
			strcpy(ssl_cert, value);
		}
		return 0;
	}
#if LIBCURL_VERSION_NUM >= 0x070902
	if (!strcmp("http.sslkey", var)) {
		if (ssl_key == NULL) {
			ssl_key = xmalloc(strlen(value)+1);
			strcpy(ssl_key, value);
		}
		return 0;
	}
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
	if (!strcmp("http.sslcapath", var)) {
		if (ssl_capath == NULL) {
			ssl_capath = xmalloc(strlen(value)+1);
			strcpy(ssl_capath, value);
		}
		return 0;
	}
#endif
	if (!strcmp("http.sslcainfo", var)) {
		if (ssl_cainfo == NULL) {
			ssl_cainfo = xmalloc(strlen(value)+1);
			strcpy(ssl_cainfo, value);
		}
		return 0;
	}

#ifdef USE_CURL_MULTI	
	if (!strcmp("http.maxrequests", var)) {
		if (max_requests == -1)
			max_requests = git_config_int(var, value);
		return 0;
	}
#endif

	if (!strcmp("http.lowspeedlimit", var)) {
		if (curl_low_speed_limit == -1)
			curl_low_speed_limit = (long)git_config_int(var, value);
		return 0;
	}
	if (!strcmp("http.lowspeedtime", var)) {
		if (curl_low_speed_time == -1)
			curl_low_speed_time = (long)git_config_int(var, value);
		return 0;
	}

	/* Fall back on the default ones */
	return git_default_config(var, value);
}

static CURL* get_curl_handle(void)
{
	CURL* result = curl_easy_init();

	curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
#if LIBCURL_VERSION_NUM >= 0x070907
	curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
#endif

	if (ssl_cert != NULL)
		curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
#if LIBCURL_VERSION_NUM >= 0x070902
	if (ssl_key != NULL)
		curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
	if (ssl_capath != NULL)
		curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
#endif
	if (ssl_cainfo != NULL)
		curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
	curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);

	if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
		curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
				 curl_low_speed_limit);
		curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
				 curl_low_speed_time);
	}

	curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);

	if (getenv("GIT_CURL_VERBOSE"))
		curl_easy_setopt(result, CURLOPT_VERBOSE, 1);

	return result;
}

void http_init(void)
{
	char *low_speed_limit;
	char *low_speed_time;

	curl_global_init(CURL_GLOBAL_ALL);

	pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
	no_range_header = curl_slist_append(no_range_header, "Range:");

#ifdef USE_CURL_MULTI
	{
		char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
		if (http_max_requests != NULL)
			max_requests = atoi(http_max_requests);
	}

	curlm = curl_multi_init();
	if (curlm == NULL) {
		fprintf(stderr, "Error creating curl multi handle.\n");
		exit(1);
	}
#endif

	if (getenv("GIT_SSL_NO_VERIFY"))
		curl_ssl_verify = 0;

	ssl_cert = getenv("GIT_SSL_CERT");
#if LIBCURL_VERSION_NUM >= 0x070902
	ssl_key = getenv("GIT_SSL_KEY");
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
	ssl_capath = getenv("GIT_SSL_CAPATH");
#endif
	ssl_cainfo = getenv("GIT_SSL_CAINFO");

	low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
	if (low_speed_limit != NULL)
		curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
	low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
	if (low_speed_time != NULL)
		curl_low_speed_time = strtol(low_speed_time, NULL, 10);

	git_config(http_options);

	if (curl_ssl_verify == -1)
		curl_ssl_verify = 1;

#ifdef USE_CURL_MULTI
	if (max_requests < 1)
		max_requests = DEFAULT_MAX_REQUESTS;
#endif

#ifndef NO_CURL_EASY_DUPHANDLE
	curl_default = get_curl_handle();
#endif
}

void http_cleanup(void)
{
	struct active_request_slot *slot = active_queue_head;
#ifdef USE_CURL_MULTI
	char *wait_url;
#endif

	while (slot != NULL) {
#ifdef USE_CURL_MULTI
		if (slot->in_use) {
			curl_easy_getinfo(slot->curl,
					  CURLINFO_EFFECTIVE_URL,
					  &wait_url);
			fprintf(stderr, "Waiting for %s\n", wait_url);
			run_active_slot(slot);
		}
#endif
		if (slot->curl != NULL)
			curl_easy_cleanup(slot->curl);
		slot = slot->next;
	}

#ifndef NO_CURL_EASY_DUPHANDLE
	curl_easy_cleanup(curl_default);
#endif

#ifdef USE_CURL_MULTI
	curl_multi_cleanup(curlm);
#endif
	curl_global_cleanup();
	
}

struct active_request_slot *get_active_slot(void)
{
	struct active_request_slot *slot = active_queue_head;
	struct active_request_slot *newslot;

#ifdef USE_CURL_MULTI
	int num_transfers;

	/* Wait for a slot to open up if the queue is full */
	while (active_requests >= max_requests) {
		curl_multi_perform(curlm, &num_transfers);
		if (num_transfers < active_requests) {
			process_curl_messages();
		}
	}
#endif

	while (slot != NULL && slot->in_use) {
		slot = slot->next;
	}
	if (slot == NULL) {
		newslot = xmalloc(sizeof(*newslot));
		newslot->curl = NULL;
		newslot->in_use = 0;
		newslot->next = NULL;

		slot = active_queue_head;
		if (slot == NULL) {
			active_queue_head = newslot;
		} else {
			while (slot->next != NULL) {
				slot = slot->next;
			}
			slot->next = newslot;
		}
		slot = newslot;
	}

	if (slot->curl == NULL) {
#ifdef NO_CURL_EASY_DUPHANDLE
		slot->curl = get_curl_handle();
#else
		slot->curl = curl_easy_duphandle(curl_default);
#endif
	}

	active_requests++;
	slot->in_use = 1;
	slot->local = NULL;
	slot->results = NULL;
	slot->callback_data = NULL;
	slot->callback_func = NULL;
	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
	curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);

	return slot;
}

int start_active_slot(struct active_request_slot *slot)
{
#ifdef USE_CURL_MULTI
	CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);

	if (curlm_result != CURLM_OK &&
	    curlm_result != CURLM_CALL_MULTI_PERFORM) {
		active_requests--;
		slot->in_use = 0;
		return 0;
	}
#endif
	return 1;
}

#ifdef USE_CURL_MULTI
void step_active_slots(void)
{
	int num_transfers;
	CURLMcode curlm_result;

	do {
		curlm_result = curl_multi_perform(curlm, &num_transfers);
	} while (curlm_result == CURLM_CALL_MULTI_PERFORM);
	if (num_transfers < active_requests) {
		process_curl_messages();
		fill_active_slots();
	}
}
#endif

void run_active_slot(struct active_request_slot *slot)
{
#ifdef USE_CURL_MULTI
	long last_pos = 0;
	long current_pos;
	fd_set readfds;
	fd_set writefds;
	fd_set excfds;
	int max_fd;
	struct timeval select_timeout;

	while (slot->in_use) {
		data_received = 0;
		step_active_slots();

		if (!data_received && slot->local != NULL) {
			current_pos = ftell(slot->local);
			if (current_pos > last_pos)
				data_received++;
			last_pos = current_pos;
		}

		if (slot->in_use && !data_received) {
			max_fd = 0;
			FD_ZERO(&readfds);
			FD_ZERO(&writefds);
			FD_ZERO(&excfds);
			select_timeout.tv_sec = 0;
			select_timeout.tv_usec = 50000;
			select(max_fd, &readfds, &writefds,
			       &excfds, &select_timeout);
		}
	}
#else
	while (slot->in_use) {
		slot->curl_result = curl_easy_perform(slot->curl);
		finish_active_slot(slot);
	}
#endif
}

static void closedown_active_slot(struct active_request_slot *slot)
{
        active_requests--;
        slot->in_use = 0;
}

void release_active_slot(struct active_request_slot *slot)
{
	closedown_active_slot(slot);
	if (slot->curl) {
		curl_multi_remove_handle(curlm, slot->curl);
		curl_easy_cleanup(slot->curl);
		slot->curl = NULL;
	}
	fill_active_slots();
}

static void finish_active_slot(struct active_request_slot *slot)
{
	closedown_active_slot(slot);
        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);

	/* Store slot results so they can be read after the slot is reused */
	if (slot->results != NULL) {
		slot->results->curl_result = slot->curl_result;
		slot->results->http_code = slot->http_code;
	}

        /* Run callback if appropriate */
        if (slot->callback_func != NULL) {
                slot->callback_func(slot->callback_data);
        }
}

void finish_all_active_slots(void)
{
	struct active_request_slot *slot = active_queue_head;

	while (slot != NULL)
		if (slot->in_use) {
			run_active_slot(slot);
			slot = active_queue_head;
		} else {
			slot = slot->next;
		}
}
Commit	Line	Data
29508e1e NH	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
11979b98 JH	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
7982d74e MW	195	if (getenv("GIT_CURL_VERBOSE"))
	196	curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
	197
11979b98 JH	198	return result;
	199	}
	200
29508e1e NH	201	void http_init(void)
	202	{
	203	char *low_speed_limit;
	204	char *low_speed_time;
	205
	206	curl_global_init(CURL_GLOBAL_ALL);
	207
	208	pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
	209	no_range_header = curl_slist_append(no_range_header, "Range:");
	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;
29508e1e NH	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
29508e1e NH	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;
c8568e13	341	slot->results = NULL;
29508e1e NH	342	slot->callback_data = NULL;
	343	slot->callback_func = NULL;
	344	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
	345	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
	346	curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
	347
	348	return slot;
	349	}
	350
	351	int start_active_slot(struct active_request_slot *slot)
	352	{
	353	#ifdef USE_CURL_MULTI
	354	CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
	355
	356	if (curlm_result != CURLM_OK &&
	357	curlm_result != CURLM_CALL_MULTI_PERFORM) {
	358	active_requests--;
	359	slot->in_use = 0;
	360	return 0;
	361	}
	362	#endif
	363	return 1;
	364	}
	365
	366	#ifdef USE_CURL_MULTI
	367	void step_active_slots(void)
	368	{
	369	int num_transfers;
	370	CURLMcode curlm_result;
	371
	372	do {
	373	curlm_result = curl_multi_perform(curlm, &num_transfers);
	374	} while (curlm_result == CURLM_CALL_MULTI_PERFORM);
	375	if (num_transfers < active_requests) {
	376	process_curl_messages();
	377	fill_active_slots();
	378	}
	379	}
	380	#endif
	381
	382	void run_active_slot(struct active_request_slot *slot)
	383	{
	384	#ifdef USE_CURL_MULTI
	385	long last_pos = 0;
	386	long current_pos;
	387	fd_set readfds;
	388	fd_set writefds;
	389	fd_set excfds;
	390	int max_fd;
	391	struct timeval select_timeout;
	392
	393	while (slot->in_use) {
	394	data_received = 0;
	395	step_active_slots();
	396
	397	if (!data_received && slot->local != NULL) {
	398	current_pos = ftell(slot->local);
	399	if (current_pos > last_pos)
	400	data_received++;
	401	last_pos = current_pos;
	402	}
	403
	404	if (slot->in_use && !data_received) {
	405	max_fd = 0;
406	FD_ZERO(&readfds);
407	FD_ZERO(&writefds);
408	FD_ZERO(&excfds);
409	select_timeout.tv_sec = 0;
410	select_timeout.tv_usec = 50000;
411	select(max_fd, &readfds, &writefds,
412	&excfds, &select_timeout);
413	}
414	}
415	#else
416	while (slot->in_use) {
417	slot->curl_result = curl_easy_perform(slot->curl);
418	finish_active_slot(slot);
419	}
420	#endif
421	}
422
53f31389	423	static void closedown_active_slot(struct active_request_slot *slot)
29508e1e NH	424	{
	425	active_requests--;
	426	slot->in_use = 0;
53f31389 MW	427	}
	428
	429	void release_active_slot(struct active_request_slot *slot)
	430	{
	431	closedown_active_slot(slot);
	432	if (slot->curl) {
	433	curl_multi_remove_handle(curlm, slot->curl);
	434	curl_easy_cleanup(slot->curl);
	435	slot->curl = NULL;
	436	}
	437	fill_active_slots();
	438	}
	439
	440	static void finish_active_slot(struct active_request_slot *slot)
	441	{
	442	closedown_active_slot(slot);
29508e1e	443	curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
c8568e13 NH	444
	445	/* Store slot results so they can be read after the slot is reused */
	446	if (slot->results != NULL) {
	447	slot->results->curl_result = slot->curl_result;
	448	slot->results->http_code = slot->http_code;
	449	}
	450
29508e1e NH	451	/* Run callback if appropriate */
	452	if (slot->callback_func != NULL) {
	453	slot->callback_func(slot->callback_data);
	454	}
	455	}
	456
	457	void finish_all_active_slots(void)
	458	{
	459	struct active_request_slot *slot = active_queue_head;
	460
	461	while (slot != NULL)
	462	if (slot->in_use) {
	463	run_active_slot(slot);
	464	slot = active_queue_head;
	465	} else {
	466	slot = slot->next;
	467	}
	468	}