Fix HTTP request result processing after slot reuse

Add a way to store the results of an HTTP request when a slot finishes
so the results can be processed after the slot has been reused.

Signed-off-by: Nick Hengeveld <nickh@reactrix.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

http-fetch.c

@@ -375,6 +375,7 @@ static int fetch_index(struct alt_base *repo, unsigned char *sha1)
 
 	FILE *indexfile;
 	struct active_request_slot *slot;
+	static struct slot_results results;
 
 	if (has_pack_index(sha1))
 		return 0;
@@ -393,6 +394,7 @@ static int fetch_index(struct alt_base *repo, unsigned char *sha1)
 			     filename);
 
 	slot = get_active_slot();
+	slot->results = &results;
 	curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 	curl_easy_setopt(slot->curl, CURLOPT_URL, url);
@@ -414,7 +416,7 @@ static int fetch_index(struct alt_base *repo, unsigned char *sha1)
 
 	if (start_active_slot(slot)) {
 		run_active_slot(slot);
-		if (slot->curl_result != CURLE_OK) {
+		if (results.curl_result != CURLE_OK) {
 			fclose(indexfile);
 			return error("Unable to get pack index %s\n%s", url,
 				     curl_errorstr);
@@ -616,6 +618,7 @@ static int fetch_indices(struct alt_base *repo)
 	int i = 0;
 
 	struct active_request_slot *slot;
+	static struct slot_results results;
 
 	if (repo->got_indices)
 		return 0;
@@ -632,15 +635,16 @@ static int fetch_indices(struct alt_base *repo)
 	sprintf(url, "%s/objects/info/packs", repo->base);
 
 	slot = get_active_slot();
+	slot->results = &results;
 	curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 	curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 	if (start_active_slot(slot)) {
 		run_active_slot(slot);
-		if (slot->curl_result != CURLE_OK) {
-			if (slot->http_code == 404 ||
-			    slot->curl_result == CURLE_FILE_COULDNT_READ_FILE) {
+		if (results.curl_result != CURLE_OK) {
+			if (results.http_code == 404 ||
+			    results.curl_result == CURLE_FILE_COULDNT_READ_FILE) {
 				repo->got_indices = 1;
 				free(buffer.buffer);
 				return 0;
@@ -695,6 +699,7 @@ static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
 	struct curl_slist *range_header = NULL;
 
 	struct active_request_slot *slot;
+	static struct slot_results results;
 
 	if (fetch_indices(repo))
 		return -1;
@@ -721,6 +726,7 @@ static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
 			     filename);
 
 	slot = get_active_slot();
+	slot->results = &results;
 	curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 	curl_easy_setopt(slot->curl, CURLOPT_URL, url);
@@ -742,7 +748,7 @@ static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
 
 	if (start_active_slot(slot)) {
 		run_active_slot(slot);
-		if (slot->curl_result != CURLE_OK) {
+		if (results.curl_result != CURLE_OK) {
 			fclose(packfile);
 			return error("Unable to get pack file %s\n%s", url,
 				     curl_errorstr);
@@ -894,6 +900,7 @@ int fetch_ref(char *ref, unsigned char *sha1)
         struct buffer buffer;
 	char *base = alt->base;
 	struct active_request_slot *slot;
+	static struct slot_results results;
         buffer.size = 41;
         buffer.posn = 0;
         buffer.buffer = hex;
@@ -901,13 +908,14 @@ int fetch_ref(char *ref, unsigned char *sha1)
         
 	url = quote_ref_url(base, ref);
 	slot = get_active_slot();
+	slot->results = &results;
 	curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 	curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 	if (start_active_slot(slot)) {
 		run_active_slot(slot);
-		if (slot->curl_result != CURLE_OK)
+		if (results.curl_result != CURLE_OK)
 			return error("Couldn't get %s for %s\n%s",
 				     url, ref, curl_errorstr);
 	} else {

http.c

@@ -335,6 +335,7 @@ struct active_request_slot *get_active_slot(void)
 	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);
@@ -421,7 +422,13 @@ static void finish_active_slot(struct active_request_slot *slot)
         active_requests--;
         slot->in_use = 0;
         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);

http.h

@@ -22,6 +22,12 @@
 #define NO_CURL_EASY_DUPHANDLE
 #endif
 
+struct slot_results
+{
+	CURLcode curl_result;
+	long http_code;
+};
+
 struct active_request_slot
 {
 	CURL *curl;
@@ -29,6 +35,7 @@ struct active_request_slot
 	int in_use;
 	CURLcode curl_result;
 	long http_code;
+	struct slot_results *results;
 	void *callback_data;
 	void (*callback_func)(void *data);
 	struct active_request_slot *next;