Support for HTTP transfer timeouts based on transfer speed

Add configuration settings to abort HTTP requests if the transfer rate
drops below a threshold for a specified length of time.  Environment
variables override config file settings.

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

diff --git a/http-fetch.c b/http-fetch.c
index efa6e82..a7dc2cc 100644 (file)
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -100,6 +100,8 @@ static char *ssl_key = NULL;
 static char *ssl_capath = NULL;
 #endif
 static char *ssl_cainfo = NULL;
+static long curl_low_speed_limit = -1;
+static long curl_low_speed_time = -1;
 
 struct buffer
 {
@@ -158,6 +160,17 @@ static int http_options(const char *var, const char *value)
        }
 #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);
 }
@@ -246,6 +259,13 @@ static CURL* get_curl_handle(void)
                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);
+       }
+
        return result;
 }
 
@@ -1177,6 +1197,8 @@ int main(int argc, char **argv)
        char *url;
        int arg = 1;
        struct active_request_slot *slot;
+       char *low_speed_limit;
+       char *low_speed_time;
 
        while (arg < argc && argv[arg][0] == '-') {
                if (argv[arg][1] == 't') {
@@ -1232,6 +1254,13 @@ int main(int argc, char **argv)
 #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)