From f55c756c17b9567a643c7f779c65433f3c6eb9ca Mon Sep 17 00:00:00 2001
From: zmike <michael.blumenkrantz@gmail.com>
Date: Fri, 2 Jan 2015 23:21:34 -0500
Subject: [PATCH] curl usage better accounts for timeouts

curl is dumb. it needs to poll its own fd for data, it gets confused with its own timeouts, and sometimes it forgets that it's supposed to be doing anything.

this fixes:

* connection timeout processing
* connection data processing order

also curl_multi_timeout calls are now done from a single function to handle all of this stupidness in one place

maybe backport after more testing...
---
 src/lib/ecore_con/ecore_con_url.c | 49 +++++++++++++++++++++++++++----
 1 file changed, 43 insertions(+), 6 deletions(-)

diff --git a/src/lib/ecore_con/ecore_con_url.c b/src/lib/ecore_con/ecore_con_url.c
index 2c5dc0ce5f..11a2abce12 100644
--- a/src/lib/ecore_con/ecore_con_url.c
+++ b/src/lib/ecore_con/ecore_con_url.c
@@ -276,6 +276,7 @@ static Eina_List *_fd_hd_list = NULL;
 static int _init_count = 0;
 static Ecore_Timer *_curl_timer = NULL;
 static Eina_Bool pipelining = EINA_FALSE;
+static long last_ms = -1;
 
 static Ecore_Con_Curl *_c = NULL;
 static Eina_Bool _c_fail = EINA_FALSE;
@@ -343,7 +344,8 @@ _c_init(void)
         goto error;
      }
    _c->curl_multi_timeout(_c->_curlm, &ms);
-   if ((ms >= CURL_MIN_TIMEOUT) || (ms <= 0)) ms = CURL_MIN_TIMEOUT;
+   if ((ms >= CURL_MIN_TIMEOUT) || (ms < 0)) ms = CURL_MIN_TIMEOUT;
+   last_ms = ms;
    _curl_timer = ecore_timer_add((double)ms / 1000.0,
                                  _ecore_con_url_timer, NULL);
    ecore_timer_freeze(_curl_timer);
@@ -1519,20 +1521,53 @@ _ecore_con_url_curl_clear(void)
      ecore_main_fd_handler_del(fdh);
    EINA_LIST_FREE(_url_con_list, url_con)
      _ecore_con_url_multi_remove(url_con);
+   last_ms = -1;
+}
+
+static Eina_Bool
+_ecore_con_url_do_multi_timeout(long *retms)
+{
+   long ms = 0;
+   int ret;
+
+   while (!ms)
+     {
+        ret = _c->curl_multi_timeout(_c->_curlm, &ms);
+        *retms = ms;
+        if ((last_ms > 0) && (ms < 0))
+          ERR("curl_multi_perform() timeout");
+        else if (ms <= 0)
+          {
+             last_ms = ms;
+             _ecore_con_url_timer(NULL);
+             DBG("multiperform is still running: timeout: %ld", ms);
+             return EINA_TRUE;
+          }
+        else if ((ret <= 0) && (ms > 0)) break;
+        else
+          ERR("curl_multi_perform() failed: %s", _c->curl_multi_strerror(ret));
+        last_ms = ms;
+        _ecore_con_url_curl_clear();
+        ecore_timer_freeze(_curl_timer);
+        return EINA_FALSE;
+     }
+   return EINA_TRUE;
 }
 
 static Eina_Bool
 _ecore_con_url_fd_handler(void *data EINA_UNUSED, Ecore_Fd_Handler *fd_handler EINA_UNUSED)
 {
    Ecore_Fd_Handler *fdh;
-   long ms;
+   long ms = 0;
 
    if (!_c) return ECORE_CALLBACK_CANCEL;
    EINA_LIST_FREE(_fd_hd_list, fdh)
      ecore_main_fd_handler_del(fdh);
-   _c->curl_multi_timeout(_c->_curlm, &ms);
+   if (!_ecore_con_url_do_multi_timeout(&ms)) return EINA_FALSE;
+   last_ms = ms;
    if ((ms >= CURL_MIN_TIMEOUT) || (ms <= 0)) ms = CURL_MIN_TIMEOUT;
    ecore_timer_interval_set(_curl_timer, (double)ms / 1000.0);
+   ecore_timer_reset(_curl_timer);
    _ecore_con_url_timer(NULL);
    return ECORE_CALLBACK_CANCEL;
 }
@@ -1594,6 +1629,7 @@ _ecore_con_url_timer(void *data EINA_UNUSED)
    if (ret == CURLM_CALL_MULTI_PERFORM)
      {
         DBG("curl_multi_perform() again immediately");
+        ecore_timer_interval_set(_curl_timer, 0.000001);
         return ECORE_CALLBACK_RENEW;
      }
    else if (ret != CURLM_OK)
@@ -1604,13 +1640,14 @@ _ecore_con_url_timer(void *data EINA_UNUSED)
      }
    if (still_running)
      {
-        long ms;
+        long ms = 0;
 
         _ecore_con_url_fdset();
-        _c->curl_multi_timeout(_c->_curlm, &ms);
+        if (!_ecore_con_url_do_multi_timeout(&ms)) return EINA_FALSE;
+        last_ms = ms;
         DBG("multiperform is still running: %d, timeout: %ld",
             still_running, ms);
-        if ((ms >= CURL_MIN_TIMEOUT) || (ms <= 0)) ms = CURL_MIN_TIMEOUT;
+        if ((ms >= CURL_MIN_TIMEOUT) || (ms < 0)) ms = CURL_MIN_TIMEOUT;
         ecore_timer_interval_set(_curl_timer, (double)ms / 1000.0);
      }
    else