[GNUnet-SVN] [taler-twister] 02/03: #5337 in proxy: if Web server returns response during upload, curl aborts upload so our proxy should give up on the upload as well and just proceed with the download

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grothoff pushed a commit to branch master
in repository twister.

commit 9ad1ebf8f6b126fdef9a0753305b77f30ebbfa3f
Author: Christian Grothoff <address@hidden>
AuthorDate: Thu Sep 20 20:09:45 2018 +0200

    #5337 in proxy: if Web server returns response during upload, curl aborts 
upload so our proxy should give up on the upload as well and just proceed with 
the download
---
 src/twister/taler-twister-service.c | 57 +++++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 22 deletions(-)

diff --git a/src/twister/taler-twister-service.c 
b/src/twister/taler-twister-service.c
index 5b2f43a..cf931df 100644
--- a/src/twister/taler-twister-service.c
+++ b/src/twister/taler-twister-service.c
@@ -46,7 +46,7 @@
  * easily identify what might fix the issue (until CG can actually
  * reproduce it nicely).
  */
-#define MARCELLO_FIX 1
+#define MARCELLO_FIX 0
 
 /**
  * Log curl error.
@@ -522,7 +522,7 @@ static size_t
 curl_download_cb (void *ptr,
                  size_t size,
                  size_t nmemb,
-                 void* ctx)
+                 void *ctx)
 {
   struct HttpRequest *hr = ctx;
   size_t total = size * nmemb;
@@ -533,16 +533,22 @@ curl_download_cb (void *ptr,
   if ( (REQUEST_STATE_UPLOAD_STARTED == hr->state) ||
        (REQUEST_STATE_UPLOAD_DONE == hr->state) )
   {
-    /* we're still not done with the upload, do not yet
-       start the download, the IO buffer is still full
-       with upload data. */
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Pausing CURL download, waiting for UPLOAD to finish\n");
-    hr->curl_paused = GNUNET_YES;
-    return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
+    /* Web server started with response before we finished
+       the upload.  In this case, current libcurl decides
+       to NOT complete the upload, so we should jump in the
+       state machine to process the download, dropping the
+       rest of the upload.  This should only really happen
+       with uploads without "Expect: 100 Continue" and
+       Web servers responding with an error (i.e. upload
+       not allowed) */
+    hr->state = REQUEST_STATE_DOWNLOAD_STARTED;
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                "Stopping %u byte upload: we are already downloading...\n",
+                (unsigned int) hr->io_len);
+    hr->io_len = 0;
   }
 
- if (REQUEST_STATE_DOWNLOAD_STARTED != hr->state)
+  if (REQUEST_STATE_DOWNLOAD_STARTED != hr->state)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Download callback goes to sleep\n");
@@ -571,6 +577,13 @@ curl_download_cb (void *ptr,
 
 
 /**
+ * Ask cURL for the select() sets and schedule cURL operations.
+ */
+static void
+curl_download_prepare (void);
+
+
+/**
  * cURL callback for uploaded (PUT/POST) data.
  * Copies from our `io_buf` to make it available to cURL.
  *
@@ -592,7 +605,13 @@ curl_upload_cb (void *buf,
 
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Upload cb is working...\n");
-
+  if ( (REQUEST_STATE_UPLOAD_STARTED != hr->state) &&
+       (REQUEST_STATE_UPLOAD_DONE != hr->state) )
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                "Upload cb aborts: we are already downloading...\n");
+    return CURL_READFUNC_ABORT;
+  }
   if ( (0 == hr->io_len) &&
        (REQUEST_STATE_UPLOAD_DONE != hr->state) )
   {
@@ -610,16 +629,11 @@ curl_upload_cb (void *buf,
       curl_easy_pause (hr->curl,
                       CURLPAUSE_CONT);
     }
+    curl_download_prepare ();
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Completed CURL UPLOAD\n");
     return 0; /* upload finished, can now download */
   }
-  if ( (REQUEST_STATE_UPLOAD_STARTED != hr->state) &&
-       (REQUEST_STATE_UPLOAD_DONE != hr->state) )
-  {
-    GNUNET_break (0);
-    return CURL_READFUNC_ABORT;
-  }
   to_copy = GNUNET_MIN (hr->io_len,
                         len);
   GNUNET_memcpy (buf,
@@ -729,6 +743,7 @@ curl_download_prepare ()
   }
 }
 
+
 /**
  * Task that is run when we are ready to receive
  * more data from curl.
@@ -865,6 +880,7 @@ curl_progress_cb (void *clientp,
     curl_easy_pause (hr->curl, CURLPAUSE_CONT);
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Unpausing the download callback\n");
+    curl_download_prepare ();
   }
 #endif
   return CURLE_OK;
@@ -1362,10 +1378,9 @@ create_response (void *cls,
       flip_object (con,
                    hr->json,
                    flip_path_ul);
-
+      /* Existing io_len is enough to accomodate this encoding. */
       json_dumpb (hr->json,
                   hr->io_buf,
-/* Existing io_len is enough to accomodate this encoding.  */
                   hr->io_len,
                   JSON_COMPACT);
 
@@ -1387,10 +1402,9 @@ create_response (void *cls,
       modify_object (con,
                      hr->json,
                      modify_path_ul);
-
+      /* Existing io_len is enough to accomodate this encoding. */
       json_dumpb (hr->json,
                   hr->io_buf,
-/* Existing io_len is enough to accomodate this encoding.  */
                   hr->io_len,
                   JSON_COMPACT);
 
@@ -1632,7 +1646,6 @@ create_response (void *cls,
     curl_easy_setopt (hr->curl,
                       CURLOPT_HTTPHEADER,
                       hr->headers);
-
     curl_download_prepare ();
 
     /* means (?) upload is over.  */

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