[taler-exchange] branch master updated: fix #7049: immediate restart of MHD when already running

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grothoff pushed a commit to branch master
in repository exchange.

The following commit(s) were added to refs/heads/master by this push:
     new c13810ba fix #7049: immediate restart of MHD when already running
c13810ba is described below

commit c13810ba2c43a63504269c646b438c2fd157d4ff
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Wed Oct 20 16:01:11 2021 +0200

    fix #7049: immediate restart of MHD when already running
---
 src/bank-lib/bank_api_credit.c   |  11 +++-
 src/bank-lib/bank_api_debit.c    |   9 +++-
 src/bank-lib/fakebank.c          | 114 +++++++++++++++++++++++++--------------
 src/include/taler_fakebank_lib.h |   6 +--
 4 files changed, 94 insertions(+), 46 deletions(-)

diff --git a/src/bank-lib/bank_api_credit.c b/src/bank-lib/bank_api_credit.c
index 91fbe506..eff2ad97 100644
--- a/src/bank-lib/bank_api_credit.c
+++ b/src/bank-lib/bank_api_credit.c
@@ -29,6 +29,13 @@
 #include "taler_signatures.h"
 
 
+/**
+ * How much longer than the application-specified timeout
+ * do we wait (giving the server a chance to respond)?
+ */
+#define GRACE_PERIOD_MS 1000
+
+
 /**
  * @brief A /history/incoming Handle
  */
@@ -66,7 +73,7 @@ struct TALER_BANK_CreditHistoryHandle
  *         were set,
  *         #GNUNET_SYSERR if there was a protocol violation in @a history
  */
-static int
+static enum GNUNET_GenericReturnValue
 parse_account_history (struct TALER_BANK_CreditHistoryHandle *hh,
                        const json_t *history)
 {
@@ -305,7 +312,7 @@ TALER_BANK_credit_history (struct GNUNET_CURL_Context *ctx,
     GNUNET_break (CURLE_OK ==
                   curl_easy_setopt (eh,
                                     CURLOPT_TIMEOUT_MS,
-                                    (long) tms));
+                                    (long) tms + GRACE_PERIOD_MS));
   }
   hh->job = GNUNET_CURL_job_add2 (ctx,
                                   eh,
diff --git a/src/bank-lib/bank_api_debit.c b/src/bank-lib/bank_api_debit.c
index 8cca0cc5..339dfef4 100644
--- a/src/bank-lib/bank_api_debit.c
+++ b/src/bank-lib/bank_api_debit.c
@@ -29,6 +29,13 @@
 #include "taler_signatures.h"
 
 
+/**
+ * How much longer than the application-specified timeout
+ * do we wait (giving the server a chance to respond)?
+ */
+#define GRACE_PERIOD_MS 1000
+
+
 /**
  * @brief A /history/outgoing Handle
  */
@@ -307,7 +314,7 @@ TALER_BANK_debit_history (struct GNUNET_CURL_Context *ctx,
     GNUNET_break (CURLE_OK ==
                   curl_easy_setopt (eh,
                                     CURLOPT_TIMEOUT_MS,
-                                    (long) tms));
+                                    (long) tms + GRACE_PERIOD_MS));
   }
   hh->job = GNUNET_CURL_job_add2 (ctx,
                                   eh,
diff --git a/src/bank-lib/fakebank.c b/src/bank-lib/fakebank.c
index 2a53419b..24878bdd 100644
--- a/src/bank-lib/fakebank.c
+++ b/src/bank-lib/fakebank.c
@@ -425,6 +425,11 @@ struct TALER_FAKEBANK_Handle
    */
   bool in_shutdown;
 
+  /**
+   * Should we run MHD immediately again?
+   */
+  bool mhd_again;
+
 #if EPOLL_SUPPORT
   /**
    * Boxed @e mhd_fd.
@@ -474,6 +479,7 @@ lp_trigger (struct LongPoller *lp,
                                lp);
   MHD_resume_connection (lp->conn);
   GNUNET_free (lp);
+  h->mhd_again = true;
   if (NULL != h->mhd_task)
     GNUNET_SCHEDULER_cancel (h->mhd_task);
   h->mhd_task =
@@ -508,12 +514,8 @@ lp_expiration_thread (void *cls)
     {
       GNUNET_assert (lp ==
                      GNUNET_CONTAINER_heap_remove_root (h->lp_heap));
-      GNUNET_assert (0 ==
-                     pthread_mutex_lock (&h->big_lock));
       lp_trigger (lp,
                   h);
-      GNUNET_assert (0 ==
-                     pthread_mutex_unlock (&h->big_lock));
       lp = GNUNET_CONTAINER_heap_peek (h->lp_heap);
     }
     if (NULL != lp)
@@ -674,7 +676,7 @@ check_log (struct TALER_FAKEBANK_Handle *h)
 }
 
 
-int
+enum GNUNET_GenericReturnValue
 TALER_FAKEBANK_check_debit (struct TALER_FAKEBANK_Handle *h,
                             const struct TALER_Amount *want_amount,
                             const char *want_debit,
@@ -722,7 +724,7 @@ TALER_FAKEBANK_check_debit (struct TALER_FAKEBANK_Handle *h,
 }
 
 
-int
+enum GNUNET_GenericReturnValue
 TALER_FAKEBANK_check_credit (struct TALER_FAKEBANK_Handle *h,
                              const struct TALER_Amount *want_amount,
                              const char *want_debit,
@@ -866,36 +868,6 @@ post_transaction (struct TALER_FAKEBANK_Handle *h,
                                   ca->in_tail,
                                   old);
   }
-  {
-    struct LongPoller *nxt;
-
-    for (struct LongPoller *lp = debit_acc->lp_head;
-         NULL != lp;
-         lp = nxt)
-    {
-      nxt = lp->next;
-      if (LP_DEBIT == lp->type)
-      {
-        GNUNET_assert (lp ==
-                       GNUNET_CONTAINER_heap_remove_node (lp->hn));
-        lp_trigger (lp,
-                    h);
-      }
-    }
-    for (struct LongPoller *lp = credit_acc->lp_head;
-         NULL != lp;
-         lp = nxt)
-    {
-      nxt = lp->next;
-      if (LP_CREDIT == lp->type)
-      {
-        GNUNET_assert (lp ==
-                       GNUNET_CONTAINER_heap_remove_node (lp->hn));
-        lp_trigger (lp,
-                    h);
-      }
-    }
-  }
   GNUNET_assert (0 ==
                  pthread_mutex_unlock (&h->big_lock));
   if ( (NULL != old) &&
@@ -914,6 +886,54 @@ post_transaction (struct TALER_FAKEBANK_Handle *h,
 }
 
 
+/**
+ * Trigger long pollers that might have been waiting
+ * for @a t.
+ *
+ * @param h fakebank handle
+ * @param t transaction to notify on
+ */
+static void
+notify_transaction (struct TALER_FAKEBANK_Handle *h,
+                    struct Transaction *t)
+{
+  struct Account *debit_acc = t->debit_account;
+  struct Account *credit_acc = t->credit_account;
+  struct LongPoller *nxt;
+
+  GNUNET_assert (0 ==
+                 pthread_mutex_lock (&h->big_lock));
+  for (struct LongPoller *lp = debit_acc->lp_head;
+       NULL != lp;
+       lp = nxt)
+  {
+    nxt = lp->next;
+    if (LP_DEBIT == lp->type)
+    {
+      GNUNET_assert (lp ==
+                     GNUNET_CONTAINER_heap_remove_node (lp->hn));
+      lp_trigger (lp,
+                  h);
+    }
+  }
+  for (struct LongPoller *lp = credit_acc->lp_head;
+       NULL != lp;
+       lp = nxt)
+  {
+    nxt = lp->next;
+    if (LP_CREDIT == lp->type)
+    {
+      GNUNET_assert (lp ==
+                     GNUNET_CONTAINER_heap_remove_node (lp->hn));
+      lp_trigger (lp,
+                  h);
+    }
+  }
+  GNUNET_assert (0 ==
+                 pthread_mutex_unlock (&h->big_lock));
+}
+
+
 /**
  * Tell the fakebank to create another wire transfer *from* an exchange.
  *
@@ -1030,6 +1050,8 @@ make_transfer (
               TALER_B2S (subject),
               exchange_base_url);
   *ret_row_id = t->row_id;
+  notify_transaction (h,
+                      t);
   return GNUNET_OK;
 }
 
@@ -1124,11 +1146,13 @@ make_admin_transfer (
               TALER_amount2s (amount),
               TALER_B2S (reserve_pub),
               (unsigned long long) t->row_id);
+  notify_transaction (h,
+                      t);
   return GNUNET_OK;
 }
 
 
-int
+enum GNUNET_GenericReturnValue
 TALER_FAKEBANK_check_empty (struct TALER_FAKEBANK_Handle *h)
 {
   for (uint64_t i = 0; i<h->ram_limit; i++)
@@ -1852,6 +1876,7 @@ handle_debit_history (struct TALER_FAKEBANK_Handle *h,
                                         connection,
                                         &ha)))
   {
+    GNUNET_break_op (0);
     return (GNUNET_SYSERR == ret) ? MHD_NO : MHD_YES;
   }
   if (&special_ptr == *con_cls)
@@ -2056,13 +2081,15 @@ handle_credit_history (struct TALER_FAKEBANK_Handle *h,
   enum GNUNET_GenericReturnValue ret;
 
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-              "Handling /history/incoming connection %p\n",
-              connection);
+              "Handling /history/incoming connection %p (%d)\n",
+              connection,
+              (*con_cls == &special_ptr));
   if (GNUNET_OK !=
       (ret = parse_history_common_args (h,
                                         connection,
                                         &ha)))
   {
+    GNUNET_break_op (0);
     return (GNUNET_SYSERR == ret) ? MHD_NO : MHD_YES;
   }
   if (&special_ptr == *con_cls)
@@ -2107,6 +2134,8 @@ handle_credit_history (struct TALER_FAKEBANK_Handle *h,
     if ( (NULL == t) ||
          overflow)
     {
+      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                  "No transactions available, suspending request\n");
       GNUNET_free (credit_payto);
       if (GNUNET_TIME_relative_is_zero (ha.lp_timeout) &&
           (0 < ha.delta))
@@ -2478,7 +2507,12 @@ run_mhd (void *cls)
   struct TALER_FAKEBANK_Handle *h = cls;
 
   h->mhd_task = NULL;
-  MHD_run (h->mhd_bank);
+  h->mhd_again = true;
+  while (h->mhd_again)
+  {
+    h->mhd_again = false;
+    MHD_run (h->mhd_bank);
+  }
   schedule_httpd (h);
 }
 
diff --git a/src/include/taler_fakebank_lib.h b/src/include/taler_fakebank_lib.h
index dc6ba1da..16135a4d 100644
--- a/src/include/taler_fakebank_lib.h
+++ b/src/include/taler_fakebank_lib.h
@@ -87,7 +87,7 @@ TALER_FAKEBANK_start2 (uint16_t port,
  * @param h bank instance
  * @return #GNUNET_OK on success
  */
-int
+enum GNUNET_GenericReturnValue
 TALER_FAKEBANK_check_empty (struct TALER_FAKEBANK_Handle *h);
 
 
@@ -109,7 +109,7 @@ TALER_FAKEBANK_check_empty (struct TALER_FAKEBANK_Handle 
*h);
  * @param[out] wtid set to the wire transfer identifier
  * @return #GNUNET_OK on success
  */
-int
+enum GNUNET_GenericReturnValue
 TALER_FAKEBANK_check_debit (struct TALER_FAKEBANK_Handle *h,
                             const struct TALER_Amount *want_amount,
                             const char *want_debit,
@@ -133,7 +133,7 @@ TALER_FAKEBANK_check_debit (struct TALER_FAKEBANK_Handle *h,
  * @param reserve_pub reserve public key expected in wire subject
  * @return #GNUNET_OK on success
  */
-int
+enum GNUNET_GenericReturnValue
 TALER_FAKEBANK_check_credit (struct TALER_FAKEBANK_Handle *h,
                              const struct TALER_Amount *want_amount,
                              const char *want_debit,

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