add sync and timeout functionality to helpers

src/util/crypto_helper_denom.c

@@ -57,6 +57,11 @@ struct TALER_CRYPTO_DenominationHelper
    * The UNIX domain socket, -1 if we are currently not connected.
    */
   int sock;
+
+  /**
+   * Have we ever been sync'ed?
+   */
+  bool synced;
 };
 
 
@@ -348,6 +353,41 @@ handle_mt_purge (struct TALER_CRYPTO_DenominationHelper *dh,
 }
 
 
+/**
+ * Wait until the socket is ready to read.
+ *
+ * @param dh helper to wait for
+ * @return false on timeout (after 5s)
+ */
+static bool
+await_read_ready (struct TALER_CRYPTO_DenominationHelper *dh)
+{
+  /* wait for reply with 5s timeout */
+  struct pollfd pfd = {
+    .fd = dh->sock,
+    .events = POLLIN
+  };
+  sigset_t sigmask;
+  struct timespec ts = {
+    .tv_sec = 5
+  };
+  int ret;
+
+  GNUNET_assert (0 == sigemptyset (&sigmask));
+  GNUNET_assert (0 == sigaddset (&sigmask, SIGTERM));
+  GNUNET_assert (0 == sigaddset (&sigmask, SIGHUP));
+  ret = ppoll (&pfd,
+               1,
+               &ts,
+               &sigmask);
+  if ( (-1 == ret) &&
+       (EINTR != errno) )
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
+                         "ppoll");
+  return (0 < ret);
+}
+
+
 void
 TALER_CRYPTO_helper_denom_poll (struct TALER_CRYPTO_DenominationHelper *dh)
 {
@@ -368,7 +408,13 @@ TALER_CRYPTO_helper_denom_poll (struct TALER_CRYPTO_DenominationHelper *dh)
     if (ret < 0)
     {
       if (EAGAIN == errno)
+      {
+        if (dh->synced)
           break;
+        if (! await_read_ready (dh))
+          break; /* timeout */
+        continue; /* try again */
+      }
       GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
                            "recv");
       do_disconnect (dh);
@@ -404,6 +450,11 @@ TALER_CRYPTO_helper_denom_poll (struct TALER_CRYPTO_DenominationHelper *dh)
         return;
       }
       break;
+    case TALER_HELPER_RSA_SYNCED:
+      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                  "Now synchronized with RSA helper\n");
+      dh->synced = true;
+      break;
     default:
       GNUNET_break_op (0);
       do_disconnect (dh);
@@ -466,35 +517,12 @@ TALER_CRYPTO_helper_denom_sign (
     const struct GNUNET_MessageHeader *hdr
       = (const struct GNUNET_MessageHeader *) buf;
 
-    {
+    if (! await_read_ready (dh))
-      /* wait for reply with 5s timeout */
-      struct pollfd pfd = {
-        .fd = dh->sock,
-        .events = POLLIN
-      };
-      sigset_t sigmask;
-      struct timespec ts = {
-        .tv_sec = 5
-      };
-
-      GNUNET_assert (0 == sigemptyset (&sigmask));
-      GNUNET_assert (0 == sigaddset (&sigmask, SIGTERM));
-      GNUNET_assert (0 == sigaddset (&sigmask, SIGHUP));
-      ret = ppoll (&pfd,
-                   1,
-                   &ts,
-                   &sigmask);
-      if ( (-1 == ret) &&
-           (EINTR != errno) )
-        GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
-                             "ppoll");
-      if (0 >= ret)
     {
       do_disconnect (dh);
       *ec = TALER_EC_GENERIC_TIMEOUT;
       return ds;
     }
-    }
     ret = recv (dh->sock,
                 buf,
                 sizeof (buf),

src/util/crypto_helper_esign.c

@@ -57,6 +57,11 @@ struct TALER_CRYPTO_ExchangeSignHelper
    * The UNIX domain socket, -1 if we are currently not connected.
    */
   int sock;
+
+  /**
+   * Have we reached the sync'ed state?
+   */
+  bool synced;
 };
 
 
@@ -309,6 +314,41 @@ handle_mt_purge (struct TALER_CRYPTO_ExchangeSignHelper *esh,
 }
 
 
+/**
+ * Wait until the socket is ready to read.
+ *
+ * @param dh helper to wait for
+ * @return false on timeout (after 5s)
+ */
+static bool
+await_read_ready (struct TALER_CRYPTO_ExchangeSignHelper *esh)
+{
+  /* wait for reply with 5s timeout */
+  struct pollfd pfd = {
+    .fd = esh->sock,
+    .events = POLLIN
+  };
+  sigset_t sigmask;
+  struct timespec ts = {
+    .tv_sec = 5
+  };
+  int ret;
+
+  GNUNET_assert (0 == sigemptyset (&sigmask));
+  GNUNET_assert (0 == sigaddset (&sigmask, SIGTERM));
+  GNUNET_assert (0 == sigaddset (&sigmask, SIGHUP));
+  ret = ppoll (&pfd,
+               1,
+               &ts,
+               &sigmask);
+  if ( (-1 == ret) &&
+       (EINTR != errno) )
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
+                         "ppoll");
+  return (0 < ret);
+}
+
+
 void
 TALER_CRYPTO_helper_esign_poll (struct TALER_CRYPTO_ExchangeSignHelper *esh)
 {
@@ -329,7 +369,13 @@ TALER_CRYPTO_helper_esign_poll (struct TALER_CRYPTO_ExchangeSignHelper *esh)
     if (ret < 0)
     {
       if (EAGAIN == errno)
+      {
+        if (esh->synced)
           break;
+        if (! await_read_ready (esh))
+          break; /* timeout */
+        continue; /* try again */
+      }
       GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
                            "recv");
       do_disconnect (esh);
@@ -365,6 +411,11 @@ TALER_CRYPTO_helper_esign_poll (struct TALER_CRYPTO_ExchangeSignHelper *esh)
         return;
       }
       break;
+    case TALER_HELPER_EDDSA_SYNCED:
+      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                  "Now synchronized with EdDSA helper\n");
+      esh->synced = true;
+      break;
     default:
       GNUNET_break_op (0);
       do_disconnect (esh);
@@ -422,34 +473,11 @@ TALER_CRYPTO_helper_esign_sign_ (
     const struct GNUNET_MessageHeader *hdr
       = (const struct GNUNET_MessageHeader *) buf;
 
-    {
+    if (! await_read_ready (esh))
-      /* wait for reply with 5s timeout */
-      struct pollfd pfd = {
-        .fd = esh->sock,
-        .events = POLLIN
-      };
-      sigset_t sigmask;
-      struct timespec ts = {
-        .tv_sec = 5
-      };
-
-      GNUNET_assert (0 == sigemptyset (&sigmask));
-      GNUNET_assert (0 == sigaddset (&sigmask, SIGTERM));
-      GNUNET_assert (0 == sigaddset (&sigmask, SIGHUP));
-      ret = ppoll (&pfd,
-                   1,
-                   &ts,
-                   &sigmask);
-      if ( (-1 == ret) &&
-           (EINTR != errno) )
-        GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
-                             "ppoll");
-      if (0 >= ret)
     {
       do_disconnect (esh);
       return TALER_EC_GENERIC_TIMEOUT;
     }
-    }
     ret = recv (esh->sock,
                 buf,
                 sizeof (buf),

src/util/taler-helper-crypto-eddsa.c

@@ -879,9 +879,28 @@ read_job (void *cls)
                                    key))
         {
           /* client died, skip the rest */
+          client = NULL;
           break;
         }
       }
+      if (NULL != client)
+      {
+        struct GNUNET_MessageHeader synced = {
+          .type = htons (TALER_HELPER_EDDSA_SYNCED),
+          .size = htons (sizeof (synced))
+        };
+
+        if (GNUNET_OK !=
+            transmit (&client->addr,
+                      client->addr_size,
+                      &synced))
+        {
+          GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                      "Client %s must have disconnected\n",
+                      client->addr.sun_path);
+          free_client (client);
+        }
+      }
     }
     break;
   case TALER_HELPER_EDDSA_MT_REQ_SIGN:
@@ -1532,9 +1551,11 @@ run (void *cls,
                                              unix_sock,
                                              &read_job,
                                              NULL);
-
+  /* start job to keep keys up-to-date; MUST be run before the #read_task,
-  /* start job to keep keys up-to-date */
+     hence with priority. */
-  keygen_task = GNUNET_SCHEDULER_add_now (&update_keys,
+  keygen_task = GNUNET_SCHEDULER_add_with_priority (
+    GNUNET_SCHEDULER_PRIORITY_URGENT,
+    &update_keys,
     NULL);
 
   /* start job to handle completed work */

src/util/taler-helper-crypto-eddsa.h

@@ -31,6 +31,9 @@
 #define TALER_HELPER_EDDSA_MT_RES_SIGNATURE 17
 #define TALER_HELPER_EDDSA_MT_RES_SIGN_FAILURE 18
 
+#define TALER_HELPER_EDDSA_SYNCED 19
+
+
 GNUNET_NETWORK_STRUCT_BEGIN
 
 /**

src/util/taler-helper-crypto-rsa.c

@@ -1061,6 +1061,24 @@ read_job (void *cls)
         if (NULL == client)
           break;
       }
+      if (NULL != client)
+      {
+        struct GNUNET_MessageHeader synced = {
+          .type = htons (TALER_HELPER_RSA_SYNCED),
+          .size = htons (sizeof (synced))
+        };
+
+        if (GNUNET_OK !=
+            transmit (&client->addr,
+                      client->addr_size,
+                      &synced))
+        {
+          GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                      "Client %s must have disconnected\n",
+                      client->addr.sun_path);
+          free_client (client);
+        }
+      }
     }
     break;
   case TALER_HELPER_RSA_MT_REQ_SIGN:
@@ -1914,9 +1932,11 @@ run (void *cls,
                                              unix_sock,
                                              &read_job,
                                              NULL);
-
+  /* start job to keep keys up-to-date; MUST be run before the #read_task,
-  /* start job to keep keys up-to-date */
+     hence with priority. */
-  keygen_task = GNUNET_SCHEDULER_add_now (&update_denominations,
+  keygen_task = GNUNET_SCHEDULER_add_with_priority (
+    GNUNET_SCHEDULER_PRIORITY_URGENT,
+    &update_denominations,
     NULL);
 
   /* start job to handle completed work */

src/util/taler-helper-crypto-rsa.h

@@ -31,6 +31,8 @@
 #define TALER_HELPER_RSA_MT_RES_SIGNATURE 7
 #define TALER_HELPER_RSA_MT_RES_SIGN_FAILURE 8
 
+#define TALER_HELPER_RSA_SYNCED 9
+
 GNUNET_NETWORK_STRUCT_BEGIN
 
 /**