[taler-exchange] 85/152: move rewind command to exchange, add proper support for rewinding in batches, modify API to rewind to label

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grothoff pushed a commit to branch master
in repository exchange.

commit 025c2f566709abb1f8971b7458f68223492c81e3
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Fri Jul 3 20:57:01 2020 +0200

    move rewind command to exchange, add proper support for rewinding in 
batches, modify API to rewind to label
---
 src/include/taler_testing_lib.h      |  38 +++++-
 src/testing/Makefile.am              |   1 +
 src/testing/testing_api_cmd_batch.c  |  22 ++++
 src/testing/testing_api_cmd_rewind.c | 222 +++++++++++++++++++++++++++++++++++
 src/testing/testing_api_cmd_stat.c   |   1 -
 src/testing/testing_api_loop.c       |  11 +-
 6 files changed, 283 insertions(+), 12 deletions(-)

diff --git a/src/include/taler_testing_lib.h b/src/include/taler_testing_lib.h
index ae0bcce7..f81acb99 100644
--- a/src/include/taler_testing_lib.h
+++ b/src/include/taler_testing_lib.h
@@ -374,10 +374,9 @@ struct TALER_TESTING_Interpreter
   void *final_cleanup_cb_cls;
 
   /**
-   * Instruction pointer.  Tells #interpreter_run() which
-   * instruction to run next.  Need (signed) int because
-   * it gets -1 when rewinding the interpreter to the first
-   * CMD.
+   * Instruction pointer.  Tells #interpreter_run() which instruction to run
+   * next.  Need (signed) int because it gets -1 when rewinding the
+   * interpreter to the first CMD.
    */
   int ip;
 
@@ -585,7 +584,22 @@ TALER_TESTING_interpreter_fail (struct 
TALER_TESTING_Interpreter *is);
  * @return a end-command.
  */
 struct TALER_TESTING_Command
-TALER_TESTING_cmd_end ();
+TALER_TESTING_cmd_end (void);
+
+
+/**
+ * Make the instruction pointer point to @a target_label
+ * only if @a counter is greater than zero.
+ *
+ * @param label command label
+ * @param target_label label of the new instruction pointer's destination 
after the jump;
+ *                     must be before the current instruction
+ * @param counter counts how many times the rewinding is to happen.
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_rewind_ip (const char *label,
+                             const char *target_label,
+                             unsigned int counter);
 
 
 /**
@@ -802,7 +816,6 @@ TALER_TESTING_setup_with_auditor_and_exchange 
(TALER_TESTING_Main main_cb,
  * @param config_filename configuration filename.
  * @param bank_url base URL of the bank, used by `wget' to check
  *        that the bank was started right.
- *
  * @return the process, or NULL if the process could not
  *         be started.
  */
@@ -825,6 +838,7 @@ TALER_TESTING_run_bank (const char *config_filename,
 struct GNUNET_OS_Process *
 TALER_TESTING_run_nexus (const struct TALER_TESTING_BankConfiguration *bc);
 
+
 /**
  * Runs the Fakebank by guessing / extracting the portnumber
  * from the base URL.
@@ -1882,6 +1896,18 @@ TALER_TESTING_cmd_batch_next (struct 
TALER_TESTING_Interpreter *is);
 struct TALER_TESTING_Command *
 TALER_TESTING_cmd_batch_get_current (const struct TALER_TESTING_Command *cmd);
 
+
+/**
+ * Set what command the batch should be at.
+ *
+ * @param cmd current batch command
+ * @param new_ip where to move the IP
+ */
+void
+TALER_TESTING_cmd_batch_set_current (const struct TALER_TESTING_Command *cmd,
+                                     unsigned int new_ip);
+
+
 /**
  * Make a serialize-keys CMD.
  *
diff --git a/src/testing/Makefile.am b/src/testing/Makefile.am
index d73e89b3..014faa46 100644
--- a/src/testing/Makefile.am
+++ b/src/testing/Makefile.am
@@ -61,6 +61,7 @@ libtalertesting_la_SOURCES = \
   testing_api_cmd_refund.c \
   testing_api_cmd_refresh.c \
   testing_api_cmd_revoke.c \
+  testing_api_cmd_rewind.c \
   testing_api_cmd_serialize_keys.c \
   testing_api_cmd_signal.c \
   testing_api_cmd_sleep.c \
diff --git a/src/testing/testing_api_cmd_batch.c 
b/src/testing/testing_api_cmd_batch.c
index 48ccf55f..d81a5c38 100644
--- a/src/testing/testing_api_cmd_batch.c
+++ b/src/testing/testing_api_cmd_batch.c
@@ -228,5 +228,27 @@ TALER_TESTING_cmd_batch_get_current (const struct 
TALER_TESTING_Command *cmd)
 {
   struct BatchState *bs = cmd->cls;
 
+  GNUNET_assert (cmd->run == &batch_run);
   return &bs->batch[bs->batch_ip];
 }
+
+
+/**
+ * Set what command the batch should be at.
+ *
+ * @param cmd current batch command
+ * @param new_ip where to move the IP
+ */
+void
+TALER_TESTING_cmd_batch_set_current (const struct TALER_TESTING_Command *cmd,
+                                     unsigned int new_ip)
+{
+  struct BatchState *bs = cmd->cls;
+
+  /* sanity checks */
+  GNUNET_assert (cmd->run == &batch_run);
+  for (unsigned int i = 0; i < new_ip; i++)
+    GNUNET_assert (NULL != bs->batch[i].label);
+  /* actual logic */
+  bs->batch_ip = new_ip;
+}
diff --git a/src/testing/testing_api_cmd_rewind.c 
b/src/testing/testing_api_cmd_rewind.c
new file mode 100644
index 00000000..cde966d7
--- /dev/null
+++ b/src/testing/testing_api_cmd_rewind.c
@@ -0,0 +1,222 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014-2020 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 3, or
+  (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public
+  License along with TALER; see the file COPYING.  If not, see
+  <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file testing/testing_api_cmd_rewind.c
+ * @brief command to rewind the instruction pointer.
+ * @author Marcello Stanisci
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <taler/taler_exchange_service.h>
+#include <taler/taler_testing_lib.h>
+#include "taler_testing_lib.h"
+
+
+/**
+ * State for a "rewind" CMD.
+ */
+struct RewindIpState
+{
+  /**
+   * Instruction pointer to set into the interpreter.
+   */
+  const char *target_label;
+
+  /**
+   * How many times this set should take place.  However, this value lives at
+   * the calling process, and this CMD is only in charge of checking and
+   * decremeting it.
+   */
+  unsigned int counter;
+};
+
+
+/**
+ * Only defined to respect the API.
+ */
+static void
+rewind_ip_cleanup (void *cls,
+                   const struct TALER_TESTING_Command *cmd)
+{
+  (void) cls;
+  (void) cmd;
+}
+
+
+/**
+ * Seek for the @a target command in @a batch (and rewind to it
+ * if successful).
+ *
+ * @param is the interpreter state (for failures)
+ * @param cmd batch to search for @a target
+ * @param target command to search for
+ * @return #GNUNET_OK on success, #GNUNET_NO if target was not found,
+ *         #GNUNET_SYSERR if target is in the future and we failed
+ */
+static int
+seek_batch (struct TALER_TESTING_Interpreter *is,
+            const struct TALER_TESTING_Command *cmd,
+            const struct TALER_TESTING_Command *target)
+{
+  unsigned int new_ip;
+#define BATCH_INDEX 1
+  struct TALER_TESTING_Command *batch;
+  struct TALER_TESTING_Command *current;
+  struct TALER_TESTING_Command *icmd;
+  const struct TALER_TESTING_Command *match;
+
+  current = TALER_TESTING_cmd_batch_get_current (cmd);
+  GNUNET_assert (GNUNET_OK ==
+                 TALER_TESTING_get_trait_cmd (cmd,
+                                              BATCH_INDEX,
+                                              &batch));
+  match = NULL;
+  for (new_ip = 0;
+       NULL != (icmd = &batch[new_ip]);
+       new_ip++)
+  {
+    if (current == target)
+      current = NULL;
+    if (icmd == target)
+    {
+      match = icmd;
+      break;
+    }
+    if (TALER_TESTING_cmd_is_batch (icmd))
+    {
+      int ret = seek_batch (is,
+                            icmd,
+                            target);
+      if (GNUNET_SYSERR == ret)
+        return GNUNET_SYSERR; /* failure! */
+      if (GNUNET_OK == ret)
+      {
+        match = icmd;
+        break;
+      }
+    }
+  }
+  if (NULL == current)
+  {
+    /* refuse to jump forward */
+    GNUNET_break (0);
+    TALER_TESTING_interpreter_fail (is);
+    return GNUNET_SYSERR;
+  }
+  if (NULL == match)
+    return GNUNET_NO; /* not found */
+  TALER_TESTING_cmd_batch_set_current (cmd,
+                                       new_ip);
+  return GNUNET_OK;
+}
+
+
+/**
+ * Run the "rewind" CMD.
+ *
+ * @param cls closure.
+ * @param cmd command being executed now.
+ * @param is the interpreter state.
+ */
+static void
+rewind_ip_run (void *cls,
+               const struct TALER_TESTING_Command *cmd,
+               struct TALER_TESTING_Interpreter *is)
+{
+  struct RewindIpState *ris = cls;
+  const struct TALER_TESTING_Command *target;
+  unsigned int new_ip;
+
+  (void) cmd;
+  if (0 == ris->counter)
+  {
+    TALER_TESTING_interpreter_next (is);
+    return;
+  }
+  target
+    = TALER_TESTING_interpreter_lookup_command (is,
+                                                ris->target_label);
+  if (NULL == target)
+  {
+    GNUNET_break (0);
+    TALER_TESTING_interpreter_fail (is);
+    return;
+  }
+  ris->counter--;
+  for (new_ip = 0;
+       NULL != is->commands[new_ip].label;
+       new_ip++)
+  {
+    const struct TALER_TESTING_Command *cmd = &is->commands[new_ip];
+
+    if (cmd == target)
+      break;
+    if (TALER_TESTING_cmd_is_batch (cmd))
+    {
+      int ret = seek_batch (is,
+                            cmd,
+                            target);
+      if (GNUNET_SYSERR == ret)
+        return;   /* failure! */
+      if (GNUNET_OK == ret)
+        break;
+    }
+  }
+  if (new_ip > is->ip)
+  {
+    /* refuse to jump forward */
+    GNUNET_break (0);
+    TALER_TESTING_interpreter_fail (is);
+    return;
+  }
+  is->ip = new_ip - 1; /* -1 because the next function will advance by one */
+  TALER_TESTING_interpreter_next (is);
+}
+
+
+/**
+ * Make the instruction pointer point to @a new_ip
+ * only if @a counter is greater than zero.
+ *
+ * @param label command label
+ * @param target_label label of the new instruction pointer's destination 
after the jump;
+ *                     must be before the current instruction
+ * @param counter counts how many times the rewinding is to happen.
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_rewind_ip (const char *label,
+                             const char *target_label,
+                             unsigned int counter)
+{
+  struct RewindIpState *ris;
+
+  ris = GNUNET_new (struct RewindIpState);
+  ris->target_label = target_label;
+  ris->counter = counter;
+  {
+    struct TALER_TESTING_Command cmd = {
+      .cls = ris,
+      .label = label,
+      .run = &rewind_ip_run,
+      .cleanup = &rewind_ip_cleanup
+    };
+
+    return cmd;
+  }
+}
diff --git a/src/testing/testing_api_cmd_stat.c 
b/src/testing/testing_api_cmd_stat.c
index cf6d0b48..9461a22c 100644
--- a/src/testing/testing_api_cmd_stat.c
+++ b/src/testing/testing_api_cmd_stat.c
@@ -40,7 +40,6 @@ stat_cleanup (void *cls,
   (void) cls;
   (void) cmd;
   /* nothing to clean.  */
-  return;
 }
 
 
diff --git a/src/testing/testing_api_loop.c b/src/testing/testing_api_loop.c
index 9b494da0..af4a63c6 100644
--- a/src/testing/testing_api_loop.c
+++ b/src/testing/testing_api_loop.c
@@ -69,6 +69,7 @@ TALER_TESTING_interpreter_lookup_command (struct 
TALER_TESTING_Interpreter *is,
 #define BATCH_INDEX 1
       struct TALER_TESTING_Command *batch;
       struct TALER_TESTING_Command *current;
+      struct TALER_TESTING_Command *icmd;
       const struct TALER_TESTING_Command *match;
 
       current = TALER_TESTING_cmd_batch_get_current (cmd);
@@ -79,15 +80,15 @@ TALER_TESTING_interpreter_lookup_command (struct 
TALER_TESTING_Interpreter *is,
       /* We must do the loop forward, but we can find the last match */
       match = NULL;
       for (unsigned int j = 0;
-           NULL != (cmd = &batch[j])->label;
+           NULL != (icmd = &batch[j])->label;
            j++)
       {
-        if (current == cmd)
+        if (current == icmd)
           break; /* do not go past current command */
-        if ( (NULL != cmd->label) &&
-             (0 == strcmp (cmd->label,
+        if ( (NULL != icmd->label) &&
+             (0 == strcmp (icmd->label,
                            label)) )
-          match = cmd;
+          match = icmd;
       }
       if (NULL != match)
         return match;

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