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/*
This file is part of GNUnet
Copyright (C) 2021 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file testing/testing_api_cmd_finish.c
* @brief command to wait for completion of async command
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_testing_ng_lib.h"
/**
* Struct to use for command-specific context information closure of a command waiting
* for another command.
*/
struct FinishState
{
/**
* Closure for all commands with command-specific context information.
*/
void *cls;
/**
* Label of the asynchronous command the synchronous command of this closure waits for.
*/
const char *async_label;
/**
* Task for running the finish method of the asynchronous task the command is waiting for.
*/
struct GNUNET_SCHEDULER_Task *finish_task;
/**
* Interpreter we are part of.
*/
struct GNUNET_TESTING_Interpreter *is;
/**
* Function to call when done.
*/
GNUNET_SCHEDULER_TaskCallback cont;
/**
* Closure for @e cont.
*/
void *cont_cls;
/**
* How long to wait until finish fails hard?
*/
struct GNUNET_TIME_Relative timeout;
/**
* Set to #GNUNET_OK if the @a async_label command finished on time
*/
enum GNUNET_GenericReturnValue finished;
};
/**
*/
static void
done_finish (void *cls)
{
struct FinishState *finish_state = cls;
GNUNET_SCHEDULER_cancel (finish_state->finish_task);
finish_state->finish_task = NULL;
finish_state->finished = GNUNET_YES;
if (NULL != finish_state->cont)
{
finish_state->cont (finish_state->cont_cls);
}
}
/**
*/
static void
timeout_finish (void *cls)
{
struct FinishState *finish_state = cls;
finish_state->finish_task = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Timeout waiting for command `%s' to finish\n",
finish_state->async_label);
finish_state->finished = GNUNET_SYSERR;
GNUNET_TESTING_interpreter_fail (finish_state->is);
}
/**
* Run method of the command created by the interpreter to wait for another
* command to finish.
*
*/
static void
run_finish_on_ref (void *cls,
struct GNUNET_TESTING_Interpreter *is)
{
struct FinishState *finish_state = cls;
const struct GNUNET_TESTING_Command *async_cmd;
finish_state->is = is;
async_cmd
= GNUNET_TESTING_interpreter_lookup_command (is,
finish_state->async_label);
if (NULL == async_cmd)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Did not find command `%s'\n",
finish_state->async_label);
GNUNET_TESTING_interpreter_fail (is);
return;
}
if ( (NULL == async_cmd->finish) ||
(! async_cmd->asynchronous_finish) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Cannot finish `%s': not asynchronous\n",
finish_state->async_label);
GNUNET_TESTING_interpreter_fail (is);
return;
}
finish_state->finish_task
= GNUNET_SCHEDULER_add_delayed (finish_state->timeout,
&timeout_finish,
finish_state);
async_cmd->finish (async_cmd->cls,
&done_finish,
finish_state);
}
/**
* Wait for any asynchronous execution of @e run to conclude,
* then call finish_cont. Finish may only be called once per command.
*
* This member may be NULL if this command is a synchronous command,
* and also should be set to NULL once the command has finished.
*
* @param cls closure
* @param cont function to call upon completion, can be NULL
* @param cont_cls closure for @a cont
* @return
* #GNUNET_NO if the command is still running and @a cont will be called later
* #GNUNET_OK if the command completed successfully and @a cont was called
* #GNUNET_SYSERR if the operation @a cont was NOT called
*/
static enum GNUNET_GenericReturnValue
finish_finish_on_ref (void *cls,
GNUNET_SCHEDULER_TaskCallback cont,
void *cont_cls)
{
struct FinishState *finish_state = cls;
switch (finish_state->finished)
{
case GNUNET_OK:
cont (cont_cls);
break;
case GNUNET_SYSERR:
GNUNET_break (0);
break;
case GNUNET_NO:
if (NULL != finish_state->cont)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
finish_state->cont = cont;
finish_state->cont_cls = cont_cls;
break;
}
return finish_state->finished;
}
/**
* Create (synchronous) command that waits for another command to finish.
* If @a cmd_ref did not finish after @a timeout, this command will fail
* the test case.
*
* @param finish_label label for this command
* @param cmd_ref reference to a previous command which we should
* wait for (call `finish()` on)
* @param timeout how long to wait at most for @a cmd_ref to finish
* @return a finish-command.
*/
const struct GNUNET_TESTING_Command
GNUNET_TESTING_cmd_finish (const char *finish_label,
const char *cmd_ref,
struct GNUNET_TIME_Relative timeout)
{
struct FinishState *finish_state;
finish_state = GNUNET_new (struct FinishState);
finish_state->async_label = cmd_ref;
finish_state->timeout = timeout;
{
struct GNUNET_TESTING_Command cmd = {
.cls = finish_state,
.label = finish_label,
.run = &run_finish_on_ref,
.finish = &finish_finish_on_ref
};
return cmd;
}
}
struct GNUNET_TESTING_Command
GNUNET_TESTING_cmd_make_unblocking (struct GNUNET_TESTING_Command cmd)
{
/* do not permit this function to be used on
a finish command! */
GNUNET_assert (cmd.run != &run_finish_on_ref);
cmd.asynchronous_finish = true;
return cmd;
}
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