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Restructure platform directory (#382)
This updates the platform and logging directory and moves it to the following places: FreeRTOS\FreeRTOS-Plus\Source\Utilities FreeRTOS\FreeRTOS-Plus\Source\Application-Protocols\network_transport\freertos_plus_tcp Project files are updated to follow suite. All updated demos are tested to work as expected.
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Oscar Michael Abrina
GitHub
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47 changed files with 224 additions and 218 deletions
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/*
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* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* @file retry_utils.h
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* @brief Declaration of the exponential backoff retry logic utility functions
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* and constants.
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*/
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#ifndef RETRY_UTILS_H_
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#define RETRY_UTILS_H_
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/* Standard include. */
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#include <stdint.h>
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/**
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* @page retryutils_page Retry Utilities
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* @brief An abstraction of utilities for retrying with exponential back off and
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* jitter.
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*
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* @section retryutils_overview Overview
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* The retry utilities are a set of APIs that aid in retrying with exponential
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* backoff and jitter. Exponential backoff with jitter is strongly recommended
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* for retrying failed actions over the network with servers. Please see
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* https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/ for
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* more information about the benefits with AWS.
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*
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* Exponential backoff with jitter is typically used when retrying a failed
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* connection to the server. In an environment with poor connectivity, a client
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* can get disconnected at any time. A backoff strategy helps the client to
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* conserve battery by not repeatedly attempting reconnections when they are
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* unlikely to succeed.
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*
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* Before retrying the failed communication to the server there is a quiet period.
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* In this quiet period, the task that is retrying must sleep for some random
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* amount of seconds between 0 and the lesser of a base value and a predefined
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* maximum. The base is doubled with each retry attempt until the maximum is
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* reached.<br>
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*
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* > sleep_seconds = random_between( 0, min( 2<sup>attempts_count</sup> * base_seconds, maximum_seconds ) )
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*
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* @section retryutils_implementation Implementing Retry Utils
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*
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* The functions that must be implemented are:<br>
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* - @ref RetryUtils_ParamsReset
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* - @ref RetryUtils_BackoffAndSleep
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*
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* The functions are used as shown in the diagram below. This is the exponential
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* backoff with jitter loop:
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*
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* @image html retry_utils_flow.png width=25%
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*
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* The following steps give guidance on implementing the Retry Utils. An example
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* implementation of the Retry Utils for a POSIX platform can be found in file
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* @ref retry_utils_posix.c.
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*
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* -# Implementing @ref RetryUtils_ParamsReset
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* @snippet this define_retryutils_paramsreset
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*<br>
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* This function initializes @ref RetryUtilsParams_t. It is expected to set
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* @ref RetryUtilsParams_t.attemptsDone to zero. It is also expected to set
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* @ref RetryUtilsParams_t.nextJitterMax to @ref INITIAL_RETRY_BACKOFF_SECONDS
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* plus some random amount of seconds, jitter. This jitter is a random number
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* between 0 and @ref MAX_JITTER_VALUE_SECONDS. This function must be called
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* before entering the exponential backoff with jitter loop using
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* @ref RetryUtils_BackoffAndSleep.<br><br>
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* Please follow the example below to implement your own @ref RetryUtils_ParamsReset.
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* The lines with FIXME comments should be updated.
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* @code{c}
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* void RetryUtils_ParamsReset( RetryUtilsParams_t * pRetryParams )
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* {
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* uint32_t jitter = 0;
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*
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* // Reset attempts done to zero so that the next retry cycle can start.
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* pRetryParams->attemptsDone = 0;
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*
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* // Seed pseudo random number generator with the current time. FIXME: Your
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* // system may have another method to retrieve the current time to seed the
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* // pseudo random number generator.
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* srand( time( NULL ) );
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*
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* // Calculate jitter value using picking a random number.
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* jitter = ( rand() % MAX_JITTER_VALUE_SECONDS );
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*
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* // Reset the backoff value to the initial time out value plus jitter.
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* pRetryParams->nextJitterMax = INITIAL_RETRY_BACKOFF_SECONDS + jitter;
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* }
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* @endcode<br>
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*
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* -# Implementing @ref RetryUtils_BackoffAndSleep
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* @snippet this define_retryutils_backoffandsleep
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* <br>
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* When this function is invoked, the calling task is expected to sleep a random
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* number of seconds between 0 and @ref RetryUtilsParams_t.nextJitterMax. After
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* sleeping this function must double @ref RetryUtilsParams_t.nextJitterMax, but
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* not exceeding @ref MAX_RETRY_BACKOFF_SECONDS. When @ref RetryUtilsParams_t.maxRetryAttempts
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* are reached this function should return @ref RetryUtilsRetriesExhausted, unless
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* @ref RetryUtilsParams_t.maxRetryAttempts is set to zero.
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* When @ref RetryUtilsRetriesExhausted is returned the calling application can
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* stop trying with a failure, or it can call @ref RetryUtils_ParamsReset again
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* and restart the exponential back off with jitter loop.<br><br>
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* Please follow the example below to implement your own @ref RetryUtils_BackoffAndSleep.
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* The lines with FIXME comments should be updated.
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* @code{c}
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* RetryUtilsStatus_t RetryUtils_BackoffAndSleep( RetryUtilsParams_t * pRetryParams )
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* {
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* RetryUtilsStatus_t status = RetryUtilsRetriesExhausted;
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* // The quiet period delay in seconds.
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* int backOffDelay = 0;
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*
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* // If pRetryParams->maxRetryAttempts is set to 0, try forever.
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* if( ( pRetryParams->attemptsDone < pRetryParams->maxRetryAttempts ) ||
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* ( 0U == pRetryParams->maxRetryAttempts ) )
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* {
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* // Choose a random value for back-off time between 0 and the max jitter value.
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* backOffDelay = rand() % pRetryParams->nextJitterMax;
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*
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* // Wait for backoff time to expire for the next retry.
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* ( void ) myThreadSleepFunction( backOffDelay ); // FIXME: Replace with your system's thread sleep function.
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*
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* // Increment backoff counts.
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* pRetryParams->attemptsDone++;
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*
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* // Double the max jitter value for the next retry attempt, only
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* // if the new value will be less than the max backoff time value.
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* if( pRetryParams->nextJitterMax < ( MAX_RETRY_BACKOFF_SECONDS / 2U ) )
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* {
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* pRetryParams->nextJitterMax += pRetryParams->nextJitterMax;
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* }
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* else
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* {
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* pRetryParams->nextJitterMax = MAX_RETRY_BACKOFF_SECONDS;
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* }
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*
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* status = RetryUtilsSuccess;
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* }
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* else
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* {
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* // When max retry attempts are exhausted, let application know by
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* // returning RetryUtilsRetriesExhausted. Application may choose to
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* // restart the retry process after calling RetryUtils_ParamsReset().
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* status = RetryUtilsRetriesExhausted;
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* RetryUtils_ParamsReset( pRetryParams );
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* }
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*
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* return status;
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* }
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* @endcode
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*/
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/**
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* @brief Max number of retry attempts. Set this value to 0 if the client must
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* retry forever.
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*/
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#define MAX_RETRY_ATTEMPTS 4U
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/**
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* @brief Initial fixed backoff value in seconds between two successive
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* retries. A random jitter value is added to every backoff value.
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*/
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#define INITIAL_RETRY_BACKOFF_SECONDS 1U
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/**
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* @brief Max backoff value in seconds.
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*/
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#define MAX_RETRY_BACKOFF_SECONDS 128U
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/**
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* @brief Max jitter value in seconds.
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*/
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#define MAX_JITTER_VALUE_SECONDS 5U
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/**
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* @brief Status for @ref RetryUtils_BackoffAndSleep.
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*/
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typedef enum RetryUtilsStatus
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{
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RetryUtilsSuccess = 0, /**< @brief The function returned successfully after sleeping. */
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RetryUtilsRetriesExhausted /**< @brief The function exhausted all retry attempts. */
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} RetryUtilsStatus_t;
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/**
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* @brief Represents parameters required for retry logic.
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*/
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typedef struct RetryUtilsParams
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{
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/**
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* @brief Max number of retry attempts. Set this value to 0 if the client must
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* retry forever.
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*/
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uint32_t maxRetryAttempts;
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/**
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* @brief The cumulative count of backoff delay cycles completed
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* for retries.
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*/
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uint32_t attemptsDone;
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/**
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* @brief The max jitter value for backoff time in retry attempt.
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*/
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uint32_t nextJitterMax;
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} RetryUtilsParams_t;
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/**
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* @brief Resets the retry timeout value and number of attempts.
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* This function must be called by the application before a new retry attempt.
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*
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* @param[in, out] pRetryParams Structure containing attempts done and timeout
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* value.
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*/
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void RetryUtils_ParamsReset( RetryUtilsParams_t * pRetryParams );
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/**
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* @brief Simple platform specific exponential backoff function. The application
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* must use this function between retry failures to add exponential delay.
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* This function will block the calling task for the current timeout value.
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*
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* @param[in, out] pRetryParams Structure containing retry parameters.
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*
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* @return #RetryUtilsSuccess after a successful sleep, #RetryUtilsRetriesExhausted
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* when all attempts are exhausted.
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*/
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RetryUtilsStatus_t RetryUtils_BackoffAndSleep( RetryUtilsParams_t * pRetryParams );
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#endif /* ifndef RETRY_UTILS_H_ */
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