#bash #aws #retry awscli retry backoff for bash

aws_retry.sh

#!/usr/bin/env bash

set -e

aws_retry() {
	last_aws_call=""
	local max_attempts=${ATTEMPTS-8}
	local timeout=${TIMEOUT-2}
	local attempt=0
	local exitCode=0

	while [[ $attempt < $max_attempts ]]
	do
		echo "Attempt - $attempt" 1>&2
		set +e
		last_aws_call=$(${@})
		exitCode=$?
		set -e

		if [[ ! $last_aws_call =~ .*RequestLimitExceeded.* ]] && [[ $exitCode == 0 ]]; then
			echo "awscli command ok" 1>&2
			echo "exitCode zero on: $@" 1>&2
			break
		fi


		echo "Failure! Retrying in $timeout.." 1>&2
		echo "Retry command: $@" 1>&2
		sleep $timeout
		attempt=$(( attempt + 1 ))
		timeout=$(( timeout * 2 ))
	done

	if [[ $exitCode != 0 ]]; then
		echo "You've failed me for the last time! ($@)" 1>&2
		exit $exitCode
	fi
}

main() {
  aws_retry aws ec2 describe-instances ...
  
  echo $last_aws_call
}

main