Last active
December 9, 2020 04:30
Star
You must be signed in to star a gist
Simple script to read new records from an AWS Kinesis stream
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/bash -eu | |
# | |
# Test script to read from a Kinesis Data Stream | |
# | |
# Olivier Mehani <olivier.mehani@learnosity.com> | |
# | |
# Example usage: | |
# | |
# REGION=ap-southeast-2 AWS_PROFILE=playground ./read-stream.sh kinesis-cross-account-playground | |
# | |
# Write data into the stream directly | |
# | |
# aws --profile playground --region ap-southeast-2 kinesis put-records --stream-name kinesis-cross-account-playground --records '{ "PartitionKey": "foo", "Data": "bar" }' | |
# | |
AWS='aws' | |
SED='sed' | |
UNBASE64='base64 --decode' | |
function main() { | |
if [ ${#} -lt 1 ]; then | |
echo "usage: AWS_PROFILE=... REGION=... usage: ${0} STREAM_NAME [MAX_READS=1000]" | |
exit 1 | |
fi | |
REGION=${REGION:-us-east-1} | |
AWS_PROFILE=${AWS_PROFILE:-default} | |
export AWS_PROFILE REGION | |
STREAM_NAME=${1} | |
MAX_READS=${2:-1000} | |
info "Searching for stream; profile=${AWS_PROFILE} region=${REGION} stream_name=${STREAM_NAME}" | |
STREAMS_LIST="$(aws_run_parse 'kinesis list-streams' STREAMNAMES)" | |
if ! (echo "${STREAMS_LIST}" | grep -q "${STREAM_NAME}"); then | |
# shellcheck disable=SC2116 disable=SC2086 | |
die "stream name '${STREAM_NAME}' not found in $(echo ${STREAMS_LIST})" | |
fi | |
SHARD_IDS="$(aws_run_parse "kinesis list-shards --stream-name ${STREAM_NAME}" SHARDS)" | |
info "Getting records from stream; stream_name=${STREAM_NAME} nshards=$(echo "${SHARD_IDS}" | count)" | |
# shellcheck disable=SC2064 | |
trap "kill -TERM -${$}" EXIT | |
for shard_id in ${SHARD_IDS}; do | |
read_shard "${STREAM_NAME}" "${shard_id}" & | |
done | |
wait | |
} | |
function die() { | |
echo "error: ${1}" >&2 | |
exit 1 | |
} | |
function count() { | |
wc -w | ${SED} 's/\s//g' | |
} | |
function read_shard() { | |
stream_name=${1} | |
shard_id=${2} | |
shard_iterator="$(aws_run_parse "kinesis get-shard-iterator --stream-name ${stream_name} \ | |
--shard-id ${shard_id} --shard-iterator-type LATEST" | |
)" | |
info "Reading shard; shard_id=${shard_id} shard_iterator=${shard_iterator}" | |
for i in $(seq "${MAX_READS}"); do | |
RECORDS=$(aws_run_parse "kinesis get-records --shard-iterator ${shard_iterator}") | |
while read -r type ts record event_id offset; do | |
if [ -z "${type}" ]; then | |
continue | |
fi | |
case "${type}" in | |
"0") | |
shard_iterator="${ts}" | |
;; | |
"RECORDS") | |
event=$(echo "${record}" | ${UNBASE64}) | |
echo "$(date) ${shard_id} [${i}/${MAX_READS}] offset=${offset} ts=${ts} eventId=${event_id} eventData=${event}" | |
;; | |
*) | |
warning "Unknown type from Kinesis; record=${type}" | |
;; | |
esac | |
done <<< "${RECORDS}" | |
sleep 1 | |
done | |
} | |
function aws_run_parse() { | |
AWS_COMMAND=${1} | |
KEY=${2:-^} | |
# shellcheck disable=SC2086 | |
${AWS} --output text --profile ${AWS_PROFILE} --region ${REGION} ${AWS_COMMAND} | ${SED} -n "s/${KEY}//p" | |
} | |
function info() { | |
echo "info: ${1}" >&2 | |
} | |
function warning() { | |
echo "warning: ${1}" >&2 | |
} | |
main "${@}" |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment