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b5979: Fix some formatting and bugs. Add randomisation to timeouts.

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This commit is contained in:
Thomas Stokes
2024-03-15 16:57:23 +01:00
parent d347a77580
commit 3c29293d80
1 changed files with 9 additions and 5 deletions
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configuration/environments_scripts/reverse_proxy/files/var/www/cgi-bin/reverseProxyHealthcheck.sh
+9 -5
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@@ -16,6 +16,10 @@ status() {
# parameter 1: status code and messages
echo "Status: $1"
}
randomise() {
# $1: A number to slightly randomise
echo $(($RANDOM % 10 + $1 ))
}
# The names of the variables in the macros file.
ARCHIVE_IP_NAME="ARCHIVE_IP"
ARCHIVE_FAILOVER_IP_NAME="ARCHIVE_FAILOVER_IP"
@@ -55,7 +59,7 @@ if [[ "$?" -ne 0 ]]; then
exit 0
fi
current_time=$(date +"%s")
if [[ ! -e "$ID_TO_AZ_FILENAME" || ! -e "$ARCHIVE_AZ_FILENAME" || "$(cat ${ARCHIVE_IP_FILENAME})" != "${ARCHIVE_IP}" || "$(($current_time - $(stat --format "%Y" ${ARCHIVE_AZ_FILENAME}) ))" -gt "$(($CACHE_TIMEOUT_SECONDS))" ]]; then
if [[ ! -e "$ID_TO_AZ_FILENAME" || ! -e "$ARCHIVE_AZ_FILENAME" || "$(cat ${ARCHIVE_IP_FILENAME})" != "${ARCHIVE_IP}" || "$(($current_time - $(stat --format "%Y" ${ARCHIVE_AZ_FILENAME}) ))" -gt "$(randomise $CACHE_TIMEOUT_SECONDS)" ]]; then
# Cache instance IDs, archive AZ and the archive IP (as a sort of cache invalidator).
instances=$(aws ec2 describe-instances)
echo "$instances" | jq -r ".Reservations | .[] | .Instances | .[]" | jq -r '"\(.InstanceId) \(.Placement.AvailabilityZone)"' > ${ID_TO_AZ_FILENAME}
@@ -75,10 +79,10 @@ then
status "200"
outputMessage "Healthy: in the same az as the archive"
else
if [[ ! -e "${LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME}" || "$(($current_time - $(stat --format '%Y' ${LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME}) ))" -gt "$TARGET_GROUP_HEALTHCHECK_TIMEOUT_SECONDS"]]; then
if [[ ! -e "${LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME}" || "$(($current_time - $(stat --format '%Y' ${LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME}) ))" -gt "$(randomise $TARGET_GROUP_HEALTHCHECK_TIMEOUT_SECONDS)" ]]; then
# This branch runs if the cached timestamp, of the last target group healthcheck, doesn't exist, or if it exceeds TARGET_GROUP_HEALTHCHECK_TIMEOUT_SECONDS.
healthy_target_exists_in_same_az_as_archive="false"
for instance_id in $(aws elbv2 describe-target-health --target-group-arn ${QUERY_STRING//arn=/} | jq -r '.TargetHealthDescriptions | .[] | select(.TargetHealth.State=="healthy") | .Target.Id'); do ## TODO: Continues iterating if healthy instance is found.
for instance_id in $(aws elbv2 describe-target-health --target-group-arn ${QUERY_STRING//arn=/} | jq -r '.TargetHealthDescriptions | .[] | select(.TargetHealth.State=="healthy") | .Target.Id'); do ## TODO: Stop iterating if healthy instance is found.
healthy_instance_az="$(sed -n "s/$instance_id \(.*\)/\1/p" $ID_TO_AZ_FILENAME)"
if [[ "$healthy_instance_az" == "$(cat $ARCHIVE_AZ_FILENAME)" ]]; then
healthy_target_exists_in_same_az_as_archive="true"
@@ -95,9 +99,9 @@ then
fi
else
# This branch runs in the case that there is a timestamp file but the target group healthcheck has been performed within the TARGET_GROUP_HEALTHCHECK_TIMEOUT_SECONDS.
if [[ -e "${LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME}" && "$(cat $LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME)" == "healthy" ]]; then
if [[ -e "${LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME}" && "$(cat $LAST_TARGET_GROUP_HEALTHCHECK_RESULT_FILENAME)" == "healthy" ]]; then
status "200"
outputMessage "No healthy instance in the same AZ; forcing healthy for a short while."
outputMessage "Using stored healthcheck, value healthy"
else
status "503 Not in the same az"
outputMessage "Unhealthy: Not in the same az as the archive."