Consul Blocking query example

consul_blocking_query.sh

#!/bin/bash -e

CONSUL_ADDR=${CONSUL_ADDR="http://consul.service.consul:8500"}
CONSUL_ENDPOINT=${CONSUL_ENDPOINT="/v1/catalog/services"}

while true; do
  INDEX_FILE="$(mktemp -t consul_index_)"
  CONSUL_INDEX=$(
curl -isL \
-H 'X-Consul-Index: 1' \
"${CONSUL_ADDR}${CONSUL_ENDPOINT}?index=$CONSUL_INDEX&wait=10s" | \
tee "$INDEX_FILE" | \
grep -i X-Consul-Index | \
sed -e 's/^.*: *//' | \
tr -d '\015')
  echo "X-Consul-Index: ${CONSUL_INDEX}"
  cat $INDEX_FILE | tr -d '\015' | sed -e '1,/^$/d' | jq '.'
  rm -f "$INDEX_FILE"
done