consul event handler to call plugn

README.md

Consul can send events to each node in the membership. This gist shows how to bind event handlers with plugins.

sending events

consul event -http-addr=<HOST>:8500 -name=start "mycluster"

installing plugins

The nodes can have multiple plugins

event handler

On the consul node start a watch:

consul watch -type=event ./handler.sh

it will call

consul-event-handler.sh

#!/bin/bash

get_field() {
  declare json="$1"
  declare field="$2"

  echo "$json"|jq ".$field" -r
}

process_json() {
  while read json; do
    [[ "$DEBUG" ]] && echo $json

    event=$(get_field $json Name)
    id=$(get_field $json ID)
    payload=$(get_field $json Payload)
    ltime=$(get_field $json LTime)
    version=$(get_field $json Version)
    echo $payload | base64 -d | \
      EVENT_ID=$id \
      EVENT_LTIME=$ltime \
      EVENT_VERSION=$version \
      plugn trigger $event
  done
}

main() {
  while read array ;do
    echo $array | jq .[] -c | process_json
  done
}

[[ "$0" == "$BASH_SOURCE" ]] && main "$@"