dockernodeps

#!/usr/bin/env bash

# {{ ansible_managed }}

set -u 
set -e 
set -o pipefail

ALL=false
CONTAINERFOUND=false

# --------------------------------------------------------------------------------------

# parse parameters 

if [[ $# = 0 ]] ; then
	echo ""
	echo "Usage:"
	echo "$0 [-a] <SERVICE_NAME>"
	echo ""
	echo "Example:"
	echo "$0 stack1_influxdb"
	echo "$0 -a stack1_influxdb"
	echo ""
	echo "Returns the docker node-id and the container-id in format NODE-ID:CONTAINER-ID running the given service as parameter."
	echo "If the option '-a' is not used, the search exits with the first pair found."
	exit 1
fi

for PARAMETER in $@ ; do 
	case $1 in 
		-a)
		    ALL=true
        shift
		    ;;
		*_*)
			  SERVICENAME=$1
			  shift
        ;;
    *) 
		    echo "$1 is not a valid parameter. Run $0 without parameters to get usage."
		    exit 1
		    ;;
	esac
done

# --------------------------------------------------------------------------------------

# check if ssh-agent contains key
if ! ssh-add -l >/dev/null ; then
	echo ssh-agent does not contain key. Be sure to use key-forwarding with ssh.
	exit 1
fi

# --------------------------------------------------------------------------------------


# --------------------------------------------------------------------------------------
# parse docker nodes running the service
for NODEID in $(docker node ls -q) ; do 
        if [[ $(docker service ps -f "node=$NODEID" --format "{{.CurrentState}}" "$SERVICENAME" 2>/dev/null | grep -cw 'Running') > 0 ]] ; then
		NODENAME=$(docker node ls --format {{.Hostname}} -f id=$NODEID)
		CONTAINERIDCOMMAND="docker ps -q -f status=running --filter name=$SERVICENAME 2>/dev/null"
		CONTAINERID=$(ssh "$NODENAME" "$CONTAINERIDCOMMAND")
		CONTAINERFOUND=true
		if $ALL ; then 
		  echo "${NODENAME}:${CONTAINERID}"
    else
      RETURN="${NODENAME}:${CONTAINERID}"  
		fi
	fi 
done

# --------------------------------------------------------------------------------------
# OUTPUT

if $CONTAINERFOUND ; then
  if ! $ALL ; then
    echo $RETURN
  fi
	exit 0
else
	echo "no container with running $SERVICENAME found in this swarm."
	exit 1
fi