detect.sh

#!/bin/bash


# This script emits the task host:port for the DEPENDENCY_URI relative to the
# MARATHON_APP_ID. This is useful when getting the mongodb host:port in the
# current application pod which is located at '../../database/mongo/tasks'.

## MARATHON_HOSTS
## MARATHON_APP_ID
## DEPENDENCY_URI

if [ -z "$MARATHON_HOSTS" ]; then
  exit -1
fi

if [ -z "$MARATHON_APP_ID" ]; then
  exit -2
fi

if [ -z "$DEPENDENCY_URI" ]; then
  DEPENDENCY_URI="../../database/mongo/tasks"
fi

# get the host:port that serves the mongodb host
for MARATHON_HOST in $MARATHON_HOSTS; do
  DATABASE_TASKS_URL="http://${MARATHON_HOST}/v2/apps${MARATHON_APP_ID}/${DEPENDENCY_URI}"
  TASKS=$(curl -sSfLk -m 10 ${DATABASE_TASKS_URL})
  if [ $? -eq 0 ]; then
    # split by space and echo the task host:port
    echo $TASKS | cut -d ' ' -f 3
    break
  fi
done