space.yaml

name: Python Web Server
location: my-first-location
services:
  - type: vanilla-bash-server
    name: My Bash Web Server VM
    brooklyn.initializers:
      - type: org.apache.brooklyn.core.effector.ssh.SshCommandEffector
        brooklyn.config:
          name: showlog
          description: Show the access log on the index page
          command: >
            grep Logs index.html >/dev/null || {

            echo '<h3>Logs</h3>' >> index.html

            sed -i '/h3.Logs..h3/a <a href="output.txt"><p>Access Log</p></a>'
            index.html

            }
      - type: org.apache.brooklyn.core.effector.ssh.SshCommandEffector
        brooklyn.config:
          name: hidelog
          description: Hide the access log on the index page
          command: |
            sed -i '/h3.Logs..h3/d' index.html
            sed -i '/Access Log/d' index.html
      - type: org.apache.brooklyn.core.effector.ssh.SshCommandEffector
        brooklyn.config:
          name: reset
          description: Reset the access log to be empty
          command: |
            cat /dev/null > output.txt            
      - type: org.apache.brooklyn.core.effector.ssh.SshCommandEffector
        brooklyn.config:
          name: addlink
          description: Add a link to the index page
          command: |
            grep Links index.html >/dev/null || echo '<h3>Links</h3>' >> index.html
            sed -i "/h3.Links..h3/a  <div><a href='${url}'>${text}</a><div>" index.html
          parameters:
            url:
              description: The URL for the link
              defaultValue: https://brooklyn.apache.org/
            text:
              description: The text for the link
              defaultValue: Brooklyn
      - type: org.apache.brooklyn.core.effector.ssh.SshCommandEffector
        brooklyn.config:
         name: space
         description: Add an astronomy photo to the index page
         command: |
           POD=$(curl "https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY" |
           python -c 'import sys, json; print json.load(sys.stdin)["url"]' )
           echo "<div><img src='${POD}'/></div>" >> index.html
      - type: org.apache.brooklyn.core.effector.ssh.SshCommandEffector
        brooklyn.config:
         name: spaceSolution
         description: Add an astronomy photo to the index page
         command: |
           POD=$(curl "https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY&date=${date}" |
           python -c 'import sys, json; print json.load(sys.stdin)["url"]' )
           echo "<div><img src='${POD}'/></div>" >> index.html
         parameters:
           date:
             description: The date for the photo as YYYY-MM-DD              
    brooklyn.config:
      install.command: |
        # install python if not present
        which python || \
          { apt-get update && apt-get install python ; } || \
          { yum update && yum install python ; } || \
          { echo WARNING: cannot install python && exit 1 ; }
      customize.command: |
        # create the web page to serve
        cat > index.html << EOF

        Hello world.
        <p>
        I am ${ENTITY_INFO}, ${MESSAGE:-a Brooklyn sample}.
        <p>
        Created at: `date`
        <p>
        I am running at ${HOSTNAME}, with on-box IP configuration:
        <pre>
        `ifconfig | grep inet`
        </pre>

        EOF
      launch.command: >
        # launch in background (ensuring no streams open), and record PID to
        file

        nohup python -m SimpleHTTPServer ${PORT:-8020} < /dev/null > output.txt
        2>&1 &

        echo $! > ${PID_FILE:-pid.txt}

        sleep 5

        ps -p `cat ${PID_FILE:-pid.txt}`

        if [ $? -ne 0 ] ; then
          cat output.txt
          echo WARNING: python web server not running
          exit 1
        fi
      shell.env:
        HOSTNAME: '$brooklyn:attributeWhenReady("host.name")'
        PORT: '$brooklyn:config("my.app.port")'
        ENTITY_INFO: '$brooklyn:component("this", "")'
        MESSAGE: '$brooklyn:config("my.message")'
      my.app.port: 8020
      my.message: good to meet you
    brooklyn.enrichers:
      - type: org.apache.brooklyn.enricher.stock.Transformer
        brooklyn.config:
          uniqueTag: url-generator
          enricher.sourceSensor: host.subnet.hostname
          enricher.targetSensor: >-
            $brooklyn:sensor("org.apache.brooklyn.core.entity.Attributes",
            "main.uri")
          enricher.targetValue:
            '$brooklyn:formatString':
              - 'http://%s:%s/'
              - '$brooklyn:attributeWhenReady("host.name")'
              - '$brooklyn:config("my.app.port")'