Script to enable or disable newrelic alerts

new_relic_alert.sh

#!/bin/bash

if [ ! -x /usr/bin/curl ]; then
  echo "Please install curl"
  exit 1
fi

if [ ! -x /usr/bin/jq ]; then
  echo "Please install jq"
  exit 1
fi

if [ ! -x /usr/bin/python ]; then
  echo "Please install python"
  exit 1
fi

if [ ! -x /usr/bin/awk ]; then
  echo "Please install awk"
  exit 1
fi

if [ $# -eq 0 ]; then
  set -- '-h' "$@"
fi


while [[ $# -gt 0 ]]
do

  key="$1"
  case $key in
    -k|--key)
      API_KEY="$2"
      shift
    ;;
    -p|--policy)
      POLICY_NAME="$2"
      shift
    ;;
    -a|--alert)
      ALERT_NAME_IN="$2"
      shift
    ;;
    -e|--enable)
      ENABLED='true'
    ;;
    -d|--disable)
      DISABLED='false'
    ;;
    --add-host|--add-hosts)
      ADD_HOST_IN="$2"
      shift
    ;;
    --rm-host|--rm-hosts)
      RM_HOST_IN="$2"
      shift
    ;;
    --add-application|--add-applications)
      ADD_APM_IN="$2"
      shift
    ;;
    --rm-application|--rm-applications)
      RM_APM_IN="$2"
      shift
    ;;
    --add-channel|--add-channels)
      ADD_CHANNEL_IN="$2"
      shift
    ;;
    --rm-channel|--rm-channels)
      RM_CHANNEL_IN="$2"
      shift
    ;;
    --debug)
      DEBUG=true
    ;;
    -h|--help)
      echo "$0"
      echo " -k, --key <newrelic api key>"
      echo " -p, --policy <policy name>"
      echo " -a, --alert <alert name>"
      echo " -e, --enable"
      echo " -d, --disable"
      echo " --add-host, --add-hosts <hostname>"
      echo " --rm-host, --rm-hosts <hostname>"
      echo " --add-application, --add-applications <apm name>"
      echo " --rm-application, --rm-applications <apm name>"
      echo " --add-channel, --add-channels <channel name>"
      echo " --rm-channel, --rm-channels <channel name>"
      echo " --debug"
      echo " -h, --help"
      exit 1
    ;;
    *)
      echo "$key: unknown option"
      echo "Use: $0 --help"
      exit 1
    ;;
  esac
  shift
done

if [ -n "$ENABLED" ] && [ -n "$DISABLED" ]; then
  echo "Use -d or -e"
  exit 1
elif [ -n "$ENABLED" ]; then
  ALERT_ENABLED=$ENABLED
elif [ -n "$DISABLED" ]; then
  ALERT_ENABLED=$DISABLED
fi

if [ -z "$API_KEY" ]; then echo "key not defined"; exit 1; fi
if [ -z "$POLICY_NAME" ]; then echo "policy name not defined"; exit 1; fi
#if [ -z "$ALERT_NAME_IN" ]; then echo "alert name not defined"; exit 1; fi
#if [ -z "$ADD_HOST_IN" ]; then echo "alert name not defined"; exit 1; fi
#if [ -z "$ALERT_ENABLED" ]; then echo "you must specify enable or disable"; exit 1; fi

if [ -n "$DEBUG" ]; then
  echo "API KEY: $API_KEY"
  echo "POLICY NAME: $POLICY_NAME"
  echo "ALERT NAME: $ALERT_NAME_IN"
  echo "ALERT ENABLED: $ALERT_ENABLED"
  echo "ADD HOST IN: $ADD_HOST_IN"
  echo "RM HOST IN: $RM_HOST_IN"
  echo "ADD APM IN: $ADD_APM_IN"
  echo "RM APM IN: $RM_APM_IN"
  echo "ADD CHANNEL IN: $ADD_CHANNEL_IN"
  echo "RM CHANNEL IN: $RM_CHANNEL_IN"
fi

POLICY_ESCAPED=$(python -c "import urllib; print urllib.quote('''${POLICY_NAME}''')")
if [ -n "$DEBUG" ]; then echo "POLICY ESCAPED: $POLICY_ESCAPED"; fi

POLICY_ID=$(curl -X GET 'https://api.newrelic.com/v2/alerts_policies.json' -H "X-Api-Key: ${API_KEY}" -s -G -d "filter[name]=${POLICY_ESCAPED}" | jq '.policies[0] .id')
if [ -n "$DEBUG" ]; then echo "POLICY ID: $POLICY_ID"; fi

if [ $POLICY_ID != 'null' ]; then
  OIFS=$IFS
  IFS=','
  if [ -n "$ALERT_NAME_IN" ]; then
    for ALERT_NAME in $ALERT_NAME_IN
    do
      echo "$ALERT_NAME"
      ALERT_JSON=$(curl -X GET 'https://api.newrelic.com/v2/alerts_conditions.json' -H "X-Api-Key: ${API_KEY}" -s -G -d "policy_id=${POLICY_ID}" | jq --arg name "${ALERT_NAME}" '.conditions[] | select(.name | contains($name))')
      if [ -n "$DEBUG" ]; then echo "ALERT_JSON: $ALERT_JSON"; fi

      if [ -n "$ALERT_JSON" ]; then
        ALERT_ID=$(echo "${ALERT_JSON}" | jq '.id')
        if [ -n "$DEBUG" ]; then echo "ALERT ID: $ALERT_ID"; fi

        if [ -n "$ALERT_ENABLED" ]; then
          ALERT_JSON=$(echo "${ALERT_JSON}" | jq --arg enabled ${ALERT_ENABLED} '.enabled = $enabled')
          if [ -n "$DEBUG" ]; then echo "ALERT NEW JSON: $ALERT_JSON"; fi
        fi

        if [ -n "$ADD_HOST_IN" ]; then
          for HOST in $ADD_HOST_IN
          do
            SERVER_ID=$(curl -X GET 'https://api.newrelic.com/v2/servers.json' -H "X-Api-Key: ${API_KEY}" -s -G -d "filter[host]=${HOST}"  | jq '.servers[0] .id')
            if [ -n "$DEBUG" ]; then echo "SERVER ID: $SERVER_ID"; fi
            ALERT_JSON=$(echo "${ALERT_JSON}" | jq --arg server_id ${SERVER_ID} '.entities += [$server_id]')
            if [ -n "$DEBUG" ]; then echo "ALERT NEW JSON: $ALERT_JSON"; fi
          done
        fi

        if [ -n "$RM_HOST_IN" ]; then
          for HOST in $RM_HOST_IN
          do
            SERVER_ID=$(curl -X GET 'https://api.newrelic.com/v2/servers.json' -H "X-Api-Key: ${API_KEY}" -s -G -d "filter[host]=${HOST}"  | jq '.servers[0] .id')
            if [ -n "$DEBUG" ]; then echo "SERVER ID: $SERVER_ID"; fi
            ALERT_JSON=$(echo "${ALERT_JSON}" | jq --arg server_id ${SERVER_ID} '.entities -= [$server_id]')
            if [ -n "$DEBUG" ]; then echo "ALERT NEW JSON: $ALERT_JSON"; fi
          done
        fi

        if [ -n "$ADD_APM_IN" ]; then
          for APM in $ADD_APM_IN
          do
            APM_ID=$(curl -X GET 'https://api.newrelic.com/v2/applications.json' -H "X-Api-Key: ${API_KEY}" -s -G -d "filter[name]=${APM}"  | jq '.applications[0] .id')
            if [ -n "$DEBUG" ]; then echo "APM ID: $APM_ID"; fi
            ALERT_JSON=$(echo "${ALERT_JSON}" | jq --arg apm_id ${APM_ID} '.entities += [$apm_id]')
            if [ -n "$DEBUG" ]; then echo "ALERT NEW JSON: $ALERT_JSON"; fi
          done
        fi

        if [ -n "$RM_APM_IN" ]; then
          for APM in $RM_APM_IN
          do
            APM_ID=$(curl -X GET 'https://api.newrelic.com/v2/applications.json' -H "X-Api-Key: ${API_KEY}" -s -G -d "filter[name]=${APM}"  | jq '.applications[0] .id')
            if [ -n "$DEBUG" ]; then echo "APM ID: $APM_ID"; fi
            ALERT_JSON=$(echo "${ALERT_JSON}" | jq --arg apm_id ${APM_ID} '.entities -= [$apm_id]')
            if [ -n "$DEBUG" ]; then echo "ALERT NEW JSON: $ALERT_JSON"; fi
          done
        fi

        ALERT_JSON=$(echo "${ALERT_JSON}" | jq 'del(.id) | { condition: . }')
        if [ -n "$DEBUG" ]; then echo "ALERT NEW JSON: $ALERT_JSON"; fi

        RESPONSE=$(curl -X PUT "https://api.newrelic.com/v2/alerts_conditions/${ALERT_ID}.json" -H "X-Api-Key: ${API_KEY}" -s -i -H 'Content-Type: application/json' -d "${ALERT_JSON}")
        if [ -n "$DEBUG" ]; then echo "RESPONSE: $RESPONSE"; fi
        CODE=$(echo "$RESPONSE" | grep 'HTTP' | awk '{print $2}')

        if [ $CODE -ne 200 ]; then
          exit 1
        fi

      else
        echo 'Invalid alert name'
        exit 1
      fi
    done
  fi

  if [ -n "$ADD_CHANNEL_IN" ]; then
    for CHANNEL in $ADD_CHANNEL_IN
    do
      CHANNEL_ID=$(curl -X GET 'https://api.newrelic.com/v2/alerts_channels.json' -H "X-Api-Key: ${API_KEY}" -s | jq --arg channel ${CHANNEL} '.channels[] | select(.name | contains($channel)) | .id')
      if [ -n "$DEBUG" ]; then echo "CHANNEL ID: $CHANNEL_ID"; fi
      if [ -n "$CHANNEL_ID" ]; then
        OUTPUT=$(curl -X PUT 'https://api.newrelic.com/v2/alerts_policy_channels.json' -H "X-Api-Key: ${API_KEY}" -s -H 'Content-Type: application/json' -G -d "policy_id=${POLICY_ID}&channel_ids=${CHANNEL_ID}")
        if [ -n "$DEBUG" ]; then echo "OUTPUT CHANNEL: $OUTPUT"; fi
      else
        echo "$CHANNEL not found"
      fi
    done
  fi

  if [ -n "$RM_CHANNEL_IN" ]; then
    for CHANNEL in $RM_CHANNEL_IN
    do
      CHANNEL_ID=$(curl -X GET 'https://api.newrelic.com/v2/alerts_channels.json' -H "X-Api-Key: ${API_KEY}" -s | jq --arg channel ${CHANNEL} '.channels[] | select(.name | contains($channel)) | .id')
      if [ -n "$DEBUG" ]; then echo "CHANNEL ID: $CHANNEL_ID"; fi
      if [ -n "$CHANNEL_ID" ]; then
        OUTPUT=$(curl -X DELETE 'https://api.newrelic.com/v2/alerts_policy_channels.json' -H "X-Api-Key: ${API_KEY}" -s -H 'Content-Type: application/json' -G -d "policy_id=${POLICY_ID}&channel_id=${CHANNEL_ID}")
        if [ -n "$DEBUG" ]; then echo "OUTPUT CHANNEL: $OUTPUT"; fi
      else
        echo "$CHANNEL not found"
      fi
    done
  fi

  IFS=$OIFS
else
  echo 'Invalid policy name'
  exit 1
fi

Can you explain how to use the script?