Scale build resources manually using a procedure

procedure 'ManualResourcePoolScaling', {
  description = '''Scale build resources (agents) in a specified resource pool.
'''
  jobNameTemplate = ''
  projectName = 'CloudBees'
  resourceName = 'local'
  timeLimit = '0'
  timeLimitUnits = 'minutes'
  workspaceName = ''

  formalParameter 'RESOURCE_POOL', defaultValue: '', {
    description = '''Provide the name of the resource pool to scale.

<b>IMPORTANT:</b> This resource pool must already exist. If it does not, the procedure fails.
'''
    expansionDeferred = '0'
    label = 'Resource pool name'
    orderIndex = '1'
    renderCondition = null
    required = '1'
    type = 'entry'
  }

  formalParameter 'MAX_SIZE', defaultValue: '', {
    description = '''Specify the maximum number of resources to allow for the resource pool. This value <b>must</b> be a positive integer.

<b>IMPORTANT:</b> Allowing a significantly high number of resources to be created may greatly increase resource consumption in your environment.
'''
    expansionDeferred = '0'
    label = 'Maximum number of resources'
    orderIndex = '2'
    renderCondition = null
    required = '1'
    type = 'entry'
  }

  formalParameter 'DESIRED_SIZE', defaultValue: '', {
    description = '''Specify the desired number of resources for the resource pool. This value <b>must</b> be:
&#8226; A positive integer.
&#8226; Not equal to the current resource count.
&#8226; Less than or equal to <b>Maximum number of resources</b>.
&#8226; Greater than or equal to <b>Minimum number of resources</b>.

<b>IMPORTANT</b>:
&#8226; If the number of resources in the pool is <b><u>less</u></b> than <b>Desired number of resources</b>, new resources are created until the resource count reaches <b>Desired number of resources</b> or <b>Maximum number of resources</b>, whichever is less.
&#8226; If the number of resources in the pool is <b><u>more</u></b> than <b>Desired number of resources</b>, resources are removed until the pool reaches <b>Desired number of resources</b> or <b>Minimum number of resources</b>, whichever is greater.
'''
    expansionDeferred = '0'
    label = 'Desired number of resources'
    orderIndex = '3'
    renderCondition = null
    required = '1'
    type = 'entry'
  }

  formalParameter 'MIN_SIZE', defaultValue: '', {
    description = 'The minimum number of resources to leave present in the resource pool. This value <b>must</b> be a positive integer.'
    expansionDeferred = '0'
    label = 'Minimum number of resources'
    orderIndex = '4'
    renderCondition = null
    required = '1'
    type = 'entry'
  }

  step 'scale', {
    description = 'Scales the number of resources within a resource pool.'
    alwaysRun = '0'
    broadcast = '0'
    command = '''APISERVER=https://kubernetes.default.svc
TOKEN=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)
NAMESPACE=$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace)

REPLICA_COUNT=$(curl -k -X GET $APISERVER/apis/apps/v1/namespaces/$NAMESPACE/statefulsets/$[RESOURCE_POOL]/scale -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" | grep -o \'"replicas": [0-9]*\' | head -n 1 | grep -o \'[0-9]*\')

if [ "$[DESIRED_SIZE]" -gt "$[MAX_SIZE]" ]; then
  echo "Desired size ($[DESIRED_SIZE]) is greater than the maximum allowed size ($[MAX_SIZE]). No new resources were created."
  exit 1
elif [ "$[DESIRED_SIZE]" -lt "$[MIN_SIZE]" ]; then
  echo "Desired size ($[DESIRED_SIZE]) is less than the minimum allowed size ($[MIN_SIZE]). No resources were removed."
  exit 1

elif [ "$[DESIRED_SIZE]" -eq "$REPLICA_COUNT" ]; then
  echo "Desired size ($[DESIRED_SIZE]) is equal to the current replica count ($REPLICA_COUNT). No resources were created or removed."
  exit 1
else

  # Set replica count to the desired size
  REPLICA_COUNT=$[DESIRED_SIZE]

  # Update the replica count with PATCH
  response=$(curl -k -s -o /dev/null -w "%{http_code}" -X PATCH "$APISERVER/apis/apps/v1/namespaces/$NAMESPACE/statefulsets/$[RESOURCE_POOL]/scale"     -H "Authorization: Bearer $TOKEN"     -H "Content-Type: application/merge-patch+json"     -d "{\\"spec\\": {\\"replicas\\": $REPLICA_COUNT}}")

  # Check the HTTP response code
  if [ "$response" -ne 200 ]; then
    echo "Error: Failed to scale the statefulset. HTTP response code: $response"
    exit 1
  fi

  echo "Resource in Resource Pool updated to $REPLICA_COUNT."
fi

'''
    condition = null
    errorHandling = 'failProcedure'
    exclusiveMode = 'none'
    logFileName = ''
    parallel = '0'
    postProcessor = ''
    precondition = null
    procedureName = 'ManualResourcePoolScaling'
    releaseMode = 'none'
    resourceName = ''
    shell = 'bash'
    subprocedure = null
    subproject = null
    timeLimit = '0'
    timeLimitUnits = 'seconds'
    workingDirectory = ''
    workspaceName = ''
  }
}
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