Class: Pvectl::Services::ResizeVolume

Inherits:
Object
  • Object
show all
Defined in:
lib/pvectl/services/resize_volume.rb,
sig/pvectl/services/resize_volume.rbs

Overview

Orchestrates volume resize operations for VMs and containers.

Handles size parsing, preflight validation (current size comparison), and execution via the repository interface. Works polymorphically with both VM and Container repositories (they share #fetch_config and #resize).

Two-phase operation:

  1. #preflight — validates volume exists, computes new size, checks constraints
  2. #perform — executes the actual resize via repository

Examples:

Basic resize flow

parsed = ResizeVolume.parse_size("+10G")
service = ResizeVolume.new(repository: vm_repo)
info = service.preflight(100, "scsi0", parsed, node: "pve1")
result = service.perform(100, "scsi0", parsed.raw, node: "pve1")

Defined Under Namespace

Classes: ParsedSize, SizeTooSmallError, VolumeNotFoundError

Constant Summary collapse

SIZE_PATTERN =

Size regex: optional +, digits with optional decimal, optional T/G/M/K suffix.

/\A(\+)?(\d+(?:\.\d+)?)([TGMK])?\z/i
UNIT_MULTIPLIERS =

Multipliers for converting units to megabytes (MB as base unit).

{
  "T" => 1024 * 1024,
  "G" => 1024,
  "M" => 1,
  "K" => 1.0 / 1024
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(repository:) ⇒ ResizeVolume

Creates a new ResizeVolume service.



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# File 'lib/pvectl/services/resize_volume.rb', line 96

def initialize(repository:)
  @repository = repository
end

Class Method Details

.parse_size(size_str) ⇒ ParsedSize

Parses a size string into a ParsedSize.

Accepts formats like "10G", "+10G", "1.5T", "512M", "+100". Suffix is uppercased. No suffix means raw number.

Examples:

Relative size

ResizeVolume.parse_size("+10G")
#=> ParsedSize(relative: true, value: "10G", raw: "+10G")

Absolute size

ResizeVolume.parse_size("50G")
#=> ParsedSize(relative: false, value: "50G", raw: "50G")

Raises:

  • (ArgumentError) —

    if format is invalid, empty, or negative



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# File 'lib/pvectl/services/resize_volume.rb', line 72

def self.parse_size(size_str)
  raise ArgumentError, "Size cannot be empty" if size_str.nil? || size_str.strip.empty?

  match = SIZE_PATTERN.match(size_str.strip)
  raise ArgumentError, "Invalid size format: #{size_str}" unless match

  plus, number, suffix = match.captures
  suffix = suffix&.upcase

  raise ArgumentError, "Size must be positive: #{size_str}" if number.to_f <= 0

  clean_value = "#{number}#{suffix}"
  raw_value = "#{plus}#{number}#{suffix}"

  ParsedSize.new(
    relative: !plus.nil?,
    value: clean_value,
    raw: raw_value
  )
end

Instance Method Details

#calculate_new_size(current_size, parsed_size) ⇒ String

Calculates the new size after resize.

For relative sizes, adds the increment to current size (converting units as needed). For absolute sizes, returns the parsed value directly.



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# File 'lib/pvectl/services/resize_volume.rb', line 177

def calculate_new_size(current_size, parsed_size)
  if parsed_size.relative?
    current_num, current_suffix = parse_size_components(current_size)
    add_num, add_suffix = parse_size_components(parsed_size.value)

    converted_add = convert_to_unit(add_num, add_suffix, current_suffix)
    new_num = current_num + converted_add

    format_size(new_num, current_suffix)
  else
    parsed_size.value
  end
end

#convert_to_unit(value, from_unit, to_unit) ⇒ Float

Converts a value from one unit to another using MB as base.



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# File 'lib/pvectl/services/resize_volume.rb', line 226

def convert_to_unit(value, from_unit, to_unit)
  mb_value = value * UNIT_MULTIPLIERS.fetch(from_unit, 1024)
  mb_value / UNIT_MULTIPLIERS.fetch(to_unit, 1024)
end

#extract_disk_size(config, disk, id) ⇒ String

Extracts the disk size from a config value string.

Config values have formats like:

  • VM: "local-lvm:vm-100-disk-0,size=32G"
  • Container: "local-lvm:subvol-100-disk-0,size=8G"
  • Rootfs: "local-lvm:subvol-100-disk-0,size=8G"

Raises:



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# File 'lib/pvectl/services/resize_volume.rb', line 159

def extract_disk_size(config, disk, id)
  disk_value = config[disk.to_sym]
  raise VolumeNotFoundError, "Volume '#{disk}' not found in config for resource #{id}" unless disk_value

  size_match = disk_value.to_s.match(/size=(\d+(?:\.\d+)?[TGMK]?)/i)
  raise VolumeNotFoundError, "Cannot determine size for volume '#{disk}' on resource #{id}" unless size_match

  size_match[1]
end

#format_size(value, suffix) ⇒ String

Formats a numeric value and suffix into a size string.

Produces integer format when possible (e.g., "42G" not "42.0G").



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# File 'lib/pvectl/services/resize_volume.rb', line 238

def format_size(value, suffix)
  formatted = value == value.to_i ? value.to_i.to_s : format("%.1f", value)
  "#{formatted}#{suffix}"
end

#parse_size_components(size) ⇒ Array(Float, String)

Parses size string into numeric value and unit suffix.



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# File 'lib/pvectl/services/resize_volume.rb', line 213

def parse_size_components(size)
  match = size.to_s.match(/\A(\d+(?:\.\d+)?)([TGMK])?\z/i)
  return [0.0, "G"] unless match

  [match[1].to_f, (match[2] || "G").upcase]
end

#perform(id, disk, raw_size, node:) ⇒ Models::OperationResult

Executes the disk resize via repository.



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# File 'lib/pvectl/services/resize_volume.rb', line 129

def perform(id, disk, raw_size, node:)
  @repository.resize(id, node, disk: disk, size: raw_size)
  Models::OperationResult.new(
    operation: :resize_volume,
    success: true,
    resource: { id: id, node: node, disk: disk, size: raw_size }
  )
rescue StandardError => e
  Models::OperationResult.new(
    operation: :resize_volume,
    success: false,
    error: e.message,
    resource: { id: id, node: node, disk: disk }
  )
end

#preflight(id, disk, parsed_size, node:) ⇒ Hash

Validates the resize operation and returns size information.

Checks that the disk exists in the resource config, extracts current size, calculates new size, and validates constraints (absolute must be larger than current).

Raises:



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# File 'lib/pvectl/services/resize_volume.rb', line 113

def preflight(id, disk, parsed_size, node:)
  config = @repository.fetch_config(node, id)
  current_size = extract_disk_size(config, disk, id)
  new_size = calculate_new_size(current_size, parsed_size)
  validate_new_size!(current_size, new_size, parsed_size)

  { disk: disk, current_size: current_size, new_size: new_size }
end

#size_to_bytes(size) ⇒ Float

Converts a size string to bytes for comparison.



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# File 'lib/pvectl/services/resize_volume.rb', line 247

def size_to_bytes(size)
  num, suffix = parse_size_components(size)
  num * UNIT_MULTIPLIERS.fetch(suffix, 1024) * 1024 * 1024 # MB to bytes
end

#validate_new_size!(current_size, new_size, parsed_size) ⇒ void

This method returns an undefined value.

Validates that the new size is larger than current for absolute resizes.

Relative sizes always pass (Proxmox enforces positive increments). Absolute sizes must be strictly larger than current.

Raises:



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# File 'lib/pvectl/services/resize_volume.rb', line 200

def validate_new_size!(current_size, new_size, parsed_size)
  return if parsed_size.relative?

  if size_to_bytes(new_size) <= size_to_bytes(current_size)
    raise SizeTooSmallError,
          "New size #{new_size} must be larger than current size #{current_size}"
  end
end