Class: Tebako::LayerPlanner

Inherits:
Object
  • Object
show all
Defined in:
lib/tebako/layer_planner.rb

Overview

Produces a deterministic, bounded set of independently cached package layers.

Defined Under Namespace

Classes: Layer

Constant Summary collapse

SCHEMA_VERSION = 
1
DEFAULT_MAX_LAYERS = 
12
DEFAULT_MIN_LAYER_SIZE = 
256 * 1024
SEMANTIC_DIRECTORIES = 
%w[app assets config lib public views].freeze

Instance Method Summary collapse

Constructor Details

#initialize(data_src_dir:, ruby_api_version:, workspace:, strategy: "coarse", max_layers: DEFAULT_MAX_LAYERS, min_layer_size: DEFAULT_MIN_LAYER_SIZE, single_mount: false) ⇒ LayerPlanner

Returns a new instance of LayerPlanner.



23
24
25
26
27
28
29
30
31
32
 
# File 'lib/tebako/layer_planner.rb', line 23

def initialize(data_src_dir:, ruby_api_version:, workspace:, strategy: "coarse",
               max_layers: DEFAULT_MAX_LAYERS, min_layer_size: DEFAULT_MIN_LAYER_SIZE, single_mount: false)
  @data_src_dir = data_src_dir
  @ruby_api_version = ruby_api_version
  @workspace = workspace
  @strategy = strategy
  @max_layers = max_layers
  @min_layer_size = min_layer_size
  @single_mount = single_mount
end

Instance Method Details

#plan ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/tebako/layer_planner.rb', line 34

def plan
  layers = if @single_mount
             [Layer.new(mount_point: "application", source: @data_src_dir, category: "application_capsule")]
           else
             @strategy == "semantic" ? semantic_plan : coarse_plan
           end
  status = @single_mount ? "capsule" : @strategy
  Tebako::BuildReporter.record(
    stage: "layer_plan",
    status: status,
    reason: "#{layers.length} deterministic application layers selected",
    details: {
      "schema_version" => SCHEMA_VERSION,
      "layers" => layers.map(&:mount_point)
    }
  )
  layers
rescue SystemCallError => e
  Tebako::BuildReporter.record(
    stage: "layer_plan",
    status: "fallback",
    reason: "semantic planning failed; using coarse layers: #{e.message}"
  )
  coarse_plan
end