Class: Prdigest::DeliveryCheckpointStore

Inherits:
Object
  • Object
show all
Defined in:
lib/prdigest/delivery_checkpoint_store.rb

Defined Under Namespace

Classes: Session

Constant Summary collapse

SCHEMA = 
"prdigest-delivery-checkpoint"
SCHEMA_VERSION = 
1

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(root:) ⇒ DeliveryCheckpointStore

Returns a new instance of DeliveryCheckpointStore.



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# File 'lib/prdigest/delivery_checkpoint_store.rb', line 101

def initialize(root:)
  @root = File.expand_path(root)
end

Class Method Details

.atomic_write(path, content) ⇒ Object 



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# File 'lib/prdigest/delivery_checkpoint_store.rb', line 139

def self.atomic_write(path, content)
  directory = File.dirname(path)
  temporary = "#{path}.tmp-#{Process.pid}-#{Thread.current.object_id}"
  File.open(temporary, File::WRONLY | File::CREAT | File::EXCL, 0o600) do |file|
    file.write(content)
    file.flush
    file.fsync
  end
  File.rename(temporary, path)
  File.chmod(0o600, path)
  File.open(directory, File::RDONLY, &:fsync)
ensure
  File.unlink(temporary) if temporary && File.exist?(temporary)
end

Instance Method Details

#with_checkpoint(date:, chat_id:, scope:, chunks:) ⇒ Object 



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# File 'lib/prdigest/delivery_checkpoint_store.rb', line 105

def with_checkpoint(date:, chat_id:, scope:, chunks:)
  normalized_date = Date.iso8601(date.to_s)
  ensure_root!
  path = File.join(@root, "#{normalized_date}.json")
  lock_path = File.join(@root, "#{normalized_date}.lock")

  File.open(lock_path, File::RDWR | File::CREAT, 0o600) do |lock|
    File.chmod(0o600, lock_path)
    unless lock.flock(File::LOCK_EX | File::LOCK_NB)
      raise SendError.new(
        "delivery checkpoint is already active",
        kind: "delivery_checkpoint",
        delivery: { accepted_chunks: 0, total_chunks: Array(chunks).length, status: "pending" }
      )
    end

    data = load_or_create(
      path,
      date: normalized_date,
      chat_id: Integer(chat_id),
      scope: Array(scope).map(&:to_s),
      chunks: Array(chunks).map(&:to_s)
    )
    fail_if_unavailable!(data)
    yield Session.new(path: path, data: data)
  ensure
    lock.flock(File::LOCK_UN)
  end
rescue SendError, StateError
  raise
rescue StandardError => e
  raise StateError, "cannot access delivery checkpoint (#{e.class})"
end