Module: Legion::Data::Archiver

Defined in:
lib/legion/data/archiver.rb

Defined Under Namespace

Classes: UploadError

Class Method Summary collapse

Class Method Details

.archive_table(table:, retention_days: 90, batch_size: 1000, storage_backend: nil) ⇒ Object 



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# File 'lib/legion/data/archiver.rb', line 16

def archive_table(table:, retention_days: 90, batch_size: 1000, storage_backend: nil)
  return { skipped: true, reason: 'not_postgres' } unless postgres?

  Legion::Logging.info "Archiving table #{table} (retention: #{retention_days}d)" if defined?(Legion::Logging)

  conn = Legion::Data.connection
  cutoff = Time.now - (retention_days * 86_400)
  now = Time.now.utc

  batches = 0
  total_rows = 0
  paths = []
  batch_n = 0

  loop do
    batch_n += 1
    rows = conn[table].where { created_at < cutoff }.limit(batch_size).all
    break if rows.empty?

    ids = rows.map { |r| r[:id] }
    jsonl = serialize_rows(rows)
    compressed = gzip_compress(jsonl)
    checksum = Digest::SHA256.hexdigest(compressed)
    batch_id = SecureRandom.uuid

    path = upload_batch(
      data:    compressed,
      table:   table.to_s,
      year:    now.year,
      month:   now.month,
      batch_n: batch_n,
      backend: storage_backend
    )

    conn.transaction do
      conn[:archive_manifest].insert(
        batch_id:     batch_id,
        source_table: table.to_s,
        row_count:    rows.size,
        checksum:     checksum,
        storage_path: path,
        archived_at:  now
      )
      conn[table].where(id: ids).delete
    end

    batches += 1
    total_rows += rows.size
    paths << path
  end

  Legion::Logging.info "Archived #{total_rows} rows from #{table} in #{batches} batch(es)" if defined?(Legion::Logging)
  { batches: batches, total_rows: total_rows, paths: paths }
end

.manifest_stats ⇒ Object 



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# File 'lib/legion/data/archiver.rb', line 82

def manifest_stats
  return {} unless postgres?
  return {} unless Legion::Data.connection.table_exists?(:archive_manifest)

  Legion::Data.connection[:archive_manifest]
              .group_and_count(:source_table)
              .select_append(
                Sequel.function(:sum, :row_count).as(:total_rows),
                Sequel.function(:min, :archived_at).as(:earliest),
                Sequel.function(:max, :archived_at).as(:latest)
              )
              .all
              .to_h do |row|
    [row[:source_table], {
      batches:    row[:count],
      total_rows: row[:total_rows].to_i,
      earliest:   row[:earliest],
      latest:     row[:latest]
    }]
  end
end

.upload_batch(data:, table:, year:, month:, batch_n:, backend:) ⇒ Object 



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# File 'lib/legion/data/archiver.rb', line 71

def upload_batch(data:, table:, year:, month:, batch_n:, backend:)
  case backend
  when :s3
    upload_s3(data: data, table: table, year: year, month: month, batch_n: batch_n)
  when :azure
    upload_azure(data: data, table: table, year: year, month: month, batch_n: batch_n)
  else
    upload_tmpdir(data: data, table: table, year: year, month: month, batch_n: batch_n)
  end
end