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|
# frozen_string_literal: true
module Ci
class BuildTraceChunk < ApplicationRecord
extend ::Gitlab::Ci::Model
include ::FastDestroyAll
include ::Checksummable
include ::Gitlab::ExclusiveLeaseHelpers
belongs_to :build, class_name: "Ci::Build", foreign_key: :build_id
default_value_for :data_store, :redis
CHUNK_SIZE = 128.kilobytes
WRITE_LOCK_RETRY = 10
WRITE_LOCK_SLEEP = 0.01.seconds
WRITE_LOCK_TTL = 1.minute
FailedToPersistDataError = Class.new(StandardError)
# Note: The ordering of this enum is related to the precedence of persist store.
# The bottom item takes the highest precedence, and the top item takes the lowest precedence.
enum data_store: {
redis: 1,
database: 2,
fog: 3
}
class << self
def all_stores
@all_stores ||= self.data_stores.keys
end
def persistable_store
# get first available store from the back of the list
all_stores.reverse.find { |store| get_store_class(store).available? }
end
def get_store_class(store)
@stores ||= {}
@stores[store] ||= "Ci::BuildTraceChunks::#{store.capitalize}".constantize.new
end
##
# FastDestroyAll concerns
def begin_fast_destroy
all_stores.each_with_object({}) do |store, result|
relation = public_send(store) # rubocop:disable GitlabSecurity/PublicSend
keys = get_store_class(store).keys(relation)
result[store] = keys if keys.present?
end
end
##
# FastDestroyAll concerns
def finalize_fast_destroy(keys)
keys.each do |store, value|
get_store_class(store).delete_keys(value)
end
end
end
def data
@data ||= get_data.to_s
end
def truncate(offset = 0)
raise ArgumentError, 'Offset is out of range' if offset > size || offset < 0
return if offset == size # Skip the following process as it doesn't affect anything
self.append("", offset)
end
def append(new_data, offset)
raise ArgumentError, 'New data is missing' unless new_data
raise ArgumentError, 'Offset is out of range' if offset < 0 || offset > size
raise ArgumentError, 'Chunk size overflow' if CHUNK_SIZE < (offset + new_data.bytesize)
in_lock(*lock_params) { unsafe_append_data!(new_data, offset) }
schedule_to_persist! if full?
end
def size
@size ||= @data&.bytesize || current_store.size(self) || data&.bytesize
end
def start_offset
chunk_index * CHUNK_SIZE
end
def end_offset
start_offset + size
end
def range
(start_offset...end_offset)
end
def persist_data!
in_lock(*lock_params) { unsafe_persist_data! }
end
def schedule_to_persist!
return if persisted?
Ci::BuildTraceChunkFlushWorker.perform_async(id)
end
private
def get_data
# Redis / database return UTF-8 encoded string by default
current_store.data(self)&.force_encoding(Encoding::BINARY)
end
def unsafe_persist_data!(new_store = self.class.persistable_store)
return if data_store == new_store.to_s
current_data = data
old_store_class = current_store
unless current_data&.bytesize.to_i == CHUNK_SIZE
raise FailedToPersistDataError, 'Data is not fulfilled in a bucket'
end
self.raw_data = nil
self.data_store = new_store
self.checksum = crc32(current_data)
##
# We need to so persist data then save a new store identifier before we
# remove data from the previous store to make this operation
# trasnaction-safe. `unsafe_set_data! calls `save!` because of this
# reason.
#
# TODO consider using callbacks and state machine to remove old data
#
unsafe_set_data!(current_data)
old_store_class.delete_data(self)
end
def unsafe_set_data!(value)
raise ArgumentError, 'New data size exceeds chunk size' if value.bytesize > CHUNK_SIZE
current_store.set_data(self, value)
@data = value
@size = value.bytesize
save! if changed?
end
def unsafe_append_data!(value, offset)
new_size = value.bytesize + offset
if new_size > CHUNK_SIZE
raise ArgumentError, 'New data size exceeds chunk size'
end
current_store.append_data(self, value, offset).then do |stored|
raise ArgumentError, 'Trace appended incorrectly' if stored != new_size
end
@data = nil
@size = new_size
save! if changed?
end
def persisted?
!redis?
end
def live?
redis?
end
def full?
size == CHUNK_SIZE
end
def current_store
self.class.get_store_class(data_store)
end
def lock_params
["trace_write:#{build_id}:chunks:#{chunk_index}",
{ ttl: WRITE_LOCK_TTL,
retries: WRITE_LOCK_RETRY,
sleep_sec: WRITE_LOCK_SLEEP }]
end
end
end
|
