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| 1 | +require "concurrent" |
| 2 | +require "forwardable" |
| 3 | +require "ldclient-rb/impl/dependency_tracker" |
| 4 | +require "ldclient-rb/interfaces" |
| 5 | +require "set" |
| 6 | + |
| 7 | +module LaunchDarkly |
| 8 | + module Impl |
| 9 | + module DataSource |
| 10 | + class StatusProvider |
| 11 | + include LaunchDarkly::Interfaces::DataSource::StatusProvider |
| 12 | + |
| 13 | + extend Forwardable |
| 14 | + def_delegators :@status_broadcaster, :add_listener, :remove_listener |
| 15 | + |
| 16 | + def initialize(status_broadcaster, update_sink) |
| 17 | + # @type [Broadcaster] |
| 18 | + @status_broadcaster = status_broadcaster |
| 19 | + # @type [UpdateSink] |
| 20 | + @data_source_update_sink = update_sink |
| 21 | + end |
| 22 | + |
| 23 | + def status |
| 24 | + @data_source_update_sink.current_status |
| 25 | + end |
| 26 | + end |
| 27 | + |
| 28 | + class UpdateSink |
| 29 | + include LaunchDarkly::Interfaces::DataSource::UpdateSink |
| 30 | + |
| 31 | + # @return [LaunchDarkly::Interfaces::DataSource::Status] |
| 32 | + attr_reader :current_status |
| 33 | + |
| 34 | + def initialize(data_store, status_broadcaster, flag_change_broadcaster) |
| 35 | + # @type [LaunchDarkly::Interfaces::FeatureStore] |
| 36 | + @data_store = data_store |
| 37 | + # @type [Broadcaster] |
| 38 | + @status_broadcaster = status_broadcaster |
| 39 | + # @type [Broadcaster] |
| 40 | + @flag_change_broadcaster = flag_change_broadcaster |
| 41 | + @dependency_tracker = LaunchDarkly::Impl::DependencyTracker.new |
| 42 | + |
| 43 | + @mutex = Mutex.new |
| 44 | + @current_status = LaunchDarkly::Interfaces::DataSource::Status.new( |
| 45 | + LaunchDarkly::Interfaces::DataSource::Status::INITIALIZING, |
| 46 | + Time.now, |
| 47 | + nil) |
| 48 | + end |
| 49 | + |
| 50 | + def init(all_data) |
| 51 | + old_data = nil |
| 52 | + monitor_store_update do |
| 53 | + if @flag_change_broadcaster.has_listeners? |
| 54 | + old_data = {} |
| 55 | + LaunchDarkly::ALL_KINDS.each do |kind| |
| 56 | + old_data[kind] = @data_store.all(kind) |
| 57 | + end |
| 58 | + end |
| 59 | + |
| 60 | + @data_store.init(all_data) |
| 61 | + end |
| 62 | + |
| 63 | + update_full_dependency_tracker(all_data) |
| 64 | + |
| 65 | + return if old_data.nil? |
| 66 | + |
| 67 | + send_change_events( |
| 68 | + compute_changed_items_for_full_data_set(old_data, all_data) |
| 69 | + ) |
| 70 | + end |
| 71 | + |
| 72 | + def upsert(kind, item) |
| 73 | + monitor_store_update { @data_store.upsert(kind, item) } |
| 74 | + |
| 75 | + # TODO(sc-197908): We only want to do this if the store successfully |
| 76 | + # updates the record. |
| 77 | + @dependency_tracker.update_dependencies_from(kind, item[:key], item) |
| 78 | + if @flag_change_broadcaster.has_listeners? |
| 79 | + affected_items = Set.new |
| 80 | + @dependency_tracker.add_affected_items(affected_items, {kind: kind, key: item[:key]}) |
| 81 | + send_change_events(affected_items) |
| 82 | + end |
| 83 | + end |
| 84 | + |
| 85 | + def delete(kind, key, version) |
| 86 | + monitor_store_update { @data_store.delete(kind, key, version) } |
| 87 | + |
| 88 | + @dependency_tracker.update_dependencies_from(kind, key, nil) |
| 89 | + if @flag_change_broadcaster.has_listeners? |
| 90 | + affected_items = Set.new |
| 91 | + @dependency_tracker.add_affected_items(affected_items, {kind: kind, key: key}) |
| 92 | + send_change_events(affected_items) |
| 93 | + end |
| 94 | + end |
| 95 | + |
| 96 | + def update_status(new_state, new_error) |
| 97 | + return if new_state.nil? |
| 98 | + |
| 99 | + status_to_broadcast = nil |
| 100 | + |
| 101 | + @mutex.synchronize do |
| 102 | + old_status = @current_status |
| 103 | + |
| 104 | + if new_state == LaunchDarkly::Interfaces::DataSource::Status::INTERRUPTED && old_status.state == LaunchDarkly::Interfaces::DataSource::Status::INITIALIZING |
| 105 | + # See {LaunchDarkly::Interfaces::DataSource::UpdateSink#update_status} for more information |
| 106 | + new_state = LaunchDarkly::Interfaces::DataSource::Status::INITIALIZING |
| 107 | + end |
| 108 | + |
| 109 | + unless new_state == old_status.state && new_error.nil? |
| 110 | + @current_status = LaunchDarkly::Interfaces::DataSource::Status.new( |
| 111 | + new_state, |
| 112 | + new_state == current_status.state ? current_status.state_since : Time.now, |
| 113 | + new_error.nil? ? current_status.last_error : new_error |
| 114 | + ) |
| 115 | + status_to_broadcast = current_status |
| 116 | + end |
| 117 | + end |
| 118 | + |
| 119 | + @status_broadcaster.broadcast(status_to_broadcast) unless status_to_broadcast.nil? |
| 120 | + end |
| 121 | + |
| 122 | + private def update_full_dependency_tracker(all_data) |
| 123 | + @dependency_tracker.reset |
| 124 | + all_data.each do |kind, items| |
| 125 | + items.each do |key, item| |
| 126 | + @dependency_tracker.update_dependencies_from(kind, item.key, item) |
| 127 | + end |
| 128 | + end |
| 129 | + end |
| 130 | + |
| 131 | + |
| 132 | + # |
| 133 | + # Method to monitor updates to the store. You provide a block to update |
| 134 | + # the store. This mthod wraps that block, catching and re-raising all |
| 135 | + # errors, and notifying all status listeners of the error. |
| 136 | + # |
| 137 | + private def monitor_store_update |
| 138 | + begin |
| 139 | + yield |
| 140 | + rescue => e |
| 141 | + error_info = LaunchDarkly::Interfaces::DataSource::ErrorInfo.new(LaunchDarkly::Interfaces::DataSource::ErrorInfo::STORE_ERROR, 0, e.to_s, Time.now) |
| 142 | + update_status(LaunchDarkly::Interfaces::DataSource::Status::INTERRUPTED, error_info) |
| 143 | + raise |
| 144 | + end |
| 145 | + end |
| 146 | + |
| 147 | + |
| 148 | + # |
| 149 | + # @param [Hash] old_data |
| 150 | + # @param [Hash] new_data |
| 151 | + # @return [Set] |
| 152 | + # |
| 153 | + private def compute_changed_items_for_full_data_set(old_data, new_data) |
| 154 | + affected_items = Set.new |
| 155 | + |
| 156 | + LaunchDarkly::ALL_KINDS.each do |kind| |
| 157 | + old_items = old_data[kind] || {} |
| 158 | + new_items = new_data[kind] || {} |
| 159 | + |
| 160 | + old_items.keys.concat(new_items.keys).each do |key| |
| 161 | + old_item = old_items[key] |
| 162 | + new_item = new_items[key] |
| 163 | + |
| 164 | + next if old_item.nil? && new_item.nil? |
| 165 | + |
| 166 | + if old_item.nil? || new_item.nil? || old_item[:version] < new_item[:version] |
| 167 | + @dependency_tracker.add_affected_items(affected_items, {kind: kind, key: key.to_s}) |
| 168 | + end |
| 169 | + end |
| 170 | + end |
| 171 | + |
| 172 | + affected_items |
| 173 | + end |
| 174 | + |
| 175 | + # |
| 176 | + # @param affected_items [Set] |
| 177 | + # |
| 178 | + private def send_change_events(affected_items) |
| 179 | + affected_items.each do |item| |
| 180 | + if item[:kind] == LaunchDarkly::FEATURES |
| 181 | + @flag_change_broadcaster.broadcast(LaunchDarkly::Interfaces::FlagChange.new(item[:key])) |
| 182 | + end |
| 183 | + end |
| 184 | + end |
| 185 | + end |
| 186 | + end |
| 187 | + end |
| 188 | +end |
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