Class: Dynamoid::AdapterPlugin::AwsSdkV2
- Inherits:
-
Object
- Object
- Dynamoid::AdapterPlugin::AwsSdkV2
- Defined in:
- lib/dynamoid/adapter_plugin/aws_sdk_v2.rb
Overview
The AwsSdkV2 adapter provides support for the aws-sdk version 2 for ruby.
Defined Under Namespace
Classes: ItemUpdater, Table
Constant Summary collapse
- EQ =
'EQ'.freeze
- RANGE_MAP =
{ range_greater_than: 'GT', range_less_than: 'LT', range_gte: 'GE', range_lte: 'LE', range_begins_with: 'BEGINS_WITH', range_between: 'BETWEEN', range_eq: 'EQ' }
- FIELD_MAP =
Don’t implement NULL and NOT_NULL because it doesn’t make seanse - we declare schema in models
{ eq: 'EQ', gt: 'GT', lt: 'LT', gte: 'GE', lte: 'LE', begins_with: 'BEGINS_WITH', between: 'BETWEEN', in: 'IN', contains: 'CONTAINS', not_contains: 'NOT_CONTAINS' }
- HASH_KEY =
'HASH'.freeze
- RANGE_KEY =
'RANGE'.freeze
- STRING_TYPE =
'S'.freeze
- NUM_TYPE =
'N'.freeze
- BINARY_TYPE =
'B'.freeze
- TABLE_STATUSES =
{ creating: 'CREATING', updating: 'UPDATING', deleting: 'DELETING', active: 'ACTIVE' }.freeze
- PARSE_TABLE_STATUS =
->(resp, lookup = :table) { # lookup is table for describe_table API # lookup is table_description for create_table API # because Amazon, damnit. resp.send(lookup).table_status }
- BATCH_WRITE_ITEM_REQUESTS_LIMIT =
25
Instance Attribute Summary collapse
-
#table_cache ⇒ Object
readonly
Returns the value of attribute table_cache.
Instance Method Summary collapse
-
#batch_delete_item(options) ⇒ Object
Delete many items at once from DynamoDB.
-
#batch_get_item(table_ids, options = {}) ⇒ Hash
Get many items at once from DynamoDB.
-
#batch_write_item(table_name, objects, options = {}) ⇒ Object
Puts or deletes multiple items in one or more tables.
-
#client ⇒ Object
Return the client object.
-
#connect! ⇒ Aws::DynamoDB::Client
Establish the connection to DynamoDB.
- #connection_config ⇒ Object
- #count(table_name) ⇒ Object
-
#create_table(table_name, key = :id, options = {}) ⇒ Object
Create a table on DynamoDB.
-
#create_table_synchronously(table_name, key = :id, options = {}) ⇒ Object
Create a table on DynamoDB synchronously.
-
#delete_item(table_name, key, options = {}) ⇒ Object
Removes an item from DynamoDB.
-
#delete_table(table_name, options = {}) ⇒ Object
Deletes an entire table from DynamoDB.
- #delete_table_synchronously(table_name, options = {}) ⇒ Object
-
#get_item(table_name, key, options = {}) ⇒ Hash
Fetches an item from DynamoDB.
-
#list_tables ⇒ Object
List all tables on DynamoDB.
-
#put_item(table_name, object, options = {}) ⇒ Object
Persists an item on DynamoDB.
-
#query(table_name, opts = {}) ⇒ Enumerable
Query the DynamoDB table.
-
#scan(table_name, scan_hash = {}, select_opts = {}) ⇒ Enumerable
Scan the DynamoDB table.
-
#truncate(table_name) ⇒ Object
Truncates all records in the given table.
-
#update_item(table_name, key, options = {}) {|iu = ItemUpdater.new(table, key, range_key)| ... } ⇒ Object
Edits an existing item’s attributes, or adds a new item to the table if it does not already exist.
Instance Attribute Details
#table_cache ⇒ Object (readonly)
Returns the value of attribute table_cache.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 50 def table_cache @table_cache end |
Instance Method Details
#batch_delete_item(options) ⇒ Object
Delete many items at once from DynamoDB. More efficient than delete each item individually.
or
Dynamoid::AdapterPlugin::AwsSdkV2.batch_delete_item('table1' => [['hk1', 'rk2'], ['hk1', 'rk2']]]))
See:
-
docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
-
docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#batch_write_item-instance_method
TODO handle rejections because of internal processing failures
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 191 def batch_delete_item() requests = [] .each_pair do |table_name, ids| table = describe_table(table_name) ids.each_slice(BATCH_WRITE_ITEM_REQUESTS_LIMIT) do |sliced_ids| delete_requests = sliced_ids.map { |id| {delete_request: {key: key_stanza(table, *id)}} } requests << {table_name => delete_requests} end end begin requests.map do |request_items| client.batch_write_item( request_items: request_items, return_consumed_capacity: 'TOTAL', return_item_collection_metrics: 'SIZE') end rescue Aws::DynamoDB::Errors::ConditionalCheckFailedException => e raise Dynamoid::Errors::ConditionalCheckFailedException, e end end |
#batch_get_item(table_ids, options = {}) ⇒ Hash
Get many items at once from DynamoDB. More efficient than getting each item individually.
@todo: Provide support for passing options to underlying batch_get_item docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#batch_get_item-instance_method
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 135 def batch_get_item(table_ids, = {}) request_items = Hash.new{|h, k| h[k] = []} return request_items if table_ids.all?{|k, v| v.blank?} ret = Hash.new([].freeze) # Default for tables where no rows are returned table_ids.each do |t, ids| next if ids.blank? tbl = describe_table(t) hk = tbl.hash_key.to_s rng = tbl.range_key.to_s Array(ids).each_slice(Dynamoid::Config.batch_size) do |ids| request_items = Hash.new{|h, k| h[k] = []} keys = if rng.present? Array(ids).map do |h, r| { hk => h, rng => r } end else Array(ids).map do |id| { hk => id } end end request_items[t] = { keys: keys } results = client.batch_get_item( request_items: request_items ) results.data[:responses].each do |table, rows| ret[table] += rows.collect { |r| result_item_to_hash(r) } end end end ret end |
#batch_write_item(table_name, objects, options = {}) ⇒ Object
Puts or deletes multiple items in one or more tables
See:
-
docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
-
docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#batch_write_item-instance_method
TODO handle rejections because of exceeding limit for the whole request - 16 MB, item size limit - 400 KB or because provisioned throughput is exceeded
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 98 def batch_write_item table_name, objects, = {} requests = [] objects.each_slice(BATCH_WRITE_ITEM_REQUESTS_LIMIT) do |os| requests << os.map { |o| { put_request: { item: o } } } end begin requests.each do |request_items| client.batch_write_item( { request_items: { table_name => request_items, }, return_consumed_capacity: 'TOTAL', return_item_collection_metrics: 'SIZE' }.merge!() ) end rescue Aws::DynamoDB::Errors::ConditionalCheckFailedException => e raise Dynamoid::Errors::ConditionalCheckFailedException, e end end |
#client ⇒ Object
Return the client object.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 82 def client @client end |
#connect! ⇒ Aws::DynamoDB::Client
Establish the connection to DynamoDB.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 55 def connect! @client = Aws::DynamoDB::Client.new(connection_config) @table_cache = {} end |
#connection_config ⇒ Object
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 60 def connection_config @connection_hash = {} if Dynamoid::Config.endpoint? @connection_hash[:endpoint] = Dynamoid::Config.endpoint end if Dynamoid::Config.access_key? @connection_hash[:access_key_id] = Dynamoid::Config.access_key end if Dynamoid::Config.secret_key? @connection_hash[:secret_access_key] = Dynamoid::Config.secret_key end if Dynamoid::Config.region? @connection_hash[:region] = Dynamoid::Config.region end @connection_hash end |
#count(table_name) ⇒ Object
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 672 def count(table_name) describe_table(table_name, true).item_count end |
#create_table(table_name, key = :id, options = {}) ⇒ Object
Create a table on DynamoDB. This usually takes a long time to complete.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 228 def create_table(table_name, key = :id, = {}) Dynamoid.logger.info "Creating #{table_name} table. This could take a while." read_capacity = [:read_capacity] || Dynamoid::Config.read_capacity write_capacity = [:write_capacity] || Dynamoid::Config.write_capacity secondary_indexes = .slice( :local_secondary_indexes, :global_secondary_indexes ) ls_indexes = [:local_secondary_indexes] gs_indexes = [:global_secondary_indexes] key_schema = { hash_key_schema: { key => ([:hash_key_type] || :string) }, range_key_schema: [:range_key] } attribute_definitions = build_all_attribute_definitions( key_schema, secondary_indexes ) key_schema = aws_key_schema( key_schema[:hash_key_schema], key_schema[:range_key_schema] ) client_opts = { table_name: table_name, provisioned_throughput: { read_capacity_units: read_capacity, write_capacity_units: write_capacity }, key_schema: key_schema, attribute_definitions: attribute_definitions } if ls_indexes.present? client_opts[:local_secondary_indexes] = ls_indexes.map do |index| index_to_aws_hash(index) end end if gs_indexes.present? client_opts[:global_secondary_indexes] = gs_indexes.map do |index| index_to_aws_hash(index) end end resp = client.create_table(client_opts) [:sync] = true if !.has_key?(:sync) && ls_indexes.present? || gs_indexes.present? until_past_table_status(table_name, :creating) if [:sync] && (status = PARSE_TABLE_STATUS.call(resp, :table_description)) && status == TABLE_STATUSES[:creating] # Response to original create_table, which, if options[:sync] # may have an outdated table_description.table_status of "CREATING" resp rescue Aws::DynamoDB::Errors::ResourceInUseException => e Dynamoid.logger.error "Table #{table_name} cannot be created as it already exists" end |
#create_table_synchronously(table_name, key = :id, options = {}) ⇒ Object
Create a table on DynamoDB synchronously. This usually takes a long time to complete. CreateTable is normally an asynchronous operation. You can optionally define secondary indexes on the new table,
as part of the CreateTable operation.
If you want to create multiple tables with secondary indexes on them,
you must create the tables sequentially.
Only one table with secondary indexes can be
in the CREATING state at any given time.
See: docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#create_table-instance_method
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 304 def create_table_synchronously(table_name, key = :id, = {}) create_table(table_name, key, .merge(sync: true)) end |
#delete_item(table_name, key, options = {}) ⇒ Object
Removes an item from DynamoDB.
@todo: Provide support for various options docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#delete_item-instance_method
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 317 def delete_item(table_name, key, = {}) ||= {} range_key = [:range_key] conditions = [:conditions] table = describe_table(table_name) client.delete_item( table_name: table_name, key: key_stanza(table, key, range_key), expected: expected_stanza(conditions) ) rescue Aws::DynamoDB::Errors::ConditionalCheckFailedException => e raise Dynamoid::Errors::ConditionalCheckFailedException, e end |
#delete_table(table_name, options = {}) ⇒ Object
Deletes an entire table from DynamoDB.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 337 def delete_table(table_name, = {}) resp = client.delete_table(table_name: table_name) until_past_table_status(table_name, :deleting) if [:sync] && (status = PARSE_TABLE_STATUS.call(resp, :table_description)) && status == TABLE_STATUSES[:deleting] table_cache.delete(table_name) rescue Aws::DynamoDB::Errors::ResourceInUseException => e Dynamoid.logger.error "Table #{table_name} cannot be deleted as it is in use" raise e end |
#delete_table_synchronously(table_name, options = {}) ⇒ Object
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 348 def delete_table_synchronously(table_name, = {}) delete_table(table_name, .merge(sync: true)) end |
#get_item(table_name, key, options = {}) ⇒ Hash
Provide support for various options docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#get_item-instance_method
Fetches an item from DynamoDB.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 365 def get_item(table_name, key, = {}) ||= {} table = describe_table(table_name) range_key = .delete(:range_key) item = client.get_item(table_name: table_name, key: key_stanza(table, key, range_key) )[:item] item ? result_item_to_hash(item) : nil end |
#list_tables ⇒ Object
Provide limit support docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#update_item-instance_method
List all tables on DynamoDB.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 411 def list_tables client.list_tables[:table_names] end |
#put_item(table_name, object, options = {}) ⇒ Object
Persists an item on DynamoDB.
See: docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#put_item-instance_method
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 423 def put_item(table_name, object, = {}) item = {} ||= {} object.each do |k, v| next if v.nil? || ((v.is_a?(Set) || v.is_a?(String)) && v.empty?) item[k.to_s] = v end begin client.put_item( { table_name: table_name, item: item, expected: expected_stanza() }.merge!() ) rescue Aws::DynamoDB::Errors::ConditionalCheckFailedException => e raise Dynamoid::Errors::ConditionalCheckFailedException, e end end |
#query(table_name, opts = {}) ⇒ Enumerable
Provide support for various other options docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#query-instance_method
Query the DynamoDB table. This employs DynamoDB’s indexes so is generally faster than scanning, but is only really useful for range queries, since it can only find by one hash key at once. Only provide one range key to the hash.
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 463 def query(table_name, opts = {}) table = describe_table(table_name) hk = (opts[:hash_key].present? ? opts.delete(:hash_key) : table.hash_key).to_s rng = (opts[:range_key].present? ? opts.delete(:range_key) : table.range_key).to_s q = opts.slice( :consistent_read, :scan_index_forward, :select, :index_name ) opts.delete(:consistent_read) opts.delete(:scan_index_forward) opts.delete(:select) opts.delete(:index_name) # Deal with various limits and batching record_limit = opts.delete(:record_limit) scan_limit = opts.delete(:scan_limit) batch_size = opts.delete(:batch_size) limit = [record_limit, scan_limit, batch_size].compact.min q[:limit] = limit if limit opts.delete(:next_token).tap do |token| break unless token q[:exclusive_start_key] = { hk => token[:hash_key_element], rng => token[:range_key_element] } # For secondary indices the start key must contain the indices composite key # but also the table's composite keys q[:exclusive_start_key][table.hash_key] = token[:table_hash_key_element] if token[:table_hash_key_element] q[:exclusive_start_key][table.range_key] = token[:table_range_key_element] if token[:table_range_key_element] end key_conditions = { hk => { # TODO: Provide option for other operators like NE, IN, LE, etc comparison_operator: EQ, attribute_value_list: [ opts.delete(:hash_value).freeze ] } } opts.each_pair do |k, v| # TODO: ATM, only few comparison operators are supported, provide support for all operators next unless(op = RANGE_MAP[k]) key_conditions[rng] = { comparison_operator: op, attribute_value_list: [ opts.delete(k).freeze ].flatten # Flatten as BETWEEN operator specifies array of two elements } end query_filter = {} opts.reject {|k, _| k.in? RANGE_MAP.keys}.each do |attr, hash| query_filter[attr] = { comparison_operator: FIELD_MAP[hash.keys[0]], attribute_value_list: [ hash.values[0].freeze ].flatten # Flatten as BETWEEN operator specifies array of two elements } end q[:table_name] = table_name q[:key_conditions] = key_conditions q[:query_filter] = query_filter Enumerator.new { |y| record_count = 0 scan_count = 0 loop do # Adjust the limit down if the remaining record and/or scan limit are # lower to obey limits. We can assume the difference won't be # negative due to break statements below but choose smaller limit # which is why we have 2 separate if statements. # NOTE: Adjusting based on record_limit can cause many HTTP requests # being made. We may want to change this behavior, but it affects # filtering on data with potentially large gaps. # Example: # User.where('created_at.gte' => 1.day.ago).record_limit(1000) # Records 1-999 User's that fit criteria # Records 1000-2000 Users's that do not fit criteria # Record 2001 fits criteria # The underlying implementation will have 1 page for records 1-999 # then will request with limit 1 for records 1000-2000 (making 1000 # requests of limit 1) until hit record 2001. if q[:limit] && record_limit && record_limit - record_count < q[:limit] q[:limit] = record_limit - record_count end if q[:limit] && scan_limit && scan_limit - scan_count < q[:limit] q[:limit] = scan_limit - scan_count end results = client.query(q) results.items.each { |row| y << result_item_to_hash(row) } record_count += results.items.size break if record_limit && record_count >= record_limit scan_count += results.scanned_count break if scan_limit && scan_count >= scan_limit if(lk = results.last_evaluated_key) q[:exclusive_start_key] = lk else break end end } end |
#scan(table_name, scan_hash = {}, select_opts = {}) ⇒ Enumerable
Scan the DynamoDB table. This is usually a very slow operation as it naively filters all data on the DynamoDB servers.
@todo: Provide support for various options docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#scan-instance_method
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 588 def scan(table_name, scan_hash = {}, select_opts = {}) request = { table_name: table_name } request[:consistent_read] = true if select_opts.delete(:consistent_read) # Deal with various limits and batching record_limit = select_opts.delete(:record_limit) scan_limit = select_opts.delete(:scan_limit) batch_size = select_opts.delete(:batch_size) request_limit = [record_limit, scan_limit, batch_size].compact.min request[:limit] = request_limit if request_limit if scan_hash.present? request[:scan_filter] = scan_hash.reduce({}) do |memo, (attr, cond)| # Flatten as BETWEEN operator specifies array of two elements memo.merge(attr.to_s => { comparison_operator: FIELD_MAP[cond.keys[0]], attribute_value_list: [cond.values[0].freeze].flatten }) end end Enumerator.new do |y| record_count = 0 scan_count = 0 loop do # Adjust the limit down if the remaining record and/or scan limit are # lower to obey limits. We can assume the difference won't be # negative due to break statements below but choose smaller limit # which is why we have 2 separate if statements. # NOTE: Adjusting based on record_limit can cause many HTTP requests # being made. We may want to change this behavior, but it affects # filtering on data with potentially large gaps. # Example: # User.where('created_at.gte' => 1.day.ago).record_limit(1000) # Records 1-999 User's that fit criteria # Records 1000-2000 Users's that do not fit criteria # Record 2001 fits criteria # The underlying implementation will have 1 page for records 1-999 # then will request with limit 1 for records 1000-2000 (making 1000 # requests of limit 1) until hit record 2001. if request[:limit] && record_limit && record_limit - record_count < request[:limit] request[:limit] = record_limit - record_count end if request[:limit] && scan_limit && scan_limit - scan_count < request[:limit] request[:limit] = scan_limit - scan_count end results = client.scan(request) results.items.each { |row| y << result_item_to_hash(row) } record_count += results.items.size break if record_limit && record_count >= record_limit scan_count += results.scanned_count break if scan_limit && scan_count >= scan_limit # Keep pulling if we haven't finished paging in all data if(lk = results[:last_evaluated_key]) request[:exclusive_start_key] = lk else break end end end end |
#truncate(table_name) ⇒ Object
Truncates all records in the given table
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 660 def truncate(table_name) table = describe_table(table_name) hk = table.hash_key rk = table.range_key scan(table_name, {}, {}).each do |attributes| opts = {} opts[:range_key] = attributes[rk.to_sym] if rk delete_item(table_name, attributes[hk], opts) end end |
#update_item(table_name, key, options = {}) {|iu = ItemUpdater.new(table, key, range_key)| ... } ⇒ Object
Provide support for various options docs.aws.amazon.com/sdkforruby/api/Aws/DynamoDB/Client.html#update_item-instance_method
Edits an existing item’s attributes, or adds a new item to the table if it does not already exist. You can put, delete, or add attribute values
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# File 'lib/dynamoid/adapter_plugin/aws_sdk_v2.rb', line 385 def update_item(table_name, key, = {}) range_key = .delete(:range_key) conditions = .delete(:conditions) table = describe_table(table_name) yield(iu = ItemUpdater.new(table, key, range_key)) raise "non-empty options: #{}" unless .empty? begin result = client.update_item(table_name: table_name, key: key_stanza(table, key, range_key), attribute_updates: iu.to_h, expected: expected_stanza(conditions), return_values: 'ALL_NEW' ) result_item_to_hash(result[:attributes]) rescue Aws::DynamoDB::Errors::ConditionalCheckFailedException => e raise Dynamoid::Errors::ConditionalCheckFailedException, e end end |