DynamoGetItemProps

class aws_cdk.aws_stepfunctions_tasks.DynamoGetItemProps(*, comment=None, credentials=None, heartbeat=None, heartbeat_timeout=None, input_path=None, integration_pattern=None, output_path=None, result_path=None, result_selector=None, state_name=None, task_timeout=None, timeout=None, key, table, consistent_read=None, expression_attribute_names=None, projection_expression=None, return_consumed_capacity=None)

Bases: TaskStateBaseProps

Properties for DynamoGetItem Task.

Parameters:

  • comment (Optional[str]) – An optional description for this state. Default: - No comment

  • credentials (Union[Credentials, Dict[str, Any], None]) – Credentials for an IAM Role that the State Machine assumes for executing the task. This enables cross-account resource invocations. Default: - None (Task is executed using the State Machine’s execution role)

  • heartbeat (Optional[Duration]) – (deprecated) Timeout for the heartbeat. Default: - None

  • heartbeat_timeout (Optional[Timeout]) – Timeout for the heartbeat. [disable-awslint:duration-prop-type] is needed because all props interface in aws-stepfunctions-tasks extend this interface Default: - None

  • input_path (Optional[str]) – JSONPath expression to select part of the state to be the input to this state. May also be the special value JsonPath.DISCARD, which will cause the effective input to be the empty object {}. Default: - The entire task input (JSON path ‘$’)

  • integration_pattern (Optional[IntegrationPattern]) – AWS Step Functions integrates with services directly in the Amazon States Language. You can control these AWS services using service integration patterns. Depending on the AWS Service, the Service Integration Pattern availability will vary. Default: - IntegrationPattern.REQUEST_RESPONSE for most tasks. IntegrationPattern.RUN_JOB for the following exceptions: BatchSubmitJob, EmrAddStep, EmrCreateCluster, EmrTerminationCluster, and EmrContainersStartJobRun.

  • output_path (Optional[str]) – JSONPath expression to select select a portion of the state output to pass to the next state. May also be the special value JsonPath.DISCARD, which will cause the effective output to be the empty object {}. Default: - The entire JSON node determined by the state input, the task result, and resultPath is passed to the next state (JSON path ‘$’)

  • result_path (Optional[str]) – JSONPath expression to indicate where to inject the state’s output. May also be the special value JsonPath.DISCARD, which will cause the state’s input to become its output. Default: - Replaces the entire input with the result (JSON path ‘$’)

  • result_selector (Optional[Mapping[str, Any]]) – The JSON that will replace the state’s raw result and become the effective result before ResultPath is applied. You can use ResultSelector to create a payload with values that are static or selected from the state’s raw result. Default: - None

  • state_name (Optional[str]) – Optional name for this state. Default: - The construct ID will be used as state name

  • task_timeout (Optional[Timeout]) – Timeout for the task. [disable-awslint:duration-prop-type] is needed because all props interface in aws-stepfunctions-tasks extend this interface Default: - None

  • timeout (Optional[Duration]) – (deprecated) Timeout for the task. Default: - None

  • key (Mapping[str, DynamoAttributeValue]) – Primary key of the item to retrieve. For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.

  • table (ITable) – The name of the table containing the requested item.

  • consistent_read (Optional[bool]) – Determines the read consistency model: If set to true, then the operation uses strongly consistent reads; otherwise, the operation uses eventually consistent reads. Default: false

  • expression_attribute_names (Optional[Mapping[str, str]]) – One or more substitution tokens for attribute names in an expression. Default: - No expression attributes

  • projection_expression (Optional[Sequence[DynamoProjectionExpression]]) – An array of DynamoProjectionExpression that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. Default: - No projection expression

  • return_consumed_capacity (Optional[DynamoConsumedCapacity]) – Determines the level of detail about provisioned throughput consumption that is returned in the response. Default: DynamoConsumedCapacity.NONE

ExampleMetadata:

infused

Example:

# my_table: dynamodb.Table

tasks.DynamoGetItem(self, "Get Item",
    key={"message_id": tasks.DynamoAttributeValue.from_string("message-007")},
    table=my_table
)

Attributes

comment

An optional description for this state.

Default:

  • No comment

consistent_read

If set to true, then the operation uses strongly consistent reads;

otherwise, the operation uses eventually consistent reads.

Default:

false

Type:

Determines the read consistency model

credentials

Credentials for an IAM Role that the State Machine assumes for executing the task.

This enables cross-account resource invocations.

Default:

  • None (Task is executed using the State Machine’s execution role)

See:

https://docs.aws.amazon.com/step-functions/latest/dg/concepts-access-cross-acct-resources.html

expression_attribute_names

One or more substitution tokens for attribute names in an expression.

Default:

  • No expression attributes

See:

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html#DDB-GetItem-request-ExpressionAttributeNames

heartbeat

(deprecated) Timeout for the heartbeat.

Default:

  • None

Deprecated:

use heartbeatTimeout

Stability:

deprecated

heartbeat_timeout

Timeout for the heartbeat.

[disable-awslint:duration-prop-type] is needed because all props interface in aws-stepfunctions-tasks extend this interface

Default:

  • None

input_path

JSONPath expression to select part of the state to be the input to this state.

May also be the special value JsonPath.DISCARD, which will cause the effective input to be the empty object {}.

Default:

  • The entire task input (JSON path ‘$’)

integration_pattern

AWS Step Functions integrates with services directly in the Amazon States Language.

You can control these AWS services using service integration patterns.

Depending on the AWS Service, the Service Integration Pattern availability will vary.

Default:

  • IntegrationPattern.REQUEST_RESPONSE for most tasks.

IntegrationPattern.RUN_JOB for the following exceptions: BatchSubmitJob, EmrAddStep, EmrCreateCluster, EmrTerminationCluster, and EmrContainersStartJobRun.

See:

https://docs.aws.amazon.com/step-functions/latest/dg/connect-supported-services.html

key

Primary key of the item to retrieve.

For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.

See:

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html#DDB-GetItem-request-Key

output_path

JSONPath expression to select select a portion of the state output to pass to the next state.

May also be the special value JsonPath.DISCARD, which will cause the effective output to be the empty object {}.

Default:

  • The entire JSON node determined by the state input, the task result,

and resultPath is passed to the next state (JSON path ‘$’)

projection_expression

An array of DynamoProjectionExpression that identifies one or more attributes to retrieve from the table.

These attributes can include scalars, sets, or elements of a JSON document.

Default:

  • No projection expression

See:

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html#DDB-GetItem-request-ProjectionExpression

result_path

JSONPath expression to indicate where to inject the state’s output.

May also be the special value JsonPath.DISCARD, which will cause the state’s input to become its output.

Default:

  • Replaces the entire input with the result (JSON path ‘$’)

result_selector

The JSON that will replace the state’s raw result and become the effective result before ResultPath is applied.

You can use ResultSelector to create a payload with values that are static or selected from the state’s raw result.

Default:

  • None

See:

https://docs.aws.amazon.com/step-functions/latest/dg/input-output-inputpath-params.html#input-output-resultselector

return_consumed_capacity

Determines the level of detail about provisioned throughput consumption that is returned in the response.

Default:

DynamoConsumedCapacity.NONE

See:

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html#DDB-GetItem-request-ReturnConsumedCapacity

state_name

Optional name for this state.

Default:

  • The construct ID will be used as state name

table

The name of the table containing the requested item.

task_timeout

Timeout for the task.

[disable-awslint:duration-prop-type] is needed because all props interface in aws-stepfunctions-tasks extend this interface

Default:

  • None

timeout

(deprecated) Timeout for the task.

Default:

  • None

Deprecated:

use taskTimeout

Stability:

deprecated