CloudWatchEvents

Table of Contents

Client

class CloudWatchEvents.Client

A low-level client representing Amazon CloudWatch Events:

import boto3

client = boto3.client('events')

These are the available methods:

can_paginate(operation_name)

Check if an operation can be paginated.

Parameters
operation_name (string) -- The operation name. This is the same name as the method name on the client. For example, if the method name is create_foo, and you'd normally invoke the operation as client.create_foo(**kwargs), if the create_foo operation can be paginated, you can use the call client.get_paginator("create_foo").
Returns
True if the operation can be paginated, False otherwise.
delete_rule(**kwargs)

Deletes the specified rule.

You must remove all targets from a rule using RemoveTargets before you can delete the rule.

When you delete a rule, incoming events might continue to match to the deleted rule. Please allow a short period of time for changes to take effect.

See also: AWS API Documentation

Request Syntax

response = client.delete_rule(
    Name='string'
)
Parameters
Name (string) --

[REQUIRED]

The name of the rule.

Returns
None
describe_rule(**kwargs)

Describes the specified rule.

See also: AWS API Documentation

Request Syntax

response = client.describe_rule(
    Name='string'
)
Parameters
Name (string) --

[REQUIRED]

The name of the rule.

Return type
dict
Returns
Response Syntax
{
    'Name': 'string',
    'Arn': 'string',
    'EventPattern': 'string',
    'ScheduleExpression': 'string',
    'State': 'ENABLED'|'DISABLED',
    'Description': 'string',
    'RoleArn': 'string'
}

Response Structure

  • (dict) --
    • Name (string) --

      The name of the rule.

    • Arn (string) --

      The Amazon Resource Name (ARN) of the rule.

    • EventPattern (string) --

      The event pattern.

    • ScheduleExpression (string) --

      The scheduling expression. For example, "cron(0 20 * * ? *)", "rate(5 minutes)".

    • State (string) --

      Specifies whether the rule is enabled or disabled.

    • Description (string) --

      The description of the rule.

    • RoleArn (string) --

      The Amazon Resource Name (ARN) of the IAM role associated with the rule.

disable_rule(**kwargs)

Disables the specified rule. A disabled rule won't match any events, and won't self-trigger if it has a schedule expression.

When you disable a rule, incoming events might continue to match to the disabled rule. Please allow a short period of time for changes to take effect.

See also: AWS API Documentation

Request Syntax

response = client.disable_rule(
    Name='string'
)
Parameters
Name (string) --

[REQUIRED]

The name of the rule.

Returns
None
enable_rule(**kwargs)

Enables the specified rule. If the rule does not exist, the operation fails.

When you enable a rule, incoming events might not immediately start matching to a newly enabled rule. Please allow a short period of time for changes to take effect.

See also: AWS API Documentation

Request Syntax

response = client.enable_rule(
    Name='string'
)
Parameters
Name (string) --

[REQUIRED]

The name of the rule.

Returns
None
generate_presigned_url(ClientMethod, Params=None, ExpiresIn=3600, HttpMethod=None)

Generate a presigned url given a client, its method, and arguments

Parameters
  • ClientMethod (string) -- The client method to presign for
  • Params (dict) -- The parameters normally passed to ClientMethod.
  • ExpiresIn (int) -- The number of seconds the presigned url is valid for. By default it expires in an hour (3600 seconds)
  • HttpMethod (string) -- The http method to use on the generated url. By default, the http method is whatever is used in the method's model.
Returns

The presigned url

get_paginator(operation_name)

Create a paginator for an operation.

Parameters
operation_name (string) -- The operation name. This is the same name as the method name on the client. For example, if the method name is create_foo, and you'd normally invoke the operation as client.create_foo(**kwargs), if the create_foo operation can be paginated, you can use the call client.get_paginator("create_foo").
Raises OperationNotPageableError
Raised if the operation is not pageable. You can use the client.can_paginate method to check if an operation is pageable.
Return type
L{botocore.paginate.Paginator}
Returns
A paginator object.
get_waiter(waiter_name)
list_rule_names_by_target(**kwargs)

Lists the rules for the specified target. You can see which of the rules in Amazon CloudWatch Events can invoke a specific target in your account.

See also: AWS API Documentation

Request Syntax

response = client.list_rule_names_by_target(
    TargetArn='string',
    NextToken='string',
    Limit=123
)
Parameters
  • TargetArn (string) --

    [REQUIRED]

    The Amazon Resource Name (ARN) of the target resource.

  • NextToken (string) -- The token returned by a previous call to retrieve the next set of results.
  • Limit (integer) -- The maximum number of results to return.
Return type

dict

Returns

Response Syntax

{
    'RuleNames': [
        'string',
    ],
    'NextToken': 'string'
}

Response Structure

  • (dict) --

    • RuleNames (list) --

      The names of the rules that can invoke the given target.

      • (string) --
    • NextToken (string) --

      Indicates whether there are additional results to retrieve. If there are no more results, the value is null.

list_rules(**kwargs)

Lists your Amazon CloudWatch Events rules. You can either list all the rules or you can provide a prefix to match to the rule names.

See also: AWS API Documentation

Request Syntax

response = client.list_rules(
    NamePrefix='string',
    NextToken='string',
    Limit=123
)
Parameters
  • NamePrefix (string) -- The prefix matching the rule name.
  • NextToken (string) -- The token returned by a previous call to retrieve the next set of results.
  • Limit (integer) -- The maximum number of results to return.
Return type

dict

Returns

Response Syntax

{
    'Rules': [
        {
            'Name': 'string',
            'Arn': 'string',
            'EventPattern': 'string',
            'State': 'ENABLED'|'DISABLED',
            'Description': 'string',
            'ScheduleExpression': 'string',
            'RoleArn': 'string'
        },
    ],
    'NextToken': 'string'
}

Response Structure

  • (dict) --

    • Rules (list) --

      The rules that match the specified criteria.

      • (dict) --

        Contains information about a rule in Amazon CloudWatch Events.

        • Name (string) --

          The name of the rule.

        • Arn (string) --

          The Amazon Resource Name (ARN) of the rule.

        • EventPattern (string) --

          The event pattern of the rule.

        • State (string) --

          The state of the rule.

        • Description (string) --

          The description of the rule.

        • ScheduleExpression (string) --

          The scheduling expression. For example, "cron(0 20 * * ? *)", "rate(5 minutes)".

        • RoleArn (string) --

          The Amazon Resource Name (ARN) of the role that is used for target invocation.

    • NextToken (string) --

      Indicates whether there are additional results to retrieve. If there are no more results, the value is null.

list_targets_by_rule(**kwargs)

Lists the targets assigned to the specified rule.

See also: AWS API Documentation

Request Syntax

response = client.list_targets_by_rule(
    Rule='string',
    NextToken='string',
    Limit=123
)
Parameters
  • Rule (string) --

    [REQUIRED]

    The name of the rule.

  • NextToken (string) -- The token returned by a previous call to retrieve the next set of results.
  • Limit (integer) -- The maximum number of results to return.
Return type

dict

Returns

Response Syntax

{
    'Targets': [
        {
            'Id': 'string',
            'Arn': 'string',
            'RoleArn': 'string',
            'Input': 'string',
            'InputPath': 'string',
            'InputTransformer': {
                'InputPathsMap': {
                    'string': 'string'
                },
                'InputTemplate': 'string'
            },
            'KinesisParameters': {
                'PartitionKeyPath': 'string'
            },
            'RunCommandParameters': {
                'RunCommandTargets': [
                    {
                        'Key': 'string',
                        'Values': [
                            'string',
                        ]
                    },
                ]
            },
            'EcsParameters': {
                'TaskDefinitionArn': 'string',
                'TaskCount': 123
            }
        },
    ],
    'NextToken': 'string'
}

Response Structure

  • (dict) --

    • Targets (list) --

      The targets assigned to the rule.

      • (dict) --

        Targets are the resources to be invoked when a rule is triggered. Target types include EC2 instances, AWS Lambda functions, Amazon Kinesis streams, Amazon ECS tasks, AWS Step Functions state machines, Run Command, and built-in targets.

        • Id (string) --

          The ID of the target.

        • Arn (string) --

          The Amazon Resource Name (ARN) of the target.

        • RoleArn (string) --

          The Amazon Resource Name (ARN) of the IAM role to be used for this target when the rule is triggered. If one rule triggers multiple targets, you can use a different IAM role for each target.

        • Input (string) --

          Valid JSON text passed to the target. In this case, nothing from the event itself is passed to the target. For more information, see The JavaScript Object Notation (JSON) Data Interchange Format .

        • InputPath (string) --

          The value of the JSONPath that is used for extracting part of the matched event when passing it to the target. For more information about JSON paths, see JSONPath .

        • InputTransformer (dict) --

          Settings to enable you to provide custom input to a target based on certain event data. You can extract one or more key-value pairs from the event and then use that data to send customized input to the target.

          • InputPathsMap (dict) --

            Map of JSON paths to be extracted from the event. These are key-value pairs, where each value is a JSON path.

            • (string) --
              • (string) --
          • InputTemplate (string) --

            Input template where you can use the values of the keys from InputPathsMap to customize the data sent to the target.

        • KinesisParameters (dict) --

          The custom parameter you can use to control shard assignment, when the target is an Amazon Kinesis stream. If you do not include this parameter, the default is to use the eventId as the partition key.

          • PartitionKeyPath (string) --

            The JSON path to be extracted from the event and used as the partition key. For more information, see Amazon Kinesis Streams Key Concepts in the Amazon Kinesis Streams Developer Guide .

        • RunCommandParameters (dict) --

          Parameters used when you are using the rule to invoke Amazon EC2 Run Command.

          • RunCommandTargets (list) --

            Currently, we support including only one RunCommandTarget block, which specifies either an array of InstanceIds or a tag.

            • (dict) --

              Information about the EC2 instances that are to be sent the command, specified as key-value pairs. Each RunCommandTarget block can include only one key, but this key may specify multiple values.

              • Key (string) --

                Can be either tag: tag-key or InstanceIds .

              • Values (list) --

                If Key is tag: tag-key , Values is a list of tag values. If Key is InstanceIds , Values is a list of Amazon EC2 instance IDs.

                • (string) --
        • EcsParameters (dict) --

          Contains the Amazon ECS task definition and task count to be used, if the event target is an Amazon ECS task. For more information about Amazon ECS tasks, see Task Definitions in the Amazon EC2 Container Service Developer Guide .

          • TaskDefinitionArn (string) --

            The ARN of the task definition to use if the event target is an Amazon ECS cluster.

          • TaskCount (integer) --

            The number of tasks to create based on the TaskDefinition . The default is one.

    • NextToken (string) --

      Indicates whether there are additional results to retrieve. If there are no more results, the value is null.

put_events(**kwargs)

Sends custom events to Amazon CloudWatch Events so that they can be matched to rules.

See also: AWS API Documentation

Request Syntax

response = client.put_events(
    Entries=[
        {
            'Time': datetime(2015, 1, 1),
            'Source': 'string',
            'Resources': [
                'string',
            ],
            'DetailType': 'string',
            'Detail': 'string'
        },
    ]
)
Parameters
Entries (list) --

[REQUIRED]

The entry that defines an event in your system. You can specify several parameters for the entry such as the source and type of the event, resources associated with the event, and so on.

  • (dict) --

    Represents an event to be submitted.

    • Time (datetime) --

      The timestamp of the event, per RFC3339 . If no timestamp is provided, the timestamp of the PutEvents call is used.

    • Source (string) --

      The source of the event.

    • Resources (list) --

      AWS resources, identified by Amazon Resource Name (ARN), which the event primarily concerns. Any number, including zero, may be present.

      • (string) --
    • DetailType (string) --

      Free-form string used to decide what fields to expect in the event detail.

    • Detail (string) --

      In the JSON sense, an object containing fields, which may also contain nested subobjects. No constraints are imposed on its contents.

Return type
dict
Returns
Response Syntax
{
    'FailedEntryCount': 123,
    'Entries': [
        {
            'EventId': 'string',
            'ErrorCode': 'string',
            'ErrorMessage': 'string'
        },
    ]
}

Response Structure

  • (dict) --
    • FailedEntryCount (integer) --

      The number of failed entries.

    • Entries (list) --

      The successfully and unsuccessfully ingested events results. If the ingestion was successful, the entry has the event ID in it. Otherwise, you can use the error code and error message to identify the problem with the entry.

      • (dict) --

        Represents an event that failed to be submitted.

        • EventId (string) --

          The ID of the event.

        • ErrorCode (string) --

          The error code that indicates why the event submission failed.

        • ErrorMessage (string) --

          The error message that explains why the event submission failed.

put_rule(**kwargs)

Creates or updates the specified rule. Rules are enabled by default, or based on value of the state. You can disable a rule using DisableRule .

When you create or update a rule, incoming events might not immediately start matching to new or updated rules. Please allow a short period of time for changes to take effect.

A rule must contain at least an EventPattern or ScheduleExpression. Rules with EventPatterns are triggered when a matching event is observed. Rules with ScheduleExpressions self-trigger based on the given schedule. A rule can have both an EventPattern and a ScheduleExpression, in which case the rule triggers on matching events as well as on a schedule.

Most services in AWS treat : or / as the same character in Amazon Resource Names (ARNs). However, CloudWatch Events uses an exact match in event patterns and rules. Be sure to use the correct ARN characters when creating event patterns so that they match the ARN syntax in the event you want to match.

See also: AWS API Documentation

Request Syntax

response = client.put_rule(
    Name='string',
    ScheduleExpression='string',
    EventPattern='string',
    State='ENABLED'|'DISABLED',
    Description='string',
    RoleArn='string'
)
Parameters
  • Name (string) --

    [REQUIRED]

    The name of the rule that you are creating or updating.

  • ScheduleExpression (string) -- The scheduling expression. For example, "cron(0 20 * * ? *)", "rate(5 minutes)".
  • EventPattern (string) -- The event pattern.
  • State (string) -- Indicates whether the rule is enabled or disabled.
  • Description (string) -- A description of the rule.
  • RoleArn (string) -- The Amazon Resource Name (ARN) of the IAM role associated with the rule.
Return type

dict

Returns

Response Syntax

{
    'RuleArn': 'string'
}

Response Structure

  • (dict) --

    • RuleArn (string) --

      The Amazon Resource Name (ARN) of the rule.

put_targets(**kwargs)

Adds the specified targets to the specified rule, or updates the targets if they are already associated with the rule.

Targets are the resources that are invoked when a rule is triggered. Example targets include EC2 instances, AWS Lambda functions, Amazon Kinesis streams, Amazon ECS tasks, AWS Step Functions state machines, and built-in targets. Note that creating rules with built-in targets is supported only in the AWS Management Console.

For some target types, PutTargets provides target-specific parameters. If the target is an Amazon Kinesis stream, you can optionally specify which shard the event goes to by using the KinesisParameters argument. To invoke a command on multiple EC2 instances with one rule, you can use the RunCommandParameters field.

To be able to make API calls against the resources that you own, Amazon CloudWatch Events needs the appropriate permissions. For AWS Lambda and Amazon SNS resources, CloudWatch Events relies on resource-based policies. For EC2 instances, Amazon Kinesis streams, and AWS Step Functions state machines, CloudWatch Events relies on IAM roles that you specify in the RoleARN argument in PutTarget . For more information, see Authentication and Access Control in the Amazon CloudWatch Events User Guide .

Input , InputPath and InputTransformer are mutually exclusive and optional parameters of a target. When a rule is triggered due to a matched event:
  • If none of the following arguments are specified for a target, then the entire event is passed to the target in JSON form (unless the target is Amazon EC2 Run Command or Amazon ECS task, in which case nothing from the event is passed to the target).
  • If Input is specified in the form of valid JSON, then the matched event is overridden with this constant.
  • If InputPath is specified in the form of JSONPath (for example, $.detail ), then only the part of the event specified in the path is passed to the target (for example, only the detail part of the event is passed).
  • If InputTransformer is specified, then one or more specified JSONPaths are extracted from the event and used as values in a template that you specify as the input to the target.

When you add targets to a rule and the associated rule triggers soon after, new or updated targets might not be immediately invoked. Please allow a short period of time for changes to take effect.

See also: AWS API Documentation

Request Syntax

response = client.put_targets(
    Rule='string',
    Targets=[
        {
            'Id': 'string',
            'Arn': 'string',
            'RoleArn': 'string',
            'Input': 'string',
            'InputPath': 'string',
            'InputTransformer': {
                'InputPathsMap': {
                    'string': 'string'
                },
                'InputTemplate': 'string'
            },
            'KinesisParameters': {
                'PartitionKeyPath': 'string'
            },
            'RunCommandParameters': {
                'RunCommandTargets': [
                    {
                        'Key': 'string',
                        'Values': [
                            'string',
                        ]
                    },
                ]
            },
            'EcsParameters': {
                'TaskDefinitionArn': 'string',
                'TaskCount': 123
            }
        },
    ]
)
Parameters
  • Rule (string) --

    [REQUIRED]

    The name of the rule.

  • Targets (list) --

    [REQUIRED]

    The targets to update or add to the rule.

    • (dict) --

      Targets are the resources to be invoked when a rule is triggered. Target types include EC2 instances, AWS Lambda functions, Amazon Kinesis streams, Amazon ECS tasks, AWS Step Functions state machines, Run Command, and built-in targets.

      • Id (string) -- [REQUIRED]

        The ID of the target.

      • Arn (string) -- [REQUIRED]

        The Amazon Resource Name (ARN) of the target.

      • RoleArn (string) --

        The Amazon Resource Name (ARN) of the IAM role to be used for this target when the rule is triggered. If one rule triggers multiple targets, you can use a different IAM role for each target.

      • Input (string) --

        Valid JSON text passed to the target. In this case, nothing from the event itself is passed to the target. For more information, see The JavaScript Object Notation (JSON) Data Interchange Format .

      • InputPath (string) --

        The value of the JSONPath that is used for extracting part of the matched event when passing it to the target. For more information about JSON paths, see JSONPath .

      • InputTransformer (dict) --

        Settings to enable you to provide custom input to a target based on certain event data. You can extract one or more key-value pairs from the event and then use that data to send customized input to the target.

        • InputPathsMap (dict) --

          Map of JSON paths to be extracted from the event. These are key-value pairs, where each value is a JSON path.

          • (string) --
            • (string) --
        • InputTemplate (string) -- [REQUIRED]

          Input template where you can use the values of the keys from InputPathsMap to customize the data sent to the target.

      • KinesisParameters (dict) --

        The custom parameter you can use to control shard assignment, when the target is an Amazon Kinesis stream. If you do not include this parameter, the default is to use the eventId as the partition key.

        • PartitionKeyPath (string) -- [REQUIRED]

          The JSON path to be extracted from the event and used as the partition key. For more information, see Amazon Kinesis Streams Key Concepts in the Amazon Kinesis Streams Developer Guide .

      • RunCommandParameters (dict) --

        Parameters used when you are using the rule to invoke Amazon EC2 Run Command.

        • RunCommandTargets (list) -- [REQUIRED]

          Currently, we support including only one RunCommandTarget block, which specifies either an array of InstanceIds or a tag.

          • (dict) --

            Information about the EC2 instances that are to be sent the command, specified as key-value pairs. Each RunCommandTarget block can include only one key, but this key may specify multiple values.

            • Key (string) -- [REQUIRED]

              Can be either tag: tag-key or InstanceIds .

            • Values (list) -- [REQUIRED]

              If Key is tag: tag-key , Values is a list of tag values. If Key is InstanceIds , Values is a list of Amazon EC2 instance IDs.

              • (string) --
      • EcsParameters (dict) --

        Contains the Amazon ECS task definition and task count to be used, if the event target is an Amazon ECS task. For more information about Amazon ECS tasks, see Task Definitions in the Amazon EC2 Container Service Developer Guide .

        • TaskDefinitionArn (string) -- [REQUIRED]

          The ARN of the task definition to use if the event target is an Amazon ECS cluster.

        • TaskCount (integer) --

          The number of tasks to create based on the TaskDefinition . The default is one.

Return type

dict

Returns

Response Syntax

{
    'FailedEntryCount': 123,
    'FailedEntries': [
        {
            'TargetId': 'string',
            'ErrorCode': 'string',
            'ErrorMessage': 'string'
        },
    ]
}

Response Structure

  • (dict) --

    • FailedEntryCount (integer) --

      The number of failed entries.

    • FailedEntries (list) --

      The failed target entries.

      • (dict) --

        Represents a target that failed to be added to a rule.

        • TargetId (string) --

          The ID of the target.

        • ErrorCode (string) --

          The error code that indicates why the target addition failed.

        • ErrorMessage (string) --

          The error message that explains why the target addition failed.

remove_targets(**kwargs)

Removes the specified targets from the specified rule. When the rule is triggered, those targets are no longer be invoked.

When you remove a target, when the associated rule triggers, removed targets might continue to be invoked. Please allow a short period of time for changes to take effect.

See also: AWS API Documentation

Request Syntax

response = client.remove_targets(
    Rule='string',
    Ids=[
        'string',
    ]
)
Parameters
  • Rule (string) --

    [REQUIRED]

    The name of the rule.

  • Ids (list) --

    [REQUIRED]

    The IDs of the targets to remove from the rule.

    • (string) --
Return type

dict

Returns

Response Syntax

{
    'FailedEntryCount': 123,
    'FailedEntries': [
        {
            'TargetId': 'string',
            'ErrorCode': 'string',
            'ErrorMessage': 'string'
        },
    ]
}

Response Structure

  • (dict) --

    • FailedEntryCount (integer) --

      The number of failed entries.

    • FailedEntries (list) --

      The failed target entries.

      • (dict) --

        Represents a target that failed to be removed from a rule.

        • TargetId (string) --

          The ID of the target.

        • ErrorCode (string) --

          The error code that indicates why the target removal failed.

        • ErrorMessage (string) --

          The error message that explains why the target removal failed.

test_event_pattern(**kwargs)

Tests whether the specified event pattern matches the provided event.

Most services in AWS treat : or / as the same character in Amazon Resource Names (ARNs). However, CloudWatch Events uses an exact match in event patterns and rules. Be sure to use the correct ARN characters when creating event patterns so that they match the ARN syntax in the event you want to match.

See also: AWS API Documentation

Request Syntax

response = client.test_event_pattern(
    EventPattern='string',
    Event='string'
)
Parameters
  • EventPattern (string) --

    [REQUIRED]

    The event pattern.

  • Event (string) --

    [REQUIRED]

    The event, in JSON format, to test against the event pattern.

Return type

dict

Returns

Response Syntax

{
    'Result': True|False
}

Response Structure

  • (dict) --

    • Result (boolean) --

      Indicates whether the event matches the event pattern.

Paginators

The available paginators are: