aws_cloudwatch_events

Amazon EventBridge helps you to respond to state changes in your AWS resources. When your resources change state, they automatically send events into an event stream. You can create rules that match selected events in the stream and route them to targets to take action. You can also use rules to take action on a predetermined schedule. For example, you can configure rules to:

• Automatically invoke an AWS Lambda function to update DNS entries when an event notifies you that Amazon EC2 instance enters the running state.

• Direct specific API records from AWS CloudTrail to an Amazon Kinesis data stream for detailed analysis of potential security or availability risks.

• Periodically invoke a built-in target to create a snapshot of an Amazon EBS volume.

Summary

Functions

• activate_event_source(Client, Input)
  Activates a partner event source that has been deactivated.
• activate_event_source(Client, Input, Options)
• create_event_bus(Client, Input)
  Creates a new event bus within your account.
• create_event_bus(Client, Input, Options)
• create_partner_event_source(Client, Input)
  Called by an SaaS partner to create a partner event source.
• create_partner_event_source(Client, Input, Options)
• deactivate_event_source(Client, Input)
  You can use this operation to temporarily stop receiving events from the specified partner event source.
• deactivate_event_source(Client, Input, Options)
• delete_event_bus(Client, Input)
  Deletes the specified custom event bus or partner event bus.
• delete_event_bus(Client, Input, Options)
• delete_partner_event_source(Client, Input)
  This operation is used by SaaS partners to delete a partner event source.
• delete_partner_event_source(Client, Input, Options)
• delete_rule(Client, Input)
  Deletes the specified rule.
• delete_rule(Client, Input, Options)
• describe_event_bus(Client, Input)
  Displays details about an event bus in your account.
• describe_event_bus(Client, Input, Options)
• describe_event_source(Client, Input)
  This operation lists details about a partner event source that is shared with your account.
• describe_event_source(Client, Input, Options)
• describe_partner_event_source(Client, Input)
  An SaaS partner can use this operation to list details about a partner event source that they have created.
• describe_partner_event_source(Client, Input, Options)
• describe_rule(Client, Input)
  Describes the specified rule.
• describe_rule(Client, Input, Options)
• disable_rule(Client, Input)
  Disables the specified rule.
• disable_rule(Client, Input, Options)
• enable_rule(Client, Input)
  Enables the specified rule.
• enable_rule(Client, Input, Options)
• list_event_buses(Client, Input)
  Lists all the event buses in your account, including the default event bus, custom event buses, and partner event buses.
• list_event_buses(Client, Input, Options)
• list_event_sources(Client, Input)
  You can use this to see all the partner event sources that have been shared with your AWS account.
• list_event_sources(Client, Input, Options)
• list_partner_event_source_accounts(Client, Input)
  An SaaS partner can use this operation to display the AWS account ID that a particular partner event source name is associated with.
• list_partner_event_source_accounts(Client, Input, Options)
• list_partner_event_sources(Client, Input)
  An SaaS partner can use this operation to list all the partner event source names that they have created.
• list_partner_event_sources(Client, Input, Options)
• list_rule_names_by_target(Client, Input)
  Lists the rules for the specified target.
• list_rule_names_by_target(Client, Input, Options)
• list_rules(Client, Input)
  Lists your Amazon EventBridge rules.
• list_rules(Client, Input, Options)
• list_tags_for_resource(Client, Input)
  Displays the tags associated with an EventBridge resource.
• list_tags_for_resource(Client, Input, Options)
• list_targets_by_rule(Client, Input)
  Lists the targets assigned to the specified rule.
• list_targets_by_rule(Client, Input, Options)
• put_events(Client, Input)
  Sends custom events to Amazon EventBridge so that they can be matched to rules.
• put_events(Client, Input, Options)
• put_partner_events(Client, Input)
  This is used by SaaS partners to write events to a customer's partner event bus.
• put_partner_events(Client, Input, Options)
• put_permission(Client, Input)
  Running PutPermission permits the specified AWS account or AWS organization to put events to the specified event bus.
• put_permission(Client, Input, Options)
• put_rule(Client, Input)
  Creates or updates the specified rule.
• put_rule(Client, Input, Options)
• put_targets(Client, Input)
  Adds the specified targets to the specified rule, or updates the targets if they are already associated with the rule.
• put_targets(Client, Input, Options)
• remove_permission(Client, Input)
  Revokes the permission of another AWS account to be able to put events to the specified event bus.
• remove_permission(Client, Input, Options)
• remove_targets(Client, Input)
  Removes the specified targets from the specified rule.
• remove_targets(Client, Input, Options)
• tag_resource(Client, Input)
  Assigns one or more tags (key-value pairs) to the specified EventBridge resource.
• tag_resource(Client, Input, Options)
• test_event_pattern(Client, Input)
  Tests whether the specified event pattern matches the provided event.
• test_event_pattern(Client, Input, Options)
• untag_resource(Client, Input)
  Removes one or more tags from the specified EventBridge resource.
• untag_resource(Client, Input, Options)

Functions

Activates a partner event source that has been deactivated. Once activated, your matching event bus will start receiving events from the event source.

Creates a new event bus within your account. This can be a custom event bus which you can use to receive events from your custom applications and services, or it can be a partner event bus which can be matched to a partner event source.

Called by an SaaS partner to create a partner event source. This operation is not used by AWS customers.

Each partner event source can be used by one AWS account to create a matching partner event bus in that AWS account. A SaaS partner must create one partner event source for each AWS account that wants to receive those event types.

A partner event source creates events based on resources within the SaaS partner's service or application.

An AWS account that creates a partner event bus that matches the partner event source can use that event bus to receive events from the partner, and then process them using AWS Events rules and targets.

Partner event source names follow this format:

partner_name/event_namespace/event_name

You can use this operation to temporarily stop receiving events from the specified partner event source. The matching event bus is not deleted.

When you deactivate a partner event source, the source goes into PENDING state. If it remains in PENDING state for more than two weeks, it is deleted.

Deletes the specified custom event bus or partner event bus. All rules associated with this event bus need to be deleted. You can't delete your account's default event bus.

This operation is used by SaaS partners to delete a partner event source. This operation is not used by AWS customers.

When you delete an event source, the status of the corresponding partner event bus in the AWS customer account becomes DELETED.

Deletes the specified rule.

Before you can delete the rule, you must remove all targets, using RemoveTargets.

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

Displays details about an event bus in your account. This can include the external AWS accounts that are permitted to write events to your default event bus, and the associated policy. For custom event buses and partner event buses, it displays the name, ARN, policy, state, and creation time.

To enable your account to receive events from other accounts on its default event bus, use PutPermission.

This operation lists details about a partner event source that is shared with your account.

An SaaS partner can use this operation to list details about a partner event source that they have created. AWS customers do not use this operation. Instead, AWS customers can use DescribeEventSource to see details about a partner event source that is shared with them.

Describes the specified rule.

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

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

Lists all the event buses in your account, including the default event bus, custom event buses, and partner event buses.

You can use this to see all the partner event sources that have been shared with your AWS account. For more information about partner event sources, see CreateEventBus.

An SaaS partner can use this operation to display the AWS account ID that a particular partner event source name is associated with. This operation is not used by AWS customers.

An SaaS partner can use this operation to list all the partner event source names that they have created. This operation is not used by AWS customers.

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

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

Displays the tags associated with an EventBridge resource. In EventBridge, rules and event buses can be tagged.

Lists the targets assigned to the specified rule.

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

This is used by SaaS partners to write events to a customer's partner event bus. AWS customers do not use this operation.

Running PutPermission permits the specified AWS account or AWS organization to put events to the specified event bus. Amazon EventBridge (CloudWatch Events) rules in your account are triggered by these events arriving to an event bus in your account.

For another account to send events to your account, that external account must have an EventBridge rule with your account's event bus as a target.

To enable multiple AWS accounts to put events to your event bus, run PutPermission once for each of these accounts. Or, if all the accounts are members of the same AWS organization, you can run PutPermission once specifying Principal as "*" and specifying the AWS organization ID in Condition, to grant permissions to all accounts in that organization.

If you grant permissions using an organization, then accounts in that organization must specify a RoleArn with proper permissions when they use PutTarget to add your account's event bus as a target. For more information, see Sending and Receiving Events Between AWS Accounts in the Amazon EventBridge User Guide.

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.

A single rule watches for events from a single event bus. Events generated by AWS services go to your account's default event bus. Events generated by SaaS partner services or applications go to the matching partner event bus. If you have custom applications or services, you can specify whether their events go to your default event bus or a custom event bus that you have created. For more information, see CreateEventBus.

If you are updating an existing rule, the rule is replaced with what you specify in this PutRule command. If you omit arguments in PutRule, the old values for those arguments are not kept. Instead, they are replaced with null values.

When you create or update a rule, incoming events might not immediately start matching to new or updated rules. 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.

When you initially create a rule, you can optionally assign one or more tags to the rule. Tags can help you organize and categorize your resources. You can also use them to scope user permissions, by granting a user permission to access or change only rules with certain tag values. To use the PutRule operation and assign tags, you must have both the events:PutRule and events:TagResource permissions.

If you are updating an existing rule, any tags you specify in the PutRule operation are ignored. To update the tags of an existing rule, use TagResource and UntagResource.

Most services in AWS treat : or / as the same character in Amazon Resource Names (ARNs). However, EventBridge 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.

In EventBridge, it is possible to create rules that lead to infinite loops, where a rule is fired repeatedly. For example, a rule might detect that ACLs have changed on an S3 bucket, and trigger software to change them to the desired state. If the rule is not written carefully, the subsequent change to the ACLs fires the rule again, creating an infinite loop.

To prevent this, write the rules so that the triggered actions do not re-fire the same rule. For example, your rule could fire only if ACLs are found to be in a bad state, instead of after any change.

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.

You can configure the following as targets for Events:

• EC2 instances

• SSM Run Command

• SSM Automation

• AWS Lambda functions

• Data streams in Amazon Kinesis Data Streams

• Data delivery streams in Amazon Kinesis Data Firehose

• Amazon ECS tasks

• AWS Step Functions state machines

• AWS Batch jobs

• AWS CodeBuild projects

• Pipelines in AWS CodePipeline

• Amazon Inspector assessment templates

• Amazon SNS topics

• Amazon SQS queues, including FIFO queues

• The default event bus of another AWS account

• Amazon API Gateway REST APIs

Creating rules with built-in targets is supported only in the AWS Management Console. The built-in targets are EC2 CreateSnapshot API call, EC2 RebootInstances API call, EC2 StopInstances API call, and EC2 TerminateInstances API call.

For some target types, PutTargets provides target-specific parameters. If the target is a Kinesis data 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 EventBridge (CloudWatch Events) needs the appropriate permissions. For AWS Lambda and Amazon SNS resources, EventBridge relies on resource-based policies. For EC2 instances, Kinesis data streams, AWS Step Functions state machines and API Gateway REST APIs, EventBridge relies on IAM roles that you specify in the RoleARN argument in PutTargets. For more information, see Authentication and Access Control in the Amazon EventBridge User Guide.

If another AWS account is in the same region and has granted you permission (using PutPermission), you can send events to that account. Set that account's event bus as a target of the rules in your account. To send the matched events to the other account, specify that account's event bus as the Arn value when you run PutTargets. If your account sends events to another account, your account is charged for each sent event. Each event sent to another account is charged as a custom event. The account receiving the event is not charged. For more information, see Amazon EventBridge (CloudWatch Events) Pricing.

Input, InputPath, and InputTransformer are not available with PutTarget if the target is an event bus of a different AWS account. If you are setting the event bus of another account as the target, and that account granted permission to your account through an organization instead of directly by the account ID, then you must specify a RoleArn with proper permissions in the Target structure. For more information, see Sending and Receiving Events Between AWS Accounts in the Amazon EventBridge User Guide.

For more information about enabling cross-account events, see PutPermission.

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 format (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 specify InputPath or InputTransformer, you must use JSON dot notation, not bracket notation.

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

Revokes the permission of another AWS account to be able to put events to the specified event bus. Specify the account to revoke by the StatementId value that you associated with the account when you granted it permission with PutPermission. You can find the StatementId by using DescribeEventBus.

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. Allow a short period of time for changes to take effect.

Assigns one or more tags (key-value pairs) to the specified EventBridge resource. Tags can help you organize and categorize your resources. You can also use them to scope user permissions by granting a user permission to access or change only resources with certain tag values. In EventBridge, rules and event buses can be tagged.

Tags don't have any semantic meaning to AWS and are interpreted strictly as strings of characters.

You can use the TagResource action with a resource that already has tags. If you specify a new tag key, this tag is appended to the list of tags associated with the resource. If you specify a tag key that is already associated with the resource, the new tag value that you specify replaces the previous value for that tag.

Tests whether the specified event pattern matches the provided event.

Removes one or more tags from the specified EventBridge resource. In Amazon EventBridge (CloudWatch Events, rules and event buses can be tagged.