This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::EventSchemas::Discoverer
<a name="aws-resource-eventschemas-discoverer"></a>

Use the `AWS::EventSchemas::Discoverer` resource to specify a *discoverer* that is associated with an event bus. A discoverer allows the Amazon EventBridge Schema Registry to automatically generate schemas based on events on an event bus. 

## Syntax
<a name="aws-resource-eventschemas-discoverer-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-resource-eventschemas-discoverer-syntax.json"></a>

```
{
  "Type" : "AWS::EventSchemas::Discoverer",
  "Properties" : {
      "[CrossAccount](#cfn-eventschemas-discoverer-crossaccount)" : {{Boolean}},
      "[Description](#cfn-eventschemas-discoverer-description)" : {{String}},
      "[SourceArn](#cfn-eventschemas-discoverer-sourcearn)" : {{String}},
      "[Tags](#cfn-eventschemas-discoverer-tags)" : {{[ TagsEntry, ... ]}}
    }
}
```

### YAML
<a name="aws-resource-eventschemas-discoverer-syntax.yaml"></a>

```
Type: AWS::EventSchemas::Discoverer
Properties:
  [CrossAccount](#cfn-eventschemas-discoverer-crossaccount): {{Boolean}}
  [Description](#cfn-eventschemas-discoverer-description): {{String}}
  [SourceArn](#cfn-eventschemas-discoverer-sourcearn): {{String}}
  [Tags](#cfn-eventschemas-discoverer-tags): {{
    - TagsEntry}}
```

## Properties
<a name="aws-resource-eventschemas-discoverer-properties"></a>

`CrossAccount`  <a name="cfn-eventschemas-discoverer-crossaccount"></a>
Allows for the discovery of the event schemas that are sent to the event bus from another account.  
*Required*: No  
*Type*: Boolean  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Description`  <a name="cfn-eventschemas-discoverer-description"></a>
A description for the discoverer.  
*Required*: No  
*Type*: String  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`SourceArn`  <a name="cfn-eventschemas-discoverer-sourcearn"></a>
The ARN of the event bus.  
*Required*: Yes  
*Type*: String  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`Tags`  <a name="cfn-eventschemas-discoverer-tags"></a>
Tags associated with the resource.  
*Required*: No  
*Type*: Array of [TagsEntry](aws-properties-eventschemas-discoverer-tagsentry.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

## Return values
<a name="aws-resource-eventschemas-discoverer-return-values"></a>

### Ref
<a name="aws-resource-eventschemas-discoverer-return-values-ref"></a>

When you provide the logical ID of this resource to the `Ref` intrinsic function, `Ref` returns the ARN of the discoverer.

For more information about using the `Ref` function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-ref.html).

### Fn::GetAtt
<a name="aws-resource-eventschemas-discoverer-return-values-fn--getatt"></a>

The `Fn::GetAtt` intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the `Fn::GetAtt` intrinsic function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html).

#### 
<a name="aws-resource-eventschemas-discoverer-return-values-fn--getatt-fn--getatt"></a>

`DiscovererArn`  <a name="DiscovererArn-fn::getatt"></a>
The ARN of the discoverer.

`DiscovererId`  <a name="DiscovererId-fn::getatt"></a>
The ID of the discoverer.

`State`  <a name="State-fn::getatt"></a>
The state of the discoverer.

## Examples
<a name="aws-resource-eventschemas-discoverer--examples"></a>

### Generate Schemas for Events on the Default Event Bus
<a name="aws-resource-eventschemas-discoverer--examples--Generate_Schemas_for_Events_on_the_Default_Event_Bus"></a>

#### YAML
<a name="aws-resource-eventschemas-discoverer--examples--Generate_Schemas_for_Events_on_the_Default_Event_Bus--yaml"></a>

```
Resources:
  MyDiscoverer:
    Type: AWS::EventSchemas::Discoverer
    Properties:
      SourceArn: 'arn:aws:events:us-west-2:012345678910:event-bus/default'
      Description: 'discover all custom schemas'
```