Network.AWS.Lambda.Invoke

Invokes a specific Lambda function.

If you are using the versioning feature, you can invoke the specific function version by providing function version or alias name that is pointing to the function version using the Qualifier parameter in the request. If you don't provide the Qualifier parameter, the '$LATEST' version of the Lambda function is invoked. For information about the versioning feature, see AWS Lambda Function Versioning and Aliases.

This operation requires permission for the 'lambda:InvokeFunction' action.

Creating a Request

invoke

Arguments

:: Text

iFunctionName

-> HashMap Text Value

iPayload

-> Invoke

Creates a value of Invoke with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

• iInvocationType
• iLogType
• iQualifier
• iClientContext
• iFunctionName
• iPayload

data Invoke

See: invoke smart constructor.

Instances

Eq Invoke

Data Invoke

Show Invoke

Generic Invoke

Hashable Invoke

AWSRequest Invoke

ToBody Invoke

ToPath Invoke

ToHeaders Invoke

ToQuery Invoke

type Rep Invoke

type Rs Invoke = InvokeResponse

Request Lenses

iInvocationType :: Lens' Invoke (Maybe InvocationType)

By default, the Invoke API assumes RequestResponse invocation type. You can optionally request asynchronous execution by specifying Event as the InvocationType. You can also use this parameter to request AWS Lambda to not execute the function but do some verification, such as if the caller is authorized to invoke the function and if the inputs are valid. You request this by specifying DryRun as the InvocationType. This is useful in a cross-account scenario when you want to verify access to a function without running it.

iLogType :: Lens' Invoke (Maybe LogType)

You can set this optional parameter to Tail in the request only if you specify the InvocationType parameter with value RequestResponse. In this case, AWS Lambda returns the base64-encoded last 4 KB of log data produced by your Lambda function in the 'x-amz-log-results' header.

iQualifier :: Lens' Invoke (Maybe Text)

You can use this optional parameter to specify a Lambda function version or alias name. If you specify a function version, the API uses the qualified function ARN to invoke a specific Lambda function. If you specify an alias name, the API uses the alias ARN to invoke the Lambda function version to which the alias points.

If you don't provide this parameter, then the API uses unqualified function ARN which results in invocation of the '$LATEST' version.

iClientContext :: Lens' Invoke (Maybe Text)

Using the ClientContext you can pass client-specific information to the Lambda function you are invoking. You can then process the client information in your Lambda function as you choose through the context variable. For an example of a ClientContext JSON, see PutEvents in the Amazon Mobile Analytics API Reference and User Guide.

The ClientContext JSON must be base64-encoded.

iFunctionName :: Lens' Invoke Text

The Lambda function name.

You can specify a function name (for example, Thumbnail) or you can specify Amazon Resource Name (ARN) of the function (for example, 'arn:aws:lambda:us-west-2:account-id:function:ThumbNail'). AWS Lambda also allows you to specify a partial ARN (for example, 'account-id:Thumbnail'). Note that the length constraint applies only to the ARN. If you specify only the function name, it is limited to 64 character in length.

iPayload :: Lens' Invoke (HashMap Text Value)

JSON that you want to provide to your Lambda function as input.

Destructuring the Response

invokeResponse

Arguments

:: Int

irsStatusCode

-> InvokeResponse

Creates a value of InvokeResponse with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

• irsFunctionError
• irsLogResult
• irsPayload
• irsStatusCode

data InvokeResponse

Upon success, returns an empty response. Otherwise, throws an exception.

See: invokeResponse smart constructor.

Instances

Eq InvokeResponse

Data InvokeResponse

Show InvokeResponse

Generic InvokeResponse

type Rep InvokeResponse

Response Lenses

irsFunctionError :: Lens' InvokeResponse (Maybe Text)

Indicates whether an error occurred while executing the Lambda function. If an error occurred this field will have one of two values; Handled or Unhandled. Handled errors are errors that are reported by the function while the Unhandled errors are those detected and reported by AWS Lambda. Unhandled errors include out of memory errors and function timeouts. For information about how to report an Handled error, see Programming Model.

irsLogResult :: Lens' InvokeResponse (Maybe Text)

It is the base64-encoded logs for the Lambda function invocation. This is present only if the invocation type is RequestResponse and the logs were requested.

irsPayload :: Lens' InvokeResponse (Maybe (HashMap Text Value))

It is the JSON representation of the object returned by the Lambda function. In This is present only if the invocation type is RequestResponse.

In the event of a function error this field contains a message describing the error. For the Handled errors the Lambda function will report this message. For Unhandled errors AWS Lambda reports the message.

irsStatusCode :: Lens' InvokeResponse Int

The HTTP status code will be in the 200 range for successful request. For the RequestResonse invocation type this status code will be 200. For the Event invocation type this status code will be 202. For the DryRun invocation type the status code will be 204.