Amazonka.Lambda.Invoke

Invokes a Lambda function. You can invoke a function synchronously (and wait for the response), or asynchronously. To invoke a function asynchronously, set InvocationType to Event.

For synchronous invocation, details about the function response, including errors, are included in the response body and headers. For either invocation type, you can find more information in the execution log and trace.

When an error occurs, your function may be invoked multiple times. Retry behavior varies by error type, client, event source, and invocation type. For example, if you invoke a function asynchronously and it returns an error, Lambda executes the function up to two more times. For more information, see Error handling and automatic retries in Lambda.

For asynchronous invocation, Lambda adds events to a queue before sending them to your function. If your function does not have enough capacity to keep up with the queue, events may be lost. Occasionally, your function may receive the same event multiple times, even if no error occurs. To retain events that were not processed, configure your function with a dead-letter queue.

The status code in the API response doesn't reflect function errors. Error codes are reserved for errors that prevent your function from executing, such as permissions errors, quota errors, or issues with your function's code and configuration. For example, Lambda returns TooManyRequestsException if running the function would cause you to exceed a concurrency limit at either the account level (ConcurrentInvocationLimitExceeded) or function level (ReservedFunctionConcurrentInvocationLimitExceeded).

For functions with a long timeout, your client might disconnect during synchronous invocation while it waits for a response. Configure your HTTP client, SDK, firewall, proxy, or operating system to allow for long connections with timeout or keep-alive settings.

This operation requires permission for the lambda:InvokeFunction action. For details on how to set up permissions for cross-account invocations, see Granting function access to other accounts.

Creating a Request

data Invoke

See: newInvoke smart constructor.

Constructors

Invoke'

Fields

• clientContext :: Maybe Text

  Up to 3,583 bytes of base64-encoded data about the invoking client to pass to the function in the context object.

• invocationType :: Maybe InvocationType

  Choose from the following options.

  • RequestResponse (default) – Invoke the function synchronously. Keep the connection open until the function returns a response or times out. The API response includes the function response and additional data.
  • Event – Invoke the function asynchronously. Send events that fail multiple times to the function's dead-letter queue (if one is configured). The API response only includes a status code.
  • DryRun – Validate parameter values and verify that the user or role has permission to invoke the function.
• logType :: Maybe LogType

  Set to Tail to include the execution log in the response. Applies to synchronously invoked functions only.

• qualifier :: Maybe Text

  Specify a version or alias to invoke a published version of the function.

• functionName :: Text

  The name of the Lambda function, version, or alias.

  Name formats

  • Function name – my-function (name-only), my-function:v1 (with alias).
  • Function ARN – arn:aws:lambda:us-west-2:123456789012:function:my-function.
  • Partial ARN – 123456789012:function:my-function.

  You can append a version number or alias to any of the formats. The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

• payload :: ByteString

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

  You can enter the JSON directly. For example, --payload '{ "key": "value" }'. You can also specify a file path. For example, --payload file://payload.json.

Instances

ToBody Invoke

Defined in Amazonka.Lambda.Invoke

Methods

toBody :: Invoke -> RequestBody

ToHeaders Invoke

Defined in Amazonka.Lambda.Invoke

Methods

toHeaders :: Invoke -> [Header]

ToPath Invoke

Defined in Amazonka.Lambda.Invoke

Methods

toPath :: Invoke -> ByteString

ToQuery Invoke

Defined in Amazonka.Lambda.Invoke

Methods

toQuery :: Invoke -> QueryString

AWSRequest Invoke

Defined in Amazonka.Lambda.Invoke

Associated Types

type AWSResponse Invoke

Methods

request :: (Service -> Service) -> Invoke -> Request Invoke

response :: MonadResource m => (ByteStringLazy -> IO ByteStringLazy) -> Service -> Proxy Invoke -> ClientResponse ClientBody -> m (Either Error (ClientResponse (AWSResponse Invoke)))

Generic Invoke

Defined in Amazonka.Lambda.Invoke

Associated Types

type Rep Invoke :: Type -> Type

Methods

from :: Invoke -> Rep Invoke x

to :: Rep Invoke x -> Invoke

Show Invoke

Defined in Amazonka.Lambda.Invoke

Methods

showsPrec :: Int -> Invoke -> ShowS

show :: Invoke -> String

showList :: [Invoke] -> ShowS

NFData Invoke

Defined in Amazonka.Lambda.Invoke

Methods

rnf :: Invoke -> ()

Eq Invoke

Defined in Amazonka.Lambda.Invoke

Methods

(==) :: Invoke -> Invoke -> Bool

(/=) :: Invoke -> Invoke -> Bool

Hashable Invoke

Defined in Amazonka.Lambda.Invoke

Methods

hashWithSalt :: Int -> Invoke -> Int

hash :: Invoke -> Int

type AWSResponse Invoke

Defined in Amazonka.Lambda.Invoke

type AWSResponse Invoke = InvokeResponse

type Rep Invoke

Defined in Amazonka.Lambda.Invoke

type Rep Invoke = D1 ('MetaData "Invoke" "Amazonka.Lambda.Invoke" "amazonka-lambda-2.0-FcjxCCKaCGK94C2lDO9alC" 'False) (C1 ('MetaCons "Invoke'" 'PrefixI 'True) ((S1 ('MetaSel ('Just "clientContext") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe Text)) :*: (S1 ('MetaSel ('Just "invocationType") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe InvocationType)) :*: S1 ('MetaSel ('Just "logType") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe LogType)))) :*: (S1 ('MetaSel ('Just "qualifier") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe Text)) :*: (S1 ('MetaSel ('Just "functionName") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 Text) :*: S1 ('MetaSel ('Just "payload") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 ByteString)))))

newInvoke

Arguments

:: Text

Invoke

-> ByteString

Invoke

-> Invoke

Create a value of Invoke with all optional fields omitted.

Use generic-lens or optics to modify other optional fields.

The following record fields are available, with the corresponding lenses provided for backwards compatibility:

$sel:clientContext:Invoke', invoke_clientContext - Up to 3,583 bytes of base64-encoded data about the invoking client to pass to the function in the context object.

$sel:invocationType:Invoke', invoke_invocationType - Choose from the following options.

• RequestResponse (default) – Invoke the function synchronously. Keep the connection open until the function returns a response or times out. The API response includes the function response and additional data.
• Event – Invoke the function asynchronously. Send events that fail multiple times to the function's dead-letter queue (if one is configured). The API response only includes a status code.
• DryRun – Validate parameter values and verify that the user or role has permission to invoke the function.

$sel:logType:Invoke', invoke_logType - Set to Tail to include the execution log in the response. Applies to synchronously invoked functions only.

$sel:qualifier:Invoke', invoke_qualifier - Specify a version or alias to invoke a published version of the function.

Invoke, invoke_functionName - The name of the Lambda function, version, or alias.

Name formats

• Function name – my-function (name-only), my-function:v1 (with alias).
• Function ARN – arn:aws:lambda:us-west-2:123456789012:function:my-function.
• Partial ARN – 123456789012:function:my-function.

You can append a version number or alias to any of the formats. The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

Invoke, invoke_payload - The JSON that you want to provide to your Lambda function as input.

You can enter the JSON directly. For example, --payload '{ "key": "value" }'. You can also specify a file path. For example, --payload file://payload.json.

Request Lenses

invoke_clientContext :: Lens' Invoke (Maybe Text)

Up to 3,583 bytes of base64-encoded data about the invoking client to pass to the function in the context object.

invoke_invocationType :: Lens' Invoke (Maybe InvocationType)

Choose from the following options.

• RequestResponse (default) – Invoke the function synchronously. Keep the connection open until the function returns a response or times out. The API response includes the function response and additional data.
• Event – Invoke the function asynchronously. Send events that fail multiple times to the function's dead-letter queue (if one is configured). The API response only includes a status code.
• DryRun – Validate parameter values and verify that the user or role has permission to invoke the function.

invoke_logType :: Lens' Invoke (Maybe LogType)

Set to Tail to include the execution log in the response. Applies to synchronously invoked functions only.

invoke_qualifier :: Lens' Invoke (Maybe Text)

Specify a version or alias to invoke a published version of the function.

invoke_functionName :: Lens' Invoke Text

The name of the Lambda function, version, or alias.

Name formats

• Function name – my-function (name-only), my-function:v1 (with alias).
• Function ARN – arn:aws:lambda:us-west-2:123456789012:function:my-function.
• Partial ARN – 123456789012:function:my-function.

You can append a version number or alias to any of the formats. The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

invoke_payload :: Lens' Invoke ByteString

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

You can enter the JSON directly. For example, --payload '{ "key": "value" }'. You can also specify a file path. For example, --payload file://payload.json.

Destructuring the Response

data InvokeResponse

See: newInvokeResponse smart constructor.

Constructors

InvokeResponse'

Fields

• executedVersion :: Maybe Text

  The version of the function that executed. When you invoke a function with an alias, this indicates which version the alias resolved to.

• functionError :: Maybe Text

  If present, indicates that an error occurred during function execution. Details about the error are included in the response payload.

• logResult :: Maybe Text

  The last 4 KB of the execution log, which is base64-encoded.

• payload :: Maybe ByteString

  The response from the function, or an error object.

• statusCode :: Int

  The HTTP status code is in the 200 range for a successful request. For the RequestResponse invocation type, this status code is 200. For the Event invocation type, this status code is 202. For the DryRun invocation type, the status code is 204.

Instances

Generic InvokeResponse

Defined in Amazonka.Lambda.Invoke

Associated Types

type Rep InvokeResponse :: Type -> Type

Methods

from :: InvokeResponse -> Rep InvokeResponse x

to :: Rep InvokeResponse x -> InvokeResponse

Show InvokeResponse

Defined in Amazonka.Lambda.Invoke

Methods

showsPrec :: Int -> InvokeResponse -> ShowS

show :: InvokeResponse -> String

showList :: [InvokeResponse] -> ShowS

NFData InvokeResponse

Defined in Amazonka.Lambda.Invoke

Methods

rnf :: InvokeResponse -> ()

Eq InvokeResponse

Defined in Amazonka.Lambda.Invoke

Methods

(==) :: InvokeResponse -> InvokeResponse -> Bool

(/=) :: InvokeResponse -> InvokeResponse -> Bool

type Rep InvokeResponse

Defined in Amazonka.Lambda.Invoke

type Rep InvokeResponse = D1 ('MetaData "InvokeResponse" "Amazonka.Lambda.Invoke" "amazonka-lambda-2.0-FcjxCCKaCGK94C2lDO9alC" 'False) (C1 ('MetaCons "InvokeResponse'" 'PrefixI 'True) ((S1 ('MetaSel ('Just "executedVersion") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe Text)) :*: S1 ('MetaSel ('Just "functionError") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe Text))) :*: (S1 ('MetaSel ('Just "logResult") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe Text)) :*: (S1 ('MetaSel ('Just "payload") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 (Maybe ByteString)) :*: S1 ('MetaSel ('Just "statusCode") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedStrict) (Rec0 Int)))))

newInvokeResponse

Arguments

:: Int

$sel:statusCode:InvokeResponse'

-> InvokeResponse

Create a value of InvokeResponse with all optional fields omitted.

Use generic-lens or optics to modify other optional fields.

The following record fields are available, with the corresponding lenses provided for backwards compatibility:

$sel:executedVersion:InvokeResponse', invokeResponse_executedVersion - The version of the function that executed. When you invoke a function with an alias, this indicates which version the alias resolved to.

$sel:functionError:InvokeResponse', invokeResponse_functionError - If present, indicates that an error occurred during function execution. Details about the error are included in the response payload.

$sel:logResult:InvokeResponse', invokeResponse_logResult - The last 4 KB of the execution log, which is base64-encoded.

Invoke, invokeResponse_payload - The response from the function, or an error object.

$sel:statusCode:InvokeResponse', invokeResponse_statusCode - The HTTP status code is in the 200 range for a successful request. For the RequestResponse invocation type, this status code is 200. For the Event invocation type, this status code is 202. For the DryRun invocation type, the status code is 204.

Response Lenses

invokeResponse_executedVersion :: Lens' InvokeResponse (Maybe Text)

The version of the function that executed. When you invoke a function with an alias, this indicates which version the alias resolved to.

invokeResponse_functionError :: Lens' InvokeResponse (Maybe Text)

If present, indicates that an error occurred during function execution. Details about the error are included in the response payload.

invokeResponse_logResult :: Lens' InvokeResponse (Maybe Text)

The last 4 KB of the execution log, which is base64-encoded.

invokeResponse_payload :: Lens' InvokeResponse (Maybe ByteString)

The response from the function, or an error object.

invokeResponse_statusCode :: Lens' InvokeResponse Int

The HTTP status code is in the 200 range for a successful request. For the RequestResponse invocation type, this status code is 200. For the Event invocation type, this status code is 202. For the DryRun invocation type, the status code is 204.