// Code generated by smithy-go-codegen DO NOT EDIT.

package lambda

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Invokes a Lambda function. You can invoke a function synchronously (and wait
// for the response), or asynchronously. By default, Lambda invokes your function
// synchronously (i.e. the InvocationType is RequestResponse ). To invoke a
// function asynchronously, set InvocationType to Event . Lambda passes the
// ClientContext object to your function for synchronous invocations only. For
// synchronous invocation (https://docs.aws.amazon.com/lambda/latest/dg/invocation-sync.html)
// , 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 (https://docs.aws.amazon.com/lambda/latest/dg/monitoring-functions.html)
// and trace (https://docs.aws.amazon.com/lambda/latest/dg/lambda-x-ray.html) .
// 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 (https://docs.aws.amazon.com/lambda/latest/dg/invocation-retries.html)
// . For asynchronous invocation (https://docs.aws.amazon.com/lambda/latest/dg/invocation-async.html)
// , 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 (https://docs.aws.amazon.com/lambda/latest/dg/invocation-async.html#invocation-dlq)
// . 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 (https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-limits.html)
// 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 (https://docs.aws.amazon.com/IAM/latest/UserGuide/list_awslambda.html)
// action. For details on how to set up permissions for cross-account invocations,
// see Granting function access to other accounts (https://docs.aws.amazon.com/lambda/latest/dg/access-control-resource-based.html#permissions-resource-xaccountinvoke)
// .
func (c *Client) Invoke(ctx context.Context, params *InvokeInput, optFns ...func(*Options)) (*InvokeOutput, error) {
	if params == nil {
		params = &InvokeInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "Invoke", params, optFns, c.addOperationInvokeMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*InvokeOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type InvokeInput struct {

	// 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.
	//
	// This member is required.
	FunctionName *string

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

	// 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.
	InvocationType types.InvocationType

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

	// 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 .
	Payload []byte

	// Specify a version or alias to invoke a published version of the function.
	Qualifier *string

	noSmithyDocumentSerde
}

type InvokeOutput struct {

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

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

	// The last 4 KB of the execution log, which is base64-encoded.
	LogResult *string

	// The response from the function, or an error object.
	Payload []byte

	// 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.
	StatusCode int32

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata

	noSmithyDocumentSerde
}

func (c *Client) addOperationInvokeMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsRestjson1_serializeOpInvoke{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestjson1_deserializeOpInvoke{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "Invoke"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddClientRequestIDMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddComputeContentLengthMiddleware(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = v4.AddComputePayloadSHA256Middleware(stack); err != nil {
		return err
	}
	if err = addRetryMiddlewares(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpInvokeValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opInvoke(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}

func newServiceMetadataMiddleware_opInvoke(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		OperationName: "Invoke",
	}
}