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// Code generated by smithy-go-codegen DO NOT EDIT.
package iotdataplane
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/smithy-go/middleware"
smithyhttp "github.com/aws/smithy-go/transport/http"
)
// Gets the details of a single retained message for the specified topic. This
// action returns the message payload of the retained message, which can incur
// messaging costs. To list only the topic names of the retained messages, call
// ListRetainedMessages (https://docs.aws.amazon.com/iot/latest/apireference/API_iotdata_ListRetainedMessages.html)
// . Requires permission to access the GetRetainedMessage (https://docs.aws.amazon.com/service-authorization/latest/reference/list_awsiotfleethubfordevicemanagement.html#awsiotfleethubfordevicemanagement-actions-as-permissions)
// action. For more information about messaging costs, see Amazon Web Services IoT
// Core pricing - Messaging (http://aws.amazon.com/iot-core/pricing/#Messaging) .
func (c *Client) GetRetainedMessage(ctx context.Context, params *GetRetainedMessageInput, optFns ...func(*Options)) (*GetRetainedMessageOutput, error) {
if params == nil {
params = &GetRetainedMessageInput{}
}
result, metadata, err := c.invokeOperation(ctx, "GetRetainedMessage", params, optFns, c.addOperationGetRetainedMessageMiddlewares)
if err != nil {
return nil, err
}
out := result.(*GetRetainedMessageOutput)
out.ResultMetadata = metadata
return out, nil
}
// The input for the GetRetainedMessage operation.
type GetRetainedMessageInput struct {
// The topic name of the retained message to retrieve.
//
// This member is required.
Topic *string
noSmithyDocumentSerde
}
// The output from the GetRetainedMessage operation.
type GetRetainedMessageOutput struct {
// The Epoch date and time, in milliseconds, when the retained message was stored
// by IoT.
LastModifiedTime int64
// The Base64-encoded message payload of the retained message body.
Payload []byte
// The quality of service (QoS) level used to publish the retained message.
Qos int32
// The topic name to which the retained message was published.
Topic *string
// A base64-encoded JSON string that includes an array of JSON objects, or null if
// the retained message doesn't include any user properties. The following example
// userProperties parameter is a JSON string that represents two user properties.
// Note that it will be base64-encoded: [{"deviceName": "alpha"}, {"deviceCnt":
// "45"}]
UserProperties []byte
// Metadata pertaining to the operation's result.
ResultMetadata middleware.Metadata
noSmithyDocumentSerde
}
func (c *Client) addOperationGetRetainedMessageMiddlewares(stack *middleware.Stack, options Options) (err error) {
if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
return err
}
err = stack.Serialize.Add(&awsRestjson1_serializeOpGetRetainedMessage{}, middleware.After)
if err != nil {
return err
}
err = stack.Deserialize.Add(&awsRestjson1_deserializeOpGetRetainedMessage{}, middleware.After)
if err != nil {
return err
}
if err := addProtocolFinalizerMiddlewares(stack, options, "GetRetainedMessage"); 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 = addOpGetRetainedMessageValidationMiddleware(stack); err != nil {
return err
}
if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetRetainedMessage(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_opGetRetainedMessage(region string) *awsmiddleware.RegisterServiceMetadata {
return &awsmiddleware.RegisterServiceMetadata{
Region: region,
ServiceID: ServiceID,
OperationName: "GetRetainedMessage",
}
}
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