/
api_op_GetShardIterator.go
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/
api_op_GetShardIterator.go
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// Code generated by smithy-go-codegen DO NOT EDIT.
package kinesis
import (
"context"
"fmt"
awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
"github.com/aws/aws-sdk-go-v2/service/kinesis/types"
"github.com/aws/smithy-go/middleware"
"github.com/aws/smithy-go/ptr"
smithyhttp "github.com/aws/smithy-go/transport/http"
"time"
)
// Gets an Amazon Kinesis shard iterator. A shard iterator expires 5 minutes after
// it is returned to the requester. When invoking this API, you must use either the
// StreamARN or the StreamName parameter, or both. It is recommended that you use
// the StreamARN input parameter when you invoke this API. A shard iterator
// specifies the shard position from which to start reading data records
// sequentially. The position is specified using the sequence number of a data
// record in a shard. A sequence number is the identifier associated with every
// record ingested in the stream, and is assigned when a record is put into the
// stream. Each stream has one or more shards. You must specify the shard iterator
// type. For example, you can set the ShardIteratorType parameter to read exactly
// from the position denoted by a specific sequence number by using the
// AT_SEQUENCE_NUMBER shard iterator type. Alternatively, the parameter can read
// right after the sequence number by using the AFTER_SEQUENCE_NUMBER shard
// iterator type, using sequence numbers returned by earlier calls to PutRecord ,
// PutRecords , GetRecords , or DescribeStream . In the request, you can specify
// the shard iterator type AT_TIMESTAMP to read records from an arbitrary point in
// time, TRIM_HORIZON to cause ShardIterator to point to the last untrimmed record
// in the shard in the system (the oldest data record in the shard), or LATEST so
// that you always read the most recent data in the shard. When you read repeatedly
// from a stream, use a GetShardIterator request to get the first shard iterator
// for use in your first GetRecords request and for subsequent reads use the shard
// iterator returned by the GetRecords request in NextShardIterator . A new shard
// iterator is returned by every GetRecords request in NextShardIterator , which
// you use in the ShardIterator parameter of the next GetRecords request. If a
// GetShardIterator request is made too often, you receive a
// ProvisionedThroughputExceededException . For more information about throughput
// limits, see GetRecords , and Streams Limits (https://docs.aws.amazon.com/kinesis/latest/dev/service-sizes-and-limits.html)
// in the Amazon Kinesis Data Streams Developer Guide. If the shard is closed,
// GetShardIterator returns a valid iterator for the last sequence number of the
// shard. A shard can be closed as a result of using SplitShard or MergeShards .
// GetShardIterator has a limit of five transactions per second per account per
// open shard.
func (c *Client) GetShardIterator(ctx context.Context, params *GetShardIteratorInput, optFns ...func(*Options)) (*GetShardIteratorOutput, error) {
if params == nil {
params = &GetShardIteratorInput{}
}
result, metadata, err := c.invokeOperation(ctx, "GetShardIterator", params, optFns, c.addOperationGetShardIteratorMiddlewares)
if err != nil {
return nil, err
}
out := result.(*GetShardIteratorOutput)
out.ResultMetadata = metadata
return out, nil
}
// Represents the input for GetShardIterator .
type GetShardIteratorInput struct {
// The shard ID of the Kinesis Data Streams shard to get the iterator for.
//
// This member is required.
ShardId *string
// Determines how the shard iterator is used to start reading data records from
// the shard. The following are the valid Amazon Kinesis shard iterator types:
// - AT_SEQUENCE_NUMBER - Start reading from the position denoted by a specific
// sequence number, provided in the value StartingSequenceNumber .
// - AFTER_SEQUENCE_NUMBER - Start reading right after the position denoted by a
// specific sequence number, provided in the value StartingSequenceNumber .
// - AT_TIMESTAMP - Start reading from the position denoted by a specific time
// stamp, provided in the value Timestamp .
// - TRIM_HORIZON - Start reading at the last untrimmed record in the shard in
// the system, which is the oldest data record in the shard.
// - LATEST - Start reading just after the most recent record in the shard, so
// that you always read the most recent data in the shard.
//
// This member is required.
ShardIteratorType types.ShardIteratorType
// The sequence number of the data record in the shard from which to start
// reading. Used with shard iterator type AT_SEQUENCE_NUMBER and
// AFTER_SEQUENCE_NUMBER.
StartingSequenceNumber *string
// The ARN of the stream.
StreamARN *string
// The name of the Amazon Kinesis data stream.
StreamName *string
// The time stamp of the data record from which to start reading. Used with shard
// iterator type AT_TIMESTAMP. A time stamp is the Unix epoch date with precision
// in milliseconds. For example, 2016-04-04T19:58:46.480-00:00 or 1459799926.480 .
// If a record with this exact time stamp does not exist, the iterator returned is
// for the next (later) record. If the time stamp is older than the current trim
// horizon, the iterator returned is for the oldest untrimmed data record
// (TRIM_HORIZON).
Timestamp *time.Time
noSmithyDocumentSerde
}
func (in *GetShardIteratorInput) bindEndpointParams(p *EndpointParameters) {
p.StreamARN = in.StreamARN
p.OperationType = ptr.String("data")
}
// Represents the output for GetShardIterator .
type GetShardIteratorOutput struct {
// The position in the shard from which to start reading data records
// sequentially. A shard iterator specifies this position using the sequence number
// of a data record in a shard.
ShardIterator *string
// Metadata pertaining to the operation's result.
ResultMetadata middleware.Metadata
noSmithyDocumentSerde
}
func (c *Client) addOperationGetShardIteratorMiddlewares(stack *middleware.Stack, options Options) (err error) {
if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
return err
}
err = stack.Serialize.Add(&awsAwsjson11_serializeOpGetShardIterator{}, middleware.After)
if err != nil {
return err
}
err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpGetShardIterator{}, middleware.After)
if err != nil {
return err
}
if err := addProtocolFinalizerMiddlewares(stack, options, "GetShardIterator"); 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 = addClientRequestID(stack); err != nil {
return err
}
if err = addComputeContentLength(stack); err != nil {
return err
}
if err = addResolveEndpointMiddleware(stack, options); err != nil {
return err
}
if err = addComputePayloadSHA256(stack); err != nil {
return err
}
if err = addRetry(stack, options); err != nil {
return err
}
if err = addRawResponseToMetadata(stack); err != nil {
return err
}
if err = 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 = addOpGetShardIteratorValidationMiddleware(stack); err != nil {
return err
}
if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetShardIterator(options.Region), middleware.Before); err != nil {
return err
}
if err = 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_opGetShardIterator(region string) *awsmiddleware.RegisterServiceMetadata {
return &awsmiddleware.RegisterServiceMetadata{
Region: region,
ServiceID: ServiceID,
OperationName: "GetShardIterator",
}
}