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Package s3manager

Constants

DefaultDownloadConcurrency is the default number of goroutines to spin up when using Download().

const DefaultDownloadConcurrency = 5

DefaultDownloadPartSize is the default range of bytes to get at a time when using Download().

const DefaultDownloadPartSize = 1024 * 1024 * 5

DefaultUploadConcurrency is the default number of goroutines to spin up when using Upload().

const DefaultUploadConcurrency = 5

DefaultUploadPartSize is the default part size to buffer chunks of a payload into.

const DefaultUploadPartSize = MinUploadPartSize

MaxUploadParts is the maximum allowed number of parts in a multi-part upload on Amazon S3.

const MaxUploadParts = 10000

MinUploadPartSize is the minimum allowed part size when uploading a part to Amazon S3.

const MinUploadPartSize int64 = 1024 * 1024 * 5

func GetBucketRegion ¶

func GetBucketRegion(ctx aws.Context, c client.ConfigProvider, bucket, regionHint string, opts ...request.Option) (string, error)

GetBucketRegion will attempt to get the region for a bucket using the regionHint to determine which AWS partition to perform the query on.

The request will not be signed, and will not use your AWS credentials.

A "NotFound" error code will be returned if the bucket does not exist in the AWS partition the regionHint belongs to.

For example to get the region of a bucket which exists in "eu-central-1" you could provide a region hint of "us-west-2".

sess := session.Must(session.NewSession())

bucket := "my-bucket"
region, err := s3manager.GetBucketRegion(ctx, sess, bucket, "us-west-2")
if err != nil {
    if aerr, ok := err.(awserr.Error); ok && aerr.Code() == "NotFound" {
         fmt.Fprintf(os.Stderr, "unable to find bucket %s's region not found\n", bucket)
    }
    return err
}
fmt.Printf("Bucket %s is in %s region\n", bucket, region)

func GetBucketRegionWithClient ¶

func GetBucketRegionWithClient(ctx aws.Context, svc s3iface.S3API, bucket string, opts ...request.Option) (string, error)

GetBucketRegionWithClient is the same as GetBucketRegion with the exception that it takes a S3 service client instead of a Session. The regionHint is derived from the region the S3 service client was created in.

See GetBucketRegion for more information.

func WithDownloaderRequestOptions ¶

func WithDownloaderRequestOptions(opts ...request.Option) func(*Downloader)

WithDownloaderRequestOptions appends to the Downloader's API request options.

func WithUploaderRequestOptions ¶

func WithUploaderRequestOptions(opts ...request.Option) func(*Uploader)

WithUploaderRequestOptions appends to the Uploader's API request options.

type Downloader ¶

The Downloader structure that calls Download(). It is safe to call Download() on this structure for multiple objects and across concurrent goroutines. Mutating the Downloader's properties is not safe to be done concurrently.

type Downloader struct {
    // The buffer size (in bytes) to use when buffering data into chunks and
    // sending them as parts to S3. The minimum allowed part size is 5MB, and
    // if this value is set to zero, the DefaultDownloadPartSize value will be used.
    //
    // PartSize is ignored if the Range input parameter is provided.
    PartSize int64

    // The number of goroutines to spin up in parallel when sending parts.
    // If this is set to zero, the DefaultDownloadConcurrency value will be used.
    //
    // Concurrency is ignored if the Range input parameter is provided.
    Concurrency int

    // An S3 client to use when performing downloads.
    S3 s3iface.S3API

    // List of request options that will be passed down to individual API
    // operation requests made by the downloader.
    RequestOptions []request.Option
}

func NewDownloader ¶

func NewDownloader(c client.ConfigProvider, options ...func(*Downloader)) *Downloader

NewDownloader creates a new Downloader instance to downloads objects from S3 in concurrent chunks. Pass in additional functional options to customize the downloader behavior. Requires a client.ConfigProvider in order to create a S3 service client. The session.Session satisfies the client.ConfigProvider interface.

Example:

// The session the S3 Downloader will use
sess := session.Must(session.NewSession())

// Create a downloader with the session and default options
downloader := s3manager.NewDownloader(sess)

// Create a downloader with the session and custom options
downloader := s3manager.NewDownloader(sess, func(d *s3manager.Downloader) {
     d.PartSize = 64 * 1024 * 1024 // 64MB per part
})

func NewDownloaderWithClient ¶

func NewDownloaderWithClient(svc s3iface.S3API, options ...func(*Downloader)) *Downloader

NewDownloaderWithClient creates a new Downloader instance to downloads objects from S3 in concurrent chunks. Pass in additional functional options to customize the downloader behavior. Requires a S3 service client to make S3 API calls.

Example:

// The session the S3 Downloader will use
sess := session.Must(session.NewSession())

// The S3 client the S3 Downloader will use
s3Svc := s3.new(sess)

// Create a downloader with the s3 client and default options
downloader := s3manager.NewDownloaderWithClient(s3Svc)

// Create a downloader with the s3 client and custom options
downloader := s3manager.NewDownloaderWithClient(s3Svc, func(d *s3manager.Downloader) {
     d.PartSize = 64 * 1024 * 1024 // 64MB per part
})

func (Downloader) Download ¶

func (d Downloader) Download(w io.WriterAt, input *s3.GetObjectInput, options ...func(*Downloader)) (n int64, err error)

Download downloads an object in S3 and writes the payload into w using concurrent GET requests.

Additional functional options can be provided to configure the individual download. These options are copies of the Downloader instance Download is called from. Modifying the options will not impact the original Downloader instance.

It is safe to call this method concurrently across goroutines.

The w io.WriterAt can be satisfied by an os.File to do multipart concurrent downloads, or in memory []byte wrapper using aws.WriteAtBuffer.

If the GetObjectInput's Range value is provided that will cause the downloader to perform a single GetObjectInput request for that object's range. This will caused the part size, and concurrency configurations to be ignored.

func (Downloader) DownloadWithContext ¶

func (d Downloader) DownloadWithContext(ctx aws.Context, w io.WriterAt, input *s3.GetObjectInput, options ...func(*Downloader)) (n int64, err error)

DownloadWithContext downloads an object in S3 and writes the payload into w using concurrent GET requests.

DownloadWithContext is the same as Download with the additional support for Context input parameters. The Context must not be nil. A nil Context will cause a panic. Use the Context to add deadlining, timeouts, ect. The DownloadWithContext may create sub-contexts for individual underlying requests.

Additional functional options can be provided to configure the individual download. These options are copies of the Downloader instance Download is called from. Modifying the options will not impact the original Downloader instance. Use the WithDownloaderRequestOptions helper function to pass in request options that will be applied to all API operations made with this downloader.

The w io.WriterAt can be satisfied by an os.File to do multipart concurrent downloads, or in memory []byte wrapper using aws.WriteAtBuffer.

It is safe to call this method concurrently across goroutines.

If the GetObjectInput's Range value is provided that will cause the downloader to perform a single GetObjectInput request for that object's range. This will caused the part size, and concurrency configurations to be ignored.

type MultiUploadFailure ¶

A MultiUploadFailure wraps a failed S3 multipart upload. An error returned will satisfy this interface when a multi part upload failed to upload all chucks to S3. In the case of a failure the UploadID is needed to operate on the chunks, if any, which were uploaded.

Example:

u := s3manager.NewUploader(opts)
output, err := u.upload(input)
if err != nil {
    if multierr, ok := err.(s3manager.MultiUploadFailure); ok {
        // Process error and its associated uploadID
        fmt.Println("Error:", multierr.Code(), multierr.Message(), multierr.UploadID())
    } else {
        // Process error generically
        fmt.Println("Error:", err.Error())
    }
}

type MultiUploadFailure interface {
    awserr.Error

    // Returns the upload id for the S3 multipart upload that failed.
    UploadID() string
}

type UploadInput ¶

UploadInput contains all input for upload requests to Amazon S3.

type UploadInput struct {
    // The canned ACL to apply to the object.
    ACL *string `location:"header" locationName:"x-amz-acl" type:"string"`

    Bucket *string `location:"uri" locationName:"Bucket" type:"string" required:"true"`

    // Specifies caching behavior along the request/reply chain.
    CacheControl *string `location:"header" locationName:"Cache-Control" type:"string"`

    // Specifies presentational information for the object.
    ContentDisposition *string `location:"header" locationName:"Content-Disposition" type:"string"`

    // Specifies what content encodings have been applied to the object and thus
    // what decoding mechanisms must be applied to obtain the media-type referenced
    // by the Content-Type header field.
    ContentEncoding *string `location:"header" locationName:"Content-Encoding" type:"string"`

    // The language the content is in.
    ContentLanguage *string `location:"header" locationName:"Content-Language" type:"string"`

    // A standard MIME type describing the format of the object data.
    ContentType *string `location:"header" locationName:"Content-Type" type:"string"`

    // The date and time at which the object is no longer cacheable.
    Expires *time.Time `location:"header" locationName:"Expires" type:"timestamp" timestampFormat:"rfc822"`

    // Gives the grantee READ, READ_ACP, and WRITE_ACP permissions on the object.
    GrantFullControl *string `location:"header" locationName:"x-amz-grant-full-control" type:"string"`

    // Allows grantee to read the object data and its metadata.
    GrantRead *string `location:"header" locationName:"x-amz-grant-read" type:"string"`

    // Allows grantee to read the object ACL.
    GrantReadACP *string `location:"header" locationName:"x-amz-grant-read-acp" type:"string"`

    // Allows grantee to write the ACL for the applicable object.
    GrantWriteACP *string `location:"header" locationName:"x-amz-grant-write-acp" type:"string"`

    Key *string `location:"uri" locationName:"Key" type:"string" required:"true"`

    // A map of metadata to store with the object in S3.
    Metadata map[string]*string `location:"headers" locationName:"x-amz-meta-" type:"map"`

    // Confirms that the requester knows that she or he will be charged for the
    // request. Bucket owners need not specify this parameter in their requests.
    // Documentation on downloading objects from requester pays buckets can be found
    // at http://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectsinRequesterPaysBuckets.html
    RequestPayer *string `location:"header" locationName:"x-amz-request-payer" type:"string"`

    // Specifies the algorithm to use to when encrypting the object (e.g., AES256,
    // aws:kms).
    SSECustomerAlgorithm *string `location:"header" locationName:"x-amz-server-side-encryption-customer-algorithm" type:"string"`

    // Specifies the customer-provided encryption key for Amazon S3 to use in encrypting
    // data. This value is used to store the object and then it is discarded; Amazon
    // does not store the encryption key. The key must be appropriate for use with
    // the algorithm specified in the x-amz-server-side​-encryption​-customer-algorithm
    // header.
    SSECustomerKey *string `location:"header" locationName:"x-amz-server-side-encryption-customer-key" type:"string"`

    // Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321.
    // Amazon S3 uses this header for a message integrity check to ensure the encryption
    // key was transmitted without error.
    SSECustomerKeyMD5 *string `location:"header" locationName:"x-amz-server-side-encryption-customer-key-MD5" type:"string"`

    // Specifies the AWS KMS key ID to use for object encryption. All GET and PUT
    // requests for an object protected by AWS KMS will fail if not made via SSL
    // or using SigV4. Documentation on configuring any of the officially supported
    // AWS SDKs and CLI can be found at http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingAWSSDK.html#specify-signature-version
    SSEKMSKeyId *string `location:"header" locationName:"x-amz-server-side-encryption-aws-kms-key-id" type:"string"`

    // The Server-side encryption algorithm used when storing this object in S3
    // (e.g., AES256, aws:kms).
    ServerSideEncryption *string `location:"header" locationName:"x-amz-server-side-encryption" type:"string"`

    // The type of storage to use for the object. Defaults to 'STANDARD'.
    StorageClass *string `location:"header" locationName:"x-amz-storage-class" type:"string"`

    // The tag-set for the object. The tag-set must be encoded as URL Query parameters
    Tagging *string `location:"header" locationName:"x-amz-tagging" type:"string"`

    // If the bucket is configured as a website, redirects requests for this object
    // to another object in the same bucket or to an external URL. Amazon S3 stores
    // the value of this header in the object metadata.
    WebsiteRedirectLocation *string `location:"header" locationName:"x-amz-website-redirect-location" type:"string"`

    // The readable body payload to send to S3.
    Body io.Reader
}

type UploadOutput ¶

UploadOutput represents a response from the Upload() call.

type UploadOutput struct {
    // The URL where the object was uploaded to.
    Location string

    // The version of the object that was uploaded. Will only be populated if
    // the S3 Bucket is versioned. If the bucket is not versioned this field
    // will not be set.
    VersionID *string

    // The ID for a multipart upload to S3. In the case of an error the error
    // can be cast to the MultiUploadFailure interface to extract the upload ID.
    UploadID string
}

type Uploader ¶

The Uploader structure that calls Upload(). It is safe to call Upload() on this structure for multiple objects and across concurrent goroutines. Mutating the Uploader's properties is not safe to be done concurrently.

type Uploader struct {
    // The buffer size (in bytes) to use when buffering data into chunks and
    // sending them as parts to S3. The minimum allowed part size is 5MB, and
    // if this value is set to zero, the DefaultUploadPartSize value will be used.
    PartSize int64

    // The number of goroutines to spin up in parallel when sending parts.
    // If this is set to zero, the DefaultUploadConcurrency value will be used.
    Concurrency int

    // Setting this value to true will cause the SDK to avoid calling
    // AbortMultipartUpload on a failure, leaving all successfully uploaded
    // parts on S3 for manual recovery.
    //
    // Note that storing parts of an incomplete multipart upload counts towards
    // space usage on S3 and will add additional costs if not cleaned up.
    LeavePartsOnError bool

    // MaxUploadParts is the max number of parts which will be uploaded to S3.
    // Will be used to calculate the partsize of the object to be uploaded.
    // E.g: 5GB file, with MaxUploadParts set to 100, will upload the file
    // as 100, 50MB parts.
    // With a limited of s3.MaxUploadParts (10,000 parts).
    MaxUploadParts int

    // The client to use when uploading to S3.
    S3 s3iface.S3API

    // List of request options that will be passed down to individual API
    // operation requests made by the uploader.
    RequestOptions []request.Option
}

func NewUploader ¶

func NewUploader(c client.ConfigProvider, options ...func(*Uploader)) *Uploader

NewUploader creates a new Uploader instance to upload objects to S3. Pass In additional functional options to customize the uploader's behavior. Requires a client.ConfigProvider in order to create a S3 service client. The session.Session satisfies the client.ConfigProvider interface.

Example:

// The session the S3 Uploader will use
sess := session.Must(session.NewSession())

// Create an uploader with the session and default options
uploader := s3manager.NewUploader(sess)

// Create an uploader with the session and custom options
uploader := s3manager.NewUploader(session, func(u *s3manager.Uploader) {
     u.PartSize = 64 * 1024 * 1024 // 64MB per part
})

func NewUploaderWithClient ¶

func NewUploaderWithClient(svc s3iface.S3API, options ...func(*Uploader)) *Uploader

NewUploaderWithClient creates a new Uploader instance to upload objects to S3. Pass in additional functional options to customize the uploader's behavior. Requires a S3 service client to make S3 API calls.

Example:

// The session the S3 Uploader will use
sess := session.Must(session.NewSession())

// S3 service client the Upload manager will use.
s3Svc := s3.New(sess)

// Create an uploader with S3 client and default options
uploader := s3manager.NewUploaderWithClient(s3Svc)

// Create an uploader with S3 client and custom options
uploader := s3manager.NewUploaderWithClient(s3Svc, func(u *s3manager.Uploader) {
     u.PartSize = 64 * 1024 * 1024 // 64MB per part
})

func (Uploader) Upload ¶

func (u Uploader) Upload(input *UploadInput, options ...func(*Uploader)) (*UploadOutput, error)

Upload uploads an object to S3, intelligently buffering large files into smaller chunks and sending them in parallel across multiple goroutines. You can configure the buffer size and concurrency through the Uploader's parameters.

Additional functional options can be provided to configure the individual upload. These options are copies of the Uploader instance Upload is called from. Modifying the options will not impact the original Uploader instance.

Use the WithUploaderRequestOptions helper function to pass in request options that will be applied to all API operations made with this uploader.

It is safe to call this method concurrently across goroutines.

Example:

// Upload input parameters
upParams := &s3manager.UploadInput{
    Bucket: &bucketName,
    Key:    &keyName,
    Body:   file,
}

// Perform an upload.
result, err := uploader.Upload(upParams)

// Perform upload with options different than the those in the Uploader.
result, err := uploader.Upload(upParams, func(u *s3manager.Uploader) {
     u.PartSize = 10 * 1024 * 1024 // 10MB part size
     u.LeavePartsOnError = true    // Don't delete the parts if the upload fails.
})

func (Uploader) UploadWithContext ¶

func (u Uploader) UploadWithContext(ctx aws.Context, input *UploadInput, opts ...func(*Uploader)) (*UploadOutput, error)

UploadWithContext uploads an object to S3, intelligently buffering large files into smaller chunks and sending them in parallel across multiple goroutines. You can configure the buffer size and concurrency through the Uploader's parameters.

UploadWithContext is the same as Upload with the additional support for Context input parameters. The Context must not be nil. A nil Context will cause a panic. Use the context to add deadlining, timeouts, ect. The UploadWithContext may create sub-contexts for individual underlying requests.

Additional functional options can be provided to configure the individual upload. These options are copies of the Uploader instance Upload is called from. Modifying the options will not impact the original Uploader instance.

Use the WithUploaderRequestOptions helper function to pass in request options that will be applied to all API operations made with this uploader.

It is safe to call this method concurrently across goroutines.

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