gridfs

package
v0.0.16 Latest Latest
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 Go to latest Published: Oct 11, 2018 License: Apache-2.0 Imports: 14 Imported by: 0

Documentation

Index

Constants

View Source 
const DefaultChunkSize int32 = 255 * 1000 // 255 KB

DefaultChunkSize is the default size of each file chunk.

View Source 
const UploadBufferSize = 16 * 1000000 // 16 MB

UploadBufferSize is the size in bytes of one stream batch. Chunks will be written to the db after the sum of chunk lengths is equal to the batch size.

Variables

View Source 
var ErrFileNotFound = errors.New("file with given parameters not found")

ErrFileNotFound occurs if a user asks to download a file with a file ID that isn't found in the files collection.

View Source 
var ErrStreamClosed = errors.New("stream is closed or aborted")

ErrStreamClosed is an error returned if an operation is attempted on a closed/aborted stream.

View Source 
var ErrWrongIndex = errors.New("chunk index does not match expected index")

ErrWrongIndex is used when the chunk retrieved from the server does not have the expected index.

View Source 
var ErrWrongSize = errors.New("chunk size does not match expected size")

ErrWrongSize is used when the chunk retrieved from the server does not have the expected size.

Functions

This section is empty.

Types

type Bucket 

type Bucket struct {
	// contains filtered or unexported fields
}

Bucket represents a GridFS bucket.

func NewBucket 

func NewBucket(db *mongo.Database, opts ...BucketOptioner) (*Bucket, error)

NewBucket creates a GridFS bucket.

func (*Bucket) Delete 

func (b *Bucket) Delete(fileID objectid.ObjectID) error

Delete deletes all chunks and metadata associated with the file with the given file ID.

func (*Bucket) DownloadToStream 

func (b *Bucket) DownloadToStream(fileID objectid.ObjectID, stream io.Writer) (int64, error)

DownloadToStream downloads the file with the specified fileID and writes it to the provided io.Writer. Returns the number of bytes written to the steam and an error, or nil if there was no error.

func (*Bucket) DownloadToStreamByName 

func (b *Bucket) DownloadToStreamByName(filename string, stream io.Writer, opts ...NameOptioner) (int64, error)

DownloadToStreamByName downloads the file with the given name to the given io.Writer.

func (*Bucket) Drop 

func (b *Bucket) Drop() error

Drop drops the files and chunks collections associated with this bucket.

func (*Bucket) Find 

func (b *Bucket) Find(filter interface{}, opts ...FindOptioner) (mongo.Cursor, error)

Find returns the files collection documents that match the given filter.

func (*Bucket) OpenDownloadStream 

func (b *Bucket) OpenDownloadStream(fileID objectid.ObjectID) (*DownloadStream, error)

OpenDownloadStream creates a stream from which the contents of the file can be read.

func (*Bucket) OpenDownloadStreamByName 

func (b *Bucket) OpenDownloadStreamByName(filename string, opts ...NameOptioner) (*DownloadStream, error)

OpenDownloadStreamByName opens a download stream for the file with the given filename.

func (*Bucket) OpenUploadStream 

func (b *Bucket) OpenUploadStream(filename string, opts ...UploadOptioner) (*UploadStream, error)

OpenUploadStream creates a file ID new upload stream for a file given the filename.

func (*Bucket) OpenUploadStreamWithID 

func (b *Bucket) OpenUploadStreamWithID(fileID objectid.ObjectID, filename string, opts ...UploadOptioner) (*UploadStream, error)

OpenUploadStreamWithID creates a new upload stream for a file given the file ID and filename.

func (*Bucket) Rename 

func (b *Bucket) Rename(fileID objectid.ObjectID, newFilename string) error

Rename renames the stored file with the specified file ID.

func (*Bucket) SetReadDeadline 

func (b *Bucket) SetReadDeadline(t time.Time) error

SetReadDeadline sets the read deadline for this bucket

func (*Bucket) SetWriteDeadline 

func (b *Bucket) SetWriteDeadline(t time.Time) error

SetWriteDeadline sets the write deadline for this bucket.

func (*Bucket) UploadFromStream 

func (b *Bucket) UploadFromStream(filename string, source io.Reader, opts ...UploadOptioner) (objectid.ObjectID, error)

UploadFromStream creates a fileID and uploads a file given a source stream.

func (*Bucket) UploadFromStreamWithID 

func (b *Bucket) UploadFromStreamWithID(fileID objectid.ObjectID, filename string, source io.Reader, opts ...UploadOptioner) error

UploadFromStreamWithID uploads a file given a source stream.

type BucketBundle 

type BucketBundle struct {
	// contains filtered or unexported fields
}

BucketBundle is a bundle of BucketOptioner options

func BundleBucket 

func BundleBucket(opts ...BucketOptioner) *BucketBundle

BundleBucket bundles BucketOptioner options.

func (*BucketBundle) BucketName 

func (bb *BucketBundle) BucketName(name string) *BucketBundle

BucketName specifies the name of the bucket. Defaults to 'fs' if not specified.

func (*BucketBundle) ChunkSizeBytes 

func (bb *BucketBundle) ChunkSizeBytes(b int32) *BucketBundle

ChunkSizeBytes specifies the chunk size for the bucket. Defaults to 255KB if not specified.

func (*BucketBundle) ReadConcern 

func (bb *BucketBundle) ReadConcern(rc *readconcern.ReadConcern) *BucketBundle

ReadConcern specifies the read concern for the bucket.

func (*BucketBundle) ReadPreference 

func (bb *BucketBundle) ReadPreference(rp *readpref.ReadPref) *BucketBundle

ReadPreference specifies the read preference for the bucket.

func (*BucketBundle) Unbundle 

func (bb *BucketBundle) Unbundle(deduplicate bool) ([]BucketOptioner, error)

Unbundle transforms a bundle into a slice of BucketOptioner options, deduplicating if specified.

func (*BucketBundle) WriteConcern 

func (bb *BucketBundle) WriteConcern(wc *writeconcern.WriteConcern) *BucketBundle

WriteConcern specifies the write concern for the bucket.

type BucketOptioner 

type BucketOptioner interface {
	// contains filtered or unexported methods
}

BucketOptioner represents all options that can be used to configure a GridFS bucket.

type DownloadStream 

type DownloadStream struct {
	// contains filtered or unexported fields
}

DownloadStream is a io.Reader that can be used to download a file from a GridFS bucket.

func (*DownloadStream) Close 

func (ds *DownloadStream) Close() error

Close closes this download stream.

func (*DownloadStream) Read 

func (ds *DownloadStream) Read(p []byte) (int, error)

Read reads the file from the server and writes it to a destination byte slice.

func (*DownloadStream) SetReadDeadline 

func (ds *DownloadStream) SetReadDeadline(t time.Time) error

SetReadDeadline sets the read deadline for this download stream.

func (*DownloadStream) Skip 

func (ds *DownloadStream) Skip(skip int64) (int64, error)

Skip skips a given number of bytes in the file.

type FindBundle 

type FindBundle struct {
	// contains filtered or unexported fields
}

FindBundle represents a bundle of GridFS Find options.

func BundleFind 

func BundleFind(opts ...FindOptioner) *FindBundle

BundleFind bundles FindOptioner options.

func (*FindBundle) BatchSize 

func (fb *FindBundle) BatchSize(i int32) *FindBundle

BatchSize specifies the number of documents to return per batch.

func (*FindBundle) Limit 

func (fb *FindBundle) Limit(i int32) *FindBundle

Limit specifies the maximum number of documents to return.

func (*FindBundle) MaxTime 

func (fb *FindBundle) MaxTime(d time.Duration) *FindBundle

MaxTime specifies the maximum amount of time to allow the query to run.

func (*FindBundle) NoCursorTimeout 

func (fb *FindBundle) NoCursorTimeout(b bool) *FindBundle

NoCursorTimeout specifies that the server should not time out after an inactivity period.

func (*FindBundle) Skip 

func (fb *FindBundle) Skip(i int32) *FindBundle

Skip specifies the number of documents to skip before returning.

func (*FindBundle) Sort 

func (fb *FindBundle) Sort(sort interface{}) *FindBundle

Sort specifies the order by which to sort results.

func (*FindBundle) Unbundle 

func (fb *FindBundle) Unbundle(deduplicate bool) ([]FindOptioner, error)

Unbundle transforms a bundle into a slice of BucketOptioner options, deduplicating if specified.

type FindOptioner 

type FindOptioner interface {
	// contains filtered or unexported methods
}

FindOptioner represents all options that can be used to configure a find command.

type NameBundle 

type NameBundle struct {
	// contains filtered or unexported fields
}

NameBundle bundles valid options for download by name commands.

func BundleName 

func BundleName(opts ...NameOptioner) *NameBundle

BundleName bundles NameOptioner options.

func (*NameBundle) Revision 

func (nb *NameBundle) Revision(i int32) *NameBundle

Revision specifies which revision of the file to retrieve. Defaults to -1. * Revision numbers are defined as follows: * 0 = the original stored file * 1 = the first revision * 2 = the second revision * etc… * -2 = the second most recent revision * -1 = the most recent revision

func (*NameBundle) Unbundle 

func (nb *NameBundle) Unbundle(deduplicate bool) ([]NameOptioner, error)

Unbundle transforms a bundle into a slice of BucketOptioner options, deduplicating if specified.

type NameOptioner 

type NameOptioner interface {
	// contains filtered or unexported methods
}

NameOptioner represents all options that can be used for a download by name command.

type OptBatchSize 

type OptBatchSize int32

OptBatchSize specifies the number of documents to return per batch.

func BatchSize 

func BatchSize(i int32) OptBatchSize

BatchSize specifies the number of documents to return per batch.

type OptBucketName 

type OptBucketName string

OptBucketName specifies the name of the bucket. Defaults to 'fs' if not specified.

func BucketName 

func BucketName(name string) OptBucketName

BucketName specifies the name of the bucket. Defaults to 'fs' if not specified.

type OptChunkSizeBytes 

type OptChunkSizeBytes int32

OptChunkSizeBytes specifies the chunk size for the bucket. Defaults to 255KB if not specified.

func ChunkSizeBytes 

func ChunkSizeBytes(b int32) OptChunkSizeBytes

ChunkSizeBytes specifies the chunk size for the bucket. Defaults to 255KB if not specified.

type OptLimit 

type OptLimit int32

OptLimit specifies the maximum number of documents to return.

func Limit 

func Limit(i int32) OptLimit

Limit specifies the maximum number of documents to return.

type OptMaxTime 

type OptMaxTime time.Duration

OptMaxTime specifies the maximum amount of time to allow the query to run.

func MaxTime 

func MaxTime(d time.Duration) OptMaxTime

MaxTime specifies the maximum amount of time to allow the query to run.

type OptMetadata 

type OptMetadata struct {
	*bson.Document
}

OptMetadata specifies the metadata for a file upload.

func Metadata 

func Metadata(doc *bson.Document) OptMetadata

Metadata specifies the metadata for a file upload.

type OptNoCursorTimeout 

type OptNoCursorTimeout bool

OptNoCursorTimeout specifies that the server should not time out after an inactivity period.

func NoCursorTimeout 

func NoCursorTimeout(b bool) OptNoCursorTimeout

NoCursorTimeout specifies that the server should not time out after an inactivity period.

type OptReadConcern 

type OptReadConcern struct {
	*readconcern.ReadConcern
}

OptReadConcern specifies the read concern for the bucket.

func ReadConcern 

func ReadConcern(rc *readconcern.ReadConcern) OptReadConcern

ReadConcern specifies the read concern for the bucket.

type OptReadPreference 

type OptReadPreference struct {
	*readpref.ReadPref
}

OptReadPreference specifies the read preference for the bucket.

func ReadPreference 

func ReadPreference(rp *readpref.ReadPref) OptReadPreference

ReadPreference specifies the read preference for the bucket.

type OptRevision 

type OptRevision int32

OptRevision specifies which revision of the file to retrieve. Defaults to -1. * Revision numbers are defined as follows: * 0 = the original stored file * 1 = the first revision * 2 = the second revision * etc… * -2 = the second most recent revision * -1 = the most recent revision

func Revision 

func Revision(i int32) OptRevision

Revision specifies which revision of the file to retrieve. Defaults to -1. * Revision numbers are defined as follows: * 0 = the original stored file * 1 = the first revision * 2 = the second revision * etc… * -2 = the second most recent revision * -1 = the most recent revision

type OptSkip 

type OptSkip int32

OptSkip specifies the number of documents to skip before returning.

func Skip 

func Skip(i int32) OptSkip

Skip specifies the number of documents to skip before returning.

type OptSort 

type OptSort struct {
	Sort interface{}
}

OptSort specifies the order by which to sort results.

func Sort 

func Sort(sort interface{}) OptSort

Sort specifies the order by which to sort results.

type OptWriteConcern 

type OptWriteConcern struct {
	*writeconcern.WriteConcern
}

OptWriteConcern specifies the write concern for the bucket.

func WriteConcern 

func WriteConcern(wc *writeconcern.WriteConcern) OptWriteConcern

WriteConcern specifies the write concern for the bucket.

type Upload 

type Upload struct {
	// contains filtered or unexported fields
}

Upload contains options to upload a file to a bucket.

type UploadBundle 

type UploadBundle struct {
	// contains filtered or unexported fields
}

UploadBundle is a bundle of UploadOptioner options.

func BundleUpload 

func BundleUpload(opts ...UploadOptioner) *UploadBundle

BundleUpload bundles UploadOptioner options.

func (*UploadBundle) ChunkSizeBytes 

func (ub *UploadBundle) ChunkSizeBytes(b int32) *UploadBundle

ChunkSizeBytes specifies the chunk size for the bucket. Defaults to 255KB if not specified.

func (*UploadBundle) Metadata 

func (ub *UploadBundle) Metadata(doc *bson.Document) *UploadBundle

Metadata specifies the metadata for a file upload.

func (*UploadBundle) Unbundle 

func (ub *UploadBundle) Unbundle(deduplicate bool) ([]UploadOptioner, error)

Unbundle transforms a bundle into a slice of BucketOptioner options, deduplicating if specified.

type UploadOptioner 

type UploadOptioner interface {
	// contains filtered or unexported methods
}

UploadOptioner represents all options that can be used to configure a file upload.

type UploadStream 

type UploadStream struct {
	*Upload // chunk size and metadata
	FileID  objectid.ObjectID
	// contains filtered or unexported fields
}

UploadStream is used to upload files in chunks.

func (*UploadStream) Abort 

func (us *UploadStream) Abort() error

Abort closes the stream and deletes all file chunks that have already been written.

func (*UploadStream) Close 

func (us *UploadStream) Close() error

Close closes this upload stream.

func (*UploadStream) SetWriteDeadline 

func (us *UploadStream) SetWriteDeadline(t time.Time) error

SetWriteDeadline sets the write deadline for this stream.

func (*UploadStream) Write 

func (us *UploadStream) Write(p []byte) (int, error)

Write transfers the contents of a byte slice into this upload stream. If the stream's underlying buffer fills up, the buffer will be uploaded as chunks to the server. Implements the io.Writer interface.

Source Files

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