uplink

package
v0.14.1 Latest Latest
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 Go to latest Published: Jun 26, 2019 License: AGPL-3.0 Imports: 21 Imported by: 0

Documentation

Overview

Package uplink provides variety of functions to access the objects using storj's uplink library

Example (Interface) 
package main

import (
	"bytes"
	"context"
	"fmt"
	"io/ioutil"
	"log"

	"storj.io/storj/lib/uplink"
	"storj.io/storj/pkg/storj"
)

func logClose(fn func() error) {
	err := fn()
	if err != nil {
		fmt.Println(err)
	}
}

// WorkWithLibUplink uploads the specified data to the specified path in the
// specified bucket, using the specified Satellite, encryption key, and API key.
func WorkWithLibUplink(satelliteAddress string, encryptionKey *storj.Key, apiKey uplink.APIKey,
	bucketName, uploadPath string, dataToUpload []byte) error {
	ctx := context.Background()

	// Create an Uplink object with a default config
	upl, err := uplink.NewUplink(ctx, nil)
	if err != nil {
		return fmt.Errorf("could not create new Uplink object: %v", err)
	}
	defer logClose(upl.Close)

	// Open up the Project we will be working with
	proj, err := upl.OpenProject(ctx, satelliteAddress, apiKey)
	if err != nil {
		return fmt.Errorf("could not open project: %v", err)
	}
	defer logClose(proj.Close)

	// Create the desired Bucket within the Project
	_, err = proj.CreateBucket(ctx, bucketName, nil)
	if err != nil {
		return fmt.Errorf("could not create bucket: %v", err)
	}

	// Open up the desired Bucket within the Project
	bucket, err := proj.OpenBucket(ctx, bucketName, &uplink.EncryptionAccess{Key: *encryptionKey})
	if err != nil {
		return fmt.Errorf("could not open bucket %q: %v", bucketName, err)
	}
	defer logClose(bucket.Close)

	// Upload our Object to the specified path
	buf := bytes.NewBuffer(dataToUpload)
	err = bucket.UploadObject(ctx, uploadPath, buf, nil)
	if err != nil {
		return fmt.Errorf("could not upload: %v", err)
	}

	// Initiate a download of the same object again
	readBack, err := bucket.OpenObject(ctx, uploadPath)
	if err != nil {
		return fmt.Errorf("could not open object at %q: %v", uploadPath, err)
	}
	defer logClose(readBack.Close)

	// We want the whole thing, so range from 0 to -1
	strm, err := readBack.DownloadRange(ctx, 0, -1)
	if err != nil {
		return fmt.Errorf("could not initiate download: %v", err)
	}
	defer logClose(strm.Close)

	// Read everything from the stream
	receivedContents, err := ioutil.ReadAll(strm)
	if err != nil {
		return fmt.Errorf("could not read object: %v", err)
	}

	if !bytes.Equal(receivedContents, dataToUpload) {
		return fmt.Errorf("got different object back: %q != %q", dataToUpload, receivedContents)
	}
	return nil
}

func main() {

	const (
		myAPIKey = "change-me-to-the-api-key-created-in-satellite-gui"

		satellite       = "mars.tardigrade.io:7777"
		myBucket        = "my-first-bucket"
		myUploadPath    = "foo/bar/baz"
		myData          = "one fish two fish red fish blue fish"
		myEncryptionKey = "you'll never guess this"
	)

	var encryptionKey storj.Key
	copy(encryptionKey[:], []byte(myEncryptionKey))

	apiKey, err := uplink.ParseAPIKey(myAPIKey)
	if err != nil {
		log.Fatal("could not parse api key:", err)
	}

	err = WorkWithLibUplink(satellite, &encryptionKey, apiKey, myBucket, myUploadPath, []byte(myData))
	if err != nil {
		log.Fatal("error:", err)
	}

	fmt.Println("success!")
}

Output:

Index

Examples

Constants

This section is empty.

Variables

View Source 
var (

	// Error is the toplevel class of errors for the uplink library.
	Error = errs.Class("libuplink")
)

Functions

This section is empty.

Types

type APIKey 

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

APIKey represents an access credential to certain resources

func ParseAPIKey 

func ParseAPIKey(val string) (APIKey, error)

ParseAPIKey parses an API key

func (APIKey) Restrict added in v0.14.0 

func (a APIKey) Restrict(caveat macaroon.Caveat) (APIKey, error)

Restrict generates a new APIKey with the provided Caveat attached.

func (APIKey) Serialize 

func (a APIKey) Serialize() string

Serialize serializes the API key to a string

type Bucket 

type Bucket struct {
	BucketConfig
	Name    string
	Created time.Time
	// contains filtered or unexported fields
}

Bucket represents operations you can perform on a bucket

func (*Bucket) Close 

func (b *Bucket) Close() error

Close closes the Bucket session.

func (*Bucket) DeleteObject 

func (b *Bucket) DeleteObject(ctx context.Context, path storj.Path) (err error)

DeleteObject removes an object, if authorized.

func (*Bucket) ListObjects 

func (b *Bucket) ListObjects(ctx context.Context, cfg *ListOptions) (list storj.ObjectList, err error)

ListObjects lists objects a user is authorized to see.

func (*Bucket) NewReader added in v0.12.0 

func (b *Bucket) NewReader(ctx context.Context, path storj.Path) (_ ReadSeekCloser, err error)

NewReader creates a new reader that downloads the object data.

func (*Bucket) NewWriter added in v0.12.0 

func (b *Bucket) NewWriter(ctx context.Context, path storj.Path, opts *UploadOptions) (_ io.WriteCloser, err error)

NewWriter creates a writer which uploads the object.

func (*Bucket) OpenObject 

func (b *Bucket) OpenObject(ctx context.Context, path storj.Path) (o *Object, err error)

OpenObject returns an Object handle, if authorized.

func (*Bucket) UploadObject 

func (b *Bucket) UploadObject(ctx context.Context, path storj.Path, data io.Reader, opts *UploadOptions) (err error)

UploadObject uploads a new object, if authorized.

type BucketConfig 

type BucketConfig struct {
	// PathCipher indicates which cipher suite is to be used for path
	// encryption within the new Bucket. If not set, AES-GCM encryption
	// will be used.
	PathCipher storj.CipherSuite

	// EncryptionParameters specifies the default encryption parameters to
	// be used for data encryption of new Objects in this bucket.
	EncryptionParameters storj.EncryptionParameters

	// Volatile groups config values that are likely to change semantics
	// or go away entirely between releases. Be careful when using them!
	Volatile struct {
		// RedundancyScheme defines the default Reed-Solomon and/or
		// Forward Error Correction encoding parameters to be used by
		// objects in this Bucket.
		RedundancyScheme storj.RedundancyScheme
		// SegmentsSize is the default segment size to use for new
		// objects in this Bucket.
		SegmentsSize memory.Size
	}
}

BucketConfig holds information about a bucket's configuration. This is filled in by the caller for use with CreateBucket(), or filled in by the library as Bucket.Config when a bucket is returned from OpenBucket().

type BucketListOptions 

type BucketListOptions = storj.BucketListOptions

BucketListOptions controls options to the ListBuckets() call.

type Config 

type Config struct {
	// Volatile groups config values that are likely to change semantics
	// or go away entirely between releases. Be careful when using them!
	Volatile struct {
		// TLS defines options that affect TLS negotiation for outbound
		// connections initiated by this uplink.
		TLS struct {
			// SkipPeerCAWhitelist determines whether to require all
			// remote hosts to have identity certificates signed by
			// Certificate Authorities in the default whitelist. If
			// set to true, the whitelist will be ignored.
			SkipPeerCAWhitelist bool

			// PeerCAWhitelistPath gives the path to a CA cert
			// whitelist file. It is ignored if SkipPeerCAWhitelist
			// is set. If empty, the internal default peer whitelist
			// is used.
			PeerCAWhitelistPath string
		}

		// PeerIDVersion is the identity versions remote peers to this node
		// will be supported by this node.
		PeerIDVersion string

		// MaxInlineSize determines whether the uplink will attempt to
		// store a new object in the satellite's metainfo. Objects at
		// or below this size will be marked for inline storage, and
		// objects above this size will not. (The satellite may reject
		// the inline storage and require remote storage, still.)
		MaxInlineSize memory.Size

		// MaxMemory is the default maximum amount of memory to be
		// allocated for read buffers while performing decodes of
		// objects. (This option is overrideable per Bucket if the user
		// so desires.) If set to zero, the library default (4 MiB) will
		// be used. If set to a negative value, the system will use the
		// smallest amount of memory it can.
		MaxMemory memory.Size
	}
}

Config represents configuration options for an Uplink

type EncryptionAccess 

type EncryptionAccess struct {
	// Key is the base encryption key to be used for decrypting objects.
	Key storj.Key
	// EncryptedPathPrefix is the (possibly empty) encrypted version of the
	// path from the top of the storage Bucket to this point. This is
	// necessary to have in order to derive further encryption keys.
	EncryptedPathPrefix storj.Path
}

EncryptionAccess specifies the encryption details needed to encrypt or decrypt objects.

type ListOptions 

type ListOptions = storj.ListOptions

ListOptions controls options for the ListObjects() call.

type Object 

type Object struct {
	// Meta holds the metainfo associated with the Object.
	Meta ObjectMeta
	// contains filtered or unexported fields
}

An Object is a sequence of bytes with associated metadata, stored in the Storj network (or being prepared for such storage). It belongs to a specific bucket, and has a path and a size. It is comparable to a "file" in a conventional filesystem.

func (*Object) Close 

func (o *Object) Close() error

Close closes the Object.

func (*Object) DownloadRange 

func (o *Object) DownloadRange(ctx context.Context, offset, length int64) (_ io.ReadCloser, err error)

DownloadRange returns an Object's data. A length of -1 will mean (Object.Size - offset).

type ObjectMeta 

type ObjectMeta struct {
	// Bucket gives the name of the bucket in which an Object is placed.
	Bucket string
	// Path is the path of the Object within the Bucket. Path components are
	// forward-slash-separated, like Unix file paths ("one/two/three").
	Path storj.Path
	// IsPrefix is true if this ObjectMeta does not refer to a specific
	// Object, but to some arbitrary point in the path hierarchy. This would
	// be called a "folder" or "directory" in a typical filesystem.
	IsPrefix bool

	// ContentType, if set, gives a MIME content-type for the Object, as
	// set when the object was created.
	ContentType string
	// Metadata contains the additional information about an Object that was
	// set when the object was created. See UploadOptions.Metadata for more
	// information.
	Metadata map[string]string

	// Created is the time at which the Object was created.
	Created time.Time
	// Modified is the time at which the Object was last modified.
	Modified time.Time
	// Expires is the time at which the Object expires (after which it will
	// be automatically deleted from storage nodes).
	Expires time.Time

	// Size gives the size of the Object in bytes.
	Size int64
	// Checksum gives a checksum of the contents of the Object.
	Checksum []byte

	// Volatile groups config values that are likely to change semantics
	// or go away entirely between releases. Be careful when using them!
	Volatile struct {
		// EncryptionParameters gives the encryption parameters being
		// used for the Object's data encryption.
		EncryptionParameters storj.EncryptionParameters

		// RedundancyScheme determines the Reed-Solomon and/or Forward
		// Error Correction encoding parameters to be used for this
		// Object.
		RedundancyScheme storj.RedundancyScheme

		// SegmentsSize gives the segment size being used for the
		// Object's data storage.
		SegmentsSize int64
	}
}

ObjectMeta contains metadata about a specific Object.

type Project 

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

Project represents a specific project access session.

func (*Project) Close 

func (p *Project) Close() error

Close closes the Project.

func (*Project) CreateBucket 

func (p *Project) CreateBucket(ctx context.Context, name string, cfg *BucketConfig) (bucket storj.Bucket, err error)

CreateBucket creates a new bucket if authorized.

func (*Project) DeleteBucket 

func (p *Project) DeleteBucket(ctx context.Context, bucket string) (err error)

DeleteBucket deletes a bucket if authorized. If the bucket contains any Objects at the time of deletion, they may be lost permanently.

func (*Project) GetBucketInfo 

func (p *Project) GetBucketInfo(ctx context.Context, bucket string) (b storj.Bucket, bi *BucketConfig, err error)

GetBucketInfo returns info about the requested bucket if authorized.

func (*Project) ListBuckets 

func (p *Project) ListBuckets(ctx context.Context, opts *BucketListOptions) (bl storj.BucketList, err error)

ListBuckets will list authorized buckets.

func (*Project) OpenBucket 

func (p *Project) OpenBucket(ctx context.Context, bucketName string, access *EncryptionAccess) (b *Bucket, err error)

OpenBucket returns a Bucket handle with the given EncryptionAccess information.

type ReadSeekCloser added in v0.12.0 

type ReadSeekCloser interface {
	io.Reader
	io.Seeker
	io.Closer
}

ReadSeekCloser combines interfaces io.Reader, io.Seeker, io.Closer 

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

Uplink represents the main entrypoint to Storj V3. An Uplink connects to a specific Satellite and caches connections and resources, allowing one to create sessions delineated by specific access controls. 

func NewUplink(ctx context.Context, cfg *Config) (_ *Uplink, err error)

NewUplink creates a new Uplink. This is the first step to create an uplink session with a user specified config or with default config, if nil config

func (*Uplink) Close 

func (u *Uplink) Close() error

Close closes the Uplink. This may not do anything at present, but should still be called to allow forward compatibility. No Project or Bucket objects using this Uplink should be used after calling Close.

func (*Uplink) OpenProject 

func (u *Uplink) OpenProject(ctx context.Context, satelliteAddr string, apiKey APIKey) (p *Project, err error)

OpenProject returns a Project handle with the given APIKey

type UploadOptions 

type UploadOptions struct {
	// ContentType, if set, gives a MIME content-type for the Object.
	ContentType string
	// Metadata contains additional information about an Object. It can
	// hold arbitrary textual fields and can be retrieved together with the
	// Object. Field names can be at most 1024 bytes long. Field values are
	// not individually limited in size, but the total of all metadata
	// (fields and values) can not exceed 4 kiB.
	Metadata map[string]string
	// Expires is the time at which the new Object can expire (be deleted
	// automatically from storage nodes).
	Expires time.Time

	// Volatile groups config values that are likely to change semantics
	// or go away entirely between releases. Be careful when using them!
	Volatile struct {
		// EncryptionParameters determines the cipher suite to use for
		// the Object's data encryption. If not set, the Bucket's
		// defaults will be used.
		EncryptionParameters storj.EncryptionParameters

		// RedundancyScheme determines the Reed-Solomon and/or Forward
		// Error Correction encoding parameters to be used for this
		// Object.
		RedundancyScheme storj.RedundancyScheme
	}
}

UploadOptions controls options about uploading a new Object, if authorized.

Source Files

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