helpers

package
v0.26.0 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Dec 19, 2024 License: Apache-2.0, MIT Imports: 13 Imported by: 37

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var BlockSizeLimit = 1048576 // 1 MB

BlockSizeLimit specifies the maximum size an imported block can have.

View Source 
var DefaultLinksPerBlock = roughLinkBlockSize / roughLinkSize

DefaultLinksPerBlock governs how the importer decides how many links there will be per block. This calculation is based on expected distributions of:

  • the expected distribution of block sizes
  • the expected distribution of link sizes
  • desired access speed

For now, we use: 

var roughLinkBlockSize = 1 << 13 // 8KB
var roughLinkSize = 34 + 8 + 5   // sha256 multihash + size + no name
                                 // + protobuf framing
var DefaultLinksPerBlock = (roughLinkBlockSize / roughLinkSize)
                         = ( 8192 / 47 )
                         = (approximately) 174
View Source 
var ErrMissingFsRef = errors.New("missing file path or URL, can't create filestore reference")
View Source 
var ErrSizeLimitExceeded = errors.New("object size limit exceeded")

ErrSizeLimitExceeded signals that a block is larger than BlockSizeLimit.

Functions

This section is empty.

Types

type DagBuilderHelper 

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

DagBuilderHelper wraps together a bunch of objects needed to efficiently create unixfs dag trees

func (*DagBuilderHelper) Add 

func (db *DagBuilderHelper) Add(node ipld.Node) error

Add inserts the given node in the DAGService.

func (*DagBuilderHelper) Done 

func (db *DagBuilderHelper) Done() bool

Done returns whether or not we're done consuming the incoming data.

func (*DagBuilderHelper) FillNodeLayer 

func (db *DagBuilderHelper) FillNodeLayer(node *FSNodeOverDag) error

FillNodeLayer will add data-nodes as children to the given node until it is full in this layer or no more data.

NOTE: This function creates raw data nodes, so it only works for the `trickle.Layout`.

func (*DagBuilderHelper) GetCidBuilder 

func (db *DagBuilderHelper) GetCidBuilder() cid.Builder

GetCidBuilder returns the internal `cid.CidBuilder` set in the builder.

func (*DagBuilderHelper) GetDagServ 

func (db *DagBuilderHelper) GetDagServ() ipld.DAGService

GetDagServ returns the dagservice object this Helper is using

func (*DagBuilderHelper) HasFileAttributes added in v0.23.0 

func (db *DagBuilderHelper) HasFileAttributes() bool

HasFileAttributes will return false if Filestore is being used, otherwise returns true if a file mode or last modification time is set. 

func (db *DagBuilderHelper) Maxlinks() int

Maxlinks returns the configured maximum number for links for nodes built with this helper.

func (*DagBuilderHelper) NewFSNFromDag 

func (db *DagBuilderHelper) NewFSNFromDag(nd *dag.ProtoNode) (*FSNodeOverDag, error)

NewFSNFromDag reconstructs a FSNodeOverDag node from a given dag node

func (*DagBuilderHelper) NewFSNodeOverDag 

func (db *DagBuilderHelper) NewFSNodeOverDag(fsNodeType pb.Data_DataType) *FSNodeOverDag

NewFSNodeOverDag creates a new `dag.ProtoNode` and `ft.FSNode` decoupled from one anonther (and will continue in that way until `Commit` is called), with `fsNodeType` specifying the type of the UnixFS layer node (either `File` or `Raw`).

func (*DagBuilderHelper) NewLeafDataNode 

func (db *DagBuilderHelper) NewLeafDataNode(fsNodeType pb.Data_DataType) (node ipld.Node, dataSize uint64, err error)

NewLeafDataNode builds the `node` with the data obtained from the Splitter with the given constraints (BlockSizeLimit, RawLeaves) specified when creating the DagBuilderHelper. It returns `ipld.Node` with the `dataSize` (that will be used to keep track of the DAG file size). The size of the data is computed here because after that it will be hidden by `NewLeafNode` inside a generic `ipld.Node` representation.

func (*DagBuilderHelper) NewLeafNode 

func (db *DagBuilderHelper) NewLeafNode(data []byte, fsNodeType pb.Data_DataType) (ipld.Node, error)

NewLeafNode creates a leaf node filled with data. If rawLeaves is defined then a raw leaf will be returned. Otherwise, it will create and return `FSNodeOverDag` with `fsNodeType`.

func (*DagBuilderHelper) Next 

func (db *DagBuilderHelper) Next() ([]byte, error)

Next returns the next chunk of data to be inserted into the dag if it returns nil, that signifies that the stream is at an end, and that the current building operation should finish.

func (*DagBuilderHelper) ProcessFileStore 

func (db *DagBuilderHelper) ProcessFileStore(node ipld.Node, dataSize uint64) ipld.Node

ProcessFileStore generates, if Filestore is being used, the `FilestoreNode` representation of the `ipld.Node` that contains the file data. If Filestore is not being used just return the same node to continue with its addition to the DAG.

The `db.offset` is updated at this point (instead of when `NewLeafDataNode` is called, both work in tandem but the offset is more related to this function).

func (*DagBuilderHelper) SetFileAttributes added in v0.23.0 

func (db *DagBuilderHelper) SetFileAttributes(n ipld.Node) error

SetFileAttributes stores file attributes present in the `DagBuilderHelper` into the associated `ft.FSNode`.

type DagBuilderParams 

type DagBuilderParams struct {
	// Maximum number of links per intermediate node
	Maxlinks int

	// RawLeaves signifies that the importer should use raw ipld nodes as leaves
	// instead of using the unixfs TRaw type
	RawLeaves bool

	// CID Builder to use if set
	CidBuilder cid.Builder

	// DAGService to write blocks to (required)
	Dagserv ipld.DAGService

	// The unixfs file mode
	FileMode os.FileMode

	// The unixfs last modified time
	FileModTime time.Time

	// NoCopy signals to the chunker that it should track fileinfo for
	// filestore adds
	NoCopy bool
}

DagBuilderParams wraps configuration options to create a DagBuilderHelper from a chunker.Splitter.

func (*DagBuilderParams) New 

func (dbp *DagBuilderParams) New(spl chunker.Splitter) (*DagBuilderHelper, error)

New generates a new DagBuilderHelper from the given params and a given chunker.Splitter as data source.

type FSNodeOverDag 

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

FSNodeOverDag encapsulates an `unixfs.FSNode` that will be stored in a `dag.ProtoNode`. Instead of just having a single `ipld.Node` that would need to be constantly (un)packed to access and modify its internal `FSNode` in the process of creating a UnixFS DAG, this structure stores an `FSNode` cache to manipulate it (add child nodes) directly , and only when the node has reached its final (immutable) state (signaled by calling `Commit()`) is it committed to a single (indivisible) `ipld.Node`.

It is used mainly for internal (non-leaf) nodes, and for some representations of data leaf nodes (that don't use raw nodes or Filestore).

It aims to replace the `UnixfsNode` structure which encapsulated too many possible node state combinations.

TODO: Revisit the name.

func NewFSNFromDag 

func NewFSNFromDag(nd *dag.ProtoNode) (*FSNodeOverDag, error)

NewFSNFromDag reconstructs a FSNodeOverDag node from a given dag node

func (*FSNodeOverDag) AddChild 

func (n *FSNodeOverDag) AddChild(child ipld.Node, fileSize uint64, db *DagBuilderHelper) error

AddChild adds a `child` `ipld.Node` to both node layers. The `dag.ProtoNode` creates a link to the child node while the `ft.FSNode` stores its file size (that is, not the size of the node but the size of the file data that it is storing at the UnixFS layer). The child is also stored in the `DAGService`.

func (*FSNodeOverDag) Commit 

func (n *FSNodeOverDag) Commit() (ipld.Node, error)

Commit unifies (resolves) the cache nodes into a single `ipld.Node` that represents them: the `ft.FSNode` is encoded inside the `dag.ProtoNode`.

TODO: Make it read-only after committing, allow to commit only once.

func (*FSNodeOverDag) FileSize 

func (n *FSNodeOverDag) FileSize() uint64

FileSize returns the `Filesize` attribute from the underlying representation of the `ft.FSNode`.

func (*FSNodeOverDag) GetChild 

func (n *FSNodeOverDag) GetChild(ctx context.Context, i int, ds ipld.DAGService) (*FSNodeOverDag, error)

GetChild gets the ith child of this node from the given DAGService.

func (*FSNodeOverDag) GetDagNode 

func (n *FSNodeOverDag) GetDagNode() (ipld.Node, error)

GetDagNode fills out the proper formatting for the FSNodeOverDag node inside of a DAG node and returns the dag node. TODO: Check if we have committed (passed the UnixFS information to the DAG layer) before returning this.

func (*FSNodeOverDag) ModTime added in v0.23.0 

func (n *FSNodeOverDag) ModTime() time.Time

ModTime returns the last modification time of the associated `ft.FSNode`

func (*FSNodeOverDag) Mode added in v0.23.0 

func (n *FSNodeOverDag) Mode() os.FileMode

Mode returns the file mode of the associated `ft.FSNode`

func (*FSNodeOverDag) NumChildren 

func (n *FSNodeOverDag) NumChildren() int

NumChildren returns the number of children of the `ft.FSNode`.

func (*FSNodeOverDag) RemoveChild 

func (n *FSNodeOverDag) RemoveChild(index int, dbh *DagBuilderHelper)

RemoveChild deletes the child node at the given index.

func (*FSNodeOverDag) SetFileData 

func (n *FSNodeOverDag) SetFileData(fileData []byte)

SetFileData stores the `fileData` in the `ft.FSNode`. It should be used only when `FSNodeOverDag` represents a leaf node (internal nodes don't carry data, just file sizes).

func (*FSNodeOverDag) SetModTime added in v0.23.0 

func (n *FSNodeOverDag) SetModTime(ts time.Time)

SetModTime sets the file modification time of the associated `ft.FSNode`.

func (*FSNodeOverDag) SetMode added in v0.23.0 

func (n *FSNodeOverDag) SetMode(mode os.FileMode)

SetMode sets the file mode of the associated `ft.FSNode`.

Source Files

View all Source files

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.