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 Go to latest Published: Dec 30, 2017 License: Apache-2.0 Imports: 40 Imported by: 346

Documentation

Overview

Package index provides a generic indexing system on top of the abstract Storage interface.

The following keys & values are populated by receiving blobs and queried for search operations:

  • Recent Permanodes "recpn|<pgp-keyid>|<reverse-modtime>|<claim-blobref>" -> "<permanode-blobref>" where reverse-modtime flips each digit to '9'-<digit> and prepends "rt" (for reverse time) "2011-11-27T01:23:45Z" = "rt7988-88-72T98:76:54Z"

  • signer blobref of ascii public key -> gpg key id "signerkeyid:sha1-ad87ca5c78bd0ce1195c46f7c98e6025abbaf007" = "2931A67C26F5ABDA"

  • PermanodeOfSignerAttrValue: "signerattrvalue|<keyid>|<URLEscape(attr)>|<URLEscape(value)>|<reverse-claimtime>|<claim-blobref>" -> "<permanode>" e.g. "signerattrvalue|2931A67C26F5ABDA|camliRoot|rootval|"+ "rt7988-88-71T98:67:60.999876543Z|sha1-bf115940641f1aae2e007edcf36b3b18c17256d9" = "sha1-7a14cce982aa73ab519e63050f82e2a2adfcf039"

  • Other: "meta:<blobref>" -> "<size>|<mimetype>" "have:<blobref>" -> "<size>" (used for enumeration, which doesn't need mime type)

  • For GetOwnerClaims(permanode, signer): "claim|<permanode-blobref>|<keyid>|<date>|<claim-blobref>" -> "<URL:type>|<URL:attr>|<URL:value>"

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func ClaimsAttrValue 

func ClaimsAttrValue(claims []camtypes.Claim, attr string, at time.Time, signerFilter blob.Ref) string

ClaimsAttrValue returns the value of attr from claims, or the empty string if not found. Claims should be sorted by claim.Date.

func IsBlobReferenceAttribute 

func IsBlobReferenceAttribute(attr string) bool

IsBlobReferenceAttribute returns whether attr is an attribute whose value is a blob reference (e.g. camliMember) and thus something the indexers should keep inverted indexes on for parent/child-type relationships.

func IsFulltextAttribute 

func IsFulltextAttribute(attr string) bool

func IsIndexedAttribute 

func IsIndexedAttribute(attr string) bool

TODO(bradfitz): rename this? This is really about signer-attr-value (PermanodeOfSignerAttrValue), and not about indexed attributes in general.

func ReindexMaxProcs 

func ReindexMaxProcs() int

ReindexMaxProcs returns the maximum number of concurrent goroutines that are used during reindexing.

func SetReindexMaxProcs 

func SetReindexMaxProcs(n int)

SetReindexMaxProcs sets the maximum number of concurrent goroutines that are used during reindexing.

func SetVerboseCorpusLogging 

func SetVerboseCorpusLogging(v bool)

SetVerboseCorpusLogging controls corpus setup verbosity. It's on by default but used to disable verbose logging in tests.

Types

type BlobSniffer 

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

func NewBlobSniffer 

func NewBlobSniffer(ref blob.Ref) *BlobSniffer

func (*BlobSniffer) Body 

func (sn *BlobSniffer) Body() ([]byte, error)

Body returns the bytes written to the BlobSniffer.

func (*BlobSniffer) CamliType 

func (sn *BlobSniffer) CamliType() string

func (*BlobSniffer) IsTruncated 

func (sn *BlobSniffer) IsTruncated() bool

IsTruncated reports whether the BlobSniffer had more than schema.MaxSchemaBlobSize bytes written to it.

func (*BlobSniffer) MIMEType 

func (sn *BlobSniffer) MIMEType() string

MIMEType returns the sniffed blob's content-type or the empty string if unknown. If the blob is a Camlistore schema metadata blob, the MIME type will be of the form "application/json; camliType=foo".

func (*BlobSniffer) Parse 

func (sn *BlobSniffer) Parse()

func (*BlobSniffer) SchemaBlob 

func (sn *BlobSniffer) SchemaBlob() (meta *schema.Blob, ok bool)

func (*BlobSniffer) Size 

func (sn *BlobSniffer) Size() int64

Size returns the number of bytes written to the BlobSniffer. It might be more than schema.MaxSchemaBlobSize. See IsTruncated.

func (*BlobSniffer) Write 

func (sn *BlobSniffer) Write(d []byte) (int, error)

type Corpus 

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

Corpus is an in-memory summary of all of a user's blobs' metadata.

A Corpus is not safe for concurrent use. Callers should use Lock or RLock on the parent index instead.

func NewCorpusFromStorage 

func NewCorpusFromStorage(s sorted.KeyValue) (*Corpus, error)

func (*Corpus) AppendClaims 

func (c *Corpus) AppendClaims(ctx context.Context, dst []camtypes.Claim, permaNode blob.Ref,
	signerFilter blob.Ref,
	attrFilter string) ([]camtypes.Claim, error)

func (*Corpus) AppendPermanodeAttrValues 

func (c *Corpus) AppendPermanodeAttrValues(dst []string,
	permaNode blob.Ref,
	attr string,
	at time.Time,
	signerFilter blob.Ref) []string

AppendPermanodeAttrValues appends to dst all the values for the attribute attr set on permaNode. signerFilter is optional. dst must start with length 0 (laziness, mostly)

func (*Corpus) EnumerateBlobMeta 

func (c *Corpus) EnumerateBlobMeta(fn func(camtypes.BlobMeta) bool)

EnumerateBlobMeta calls fn for all known meta blobs in an undefined order. If fn returns false, iteration ends.

func (*Corpus) EnumerateCamliBlobs 

func (c *Corpus) EnumerateCamliBlobs(camType string, fn func(camtypes.BlobMeta) bool)

EnumerateCamliBlobs calls fn for all known meta blobs.

If camType is not empty, it specifies a filter for which meta blob types to call fn for. If empty, all are emitted.

If fn returns false, iteration ends.

func (*Corpus) EnumeratePermanodesCreated 

func (c *Corpus) EnumeratePermanodesCreated(fn func(camtypes.BlobMeta) bool, newestFirst bool)

EnumeratePermanodesCreated calls fn for all permanodes. They are sorted using the contents creation date if any, the permanode modtime otherwise, and in the order specified by newestFirst. Iteration ends prematurely if fn returns false.

func (*Corpus) EnumeratePermanodesLastModified 

func (c *Corpus) EnumeratePermanodesLastModified(fn func(camtypes.BlobMeta) bool)

EnumeratePermanodesLastModified calls fn for all permanodes, sorted by most recently modified first. Iteration ends prematurely if fn returns false.

func (*Corpus) FileLatLong 

func (c *Corpus) FileLatLong(fileRef blob.Ref) (lat, long float64, ok bool)

func (*Corpus) ForeachClaim 

func (c *Corpus) ForeachClaim(permaNode blob.Ref, at time.Time, fn func(*camtypes.Claim) bool)

ForeachClaim calls fn for each claim of permaNode. If at is zero, all claims are yielded. If at is non-zero, claims after that point are skipped. If fn returns false, iteration ends. Iteration is in an undefined order.

func (*Corpus) ForeachClaimBack 

func (c *Corpus) ForeachClaimBack(value blob.Ref, at time.Time, fn func(*camtypes.Claim) bool)

ForeachClaimBack calls fn for each claim with a value referencing br. If at is zero, all claims are yielded. If at is non-zero, claims after that point are skipped. If fn returns false, iteration ends. Iteration is in an undefined order.

func (*Corpus) GetBlobMeta 

func (c *Corpus) GetBlobMeta(ctx context.Context, br blob.Ref) (camtypes.BlobMeta, error)

func (*Corpus) GetFileInfo 

func (c *Corpus) GetFileInfo(ctx context.Context, fileRef blob.Ref) (fi camtypes.FileInfo, err error)

func (*Corpus) GetImageInfo 

func (c *Corpus) GetImageInfo(ctx context.Context, fileRef blob.Ref) (ii camtypes.ImageInfo, err error)

func (*Corpus) GetMediaTags 

func (c *Corpus) GetMediaTags(ctx context.Context, fileRef blob.Ref) (map[string]string, error)

func (*Corpus) GetWholeRef 

func (c *Corpus) GetWholeRef(ctx context.Context, fileRef blob.Ref) (wholeRef blob.Ref, ok bool)

func (*Corpus) IsDeleted 

func (c *Corpus) IsDeleted(br blob.Ref) bool

IsDeleted reports whether the provided blobref (of a permanode or claim) should be considered deleted.

func (*Corpus) KeyId 

func (c *Corpus) KeyId(ctx context.Context, signer blob.Ref) (string, error)

func (*Corpus) PermanodeAnyTime 

func (c *Corpus) PermanodeAnyTime(pn blob.Ref) (t time.Time, ok bool)

PermanodeAnyTime returns the time that best qualifies the permanode. It tries content-specific times first, the permanode modtime otherwise.

func (*Corpus) PermanodeAttrValue 

func (c *Corpus) PermanodeAttrValue(permaNode blob.Ref,
	attr string,
	at time.Time,
	signerFilter blob.Ref) string

PermanodeAttrValue returns a single-valued attribute or "".

func (*Corpus) PermanodeHasAttrValue 

func (c *Corpus) PermanodeHasAttrValue(pn blob.Ref, at time.Time, attr, val string) bool

PermanodeHasAttrValue reports whether the permanode pn at time at (zero means now) has the given attribute with the given value. If the attribute is multi-valued, any may match.

func (*Corpus) PermanodeModtime 

func (c *Corpus) PermanodeModtime(pn blob.Ref) (t time.Time, ok bool)

PermanodeModtime returns the latest modification time of the given permanode.

The ok value is true only if the permanode is known and has any non-deleted claims. A deleted claim is ignored and neither its claim date nor the date of the delete claim affect the modtime of the permanode.

func (*Corpus) PermanodeTime 

func (c *Corpus) PermanodeTime(pn blob.Ref) (t time.Time, ok bool)

PermanodeTime returns the time of the content in permanode.

type Index 

type Index struct {
	*blobserver.NoImplStorage

	KeyFetcher blob.Fetcher // for verifying claims
	// contains filtered or unexported fields
}

func New 

func New(s sorted.KeyValue) (*Index, error)

New returns a new index using the provided key/value storage implementation.

func NewMemoryIndex 

func NewMemoryIndex() *Index

NewMemoryIndex returns an Index backed only by memory, for use in tests.

func (*Index) AppendClaims 

func (x *Index) AppendClaims(ctx context.Context, dst []camtypes.Claim, permaNode blob.Ref,
	signerFilter blob.Ref,
	attrFilter string) ([]camtypes.Claim, error)

func (*Index) Close 

func (x *Index) Close() error

Close closes the underlying sorted.KeyValue, if the storage has a Close method. The return value is the return value of the underlying Close, or nil otherwise.

func (*Index) DisableOutOfOrderIndexing 

func (ix *Index) DisableOutOfOrderIndexing()

DisableOutOfOrderIndexing should only be used for tests. It disables the asynchronous, out of order, indexing to demonstrate that e.g. reindexing fails without it.

func (*Index) EdgesTo 

func (x *Index) EdgesTo(ref blob.Ref, opts *camtypes.EdgesToOpts) (edges []*camtypes.Edge, err error)

func (*Index) EnumerateBlobMeta 

func (x *Index) EnumerateBlobMeta(ctx context.Context, fn func(camtypes.BlobMeta) bool) error

EnumerateBlobMeta calls fn for all known meta blobs. If fn returns false, iteration stops and an nil error is returned. If ctx becomes done, iteration stops and ctx.Err() is returned.

func (*Index) EnumerateBlobs 

func (ix *Index) EnumerateBlobs(ctx context.Context, dest chan<- blob.SizedRef, after string, limit int) (err error)

func (*Index) ExistingFileSchemas 

func (x *Index) ExistingFileSchemas(wholeRef blob.Ref) (schemaRefs []blob.Ref, err error)

func (*Index) GetBlobMeta 

func (x *Index) GetBlobMeta(ctx context.Context, br blob.Ref) (camtypes.BlobMeta, error)

func (*Index) GetDirMembers 

func (x *Index) GetDirMembers(dir blob.Ref, dest chan<- blob.Ref, limit int) (err error)

GetDirMembers sends on dest the children of the static directory dir.

func (*Index) GetFileInfo 

func (x *Index) GetFileInfo(ctx context.Context, fileRef blob.Ref) (camtypes.FileInfo, error)

func (*Index) GetFileLocation 

func (x *Index) GetFileLocation(ctx context.Context, fileRef blob.Ref) (camtypes.Location, error)

func (*Index) GetImageInfo 

func (x *Index) GetImageInfo(ctx context.Context, fileRef blob.Ref) (camtypes.ImageInfo, error)

func (*Index) GetMediaTags 

func (x *Index) GetMediaTags(ctx context.Context, fileRef blob.Ref) (tags map[string]string, err error)

func (*Index) GetRecentPermanodes 

func (x *Index) GetRecentPermanodes(ctx context.Context, dest chan<- camtypes.RecentPermanode, owner blob.Ref, limit int, before time.Time) (err error)

GetRecentPermanodes sends results to dest filtered by owner, limit, and before. A zero value for before will default to the current time. The results will have duplicates suppressed, with most recent permanode returned. Note, permanodes more recent than before will still be fetched from the index then skipped. This means runtime scales linearly with the number of nodes more recent than before.

func (*Index) InitBlobSource 

func (x *Index) InitBlobSource(blobSource blobserver.FetcherEnumerator)

InitBlobSource sets the index's blob source and starts the background out-of-order indexing loop. It panics if the blobSource is already set. If the index's key fetcher is nil, it is also set to the blobSource argument.

func (*Index) IsDeleted 

func (x *Index) IsDeleted(br blob.Ref) bool

IsDeleted reports whether the provided blobref (of a permanode or claim) should be considered deleted.

func (*Index) KeepInMemory 

func (x *Index) KeepInMemory() (*Corpus, error)

func (*Index) KeyId 

func (x *Index) KeyId(ctx context.Context, signer blob.Ref) (string, error)

func (*Index) Lock 

func (x *Index) Lock()

func (*Index) PathLookup 

func (x *Index) PathLookup(ctx context.Context, signer, base blob.Ref, suffix string, at time.Time) (*camtypes.Path, error)

func (*Index) PathsLookup 

func (x *Index) PathsLookup(ctx context.Context, signer, base blob.Ref, suffix string) (paths []*camtypes.Path, err error)

func (*Index) PathsOfSignerTarget 

func (x *Index) PathsOfSignerTarget(ctx context.Context, signer, target blob.Ref) (paths []*camtypes.Path, err error)

func (*Index) PermanodeOfSignerAttrValue 

func (x *Index) PermanodeOfSignerAttrValue(ctx context.Context, signer blob.Ref, attr, val string) (permaNode blob.Ref, err error)

func (*Index) PreventStorageAccessForTesting 

func (x *Index) PreventStorageAccessForTesting()

PreventStorageAccessForTesting causes any access to the index's underlying Storage interface to panic.

func (*Index) RLock 

func (x *Index) RLock()

func (*Index) RUnlock 

func (x *Index) RUnlock()

func (*Index) ReceiveBlob 

func (ix *Index) ReceiveBlob(blobRef blob.Ref, source io.Reader) (blob.SizedRef, error)

func (*Index) Reindex 

func (x *Index) Reindex() error

func (*Index) SearchPermanodesWithAttr 

func (x *Index) SearchPermanodesWithAttr(ctx context.Context, dest chan<- blob.Ref, request *camtypes.PermanodeByAttrRequest) (err error)

This is just like PermanodeOfSignerAttrValue except we return multiple and dup-suppress. If request.Query is "", it is not used in the prefix search.

func (*Index) StatBlobs 

func (ix *Index) StatBlobs(dest chan<- blob.SizedRef, blobs []blob.Ref) error

func (*Index) Storage 

func (x *Index) Storage() sorted.KeyValue

Storage returns the index's underlying Storage implementation.

func (*Index) String 

func (x *Index) String() string

func (*Index) Unlock 

func (x *Index) Unlock()

type Interface 

type Interface interface {
	sync.Locker
	RLock()
	RUnlock()

	// os.ErrNotExist should be returned if the blob isn't known
	GetBlobMeta(context.Context, blob.Ref) (camtypes.BlobMeta, error)

	// Should return os.ErrNotExist if not found.
	GetFileInfo(ctx context.Context, fileRef blob.Ref) (camtypes.FileInfo, error)

	// Should return os.ErrNotExist if not found.
	GetImageInfo(ctx context.Context, fileRef blob.Ref) (camtypes.ImageInfo, error)

	// Should return os.ErrNotExist if not found.
	GetMediaTags(ctx context.Context, fileRef blob.Ref) (map[string]string, error)

	// GetFileLocation returns the location info (currently Exif) of the fileRef.
	// Should return os.ErrNotExist if fileRef is not found,
	// is not a file, or it has no location info.
	GetFileLocation(ctx context.Context, fileRef blob.Ref) (camtypes.Location, error)

	// KeyId returns the GPG keyid (e.g. "2931A67C26F5ABDA)
	// given the blobref of its ASCII-armored blobref.
	// The error is ErrNotFound if not found.
	KeyId(context.Context, blob.Ref) (string, error)

	// AppendClaims appends to dst claims on the given permanode.
	// The signerFilter and attrFilter are both optional.  If non-zero,
	// they filter the return items to only claims made by the given signer
	// or claims about the given attribute, respectively.
	// Deleted claims are never returned.
	// The items may be appended in any order.
	//
	// TODO: this should take a context and a callback func
	// instead of a dst, then it can append to a channel instead,
	// and the context lets it be interrupted. The callback should
	// take the context too, so the channel send's select can read
	// from the Done channel.
	AppendClaims(ctx context.Context, dst []camtypes.Claim, permaNode blob.Ref,
		signerFilter blob.Ref,
		attrFilter string) ([]camtypes.Claim, error)

	// dest must be closed, even when returning an error.
	// limit <= 0 means unlimited.
	GetRecentPermanodes(ctx context.Context, dest chan<- camtypes.RecentPermanode,
		owner blob.Ref,
		limit int,
		before time.Time) error

	// SearchPermanodes finds permanodes matching the provided
	// request and sends unique permanode blobrefs to dest.
	// In particular, if request.FuzzyMatch is true, a fulltext
	// search is performed (if supported by the attribute(s))
	// instead of an exact match search.
	// If request.Query is blank, the permanodes which have
	// request.Attribute as an attribute (regardless of its value)
	// are searched.
	// Additionally, if request.Attribute is blank, all attributes
	// are searched (as fulltext), otherwise the search is
	// restricted  to the named attribute.
	//
	// dest is always closed, regardless of the error return value.
	SearchPermanodesWithAttr(ctx context.Context, dest chan<- blob.Ref,
		request *camtypes.PermanodeByAttrRequest) error

	// ExistingFileSchemas returns 0 or more blobrefs of "bytes"
	// (TODO(bradfitz): or file?) schema blobs that represent the
	// bytes of a file given in bytesRef.  The file schema blobs
	// returned are not guaranteed to reference chunks that still
	// exist on the blobservers, though.  It's purely a hint for
	// clients to avoid uploads if possible.  Before re-using any
	// returned blobref they should be checked.
	//
	// Use case: a user drag & drops a large file onto their
	// browser to upload.  (imagine that "large" means anything
	// larger than a blobserver's max blob size) JavaScript can
	// first SHA-1 the large file locally, then send the
	// wholeFileRef to this call and see if they'd previously
	// uploaded the same file in the past.  If so, the upload
	// can be avoided if at least one of the returned schemaRefs
	// can be validated (with a validating HEAD request) to still
	// all exist on the blob server.
	ExistingFileSchemas(wholeFileRef blob.Ref) (schemaRefs []blob.Ref, err error)

	// GetDirMembers sends on dest the children of the static
	// directory dirRef. It returns os.ErrNotExist if dirRef
	// is nil.
	// dest must be closed, even when returning an error.
	// limit <= 0 means unlimited.
	GetDirMembers(dirRef blob.Ref, dest chan<- blob.Ref, limit int) error

	// Given an owner key, a camliType 'claim', 'attribute' name,
	// and specific 'value', find the most recent permanode that has
	// a corresponding 'set-attribute' claim attached.
	// Returns os.ErrNotExist if none is found.
	// Only attributes white-listed by IsIndexedAttribute are valid.
	// TODO(bradfitz): ErrNotExist here is a weird error message ("file" not found). change.
	// TODO(bradfitz): use keyId instead of signer?
	PermanodeOfSignerAttrValue(ctx context.Context, signer blob.Ref, attr, val string) (blob.Ref, error)

	// PathsOfSignerTarget queries the index about "camliPath:"
	// URL-dispatch attributes.
	//
	// It returns a list of all the path claims that have been signed
	// by the provided signer and point at the given target.
	//
	// This is used when editing a permanode, to figure work up
	// the name resolution tree backwards ultimately to a
	// camliRoot permanode (which should know its base URL), and
	// then the complete URL(s) of a target can be found.
	PathsOfSignerTarget(ctx context.Context, signer, target blob.Ref) ([]*camtypes.Path, error)

	// All Path claims for (signer, base, suffix)
	PathsLookup(ctx context.Context, signer, base blob.Ref, suffix string) ([]*camtypes.Path, error)

	// Most recent Path claim for (signer, base, suffix) as of
	// provided time 'at', or most recent if 'at' is nil.
	PathLookup(ctx context.Context, signer, base blob.Ref, suffix string, at time.Time) (*camtypes.Path, error)

	// EdgesTo finds references to the provided ref.
	//
	// For instance, if ref is a permanode, it might find the parent permanodes
	// that have ref as a member.
	// Or, if ref is a static file, it might find static directories which contain
	// that file.
	// This is a way to go "up" or "back" in a hierarchy.
	//
	// opts may be nil to accept the defaults.
	EdgesTo(ref blob.Ref, opts *camtypes.EdgesToOpts) ([]*camtypes.Edge, error)

	// EnumerateBlobMeta calls fn for each blob known to the
	// indexer (which may be a subset of all total blobs, since
	// the indexer is typically configured to not see non-metadata
	// blobs). The blobs may be sent in any order.  If the context
	// finishes, the return error is ctx.Err().
	// If the provided function returns false, iteration ends with a nil
	// return value.
	EnumerateBlobMeta(context.Context, func(camtypes.BlobMeta) bool) error
}

type LocationHelper 

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

LocationHelper queries permanode locations.

A LocationHelper is not safe for concurrent use. Callers should use Lock or RLock on the underlying index instead.

func NewLocationHelper 

func NewLocationHelper(ix *Index) *LocationHelper

NewLocationHelper returns a new location handler that uses ix to query blob attributes.

func (*LocationHelper) PermanodeLocation 

func (lh *LocationHelper) PermanodeLocation(ctx context.Context, permaNode blob.Ref,
	at time.Time, signer blob.Ref) (camtypes.Location, error)

PermanodeLocation returns the location info for a permanode, from one of the following sources:

  1. Permanode attributes "latitude" and "longitude"
  2. Referenced permanode attributes (eg. for "foursquare.com:checkin" its "foursquareVenuePermanode")
  3. Location in permanode camliContent file metadata

The sources are checked in this order, the location from the first source yielding a valid result is returned.

func (*LocationHelper) SetCorpus 

func (lh *LocationHelper) SetCorpus(corpus *Corpus)

SetCorpus sets the corpus to be used for location lookups.

type PermanodeMeta 

type PermanodeMeta struct {
	Claims []*camtypes.Claim // sorted by camtypes.ClaimsByDate
	// contains filtered or unexported fields
}

Source Files

View all Source files

Directories

Path Synopsis
Package indextest contains the unit tests for the indexer so they can be re-used for each specific implementation of the index Storage interface.
 Package indextest contains the unit tests for the indexer so they can be re-used for each specific implementation of the index Storage interface.
Package sqlindex implements the sorted.KeyValue interface using an *sql.DB.
 Package sqlindex implements the sorted.KeyValue interface using an *sql.DB.

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