search

package
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 Go to latest Published: Jan 17, 2014 License: Apache-2.0 Imports: 30 Imported by: 0

Documentation

Overview

Package search describes and answers Camlistore search queries.

Many of the search methods or functions provide results that are ordered by modification time, or at least depend on modification times. In that context, (un)deletions (of permanodes, or attributes) are not considered modifications and therefore the time at which they occured does not affect the result.

Index

Constants

View Source 
const MaxImageSize = 2000

MaxImageSize is the maximum width or height in pixels that we will serve image thumbnails at. It is used in the search result UI.

Variables

This section is empty.

Functions

This section is empty.

Types

type ClaimConstraint 

type ClaimConstraint struct {
	SignedBy     string    `json:"signedBy"` // identity
	SignedAfter  time.Time `json:"signedAfter"`
	SignedBefore time.Time `json:"signedBefore"`
}

type ClaimsItem 

type ClaimsItem struct {
	BlobRef   blob.Ref       `json:"blobref"`
	Signer    blob.Ref       `json:"signer"`
	Permanode blob.Ref       `json:"permanode"`
	Date      types.Time3339 `json:"date"`
	Type      string         `json:"type"`
	Attr      string         `json:"attr,omitempty"`
	Value     string         `json:"value,omitempty"`
}

A ClaimsItem is an item returned from $searchRoot/camli/search/claims.

type ClaimsRequest 

type ClaimsRequest struct {
	Permanode blob.Ref
}

ClaimsRequest is a request to get a ClaimsResponse.

func (*ClaimsRequest) URLSuffix 

func (r *ClaimsRequest) URLSuffix() string

type ClaimsResponse 

type ClaimsResponse struct {
	Claims []*ClaimsItem `json:"claims"`
}

ClaimsResponse is the JSON response from $searchRoot/camli/search/claims.

type Constraint 

type Constraint struct {
	// If Logical is non-nil, all other fields are ignored.
	Logical *LogicalConstraint `json:"logical,omitempty"`

	// Anything, if true, matches all blobs.
	Anything bool `json:"anything,omitempty"`

	CamliType     string `json:"camliType,omitempty"`    // camliType of the JSON blob
	AnyCamliType  bool   `json:"anyCamliType,omitempty"` // if true, any camli JSON blob matches
	BlobRefPrefix string `json:"blobRefPrefix,omitempty"`

	File *FileConstraint `json:"file,omitempty"`
	Dir  *DirConstraint  `json:"dir,omitempty"`

	Claim    *ClaimConstraint `json:"claim,omitempty"`
	BlobSize *IntConstraint   `json:"blobSize,omitempty"`

	Permanode *PermanodeConstraint `json:"permanode,omitempty"`
	// contains filtered or unexported fields
}

Constraint specifies a blob matching constraint. A blob matches if it matches all non-zero fields' predicates. A zero constraint matches nothing.

type DescribeError 

type DescribeError map[string]error

func (DescribeError) Error 

func (de DescribeError) Error() string

type DescribeRequest 

type DescribeRequest struct {
	// BlobRefs are the blobs to describe. If length zero, BlobRef
	// is used.
	BlobRefs []blob.Ref `json:"blobrefs,omitempty"`

	// BlobRef is the blob to describe.
	BlobRef blob.Ref `json:"blobref,omitempty"`

	// Depth is the optional traversal depth to describe from the
	// root BlobRef. If zero, a default is used.
	Depth int `json:"depth,omitempty"`
	// MaxDirChildren is the requested optional limit to the number
	// of children that should be fetched when describing a static
	// directory. If zero, a default is used.
	MaxDirChildren int `json:"maxDirChildren,omitempty"`

	// At specifies the time which we wish to see the state of
	// this blob.  If zero (unspecified), all claims will be
	// considered, otherwise, any claims after this date will not
	// be considered.
	At types.Time3339 `json:"at"`

	// ThumbnailSize sets the max dimension for the thumbnail ULR generated,
	// or zero for none
	ThumbnailSize int `json:"thumbnailSize,omitempty"`
	// contains filtered or unexported fields
}

func (*DescribeRequest) Describe 

func (dr *DescribeRequest) Describe(br blob.Ref, depth int)

Describe starts a lookup of br, down to the provided depth. It returns immediately.

func (*DescribeRequest) DescribeSync 

func (dr *DescribeRequest) DescribeSync(br blob.Ref) (*DescribedBlob, error)

func (*DescribeRequest) DescribedBlobStr 

func (dr *DescribeRequest) DescribedBlobStr(blobstr string) *DescribedBlob

Given a blobref string returns a Description or nil. dr may be nil itself.

func (*DescribeRequest) Result 

func (dr *DescribeRequest) Result() (desmap map[string]*DescribedBlob, err error)

Result waits for all outstanding lookups to complete and returns the map of blobref (strings) to their described results. The returned error is non-nil if any errors occured, and will be of type DescribeError.

func (*DescribeRequest) URLSuffix 

func (r *DescribeRequest) URLSuffix() string

type DescribeResponse 

type DescribeResponse struct {
	Meta MetaMap `json:"meta"`
}

DescribeResponse is the JSON response from $searchRoot/camli/search/describe.

type DescribedBlob 

type DescribedBlob struct {
	Request *DescribeRequest `json:"-"`

	BlobRef   blob.Ref `json:"blobRef"`
	CamliType string   `json:"camliType,omitempty"`
	Size      int64    `json:"size,"`

	// if camliType "permanode"
	Permanode *DescribedPermanode `json:"permanode,omitempty"`

	// if camliType "file"
	File *camtypes.FileInfo `json:"file,omitempty"`
	// if camliType "directory"
	Dir *camtypes.FileInfo `json:"dir,omitempty"`
	// if camliType "file", and File.IsImage()
	Image *camtypes.ImageInfo `json:"image,omitempty"`
	// if camliType "directory"
	DirChildren []blob.Ref `json:"dirChildren,omitempty"`

	Thumbnail       string `json:"thumbnailSrc,omitempty"`
	ThumbnailWidth  int    `json:"thumbnailWidth,omitempty"`
	ThumbnailHeight int    `json:"thumbnailHeight,omitempty"`

	// Stub is set if this is not loaded, but referenced.
	Stub bool `json:"-"`
}

func (*DescribedBlob) ContentRef 

func (b *DescribedBlob) ContentRef() (br blob.Ref, ok bool)

func (*DescribedBlob) Description 

func (b *DescribedBlob) Description() string

func (*DescribedBlob) DirMembers 

func (b *DescribedBlob) DirMembers() []*DescribedBlob

func (*DescribedBlob) DomID 

func (b *DescribedBlob) DomID() string

func (*DescribedBlob) HasSecureLinkTo 

func (b *DescribedBlob) HasSecureLinkTo(other blob.Ref) bool

HasSecureLinkTo returns true if there's a valid link from this blob to the other blob. This is used in access control (hence the somewhat redundant "Secure" in the name) and should be paranoid against e.g. random user/attacker-control attributes making links to other blobs.

TODO: don't linear scan here. rewrite this in terms of ResolvePrefixHop, passing down some policy perhaps? or maybe that's enough.

func (*DescribedBlob) Members 

func (b *DescribedBlob) Members() []*DescribedBlob

Members returns all of b's children, as given by b's camliMember and camliPath:* attributes. Only the first entry for a given camliPath attribute is used.

func (*DescribedBlob) PeerBlob 

func (b *DescribedBlob) PeerBlob(br blob.Ref) *DescribedBlob

PeerBlob returns a DescribedBlob for the provided blobref.

Unlike DescribedBlobStr, the returned DescribedBlob is never nil.

If the blob was never loaded along with the the receiver (or if the receiver is nil), a stub DescribedBlob is returned with its Stub field set true.

func (*DescribedBlob) PermanodeDir 

func (b *DescribedBlob) PermanodeDir() (path []blob.Ref, fi *camtypes.FileInfo, ok bool)

PermanodeDir returns in path the blobref of the described permanode and the blobref of its Directory camliContent. If b isn't a permanode, or doesn't have a camliContent that is a directory blob, ok is false.

func (*DescribedBlob) PermanodeFile 

func (b *DescribedBlob) PermanodeFile() (path []blob.Ref, fi *camtypes.FileInfo, ok bool)

PermanodeFile returns in path the blobref of the described permanode and the blobref of its File camliContent. If b isn't a permanode, or doesn't have a camliContent that is a file blob, ok is false.

func (*DescribedBlob) Title 

func (b *DescribedBlob) Title() string

type DescribedPermanode 

type DescribedPermanode struct {
	Attr    url.Values `json:"attr"` // a map[string][]string
	ModTime time.Time  `json:"modtime,omitempty"`
}

func (*DescribedPermanode) IsContainer 

func (dp *DescribedPermanode) IsContainer() bool

IsContainer returns whether the permanode has either named ("camliPath:"-prefixed) or unnamed ("camliMember") member attributes.

type DirConstraint 

type DirConstraint struct {
	FileName *StringConstraint

	TopFileSize,
	TopFileCount,
	FileSize,
	FileCount *IntConstraint
}

type EXIFConstraint 

type EXIFConstraint struct {
}

type EdgeItem 

type EdgeItem struct {
	From     blob.Ref `json:"from"`
	FromType string   `json:"fromType"`
}

An EdgeItem is an item returned from $searchRoot/camli/search/edgesto.

type EdgesRequest 

type EdgesRequest struct {
	// The blob we want to find as a reference.
	ToRef blob.Ref
}

EdgesRequest is a request to get an EdgesResponse.

type EdgesResponse 

type EdgesResponse struct {
	ToRef   blob.Ref    `json:"toRef"`
	EdgesTo []*EdgeItem `json:"edgesTo"`
}

EdgesResponse is the JSON response from $searchRoot/camli/search/edgesto.

type FileConstraint 

type FileConstraint struct {
	FileSize *IntConstraint `json:"fileSize,omitempty"`
	FileName *StringConstraint
	MIMEType *StringConstraint
	Time     *TimeConstraint
	ModTime  *TimeConstraint

	// For images:
	IsImage  bool                `json:"isImage,omitempty"`
	EXIF     *EXIFConstraint     `json:"exif,omitempty"` // TODO: implement
	Width    *IntConstraint      `json:"width,omitempty"`
	Height   *IntConstraint      `json:"height,omitempty"`
	WHRatio  *FloatConstraint    `json:"widthHeightRation,omitempty"`
	Location *LocationConstraint `json:"location,omitempty"`
}

type FloatConstraint 

type FloatConstraint struct {
	// Min and Max are both optional and inclusive bounds.
	// Zero means don't check.
	Min     float64 `json:"min,omitempty"`
	Max     float64 `json:"max,omitempty"`
	ZeroMin bool    `json:"zeroMin,omitempty"` // if true, min is actually zero
	ZeroMax bool    `json:"zeroMax,omitempty"` // if true, max is actually zero
}

A FloatConstraint specifies constraints on a float.

type Handler 

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

Handler handles search queries.

func NewHandler 

func NewHandler(index index.Interface, owner blob.Ref) *Handler

func (*Handler) Describe 

func (sh *Handler) Describe(dr *DescribeRequest) (*DescribeResponse, error)

func (*Handler) EdgesTo 

func (sh *Handler) EdgesTo(req *EdgesRequest) (*EdgesResponse, error)

EdgesTo returns edges that reference req.RefTo. It filters out since-deleted permanode edges.

func (*Handler) GetClaims 

func (sh *Handler) GetClaims(req *ClaimsRequest) (*ClaimsResponse, error)

GetClaims returns the claims on req.Permanode signed by sh.owner.

func (*Handler) GetPermanodesWithAttr 

func (sh *Handler) GetPermanodesWithAttr(req *WithAttrRequest) (*WithAttrResponse, error)

GetPermanodesWithAttr returns permanodes with attribute req.Attr having the req.Value as a value. See WithAttrRequest for more details about the query.

func (*Handler) GetRecentPermanodes 

func (sh *Handler) GetRecentPermanodes(req *RecentRequest) (*RecentResponse, error)

GetRecentPermanodes returns recently-modified permanodes.

func (*Handler) GetSignerPaths 

func (sh *Handler) GetSignerPaths(req *SignerPathsRequest) (*SignerPathsResponse, error)

GetSignerPaths returns paths with a target of req.Target.

func (*Handler) Index 

func (h *Handler) Index() index.Interface

func (*Handler) NewDescribeRequest 

func (sh *Handler) NewDescribeRequest() *DescribeRequest

NewDescribeRequest returns a new DescribeRequest holding the state of blobs and their summarized descriptions. Use DescribeBlob one or more times before calling Result.

func (*Handler) Owner 

func (h *Handler) Owner() blob.Ref

Owner returns Handler owner's public key blobref.

func (*Handler) Query 

func (h *Handler) Query(rawq *SearchQuery) (*SearchResult, error)

func (*Handler) ResolvePrefixHop 

func (sh *Handler) ResolvePrefixHop(parent blob.Ref, prefix string) (child blob.Ref, err error)

Given a blobref and a few hex characters of the digest of the next hop, return the complete blobref of the prefix, if that's a valid next hop.

func (*Handler) ServeHTTP 

func (sh *Handler) ServeHTTP(rw http.ResponseWriter, req *http.Request)

func (*Handler) SetCorpus 

func (h *Handler) SetCorpus(c *index.Corpus)

type IGetRecentPermanodes 

type IGetRecentPermanodes interface {
	// GetRecentPermanodes returns recently-modified permanodes.
	// This is a higher-level query returning more metadata than the index.GetRecentPermanodes,
	// which only scans the blobrefs but doesn't return anything about the permanodes.
	// TODO: rename this one?
	GetRecentPermanodes(*RecentRequest) (*RecentResponse, error)
}

IGetRecentPermanodes is the interface encapsulating the GetRecentPermanodes query.

type IntConstraint 

type IntConstraint struct {
	// Min and Max are both optional and inclusive bounds.
	// Zero means don't check.
	Min     int64 `json:"min,omitempty"`
	Max     int64 `json:"max,omitempty"`
	ZeroMin bool  `json:"zeroMin,omitempty"` // if true, min is actually zero
	ZeroMax bool  `json:"zeroMax,omitempty"` // if true, max is actually zero
}

An IntConstraint specifies constraints on an integer.

type LocationConstraint 

type LocationConstraint struct {
	// Any, if true, matches any photo with a known location.
	Any bool

	// North, West, East, and South define a region in which a photo
	// must be in order to match.
	North float64
	West  float64
	East  float64
	South float64
}

type LogicalConstraint 

type LogicalConstraint struct {
	Op string      `json:"op"` // "and", "or", "xor", "not"
	A  *Constraint `json:"a"`
	B  *Constraint `json:"b"` // only valid if Op != "not"
}

type MetaMap 

type MetaMap map[string]*DescribedBlob

A MetaMap is a map from blobref to a DescribedBlob.

func (MetaMap) Get 

func (m MetaMap) Get(br blob.Ref) *DescribedBlob

type PermanodeConstraint 

type PermanodeConstraint struct {
	// At specifies the time at which to pretend we're resolving attributes.
	// Attribute claims after this point in time are ignored.
	// If zero, the current time is used.
	At time.Time `json:"at,omitempty"`

	// ModTime optionally matches on the last modtime of the permanode.
	ModTime *TimeConstraint `json:"modTime,omitempty"`

	// Time optionally matches the permanode's time. A Permanode
	// may not have a known time. If the permanode does not have a
	// known time, one may be guessed if the top-level search
	// parameters request so.
	Time *TimeConstraint `json:"time,omitempty"`

	// Attr optionally specifies the attribute to match.
	// e.g. "camliContent", "camliMember", "tag"
	// This is required if any of the items below are used.
	Attr string `json:"attr,omitempty"`

	// SkipHidden skips hidden or other boring files.
	SkipHidden bool `json:"skipHidden,omitempty"`

	// NumValue optionally tests the number of values this
	// permanode has for Attr.
	NumValue *IntConstraint `json:"numValue,omitempty"`

	// ValueAll modifies the matching behavior when an attribute
	// is multi-valued.  By default, when ValueAll is false, only
	// one value of a multi-valued attribute needs to match. If
	// ValueAll is true, all attributes must match.
	ValueAll bool `json:"valueAllMatch,omitempty"`

	// Value specifies an exact string to match.
	// This is a convenience form for the simple case of exact
	// equality. The same can be accomplished with ValueMatches.
	Value string `json:"value,omitempty"` // if non-zero, absolute match

	// ValueMatches optionally specifies a StringConstraint to
	// match the value against.
	ValueMatches *StringConstraint `json:"valueMatches,omitempty"`

	// ValueMatchesInt optionally specifies an IntConstraint to match
	// the value against. Non-integer values will not match.
	ValueMatchesInt *IntConstraint `json:"valueMatchesInt,omitempty"`

	// ValueMatchesFloat optionally specifies a FloatConstraint to match
	// the value against. Non-float values will not match.
	ValueMatchesFloat *FloatConstraint `json:"valueMatchesFloat,omitempty"`

	// ValueInSet optionally specifies a sub-query which the value
	// (which must be a blobref) must be a part of.
	ValueInSet *Constraint `json:"valueInSet,omitempty"`

	// Relation optionally specifies a constraint based on relations
	// to other permanodes (e.g. camliMember or camliPath sets).
	// You can use it to test the properties of a parent, ancestor,
	// child, or progeny.
	Relation *RelationConstraint `json:"relation,omitempty"`

	// Continue is for internal use.
	Continue *PermanodeContinueConstraint `json:"-"`
}

PermanodeConstraint matches permanodes.

type PermanodeContinueConstraint 

type PermanodeContinueConstraint struct {
	// LastMod if non-zero is the modtime of the last item
	// that was seen. One of this or LastCreated will be set.
	LastMod time.Time

	// Last is the last blobref that was shown at the time
	// given in ModLessEqual or CreateLessEqual.
	// This is used as a tie-breaker.
	// If the time is equal, permanodes <= this are not matched.
	// If the time is past this in the scroll position, then this
	// field is ignored.
	Last blob.Ref
}

type RecentItem 

type RecentItem struct {
	BlobRef blob.Ref       `json:"blobref"`
	ModTime types.Time3339 `json:"modtime"`
	Owner   blob.Ref       `json:"owner"`
}

A RecentItem is an item returned from $searchRoot/camli/search/recent in the "recent" list.

type RecentRequest 

type RecentRequest struct {
	N             int       // if zero, default number of results
	Before        time.Time // if zero, now
	ThumbnailSize int       // if zero, no thumbnails
}

RecentRequest is a request to get a RecentResponse.

func (*RecentRequest) URLSuffix 

func (r *RecentRequest) URLSuffix() string

type RecentResponse 

type RecentResponse struct {
	Recent []*RecentItem `json:"recent"`
	Meta   MetaMap       `json:"meta"`

	Error     string `json:"error,omitempty"`
	ErrorType string `json:"errorType,omitempty"`
}

RecentResponse is the JSON response from $searchRoot/camli/search/recent.

func (*RecentResponse) Err 

func (r *RecentResponse) Err() error

type RelationConstraint 

type RelationConstraint struct {
	// Relation must be one of:
	//
	//   * "child"
	//   * "progeny" (any level down)
	//   * "parent" (immediate parent only)
	//   * "ancestor" (any level up)
	Relation string

	// EdgeType optionally specifies an edge type.
	// By default it matches "camliMember" and "camliPath:*".
	EdgeType string

	// After finding all the nodes matching the Relation and
	// EdgeType, either one or all (depending on whether Any or
	// All is set) must then match for the RelationConstraint
	// itself to match.
	//
	// It is an error to set both.
	Any, All *Constraint
}

type SearchQuery 

type SearchQuery struct {

	// Expression is a textual search query in minimal form,
	// e.g. "hawaii before:2008" or "tag:foo" or "foo" or "location:portland"
	// See expr.go and expr_test.go for all the operators.
	Expression string      `json:"expression,omitempty"`
	Constraint *Constraint `json:"constraint,omitempty"`

	Limit int      `json:"limit,omitempty"` // optional. default is automatic. negative means no limit.
	Sort  SortType `json:"sort,omitempty"`  // optional. default is automatic or unsorted.

	// Continue specifies the opaque token (as returned by a
	// SearchResult) for where to continue fetching results when
	// the Limit on a previous query was interrupted.
	// Continue is only valid for the same query (Expression or Constraint),
	// Limit, and Sort values.
	// If empty, the top-most query results are returned, as given
	// by Limit and Sort.
	Continue string `json:"continue,omitempty"`

	// If Describe is specified, the matched blobs are also described,
	// as if the Describe.BlobRefs field was populated.
	Describe *DescribeRequest `json:"describe,omitempty"`
}

func (*SearchQuery) URLSuffix 

func (q *SearchQuery) URLSuffix() string

type SearchResult 

type SearchResult struct {
	Blobs    []*SearchResultBlob `json:"blobs"`
	Describe *DescribeResponse   `json:"description"`

	// Continue optionally specifies the continuation token to to
	// continue fetching results in this result set, if interrupted
	// by a Limit.
	Continue string `json:"continue,omitempty"`
}

SearchResult is the result of the Search method for a given SearchQuery.

type SearchResultBlob 

type SearchResultBlob struct {
	Blob blob.Ref `json:"blob"`
}

func (*SearchResultBlob) String 

func (r *SearchResultBlob) String() string

type SignerAttrValueResponse 

type SignerAttrValueResponse struct {
	Permanode blob.Ref `json:"permanode"`
	Meta      MetaMap  `json:"meta"`
}

SignerAttrValueResponse is the JSON response to $search/camli/search/signerattrvalue

type SignerPathsItem 

type SignerPathsItem struct {
	ClaimRef blob.Ref `json:"claimRef"`
	BaseRef  blob.Ref `json:"baseRef"`
	Suffix   string   `json:"suffix"`
}

A SignerPathsItem is an item returned from $searchRoot/camli/search/signerpaths.

type SignerPathsRequest 

type SignerPathsRequest struct {
	Signer blob.Ref
	Target blob.Ref
}

SignerPathsRequest is a request to get a SignerPathsResponse.

type SignerPathsResponse 

type SignerPathsResponse struct {
	Paths []*SignerPathsItem `json:"paths"`
	Meta  MetaMap            `json:"meta"`
}

SignerPathsResponse is the JSON response from $searchRoot/camli/search/signerpaths.

type SortType 

type SortType int
const (
	UnspecifiedSort SortType = iota
	LastModifiedDesc
	LastModifiedAsc
	CreatedDesc
	CreatedAsc
)

func (SortType) MarshalJSON 

func (t SortType) MarshalJSON() ([]byte, error)

func (*SortType) UnmarshalJSON 

func (t *SortType) UnmarshalJSON(v []byte) error

type StringConstraint 

type StringConstraint struct {
	Empty           bool           `json:"empty,omitempty"` // matches empty string
	Equals          string         `json:"equals,omitempty"`
	Contains        string         `json:"contains,omitempty"`
	HasPrefix       string         `json:"hasPrefix,omitempty"`
	HasSuffix       string         `json:"hasSuffix,omitempty"`
	ByteLength      *IntConstraint `json:"byteLength,omitempty"` // length in bytes (not chars)
	CaseInsensitive bool           `json:"caseInsensitive,omitempty"`
}

A StringConstraint specifies constraints on a string. All non-zero must match.

type TimeConstraint 

type TimeConstraint struct {
	Before types.Time3339 `json:"before"` // <
	After  types.Time3339 `json:"after"`  // >=

	// TODO: this won't JSON-marshal/unmarshal well. Make a time.Duration marshal type?
	// Likewise with time that supports omitempty?
	InLast time.Duration `json:"inLast"` // >=
}

type WithAttrItem 

type WithAttrItem struct {
	Permanode blob.Ref `json:"permanode"`
}

A WithAttrItem is an item returned from $searchRoot/camli/search/permanodeattr.

type WithAttrRequest 

type WithAttrRequest struct {
	N      int      // max number of results
	Signer blob.Ref // if nil, will use the server's default owner (if configured)
	// Requested attribute. If blank, all attributes are searched (for Value)
	// as fulltext.
	Attr string
	// Value of the requested attribute. If blank, permanodes which have
	// request.Attr as an attribute are searched.
	Value         string
	Fuzzy         bool // fulltext search (if supported).
	ThumbnailSize int  // if zero, no thumbnails
}

WithAttrRequest is a request to get a WithAttrResponse.

func (*WithAttrRequest) URLSuffix 

func (r *WithAttrRequest) URLSuffix() string

type WithAttrResponse 

type WithAttrResponse struct {
	WithAttr []*WithAttrItem `json:"withAttr"`
	Meta     MetaMap         `json:"meta"`

	Error     string `json:"error,omitempty"`
	ErrorType string `json:"errorType,omitempty"`
}

WithAttrResponse is the JSON response from $searchRoot/camli/search/permanodeattr.

func (*WithAttrResponse) Err 

func (r *WithAttrResponse) Err() error

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