reads

package
v1.7.7 Latest Latest
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 Go to latest Published: Jun 26, 2019 License: MIT Imports: 31 Imported by: 0

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Index

Constants

View Source 
const (
	// MaxPointsPerBlock is the maximum number of points in an encoded
	// block in a TSM file. It should match the value in the tsm1
	// package, but we don't want to import it.
	MaxPointsPerBlock = 1000
)

Variables

View Source 
var (
	// ErrSeriesKeyOrder means the series keys for a ResultSetStreamReader were
	// incorrectly ordered.
	ErrSeriesKeyOrder = errors.New("invalid series key order")

	// ErrPartitionKeyOrder means the partition keys for a
	// GroupResultSetStreamReader were incorrectly ordered.
	ErrPartitionKeyOrder = errors.New("invalid partition key order")

	// ErrStreamNoData means the StreamReader repeatedly returned no data
	// when calling Recv
	ErrStreamNoData = errors.New("peekFrame: no data")
)
View Source 
var BooleanEmptyArrayCursor cursors.BooleanArrayCursor = &booleanEmptyArrayCursor{}
View Source 
var FloatEmptyArrayCursor cursors.FloatArrayCursor = &floatEmptyArrayCursor{}
View Source 
var IntegerEmptyArrayCursor cursors.IntegerArrayCursor = &integerEmptyArrayCursor{}
View Source 
var StringEmptyArrayCursor cursors.StringArrayCursor = &stringEmptyArrayCursor{}
View Source 
var UnsignedEmptyArrayCursor cursors.UnsignedArrayCursor = &unsignedEmptyArrayCursor{}

Functions

func EvalExprBool 

func EvalExprBool(expr influxql.Expr, m Valuer) bool

func HasFieldValueKey 

func HasFieldValueKey(expr influxql.Expr) bool

func IsTrueBooleanLiteral 

func IsTrueBooleanLiteral(expr influxql.Expr) bool

func NewReader 

func NewReader(s Store) influxdb.Reader

func NodeToExpr 

func NodeToExpr(node *datatypes.Node, remap map[string]string) (influxql.Expr, error)

NodeToExpr transforms a predicate node to an influxql.Expr.

func PredicateToExprString 

func PredicateToExprString(p *datatypes.Predicate) string

func RewriteExprRemoveFieldValue 

func RewriteExprRemoveFieldValue(expr influxql.Expr) influxql.Expr

func WalkChildren 

func WalkChildren(v NodeVisitor, node *datatypes.Node)

func WalkNode 

func WalkNode(v NodeVisitor, node *datatypes.Node)

Types

type GroupCursor 

type GroupCursor interface {
	// Next advances to the next cursor. Next will return false when there are no
	// more cursors in the current group.
	Next() bool

	// Cursor returns the most recent cursor after a call to Next.
	Cursor() cursors.Cursor

	// Tags returns the tags for the most recent cursor after a call to Next.
	Tags() models.Tags

	// Keys returns the union of all tag key names for all series produced by
	// this GroupCursor.
	Keys() [][]byte

	// PartitionKeyVals returns the values of all tags identified by the
	// keys specified in ReadRequest#GroupKeys. The tag values values will
	// appear in the same order as the GroupKeys.
	//
	// When the datatypes.GroupNone strategy is specified, PartitionKeyVals will
	// be nil.
	PartitionKeyVals() [][]byte

	// Close releases any resources allocated by the GroupCursor.
	Close()

	// Err returns the first error encountered by the GroupCursor.
	Err() error

	Stats() cursors.CursorStats
}

type GroupOption 

type GroupOption func(g *groupResultSet)

func GroupOptionNilSortLo 

func GroupOptionNilSortLo() GroupOption

GroupOptionNilSortLo configures nil values to be sorted lower than any other value

type GroupResultSet 

type GroupResultSet interface {
	// Next advances the GroupResultSet and returns the next GroupCursor. It
	// returns nil if there are no more groups.
	Next() GroupCursor

	// Close releases any resources allocated by the GroupResultSet.
	Close()

	// Err returns the first error encountered by the GroupResultSet.
	Err() error
}

func NewGroupByMergedGroupResultSet 

func NewGroupByMergedGroupResultSet(g []GroupResultSet) GroupResultSet

Returns a GroupResultSet that merges results using the datatypes.GroupBy strategy. Each source GroupResultSet in g must be configured using the GroupBy strategy with the same GroupKeys or the results are undefined.

func NewGroupNoneMergedGroupResultSet 

func NewGroupNoneMergedGroupResultSet(g []GroupResultSet) GroupResultSet

Returns a GroupResultSet that merges results using the datatypes.GroupNone strategy. Each source GroupResultSet in g must be configured using the GroupNone strategy or the results are undefined.

The GroupNone strategy must merge the partition key and tag keys from each source GroupResultSet when producing its

func NewGroupResultSet 

func NewGroupResultSet(ctx context.Context, req *datatypes.ReadRequest, newCursorFn func() (SeriesCursor, error), opts ...GroupOption) GroupResultSet

type GroupResultSetStreamReader 

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

func NewGroupResultSetStreamReader 

func NewGroupResultSetStreamReader(stream StreamReader) *GroupResultSetStreamReader

func (*GroupResultSetStreamReader) Close 

func (r *GroupResultSetStreamReader) Close()

func (*GroupResultSetStreamReader) Err 

func (r *GroupResultSetStreamReader) Err() error

func (*GroupResultSetStreamReader) Next 

func (r *GroupResultSetStreamReader) Next() GroupCursor

type NodeVisitor 

type NodeVisitor interface {
	Visit(*datatypes.Node) NodeVisitor
}

NodeVisitor can be called by Walk to traverse the Node hierarchy. The Visit() function is called once per node.

type ResponseStream 

type ResponseStream interface {
	Send(*datatypes.ReadResponse) error
	// SetTrailer sets the trailer metadata which will be sent with the RPC status.
	// When called more than once, all the provided metadata will be merged.
	SetTrailer(metadata.MD)
}

type ResponseWriter 

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

func NewResponseWriter 

func NewResponseWriter(stream ResponseStream, hints datatypes.HintFlags) *ResponseWriter

func (*ResponseWriter) Err 

func (w *ResponseWriter) Err() error

func (*ResponseWriter) Flush 

func (w *ResponseWriter) Flush()

func (*ResponseWriter) WriteGroupResultSet 

func (w *ResponseWriter) WriteGroupResultSet(rs GroupResultSet) error

func (*ResponseWriter) WriteResultSet 

func (w *ResponseWriter) WriteResultSet(rs ResultSet) error

func (*ResponseWriter) WrittenN 

func (w *ResponseWriter) WrittenN() int

WrittenN returns the number of values written to the response stream.

type ResultSet 

type ResultSet interface {
	// Next advances the ResultSet to the next cursor. It returns false
	// when there are no more cursors.
	Next() bool

	// Cursor returns the most recent cursor after a call to Next.
	Cursor() cursors.Cursor

	// Tags returns the tags for the most recent cursor after a call to Next.
	Tags() models.Tags

	// Close releases any resources allocated by the ResultSet.
	Close()

	// Err returns the first error encountered by the ResultSet.
	Err() error

	Stats() cursors.CursorStats
}

func NewMergedResultSet 

func NewMergedResultSet(results []ResultSet) ResultSet

func NewResultSet 

func NewResultSet(ctx context.Context, req *datatypes.ReadRequest, cur SeriesCursor) ResultSet

type ResultSetStreamReader 

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

func NewResultSetStreamReader 

func NewResultSetStreamReader(stream StreamReader) *ResultSetStreamReader

func (*ResultSetStreamReader) Close 

func (r *ResultSetStreamReader) Close()

func (*ResultSetStreamReader) Cursor 

func (r *ResultSetStreamReader) Cursor() cursors.Cursor

func (*ResultSetStreamReader) Err 

func (r *ResultSetStreamReader) Err() error

func (*ResultSetStreamReader) Next 

func (r *ResultSetStreamReader) Next() bool

func (*ResultSetStreamReader) Stats 

func (r *ResultSetStreamReader) Stats() cursors.CursorStats

func (*ResultSetStreamReader) Tags 

func (r *ResultSetStreamReader) Tags() models.Tags

type SeriesCursor 

type SeriesCursor interface {
	Close()
	Next() *SeriesRow
	Err() error
}

func NewLimitSeriesCursor 

func NewLimitSeriesCursor(ctx context.Context, cur SeriesCursor, n, o int64) SeriesCursor

type SeriesRow 

type SeriesRow struct {
	SortKey    []byte
	Name       []byte      // measurement name
	SeriesTags models.Tags // unmodified series tags
	Tags       models.Tags
	Field      string
	Query      cursors.CursorIterators
	ValueCond  influxql.Expr
}

type StorageReadClient 

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

StorageReadClient adapts a Storage_ReadClient to implement cursors.Statistics and read the statistics from the gRPC trailer.

func NewStorageReadClient 

func NewStorageReadClient(c datatypes.Storage_ReadClient) *StorageReadClient

NewStorageReadClient returns a new StorageReadClient which implements StreamReader and reads the gRPC trailer to return CursorStats.

func (*StorageReadClient) Recv 

func (rc *StorageReadClient) Recv() (res *datatypes.ReadResponse, err error)

func (*StorageReadClient) Stats 

func (rc *StorageReadClient) Stats() (stats cursors.CursorStats)

type Store 

type Store interface {
	Read(ctx context.Context, req *datatypes.ReadRequest) (ResultSet, error)
	GroupRead(ctx context.Context, req *datatypes.ReadRequest) (GroupResultSet, error)
	GetSource(rs influxdb.ReadSpec) (proto.Message, error)
}

type StreamReader 

type StreamReader interface {
	Recv() (*datatypes.ReadResponse, error)
}

type Valuer 

type Valuer interface {
	// Value returns the value and existence flag for a given key.
	Value(key string) (interface{}, bool)
}

Valuer is the interface that wraps the Value() method.

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