pod

haystack

Haystack model and client API

mixins

Def	Def models a definition dictionary
Dict	Dict is a map of name/value pairs.
Grid	Two dimensional tabular data structure composed of Cols and Rows.
HaystackContext	HaystackContext defines an environment of defs and data
Namespace	Namespace models a symbolic namespace of defs

classes

Bin	Bin is a tag value for a binary file stored on disk rather than in the in-memory record database.
Client	Client manages a network connection to a haystack server.
Col	Column of a Grid
Coord	Geographic coordinate as latitude and longitute in decimal degrees.
CsvReader	Read Haystack data in CSV format.
CsvWriter	Write Haystack data in CSV format.
DateSpan	DateSpan models a span of time between two dates.
Etc	Etc is the utility methods for Haystack.
Filter	Filter models a declarative predicate for selecting dicts.
GridBuilder	GridBuilder is used to build up an immutable `Grid`.
HaystackTest	HaystackTest provides convenience methods for testing common Haystack data structures.
HisItem	HisItem is a timestamp/value pair.
JsonReader	Read Haystack data in JSON format.
JsonWriter	Write Haystack data in JSON format.
Kind	Kind provides a type signature for a Haystack data value
Marker	Marker is the singleton which indicates a marker tag with no value.
NA	NA is the singleton which indicates not available.
Number	Number represents a numeric value and an optional Unit.
Ref	Ref is used to model a record identifier and optional display string.
Remove	Remove is the singleton which indicates a remove operation.
Row	Row of a Grid.
Span	Span models a range of time using an inclusive starting timestamp and exclusive ending timestamp.
Symbol	Symbol is a name to a def in the meta-model namespace
TrioReader	Read Haystack data in Trio format.
TrioWriter	Write Haystack data in Trio format.
TypedDict	TypedDict wraps a dict that maps tags to statically typed fields.
XStr	XStr is an extended string which is a type name and value encoded as a string.
ZincReader	Read Haystack data in Zinc format.
ZincWriter	Write Haystack data in Zinc format.

enums

SpanMode	SpanMode enumerates relative or absolute span modes

facets

TypedTag	Facet to annotate a `TypedDict` field.

errs

CallErr	CallErr is raised when a server returns an error grid from a client call to a REST operation.
DependErr	DependErr indicates a missing dependency
DisabledErr	DisabledErr indicates access of a disabled resource.
DownErr	DownErr indicates a communications or networking problem
FaultErr	FaultErr indicates a software or configuration problem
UnitErr	UnitErr indicates an operation between two incompatible units
UnknownNameErr	UnknownNameErr is thrown when `Dict.trap` or `Grid.col` fails to resolve a name.
UnknownRecErr	UnknownKindErr when a Kind cannot be resolved or parsed
ValidateErr	ValidateErr when a validation fails.