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Package baggage

func ContextWithGetHook ¶

func ContextWithGetHook(parent context.Context, hook GetHookFunc) context.Context

ContextWithGetHook returns a copy of parent with hook configured to be invoked every time FromContext is called.

Passing nil GetHookFunc creates a context with no get hook to call.

func ContextWithList ¶

func ContextWithList(parent context.Context, list List) context.Context

ContextWithList returns a copy of parent with baggage. Passing nil list returns a context without any baggage.

func ContextWithSetHook ¶

func ContextWithSetHook(parent context.Context, hook SetHookFunc) context.Context

ContextWithSetHook returns a copy of parent with hook configured to be invoked every time ContextWithBaggage is called.

Passing nil SetHookFunc creates a context with no set hook to call.

type GetHookFunc ¶

GetHookFunc is a callback called when getting baggage from the context.

type GetHookFunc func(context.Context, List) List

type Item ¶

Item is the value and metadata properties part of a list-member.

type Item struct {
    Value      string
    Properties []Property
}

type List ¶

List is the collection of baggage members. The W3C allows for duplicates, but OpenTelemetry does not, therefore, this is represented as a map.

type List map[string]Item

func ListFromContext ¶

func ListFromContext(ctx context.Context) List

ListFromContext returns the baggage contained in ctx.

type Property ¶

Property is a metadata entry for a list-member.

type Property struct {
    Key, Value string

    // HasValue indicates if a zero-value value means the property does not
    // have a value or if it was the zero-value.
    HasValue bool
}

type SetHookFunc ¶

SetHookFunc is a callback called when storing baggage in the context.

type SetHookFunc func(context.Context, List) context.Context