micro/flow/context.go

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package flow
import (
"context"
)
type flowKey struct{}
// FromContext returns Flow from context
func FromContext(ctx context.Context) (Flow, bool) {
if ctx == nil {
return nil, false
}
c, ok := ctx.Value(flowKey{}).(Flow)
return c, ok
}
// NewContext stores Flow to context
func NewContext(ctx context.Context, f Flow) context.Context {
if ctx == nil {
ctx = context.Background()
}
return context.WithValue(ctx, flowKey{}, f)
}
// SetOption returns a function to setup a context with given value
func SetOption(k, v interface{}) Option {
return func(o *Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, k, v)
}
}