noncebalancer

Documentation

Index

• Constants
• Variables
• type Balancer
  • func (b *Balancer) Build(buildInfo base.PickerBuildInfo) balancer.Picker
• type Picker
  • func (p *Picker) Pick(info balancer.PickInfo) (balancer.PickResult, error)

Constants

const (
	// Name is the name used to register the nonce balancer with the gRPC
	// runtime.
	Name = "nonce"

	// SRVResolverScheme is the scheme used to invoke an instance of the SRV
	// resolver which will use the noncebalancer to pick backends. It would be
	// ideal to export this from the SRV resolver package but that package is
	// internal.
	SRVResolverScheme = "nonce-srv"
)

Variables

var ErrNoBackendsMatchPrefix = status.New(codes.Unavailable, "no backends match the nonce prefix")

ErrNoBackendsMatchPrefix indicates that no backends were found which match the nonce prefix provided in the RPC context. This can happen when the provided nonce is stale, valid but the backend has since been removed from the balancer, or valid but the backend has not yet been added to the balancer.

In any case, when the WFE receives this error it will return a badNonce error to the ACME client.

Types

type Balancer

type Balancer struct{}

Balancer implements the base.PickerBuilder interface. It's used to create new balancer.Picker instances. It should only be used by nonce-service clients.

func (*Balancer) Build

func (b *Balancer) Build(buildInfo base.PickerBuildInfo) balancer.Picker

Build implements the base.PickerBuilder interface. It is called by the gRPC runtime when the balancer is first initialized and when the set of backend (SubConn) addresses changes.

type Picker

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

Picker implements the balancer.Picker interface. It picks a backend (SubConn) based on the nonce prefix contained in each request's Context.

func (*Picker) Pick

func (p *Picker) Pick(info balancer.PickInfo) (balancer.PickResult, error)

Pick implements the balancer.Picker interface. It is called by the gRPC runtime for each RPC message. It is responsible for picking a backend (SubConn) based on the context of each RPC message.