internal

Documentation

Overview

Package internal contains gRPC-internal code, to avoid polluting the godoc of the top-level grpc package. It must not import any grpc symbols to avoid circular dependencies.

Index

• Constants
• Variables
• type HealthChecker

Constants

const (
	// CredsBundleModeFallback switches GoogleDefaultCreds to fallback mode.
	CredsBundleModeFallback = "fallback"
	// CredsBundleModeBalancer switches GoogleDefaultCreds to grpclb balancer
	// mode.
	CredsBundleModeBalancer = "balancer"
	// CredsBundleModeBackendFromBalancer switches GoogleDefaultCreds to mode
	// that supports backend returned by grpclb balancer.
	CredsBundleModeBackendFromBalancer = "backend-from-balancer"
)

Variables

var (
	// WithResolverBuilder is exported by dialoptions.go
	WithResolverBuilder interface{} // func (resolver.Builder) grpc.DialOption
	// WithHealthCheckFunc is not exported by dialoptions.go
	WithHealthCheckFunc interface{} // func (HealthChecker) DialOption
	// HealthCheckFunc is used to provide client-side LB channel health checking
	HealthCheckFunc HealthChecker
	// BalancerUnregister is exported by package balancer to unregister a balancer.
	BalancerUnregister func(name string)
	// KeepaliveMinPingTime is the minimum ping interval.  This must be 10s by
	// default, but tests may wish to set it lower for convenience.
	KeepaliveMinPingTime = 10 * time.Second
	// ParseServiceConfig is a function to parse JSON service configs into
	// opaque data structures.
	ParseServiceConfig func(sc string) (interface{}, error)
	// StatusRawProto is exported by status/status.go. This func returns a
	// pointer to the wrapped Status proto for a given status.Status without a
	// call to proto.Clone(). The returned Status proto should not be mutated by
	// the caller.
	StatusRawProto interface{} // func (*status.Status) *spb.Status
)

Types

type HealthChecker

type HealthChecker func(ctx context.Context, newStream func(string) (interface{}, error), setConnectivityState func(connectivity.State), serviceName string) error

HealthChecker defines the signature of the client-side LB channel health checking function.

The implementation is expected to create a health checking RPC stream by calling newStream(), watch for the health status of serviceName, and report it's health back by calling setConnectivityState().

The health checking protocol is defined at: https://github.com/grpc/grpc/blob/master/doc/health-checking.md