Struct Resolver

resolver/manual/manual.go:44–69

Resolver is also a resolver builder. It's build() function always returns itself.

// Resolver is also a resolver builder.
// It's build() function always returns itself.
type Resolver struct {
	// BuildCallback is called when the Build method is called.  Must not be
	// nil.  Must not be changed after the resolver may be built.
	BuildCallback func(resolver.Target, resolver.ClientConn, resolver.BuildOptions)
	// UpdateStateCallback is called when the UpdateState method is called on
	// the resolver.  The value passed as argument to this callback is the value
	// returned by the resolver.ClientConn.  Must not be nil.  Must not be
	// changed after the resolver may be built.
	UpdateStateCallback func(err error)
	// ResolveNowCallback is called when the ResolveNow method is called on the
	// resolver.  Must not be nil.  Must not be changed after the resolver may
	// be built.
	ResolveNowCallback func(resolver.ResolveNowOptions)
	// CloseCallback is called when the Close method is called.  Must not be
	// nil.  Must not be changed after the resolver may be built.
	CloseCallback func()
	scheme        string

	// Fields actually belong to the resolver.
	// Guards access to below fields.
	mu sync.Mutex
	cc resolver.ClientConn
	// Storing the most recent state update makes this resolver resilient to
	// restarts, which is possible with channel idleness.
	lastSeenState *resolver.State
}

// InitialState adds initial state to the resolver so that UpdateState doesn't
// need to be explicitly called after Dial.