open-consul/agent/grpc-internal/resolver/registry.go

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package resolver
import (
"fmt"
"sync"
"google.golang.org/grpc/resolver"
)
// registry of ServerResolverBuilder. This type exists because grpc requires that
// resolvers are registered globally before any requests are made. This is
// incompatible with our resolver implementation and testing strategy, which
// requires a different Resolver for each test.
type registry struct {
lock sync.RWMutex
byAuthority map[string]*ServerResolverBuilder
}
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func (r *registry) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
r.lock.RLock()
defer r.lock.RUnlock()
//nolint:staticcheck
res, ok := r.byAuthority[target.Authority]
if !ok {
//nolint:staticcheck
return nil, fmt.Errorf("no resolver registered for %v", target.Authority)
}
return res.Build(target, cc, opts)
}
func (r *registry) Scheme() string {
return "consul"
}
var _ resolver.Builder = (*registry)(nil)
var reg = &registry{byAuthority: make(map[string]*ServerResolverBuilder)}
func init() {
resolver.Register(reg)
}
// Register a ServerResolverBuilder with the global registry.
func Register(res *ServerResolverBuilder) {
reg.lock.Lock()
defer reg.lock.Unlock()
reg.byAuthority[res.Authority()] = res
}
// Deregister the ServerResolverBuilder associated with the authority. Only used
// for testing.
func Deregister(authority string) {
reg.lock.Lock()
defer reg.lock.Unlock()
delete(reg.byAuthority, authority)
}