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registry.go
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registry.go
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package client
import "fmt"
var (
globalRegistry *Registry
)
// Registry contains all known service descriptors and allows accessing
// them by domain name and version.
// It is responsibility of developer to import all resource packages in order to
// ensure their registration.
type Registry struct {
methodDescriptors map[string]MethodDescriptor
apiDescriptors map[string]ApiDescriptor
svcDescriptors map[string]ServiceDescriptor
}
// FindMethodDescriptor gives method descriptor based on full method name, for example
// "/ntt.iam.v1alpha.ProjectService/ListProjects" - can be obtained from grpc.UnaryServerInfo
// or grpc.StreamServerInfo
func (r *Registry) FindMethodDescriptor(fullMethodName string) MethodDescriptor {
return r.methodDescriptors[fullMethodName]
}
// FindApiDescriptor gives API descriptor based on full api name, for example
// "/ntt.iam.v1alpha.ProjectService" - basically this is same as full method name from
// grpc.UnaryServerInfo or grpc.StreamServerInfo without method name and trailing '/'
func (r *Registry) FindApiDescriptor(fullApiName string) ApiDescriptor {
return r.apiDescriptors[fullApiName]
}
func (r *Registry) FindAllVersionsOfServiceDescriptors(serviceDomain string) []ServiceDescriptor {
svcDescriptors := make([]ServiceDescriptor, 0)
for _, svcDescriptor := range r.svcDescriptors {
if svcDescriptor.GetServiceDomain() == serviceDomain {
svcDescriptors = append(svcDescriptors, svcDescriptor)
}
}
return svcDescriptors
}
func (r *Registry) GetVersionSortedServiceDescriptors(serviceDomain string) ([]ServiceDescriptor, error) {
allVersionDescs := r.FindAllVersionsOfServiceDescriptors(serviceDomain)
sortedDescs := make([]ServiceDescriptor, 0)
nextVersion := ""
for len(sortedDescs) < len(allVersionDescs) {
found := false
for _, desc := range allVersionDescs {
if desc.GetNextVersion() == nextVersion {
sortedDescs = append(sortedDescs, desc)
nextVersion = desc.GetVersion()
found = true
break
}
}
if !found {
return nil, fmt.Errorf("could not find service %s with version %s, ensure client package is imported",
serviceDomain, nextVersion)
}
}
return sortedDescs, nil
}
func (r *Registry) FindNewestVersionServiceDescriptor(serviceDomain string) ServiceDescriptor {
for _, svcDescriptor := range r.svcDescriptors {
if svcDescriptor.GetServiceDomain() == serviceDomain && svcDescriptor.GetNextVersion() == "" {
return svcDescriptor
}
}
return nil
}
func (r *Registry) FindVersionedServiceDescriptor(serviceDomain, version string) ServiceDescriptor {
return r.svcDescriptors[fmt.Sprintf("%s/%s", serviceDomain, version)]
}
func (r *Registry) RegisterMethodDescriptor(descriptor MethodDescriptor) {
r.methodDescriptors[descriptor.GetFullMethodName()] = descriptor
}
func (r *Registry) RegisterApiDescriptor(descriptor ApiDescriptor) {
r.apiDescriptors[descriptor.GetFullAPIName()] = descriptor
}
func (r *Registry) RegisterSvcDescriptor(descriptor ServiceDescriptor) {
r.svcDescriptors[fmt.Sprintf("%s/%s", descriptor.GetServiceDomain(), descriptor.GetVersion())] = descriptor
}
// GetRegistry returns global registry instance
func GetRegistry() *Registry {
ensureRegistryExists()
return globalRegistry
}
func ensureRegistryExists() {
if globalRegistry == nil {
globalRegistry = &Registry{
methodDescriptors: make(map[string]MethodDescriptor),
apiDescriptors: make(map[string]ApiDescriptor),
svcDescriptors: make(map[string]ServiceDescriptor),
}
}
}
func init() {
ensureRegistryExists()
}