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registry/memory: add support for domain options (#1713) 

* registry/memory: add support for the domain options

* registry/memory: swap Fatal test cases with Error

* registry/memory: fix wildcard not found bug

* registry/memory: replace locks with rlocks

* registry/memory: fix deregistration bug
This commit is contained in:
ben-toogood 2020-06-18 12:39:19 +01:00 committed by GitHub
parent 5fd36d6cc0
commit 8c7c27c573
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 251 additions and 72 deletions
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279
registry/memory/memory.go
View File

@ -14,6 +14,7 @@ import (
var (
sendEventTime = 10 * time.Millisecond
ttlPruneTime = time.Second
defaultDomain = "micro"
)
type node struct {
@ -34,27 +35,32 @@ type Registry struct {
options registry.Options
sync.RWMutex
records map[string]map[string]*record
// records is a KV map with domain name as the key and a services map as the value
records map[string]services
watchers map[string]*Watcher
}
// services is a KV map with service name as the key and a map of records as the value
type services map[string]map[string]*record
// NewRegistry returns an initialized in-memory registry
func NewRegistry(opts ...registry.Option) registry.Registry {
options := registry.Options{
Context: context.Background(),
}
for _, o := range opts {
o(&options)
}
// records can be passed for testing purposes
records := getServiceRecords(options.Context)
if records == nil {
records = make(map[string]map[string]*record)
records = make(services)
}
reg := &Registry{
options: options,
records: records,
records: map[string]services{defaultDomain: records},
watchers: make(map[string]*Watcher),
}
@ -71,14 +77,16 @@ func (m *Registry) ttlPrune() {
select {
case <-prune.C:
m.Lock()
for name, records := range m.records {
for version, record := range records {
for id, n := range record.Nodes {
if n.TTL != 0 && time.Since(n.LastSeen) > n.TTL {
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry TTL expired for node %s of service %s", n.Id, name)
for domain, services := range m.records {
for service, versions := range services {
for version, record := range versions {
for id, n := range record.Nodes {
if n.TTL != 0 && time.Since(n.LastSeen) > n.TTL {
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry TTL expired for node %s of service %s", n.Id, service)
}
delete(m.records[domain][service][version].Nodes, id)
}
delete(m.records[name][version].Nodes, id)
}
}
}
@ -120,22 +128,30 @@ func (m *Registry) Init(opts ...registry.Option) error {
m.Lock()
defer m.Unlock()
records := getServiceRecords(m.options.Context)
for name, record := range records {
// add a whole new service including all of its versions
if _, ok := m.records[name]; !ok {
m.records[name] = record
// get the existing services from the records
srvs, ok := m.records[defaultDomain]
if !ok {
srvs = make(services)
}
// loop through the services and if it doesn't yet exist, add it to the slice. This is used for
// testing purposes.
for name, record := range getServiceRecords(m.options.Context) {
if _, ok := srvs[name]; !ok {
srvs[name] = record
continue
}
// add the versions of the service we dont track yet
for version, r := range record {
if _, ok := m.records[name][version]; !ok {
m.records[name][version] = r
if _, ok := srvs[name][version]; !ok {
srvs[name][version] = r
continue
}
}
}
// set the services in the registry
m.records[defaultDomain] = srvs
return nil
}
@ -147,34 +163,44 @@ func (m *Registry) Register(s *registry.Service, opts ...registry.RegisterOption
m.Lock()
defer m.Unlock()
// parse the options, fallback to the default domain
var options registry.RegisterOptions
for _, o := range opts {
o(&options)
}
r := serviceToRecord(s, options.TTL)
if _, ok := m.records[s.Name]; !ok {
m.records[s.Name] = make(map[string]*record)
if len(options.Domain) == 0 {
options.Domain = defaultDomain
}
if _, ok := m.records[s.Name][s.Version]; !ok {
m.records[s.Name][s.Version] = r
// get the services for this domain from the registry
srvs, ok := m.records[options.Domain]
if !ok {
srvs = make(services)
}
// ensure the service name exists
r := serviceToRecord(s, options.TTL)
if _, ok := srvs[s.Name]; !ok {
srvs[s.Name] = make(map[string]*record)
}
if _, ok := srvs[s.Name][s.Version]; !ok {
srvs[s.Name][s.Version] = r
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry added new service: %s, version: %s", s.Name, s.Version)
}
m.records[options.Domain] = srvs
go m.sendEvent(&registry.Result{Action: "update", Service: s})
return nil
}
addedNodes := false
for _, n := range s.Nodes {
if _, ok := m.records[s.Name][s.Version].Nodes[n.Id]; !ok {
if _, ok := srvs[s.Name][s.Version].Nodes[n.Id]; !ok {
addedNodes = true
metadata := make(map[string]string)
for k, v := range n.Metadata {
metadata[k] = v
m.records[s.Name][s.Version].Nodes[n.Id] = &node{
srvs[s.Name][s.Version].Nodes[n.Id] = &node{
Node: &registry.Node{
Id: n.Id,
Address: n.Address,
@ -192,18 +218,18 @@ func (m *Registry) Register(s *registry.Service, opts ...registry.RegisterOption
logger.Debugf("Registry added new node to service: %s, version: %s", s.Name, s.Version)
}
go m.sendEvent(&registry.Result{Action: "update", Service: s})
return nil
}
// refresh TTL and timestamp
for _, n := range s.Nodes {
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Updated registration for service: %s, version: %s", s.Name, s.Version)
} else {
// refresh TTL and timestamp
for _, n := range s.Nodes {
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Updated registration for service: %s, version: %s", s.Name, s.Version)
}
srvs[s.Name][s.Version].Nodes[n.Id].TTL = options.TTL
srvs[s.Name][s.Version].Nodes[n.Id].LastSeen = time.Now()
}
m.records[s.Name][s.Version].Nodes[n.Id].TTL = options.TTL
m.records[s.Name][s.Version].Nodes[n.Id].LastSeen = time.Now()
}
m.records[options.Domain] = srvs
return nil
}
@ -211,74 +237,185 @@ func (m *Registry) Deregister(s *registry.Service, opts ...registry.DeregisterOp
m.Lock()
defer m.Unlock()
if _, ok := m.records[s.Name]; ok {
if _, ok := m.records[s.Name][s.Version]; ok {
for _, n := range s.Nodes {
if _, ok := m.records[s.Name][s.Version].Nodes[n.Id]; ok {
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry removed node from service: %s, version: %s", s.Name, s.Version)
}
delete(m.records[s.Name][s.Version].Nodes, n.Id)
}
}
if len(m.records[s.Name][s.Version].Nodes) == 0 {
delete(m.records[s.Name], s.Version)
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry removed service: %s, version: %s", s.Name, s.Version)
}
}
}
if len(m.records[s.Name]) == 0 {
delete(m.records, s.Name)
// parse the options, fallback to the default domain
var options registry.DeregisterOptions
for _, o := range opts {
o(&options)
}
if len(options.Domain) == 0 {
options.Domain = defaultDomain
}
// if the domain doesn't exist, there is nothing to deregister
services, ok := m.records[options.Domain]
if !ok {
return nil
}
// if no services with this name and version exist, there is nothing to deregister
versions, ok := services[s.Name]
if !ok {
return nil
}
version, ok := versions[s.Version]
if !ok {
return nil
}
// deregister all of the service nodes from this version
for _, n := range s.Nodes {
if _, ok := version.Nodes[n.Id]; ok {
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry removed service: %s", s.Name)
logger.Debugf("Registry removed node from service: %s, version: %s", s.Name, s.Version)
}
delete(version.Nodes, n.Id)
}
}
// if the nodes not empty, we replace the version in the store and exist, the rest of the logic
// is cleanup
if len(version.Nodes) > 0 {
m.records[options.Domain][s.Name][s.Version] = version
return nil
}
// if this version was the only version of the service, we can remove the whole service from the
// registry and exit
if len(versions) == 1 {
delete(m.records[options.Domain], s.Name)
go m.sendEvent(&registry.Result{Action: "delete", Service: s})
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry removed service: %s", s.Name)
}
return nil
}
// there are other versions of the service running, so only remove this version of it
delete(m.records[options.Domain][s.Name], s.Version)
if logger.V(logger.DebugLevel, logger.DefaultLogger) {
logger.Debugf("Registry removed service: %s, version: %s", s.Name, s.Version)
}
return nil
}
func (m *Registry) GetService(name string, opts ...registry.GetOption) ([]*registry.Service, error) {
// parse the options, fallback to the default domain
var options registry.GetOptions
for _, o := range opts {
o(&options)
}
if len(options.Domain) == 0 {
options.Domain = defaultDomain
}
// if it's a wildcard domain, return from all domains
if options.Domain == registry.WildcardDomain {
m.RLock()
recs := m.records
m.RUnlock()
var services []*registry.Service
for domain := range recs {
srvs, err := m.GetService(name, append(opts, registry.GetDomain(domain))...)
if err == registry.ErrNotFound {
continue
} else if err != nil {
return nil, err
}
services = append(services, srvs...)
}
if len(services) == 0 {
return nil, registry.ErrNotFound
}
return services, nil
}
m.RLock()
defer m.RUnlock()
records, ok := m.records[name]
// check the domain exists
services, ok := m.records[options.Domain]
if !ok {
return nil, registry.ErrNotFound
}
services := make([]*registry.Service, len(m.records[name]))
i := 0
for _, record := range records {
services[i] = recordToService(record)
i++
// check the service exists
versions, ok := services[name]
if !ok || len(versions) == 0 {
return nil, registry.ErrNotFound
}
return services, nil
// serialize the response
result := make([]*registry.Service, len(versions))
i := 0
for _, r := range versions {
result[i] = recordToService(r, options.Domain)
i++
}
return result, nil
}
func (m *Registry) ListServices(opts ...registry.ListOption) ([]*registry.Service, error) {
// parse the options, fallback to the default domain
var options registry.ListOptions
for _, o := range opts {
o(&options)
}
if len(options.Domain) == 0 {
options.Domain = defaultDomain
}
// if it's a wildcard domain, list from all domains
if options.Domain == registry.WildcardDomain {
m.RLock()
recs := m.records
m.RUnlock()
var services []*registry.Service
for domain := range recs {
srvs, err := m.ListServices(append(opts, registry.ListDomain(domain))...)
if err != nil {
return nil, err
}
services = append(services, srvs...)
}
return services, nil
}
m.RLock()
defer m.RUnlock()
var services []*registry.Service
for _, records := range m.records {
for _, record := range records {
services = append(services, recordToService(record))
}
// ensure the domain exists
services, ok := m.records[options.Domain]
if !ok {
return make([]*registry.Service, 0), nil
}
return services, nil
// serialize the result, each version counts as an individual service
var result []*registry.Service
for domain, service := range services {
for _, version := range service {
result = append(result, recordToService(version, domain))
}
}
return result, nil
}
func (m *Registry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
// parse the options, fallback to the default domain
var wo registry.WatchOptions
for _, o := range opts {
o(&wo)
}
if len(wo.Domain) == 0 {
wo.Domain = defaultDomain
}
// construct the watcher
w := &Watcher{
exit: make(chan bool),
res: make(chan *registry.Result),

36
registry/memory/memory_test.go
View File

@ -244,3 +244,39 @@ func TestMemoryRegistryTTLConcurrent(t *testing.T) {
}
}
}
func TestMemoryWildcard(t *testing.T) {
m := NewRegistry()
testSrv := &registry.Service{Name: "foo", Version: "1.0.0"}
if err := m.Register(testSrv, registry.RegisterDomain("one")); err != nil {
t.Fatalf("Register err: %v", err)
}
if err := m.Register(testSrv, registry.RegisterDomain("two")); err != nil {
t.Fatalf("Register err: %v", err)
}
if recs, err := m.ListServices(registry.ListDomain("one")); err != nil {
t.Errorf("List err: %v", err)
} else if len(recs) != 1 {
t.Errorf("Expected 1 record, got %v", len(recs))
}
if recs, err := m.ListServices(registry.ListDomain("*")); err != nil {
t.Errorf("List err: %v", err)
} else if len(recs) != 2 {
t.Errorf("Expected 2 records, got %v", len(recs))
}
if recs, err := m.GetService(testSrv.Name, registry.GetDomain("one")); err != nil {
t.Errorf("Get err: %v", err)
} else if len(recs) != 1 {
t.Errorf("Expected 1 record, got %v", len(recs))
}
if recs, err := m.GetService(testSrv.Name, registry.GetDomain("*")); err != nil {
t.Errorf("Get err: %v", err)
} else if len(recs) != 2 {
t.Errorf("Expected 2 records, got %v", len(recs))
}
}

5
registry/memory/util.go
View File

@ -35,12 +35,15 @@ func serviceToRecord(s *registry.Service, ttl time.Duration) *record {
}
}
func recordToService(r *record) *registry.Service {
func recordToService(r *record, domain string) *registry.Service {
metadata := make(map[string]string, len(r.Metadata))
for k, v := range r.Metadata {
metadata[k] = v
}
// set the domain in metadata so it can be determined when a wildcard query is performed
metadata["domain"] = domain
endpoints := make([]*registry.Endpoint, len(r.Endpoints))
for i, e := range r.Endpoints {
request := new(registry.Value)

3
registry/memory/watcher.go
View File

@ -20,6 +20,9 @@ func (m *Watcher) Next() (*registry.Result, error) {
if len(m.wo.Service) > 0 && m.wo.Service != r.Service.Name {
continue
}
if m.wo.Domain != registry.WildcardDomain && m.wo.Domain != m.wo.Domain {
continue
}
return r, nil
case <-m.exit:
return nil, errors.New("watcher stopped")