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Merge pull request #76 from micro/selector

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Add Label and Version based Filters
This commit is contained in:
Asim Aslam 2016-04-23 21:42:53 +01:00
commit 2fd476a16f
6 changed files with 321 additions and 9 deletions
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4
client/options.go
View File

@ -187,9 +187,9 @@ func DialTimeout(d time.Duration) Option {
// Call Options
func WithSelectOption(so selector.SelectOption) CallOption {
func WithSelectOption(so ...selector.SelectOption) CallOption {
return func(o *CallOptions) {
o.SelectOptions = append(o.SelectOptions, so)
o.SelectOptions = append(o.SelectOptions, so...)
}
}

2
examples/client/dc_filter/dc_filter.go
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@ -41,7 +41,7 @@ func (dc *dcWrapper) Call(ctx context.Context, req client.Request, rsp interface
}
callOptions := append(opts, client.WithSelectOption(
selector.Filter(filter),
selector.WithFilter(filter),
))
fmt.Printf("[DC Wrapper] filtering for datacenter %s\n", md["datacenter"])

73
selector/filter.go Normal file
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@ -0,0 +1,73 @@
package selector
import (
"github.com/micro/go-micro/registry"
)
// FilterEndpoint is an endpoint based Select Filter which will
// only return services with the endpoint specified.
func FilterEndpoint(name string) Filter {
return func(old []*registry.Service) []*registry.Service {
var services []*registry.Service
for _, service := range old {
for _, ep := range service.Endpoints {
if ep.Name == name {
services = append(services, service)
break
}
}
}
return services
}
}
// FilterLabel is a label based Select Filter which will
// only return services with the label specified.
func FilterLabel(key, val string) Filter {
return func(old []*registry.Service) []*registry.Service {
var services []*registry.Service
for _, service := range old {
serv := new(registry.Service)
var nodes []*registry.Node
for _, node := range service.Nodes {
if node.Metadata == nil {
continue
}
if node.Metadata[key] == val {
nodes = append(nodes, node)
}
}
// only add service if there's some nodes
if len(nodes) > 0 {
// copy
*serv = *service
serv.Nodes = nodes
services = append(services, serv)
}
}
return services
}
}
// FilterVersion is a version based Select Filter which will
// only return services with the version specified.
func FilterVersion(version string) Filter {
return func(old []*registry.Service) []*registry.Service {
var services []*registry.Service
for _, service := range old {
if service.Version == version {
services = append(services, service)
}
}
return services
}
}

239
selector/filter_test.go Normal file
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@ -0,0 +1,239 @@
package selector
import (
"testing"
"github.com/micro/go-micro/registry"
)
func TestFilterEndpoint(t *testing.T) {
testData := []struct {
services []*registry.Service
endpoint string
count int
}{
{
services: []*registry.Service{
&registry.Service{
Name: "test",
Version: "1.0.0",
Endpoints: []*registry.Endpoint{
&registry.Endpoint{
Name: "Foo.Bar",
},
},
},
&registry.Service{
Name: "test",
Version: "1.1.0",
Endpoints: []*registry.Endpoint{
&registry.Endpoint{
Name: "Baz.Bar",
},
},
},
},
endpoint: "Foo.Bar",
count: 1,
},
{
services: []*registry.Service{
&registry.Service{
Name: "test",
Version: "1.0.0",
Endpoints: []*registry.Endpoint{
&registry.Endpoint{
Name: "Foo.Bar",
},
},
},
&registry.Service{
Name: "test",
Version: "1.1.0",
Endpoints: []*registry.Endpoint{
&registry.Endpoint{
Name: "Foo.Bar",
},
},
},
},
endpoint: "Bar.Baz",
count: 0,
},
}
for _, data := range testData {
filter := FilterEndpoint(data.endpoint)
services := filter(data.services)
if len(services) != data.count {
t.Fatalf("Expected %d services, got %d", data.count, len(services))
}
for _, service := range services {
var seen bool
for _, ep := range service.Endpoints {
if ep.Name == data.endpoint {
seen = true
break
}
}
if seen == false && data.count > 0 {
t.Fatalf("Expected %d services but seen is %t; result %+v", data.count, seen, services)
}
}
}
}
func TestFilterLabel(t *testing.T) {
testData := []struct {
services []*registry.Service
label [2]string
count int
}{
{
services: []*registry.Service{
&registry.Service{
Name: "test",
Version: "1.0.0",
Nodes: []*registry.Node{
&registry.Node{
Id: "test-1",
Address: "localhost",
Metadata: map[string]string{
"foo": "bar",
},
},
},
},
&registry.Service{
Name: "test",
Version: "1.1.0",
Nodes: []*registry.Node{
&registry.Node{
Id: "test-2",
Address: "localhost",
Metadata: map[string]string{
"foo": "baz",
},
},
},
},
},
label: [2]string{"foo", "bar"},
count: 1,
},
{
services: []*registry.Service{
&registry.Service{
Name: "test",
Version: "1.0.0",
Nodes: []*registry.Node{
&registry.Node{
Id: "test-1",
Address: "localhost",
},
},
},
&registry.Service{
Name: "test",
Version: "1.1.0",
Nodes: []*registry.Node{
&registry.Node{
Id: "test-2",
Address: "localhost",
},
},
},
},
label: [2]string{"foo", "bar"},
count: 0,
},
}
for _, data := range testData {
filter := FilterLabel(data.label[0], data.label[1])
services := filter(data.services)
if len(services) != data.count {
t.Fatalf("Expected %d services, got %d", data.count, len(services))
}
for _, service := range services {
var seen bool
for _, node := range service.Nodes {
if node.Metadata[data.label[0]] != data.label[1] {
t.Fatal("Expected %s=%s but got %s=%s for service %+v node %+v",
data.label[0], data.label[1], data.label[0], node.Metadata[data.label[0]], service, node)
}
seen = true
}
if !seen {
t.Fatalf("Expected node for %s=%s but saw none; results %+v", data.label[0], data.label[1], service)
}
}
}
}
func TestFilterVersion(t *testing.T) {
testData := []struct {
services []*registry.Service
version string
count int
}{
{
services: []*registry.Service{
&registry.Service{
Name: "test",
Version: "1.0.0",
},
&registry.Service{
Name: "test",
Version: "1.1.0",
},
},
version: "1.0.0",
count: 1,
},
{
services: []*registry.Service{
&registry.Service{
Name: "test",
Version: "1.0.0",
},
&registry.Service{
Name: "test",
Version: "1.1.0",
},
},
version: "2.0.0",
count: 0,
},
}
for _, data := range testData {
filter := FilterVersion(data.version)
services := filter(data.services)
if len(services) != data.count {
t.Fatalf("Expected %d services, got %d", data.count, len(services))
}
var seen bool
for _, service := range services {
if service.Version != data.version {
t.Fatalf("Expected version %s, got %s", data.version, service.Version)
}
seen = true
}
if seen == false && data.count > 0 {
t.Fatalf("Expected %d services but seen is %t; result %+v", data.count, seen, services)
}
}
}

8
selector/options.go
View File

@ -15,7 +15,7 @@ type Options struct {
}
type SelectOptions struct {
Filters []SelectFilter
Filters []Filter
// Other options for implementations of the interface
// can be stored in a context
@ -35,10 +35,10 @@ func Registry(r registry.Registry) Option {
}
}
// Filter adds a filter function to the list of filters
// WithFilter adds a filter function to the list of filters
// used during the Select call.
func Filter(fn SelectFilter) SelectOption {
func WithFilter(fn ...Filter) SelectOption {
return func(o *SelectOptions) {
o.Filters = append(o.Filters, fn)
o.Filters = append(o.Filters, fn...)
}
}

4
selector/selector.go
View File

@ -82,8 +82,8 @@ type Selector interface {
// based on the selector's algorithm
type Next func() (*registry.Node, error)
// SelectFilter is used to filter a service during the selection process
type SelectFilter func([]*registry.Service) []*registry.Service
// Filter is used to filter a service during the selection process
type Filter func([]*registry.Service) []*registry.Service
var (
DefaultSelector = newRandomSelector()