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First commit in strategy rework

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Asim 2016-05-03 22:06:19 +01:00
parent b13361d010
commit 0a4484b406
11 changed files with 235 additions and 284 deletions
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38
selector/cache/cache.go vendored
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@ -2,7 +2,6 @@ package cache
import (
"log"
"math/rand"
"sync"
"time"
@ -33,10 +32,6 @@ var (
DefaultTTL = time.Minute
)
func init() {
rand.Seed(time.Now().UnixNano())
}
func (c *cacheSelector) quit() bool {
select {
case <-c.exit:
@ -329,7 +324,10 @@ func (c *cacheSelector) Options() selector.Options {
}
func (c *cacheSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
var sopts selector.SelectOptions
sopts := selector.SelectOptions{
Strategy: c.so.Strategy,
}
for _, opt := range opts {
opt(&sopts)
}
@ -352,29 +350,7 @@ func (c *cacheSelector) Select(service string, opts ...selector.SelectOption) (s
return nil, selector.ErrNotFound
}
var nodes []*registry.Node
for _, service := range services {
for _, node := range service.Nodes {
nodes = append(nodes, node)
}
}
if len(nodes) == 0 {
return nil, selector.ErrNotFound
}
return func() (*registry.Node, error) {
i := rand.Int()
j := i % len(services)
if len(services[j].Nodes) == 0 {
return nil, selector.ErrNotFound
}
k := i % len(services[j].Nodes)
return services[j].Nodes[k], nil
}, nil
return sopts.Strategy(services), nil
}
func (c *cacheSelector) Mark(service string, node *registry.Node, err error) {
@ -407,7 +383,9 @@ func (c *cacheSelector) String() string {
}
func NewSelector(opts ...selector.Option) selector.Selector {
var sopts selector.Options
sopts := selector.Options{
Strategy: selector.Random,
}
for _, opt := range opts {
opt(&sopts)

87
selector/default.go Normal file
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@ -0,0 +1,87 @@
package selector
import (
"math/rand"
"time"
"github.com/micro/go-micro/registry"
)
type defaultSelector struct {
so Options
}
func init() {
rand.Seed(time.Now().Unix())
}
func (r *defaultSelector) Init(opts ...Option) error {
for _, o := range opts {
o(&r.so)
}
return nil
}
func (r *defaultSelector) Options() Options {
return r.so
}
func (r *defaultSelector) Select(service string, opts ...SelectOption) (Next, error) {
sopts := SelectOptions{
Strategy: r.so.Strategy,
}
for _, opt := range opts {
opt(&sopts)
}
// get the service
services, err := r.so.Registry.GetService(service)
if err != nil {
return nil, err
}
// apply the filters
for _, filter := range sopts.Filters {
services = filter(services)
}
// if there's nothing left, return
if len(services) == 0 {
return nil, ErrNotFound
}
return sopts.Strategy(services), nil
}
func (r *defaultSelector) Mark(service string, node *registry.Node, err error) {
return
}
func (r *defaultSelector) Reset(service string) {
return
}
func (r *defaultSelector) Close() error {
return nil
}
func (r *defaultSelector) String() string {
return "default"
}
func newDefaultSelector(opts ...Option) Selector {
sopts := Options{
Strategy: Random,
}
for _, opt := range opts {
opt(&sopts)
}
if sopts.Registry == nil {
sopts.Registry = registry.DefaultRegistry
}
return &defaultSelector{sopts}
}

8
selector/random_selector_test.go → selector/default_test.go
View File

@ -9,15 +9,11 @@ import (
func TestRandomSelector(t *testing.T) {
counts := map[string]int{}
rs := &randomSelector{
so: Options{
Registry: mock.NewRegistry(),
},
}
rs := newDefaultSelector(Registry(mock.NewRegistry()))
next, err := rs.Select("foo")
if err != nil {
t.Errorf("Unexpected error calling random select: %v", err)
t.Errorf("Unexpected error calling default select: %v", err)
}
for i := 0; i < 100; i++ {

18
selector/options.go
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@ -8,6 +8,7 @@ import (
type Options struct {
Registry registry.Registry
Strategy Strategy
// Other options for implementations of the interface
// can be stored in a context
@ -15,7 +16,8 @@ type Options struct {
}
type SelectOptions struct {
Filters []Filter
Filters []Filter
Strategy Strategy
// Other options for implementations of the interface
// can be stored in a context
@ -35,6 +37,13 @@ func Registry(r registry.Registry) Option {
}
}
// SetStrategy sets the default strategy for the selector
func SetStrategy(fn Strategy) Option {
return func(o *Options) {
o.Strategy = fn
}
}
// WithFilter adds a filter function to the list of filters
// used during the Select call.
func WithFilter(fn ...Filter) SelectOption {
@ -42,3 +51,10 @@ func WithFilter(fn ...Filter) SelectOption {
o.Filters = append(o.Filters, fn...)
}
}
// Strategy sets the selector strategy
func WithStrategy(fn Strategy) SelectOption {
return func(o *SelectOptions) {
o.Strategy = fn
}
}

9
selector/random/random.go
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@ -1,9 +0,0 @@
package random
import (
"github.com/micro/go-micro/selector"
)
func NewSelector(opts ...selector.Option) selector.Selector {
return selector.NewSelector(opts...)
}

104
selector/random_selector.go
View File

@ -1,104 +0,0 @@
package selector
import (
"math/rand"
"time"
"github.com/micro/go-micro/registry"
)
type randomSelector struct {
so Options
}
func init() {
rand.Seed(time.Now().Unix())
}
func (r *randomSelector) Init(opts ...Option) error {
for _, o := range opts {
o(&r.so)
}
return nil
}
func (r *randomSelector) Options() Options {
return r.so
}
func (r *randomSelector) Select(service string, opts ...SelectOption) (Next, error) {
var sopts SelectOptions
for _, opt := range opts {
opt(&sopts)
}
// get the service
services, err := r.so.Registry.GetService(service)
if err != nil {
return nil, err
}
// apply the filters
for _, filter := range sopts.Filters {
services = filter(services)
}
// if there's nothing left, return
if len(services) == 0 {
return nil, ErrNotFound
}
var nodes []*registry.Node
for _, service := range services {
for _, node := range service.Nodes {
nodes = append(nodes, node)
}
}
if len(nodes) == 0 {
return nil, ErrNotFound
}
return func() (*registry.Node, error) {
i := rand.Int()
j := i % len(services)
if len(services[j].Nodes) == 0 {
return nil, ErrNotFound
}
k := i % len(services[j].Nodes)
return services[j].Nodes[k], nil
}, nil
}
func (r *randomSelector) Mark(service string, node *registry.Node, err error) {
return
}
func (r *randomSelector) Reset(service string) {
return
}
func (r *randomSelector) Close() error {
return nil
}
func (r *randomSelector) String() string {
return "random"
}
func newRandomSelector(opts ...Option) Selector {
var sopts Options
for _, opt := range opts {
opt(&sopts)
}
if sopts.Registry == nil {
sopts.Registry = registry.DefaultRegistry
}
return &randomSelector{sopts}
}

98
selector/roundrobin/round_robin_selector.go
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@ -1,98 +0,0 @@
package roundrobin
import (
"sync"
"github.com/micro/go-micro/registry"
"github.com/micro/go-micro/selector"
)
type roundRobinSelector struct {
so selector.Options
}
func (r *roundRobinSelector) Init(opts ...selector.Option) error {
for _, o := range opts {
o(&r.so)
}
return nil
}
func (r *roundRobinSelector) Options() selector.Options {
return r.so
}
func (r *roundRobinSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
var sopts selector.SelectOptions
for _, opt := range opts {
opt(&sopts)
}
// get the service
services, err := r.so.Registry.GetService(service)
if err != nil {
return nil, err
}
// apply the filters
for _, filter := range sopts.Filters {
services = filter(services)
}
// if there's nothing left, return
if len(services) == 0 {
return nil, selector.ErrNotFound
}
var nodes []*registry.Node
for _, service := range services {
for _, node := range service.Nodes {
nodes = append(nodes, node)
}
}
if len(nodes) == 0 {
return nil, selector.ErrNotFound
}
var i int
var mtx sync.Mutex
return func() (*registry.Node, error) {
mtx.Lock()
defer mtx.Unlock()
i++
return nodes[i%len(nodes)], nil
}, nil
}
func (r *roundRobinSelector) Mark(service string, node *registry.Node, err error) {
return
}
func (r *roundRobinSelector) Reset(service string) {
return
}
func (r *roundRobinSelector) Close() error {
return nil
}
func (r *roundRobinSelector) String() string {
return "roundrobin"
}
func NewSelector(opts ...selector.Option) selector.Selector {
var sopts selector.Options
for _, opt := range opts {
opt(&sopts)
}
if sopts.Registry == nil {
sopts.Registry = registry.DefaultRegistry
}
return &roundRobinSelector{sopts}
}

33
selector/roundrobin/round_robin_selector_test.go
View File

@ -1,33 +0,0 @@
package roundrobin
import (
"testing"
"github.com/micro/go-micro/registry/mock"
"github.com/micro/go-micro/selector"
)
func TestRoundRobinSelector(t *testing.T) {
counts := map[string]int{}
rr := &roundRobinSelector{
so: selector.Options{
Registry: mock.NewRegistry(),
},
}
next, err := rr.Select("foo")
if err != nil {
t.Errorf("Unexpected error calling rr select: %v", err)
}
for i := 0; i < 100; i++ {
node, err := next()
if err != nil {
t.Errorf("Expected node err, got err: %v", err)
}
counts[node.Id]++
}
t.Logf("Round Robin Counts %v", counts)
}

9
selector/selector.go
View File

@ -79,19 +79,22 @@ type Selector interface {
}
// Next is a function that returns the next node
// based on the selector's algorithm
// based on the selector's strategy
type Next func() (*registry.Node, error)
// Filter is used to filter a service during the selection process
type Filter func([]*registry.Service) []*registry.Service
// Strategy is a selection strategy e.g random, round robin
type Strategy func([]*registry.Service) Next
var (
DefaultSelector = newRandomSelector()
DefaultSelector = newDefaultSelector()
ErrNotFound = errors.New("not found")
ErrNoneAvailable = errors.New("none available")
)
func NewSelector(opts ...Option) Selector {
return newRandomSelector(opts...)
return newDefaultSelector(opts...)
}

56
selector/strategy.go Normal file
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@ -0,0 +1,56 @@
package selector
import (
"math/rand"
"sync"
"time"
"github.com/micro/go-micro/registry"
)
func init() {
rand.Seed(time.Now().UnixNano())
}
// Random is a random strategy algorithm for node selection
func Random(services []*registry.Service) Next {
var nodes []*registry.Node
for _, service := range services {
nodes = append(nodes, service.Nodes...)
}
return func() (*registry.Node, error) {
if len(nodes) == 0 {
return nil, ErrNotFound
}
i := rand.Int() % len(nodes)
return nodes[i], nil
}
}
// RoundRobin is a roundrobin strategy algorithm for node selection
func RoundRobin(services []*registry.Service) Next {
var nodes []*registry.Node
for _, service := range services {
nodes = append(nodes, service.Nodes...)
}
var i int
var mtx sync.Mutex
return func() (*registry.Node, error) {
if len(nodes) == 0 {
return nil, ErrNotFound
}
mtx.Lock()
node := nodes[i%len(nodes)]
i++
mtx.Unlock()
return node, nil
}
}

59
selector/strategy_test.go Normal file
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@ -0,0 +1,59 @@
package selector
import (
"testing"
"github.com/micro/go-micro/registry"
)
func TestStrategies(t *testing.T) {
testData := []*registry.Service{
&registry.Service{
Name: "test1",
Version: "latest",
Nodes: []*registry.Node{
&registry.Node{
Id: "test1-1",
Address: "10.0.0.1",
Port: 1001,
},
&registry.Node{
Id: "test1-2",
Address: "10.0.0.2",
Port: 1002,
},
},
},
&registry.Service{
Name: "test1",
Version: "default",
Nodes: []*registry.Node{
&registry.Node{
Id: "test1-3",
Address: "10.0.0.3",
Port: 1003,
},
&registry.Node{
Id: "test1-4",
Address: "10.0.0.4",
Port: 1004,
},
},
},
}
for name, strategy := range map[string]Strategy{"random": Random, "roundrobin": RoundRobin} {
next := strategy(testData)
counts := make(map[string]int)
for i := 0; i < 100; i++ {
node, err := next()
if err != nil {
t.Fatal(err)
}
counts[node.Id]++
}
t.Logf("%s: %+v\n", name, counts)
}
}