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Asim 2016-01-02 00:38:57 +00:00
parent 59a667130c
commit 1f1bc27421
8 changed files with 329 additions and 131 deletions
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159
README.md
View File

@ -27,7 +27,7 @@ By default go-micro only provides a single implementation of each interface. Plu
## Prerequisites
Consul is the default discovery mechanism provided in go-micro. Discovery is however pluggable.
Consul is the default discovery mechanism provided in go-micro. Discovery is however pluggable so you can used etcd, kubernetes, zookeeper, etc.
### Install Consul
[https://www.consul.io/intro/getting-started/install.html](https://www.consul.io/intro/getting-started/install.html)
@ -41,104 +41,141 @@ $ consul agent -server -bootstrap-expect 1 -data-dir /tmp/consul
### Run Service
```
$ go run examples/server/main.go --logtostderr
I1108 11:08:19.926071 11358 server.go:96] Starting server go.micro.srv.example id go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
I1108 11:08:19.926407 11358 rpc_server.go:233] Listening on [::]:54080
I1108 11:08:19.926500 11358 http_broker.go:80] Broker Listening on [::]:54081
I1108 11:08:19.926632 11358 rpc_server.go:158] Registering node: go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
$ go run examples/service/main.go --logtostderr
I0102 00:22:26.413467 12018 rpc_server.go:297] Listening on [::]:62492
I0102 00:22:26.413803 12018 http_broker.go:115] Broker Listening on [::]:62493
I0102 00:22:26.414009 12018 rpc_server.go:212] Registering node: greeter-e6b2fc6f-b0e6-11e5-a42f-68a86d0d36b6
```
### Test Service
```
$ go run examples/client/main.go
go.micro.srv.example-59b6e0ab-0300-11e5-b696-68a86d0d36b6: Hello John
$ go run examples/service/main.go --client
Hello John
```
## Writing a service
### Create request/response proto
`go-micro/examples/server/proto/example/example.proto`:
`go-micro/examples/service/proto/greeter.proto`:
```
syntax = "proto3";
message Request {
service Greeter {
rpc Hello(HelloRequest) returns (HelloResponse) {}
}
message HelloRequest {
string name = 1;
}
message Response {
string msg = 1;
message HelloResponse {
string greeting = 2;
}
```
Compile proto `protoc -I$GOPATH/src --go_out=$GOPATH/src $GOPATH/src/github.com/micro/go-micro/examples/server/proto/example/example.proto`
### Install protobuf for code generation
### Create request handler
`go-micro/examples/server/handler/example.go`:
We use a protobuf plugin for code generation. This is completely optional. Look at [examples/server](https://github.com/micro/go-micro/blob/master/examples/server/main.go)
and [examples/client](https://github.com/micro/go-micro/blob/master/examples/client/main.go) for examples without code generation.
```go
package handler
import (
log "github.com/golang/glog"
c "github.com/micro/go-micro/context"
example "github.com/micro/go-micro/examples/server/proto/example"
"github.com/micro/go-micro/server"
"golang.org/x/net/context"
)
type Example struct{}
func (e *Example) Call(ctx context.Context, req *example.Request, rsp *example.Response) error {
md, _ := c.GetMetadata(ctx)
log.Infof("Received Example.Call request with metadata: %v", md)
rsp.Msg = server.Options().Id + ": Hello " + req.Name
return nil
}
```shell
go get github.com/micro/protobuf
```
### Init server
`go-micro/examples/server/main.go`:
Compile proto `protoc -I$GOPATH/src --go_out=plugins=micro:$GOPATH/src $GOPATH/src/github.com/micro/go-micro/examples/service/proto/greeter.proto`
### Define the service
`go-micro/examples/service/main.go`:
```go
package main
import (
log "github.com/golang/glog"
"github.com/micro/go-micro/cmd"
"github.com/micro/go-micro/examples/server/handler"
"github.com/micro/go-micro/server"
"fmt"
micro "github.com/micro/go-micro"
proto "github.com/micro/go-micro/examples/service/proto"
"golang.org/x/net/context"
)
type Greeter struct{}
func (g *Greeter) Hello(ctx context.Context, req *proto.HelloRequest, rsp *proto.HelloResponse) error {
rsp.Greeting = "Hello " + req.Name
return nil
}
func main() {
// optionally setup command line usage
cmd.Init()
// Initialise Server
server.Init(
server.Name("go.micro.srv.example"),
// Create a new service. Optionally include some options here.
service := micro.NewService(
micro.Name("greeter"),
micro.Version("latest"),
micro.Metadata(map[string]string{
"type": "helloworld",
}),
)
// Register Handlers
server.Handle(
server.NewHandler(
new(handler.Example),
),
)
// Init will parse the command line flags. Any flags set will
// override the above settings. Options defined here will
// override anything set on the command line.
service.Init()
// Run server
if err := server.Run(); err != nil {
log.Fatal(err)
// Register handler
proto.RegisterGreeterHandler(service.Server(), new(Greeter))
// Run the server
if err := service.Run(); err != nil {
fmt.Println(err)
}
}
```
### Run service
```
$ go run examples/server/main.go --logtostderr
I1108 11:08:19.926071 11358 server.go:96] Starting server go.micro.srv.example id go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
I1108 11:08:19.926407 11358 rpc_server.go:233] Listening on [::]:54080
I1108 11:08:19.926500 11358 http_broker.go:80] Broker Listening on [::]:54081
I1108 11:08:19.926632 11358 rpc_server.go:158] Registering node: go.micro.srv.example-04de4cf0-8609-11e5-bf3a-68a86d0d36b6
go run examples/service/main.go --logtostderr
I0102 00:22:26.413467 12018 rpc_server.go:297] Listening on [::]:62492
I0102 00:22:26.413803 12018 http_broker.go:115] Broker Listening on [::]:62493
I0102 00:22:26.414009 12018 rpc_server.go:212] Registering node: greeter-e6b2fc6f-b0e6-11e5-a42f-68a86d0d36b6
```
### Define a client
`client.go`
```go
package main
import (
"fmt"
micro "github.com/micro/go-micro"
proto "github.com/micro/go-micro/examples/service/proto"
"golang.org/x/net/context"
)
func main() {
// Create a new service. Optionally include some options here.
service := micro.NewService(micro.Name("greeter.client"))
// Create new greeter client
greeter := proto.NewGreeterClient("greeter", service.Client())
// Call the greeter
rsp, err := greeter.Hello(context.TODO(), &proto.HelloRequest{Name: "John"})
if err != nil {
fmt.Println(err)
}
// Print response
fmt.Println(rsp.Greeting)
}
```
### Run the client
```shell
go run client.go
Hello John
```

103
cmd/cmd.go
View File

@ -57,7 +57,6 @@ var (
cli.StringFlag{
Name: "server_address",
EnvVar: "MICRO_SERVER_ADDRESS",
Value: ":0",
Usage: "Bind address for the server. 127.0.0.1:8080",
},
cli.StringFlag{
@ -74,7 +73,6 @@ var (
cli.StringFlag{
Name: "broker",
EnvVar: "MICRO_BROKER",
Value: "http",
Usage: "Broker for pub/sub. http, nats, rabbitmq",
},
cli.StringFlag{
@ -85,7 +83,6 @@ var (
cli.StringFlag{
Name: "registry",
EnvVar: "MICRO_REGISTRY",
Value: "consul",
Usage: "Registry for discovery. memory, consul, etcd, kubernetes",
},
cli.StringFlag{
@ -96,13 +93,11 @@ var (
cli.StringFlag{
Name: "selector",
EnvVar: "MICRO_SELECTOR",
Value: "selector",
Usage: "Selector used to pick nodes for querying. random, roundrobin, blacklist",
},
cli.StringFlag{
Name: "transport",
EnvVar: "MICRO_TRANSPORT",
Value: "http",
Usage: "Transport mechanism used; http, rabbitmq, nats",
},
cli.StringFlag{
@ -170,6 +165,13 @@ func init() {
func newCmd(opts ...Option) Cmd {
options := Options{
Broker: &broker.DefaultBroker,
Client: &client.DefaultClient,
Registry: &registry.DefaultRegistry,
Server: &server.DefaultServer,
Selector: &selector.DefaultSelector,
Transport: &transport.DefaultTransport,
Brokers: DefaultBrokers,
Registries: DefaultRegistries,
Selectors: DefaultSelectors,
@ -221,22 +223,63 @@ func (c *cmd) Before(ctx *cli.Context) error {
flag.Set("v", ctx.String("v"))
flag.Parse()
// If flags are set then use them otherwise do nothing
var serverOpts []server.Option
var clientOpts []client.Option
// Set the broker
if len(ctx.String("broker")) > 0 {
if b, ok := c.opts.Brokers[ctx.String("broker")]; ok {
broker.DefaultBroker = b(strings.Split(ctx.String("broker_address"), ","))
n := b(strings.Split(ctx.String("broker_address"), ","))
c.opts.Broker = &n
} else {
return fmt.Errorf("Broker %s not found", ctx.String("broker"))
}
serverOpts = append(serverOpts, server.Broker(*c.opts.Broker))
clientOpts = append(clientOpts, client.Broker(*c.opts.Broker))
}
// Set the registry
if len(ctx.String("registry")) > 0 {
if r, ok := c.opts.Registries[ctx.String("registry")]; ok {
registry.DefaultRegistry = r(strings.Split(ctx.String("registry_address"), ","))
n := r(strings.Split(ctx.String("registry_address"), ","))
c.opts.Registry = &n
} else {
return fmt.Errorf("Registry %s not found", ctx.String("registry"))
}
serverOpts = append(serverOpts, server.Registry(*c.opts.Registry))
clientOpts = append(clientOpts, client.Registry(*c.opts.Registry))
}
// Set the selector
if len(ctx.String("selector")) > 0 {
if s, ok := c.opts.Selectors[ctx.String("selector")]; ok {
selector.DefaultSelector = s(selector.Registry(registry.DefaultRegistry))
n := s(selector.Registry(*c.opts.Registry))
c.opts.Selector = &n
} else {
return fmt.Errorf("Selector %s not found", ctx.String("selector"))
}
// No server option here. Should there be?
clientOpts = append(clientOpts, client.Selector(*c.opts.Selector))
}
// Set the transport
if len(ctx.String("transport")) > 0 {
if t, ok := c.opts.Transports[ctx.String("transport")]; ok {
transport.DefaultTransport = t(strings.Split(ctx.String("transport_address"), ","))
n := t(strings.Split(ctx.String("transport_address"), ","))
c.opts.Transport = &n
} else {
return fmt.Errorf("Transport %s not found", ctx.String("transport"))
}
serverOpts = append(serverOpts, server.Transport(*c.opts.Transport))
clientOpts = append(clientOpts, client.Transport(*c.opts.Transport))
}
// Parse the server options
metadata := make(map[string]string)
for _, d := range ctx.StringSlice("server_metadata") {
var key, val string
@ -248,16 +291,40 @@ func (c *cmd) Before(ctx *cli.Context) error {
metadata[key] = val
}
server.DefaultServer = server.NewServer(
server.Name(ctx.String("server_name")),
server.Version(ctx.String("server_version")),
server.Id(ctx.String("server_id")),
server.Address(ctx.String("server_address")),
server.Advertise(ctx.String("server_advertise")),
server.Metadata(metadata),
)
if len(metadata) > 0 {
serverOpts = append(serverOpts, server.Metadata(metadata))
}
client.DefaultClient = client.NewClient()
if len(ctx.String("server_name")) > 0 {
serverOpts = append(serverOpts, server.Name(ctx.String("server_name")))
}
if len(ctx.String("server_version")) > 0 {
serverOpts = append(serverOpts, server.Version(ctx.String("server_version")))
}
if len(ctx.String("server_id")) > 0 {
serverOpts = append(serverOpts, server.Id(ctx.String("server_id")))
}
if len(ctx.String("server_address")) > 0 {
serverOpts = append(serverOpts, server.Address(ctx.String("server_address")))
}
if len(ctx.String("server_advertise")) > 0 {
serverOpts = append(serverOpts, server.Advertise(ctx.String("server_advertise")))
}
// We have some command line opts for the server.
// Lets set it up
if len(serverOpts) > 0 {
(*c.opts.Server).Init(serverOpts...)
}
// Use an init option?
if len(clientOpts) > 0 {
*c.opts.Client = client.NewClient(clientOpts...)
}
return nil
}

62
cmd/options.go
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@ -2,59 +2,113 @@ package cmd
import (
"github.com/micro/go-micro/broker"
"github.com/micro/go-micro/client"
"github.com/micro/go-micro/registry"
"github.com/micro/go-micro/selector"
"github.com/micro/go-micro/server"
"github.com/micro/go-micro/transport"
)
type Options struct {
// For the Command Line itself
Name string
Description string
Version string
// We need pointers to things so we can swap them out if needed.
Broker *broker.Broker
Registry *registry.Registry
Selector *selector.Selector
Transport *transport.Transport
Client *client.Client
Server *server.Server
Brokers map[string]func([]string, ...broker.Option) broker.Broker
Registries map[string]func([]string, ...registry.Option) registry.Registry
Selectors map[string]func(...selector.Option) selector.Selector
Transports map[string]func([]string, ...transport.Option) transport.Transport
}
// Command line Name
func Name(n string) Option {
return func(o *Options) {
o.Name = n
}
}
// Command line Description
func Description(d string) Option {
return func(o *Options) {
o.Description = d
}
}
// Command line Version
func Version(v string) Option {
return func(o *Options) {
o.Version = v
}
}
func Broker(name string, b func([]string, ...broker.Option) broker.Broker) Option {
func Broker(b *broker.Broker) Option {
return func(o *Options) {
o.Broker = b
}
}
func Selector(s *selector.Selector) Option {
return func(o *Options) {
o.Selector = s
}
}
func Registry(r *registry.Registry) Option {
return func(o *Options) {
o.Registry = r
}
}
func Transport(t *transport.Transport) Option {
return func(o *Options) {
o.Transport = t
}
}
func Client(c *client.Client) Option {
return func(o *Options) {
o.Client = c
}
}
func Server(s *server.Server) Option {
return func(o *Options) {
o.Server = s
}
}
// New broker func
func NewBroker(name string, b func([]string, ...broker.Option) broker.Broker) Option {
return func(o *Options) {
o.Brokers[name] = b
}
}
func Registry(name string, r func([]string, ...registry.Option) registry.Registry) Option {
// New registry func
func NewRegistry(name string, r func([]string, ...registry.Option) registry.Registry) Option {
return func(o *Options) {
o.Registries[name] = r
}
}
func Selector(name string, s func(...selector.Option) selector.Selector) Option {
// New selector func
func NewSelector(name string, s func(...selector.Option) selector.Selector) Option {
return func(o *Options) {
o.Selectors[name] = s
}
}
func Transport(name string, t func([]string, ...transport.Option) transport.Transport) Option {
// New transport func
func NewTransport(name string, t func([]string, ...transport.Option) transport.Transport) Option {
return func(o *Options) {
o.Transports[name] = t
}

28
examples/server/main.go
View File

@ -6,40 +6,12 @@ import (
"github.com/micro/go-micro/examples/server/handler"
"github.com/micro/go-micro/examples/server/subscriber"
"github.com/micro/go-micro/server"
"golang.org/x/net/context"
)
func logWrapper(fn server.HandlerFunc) server.HandlerFunc {
return func(ctx context.Context, req server.Request, rsp interface{}) error {
log.Infof("[Log Wrapper] Before serving request method: %v", req.Method())
err := fn(ctx, req, rsp)
log.Infof("[Log Wrapper] After serving request")
return err
}
}
func logSubWrapper(fn server.SubscriberFunc) server.SubscriberFunc {
return func(ctx context.Context, req server.Publication) error {
log.Infof("[Log Sub Wrapper] Before serving publication topic: %v", req.Topic())
err := fn(ctx, req)
log.Infof("[Log Sub Wrapper] After serving publication")
return err
}
}
func main() {
// optionally setup command line usage
cmd.Init()
md := server.DefaultOptions().Metadata
md["datacenter"] = "local"
server.DefaultServer = server.NewServer(
server.WrapHandler(logWrapper),
server.WrapSubscriber(logSubWrapper),
server.Metadata(md),
)
// Initialise Server
server.Init(
server.Name("go.micro.srv.example"),

78
examples/server/wrapper/main.go Normal file
View File

@ -0,0 +1,78 @@
package main
import (
log "github.com/golang/glog"
"github.com/micro/go-micro/cmd"
"github.com/micro/go-micro/examples/server/handler"
"github.com/micro/go-micro/examples/server/subscriber"
"github.com/micro/go-micro/server"
"golang.org/x/net/context"
)
func logWrapper(fn server.HandlerFunc) server.HandlerFunc {
return func(ctx context.Context, req server.Request, rsp interface{}) error {
log.Infof("[Log Wrapper] Before serving request method: %v", req.Method())
err := fn(ctx, req, rsp)
log.Infof("[Log Wrapper] After serving request")
return err
}
}
func logSubWrapper(fn server.SubscriberFunc) server.SubscriberFunc {
return func(ctx context.Context, req server.Publication) error {
log.Infof("[Log Sub Wrapper] Before serving publication topic: %v", req.Topic())
err := fn(ctx, req)
log.Infof("[Log Sub Wrapper] After serving publication")
return err
}
}
func main() {
// optionally setup command line usage
cmd.Init()
md := server.DefaultOptions().Metadata
md["datacenter"] = "local"
server.DefaultServer = server.NewServer(
server.WrapHandler(logWrapper),
server.WrapSubscriber(logSubWrapper),
server.Metadata(md),
)
// Initialise Server
server.Init(
server.Name("go.micro.srv.example"),
)
// Register Handlers
server.Handle(
server.NewHandler(
new(handler.Example),
),
)
// Register Subscribers
if err := server.Subscribe(
server.NewSubscriber(
"topic.go.micro.srv.example",
new(subscriber.Example),
),
); err != nil {
log.Fatal(err)
}
if err := server.Subscribe(
server.NewSubscriber(
"topic.go.micro.srv.example",
subscriber.Handler,
),
); err != nil {
log.Fatal(err)
}
// Run server
if err := server.Run(); err != nil {
log.Fatal(err)
}
}

9
options.go
View File

@ -28,6 +28,7 @@ type Options struct {
func newOptions(opts ...Option) Options {
opt := Options{
Broker: broker.DefaultBroker,
Cmd: cmd.DefaultCmd,
Client: client.DefaultClient,
Server: server.DefaultServer,
Registry: registry.DefaultRegistry,
@ -39,14 +40,6 @@ func newOptions(opts ...Option) Options {
o(&opt)
}
// New Command
if opt.Cmd == nil {
opt.Cmd = cmd.NewCmd(
cmd.Name(opt.Server.Options().Name),
cmd.Version(opt.Server.Options().Version),
)
}
return opt
}

7
server/rpc_server.go
View File

@ -110,9 +110,6 @@ func (s *rpcServer) Init(opts ...Option) {
for _, opt := range opts {
opt(&s.opts)
}
if len(s.opts.Id) == 0 {
s.opts.Id = s.opts.Name + "-" + DefaultId
}
s.Unlock()
}
@ -187,7 +184,7 @@ func (s *rpcServer) Register() error {
// register service
node := &registry.Node{
Id: config.Id,
Id: config.Name + "-" + config.Id,
Address: addr,
Port: port,
Metadata: config.Metadata,
@ -260,7 +257,7 @@ func (s *rpcServer) Deregister() error {
}
node := &registry.Node{
Id: config.Id,
Id: config.Name + "-" + config.Id,
Address: addr,
Port: port,
}

4
service.go
View File

@ -31,13 +31,13 @@ func newService(opts ...Option) Service {
}
func (s *service) Init(opts ...Option) {
// Initialise the command flags, overriding new service
s.opts.Cmd.Init()
// Update any options to override command flags
for _, o := range opts {
o(&s.opts)
}
s = newService(opts...).(*service)
}
func (s *service) Cmd() cmd.Cmd {