package cmd import ( "bytes" "encoding/json" "flag" "fmt" "io" "math/rand" "net/http" "os" "runtime" "strings" "text/tabwriter" "text/template" "time" "github.com/codegangsta/cli" "github.com/micro/go-micro/broker" "github.com/micro/go-micro/client" "github.com/micro/go-micro/registry" "github.com/micro/go-micro/server" "github.com/micro/go-micro/transport" "github.com/pborman/uuid" ) var ( Flags = []cli.Flag{ cli.StringFlag{ Name: "server_name", EnvVar: "MICRO_SERVER_NAME", Usage: "Name of the server. go.micro.srv.example", }, cli.StringFlag{ Name: "server_version", EnvVar: "MICRO_SERVER_VERSION", Usage: "Version of the server. 1.1.0", }, cli.StringFlag{ Name: "server_id", EnvVar: "MICRO_SERVER_ID", Usage: "Id of the server. Auto-generated if not specified", }, cli.StringFlag{ Name: "server_address", EnvVar: "MICRO_SERVER_ADDRESS", Value: ":0", Usage: "Bind address for the server. 127.0.0.1:8080", }, cli.StringFlag{ Name: "server_advertise", EnvVar: "MICRO_SERVER_ADVERTISE", Usage: "Used instead of the server_address when registering with discovery. 127.0.0.1:8080", }, cli.StringSliceFlag{ Name: "server_metadata", EnvVar: "MICRO_SERVER_METADATA", Value: &cli.StringSlice{}, Usage: "A list of key-value pairs defining metadata. version=1.0.0", }, cli.StringFlag{ Name: "broker", EnvVar: "MICRO_BROKER", Value: "http", Usage: "Broker for pub/sub. http, nats, rabbitmq", }, cli.StringFlag{ Name: "broker_address", EnvVar: "MICRO_BROKER_ADDRESS", Usage: "Comma-separated list of broker addresses", }, cli.StringFlag{ Name: "registry", EnvVar: "MICRO_REGISTRY", Value: "consul", Usage: "Registry for discovery. memory, consul, etcd, kubernetes", }, cli.StringFlag{ Name: "registry_address", EnvVar: "MICRO_REGISTRY_ADDRESS", Usage: "Comma-separated list of registry addresses", }, cli.StringFlag{ Name: "transport", EnvVar: "MICRO_TRANSPORT", Value: "http", Usage: "Transport mechanism used; http, rabbitmq, nats", }, cli.StringFlag{ Name: "transport_address", EnvVar: "MICRO_TRANSPORT_ADDRESS", Usage: "Comma-separated list of transport addresses", }, cli.BoolFlag{ Name: "disable_ping", EnvVar: "MICRO_DISABLE_PING", Usage: "Disable ping", }, // logging flags cli.BoolFlag{ Name: "logtostderr", Usage: "log to standard error instead of files", }, cli.BoolFlag{ Name: "alsologtostderr", Usage: "log to standard error as well as files", }, cli.StringFlag{ Name: "log_dir", Usage: "log files will be written to this directory instead of the default temporary directory", }, cli.StringFlag{ Name: "stderrthreshold", Usage: "logs at or above this threshold go to stderr", }, cli.StringFlag{ Name: "v", Usage: "log level for V logs", }, cli.StringFlag{ Name: "vmodule", Usage: "comma-separated list of pattern=N settings for file-filtered logging", }, cli.StringFlag{ Name: "log_backtrace_at", Usage: "when logging hits line file:N, emit a stack trace", }, } Brokers = map[string]func([]string, ...broker.Option) broker.Broker{ "http": broker.NewBroker, } Registries = map[string]func([]string, ...registry.Option) registry.Registry{ "consul": registry.NewRegistry, } Transports = map[string]func([]string, ...transport.Option) transport.Transport{ "http": transport.NewTransport, } ) func init() { rand.Seed(time.Now().Unix()) } // ping informs micro-services about this thing func ping() { type Ping struct { Id string Timestamp int64 Product string Version string Arch string Os string } p := Ping{ Id: uuid.NewUUID().String(), Product: "go-micro", Version: "latest", Arch: runtime.GOARCH, Os: runtime.GOOS, } buf := bytes.NewBuffer(nil) cl := &http.Client{} fn := func() { p.Timestamp = time.Now().Unix() b, err := json.Marshal(p) if err != nil { return } buf.Reset() buf.Write(b) rsp, err := cl.Post("https://micro-services.co/_ping", "application/json", buf) if err != nil { return } rsp.Body.Close() } // don't ping unless this thing has lived for 30 seconds time.Sleep(time.Second * 30) // only ping every 24 hours, be non invasive for { fn() time.Sleep(time.Hour * 24) } } func Setup(c *cli.Context) error { os.Args = os.Args[:1] flag.Set("logtostderr", fmt.Sprintf("%v", c.Bool("logtostderr"))) flag.Set("alsologtostderr", fmt.Sprintf("%v", c.Bool("alsologtostderr"))) flag.Set("stderrthreshold", c.String("stderrthreshold")) flag.Set("log_backtrace_at", c.String("log_backtrace_at")) flag.Set("log_dir", c.String("log_dir")) flag.Set("vmodule", c.String("vmodule")) flag.Set("v", c.String("v")) flag.Parse() if b, ok := Brokers[c.String("broker")]; ok { broker.DefaultBroker = b(strings.Split(c.String("broker_address"), ",")) } if r, ok := Registries[c.String("registry")]; ok { registry.DefaultRegistry = r(strings.Split(c.String("registry_address"), ",")) } if t, ok := Transports[c.String("transport")]; ok { transport.DefaultTransport = t(strings.Split(c.String("transport_address"), ",")) } metadata := make(map[string]string) for _, d := range c.StringSlice("server_metadata") { var key, val string parts := strings.Split(d, "=") key = parts[0] if len(parts) > 1 { val = strings.Join(parts[1:], "=") } metadata[key] = val } server.DefaultServer = server.NewServer( server.Name(c.String("server_name")), server.Version(c.String("server_version")), server.Id(c.String("server_id")), server.Address(c.String("server_address")), server.Advertise(c.String("server_advertise")), server.Metadata(metadata), ) client.DefaultClient = client.NewClient() if !c.Bool("disable_ping") { go ping() } return nil } func Init() { cli.AppHelpTemplate = ` GLOBAL OPTIONS: {{range .Flags}}{{.}} {{end}} ` cli.HelpPrinter = func(writer io.Writer, templ string, data interface{}) { w := tabwriter.NewWriter(os.Stdout, 0, 8, 1, '\t', 0) t := template.Must(template.New("help").Parse(templ)) err := t.Execute(w, data) if err != nil { panic(err) } w.Flush() os.Exit(2) } app := cli.NewApp() app.HideVersion = true app.Usage = "a go micro app" app.Action = func(c *cli.Context) {} app.Before = Setup app.Flags = Flags app.RunAndExitOnError() }