micro/cmd/cmd.go

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package cmd
import (
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"bytes"
"encoding/json"
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"flag"
"fmt"
"io"
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"math/rand"
"net/http"
"os"
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"runtime"
"strings"
"text/tabwriter"
"text/template"
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"time"
"github.com/codegangsta/cli"
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"github.com/micro/go-micro/broker"
"github.com/micro/go-micro/client"
"github.com/micro/go-micro/registry"
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"github.com/micro/go-micro/selector"
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"github.com/micro/go-micro/server"
"github.com/micro/go-micro/transport"
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"github.com/pborman/uuid"
)
var (
Flags = []cli.Flag{
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cli.StringFlag{
Name: "server_name",
EnvVar: "MICRO_SERVER_NAME",
Usage: "Name of the server. go.micro.srv.example",
},
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cli.StringFlag{
Name: "server_version",
EnvVar: "MICRO_SERVER_VERSION",
Usage: "Version of the server. 1.1.0",
},
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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",
},
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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",
},
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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",
},
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cli.StringFlag{
Name: "selector",
EnvVar: "MICRO_SELECTOR",
Value: "selector",
Usage: "Selector used to pick nodes for querying. random, roundrobin, blacklist",
},
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cli.StringFlag{
Name: "transport",
EnvVar: "MICRO_TRANSPORT",
Value: "http",
Usage: "Transport mechanism used; http, rabbitmq, nats",
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},
cli.StringFlag{
Name: "transport_address",
EnvVar: "MICRO_TRANSPORT_ADDRESS",
Usage: "Comma-separated list of transport addresses",
},
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cli.BoolFlag{
Name: "disable_ping",
EnvVar: "MICRO_DISABLE_PING",
Usage: "Disable ping",
},
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// 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{
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"http": broker.NewBroker,
}
Registries = map[string]func([]string, ...registry.Option) registry.Registry{
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"consul": registry.NewRegistry,
}
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Selectors = map[string]func(...selector.Option) selector.Selector{
"random": selector.NewSelector,
}
Transports = map[string]func([]string, ...transport.Option) transport.Transport{
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"http": transport.NewTransport,
}
)
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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"), ","))
}
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if s, ok := Selectors[c.String("selector")]; ok {
selector.DefaultSelector = s(selector.Registry(registry.DefaultRegistry))
}
if t, ok := Transports[c.String("transport")]; ok {
transport.DefaultTransport = t(strings.Split(c.String("transport_address"), ","))
}
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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")),
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server.Version(c.String("server_version")),
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server.Id(c.String("server_id")),
server.Address(c.String("server_address")),
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server.Advertise(c.String("server_advertise")),
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server.Metadata(metadata),
)
client.DefaultClient = client.NewClient()
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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()
}