494 lines
13 KiB
Go
494 lines
13 KiB
Go
// Package cmd is an interface for parsing the command line
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package cmd
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import (
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"fmt"
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"io"
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"math/rand"
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"os"
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"strings"
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"time"
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"github.com/micro/cli"
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"github.com/micro/go-micro/client"
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cgrpc "github.com/micro/go-micro/client/grpc"
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cmucp "github.com/micro/go-micro/client/mucp"
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"github.com/micro/go-micro/server"
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sgrpc "github.com/micro/go-micro/server/grpc"
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smucp "github.com/micro/go-micro/server/mucp"
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"github.com/micro/go-micro/util/log"
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// brokers
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"github.com/micro/go-micro/broker"
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"github.com/micro/go-micro/broker/http"
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"github.com/micro/go-micro/broker/memory"
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"github.com/micro/go-micro/broker/nats"
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// registries
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"github.com/micro/go-micro/registry"
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"github.com/micro/go-micro/registry/consul"
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"github.com/micro/go-micro/registry/gossip"
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"github.com/micro/go-micro/registry/mdns"
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rmem "github.com/micro/go-micro/registry/memory"
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// selectors
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"github.com/micro/go-micro/selector"
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"github.com/micro/go-micro/selector/dns"
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"github.com/micro/go-micro/selector/static"
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// transports
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"github.com/micro/go-micro/transport"
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tgrpc "github.com/micro/go-micro/transport/grpc"
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thttp "github.com/micro/go-micro/transport/http"
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tmem "github.com/micro/go-micro/transport/memory"
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)
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type Cmd interface {
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// The cli app within this cmd
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App() *cli.App
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// Adds options, parses flags and initialise
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// exits on error
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Init(opts ...Option) error
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// Options set within this command
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Options() Options
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}
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type cmd struct {
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opts Options
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app *cli.App
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}
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type Option func(o *Options)
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var (
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DefaultCmd = newCmd()
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DefaultFlags = []cli.Flag{
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cli.StringFlag{
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Name: "client",
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EnvVar: "MICRO_CLIENT",
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Usage: "Client for go-micro; rpc",
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},
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cli.StringFlag{
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Name: "client_request_timeout",
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EnvVar: "MICRO_CLIENT_REQUEST_TIMEOUT",
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Usage: "Sets the client request timeout. e.g 500ms, 5s, 1m. Default: 5s",
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},
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cli.IntFlag{
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Name: "client_retries",
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EnvVar: "MICRO_CLIENT_RETRIES",
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Value: client.DefaultRetries,
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Usage: "Sets the client retries. Default: 1",
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},
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cli.IntFlag{
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Name: "client_pool_size",
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EnvVar: "MICRO_CLIENT_POOL_SIZE",
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Usage: "Sets the client connection pool size. Default: 1",
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},
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cli.StringFlag{
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Name: "client_pool_ttl",
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EnvVar: "MICRO_CLIENT_POOL_TTL",
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Usage: "Sets the client connection pool ttl. e.g 500ms, 5s, 1m. Default: 1m",
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},
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cli.IntFlag{
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Name: "register_ttl",
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EnvVar: "MICRO_REGISTER_TTL",
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Usage: "Register TTL in seconds",
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},
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cli.IntFlag{
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Name: "register_interval",
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EnvVar: "MICRO_REGISTER_INTERVAL",
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Usage: "Register interval in seconds",
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},
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cli.StringFlag{
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Name: "server",
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EnvVar: "MICRO_SERVER",
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Usage: "Server for go-micro; rpc",
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},
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cli.StringFlag{
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Name: "server_name",
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EnvVar: "MICRO_SERVER_NAME",
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Usage: "Name of the server. go.micro.srv.example",
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},
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cli.StringFlag{
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Name: "server_version",
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EnvVar: "MICRO_SERVER_VERSION",
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Usage: "Version of the server. 1.1.0",
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},
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cli.StringFlag{
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Name: "server_id",
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EnvVar: "MICRO_SERVER_ID",
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Usage: "Id of the server. Auto-generated if not specified",
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},
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cli.StringFlag{
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Name: "server_address",
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EnvVar: "MICRO_SERVER_ADDRESS",
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Usage: "Bind address for the server. 127.0.0.1:8080",
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},
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cli.StringFlag{
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Name: "server_advertise",
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EnvVar: "MICRO_SERVER_ADVERTISE",
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Usage: "Used instead of the server_address when registering with discovery. 127.0.0.1:8080",
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},
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cli.StringSliceFlag{
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Name: "server_metadata",
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EnvVar: "MICRO_SERVER_METADATA",
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Value: &cli.StringSlice{},
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Usage: "A list of key-value pairs defining metadata. version=1.0.0",
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},
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cli.StringFlag{
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Name: "broker",
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EnvVar: "MICRO_BROKER",
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Usage: "Broker for pub/sub. http, nats, rabbitmq",
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},
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cli.StringFlag{
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Name: "broker_address",
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EnvVar: "MICRO_BROKER_ADDRESS",
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Usage: "Comma-separated list of broker addresses",
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},
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cli.StringFlag{
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Name: "registry",
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EnvVar: "MICRO_REGISTRY",
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Usage: "Registry for discovery. consul, mdns",
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},
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cli.StringFlag{
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Name: "registry_address",
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EnvVar: "MICRO_REGISTRY_ADDRESS",
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Usage: "Comma-separated list of registry addresses",
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},
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cli.StringFlag{
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Name: "selector",
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EnvVar: "MICRO_SELECTOR",
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Usage: "Selector used to pick nodes for querying",
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},
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cli.StringFlag{
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Name: "transport",
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EnvVar: "MICRO_TRANSPORT",
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Usage: "Transport mechanism used; http",
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},
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cli.StringFlag{
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Name: "transport_address",
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EnvVar: "MICRO_TRANSPORT_ADDRESS",
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Usage: "Comma-separated list of transport addresses",
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},
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}
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DefaultBrokers = map[string]func(...broker.Option) broker.Broker{
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"http": http.NewBroker,
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"memory": memory.NewBroker,
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"nats": nats.NewBroker,
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}
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DefaultClients = map[string]func(...client.Option) client.Client{
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"rpc": client.NewClient,
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"mucp": cmucp.NewClient,
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"grpc": cgrpc.NewClient,
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}
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DefaultRegistries = map[string]func(...registry.Option) registry.Registry{
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"consul": consul.NewRegistry,
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"gossip": gossip.NewRegistry,
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"mdns": mdns.NewRegistry,
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"memory": rmem.NewRegistry,
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}
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DefaultSelectors = map[string]func(...selector.Option) selector.Selector{
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"default": selector.NewSelector,
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"dns": dns.NewSelector,
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"cache": selector.NewSelector,
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"static": static.NewSelector,
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}
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DefaultServers = map[string]func(...server.Option) server.Server{
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"rpc": server.NewServer,
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"mucp": smucp.NewServer,
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"grpc": sgrpc.NewServer,
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}
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DefaultTransports = map[string]func(...transport.Option) transport.Transport{
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"memory": tmem.NewTransport,
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"http": thttp.NewTransport,
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"grpc": tgrpc.NewTransport,
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}
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// used for default selection as the fall back
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defaultClient = "rpc"
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defaultServer = "rpc"
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defaultBroker = "http"
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defaultRegistry = "mdns"
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defaultSelector = "registry"
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defaultTransport = "http"
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)
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func init() {
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rand.Seed(time.Now().Unix())
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help := cli.HelpPrinter
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cli.HelpPrinter = func(writer io.Writer, templ string, data interface{}) {
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help(writer, templ, data)
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os.Exit(0)
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}
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}
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func newCmd(opts ...Option) Cmd {
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options := Options{
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Broker: &broker.DefaultBroker,
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Client: &client.DefaultClient,
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Registry: ®istry.DefaultRegistry,
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Server: &server.DefaultServer,
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Selector: &selector.DefaultSelector,
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Transport: &transport.DefaultTransport,
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Brokers: DefaultBrokers,
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Clients: DefaultClients,
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Registries: DefaultRegistries,
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Selectors: DefaultSelectors,
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Servers: DefaultServers,
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Transports: DefaultTransports,
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}
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for _, o := range opts {
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o(&options)
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}
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if len(options.Description) == 0 {
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options.Description = "a go-micro service"
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}
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cmd := new(cmd)
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cmd.opts = options
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cmd.app = cli.NewApp()
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cmd.app.Name = cmd.opts.Name
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cmd.app.Version = cmd.opts.Version
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cmd.app.Usage = cmd.opts.Description
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cmd.app.Before = cmd.Before
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cmd.app.Flags = DefaultFlags
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cmd.app.Action = func(c *cli.Context) {}
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if len(options.Version) == 0 {
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cmd.app.HideVersion = true
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}
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return cmd
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}
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func (c *cmd) App() *cli.App {
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return c.app
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}
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func (c *cmd) Options() Options {
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return c.opts
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}
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func (c *cmd) Before(ctx *cli.Context) error {
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// If flags are set then use them otherwise do nothing
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var serverOpts []server.Option
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var clientOpts []client.Option
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// Set the client
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if name := ctx.String("client"); len(name) > 0 {
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// only change if we have the client and type differs
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if cl, ok := c.opts.Clients[name]; ok && (*c.opts.Client).String() != name {
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*c.opts.Client = cl()
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}
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}
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// Set the server
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if name := ctx.String("server"); len(name) > 0 {
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// only change if we have the server and type differs
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if s, ok := c.opts.Servers[name]; ok && (*c.opts.Server).String() != name {
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*c.opts.Server = s()
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}
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}
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// Set the broker
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if name := ctx.String("broker"); len(name) > 0 && (*c.opts.Broker).String() != name {
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b, ok := c.opts.Brokers[name]
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if !ok {
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return fmt.Errorf("Broker %s not found", name)
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}
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*c.opts.Broker = b()
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serverOpts = append(serverOpts, server.Broker(*c.opts.Broker))
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clientOpts = append(clientOpts, client.Broker(*c.opts.Broker))
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}
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// Set the registry
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if name := ctx.String("registry"); len(name) > 0 && (*c.opts.Registry).String() != name {
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r, ok := c.opts.Registries[name]
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if !ok {
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return fmt.Errorf("Registry %s not found", name)
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}
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*c.opts.Registry = r()
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serverOpts = append(serverOpts, server.Registry(*c.opts.Registry))
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clientOpts = append(clientOpts, client.Registry(*c.opts.Registry))
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if err := (*c.opts.Selector).Init(selector.Registry(*c.opts.Registry)); err != nil {
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log.Fatalf("Error configuring registry: %v", err)
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}
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clientOpts = append(clientOpts, client.Selector(*c.opts.Selector))
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if err := (*c.opts.Broker).Init(broker.Registry(*c.opts.Registry)); err != nil {
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log.Fatalf("Error configuring broker: %v", err)
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}
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}
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// Set the selector
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if name := ctx.String("selector"); len(name) > 0 && (*c.opts.Selector).String() != name {
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s, ok := c.opts.Selectors[name]
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if !ok {
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return fmt.Errorf("Selector %s not found", name)
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}
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*c.opts.Selector = s(selector.Registry(*c.opts.Registry))
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// No server option here. Should there be?
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clientOpts = append(clientOpts, client.Selector(*c.opts.Selector))
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}
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// Set the transport
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if name := ctx.String("transport"); len(name) > 0 && (*c.opts.Transport).String() != name {
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t, ok := c.opts.Transports[name]
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if !ok {
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return fmt.Errorf("Transport %s not found", name)
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}
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*c.opts.Transport = t()
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serverOpts = append(serverOpts, server.Transport(*c.opts.Transport))
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clientOpts = append(clientOpts, client.Transport(*c.opts.Transport))
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}
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// Parse the server options
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metadata := make(map[string]string)
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for _, d := range ctx.StringSlice("server_metadata") {
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var key, val string
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parts := strings.Split(d, "=")
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key = parts[0]
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if len(parts) > 1 {
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val = strings.Join(parts[1:], "=")
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}
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metadata[key] = val
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}
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if len(metadata) > 0 {
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serverOpts = append(serverOpts, server.Metadata(metadata))
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}
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if len(ctx.String("broker_address")) > 0 {
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if err := (*c.opts.Broker).Init(broker.Addrs(strings.Split(ctx.String("broker_address"), ",")...)); err != nil {
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log.Fatalf("Error configuring broker: %v", err)
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}
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}
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if len(ctx.String("registry_address")) > 0 {
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if err := (*c.opts.Registry).Init(registry.Addrs(strings.Split(ctx.String("registry_address"), ",")...)); err != nil {
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log.Fatalf("Error configuring registry: %v", err)
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}
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}
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if len(ctx.String("transport_address")) > 0 {
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if err := (*c.opts.Transport).Init(transport.Addrs(strings.Split(ctx.String("transport_address"), ",")...)); err != nil {
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log.Fatalf("Error configuring transport: %v", err)
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}
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}
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if len(ctx.String("server_name")) > 0 {
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serverOpts = append(serverOpts, server.Name(ctx.String("server_name")))
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}
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if len(ctx.String("server_version")) > 0 {
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serverOpts = append(serverOpts, server.Version(ctx.String("server_version")))
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}
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if len(ctx.String("server_id")) > 0 {
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serverOpts = append(serverOpts, server.Id(ctx.String("server_id")))
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}
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if len(ctx.String("server_address")) > 0 {
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serverOpts = append(serverOpts, server.Address(ctx.String("server_address")))
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}
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if len(ctx.String("server_advertise")) > 0 {
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serverOpts = append(serverOpts, server.Advertise(ctx.String("server_advertise")))
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}
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if ttl := time.Duration(ctx.GlobalInt("register_ttl")); ttl > 0 {
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serverOpts = append(serverOpts, server.RegisterTTL(ttl*time.Second))
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}
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if val := time.Duration(ctx.GlobalInt("register_interval")); val > 0 {
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serverOpts = append(serverOpts, server.RegisterInterval(val*time.Second))
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}
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// client opts
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if r := ctx.Int("client_retries"); r >= 0 {
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clientOpts = append(clientOpts, client.Retries(r))
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}
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if t := ctx.String("client_request_timeout"); len(t) > 0 {
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d, err := time.ParseDuration(t)
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if err != nil {
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return fmt.Errorf("failed to parse client_request_timeout: %v", t)
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}
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clientOpts = append(clientOpts, client.RequestTimeout(d))
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}
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if r := ctx.Int("client_pool_size"); r > 0 {
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clientOpts = append(clientOpts, client.PoolSize(r))
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}
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if t := ctx.String("client_pool_ttl"); len(t) > 0 {
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d, err := time.ParseDuration(t)
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if err != nil {
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return fmt.Errorf("failed to parse client_pool_ttl: %v", t)
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}
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clientOpts = append(clientOpts, client.PoolTTL(d))
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}
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// We have some command line opts for the server.
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// Lets set it up
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if len(serverOpts) > 0 {
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if err := (*c.opts.Server).Init(serverOpts...); err != nil {
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log.Fatalf("Error configuring server: %v", err)
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}
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}
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// Use an init option?
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if len(clientOpts) > 0 {
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if err := (*c.opts.Client).Init(clientOpts...); err != nil {
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log.Fatalf("Error configuring client: %v", err)
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}
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}
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return nil
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}
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func (c *cmd) Init(opts ...Option) error {
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for _, o := range opts {
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o(&c.opts)
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}
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c.app.Name = c.opts.Name
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c.app.Version = c.opts.Version
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c.app.HideVersion = len(c.opts.Version) == 0
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c.app.Usage = c.opts.Description
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c.app.RunAndExitOnError()
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return nil
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}
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func DefaultOptions() Options {
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return DefaultCmd.Options()
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}
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func App() *cli.App {
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return DefaultCmd.App()
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}
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func Init(opts ...Option) error {
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return DefaultCmd.Init(opts...)
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}
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func NewCmd(opts ...Option) Cmd {
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return newCmd(opts...)
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}
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