Golang Context.Put方法代码示例

// ParallelBuild runs multiple docker builds at the same time.
//
// Params:
//	-images ([]BuildImg): Images to build
// 	-alwaysFetch (bool): Default false. If set to true, this will always fetch
// 		the Docker image even if it already exists in the registry.
//
// Returns:
//
// 	- Waiter: A *sync.WaitGroup that is waiting for the docker downloads to finish.
//
// Context:
//
// This puts 'ParallelBuild.failN" (int) into the context to indicate how many failures
// occurred during fetches.
func ParallelBuild(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	images := p.Get("images", []BuildImg{}).([]BuildImg)

	var wg sync.WaitGroup
	var m sync.Mutex
	var fails int

	for _, img := range images {
		img := img
		wg.Add(1)
		safely.GoDo(c, func() {
			log.Infof(c, "Starting build for %s (tag: %s)", img.Path, img.Tag)
			if _, err := buildImg(c, img.Path, img.Tag); err != nil {
				log.Errf(c, "Failed to build docker image: %s", err)
				m.Lock()
				fails++
				m.Unlock()
			}
			wg.Done()
		})

	}

	// Number of failures.
	c.Put("ParallelBuild.failN", fails)

	return &wg, nil
}

// ParallelBuild runs multiple docker builds at the same time.
//
// Params:
//	-images ([]BuildImg): Images to build
// 	-alwaysFetch (bool): Default false. If set to true, this will always fetch
// 		the Docker image even if it already exists in the registry.
//
// Returns:
//
// 	- Waiter: A *sync.WaitGroup that is waiting for the docker downloads to finish.
//
// Context:
//
// This puts 'ParallelBuild.failN" (int) into the context to indicate how many failures
// occurred during fetches.
func ParallelBuild(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	images := p.Get("images", []BuildImg{}).([]BuildImg)

	var wg sync.WaitGroup
	var m sync.Mutex
	var fails int

	for _, img := range images {
		img := img

		// HACK: ensure "docker build" is serialized by allowing only one entry in
		// the WaitGroup. This works around the "simultaneous docker pull" bug.
		wg.Wait()
		wg.Add(1)
		safely.GoDo(c, func() {
			log.Infof(c, "Starting build for %s (tag: %s)", img.Path, img.Tag)
			if _, err := buildImg(c, img.Path, img.Tag); err != nil {
				log.Errf(c, "Failed to build docker image: %s", err)
				m.Lock()
				fails++
				m.Unlock()
			}
			wg.Done()
		})

	}

	// Number of failures.
	c.Put("ParallelBuild.failN", fails)

	return &wg, nil
}

// Serve starts a native SSH server.
//
// The general design of the server is that it acts as a main server for
// a Cookoo app. It assumes that certain things have been configured for it,
// like an ssh.ServerConfig. Once it runs, it will block until the main
// process terminates. If you want to stop it prior to that, you can grab
// the closer ("sshd.Closer") out of the context and send it a signal.
//
// Currently, the service is not generic. It only runs git hooks.
//
// This expects the following Context variables.
// 	- ssh.Hostkeys ([]ssh.Signer): Host key, as an unparsed byte slice.
// 	- ssh.Address (string): Address/port
// 	- ssh.ServerConfig (*ssh.ServerConfig): The server config to use.
//
// This puts the following variables into the context:
// 	- ssh.Closer (chan interface{}): Send a message to this to shutdown the server.
func Serve(reg *cookoo.Registry, router *cookoo.Router, c cookoo.Context) cookoo.Interrupt {
	hostkeys := c.Get(HostKeys, []ssh.Signer{}).([]ssh.Signer)
	addr := c.Get(Address, "0.0.0.0:2223").(string)
	cfg := c.Get(ServerConfig, &ssh.ServerConfig{}).(*ssh.ServerConfig)

	for _, hk := range hostkeys {
		cfg.AddHostKey(hk)
		log.Infof(c, "Added hostkey.")
	}

	listener, err := net.Listen("tcp", addr)
	if err != nil {
		return err
	}

	srv := &server{
		c:       c,
		gitHome: "/home/git",
	}

	closer := make(chan interface{}, 1)
	c.Put("sshd.Closer", closer)

	log.Infof(c, "Listening on %s", addr)
	srv.listen(listener, cfg, closer)

	return nil
}

// iam injects info into the environment about a host's self.
//
// Sets the following environment variables. (Values represent the data format.
// Instances will get its own values.)
//
//	MY_NODEIP=10.245.1.3
//	MY_SERVICE_IP=10.22.1.4
// 	MY_PORT_PEER=2380
// 	MY_PORT_CLIENT=2379
//	MY_NAMESPACE=default
//	MY_SELFLINK=/api/v1/namespaces/default/pods/deis-etcd-1-336jp
//	MY_UID=62a3b54a-6956-11e5-b8ab-0800279dd272
//	MY_APISERVER=https://10.247.0.1:443
//	MY_NAME=deis-etcd-1-336jp
//	MY_IP=10.246.44.7
//	MY_LABEL_NAME=deis-etcd-1   # One entry per label in the JSON
// 	MY_ANNOTATION_NAME=deis-etcd-1  # One entry per annitation in the JSON
//	MY_PORT_CLIENT=4100
//	MY_PORT_PEER=2380
func iam(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	me, err := aboutme.FromEnv()
	if err != nil {
		log.Errf(c, "Failed aboutme.FromEnv: %s", err)
	} else {

		if strings.TrimSpace(me.IP) == "" {
			log.Warn(c, "No IP found by API query.")
			ip, err := aboutme.MyIP()
			if err != nil || ip == "" {
				// Force pod death.
				log.Errf(c, "Failed to get an IP address: %s", err)
				os.Exit(5)
			}
		}

		me.ShuntEnv()
		os.Setenv("ETCD_NAME", me.Name)
		c.Put("ETCD_NAME", me.Name)
	}

	passEnv("MY_PORT_CLIENT", "$DEIS_ETCD_1_SERVICE_PORT_CLIENT")
	passEnv("MY_PORT_PEER", "$DEIS_ETCD_1_SERVICE_PORT_PEER")
	return nil, nil
}

// ParseYaml parses the glide.yaml format and returns a Configuration object.
//
// Params:
//	- filename (string): YAML filename as a string
//
// Context:
//	- yaml.File: This puts the parsed YAML file into the context.
//
// Returns:
//	- *Config: The configuration.
func ParseYaml(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	fname := p.Get("filename", "glide.yaml").(string)
	//conf := new(Config)
	f, err := yaml.ReadFile(fname)
	if err != nil {
		return nil, err
	}

	c.Put("yaml.File", f)
	return FromYaml(f.Root)
}

func setupHandler(c *cli.Context, route string, cxt cookoo.Context, router *cookoo.Router) {
	cxt.Put("q", c.GlobalBool("quiet"))
	cxt.Put("debug", c.GlobalBool("debug"))
	cxt.Put("no-color", c.GlobalBool("no-color"))
	cxt.Put("yaml", c.GlobalString("yaml"))
	cxt.Put("home", c.GlobalString("home"))
	cxt.Put("cliArgs", c.Args())
	if err := router.HandleRequest(route, cxt, false); err != nil {
		fmt.Printf("Oops! %s\n", err)
		os.Exit(1)
	}
}

// iam injects info into the environment about a host's self.
//
// Sets the following environment variables. (Values represent the data format.
// Instances will get its own values.)
//
//	MY_NODEIP=10.245.1.3
//	MY_SERVICE_IP=10.22.1.4
// 	MY_PORT_PEER=2380
// 	MY_PORT_CLIENT=2379
//	MY_NAMESPACE=default
//	MY_SELFLINK=/api/v1/namespaces/default/pods/deis-etcd-1-336jp
//	MY_UID=62a3b54a-6956-11e5-b8ab-0800279dd272
//	MY_APISERVER=https://10.247.0.1:443
//	MY_NAME=deis-etcd-1-336jp
//	MY_IP=10.246.44.7
//	MY_LABEL_NAME=deis-etcd-1   # One entry per label in the JSON
// 	MY_ANNOTATION_NAME=deis-etcd-1  # One entry per annitation in the JSON
//	MY_PORT_CLIENT=4100
//	MY_PORT_PEER=2380
func iam(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	me, err := aboutme.FromEnv()
	if err != nil {
		log.Errf(c, "Failed aboutme.FromEnv: %s", err)
	} else {
		me.ShuntEnv()
		os.Setenv("ETCD_NAME", me.Name)
		c.Put("ETCD_NAME", me.Name)
	}

	passEnv("MY_PORT_CLIENT", "$DEIS_ETCD_1_SERVICE_PORT_CLIENT")
	passEnv("MY_PORT_PEER", "$DEIS_ETCD_1_SERVICE_PORT_PEER")
	return nil, nil
}

// Get gets one or more environment variables and puts them into the context.
//
// Parameters passed in are of the form varname => defaultValue.
//
// 	r.Route("foo", "example").Does(envvar.Get).Using("HOME").WithDefault(".")
//
// As with all environment variables, the default value must be a string.
//
// WARNING: Since parameters are a map, order of processing is not
// guaranteed. If order is important, you'll need to call this command
// multiple times.
//
// For each parameter (`Using` clause), this command will look into the
// environment for a matching variable. If it finds one, it will add that
// variable to the context. If it does not find one, it will expand the
// default value (so you can set a default to something like "$HOST:$PORT")
// and also put the (unexpanded) default value back into the context in case
// any subsequent call to `os.Getenv` occurs.
func Get(c cookoo.Context, params *cookoo.Params) (interface{}, cookoo.Interrupt) {
	for name, def := range params.AsMap() {
		var val string
		if val = os.Getenv(name); len(val) == 0 {
			def := def.(string)
			val = os.ExpandEnv(def)
			// We want to make sure that any subsequent calls to Getenv
			// return the same default.
			os.Setenv(name, val)

		}
		c.Put(name, val)
		log.Debugf(c, "Name: %s, Val: %s", name, val)
	}
	return true, nil
}

// Configure creates a new SSH configuration object.
//
// Config sets a PublicKeyCallback handler that forwards public key auth
// requests to the route named "pubkeyAuth".
//
// This assumes certain details about our environment, like the location of the
// host keys. It also provides only key-based authentication.
// ConfigureServerSshConfig
//
// Returns:
//  An *ssh.ServerConfig
func Configure(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	router := c.Get("cookoo.Router", nil).(*cookoo.Router)

	cfg := &ssh.ServerConfig{
		PublicKeyCallback: func(m ssh.ConnMetadata, k ssh.PublicKey) (*ssh.Permissions, error) {
			c.Put("metadata", m)
			c.Put("key", k)

			pubkeyAuth := c.Get("route.sshd.pubkeyAuth", "pubkeyAuth").(string)
			err := router.HandleRequest(pubkeyAuth, c, true)
			return c.Get("pubkeyAuth", &ssh.Permissions{}).(*ssh.Permissions), err
		},
	}

	return cfg, nil
}

// Set takes the given names and values and puts them into both the context
// and the environment.
//
// Unlike Get, it does not try to retrieve the values from the environment
// first.
//
// Values are passed through os.ExpandEnv()
//
// There is no guarantee of insertion order. If multiple name/value pairs
// are given, they will be put into the context in whatever order they
// are retrieved from the underlying map.
//
// Params:
//   accessed as map[string]string
// Returns:
//   nothing, but inserts all name/value pairs into the context and the
//   environment.
func Set(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	for name, def := range p.AsMap() {
		// Assume Nil means unset the value.
		if def == nil {
			def = ""
		}

		val := fmt.Sprintf("%v", def)
		val = os.ExpandEnv(val)
		log.Debugf(c, "Name: %s, Val: %s", name, val)

		os.Setenv(name, val)
		c.Put(name, val)
	}
	return true, nil

}

func addFlagsToContext(flagset *flag.FlagSet, cxt cookoo.Context) {
	store := func(f *flag.Flag) {
		// fmt.Printf("Storing %s in context with value %s.\n", f.Name, f.Value.String())

		// Basically, we can tell the difference between booleans and strings, and that's it.
		// Other types are a loss.
		/*
			if f.IsBoolFlag != nil {
				cxt.Put(f.Name, f.Value.String() == "true")
			} else {
				cxt.Put(f.Name, f.Value.String())
			}
		*/
		cxt.Put(f.Name, f.Value.String())
	}

	flagset.VisitAll(store)
}

// AuthKey authenticates based on a public key.
//
// Params:
// 	- metadata (ssh.ConnMetadata)
// 	- key (ssh.PublicKey)
//
// Returns:
// 	*ssh.Permissions
//
func AuthKey(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	log.Debugf(c, "Starting ssh authentication")
	key := p.Get("key", nil).(ssh.PublicKey)
	userInfo, err := controller.UserInfoFromKey(key)
	if err != nil {
		return nil, err
	}

	userInfo.Key = string(ssh.MarshalAuthorizedKey(key))
	c.Put("userinfo", userInfo)

	log.Infof(c, "Key accepted for user %s.", userInfo.Username)
	perm := &ssh.Permissions{
		Extensions: map[string]string{
			"user": userInfo.Username,
		},
	}
	return perm, nil
}

// Shift the args N (default 1) times, returning the last shifted value.
//
// Params:
// 	- n: The number of times to shift. Only the last value is returned.
// 	- args: The name of the context slice/array to modify. This value will be retrieved
// 	 from the context. Default: "os.Args"
func ShiftArgs(c cookoo.Context, params *cookoo.Params) (interface{}, cookoo.Interrupt) {

	n := params.Get("n", 1).(int)
	argName := params.Get("args", "os.Args").(string)

	args, ok := c.Get(argName, nil).([]string)
	if !ok {
		return nil, &cookoo.FatalError{"Could not get arg out of context: No such arg name."}
	}

	if len(args) < n {
		c.Put(argName, make([]string, 0))
		//log.Printf("Not enough args in %s", argName)
		return nil, &cookoo.RecoverableError{"Not enough arguments."}
	}
	targetArg := n - 1
	shifted := args[targetArg]
	c.Put(argName, args[n:])

	return shifted, nil
}

// Get gets one or more environment variables and puts them into the context.
//
// Parameters passed in are of the form varname => defaultValue.
//
// 	r.Route("foo", "example").Does(envvar.Get).Using("HOME").WithDefault(".")
//
// As with all environment variables, the default value must be a string.
//
// WARNING: Since parameters are a map, order of processing is not
// guaranteed. If order is important, you'll need to call this command
// multiple times.
//
// For each parameter (`Using` clause), this command will look into the
// environment for a matching variable. If it finds one, it will add that
// variable to the context. If it does not find one, it will expand the
// default value (so you can set a default to something like "$HOST:$PORT")
// and also put the (unexpanded) default value back into the context in case
// any subsequent call to `os.Getenv` occurs.
func Get(c cookoo.Context, params *cookoo.Params) (interface{}, cookoo.Interrupt) {
	for name, def := range params.AsMap() {
		var val string
		if val = os.Getenv(name); len(val) == 0 {
			if def == nil {
				def = ""
			}
			def, ok := def.(string)
			if !ok {
				log.Warnf(c, "Could not convert %s. Type is %T", name, def)
			}
			val = os.ExpandEnv(def)
			// We want to make sure that any subsequent calls to Getenv
			// return the same default.
			os.Setenv(name, val)

		}
		c.Put(name, val)
		log.Debugf(c, "Name: %s, Val: %s", name, val)
	}
	return true, nil
}

// iam injects info into the environment about a host's self.
//
// Sets the following environment variables. (Values represent the data format.
// Instances will get its own values.)
//
//	MY_NODEIP=10.245.1.3
//	MY_SERVICE_IP=10.22.1.4
// 	MY_PORT_PEER=2380
// 	MY_PORT_CLIENT=2379
//	MY_NAMESPACE=default
//	MY_SELFLINK=/api/v1/namespaces/default/pods/deis-etcd-1-336jp
//	MY_UID=62a3b54a-6956-11e5-b8ab-0800279dd272
//	MY_APISERVER=https://10.247.0.1:443
//	MY_NAME=deis-etcd-1-336jp
//	MY_IP=10.246.44.7
//	MY_LABEL_NAME=deis-etcd-1   # One entry per label in the JSON
// 	MY_ANNOTATION_NAME=deis-etcd-1  # One entry per annitation in the JSON
//	MY_PORT_CLIENT=4100
//	MY_PORT_PEER=2380
func iam(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
	me, err := aboutme.FromEnv()
	if err != nil {
		log.Errf(c, "Failed aboutme.FromEnv: %s", err)
		log.Warn(c, "Attempting to recover.")
	}

	// This will try to recover whenever IP is not set. Only some fields
	// can be recovered. But all we really need is IP and Name.
	if strings.TrimSpace(me.IP) == "" {
		log.Warn(c, "No IP found by API query.")
		ip, err := aboutme.MyIP()
		if err != nil || ip == "" {
			// Force pod death.
			log.Errf(c, "Failed to get an IP address: %s", err)
			os.Exit(5)
		}
		me.IP = ip
	}
	if strings.TrimSpace(me.Name) == "" {
		// Try to set name from DAPI.
		me.Name = os.Getenv("POD_NAME")
		log.Warnf(c, "Setting name to %q", me.Name)
	}
	if strings.TrimSpace(me.Namespace) == "" {
		// Try to set namespace from DAPI.
		me.Namespace = os.Getenv("POD_NAMESPACE")
		log.Warnf(c, "Setting name to %q", me.Namespace)
	}

	me.ShuntEnv()
	os.Setenv("ETCD_NAME", me.Name)
	c.Put("ETCD_NAME", me.Name)

	passEnv("MY_PORT_CLIENT", "$DEIS_ETCD_1_SERVICE_PORT_CLIENT")
	passEnv("MY_PORT_PEER", "$DEIS_ETCD_1_SERVICE_PORT_PEER")
	return nil, nil
}