Provide a way for libnetwork users to make use of Agent mode functionalities

agent.go

@@ -62,7 +62,7 @@ func resolveAddr(addrOrInterface string) (string, error) {
 }
 
 func (c *controller) agentInit(bindAddrOrInterface string) error {
-	if !c.cfg.Daemon.IsAgent {
+	if !c.isAgent() {
 		return nil
 	}
 
@@ -94,12 +94,12 @@ func (c *controller) agentInit(bindAddrOrInterface string) error {
 	return nil
 }
 
-func (c *controller) agentJoin(remotes []string) error {
+func (c *controller) agentJoin(remote string) error {
 	if c.agent == nil {
 		return nil
 	}
 
-	return c.agent.networkDB.Join(remotes)
+	return c.agent.networkDB.Join([]string{remote})
 }
 
 func (c *controller) agentDriverNotify(d driverapi.Driver) {
@@ -126,6 +126,7 @@ func (c *controller) agentClose() {
 	c.agent.epTblCancel()
 
 	c.agent.networkDB.Close()
+	c.agent = nil
 }
 
 func (n *network) isClusterEligible() bool {

cluster/provider.go

@@ -0,0 +1,10 @@
+package cluster
+
+// Provider provides clustering config details
+type Provider interface {
+	IsManager() bool
+	IsAgent() bool
+	GetListenAddress() string
+	GetRemoteAddress() string
+	ListenClusterEvents() <-chan struct{}
+}

cmd/dnet/dnet.go

@@ -16,6 +16,7 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/BurntSushi/toml"
 	"github.com/codegangsta/cli"
 	"github.com/docker/docker/opts"
 	"github.com/docker/docker/pkg/discovery"
@@ -64,13 +65,31 @@ func main() {
 	}
 }
 
-func parseConfig(cfgFile string) (*config.Config, error) {
+// ParseConfig parses the libnetwork configuration file
+func (d *dnetConnection) parseOrchestrationConfig(tomlCfgFile string) error {
+	dummy := &dnetConnection{}
+
+	if _, err := toml.DecodeFile(tomlCfgFile, dummy); err != nil {
+		return err
+	}
+
+	if dummy.Orchestration != nil {
+		d.Orchestration = dummy.Orchestration
+	}
+	return nil
+}
+
+func (d *dnetConnection) parseConfig(cfgFile string) (*config.Config, error) {
 	if strings.Trim(cfgFile, " ") == "" {
 		cfgFile = os.Getenv(cfgFileEnv)
 		if strings.Trim(cfgFile, " ") == "" {
 			cfgFile = defaultCfgFile
 		}
 	}
+
+	if err := d.parseOrchestrationConfig(cfgFile); err != nil {
+		return nil, err
+	}
 	return config.ParseConfig(cfgFile)
 }
 
@@ -91,15 +110,6 @@ func processConfig(cfg *config.Config) []config.Option {
 		dd = cfg.Daemon.DefaultDriver
 	}
 	options = append(options, config.OptionDefaultDriver(dd))
-	if cfg.Daemon.IsAgent {
-		options = append(options, config.OptionAgent())
-	}
-
-	if cfg.Daemon.Bind != "" {
-		options = append(options, config.OptionBind(cfg.Daemon.Bind))
-	}
-
-	options = append(options, config.OptionNeighbors(cfg.Daemon.Neighbors))
 
 	if cfg.Daemon.Labels != nil {
 		options = append(options, config.OptionLabels(cfg.Daemon.Labels))
@@ -220,18 +230,30 @@ type dnetConnection struct {
 	// proto holds the client protocol i.e. unix.
 	proto string
 	// addr holds the client address.
-	addr string
+	addr          string
+	Orchestration *NetworkOrchestration
+	configEvent   chan struct{}
+}
+
+// NetworkOrchestration exported
+type NetworkOrchestration struct {
+	Agent   bool
+	Manager bool
+	Bind    string
+	Peer    string
 }
 
 func (d *dnetConnection) dnetDaemon(cfgFile string) error {
 	if err := startTestDriver(); err != nil {
 		return fmt.Errorf("failed to start test driver: %v\n", err)
 	}
 
-	cfg, err := parseConfig(cfgFile)
+	cfg, err := d.parseConfig(cfgFile)
 	var cOptions []config.Option
 	if err == nil {
 		cOptions = processConfig(cfg)
+	} else {
+		logrus.Errorf("Error parsing config %v", err)
 	}
 
 	bridgeConfig := options.Generic{
@@ -248,6 +270,11 @@ func (d *dnetConnection) dnetDaemon(cfgFile string) error {
 		fmt.Println("Error starting dnetDaemon :", err)
 		return err
 	}
+	controller.SetClusterProvider(d)
+
+	if d.Orchestration.Agent || d.Orchestration.Manager {
+		d.configEvent <- struct{}{}
+	}
 
 	createDefaultNetwork(controller)
 	httpHandler := api.NewHTTPHandler(controller)
@@ -271,6 +298,26 @@ func (d *dnetConnection) dnetDaemon(cfgFile string) error {
 	return http.ListenAndServe(d.addr, r)
 }
 
+func (d *dnetConnection) IsManager() bool {
+	return d.Orchestration.Manager
+}
+
+func (d *dnetConnection) IsAgent() bool {
+	return d.Orchestration.Agent
+}
+
+func (d *dnetConnection) GetListenAddress() string {
+	return d.Orchestration.Bind
+}
+
+func (d *dnetConnection) GetRemoteAddress() string {
+	return d.Orchestration.Peer
+}
+
+func (d *dnetConnection) ListenClusterEvents() <-chan struct{} {
+	return d.configEvent
+}
+
 func handleSignals(controller libnetwork.NetworkController) {
 	c := make(chan os.Signal, 1)
 	signals := []os.Signal{os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT}
@@ -354,7 +401,7 @@ func newDnetConnection(val string) (*dnetConnection, error) {
 		return nil, fmt.Errorf("dnet currently only supports tcp transport")
 	}
 
-	return &dnetConnection{protoAddrParts[0], protoAddrParts[1]}, nil
+	return &dnetConnection{protoAddrParts[0], protoAddrParts[1], &NetworkOrchestration{}, make(chan struct{}, 10)}, nil
 }
 
 func (d *dnetConnection) httpCall(method, path string, data interface{}, headers map[string][]string) (io.ReadCloser, http.Header, int, error) {

cmd/dnet/libnetwork.toml

@@ -11,3 +11,6 @@ title = "LibNetwork Configuration file"
 [datastore.client]
   provider = "consul"
   Address = "localhost:8500"
+[orchestration]
+  agent = true
+  peer="2.2.2.2"

config/config.go

@@ -8,6 +8,7 @@ import (
 	"github.com/docker/docker/pkg/discovery"
 	"github.com/docker/docker/pkg/tlsconfig"
 	"github.com/docker/libkv/store"
+	"github.com/docker/libnetwork/cluster"
 	"github.com/docker/libnetwork/datastore"
 	"github.com/docker/libnetwork/netlabel"
 )
@@ -21,15 +22,13 @@ type Config struct {
 
 // DaemonCfg represents libnetwork core configuration
 type DaemonCfg struct {
-	Debug          bool
-	IsAgent        bool
-	DataDir        string
-	DefaultNetwork string
-	DefaultDriver  string
-	Bind           string
-	Neighbors      []string
-	Labels         []string
-	DriverCfg      map[string]interface{}
+	Debug           bool
+	DataDir         string
+	DefaultNetwork  string
+	DefaultDriver   string
+	Labels          []string
+	DriverCfg       map[string]interface{}
+	ClusterProvider cluster.Provider
 }
 
 // ClusterCfg represents cluster configuration
@@ -84,27 +83,6 @@ func ParseConfigOptions(cfgOptions ...Option) *Config {
 // to the controller
 type Option func(c *Config)
 
-// OptionBind function returns an option setter for setting a bind interface or address
-func OptionBind(bind string) Option {
-	return func(c *Config) {
-		c.Daemon.Bind = bind
-	}
-}
-
-// OptionAgent function returns an option setter for setting agent mode
-func OptionAgent() Option {
-	return func(c *Config) {
-		c.Daemon.IsAgent = true
-	}
-}
-
-// OptionNeighbors function returns an option setter for setting a list of neighbors to join.
-func OptionNeighbors(neighbors []string) Option {
-	return func(c *Config) {
-		c.Daemon.Neighbors = neighbors
-	}
-}
-
 // OptionDefaultNetwork function returns an option setter for a default network
 func OptionDefaultNetwork(dn string) Option {
 	return func(c *Config) {