cli, engine, etcd, lib: Move the hostname value to the API

Every world implementation needs a unique UUID, might as well move this
to the API.

cli/deploy.go

@@ -199,7 +199,6 @@ func (obj *DeployArgs) Run(ctx context.Context, data *cliUtil.Data) (bool, error
 
 	var world engine.World
 	world = &etcd.World{ // XXX: What should some of these fields be?
-		//Hostname:       hostname,
 		Client: etcdClient,
 		//MetadataPrefix: lib.MetadataPrefix,
 		//StoragePrefix:  lib.StoragePrefix,
@@ -210,7 +209,6 @@ func (obj *DeployArgs) Run(ctx context.Context, data *cliUtil.Data) (bool, error
 	if obj.SshUrl != "" { // alternate world implementation over SSH
 		world = &etcdSSH.World{
 			URL: obj.SshUrl,
-			//Hostname:       hostname,
 			//Client:         client,
 			NS: lib.NS,
 			//MetadataPrefix: lib.MetadataPrefix,
@@ -224,6 +222,7 @@ func (obj *DeployArgs) Run(ctx context.Context, data *cliUtil.Data) (bool, error
 		return false, fmt.Errorf("--ssh-url is not implemented yet")
 	}
 	worldInit := &engine.WorldInit{
+		Hostname: "", // XXX: Should we set this?
 		Debug:    data.Flags.Debug,
 		Logf: func(format string, v ...interface{}) {
 			Logf("world: etcd: "+format, v...)

engine/world.go

@@ -39,6 +39,9 @@ import (
 // WorldInit is some data passed in when starting the World interface.
 // TODO: This is a lousy struct name, feel free to change it.
 type WorldInit struct {
+	// Hostname is the UUID we use to represent ourselves to everyone else.
+	Hostname string
+
 	// Debug represents if we're running in debug mode or not.
 	Debug bool
 

etcd/ssh/ssh.go

@@ -81,7 +81,6 @@ type World struct {
 	// NS is the etcd namespace to use.
 	NS string
 
-	Hostname       string    // uuid for the consumer of these
 	MetadataPrefix string    // expected metadata prefix
 	StoragePrefix  string    // storage prefix for etcdfs storage
 	StandaloneFs   engine.Fs // store an fs here for local usage
@@ -305,7 +304,6 @@ func (obj *World) Init(init *engine.WorldInit) error {
 
 	obj.World = &etcd.World{
 		// TODO: Pass through more data if the struct for etcd changes.
-		Hostname:       obj.Hostname,
 		Client:         c,
 		MetadataPrefix: obj.MetadataPrefix,
 		StoragePrefix:  obj.StoragePrefix,

etcd/world.go

@@ -53,7 +53,6 @@ import (
 // World is an etcd backed implementation of the World interface.
 type World struct {
 	// NOTE: Update the etcd/ssh/ World struct if this one changes.
-	Hostname string // uuid for the consumer of these
 	// XXX: build your own etcd client...
 	Client         interfaces.Client
 	MetadataPrefix string    // expected metadata prefix
@@ -128,7 +127,7 @@ func (obj *World) ResWatch(ctx context.Context) (chan error, error) {
 // ResExport exports a list of resources under our hostname namespace.
 // Subsequent calls replace the previously set collection atomically.
 func (obj *World) ResExport(ctx context.Context, resourceList []engine.Res) error {
-	return resources.SetResources(ctx, obj.Client, obj.Hostname, resourceList)
+	return resources.SetResources(ctx, obj.Client, obj.init.Hostname, resourceList)
 }
 
 // ResCollect gets the collection of exported resources which match the filter.
@@ -226,12 +225,12 @@ func (obj *World) StrMapGet(ctx context.Context, namespace string) (map[string]s
 // StrMapSet sets the namespace value to a particular string under the identity
 // of its own hostname.
 func (obj *World) StrMapSet(ctx context.Context, namespace, value string) error {
-	return strmap.SetStrMap(ctx, obj.Client, obj.Hostname, namespace, &value)
+	return strmap.SetStrMap(ctx, obj.Client, obj.init.Hostname, namespace, &value)
 }
 
 // StrMapDel deletes the value in a particular namespace.
 func (obj *World) StrMapDel(ctx context.Context, namespace string) error {
-	return strmap.SetStrMap(ctx, obj.Client, obj.Hostname, namespace, nil)
+	return strmap.SetStrMap(ctx, obj.Client, obj.init.Hostname, namespace, nil)
 }
 
 // Scheduler returns a scheduling result of hosts in a particular namespace.
@@ -246,7 +245,7 @@ func (obj *World) Scheduler(namespace string, opts ...scheduler.Option) (*schedu
 	modifiedOpts = append(modifiedOpts, scheduler.Logf(obj.init.Logf))
 
 	path := fmt.Sprintf(schedulerPathFmt, namespace)
-	return scheduler.Schedule(obj.Client.GetClient(), path, obj.Hostname, modifiedOpts...)
+	return scheduler.Schedule(obj.Client.GetClient(), path, obj.init.Hostname, modifiedOpts...)
 }
 
 // URI returns the current FS URI.

lib/main.go

@@ -621,7 +621,6 @@ func (obj *Main) Run() error {
 	// an etcd component from the etcd package added in.
 	var world engine.World
 	world = &etcd.World{
-		Hostname: hostname,
 		Client: client,
 		//NS: NS,
 		MetadataPrefix: MetadataPrefix,
@@ -638,7 +637,6 @@ func (obj *Main) Run() error {
 		world = &etcdSSH.World{
 			URL:            obj.SshUrl,
 			Seeds:          obj.Seeds,
-			Hostname:       hostname,
 			NS:             NS,
 			MetadataPrefix: MetadataPrefix,
 			StoragePrefix:  StoragePrefix,
@@ -652,6 +650,7 @@ func (obj *Main) Run() error {
 		}
 	}
 	worldInit := &engine.WorldInit{
+		Hostname: hostname,
 		Debug:    obj.Debug,
 		Logf: func(format string, v ...interface{}) {
 			obj.Logf("world: etcd: "+format, v...)