store libamchine hosts in a map (#3)

Loading a new one each time creates a new rpc server,
each time listening on a new port.

Makefile

@@ -1,4 +1,4 @@
-VERSION ?= v2.0.1
+VERSION ?= v2.0.2
 
 clean:
 	rm -rf build
@@ -11,7 +11,7 @@ build: clean
 		tar -cvzf build/releases/dockness-$$os-x64.tar.gz -C build/$$os dockness; \
 	done
 
-release:
+release: build
 	git tag $(VERSION)
 	git push origin $(VERSION)
 	github-release release --user bamarni --repo dockness --tag $(VERSION) --name "$(VERSION)"

dockness.go

@@ -4,6 +4,7 @@ import (
 	"flag"
 	"github.com/docker/machine/commands/mcndirs"
 	"github.com/docker/machine/libmachine"
+	mcnhost "github.com/docker/machine/libmachine/host"
 	mcnlog "github.com/docker/machine/libmachine/log"
 	"github.com/miekg/dns"
 	"log"
@@ -15,6 +16,7 @@ import (
 
 var api *libmachine.Client
 var ttl uint
+var machines = make(map[string]*mcnhost.Host)
 
 func lookup(w dns.ResponseWriter, r *dns.Msg) {
 	m := new(dns.Msg)
@@ -35,13 +37,16 @@ func lookup(w dns.ResponseWriter, r *dns.Msg) {
 		}
 		machineName := domLevels[len(domLevels)-3]
 
-		machine, err := api.Load(machineName)
-		if err != nil {
-			mcnlog.Debugf("Couldn't load machine '%s' : %s", machineName, err)
-			continue
+		if machines[machineName] == nil {
+			machine, err := api.Load(machineName)
+			if err != nil {
+				mcnlog.Debugf("Couldn't load machine '%s' : %s", machineName, err)
+				continue
+			}
+			machines[machineName] = machine
 		}
 
-		ip, err := machine.Driver.GetIP()
+		ip, err := machines[machineName].Driver.GetIP()
 		if err != nil {
 			mcnlog.Debugf("Couldn't find IP for machine '%s' : %s", machineName, err)
 			continue