Now pulling VM data from named VMs

- Next is to get the list and setting the information using go routines for each VM

lib/guest/domains.go

@@ -3,6 +3,7 @@ package guest
 
 import (
 	"errors"
+	"log"
 	"time"
 
 	"libvirt.org/go/libvirt"
@@ -104,14 +105,12 @@ func GetGuest(name string, conn *libvirt.Connect) (*VM, error) {
 
 	// If the domain can't be found by name, exit early with an error
 	if g.dom, err = conn.LookupDomainByName(name); err != nil {
-		return g, ErrVMNotFound
+		return g, err
 	}
 	if g.ID, err = g.dom.GetID(); err != nil {
 		return g, err
 	}
-	if g.BackupXML, err = g.dom.BackupGetXMLDesc(0); err != nil {
-		return g, err
-	}
+
 	if g.Autostart, err = g.dom.GetAutostart(); err != nil {
 		return g, err
 	}
@@ -197,6 +196,11 @@ func GetGuest(name string, conn *libvirt.Connect) (*VM, error) {
 		}
 	}
 
+	// Not errors, but still log the warnings when this happens
+	if g.BackupXML, err = g.dom.BackupGetXMLDesc(0); err != nil {
+		log.Printf("WARNING: While loading backup information: %s", err)
+	}
+
 	go func() {
 		defer close(g.closeErr)
 		<-g.close
@@ -216,6 +220,7 @@ func setNotSet(v string, s bool) string {
 
 // Close closes an open connection
 func (g *VM) Close() error {
+	log.Println("Closing VM", g.Name)
 	close(g.close)
 	return <-g.closeErr
 }

lib/host/host.go

@@ -2,6 +2,7 @@ package host
 
 import (
 	"fmt"
+	"log"
 
 	"git.staur.ca/stobbsm/clustvirt/lib/guest"
 	"libvirt.org/go/libvirt"
@@ -61,11 +62,11 @@ func (h *Host) GetGuestByName(name string) (*guest.VM, error) {
 		return guest.GetGuest(name, h.conn)
 	}
 	return nil, err
-	
 }
 
 // Close triggers closing the host connection
 func (h *Host) Close() error {
+	log.Println("Closing Host", h.HostName)
 	close(h.close)
 	return <-h.closeErr
 }

main.go

@@ -2,21 +2,22 @@ package main
 
 import (
 	"log"
+
+	"git.staur.ca/stobbsm/clustvirt/lib/host"
 )
 
 func main() {
 	log.Println("Starting clustvirt, the libvirt cluster manager")
 
-	// Try connecting to libvirt
-	doms, err := GetDomsInCluster("earth.staur.ca", "mars.staur.ca", "venus.staur.ca")
+	venus, err := host.ConnectHost("venus.staur.ca")
 	if err != nil {
 		log.Fatal(err)
 	}
-	log.Printf("Domains in cluster: %d", len(doms))
-	// Example of xmlns uri found in libvirt xml definition:
-	// xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0"
-	for _, d := range doms {
-		log.Println(d.GetMetadata(0, "", 0))
-		d.Free()
+	defer venus.Close()
+	lm, err := venus.GetGuestByName("logan-minecraft")
+	if err != nil {
+		log.Fatal(err)
 	}
+	defer lm.Close()
+	log.Println(lm)
 }

util/cleanup/cleanup.go

@@ -0,0 +1,55 @@
+// Package cleanup collects functions that should be run at the end of program operation
+// to clean things up and shut things down properly.
+// The default CleanItUp instance is initialized with a size 3 stack, just so it's initialized.
+package cleanup
+
+// CleanItUp holds a stack of functions that take no arguments and return no
+// values, in order to run the stack at a given point.
+// Technically doesn't need to be used for cleanup, but that is it's purpose.
+type CleanItUp struct {
+	stack []EmptyFunc
+}
+
+// EmptyFunc is just what you think it is, a function with no arguments and no returns
+type EmptyFunc func()
+
+var cleaner *CleanItUp
+
+func init() {
+	cleaner = &CleanItUp{
+		stack: make([]EmptyFunc, 3),
+	}
+}
+
+// Push onto the default (global) CleanItUp instance
+func Push(f EmptyFunc) {
+	cleaner.Push(f)
+}
+
+// Push adds a function to the end of the function stack
+func (c *CleanItUp) Push(f EmptyFunc) {
+	c.stack = append(c.stack, f)
+}
+
+// Stack onto the default (global) CleanItUp instance
+func Stack(f EmptyFunc) {
+	cleaner.Stack(f)
+}
+
+// Stack adds a function to the start of the function stack
+// not very efficient, doesn't really need to be.
+func (c *CleanItUp) Stack(f EmptyFunc) {
+	c.stack = append([]EmptyFunc{f}, c.stack...)
+}
+
+// Clean using the default (global) CleanItUp instance
+func Clean() {
+	cleaner.Clean()
+}
+
+// Clean runs the stack in reverse order, using the defer keyword to make sure they all run
+func (c *CleanItUp) Clean() {
+	for i := len(c.stack) - 1; i >= 0; i-- {
+		defer c.stack[i]()
+	}
+}