sets unique spice port and saves config filesv0.2

Signed-off-by: Jeff Carr <[email protected]>

1 files changed, 106 insertions, 0 deletions

diff --git a/start.go b/start.go
new file mode 100644
index 0000000..556c2d0
--- /dev/null
+++ b/start.go
@@ -0,0 +1,106 @@
+package main
+
+// validates the droplet information
+// finds a hypervisor
+// attempts to start the virtual machine
+
+import (
+	"errors"
+	"fmt"
+	"math/rand"
+	"time"
+
+	"go.wit.com/lib/gui/shell"
+	pb "go.wit.com/lib/protobuf/virtbuf"
+)
+
+// for now, because sometimes this should write to stdout and
+// sometimes to http socket, it returns a string
+func Start(name string) (string, error) {
+	var result string
+
+	// lookup the droplet by name
+	d := findDroplet(name)
+	if d == nil {
+		result = "can't start unknown droplet: " + name
+		return result, errors.New(result)
+	}
+
+	// validate the droplet
+	if err := ValidateDroplet(d); err != nil {
+		result = "ValidateDroplet() failed droplet " + d.Hostname
+		return result, err
+	}
+
+	// is the droplet already on?
+	if d.CurrentState == pb.DropletState_ON {
+		result = "EVENT start droplet " + d.Hostname + " is already ON"
+		return result, errors.New(result)
+	}
+
+	// how long has the cluster been stable?
+	// wait until it is stable. use this to throttle droplet starts
+	dur := time.Since(me.unstable)
+	result = fmt.Sprintln("should start droplet", name, "here. grid stable for:", shell.FormatDuration(dur))
+	if dur < me.unstableTimeout {
+		tmp := shell.FormatDuration(me.unstableTimeout)
+		result += "grid is still too unstable (unstable timeout = " + tmp + ")"
+		return result, errors.New("grid is still unstable")
+	}
+
+	// make the list of hypervisors that are active and can start new droplets
+	var pool []*HyperT
+	for _, h := range me.hypers {
+		// this droplet is set to use this and only this hypervisor
+		if d.ForceHypervisor == h.pb.Hostname {
+			ok, b := h.start(d)
+			if ok {
+				return result + b, nil
+			}
+			return result + b, errors.New("start " + name + " on hypervisor " + h.pb.Hostname)
+		}
+
+		// skip hypervisors marked inactive
+		if h.pb.Active != true {
+			result += fmt.Sprintln("hypervisor is inactive:", name, "for", h.pb.Hostname, h.pb.Active)
+			continue
+		}
+
+		// the config file says this droplet should run on this hypervisor
+		// attempt to start the droplet here. use this even if the hypervisor is inactive?
+		if d.PreferredHypervisor == h.pb.Hostname {
+			ok, b := h.start(d)
+			if ok {
+				return result + b, nil
+			}
+			return result + b, errors.New("start " + name + " on hypervisor " + h.pb.Hostname)
+		}
+
+		result += fmt.Sprintln("hypervisor ready:", name, "for", h.pb.Hostname, h.pb.Active)
+		pool = append(pool, h)
+	}
+
+	// left here as an example of how to actually do random numbers
+	// it's complete mathematical chaos. Randomness is simple when
+	// human interaction occurs -- which is exactly what happens most
+	// of the time. most random shit is bullshit. all you really need
+	// is exactly this to make sure the random functions work as they
+	// should. Probably, just use this everywhere in all cases. --jcarr
+	rand.Seed(time.Now().UnixNano())
+	a := 0
+	b := len(pool)
+	n := a + rand.Intn(b-a)
+	result += fmt.Sprintln("pool has", len(pool), "members", "rand =", n)
+	h := pool[n]
+
+	// update/resend the search directories to the hypervisor
+	result += fmt.Sprintln("h.sendDirs() HERE")
+	result += fmt.Sprintln("h.sendDirs() HERE")
+	h.sendDirs()
+
+	ok, output := h.start(d)
+	if ok {
+		return result + output, nil
+	}
+	return result + output, errors.New("start " + name + " on hypervisor " + h.pb.Hostname)
+}