From a34d33863a593d63ca3a0a58ba0650bfc968297e Mon Sep 17 00:00:00 2001
From: Kushal Das <kushaldas@gmail.com>
Date: Nov 03 2015 14:34:30 +0000
Subject: we have working start_instance.


---

diff --git a/src/controller/controller.go b/src/controller/controller.go
index ae611a1..99877ce 100644
--- a/src/controller/controller.go
+++ b/src/controller/controller.go
@@ -3,6 +3,7 @@ package controller
 import (
 	"computer"
 	"encoding/json"
+	"fmt"
 	"logging"
 	"os"
 	"redis_op"
@@ -28,6 +29,20 @@ func Safe_schedule(cpu, ram int) bool {
 	}
 }
 
+/*
+Checks for path.
+*/
+func exists(path string) bool {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true
+	}
+	if os.IsNotExist(err) {
+		return false
+	}
+	return false
+}
+
 /* Saves the system db to the disk */
 func Save_sdb(path string) {
 	f, _ := os.Create(path)
@@ -63,16 +78,30 @@ func Start_service() {
 			}
 			// Means we have safe amount of CPU and RAM
 			image_name := job["diskname"].(string)
+			instance_name := job["name"].(string)
 			image_path := redis_op.Hget("image-list", image_name)
-			Start_instance(cpu, ram, string(image_path))
+			save_instance_details(job, instance_name)
+			Start_instance(cpu, ram, string(image_path), instance_name)
 		}
 	}
 }
 
-/* To go through all steps and start an instance.*/
-func Start_instance(cpu, ram int, image_path string) {
+func save_instance_details(job redis_op.Job, instance_name string) {
+	filename := fmt.Sprintf("%s.json", instance_name)
+	if !exists(filename) {
+		f, _ := os.Create(filename)
+		enc := json.NewEncoder(f)
+		enc.Encode(job)
+		f.Close()
+
+	}
 
-	computer.Setup_storage_instance(image_path, "i-foo", "/var/lib/libvirt/images/", "10G", "/dev/sda1")
-	computer.Setup_instance("i-foo", "/var/lib/libvirt/images/i-foo.qcow2", strconv.Itoa(ram), strconv.Itoa(cpu))
+}
+
+/* To go through all steps and start an instance.*/
+func Start_instance(cpu, ram int, image_path, instance_name string) {
+	instance_path := fmt.Sprintf("/var/lib/libvirt/images/%s.qcow2", instance_name)
+	computer.Setup_storage_instance(image_path, instance_name, "/var/lib/libvirt/images/", "10G", "/dev/sda1")
+	computer.Setup_instance(instance_name, instance_path, strconv.Itoa(ram), strconv.Itoa(cpu))
 
 }