// blockDeviceCosts returns the total price of a slice of BlockDevices over the given duration
// by using the EC2 API.
func blockDeviceCosts(handle *ec2.EC2, devices []ec2.BlockDevice, dur time.Duration) (float64, error) {
cost := 0.0
if len(devices) > 0 {
volumeIds := []string{}
for _, bd := range devices {
volumeIds = append(volumeIds, bd.EBS.VolumeId)
}
vols, err := handle.Volumes(volumeIds, nil)
if err != nil {
return 0, err
}
for _, v := range vols.Volumes {
// an amazon region is just the availability zone minus the final letter
region := azToRegion(v.AvailZone)
size, err := strconv.Atoi(v.Size)
if err != nil {
return 0, fmt.Errorf("reading volume size: %v", err)
}
p, err := ebsCost(&pkgEBSFetcher, region, size, dur)
if err != nil {
return 0, fmt.Errorf("EBS volume %v: %v", v.VolumeId, err)
}
cost += p
}
}
return cost, nil
}
