// findInstanceSpec returns the InstanceSpec that best satisfies the supplied
// InstanceConstraint.
func findInstanceSpec(baseURLs []string, constraint instances.InstanceConstraint) (*instances.InstanceSpec, error) {
constraint.Constraints = defaultToBaselineSpec(constraint.Constraints)
imageData, err := findMatchingImages(constraint.Region, constraint.Series, constraint.Arches)
if err != nil {
return nil, err
}
images := instances.ImageMetadataToImages(imageData)
instanceTypes := listInstanceTypes(gwacl.RoleSizes)
return instances.FindInstanceSpec(images, &constraint, instanceTypes)
}
// findInstanceSpec returns an image and instance type satisfying the constraint.
// The instance type comes from querying the flavors supported by the deployment.
func findInstanceSpec(e *environ, ic *instances.InstanceConstraint) (*instances.InstanceSpec, error) {
// first construct all available instance types from the supported flavors.
nova := e.nova()
flavors, err := nova.ListFlavorsDetail()
if err != nil {
return nil, err
}
allInstanceTypes := []instances.InstanceType{}
for _, flavor := range flavors {
instanceType := instances.InstanceType{
Id: flavor.Id,
Name: flavor.Name,
Arches: ic.Arches,
Mem: uint64(flavor.RAM),
CpuCores: uint64(flavor.VCPUs),
}
allInstanceTypes = append(allInstanceTypes, instanceType)
}
imageConstraint := imagemetadata.ImageConstraint{
CloudSpec: imagemetadata.CloudSpec{ic.Region, e.ecfg().authURL()},
Series: ic.Series,
Arches: ic.Arches,
}
baseURLs, err := e.getImageBaseURLs()
if err != nil {
return nil, err
}
// TODO (wallyworld): use an env parameter (default true) to mandate use of only signed image metadata.
matchingImages, err := imagemetadata.Fetch(baseURLs, imagemetadata.DefaultIndexPath, &imageConstraint, false)
if err != nil {
return nil, err
}
images := instances.ImageMetadataToImages(matchingImages)
spec, err := instances.FindInstanceSpec(images, ic, allInstanceTypes)
if err != nil {
return nil, err
}
return spec, nil
}
// findInstanceSpec returns an InstanceSpec satisfying the supplied instanceConstraint.
func findInstanceSpec(baseURLs []string, ic *instances.InstanceConstraint) (*instances.InstanceSpec, error) {
if ic.Constraints.CpuPower == nil {
ic.Constraints.CpuPower = instances.CpuPower(defaultCpuPower)
}
ec2Region := allRegions[ic.Region]
imageConstraint := imagemetadata.ImageConstraint{
CloudSpec: imagemetadata.CloudSpec{ic.Region, ec2Region.EC2Endpoint},
Series: ic.Series,
Arches: ic.Arches,
}
matchingImages, err := imagemetadata.Fetch(
baseURLs, imagemetadata.DefaultIndexPath, &imageConstraint, signedImageDataOnly)
if err != nil {
return nil, err
}
if len(matchingImages) == 0 {
logger.Warningf("no matching image meta data for constraints: %v", ic)
}
suitableImages := filterImages(matchingImages)
images := instances.ImageMetadataToImages(suitableImages)
// Make a copy of the known EC2 instance types, filling in the cost for the specified region.
regionCosts := allRegionCosts[ic.Region]
if len(regionCosts) == 0 && len(allRegionCosts) > 0 {
return nil, fmt.Errorf("no instance types found in %s", ic.Region)
}
var itypesWithCosts []instances.InstanceType
for _, itype := range allInstanceTypes {
cost, ok := regionCosts[itype.Name]
if !ok {
continue
}
itWithCost := itype
itWithCost.Cost = cost
itypesWithCosts = append(itypesWithCosts, itWithCost)
}
return instances.FindInstanceSpec(images, ic, itypesWithCosts)
}