// 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)
}
var images []instances.Image
for _, imageMetadata := range matchingImages {
// For now, we only want images with "ebs" storage.
if imageMetadata.Storage != ebsStorage {
continue
}
im := *imageMetadata
images = append(images, instances.Image{
Id: im.Id,
VType: im.VType,
Arch: im.Arch,
})
}
// 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)
}
var (
amd64 = []string{"amd64"}
both = []string{"amd64", "i386"}
)
// allRegions is defined here to allow tests to override the content.
var allRegions = aws.Regions
// allInstanceTypes holds the relevant attributes of every known
// instance type.
var allInstanceTypes = []instances.InstanceType{
{ // First generation.
Name: "m1.small",
Arches: both,
CpuCores: 1,
CpuPower: instances.CpuPower(100),
Mem: 1740,
VType: ¶virtual,
}, {
Name: "m1.medium",
Arches: both,
CpuCores: 1,
CpuPower: instances.CpuPower(200),
Mem: 3840,
VType: ¶virtual,
}, {
Name: "m1.large",
Arches: amd64,
CpuCores: 2,
CpuPower: instances.CpuPower(400),
Mem: 7680,
