// match returns true if itype can satisfy the supplied constraints. If so,
// it also returns a copy of itype with any arches that do not match the
// constraints filtered out.
func (itype InstanceType) match(cons constraints.Value) (InstanceType, bool) {
nothing := InstanceType{}
if cons.Arch != nil {
itype.Arches = filterArches(itype.Arches, []string{*cons.Arch})
}
if itype.Deprecated && !cons.HasInstanceType() {
return nothing, false
}
if cons.HasInstanceType() && itype.Name != *cons.InstanceType {
return nothing, false
}
if len(itype.Arches) == 0 {
return nothing, false
}
if cons.CpuCores != nil && itype.CpuCores < *cons.CpuCores {
return nothing, false
}
if cons.CpuPower != nil && itype.CpuPower != nil && *itype.CpuPower < *cons.CpuPower {
return nothing, false
}
if cons.Mem != nil && itype.Mem < *cons.Mem {
return nothing, false
}
if cons.RootDisk != nil && itype.RootDisk > 0 && itype.RootDisk < *cons.RootDisk {
return nothing, false
}
if cons.Tags != nil && len(*cons.Tags) > 0 && !tagsMatch(*cons.Tags, itype.Tags) {
return nothing, false
}
if cons.HasVirtType() && (itype.VirtType == nil || *itype.VirtType != *cons.VirtType) {
return nothing, false
}
return itype, true
}
// MatchingInstanceTypes returns all instance types matching constraints and available
// in region, sorted by increasing region-specific cost (if known).
func MatchingInstanceTypes(allInstanceTypes []InstanceType, region string, cons constraints.Value) ([]InstanceType, error) {
var itypes []InstanceType
// Rules used to select instance types:
// - non memory constraints like cpu-cores etc are always honoured
// - if no mem constraint specified and instance-type not specified,
// try opinionated default with enough mem to run a server.
// - if no matches and no mem constraint specified, try again and
// return any matching instance with the largest memory
origCons := cons
if !cons.HasInstanceType() && cons.Mem == nil {
minMem := uint64(minMemoryHeuristic)
cons.Mem = &minMem
}
itypes = matchingTypesForConstraint(allInstanceTypes, cons)
// No matches using opinionated default, so if no mem constraint specified,
// look for matching instance with largest memory.
if len(itypes) == 0 && cons.Mem != origCons.Mem {
itypes = matchingTypesForConstraint(allInstanceTypes, origCons)
if len(itypes) > 0 {
sort.Sort(byMemory(itypes))
itypes = []InstanceType{itypes[len(itypes)-1]}
}
}
// If we have matching instance types, we can return those, sorted by cost.
if len(itypes) > 0 {
sort.Sort(byCost(itypes))
return itypes, nil
}
// No luck, so report the error.
return nil, fmt.Errorf("no instance types in %s matching constraints %q", region, origCons)
}
// PrecheckInstance verifies that the provided series and constraints
// are valid for use in creating an instance in this environment.
func (env *environ) PrecheckInstance(series string, cons constraints.Value, placement string) error {
if _, err := env.parsePlacement(placement); err != nil {
return errors.Trace(err)
}
if cons.HasInstanceType() {
return errors.Errorf("LXD does not support instance types (got %q)", *cons.InstanceType)
}
return nil
}
// PrecheckInstance verifies that the provided series and constraints
// are valid for use in creating an instance in this environment.
func (env *environ) PrecheckInstance(series string, cons constraints.Value, placement string) error {
if _, err := env.parsePlacement(placement); err != nil {
return errors.Trace(err)
}
if cons.HasInstanceType() {
if !checkInstanceType(cons) {
return errors.Errorf("invalid GCE instance type %q", *cons.InstanceType)
}
}
return nil
}
// PrecheckInstance is defined on the state.Prechecker interface.
func (env *joyentEnviron) PrecheckInstance(series string, cons constraints.Value, placement string) error {
if placement != "" {
return fmt.Errorf("unknown placement directive: %s", placement)
}
if !cons.HasInstanceType() {
return nil
}
// Constraint has an instance-type constraint so let's see if it is valid.
instanceTypes, err := env.listInstanceTypes()
if err != nil {
return err
}
for _, instanceType := range instanceTypes {
if instanceType.Name == *cons.InstanceType {
return nil
}
}
return fmt.Errorf("invalid Joyent instance %q specified", *cons.InstanceType)
}
// PrecheckInstance is defined on the state.Prechecker interface.
func (e *Environ) PrecheckInstance(series string, cons constraints.Value, placement string) error {
if placement != "" {
if _, err := e.parsePlacement(placement); err != nil {
return err
}
}
if !cons.HasInstanceType() {
return nil
}
// Constraint has an instance-type constraint so let's see if it is valid.
novaClient := e.nova()
flavors, err := novaClient.ListFlavorsDetail()
if err != nil {
return err
}
for _, flavor := range flavors {
if flavor.Name == *cons.InstanceType {
return nil
}
}
return errors.Errorf("invalid Openstack flavour %q specified", *cons.InstanceType)
}