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|
package schedulerhints
import (
"fmt"
"net"
"regexp"
"strings"
"github.com/rackspace/gophercloud/openstack/compute/v2/servers"
)
// SchedulerHints represents a set of scheduling hints that are passed to the
// OpenStack scheduler
type SchedulerHints struct {
// Group specifies a Server Group to place the instance in.
Group string
// DifferentHost will place the instance on a compute node that does not
// host the given instances.
DifferentHost []string
// SameHost will place the instance on a compute node that hosts the given
// instances.
SameHost []string
// Query is a conditional statement that results in compute nodes able to
// host the instance.
Query []interface{}
// TargetCell specifies a cell name where the instance will be placed.
TargetCell string
// BuildNearHostIP specifies a subnet of compute nodes to host the instance.
BuildNearHostIP string
}
// SchedulerHintsBuilder builds the scheduler hints into a serializable format.
type SchedulerHintsBuilder interface {
ToServerSchedulerHintsMap() (map[string]interface{}, error)
}
// ToServerSchedulerHintsMap builds the scheduler hints into a serializable format.
func (opts SchedulerHints) ToServerSchedulerHintsMap() (map[string]interface{}, error) {
sh := make(map[string]interface{})
uuidRegex, _ := regexp.Compile("^[a-z0-9]{8}-[a-z0-9]{4}-[1-5][a-z0-9]{3}-[a-z0-9]{4}-[a-z0-9]{12}$")
if opts.Group != "" {
if !uuidRegex.MatchString(opts.Group) {
return nil, fmt.Errorf("Group must be a UUID")
}
sh["group"] = opts.Group
}
if len(opts.DifferentHost) > 0 {
for _, diffHost := range opts.DifferentHost {
if !uuidRegex.MatchString(diffHost) {
return nil, fmt.Errorf("The hosts in DifferentHost must be in UUID format.")
}
}
sh["different_host"] = opts.DifferentHost
}
if len(opts.SameHost) > 0 {
for _, sameHost := range opts.SameHost {
if !uuidRegex.MatchString(sameHost) {
return nil, fmt.Errorf("The hosts in SameHost must be in UUID format.")
}
}
sh["same_host"] = opts.SameHost
}
/* Query can be something simple like:
[">=", "$free_ram_mb", 1024]
Or more complex like:
['and',
['>=', '$free_ram_mb', 1024],
['>=', '$free_disk_mb', 200 * 1024]
]
Because of the possible complexity, just make sure the length is a minimum of 3.
*/
if len(opts.Query) > 0 {
if len(opts.Query) < 3 {
return nil, fmt.Errorf("Query must be a conditional statement in the format of [op,variable,value]")
}
sh["query"] = opts.Query
}
if opts.TargetCell != "" {
sh["target_cell"] = opts.TargetCell
}
if opts.BuildNearHostIP != "" {
if _, _, err := net.ParseCIDR(opts.BuildNearHostIP); err != nil {
return nil, fmt.Errorf("BuildNearHostIP must be a valid subnet in the form 192.168.1.1/24")
}
ipParts := strings.Split(opts.BuildNearHostIP, "/")
sh["build_near_host_ip"] = ipParts[0]
sh["cidr"] = "/" + ipParts[1]
}
return sh, nil
}
// CreateOptsExt adds a SchedulerHints option to the base CreateOpts.
type CreateOptsExt struct {
servers.CreateOptsBuilder
// SchedulerHints provides a set of hints to the scheduler.
SchedulerHints SchedulerHintsBuilder
}
// ToServerCreateMap adds the SchedulerHints option to the base server creation options.
func (opts CreateOptsExt) ToServerCreateMap() (map[string]interface{}, error) {
base, err := opts.CreateOptsBuilder.ToServerCreateMap()
if err != nil {
return nil, err
}
schedulerHints, err := opts.SchedulerHints.ToServerSchedulerHintsMap()
if err != nil {
return nil, err
}
if len(schedulerHints) == 0 {
return base, nil
}
base["os:scheduler_hints"] = schedulerHints
return base, nil
}
|
