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package operations
import (
"errors"
"fmt"
"github.com/gogo/protobuf/proto"
"github.com/mesos/mesos-go/api/v1/lib"
rez "github.com/mesos/mesos-go/api/v1/lib/resources"
)
type (
operationErrorType int
operationError struct {
errorType operationErrorType
opType mesos.Offer_Operation_Type
cause error
}
offerResourceOp func(*mesos.Offer_Operation, mesos.Resources) (mesos.Resources, error)
opErrorHandler func(cause error) error
)
const (
operationErrorTypeInvalid operationErrorType = iota
operationErrorTypeUnknown
)
var (
opNoop = func(_ *mesos.Offer_Operation, _ mesos.Resources) (_ mesos.Resources, _ error) { return }
offerResourceOpMap = map[mesos.Offer_Operation_Type]offerResourceOp{
mesos.Offer_Operation_LAUNCH: opNoop,
mesos.Offer_Operation_LAUNCH_GROUP: opNoop,
mesos.Offer_Operation_RESERVE: handleOpErrors(invalidOp(mesos.Offer_Operation_RESERVE), validateOpTotals(opReserve)),
mesos.Offer_Operation_UNRESERVE: handleOpErrors(invalidOp(mesos.Offer_Operation_UNRESERVE), validateOpTotals(opUnreserve)),
mesos.Offer_Operation_CREATE: handleOpErrors(invalidOp(mesos.Offer_Operation_CREATE), validateOpTotals(opCreate)),
mesos.Offer_Operation_DESTROY: handleOpErrors(invalidOp(mesos.Offer_Operation_DESTROY), validateOpTotals(opDestroy)),
}
)
func (err *operationError) Cause() error { return err.cause }
func (err *operationError) Type() operationErrorType { return err.errorType }
func (err *operationError) Operation() mesos.Offer_Operation_Type { return err.opType }
func (err *operationError) Error() string {
switch err.errorType {
case operationErrorTypeInvalid:
return fmt.Sprintf("invalid "+err.opType.String()+" operation: %+v", err.cause)
case operationErrorTypeUnknown:
return err.cause.Error()
default:
return fmt.Sprintf("operation error: %+v", err.cause)
}
}
func invalidOp(t mesos.Offer_Operation_Type) opErrorHandler {
return func(cause error) error {
return &operationError{errorType: operationErrorTypeInvalid, opType: t, cause: cause}
}
}
func handleOpErrors(f opErrorHandler, op offerResourceOp) offerResourceOp {
return func(operation *mesos.Offer_Operation, resources mesos.Resources) (mesos.Resources, error) {
result, err := op(operation, resources)
if err != nil {
err = f(err)
}
return result, err
}
}
func validateOpTotals(f offerResourceOp) offerResourceOp {
return func(operation *mesos.Offer_Operation, resources mesos.Resources) (mesos.Resources, error) {
result, err := f(operation, resources)
if err == nil {
// sanity CHECK, same as apache/mesos does
if !rez.SumAndCompare(resources, result...) {
panic(fmt.Sprintf("result %+v != resources %+v", result, resources))
}
}
return result, err
}
}
func opReserve(operation *mesos.Offer_Operation, resources mesos.Resources) (mesos.Resources, error) {
result := resources.Clone()
opRes := operation.GetReserve().GetResources()
err := rez.Validate(opRes...)
if err != nil {
return nil, err
}
for i := range opRes {
if !opRes[i].IsReserved("") {
return nil, errors.New("Resource must be reserved")
}
if opRes[i].GetReservation() == nil {
return nil, errors.New("missing 'reservation'")
}
unreserved := rez.Flatten(mesos.Resources{opRes[i]})
if !rez.ContainsAll(result, unreserved) {
return nil, fmt.Errorf("%+v does not contain %+v", result, unreserved)
}
result.Subtract(unreserved...)
result.Add1(opRes[i])
}
return result, nil
}
func opUnreserve(operation *mesos.Offer_Operation, resources mesos.Resources) (mesos.Resources, error) {
result := resources.Clone()
opRes := operation.GetUnreserve().GetResources()
err := rez.Validate(opRes...)
if err != nil {
return nil, err
}
for i := range opRes {
if !opRes[i].IsReserved("") {
return nil, errors.New("Resource is not reserved")
}
if opRes[i].GetReservation() == nil {
return nil, errors.New("missing 'reservation'")
}
if !rez.Contains(result, opRes[i]) {
return nil, errors.New("resources do not contain unreserve amount") //TODO(jdef) should output nicely formatted resource quantities here
}
unreserved := rez.Flatten(mesos.Resources{opRes[i]})
result.Subtract1(opRes[i])
result.Add(unreserved...)
}
return result, nil
}
func opCreate(operation *mesos.Offer_Operation, resources mesos.Resources) (mesos.Resources, error) {
result := resources.Clone()
volumes := operation.GetCreate().GetVolumes()
err := rez.Validate(volumes...)
if err != nil {
return nil, err
}
for i := range volumes {
if volumes[i].GetDisk() == nil {
return nil, errors.New("missing 'disk'")
}
if volumes[i].GetDisk().GetPersistence() == nil {
return nil, errors.New("missing 'persistence'")
}
// from: https://github.com/apache/mesos/blob/master/src/common/resources.cpp
// Strip the disk info so that we can subtract it from the
// original resources.
// TODO(jieyu): Non-persistent volumes are not supported for
// now. Persistent volumes can only be be created from regular
// disk resources. Revisit this once we start to support
// non-persistent volumes.
stripped := proto.Clone(&volumes[i]).(*mesos.Resource)
stripped.Disk = nil
if !rez.Contains(result, *stripped) {
return nil, errors.New("invalid CREATE operation: insufficient disk resources")
}
result.Subtract1(*stripped)
result.Add1(volumes[i])
}
return result, nil
}
func opDestroy(operation *mesos.Offer_Operation, resources mesos.Resources) (mesos.Resources, error) {
result := resources.Clone()
volumes := operation.GetDestroy().GetVolumes()
err := rez.Validate(volumes...)
if err != nil {
return nil, err
}
for i := range volumes {
if volumes[i].GetDisk() == nil {
return nil, errors.New("missing 'disk'")
}
if volumes[i].GetDisk().GetPersistence() == nil {
return nil, errors.New("missing 'persistence'")
}
if !rez.Contains(result, volumes[i]) {
return nil, errors.New("persistent volume does not exist")
}
stripped := proto.Clone(&volumes[i]).(*mesos.Resource)
stripped.Disk = nil
result.Subtract1(volumes[i])
result.Add1(*stripped)
}
return result, nil
}
func Apply(operation *mesos.Offer_Operation, resources []mesos.Resource) ([]mesos.Resource, error) {
f, ok := offerResourceOpMap[operation.GetType()]
if !ok {
return nil, &operationError{
errorType: operationErrorTypeUnknown,
cause: errors.New("unknown offer operation: " + operation.GetType().String()),
}
}
return f(operation, resources)
}
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