// AddUnits starts n units of the given service using the specified placement
// directives to allocate the machines.
func AddUnits(st *state.State, svc *state.Service, n int, placement []*instance.Placement) ([]*state.Unit, error) {
units := make([]*state.Unit, n)
// Hard code for now till we implement a different approach.
policy := state.AssignCleanEmpty
// All units should have the same networks as the service.
networks, err := svc.Networks()
if err != nil {
return nil, errors.Errorf("cannot get service %q networks", svc.Name())
}
// TODO what do we do if we fail half-way through this process?
for i := 0; i < n; i++ {
unit, err := svc.AddUnit()
if err != nil {
return nil, errors.Annotatef(err, "cannot add unit %d/%d to service %q", i+1, n, svc.Name())
}
// Are there still placement directives to use?
if i > len(placement)-1 {
if err := st.AssignUnit(unit, policy); err != nil {
return nil, errors.Trace(err)
}
units[i] = unit
continue
}
if err := st.AssignUnitWithPlacement(unit, placement[i], networks); err != nil {
return nil, errors.Annotatef(err, "adding new machine to host unit %q", unit.Name())
}
units[i] = unit
}
return units, nil
}
func (context *statusContext) processService(service *state.Service) (status params.ServiceStatus) {
serviceCharmURL, _ := service.CharmURL()
status.Charm = serviceCharmURL.String()
status.Exposed = service.IsExposed()
status.Life = processLife(service)
latestCharm, ok := context.latestCharms[*serviceCharmURL.WithRevision(-1)]
if ok && latestCharm != serviceCharmURL.String() {
status.CanUpgradeTo = latestCharm
}
var err error
status.Relations, status.SubordinateTo, err = context.processServiceRelations(service)
if err != nil {
status.Err = err
return
}
networks, err := service.Networks()
if err != nil {
status.Err = err
return
}
var cons constraints.Value
if service.IsPrincipal() {
// Only principals can have constraints.
cons, err = service.Constraints()
if err != nil {
status.Err = err
return
}
}
// TODO(dimitern): Drop support for this in a follow-up.
if len(networks) > 0 || cons.HaveNetworks() {
// Only the explicitly requested networks (using "juju deploy
// <svc> --networks=...") will be enabled, and altough when
// specified, networks constraints will be used for instance
// selection, they won't be actually enabled.
status.Networks = params.NetworksSpecification{
Enabled: networks,
Disabled: append(cons.IncludeNetworks(), cons.ExcludeNetworks()...),
}
}
if service.IsPrincipal() {
status.Units = context.processUnits(context.units[service.Name()], serviceCharmURL.String())
serviceStatus, err := service.Status()
if err != nil {
status.Err = err
return
}
status.Status.Status = params.Status(serviceStatus.Status)
status.Status.Info = serviceStatus.Message
status.Status.Data = serviceStatus.Data
status.Status.Since = serviceStatus.Since
status.MeterStatuses = context.processUnitMeterStatuses(context.units[service.Name()])
}
return status
}
func buildServiceMatcherShims(s *state.Service, patterns ...string) (shims []closurePredicate, _ error) {
// Match on name.
shims = append(shims, func() (bool, bool, error) {
for _, p := range patterns {
if strings.ToLower(s.Name()) == strings.ToLower(p) {
return true, true, nil
}
}
return false, false, nil
})
// Match on exposure.
shims = append(shims, func() (bool, bool, error) { return matchExposure(patterns, s) })
// Match on network addresses.
networks, err := s.Networks()
if err != nil {
return nil, err
}
shims = append(shims, func() (bool, bool, error) { return matchSubnet(patterns, networks...) })
// If the service has an unit instance that matches any of the
// given criteria, consider the service a match as well.
unitShims, err := buildShimsForUnit(s.AllUnits, patterns...)
if err != nil {
return nil, err
}
shims = append(shims, unitShims...)
// Units may be able to match the pattern. Ultimately defer to
// that logic, and guard against breaking the predicate-chain.
if len(unitShims) <= 0 {
shims = append(shims, func() (bool, bool, error) { return false, true, nil })
}
return shims, nil
}
// AddUnits starts n units of the given service and allocates machines
// to them as necessary.
func AddUnits(st *state.State, svc *state.Service, n int, machineIdSpec string) ([]*state.Unit, error) {
units := make([]*state.Unit, n)
// Hard code for now till we implement a different approach.
policy := state.AssignCleanEmpty
// All units should have the same networks as the service.
networks, err := svc.Networks()
if err != nil {
return nil, fmt.Errorf("cannot get service %q networks: %v", svc.Name(), err)
}
// TODO what do we do if we fail half-way through this process?
for i := 0; i < n; i++ {
unit, err := svc.AddUnit()
if err != nil {
return nil, fmt.Errorf("cannot add unit %d/%d to service %q: %v", i+1, n, svc.Name(), err)
}
if machineIdSpec != "" {
if n != 1 {
return nil, fmt.Errorf("cannot add multiple units of service %q to a single machine", svc.Name())
}
// machineIdSpec may be an existing machine or container, eg 3/lxc/2
// or a new container on a machine, eg lxc:3
mid := machineIdSpec
var containerType instance.ContainerType
specParts := strings.SplitN(machineIdSpec, ":", 2)
if len(specParts) > 1 {
firstPart := specParts[0]
var err error
if containerType, err = instance.ParseContainerType(firstPart); err == nil {
mid = specParts[1]
} else {
mid = machineIdSpec
}
}
if !names.IsMachine(mid) {
return nil, fmt.Errorf("invalid force machine id %q", mid)
}
var unitCons *constraints.Value
unitCons, err = unit.Constraints()
if err != nil {
return nil, err
}
var err error
var m *state.Machine
// If a container is to be used, create it.
if containerType != "" {
// Create the new machine marked as dirty so that
// nothing else will grab it before we assign the unit to it.
template := state.MachineTemplate{
Series: unit.Series(),
Jobs: []state.MachineJob{state.JobHostUnits},
Dirty: true,
Constraints: *unitCons,
RequestedNetworks: networks,
}
m, err = st.AddMachineInsideMachine(template, mid, containerType)
} else {
m, err = st.Machine(mid)
}
if err != nil {
return nil, fmt.Errorf("cannot assign unit %q to machine: %v", unit.Name(), err)
}
err = unit.AssignToMachine(m)
if err != nil {
return nil, err
}
} else if err := st.AssignUnit(unit, policy); err != nil {
return nil, err
}
units[i] = unit
}
return units, nil
}