Golang State.Machine方法代碼示例

// MachineConfig returns information from the environment config that is
// needed for machine cloud-init (for non-state servers only).
// It is exposed for testing purposes.
// TODO(rog) fix environs/manual tests so they do not need to
// call this, or move this elsewhere.
func MachineConfig(st *state.State, machineId, nonce, dataDir string) (*cloudinit.MachineConfig, error) {
	environConfig, err := st.EnvironConfig()
	if err != nil {
		return nil, err
	}

	// Get the machine so we can get its series and arch.
	// If the Arch is not set in hardware-characteristics,
	// an error is returned.
	machine, err := st.Machine(machineId)
	if err != nil {
		return nil, err
	}
	hc, err := machine.HardwareCharacteristics()
	if err != nil {
		return nil, err
	}
	if hc.Arch == nil {
		return nil, fmt.Errorf("arch is not set for %q", machine.Tag())
	}

	// Find the appropriate tools information.
	env, err := environs.New(environConfig)
	if err != nil {
		return nil, err
	}
	tools, err := findInstanceTools(env, machine.Series(), *hc.Arch)
	if err != nil {
		return nil, err
	}

	// Find the secrets and API endpoints.
	auth, err := environs.NewEnvironAuthenticator(env)
	if err != nil {
		return nil, err
	}
	stateInfo, apiInfo, err := auth.SetupAuthentication(machine)
	if err != nil {
		return nil, err
	}

	// Find requested networks.
	includeNetworks, excludeNetworks, err := machine.RequestedNetworks()
	if err != nil {
		return nil, err
	}

	mcfg := environs.NewMachineConfig(machineId, nonce, includeNetworks, excludeNetworks, stateInfo, apiInfo)
	if dataDir != "" {
		mcfg.DataDir = dataDir
	}
	mcfg.Tools = tools
	err = environs.FinishMachineConfig(mcfg, environConfig, constraints.Value{})
	if err != nil {
		return nil, err
	}
	return mcfg, nil
}

// commonServiceInstances returns instances with
// services in common with the specified machine.
func commonServiceInstances(st *state.State, m *state.Machine) ([]instance.Id, error) {
	units, err := m.Units()
	if err != nil {
		return nil, err
	}
	var instanceIdSet set.Strings
	for _, unit := range units {
		if !unit.IsPrincipal() {
			continue
		}
		service, err := unit.Service()
		if err != nil {
			return nil, err
		}
		allUnits, err := service.AllUnits()
		if err != nil {
			return nil, err
		}
		for _, unit := range allUnits {
			machineId, err := unit.AssignedMachineId()
			if state.IsNotAssigned(err) {
				continue
			} else if err != nil {
				return nil, err
			}
			machine, err := st.Machine(machineId)
			if err != nil {
				return nil, err
			}
			instanceId, err := machine.InstanceId()
			if err == nil {
				instanceIdSet.Add(string(instanceId))
			} else if state.IsNotProvisionedError(err) {
				continue
			} else {
				return nil, err
			}
		}
	}
	instanceIds := make([]instance.Id, instanceIdSet.Size())
	// Sort values to simplify testing.
	for i, instanceId := range instanceIdSet.SortedValues() {
		instanceIds[i] = instance.Id(instanceId)
	}
	return instanceIds, nil
}

// getAllUnits returns a list of all principal and subordinate units
// assigned to the given machine.
func getAllUnits(st *state.State, machineTag string) ([]string, error) {
	_, id, err := names.ParseTag(machineTag, names.MachineTagKind)
	if err != nil {
		return nil, err
	}
	machine, err := st.Machine(id)
	if err != nil {
		return nil, err
	}
	// Start a watcher on machine's units, read the initial event and stop it.
	watch := machine.WatchUnits()
	defer watch.Stop()
	if units, ok := <-watch.Changes(); ok {
		return units, nil
	}
	return nil, fmt.Errorf("cannot obtain units of machine %q: %v", machineTag, watch.Err())
}

// environManagerInstances returns all environ manager instances.
func environManagerInstances(st *state.State) ([]instance.Id, error) {
	info, err := st.StateServerInfo()
	if err != nil {
		return nil, err
	}
	instances := make([]instance.Id, 0, len(info.MachineIds))
	for _, id := range info.MachineIds {
		machine, err := st.Machine(id)
		if err != nil {
			return nil, err
		}
		instanceId, err := machine.InstanceId()
		if err == nil {
			instances = append(instances, instanceId)
		} else if !state.IsNotProvisionedError(err) {
			return nil, err
		}
	}
	return instances, 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.
	includeNetworks, excludeNetworks, 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 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,
					IncludeNetworks: includeNetworks,
					ExcludeNetworks: excludeNetworks,
				}
				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
}