github.com/cloud-green/juju@v0.0.0-20151002100041-a00291338d3d/provider/vsphere/environ_instance.go (about)

     1  // Copyright 2015 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  // +build !gccgo
     5  
     6  package vsphere
     7  
     8  import (
     9  	"strings"
    10  
    11  	"github.com/juju/errors"
    12  
    13  	"github.com/juju/juju/environs"
    14  	"github.com/juju/juju/instance"
    15  	"github.com/juju/juju/provider/common"
    16  )
    17  
    18  // Instances returns the available instances in the environment that
    19  // match the provided instance IDs. For IDs that did not match any
    20  // instances, the result at the corresponding index will be nil. In that
    21  // case the error will be environs.ErrPartialInstances (or
    22  // ErrNoInstances if none of the IDs match an instance).
    23  func (env *environ) Instances(ids []instance.Id) ([]instance.Instance, error) {
    24  	if len(ids) == 0 {
    25  		return nil, environs.ErrNoInstances
    26  	}
    27  
    28  	instances, err := env.instances()
    29  	if err != nil {
    30  		// We don't return the error since we need to pack one instance
    31  		// for each ID into the result. If there is a problem then we
    32  		// will return either ErrPartialInstances or ErrNoInstances.
    33  		// TODO(ericsnow) Skip returning here only for certain errors?
    34  		logger.Errorf("failed to get instances from vmware: %v", err)
    35  		err = errors.Trace(err)
    36  	}
    37  
    38  	// Build the result, matching the provided instance IDs.
    39  	numFound := 0 // This will never be greater than len(ids).
    40  	results := make([]instance.Instance, len(ids))
    41  	for i, id := range ids {
    42  		inst := findInst(id, instances)
    43  		if inst != nil {
    44  			numFound++
    45  		}
    46  		results[i] = inst
    47  	}
    48  
    49  	if numFound == 0 {
    50  		if err == nil {
    51  			err = environs.ErrNoInstances
    52  		}
    53  	} else if numFound != len(ids) {
    54  		err = environs.ErrPartialInstances
    55  	}
    56  	return results, err
    57  }
    58  
    59  // instances returns a list of all "alive" instances in the environment.
    60  // This means only instances where the IDs match
    61  // "juju-<env name>-machine-*". This is important because otherwise juju
    62  // will see they are not tracked in state, assume they're stale/rogue,
    63  // and shut them down.
    64  func (env *environ) instances() ([]instance.Instance, error) {
    65  	env = env.getSnapshot()
    66  
    67  	prefix := common.MachineFullName(env, "")
    68  	instances, err := env.client.Instances(prefix)
    69  	err = errors.Trace(err)
    70  
    71  	// Turn mo.VirtualMachine values into *environInstance values,
    72  	// whether or not we got an error.
    73  	var results []instance.Instance
    74  	for _, base := range instances {
    75  		inst := newInstance(base, env)
    76  		results = append(results, inst)
    77  	}
    78  
    79  	return results, err
    80  }
    81  
    82  // StateServerInstances returns the IDs of the instances corresponding
    83  // to juju state servers.
    84  func (env *environ) StateServerInstances() ([]instance.Id, error) {
    85  	env = env.getSnapshot()
    86  
    87  	prefix := common.MachineFullName(env, "")
    88  	instances, err := env.client.Instances(prefix)
    89  	if err != nil {
    90  		return nil, errors.Trace(err)
    91  	}
    92  
    93  	var results []instance.Id
    94  	for _, inst := range instances {
    95  		metadata := inst.Config.ExtraConfig
    96  		for _, item := range metadata {
    97  			value := item.GetOptionValue()
    98  			if value.Key == metadataKeyIsState && value.Value == metadataValueIsState {
    99  				results = append(results, instance.Id(inst.Name))
   100  				break
   101  			}
   102  		}
   103  	}
   104  	if len(results) == 0 {
   105  		return nil, environs.ErrNotBootstrapped
   106  	}
   107  	return results, nil
   108  }
   109  
   110  // parsePlacement extracts the availability zone from the placement
   111  // string and returns it. If no zone is found there then an error is
   112  // returned.
   113  func (env *environ) parsePlacement(placement string) (*vmwareAvailZone, error) {
   114  	if placement == "" {
   115  		return nil, nil
   116  	}
   117  
   118  	pos := strings.IndexRune(placement, '=')
   119  	if pos == -1 {
   120  		return nil, errors.Errorf("unknown placement directive: %v", placement)
   121  	}
   122  
   123  	switch key, value := placement[:pos], placement[pos+1:]; key {
   124  	case "zone":
   125  		zone, err := env.availZone(value)
   126  		if err != nil {
   127  			return nil, errors.Trace(err)
   128  		}
   129  		return zone, nil
   130  	}
   131  	return nil, errors.Errorf("unknown placement directive: %v", placement)
   132  }