github.com/makyo/juju@v0.0.0-20160425123129-2608902037e9/worker/diskmanager/diskmanager_test.go (about)

     1  // Copyright 2014 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package diskmanager_test
     5  
     6  import (
     7  	"time"
     8  
     9  	jc "github.com/juju/testing/checkers"
    10  	gc "gopkg.in/check.v1"
    11  
    12  	"github.com/juju/juju/storage"
    13  	coretesting "github.com/juju/juju/testing"
    14  	"github.com/juju/juju/worker/diskmanager"
    15  )
    16  
    17  var _ = gc.Suite(&DiskManagerWorkerSuite{})
    18  
    19  type DiskManagerWorkerSuite struct {
    20  	coretesting.BaseSuite
    21  }
    22  
    23  func (s *DiskManagerWorkerSuite) SetUpTest(c *gc.C) {
    24  	s.BaseSuite.SetUpTest(c)
    25  	s.PatchValue(diskmanager.BlockDeviceInUse, func(storage.BlockDevice) (bool, error) {
    26  		return false, nil
    27  	})
    28  }
    29  
    30  func (s *DiskManagerWorkerSuite) TestWorker(c *gc.C) {
    31  	done := make(chan struct{})
    32  	var setDevices BlockDeviceSetterFunc = func(devices []storage.BlockDevice) error {
    33  		close(done)
    34  		return nil
    35  	}
    36  
    37  	var listDevices diskmanager.ListBlockDevicesFunc = func() ([]storage.BlockDevice, error) {
    38  		return []storage.BlockDevice{{DeviceName: "whatever"}}, nil
    39  	}
    40  
    41  	w := diskmanager.NewWorker(listDevices, setDevices)
    42  	defer w.Wait()
    43  	defer w.Kill()
    44  
    45  	select {
    46  	case <-done:
    47  	case <-time.After(coretesting.LongWait):
    48  		c.Fatalf("timed out waiting for diskmanager to update")
    49  	}
    50  }
    51  
    52  func (s *DiskManagerWorkerSuite) TestBlockDeviceChanges(c *gc.C) {
    53  	var oldDevices []storage.BlockDevice
    54  	var devicesSet [][]storage.BlockDevice
    55  	var setDevices BlockDeviceSetterFunc = func(devices []storage.BlockDevice) error {
    56  		devicesSet = append(devicesSet, devices)
    57  		return nil
    58  	}
    59  
    60  	var listDevices diskmanager.ListBlockDevicesFunc = func() ([]storage.BlockDevice, error) {
    61  		return []storage.BlockDevice{{DeviceName: "sda"}}, nil
    62  	}
    63  	for i := 0; i < 2; i++ {
    64  		err := diskmanager.DoWork(listDevices, setDevices, &oldDevices)
    65  		c.Assert(err, jc.ErrorIsNil)
    66  	}
    67  
    68  	listDevices = func() ([]storage.BlockDevice, error) {
    69  		return []storage.BlockDevice{{DeviceName: "sdb"}}, nil
    70  	}
    71  	err := diskmanager.DoWork(listDevices, setDevices, &oldDevices)
    72  	c.Assert(err, jc.ErrorIsNil)
    73  
    74  	// diskmanager only calls the BlockDeviceSetter when it sees
    75  	// a change in disks.
    76  	c.Assert(devicesSet, gc.HasLen, 2)
    77  	c.Assert(devicesSet[0], gc.DeepEquals, []storage.BlockDevice{{
    78  		DeviceName: "sda",
    79  	}})
    80  	c.Assert(devicesSet[1], gc.DeepEquals, []storage.BlockDevice{{
    81  		DeviceName: "sdb",
    82  	}})
    83  }
    84  
    85  func (s *DiskManagerWorkerSuite) TestBlockDevicesSorted(c *gc.C) {
    86  	var devicesSet [][]storage.BlockDevice
    87  	var setDevices BlockDeviceSetterFunc = func(devices []storage.BlockDevice) error {
    88  		devicesSet = append(devicesSet, devices)
    89  		return nil
    90  	}
    91  
    92  	var listDevices diskmanager.ListBlockDevicesFunc = func() ([]storage.BlockDevice, error) {
    93  		return []storage.BlockDevice{{
    94  			DeviceName: "sdb",
    95  		}, {
    96  			DeviceName: "sda",
    97  		}, {
    98  			DeviceName: "sdc",
    99  		}}, nil
   100  	}
   101  	err := diskmanager.DoWork(listDevices, setDevices, new([]storage.BlockDevice))
   102  	c.Assert(err, jc.ErrorIsNil)
   103  
   104  	// The block Devices should be sorted when passed to the block
   105  	// device setter.
   106  	c.Assert(devicesSet, gc.DeepEquals, [][]storage.BlockDevice{{{
   107  		DeviceName: "sda",
   108  	}, {
   109  		DeviceName: "sdb",
   110  	}, {
   111  		DeviceName: "sdc",
   112  	}}})
   113  }
   114  
   115  type BlockDeviceSetterFunc func([]storage.BlockDevice) error
   116  
   117  func (f BlockDeviceSetterFunc) SetMachineBlockDevices(devices []storage.BlockDevice) error {
   118  	return f(devices)
   119  }