73370239d2
According to http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/device_naming.html we can only use /dev/xvd[b-c][a-z] as device names - so we can only allocate upto 52 ebs volumes on a node.
85 lines
2.0 KiB
Go
85 lines
2.0 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package aws
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import "testing"
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func TestDeviceAllocator(t *testing.T) {
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tests := []struct {
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name string
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existingDevices ExistingDevices
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lastIndex int
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expectedOutput mountDevice
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}{
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{
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"empty device list",
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ExistingDevices{},
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0,
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"bb",
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},
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{
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"empty device list with wrap",
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ExistingDevices{},
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51,
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"ba", // next to 'zz' is the first one, 'ba'
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},
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{
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"device list",
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ExistingDevices{"ba": "used", "bb": "used", "bc": "used"},
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0,
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"bd",
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},
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{
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"device list with wrap",
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ExistingDevices{"cy": "used", "cz": "used", "ba": "used"},
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49,
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"bb", // "cy", "cz" and "ba" are used
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},
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}
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for _, test := range tests {
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allocator := NewDeviceAllocator(test.lastIndex).(*deviceAllocator)
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got, err := allocator.GetNext(test.existingDevices)
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if err != nil {
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t.Errorf("text %q: unexpected error: %v", test.name, err)
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}
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if got != test.expectedOutput {
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t.Errorf("text %q: expected %q, got %q", test.name, test.expectedOutput, got)
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}
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}
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}
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func TestDeviceAllocatorError(t *testing.T) {
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allocator := NewDeviceAllocator(0).(*deviceAllocator)
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existingDevices := ExistingDevices{}
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// make all devices used
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var first, second byte
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for first = 'b'; first <= 'c'; first++ {
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for second = 'a'; second <= 'z'; second++ {
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device := [2]byte{first, second}
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existingDevices[mountDevice(device[:])] = "used"
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}
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}
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device, err := allocator.GetNext(existingDevices)
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if err == nil {
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t.Errorf("expected error, got device %q", device)
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}
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}
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