// newClusterResourceOverride returns an admission controller for containers that
// configurably overrides container resource request/limits
func newClusterResourceOverride(client clientset.Interface, config io.Reader) (admission.Interface, error) {
parsed, err := ReadConfig(config)
if err != nil {
glog.V(5).Infof("%s admission controller loaded with error: (%T) %[2]v", api.PluginName, err)
return nil, err
}
if errs := validation.Validate(parsed); len(errs) > 0 {
return nil, errs.ToAggregate()
}
glog.V(5).Infof("%s admission controller loaded with config: %v", api.PluginName, parsed)
var internal *internalConfig
if parsed != nil {
internal = &internalConfig{
limitCPUToMemoryRatio: inf.NewDec(parsed.LimitCPUToMemoryPercent, 2),
cpuRequestToLimitRatio: inf.NewDec(parsed.CPURequestToLimitPercent, 2),
memoryRequestToLimitRatio: inf.NewDec(parsed.MemoryRequestToLimitPercent, 2),
}
}
limitRanger, err := limitranger.NewLimitRanger(client, wrapLimit)
if err != nil {
return nil, err
}
return &clusterResourceOverridePlugin{
Handler: admission.NewHandler(admission.Create),
config: internal,
LimitRanger: limitRanger,
}, nil
}
func ReadConfig(configFile io.Reader) (*api.ClusterResourceOverrideConfig, error) {
obj, err := configlatest.ReadYAML(configFile)
if err != nil {
glog.V(5).Infof("%s error reading config: %v", api.PluginName, err)
return nil, err
}
if obj == nil {
return nil, nil
}
config, ok := obj.(*api.ClusterResourceOverrideConfig)
if !ok {
return nil, fmt.Errorf("unexpected config object: %#v", obj)
}
glog.V(5).Infof("%s config is: %v", api.PluginName, config)
if errs := validation.Validate(config); len(errs) > 0 {
return nil, errs.ToAggregate()
}
return config, nil
}
func TestConfigReader(t *testing.T) {
initialConfig := testConfig(10, 20, 30)
serializedConfig, serializationErr := configapilatest.WriteYAML(initialConfig)
if serializationErr != nil {
t.Fatalf("WriteYAML: config serialize failed: %v", serializationErr)
}
tests := []struct {
name string
config io.Reader
expectErr bool
expectNil bool
expectInvalid bool
expectedConfig *api.ClusterResourceOverrideConfig
}{
{
name: "process nil config",
config: nil,
expectNil: true,
}, {
name: "deserialize initialConfig yaml",
config: bytes.NewReader(serializedConfig),
expectedConfig: initialConfig,
}, {
name: "completely broken config",
config: bytes.NewReader([]byte("asdfasdfasdF")),
expectErr: true,
}, {
name: "deserialize yamlConfig",
config: bytes.NewReader([]byte(yamlConfig)),
expectedConfig: deserializedYamlConfig,
}, {
name: "choke on out-of-bounds ratio",
config: bytes.NewReader([]byte(invalidConfig)),
expectInvalid: true,
}, {
name: "complain about no settings",
config: bytes.NewReader([]byte(invalidConfig2)),
expectInvalid: true,
},
}
for _, test := range tests {
config, err := ReadConfig(test.config)
if test.expectErr && err == nil {
t.Errorf("%s: expected error", test.name)
} else if !test.expectErr && err != nil {
t.Errorf("%s: expected no error, saw %v", test.name, err)
}
if err == nil {
if test.expectNil && config != nil {
t.Errorf("%s: expected nil config, but saw: %v", test.name, config)
} else if !test.expectNil && config == nil {
t.Errorf("%s: expected config, but got nil", test.name)
}
}
if config != nil {
if test.expectedConfig != nil && *test.expectedConfig != *config {
t.Errorf("%s: expected %v from reader, but got %v", test.name, test.expectErr, config)
}
if err := validation.Validate(config); test.expectInvalid && len(err) == 0 {
t.Errorf("%s: expected validation to fail, but it passed", test.name)
} else if !test.expectInvalid && len(err) > 0 {
t.Errorf("%s: expected validation to pass, but it failed with %v", test.name, err)
}
}
}
}