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55 changes: 55 additions & 0 deletions
55
launcher/internal/healthmonitoring/nodeproblemdetector/systemstats_config.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| // Package nodeproblemdetector provides configurations for node-problem-detector.service. | ||
| package nodeproblemdetector | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "os" | ||
| "time" | ||
| ) | ||
|
|
||
| var defaultInvokeIntervalString = (60 * time.Second).String() | ||
|
|
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| type metricConfig struct { | ||
| DisplayName string `json:"displayName"` | ||
| } | ||
|
|
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| type memoryStatsConfig struct { | ||
| MetricsConfigs map[string]metricConfig `json:"metricsConfigs"` | ||
| } | ||
|
|
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| // SystemStatsConfig contains configurations for `System Stats Monitor`, | ||
| // a problem daemon in node-problem-detector that collects pre-defined health-related metrics from different system components. | ||
| // For now we only consider collecting memory related metrics. | ||
| // View the comprehensive configuration details on https://github.com/kubernetes/node-problem-detector/tree/master/pkg/systemstatsmonitor#detailed-configuration-options | ||
| type SystemStatsConfig struct { | ||
| MemoryStatsConfig memoryStatsConfig `json:"memory"` | ||
| InvokeInterval string `json:"invokeInterval"` | ||
| } | ||
|
|
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| // NewSystemStatsConfig returns a new SystemStatsConfig struct with default configurations. | ||
| func NewSystemStatsConfig() SystemStatsConfig { | ||
| return SystemStatsConfig{ | ||
| MemoryStatsConfig: memoryStatsConfig{MetricsConfigs: map[string]metricConfig{}}, | ||
| InvokeInterval: defaultInvokeIntervalString, | ||
| } | ||
| } | ||
|
|
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| // EnableMemoryBytesUsed enables "memory/bytes_used" for memory monitoring. | ||
| func (ssc *SystemStatsConfig) EnableMemoryBytesUsed() { | ||
| ssc.MemoryStatsConfig.MetricsConfigs["memory/bytes_used"] = metricConfig{DisplayName: "memory/bytes_used"} | ||
| } | ||
|
|
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| // WithInvokeInterval overrides the default invokeInterval. | ||
| func (ssc *SystemStatsConfig) WithInvokeInterval(interval time.Duration) { | ||
| ssc.InvokeInterval = interval.String() | ||
| } | ||
|
|
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| // WriteFile writes systemStatsConfig data to the named file, creating it if necessary. | ||
| func (ssc *SystemStatsConfig) WriteFile(path string) error { | ||
| bytes, err := json.Marshal(ssc) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to marshal struct [%v]: %w", ssc, err) | ||
| } | ||
| return os.WriteFile(path, bytes, 0644) | ||
| } |
65 changes: 65 additions & 0 deletions
65
launcher/internal/healthmonitoring/nodeproblemdetector/systemstats_config_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| package nodeproblemdetector | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "io" | ||
| "os" | ||
| "path" | ||
| "testing" | ||
| "time" | ||
|
|
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| "github.com/google/go-cmp/cmp" | ||
| ) | ||
|
|
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| func TestEnableMemoryBytesUsed(t *testing.T) { | ||
| got := NewSystemStatsConfig() | ||
| got.EnableMemoryBytesUsed() | ||
|
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| want := SystemStatsConfig{ | ||
| MemoryStatsConfig: memoryStatsConfig{ | ||
| MetricsConfigs: map[string]metricConfig{ | ||
| "memory/bytes_used": {DisplayName: "memory/bytes_used"}, | ||
| }, | ||
| }, | ||
| InvokeInterval: defaultInvokeIntervalString, | ||
| } | ||
| if !cmp.Equal(got, want) { | ||
| t.Errorf("EnableMemoryBytesUsed() failed, got: %v, want: %v", got, want) | ||
| } | ||
| } | ||
|
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| func TestWithInvokeInterval(t *testing.T) { | ||
| got := SystemStatsConfig{} | ||
| got.WithInvokeInterval(2 * time.Second) | ||
|
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| want := SystemStatsConfig{InvokeInterval: (2 * time.Second).String()} | ||
| if !cmp.Equal(got, want) { | ||
| t.Errorf("WithInvokeInterval() failed, got: %v, want: %v", got, want) | ||
| } | ||
| } | ||
|
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| func TestWriteFile(t *testing.T) { | ||
| tmpDir := t.TempDir() | ||
| tmpConfigFile := path.Join(tmpDir, "system-stats-monitor.json") | ||
|
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| config := NewSystemStatsConfig() | ||
| config.EnableMemoryBytesUsed() | ||
| if err := config.WriteFile(tmpConfigFile); err != nil { | ||
| t.Fatalf("WriteFile() failed: %v", err) | ||
| } | ||
|
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| file, err := os.OpenFile(tmpConfigFile, os.O_RDONLY, 0) | ||
| if err != nil { | ||
| t.Fatalf("failed to open file %s: %v", tmpConfigFile, err) | ||
| } | ||
|
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| gotBytes, err := io.ReadAll(file) | ||
| if err != nil { | ||
| t.Fatalf("failed to read from file %s: %v", tmpConfigFile, err) | ||
| } | ||
|
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| wantBytes := []byte(`{"memory":{"metricsConfigs":{"memory/bytes_used":{"displayName":"memory/bytes_used"}}},"invokeInterval":"1m0s"}`) | ||
| if !bytes.Equal(gotBytes, wantBytes) { | ||
| t.Errorf("WriteFile() did not write expected contents, got %s, want %s", gotBytes, wantBytes) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // Package systemctl implements a subset of systemctl operations. | ||
| package systemctl | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
|
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| "github.com/coreos/go-systemd/dbus" | ||
| ) | ||
|
|
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| // Systemd is an interface to connect to host systemd with selected functions. | ||
| type Systemd interface { | ||
| Start(string) error | ||
| Stop(string) error | ||
| Close() | ||
| } | ||
|
|
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| // Systemctl is a wrap around of dbus.Conn and implements the Systemd interface. | ||
| type Systemctl struct { | ||
| dbus *dbus.Conn | ||
| } | ||
|
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| var _ Systemd = (*Systemctl)(nil) | ||
|
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| // New connects to systemd over dbus. | ||
| func New() (*Systemctl, error) { | ||
| conn, err := dbus.New() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &Systemctl{dbus: conn}, nil | ||
| } | ||
|
|
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| // Start is the equivalent of `systemctl start $unit`. | ||
| func (s *Systemctl) Start(unit string) error { | ||
| return runSystemdCmd(s.dbus.StartUnit, "start", unit) | ||
| } | ||
|
|
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| // Stop is the equivalent of `systemctl stop $unit`. | ||
| func (s *Systemctl) Stop(unit string) error { | ||
| return runSystemdCmd(s.dbus.StopUnit, "stop", unit) | ||
| } | ||
|
|
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| // Close disconnects from dbus. | ||
| func (s *Systemctl) Close() { s.dbus.Close() } | ||
|
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| func runSystemdCmd(cmdFunc func(string, string, chan<- string) (int, error), cmd string, unit string) error { | ||
| progress := make(chan string, 1) | ||
|
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| // Run systemd command in "replace" mode to start the unit and its dependencies, | ||
| // possibly replacing already queued jobs that conflict w∏ith this. | ||
| if _, err := cmdFunc(unit, "replace", progress); err != nil { | ||
| return fmt.Errorf("failed to run systemctl [%s] for unit [%s]: %v", cmd, unit, err) | ||
| } | ||
|
|
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| if result := <-progress; result != "done" { | ||
| return fmt.Errorf("systemctl [%s] result was [%s], want done", cmd, result) | ||
| } | ||
|
|
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| log.Printf("Finished up systemctl [%s] for unit [%s]", cmd, unit) | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| package systemctl | ||
|
|
||
| import ( | ||
| "errors" | ||
| "testing" | ||
| ) | ||
|
|
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| func TestRunSystmedCmd(t *testing.T) { | ||
| doneUnitFunc := func(unit string, mode string, progress chan<- string) (int, error) { | ||
| progress <- "done" | ||
| return 1, nil | ||
| } | ||
| failedCallUnitFunc := func(unit string, mode string, progress chan<- string) (int, error) { | ||
| return 1, errors.New("something went wrong") | ||
| } | ||
| failedUnitFunc := func(unit string, mode string, progress chan<- string) (int, error) { | ||
| progress <- "failed" | ||
| return 1, nil | ||
| } | ||
|
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| testCases := []struct { | ||
| name string | ||
| sytemdCmdFunc func(unit string, flag string, progress chan<- string) (int, error) | ||
| wantErr bool | ||
| }{ | ||
| { | ||
| name: "success", | ||
| sytemdCmdFunc: doneUnitFunc, | ||
| wantErr: false, | ||
| }, | ||
| { | ||
| name: "failed call", | ||
| sytemdCmdFunc: failedCallUnitFunc, | ||
| wantErr: true, | ||
| }, | ||
| { | ||
| name: "failed unit run", | ||
| sytemdCmdFunc: failedUnitFunc, | ||
| wantErr: true, | ||
| }, | ||
| } | ||
|
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| for _, tc := range testCases { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| if err := runSystemdCmd(tc.sytemdCmdFunc, "test", "test_unit"); (err != nil) != tc.wantErr { | ||
| t.Errorf("runSystemdCmd() did not return expected error, got error: %v, but wantErr %v", err, tc.wantErr) | ||
| } | ||
| }) | ||
| } | ||
| } |
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