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feat(health): implement health endpoint (wip)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| package endpoints | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| "net/http" | ||
|
|
||
| "github.com/massix/chaos-monkey/internal/configuration" | ||
| "github.com/massix/chaos-monkey/internal/watcher" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
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| type HealthEndpoint struct { | ||
| mainWatcher *watcher.NamespaceWatcher | ||
| logrus logrus.FieldLogger | ||
| } | ||
|
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| type response struct { | ||
| Status string `json:"status"` | ||
| RootNamespace string `json:"root_namespace"` | ||
| Behavior configuration.Behavior `json:"behavior"` | ||
| Loglevel string `json:"loglevel"` | ||
| TotalWatchers int `json:"total_watchers"` | ||
| } | ||
|
|
||
| type stack[T any] struct { | ||
| elems []T | ||
| } | ||
|
|
||
| func (s *stack[T]) push(elem T) { | ||
| s.elems = append(s.elems, elem) | ||
| } | ||
|
|
||
| func (s *stack[T]) pop() (T, error) { | ||
| if s.isEmpty() { | ||
| return *new(T), errors.New("Empty stack") | ||
| } | ||
| ret := s.elems[0] | ||
| s.elems = s.elems[1:] | ||
| return ret, nil | ||
| } | ||
|
|
||
| func (s *stack[T]) isEmpty() bool { | ||
| return len(s.elems) == 0 | ||
| } | ||
|
|
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| func NewHealthEndpoint(w *watcher.NamespaceWatcher) *HealthEndpoint { | ||
| return &HealthEndpoint{ | ||
| mainWatcher: w, | ||
| logrus: logrus.WithFields(logrus.Fields{"component": "HealthEndpoint"}), | ||
| } | ||
| } | ||
|
|
||
| func (e *HealthEndpoint) CountWatchers() int { | ||
| stack := &stack[watcher.Watcher]{} | ||
| count := 0 | ||
| stack.push(e.mainWatcher) | ||
| e.logrus.Debug("Counting watchers") | ||
|
|
||
| for !stack.isEmpty() { | ||
| current, err := stack.pop() | ||
| if err != nil { | ||
| e.logrus.Warn(err) | ||
| continue | ||
| } | ||
|
|
||
| switch w := current.(type) { | ||
| case (*watcher.NamespaceWatcher): | ||
| if w == nil { | ||
| e.logrus.Warn("Nil pointer in loop") | ||
| continue | ||
| } | ||
| e.logrus.Debugf("Found NamespaceWatcher with %d children", len(w.CrdWatchers)) | ||
| for _, child := range w.CrdWatchers { | ||
| stack.push(child) | ||
| } | ||
| case (*watcher.CrdWatcher): | ||
| if w == nil { | ||
| e.logrus.Warn("Nil pointer in loop") | ||
| continue | ||
| } | ||
| e.logrus.Debugf("Found CrdWatcher with %d children", len(w.DeploymentWatchers)) | ||
| for _, child := range w.DeploymentWatchers { | ||
| stack.push(child.Watcher) | ||
| } | ||
| default: | ||
| if w == nil { | ||
| e.logrus.Warn("Nil pointer in loop") | ||
| continue | ||
| } | ||
| e.logrus.Debug("Pod or DeploymentWatcher found") | ||
| } | ||
|
|
||
| count++ | ||
| } | ||
|
|
||
| e.logrus.Debugf("Total count: %d", count) | ||
| return count | ||
| } | ||
|
|
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| // ServeHTTP implements http.Handler. | ||
| func (e *HealthEndpoint) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| e.logrus.Debugf( | ||
| "Handling request '%s %s' from %s", | ||
| r.Method, | ||
| r.URL.Path, | ||
| r.RemoteAddr, | ||
| ) | ||
|
|
||
| if e.mainWatcher == nil { | ||
| e.logrus.Error("Nil pointer in main watcher") | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| w.Write([]byte{}) | ||
| return | ||
| } | ||
|
|
||
| response := &response{ | ||
| Status: "up", | ||
| TotalWatchers: e.CountWatchers(), | ||
| RootNamespace: e.mainWatcher.RootNamespace, | ||
| Behavior: e.mainWatcher.Behavior, | ||
| Loglevel: logrus.GetLevel().String(), | ||
| } | ||
|
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| if b, err := json.Marshal(response); err == nil { | ||
| w.WriteHeader(http.StatusOK) | ||
| if _, err := w.Write(b); err != nil { | ||
| e.logrus.Errorf("Could not write response: %s", err) | ||
| } | ||
| } else { | ||
| e.logrus.Errorf("Could not marshal response: %s", err) | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| if _, err := w.Write([]byte{}); err != nil { | ||
| e.logrus.Errorf("Could not write response: %s", err) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| var _ = (http.Handler)((*HealthEndpoint)(nil)) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| package endpoints | ||
|
|
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| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "math/rand" | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "strings" | ||
| "testing" | ||
|
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| "github.com/massix/chaos-monkey/internal/configuration" | ||
| "github.com/massix/chaos-monkey/internal/watcher" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
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| func setup(crdWatchers, deployWatchers int) (*watcher.NamespaceWatcher, int) { | ||
| mainWatcher := &watcher.NamespaceWatcher{ | ||
| CrdWatchers: map[string]watcher.Watcher{}, | ||
| RootNamespace: "root", | ||
| Behavior: configuration.DenyAll, | ||
| } | ||
| created := 1 | ||
|
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| for i := 0; i < crdWatchers; i++ { | ||
| crdWatcher := &watcher.CrdWatcher{DeploymentWatchers: map[string]*watcher.WatcherConfiguration{}} | ||
| mainWatcher.CrdWatchers[fmt.Sprintf("%d", i)] = crdWatcher | ||
| created++ | ||
|
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| for j := 0; j < deployWatchers; j++ { | ||
| var target watcher.ConfigurableWatcher | ||
| if rand.Intn(2) == 0 { | ||
| target = &watcher.PodWatcher{} | ||
| } else { | ||
| target = &watcher.DeploymentWatcher{} | ||
| } | ||
| crdWatcher.DeploymentWatchers[fmt.Sprintf("%d", j)] = &watcher.WatcherConfiguration{ | ||
| Watcher: target, | ||
| } | ||
| created++ | ||
| } | ||
| } | ||
|
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| return mainWatcher, created | ||
| } | ||
|
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| func TestHealthEndpoint_CountWatchers(t *testing.T) { | ||
| logrus.SetLevel(logrus.DebugLevel) | ||
| t.Run("Nominal case", func(t *testing.T) { | ||
| mw, created := setup(10, 15) | ||
| ep := NewHealthEndpoint(mw) | ||
| if cnt := ep.CountWatchers(); cnt != (10*15)+10+1 { | ||
| t.Fatalf("wrong count: %d (expecting: %d)", cnt, created) | ||
| } | ||
| }) | ||
| t.Run("Nil pointer", func(t *testing.T) { | ||
| ep := NewHealthEndpoint(nil) | ||
| if cnt := ep.CountWatchers(); cnt != 0 { | ||
| t.Fatalf("wrong count: %d (expecting: %d)", cnt, 0) | ||
| } | ||
| }) | ||
| } | ||
|
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| func TestHealthEndpoint_ServeHTTP(t *testing.T) { | ||
| newTest := func() (*httptest.ResponseRecorder, *http.Request) { | ||
| rec := httptest.NewRecorder() | ||
| req := httptest.NewRequest("GET", "/health", strings.NewReader("")) | ||
|
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| return rec, req | ||
| } | ||
|
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| t.Run("Nominal case", func(t *testing.T) { | ||
| rec, req := newTest() | ||
| w, tot := setup(10, 20) | ||
| ep := NewHealthEndpoint(w) | ||
| ep.ServeHTTP(rec, req) | ||
|
|
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| if rec.Code != http.StatusOK { | ||
| t.Fatalf("Wrong status code: %d", rec.Code) | ||
| } | ||
|
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| var response response | ||
| bResponse, err := io.ReadAll(rec.Result().Body) | ||
| defer rec.Result().Body.Close() | ||
|
|
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| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
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| if err := json.Unmarshal(bResponse, &response); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
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| if response.TotalWatchers != tot { | ||
| t.Errorf("Wrong count of watchers %d", response.TotalWatchers) | ||
| } | ||
|
|
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| if response.RootNamespace != "root" { | ||
| t.Errorf("Wrong namespace %q", response.RootNamespace) | ||
| } | ||
|
|
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| if response.Behavior != configuration.DenyAll { | ||
| t.Errorf("Wrong behavior %q", response.Behavior) | ||
| } | ||
| }) | ||
|
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| t.Run("Nil pointer", func(t *testing.T) { | ||
| rec, req := newTest() | ||
| ep := NewHealthEndpoint(nil) | ||
| ep.ServeHTTP(rec, req) | ||
|
|
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| if rec.Code != http.StatusInternalServerError { | ||
| t.Fatalf("Wrong status code: %d", rec.Code) | ||
| } | ||
| }) | ||
| } | ||
|
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| func BenchmarkHealthEndpoint_CountWatchers(b *testing.B) { | ||
| logrus.SetLevel(logrus.InfoLevel) | ||
| mw, _ := setup(1000, 500) | ||
| ep := NewHealthEndpoint(mw) | ||
|
|
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| for i := 0; i < b.N; i++ { | ||
| ep.CountWatchers() | ||
| } | ||
| } |
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