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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| package workload | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| "github.com/projecteru2/agent/types" | ||
| coreutils "github.com/projecteru2/core/utils" | ||
|
|
||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| type subscriber struct { | ||
| buf *bufio.ReadWriter | ||
| unsubscribe func() | ||
| } | ||
|
|
||
| // logBroadcaster receives log and broadcasts to subscribers | ||
| type logBroadcaster struct { | ||
| logC chan *types.Log | ||
| subscribers map[string]map[string]*subscriber | ||
| } | ||
|
|
||
| func newLogBroadcaster() *logBroadcaster { | ||
| return &logBroadcaster{ | ||
| logC: make(chan *types.Log), | ||
| subscribers: map[string]map[string]*subscriber{}, | ||
| } | ||
| } | ||
|
|
||
| // subscribe subscribes logs of the specific app. | ||
| func (l *logBroadcaster) subscribe(app string, buf *bufio.ReadWriter) { | ||
| if _, ok := l.subscribers[app]; !ok { | ||
| l.subscribers[app] = map[string]*subscriber{} | ||
| } | ||
|
|
||
| ID := coreutils.RandomString(8) | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
|
|
||
| l.subscribers[app][ID] = &subscriber{buf, cancel} | ||
| logrus.Infof("%s %s log subscribed", app, ID) | ||
| <-ctx.Done() | ||
|
|
||
| delete(l.subscribers[app], ID) | ||
| if len(l.subscribers[app]) == 0 { | ||
| delete(l.subscribers, app) | ||
| } | ||
| } | ||
|
|
||
| func (l *logBroadcaster) broadcast(log *types.Log) { | ||
| if _, ok := l.subscribers[log.Name]; !ok { | ||
| return | ||
| } | ||
| data, err := json.Marshal(log) | ||
| if err != nil { | ||
| logrus.Error(err) | ||
| return | ||
| } | ||
| line := fmt.Sprintf("%X\r\n%s\r\n\r\n", len(data)+2, string(data)) | ||
| for ID, subscriber := range l.subscribers[log.Name] { | ||
| if _, err := subscriber.buf.WriteString(line); err != nil { | ||
| logrus.Error(err) | ||
| logrus.Infof("%s %s detached", log.Name, ID) | ||
| subscriber.unsubscribe() | ||
| } | ||
| subscriber.buf.Flush() | ||
| logrus.Debugf("sub %s get %s", ID, line) | ||
| } | ||
| } | ||
|
|
||
| func (l *logBroadcaster) run(ctx context.Context) { | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| logrus.Infof("[logBroadcaster] stops") | ||
| return | ||
| case log := <-l.logC: | ||
| l.broadcast(log) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (l *logBroadcaster) handler(w http.ResponseWriter, req *http.Request) { | ||
| app := req.URL.Query().Get("app") | ||
| if app == "" { | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| return | ||
| } | ||
| // fuck httpie | ||
| w.WriteHeader(http.StatusOK) | ||
| if hijack, ok := w.(http.Hijacker); ok { | ||
| conn, buf, err := hijack.Hijack() | ||
| if err != nil { | ||
| logrus.Errorf("[apiLog] connect failed %v", err) | ||
| return | ||
| } | ||
| defer conn.Close() | ||
| l.subscribe(app, buf) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| package workload | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "context" | ||
| "net/http" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/projecteru2/agent/types" | ||
|
|
||
| "github.com/bmizerany/pat" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestLogBroadcaster(t *testing.T) { | ||
| l := newLogBroadcaster() | ||
|
|
||
| go func() { | ||
| restfulAPIServer := pat.New() | ||
| restfulAPIServer.Add("GET", "/log/", http.HandlerFunc(l.handler)) | ||
| http.Handle("/", restfulAPIServer) | ||
| http.ListenAndServe(":12310", nil) | ||
| }() | ||
|
|
||
| go func() { | ||
| time.Sleep(3 * time.Second) | ||
| l.logC <- &types.Log{ | ||
| ID: "Rei", | ||
| Name: "nerv", | ||
| Type: "stdout", | ||
| EntryPoint: "eva0", | ||
| Ident: "", | ||
| Data: "data0", | ||
| } | ||
| l.logC <- &types.Log{ | ||
| ID: "Rei", | ||
| Name: "nerv", | ||
| Type: "stdout", | ||
| EntryPoint: "eva0", | ||
| Ident: "", | ||
| Data: "data1", | ||
| } | ||
| }() | ||
|
|
||
| ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second) | ||
| defer cancel() | ||
| go l.run(ctx) | ||
|
|
||
| time.Sleep(2 * time.Second) | ||
| resp, err := http.Get("http://127.0.0.1:12310/log/?app=nerv") | ||
| assert.Nil(t, err) | ||
|
|
||
| reader := bufio.NewReader(resp.Body) | ||
| for i := 0; i < 2; i++ { | ||
| line, err := reader.ReadBytes('\n') | ||
| assert.Nil(t, err) | ||
| t.Log(string(line)) | ||
| } | ||
| } |
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