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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "bytes" | ||
| "chat/globals" | ||
| "crypto/tls" | ||
| "fmt" | ||
| "net/http" | ||
| ) | ||
|
|
||
| func SSEClient(method string, uri string, headers map[string]string, body interface{}, callback func(string) error) error { | ||
| http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true} | ||
|
|
||
| client := &http.Client{} | ||
| req, err := http.NewRequest(method, uri, ConvertBody(body)) | ||
| if err != nil { | ||
| return nil | ||
| } | ||
| for key, value := range headers { | ||
| req.Header.Set(key, value) | ||
| } | ||
|
|
||
| res, err := client.Do(req) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if res.StatusCode >= 400 { | ||
| return fmt.Errorf("request failed with status: %s", res.Status) | ||
| } | ||
|
|
||
| defer res.Body.Close() | ||
|
|
||
| events, err := CreateSSEInstance(res) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| select { | ||
| case ev := <-events: | ||
| if err := callback(ev.Data); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Event represents a Server-Sent Event | ||
| type Event struct { | ||
| Name string | ||
| ID string | ||
| Data string | ||
| } | ||
|
|
||
| func CreateSSEInstance(resp *http.Response) (chan Event, error) { | ||
| events := make(chan Event) | ||
| reader := bufio.NewReader(resp.Body) | ||
|
|
||
| go loop(reader, events) | ||
|
|
||
| return events, nil | ||
| } | ||
|
|
||
| func loop(reader *bufio.Reader, events chan Event) { | ||
| ev := Event{} | ||
|
|
||
| var buf bytes.Buffer | ||
|
|
||
| for { | ||
| line, err := reader.ReadBytes('\n') | ||
| if err != nil { | ||
| globals.Info(fmt.Sprintf("[sse] error during read response body: %s", err)) | ||
| close(events) | ||
| } | ||
|
|
||
| switch { | ||
| case ioPrefix(line, ":"): | ||
| // Comment, do nothing | ||
| case ioPrefix(line, "retry:"): | ||
| // Retry, do nothing for now | ||
|
|
||
| // id of event | ||
| case ioPrefix(line, "id: "): | ||
| ev.ID = string(line[4:]) | ||
| case ioPrefix(line, "id:"): | ||
| ev.ID = string(line[3:]) | ||
|
|
||
| // name of event | ||
| case ioPrefix(line, "event: "): | ||
| ev.Name = string(line[7 : len(line)-1]) | ||
| case ioPrefix(line, "event:"): | ||
| ev.Name = string(line[6 : len(line)-1]) | ||
|
|
||
| // event data | ||
| case ioPrefix(line, "data: "): | ||
| buf.Write(line[6:]) | ||
| case ioPrefix(line, "data:"): | ||
| buf.Write(line[5:]) | ||
|
|
||
| // end of event | ||
| case bytes.Equal(line, []byte("\n")): | ||
| b := buf.Bytes() | ||
|
|
||
| if ioPrefix(b, "{") { | ||
| if err == nil { | ||
| ev.Data = string(b) | ||
| buf.Reset() | ||
| events <- ev | ||
| ev = Event{} | ||
| } | ||
| } | ||
|
|
||
| default: | ||
| globals.Info(fmt.Sprintf("[sse] unknown line: %s", line)) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func ioPrefix(s []byte, prefix string) bool { | ||
| return bytes.HasPrefix(s, []byte(prefix)) | ||
| } |