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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package lokilogger | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
| "time" | ||
| ) | ||
|
|
||
| type LokiConfig struct { | ||
| PushIntervalSeconds int64 | ||
| MaxBatchSize int | ||
| LokiEndpoint string | ||
| ServiceName string | ||
| } | ||
|
|
||
| type lokiStream struct { | ||
| Stream map[string]string `json:"stream"` | ||
| Values [][]string `json:"values"` | ||
| } | ||
|
|
||
| type lokiLogEvent struct { | ||
| Streams []lokiStream `json:"streams"` | ||
| } | ||
|
|
||
| type LokiClient struct { | ||
| config *LokiConfig | ||
| logs [][]string | ||
| done chan bool | ||
| } | ||
|
|
||
| func (l *LokiClient) bgRun() { | ||
| for { | ||
| l.sendLogsToLoki() | ||
|
|
||
| select { | ||
| case <-l.done: | ||
| return | ||
| default: | ||
| time.Sleep(time.Second * time.Duration(l.config.PushIntervalSeconds)) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (l *LokiClient) sendLogsToLoki() { | ||
| if len(l.logs) == 0 { | ||
| return | ||
| } | ||
|
|
||
| var logsToSend [][]string | ||
| if len(l.logs) > l.config.MaxBatchSize { | ||
| logsToSend = l.logs[:l.config.MaxBatchSize] | ||
| l.logs = l.logs[l.config.MaxBatchSize:] | ||
| } else { | ||
| logsToSend = l.logs | ||
| l.logs = [][]string{} | ||
| } | ||
|
|
||
| data, err := json.Marshal(lokiLogEvent{ | ||
| Streams: []lokiStream{ | ||
| { | ||
| Stream: map[string]string{ | ||
| "service": l.config.ServiceName, | ||
| }, | ||
| Values: logsToSend, | ||
| }, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| fmt.Printf("Error marshalling logs: %v\n", err) | ||
| return | ||
| } | ||
|
|
||
| req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/loki/api/v1/push", l.config.LokiEndpoint), bytes.NewBuffer(data)) | ||
| if err != nil { | ||
| fmt.Printf("Error creating request: %v\n", err) | ||
| return | ||
| } | ||
|
|
||
| req.Header.Set("Content-Type", "application/json") | ||
|
|
||
| client := &http.Client{} | ||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| fmt.Printf("Error sending logs: %v\n", err) | ||
| return | ||
| } | ||
| defer resp.Body.Close() | ||
| } | ||
|
|
||
| func (l *LokiClient) Write(p []byte) (n int, err error) { | ||
| l.logs = append(l.logs, []string{ | ||
| fmt.Sprintf("%d", time.Now().UnixNano()), | ||
| string(p), | ||
| }) | ||
|
|
||
| return len(p), nil | ||
| } | ||
|
|
||
| func NewLokiClient(config *LokiConfig) *LokiClient { | ||
| client := &LokiClient{ | ||
| config: config, | ||
| logs: [][]string{}, | ||
| done: make(chan bool), | ||
| } | ||
| go client.bgRun() | ||
| return client | ||
| } |
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