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* rxgo event source to channel with drop strategy * code optimizations
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,40 +1,53 @@ | ||
| package logging | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
||
| "github.com/reactivex/rxgo/v2" | ||
| "context" | ||
| ) | ||
|
|
||
| /* | ||
| Logger implementation using the observable pattern. | ||
| Implements io.Writer interface. | ||
| Logger implementation using the observable pattern. | ||
| Implements io.Writer interface. | ||
| The observable is an event source which drops everythigng unless there's | ||
| a subscriber connected. | ||
| The observable is an event source which drops everythigng unless there's | ||
| a subscriber connected. | ||
| The observer implementatios are a http ServerSentEvents handler and a | ||
| websocket one in handler.go | ||
| The observer implementatios are a http ServerSentEvents handler and a | ||
| websocket one in handler.go | ||
| */ | ||
|
|
||
| var ( | ||
| logsChan = make(chan rxgo.Item, 100) | ||
| logsObservable = rxgo. | ||
| FromEventSource(logsChan, rxgo.WithBackPressureStrategy(rxgo.Drop)). | ||
| BufferWithTime(rxgo.WithDuration(time.Millisecond * 500)) | ||
| ) | ||
|
|
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| type ObservableLogger struct{} | ||
| type ObservableLogger struct { | ||
| logsChan chan []byte | ||
| } | ||
|
|
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| func NewObservableLogger() *ObservableLogger { | ||
| return &ObservableLogger{} | ||
| return &ObservableLogger{ | ||
| logsChan: make(chan []byte, 100), | ||
| } | ||
| } | ||
|
|
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| func (o *ObservableLogger) Write(p []byte) (n int, err error) { | ||
| logsChan <- rxgo.Of(string(p)) | ||
|
|
||
| n = len(p) | ||
| err = nil | ||
| select { | ||
| case o.logsChan <- p: | ||
| n = len(p) | ||
| err = nil | ||
| return | ||
| default: | ||
| return | ||
| } | ||
| } | ||
|
|
||
| return | ||
| func (o *ObservableLogger) Observe(ctx context.Context) <-chan string { | ||
| logs := make(chan string) | ||
|
|
||
| go func() { | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case logLine := <-o.logsChan: | ||
| logs <- string(logLine) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return logs | ||
| } |
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