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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| package exec | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "bytes" | ||
| "container/ring" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "runtime" | ||
| "sync" | ||
|
|
||
| "github.com/TBD54566975/ftl/backend/common/log" | ||
| ) | ||
|
|
||
| type CircularBuffer struct { | ||
| r *ring.Ring | ||
| size int | ||
| mu sync.Mutex | ||
| cap int | ||
| } | ||
|
|
||
| func NewCircularBuffer(capacity int) *CircularBuffer { | ||
| return &CircularBuffer{ | ||
| r: ring.New(capacity), | ||
| cap: capacity, | ||
| } | ||
| } | ||
|
|
||
| // Write accepts a string and stores it in the buffer. | ||
| // It expects entire lines and stores each line as a separate entry in the ring buffer. | ||
| func (cb *CircularBuffer) Write(p string) error { | ||
| cb.mu.Lock() | ||
| defer cb.mu.Unlock() | ||
|
|
||
| cb.r.Value = p | ||
| cb.r = cb.r.Next() | ||
|
|
||
| if cb.size < cb.cap { | ||
| cb.size++ | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (cb *CircularBuffer) Bytes() []byte { | ||
| cb.mu.Lock() | ||
| defer cb.mu.Unlock() | ||
|
|
||
| if cb.size == 0 { | ||
| fmt.Println("Buffer is empty.") | ||
| return []byte{} | ||
| } | ||
|
|
||
| var buf bytes.Buffer | ||
| start := cb.r.Move(-cb.size) // Correctly calculate the starting position | ||
|
|
||
| for i := 0; i < cb.size; i++ { | ||
| if str, ok := start.Value.(string); ok { | ||
| buf.WriteString(str) | ||
| } else { | ||
| fmt.Println("Unexpected type or nil found in buffer") | ||
| } | ||
| start = start.Next() | ||
| } | ||
|
|
||
| return buf.Bytes() | ||
| } | ||
|
|
||
| func (cb *CircularBuffer) WriterAt(ctx context.Context, level log.Level) *io.PipeWriter { | ||
| // Copied from logger.go which is based on logrus | ||
| // Based on MIT licensed Logrus https://github.com/sirupsen/logrus/blob/bdc0db8ead3853c56b7cd1ac2ba4e11b47d7da6b/writer.go#L27 | ||
| logger := log.FromContext(ctx) | ||
| reader, writer := io.Pipe() | ||
| var printFunc func(format string, args ...interface{}) | ||
|
|
||
| switch level { | ||
| case log.Trace: | ||
| printFunc = logger.Tracef | ||
| case log.Debug: | ||
| printFunc = logger.Debugf | ||
| case log.Info: | ||
| printFunc = logger.Infof | ||
| case log.Warn: | ||
| printFunc = logger.Warnf | ||
| case log.Error: | ||
| printFunc = func(format string, args ...interface{}) { | ||
| logger.Errorf(nil, format, args...) | ||
| } | ||
| default: | ||
| panic(level) | ||
| } | ||
|
|
||
| go cb.writerScanner(reader, printFunc) | ||
| runtime.SetFinalizer(writer, writerFinalizer) | ||
|
|
||
| return writer | ||
| } | ||
|
|
||
| func (cb *CircularBuffer) writerScanner(reader *io.PipeReader, printFunc func(format string, args ...interface{})) { | ||
| scanner := bufio.NewScanner(reader) | ||
| for scanner.Scan() { | ||
| text := scanner.Text() | ||
| printFunc(text) | ||
| err := cb.Write(text + "\n") | ||
| if err != nil { | ||
| fmt.Println("Error writing to buffer") | ||
| } | ||
| } | ||
| if err := scanner.Err(); err != nil { | ||
| fmt.Println("Error reading from pipe:", err) | ||
| } | ||
| reader.Close() | ||
| } | ||
|
|
||
| func writerFinalizer(writer *io.PipeWriter) { | ||
| writer.Close() | ||
| } |
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