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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| // Package buf provides a small file buffer that can be flushed to disk. | ||
| // Used by willow package. | ||
| package buf | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "os" | ||
| "path/filepath" | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| FileMode = 0o644 | ||
| DirMode = 0o755 | ||
| ) | ||
|
|
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| // FileBuffer holds a file before it gets flushed to disk. | ||
| type FileBuffer struct { | ||
| Logger | ||
| FirstWrite time.Time | ||
| writes uint | ||
| mu sync.Mutex | ||
| buf *bytes.Buffer | ||
| Path string | ||
| } | ||
|
|
||
| // Logger lets this sub module print messages. | ||
| type Logger interface { | ||
| Errorf(msg string, v ...interface{}) | ||
| Printf(msg string, v ...interface{}) | ||
| Debugf(msg string, v ...interface{}) | ||
| } | ||
|
|
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| // NewBuffer returns a new FileBuffer read to use. | ||
| func NewBuffer(path string, data []byte, logger Logger) *FileBuffer { | ||
| if logger == nil { | ||
| panic("NewBuffer() cannot take a nil logger") | ||
| } | ||
|
|
||
| return &FileBuffer{ | ||
| Logger: logger, | ||
| FirstWrite: time.Now(), | ||
| writes: 1, | ||
| buf: bytes.NewBuffer(data), | ||
| Path: path, | ||
| } | ||
| } | ||
|
|
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| // Write sends content to the file buffer and increments the write counter. | ||
| func (f *FileBuffer) Write(p []byte) (int, error) { | ||
| f.mu.Lock() | ||
| defer f.mu.Unlock() | ||
| f.writes++ | ||
|
|
||
| return f.buf.Write(p) | ||
| } | ||
|
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| func (f *FileBuffer) Len() int { | ||
| return f.buf.Len() | ||
| } | ||
|
|
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| // Flush writes the file buffer to disk. | ||
| func (f *FileBuffer) Flush() { | ||
| f.mu.Lock() | ||
| defer f.mu.Unlock() | ||
|
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| if err := os.MkdirAll(filepath.Dir(f.Path), DirMode); err != nil { | ||
| // We could return here, but let's try to write the file anyway? | ||
| f.Errorf("Creating dir for %s: %v", f.Path, err) | ||
| } | ||
|
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| file, err := os.OpenFile(f.Path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, FileMode) | ||
| if err != nil { | ||
| f.Errorf("Opening or creating file %s: %v", f.Path, err) | ||
| return | ||
| } | ||
| defer file.Close() | ||
|
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| size, err := file.Write(f.buf.Bytes()) | ||
| if err != nil { | ||
| // Since all we do is print an info message, we do not need to return here. | ||
| // Consider that if you add more logic after this stanza. | ||
| f.Errorf("Writing file '%s' content: %v", f.Path, err) | ||
| } | ||
|
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| f.Printf("Wrote %d bytes (%d lines) to '%s'", size, f.writes, f.Path) | ||
| } |
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