79 lines
1.5 KiB
Go
79 lines
1.5 KiB
Go
package logstore
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"strings"
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"time"
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)
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type LineFilter func(line string) bool
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func StreamFile(ctx context.Context, path string, w io.Writer, flush func() error, tail int, filter LineFilter) error {
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file, err := os.Open(path)
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if err != nil {
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if os.IsNotExist(err) {
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fmt.Fprintf(w, "event: info\ndata: 日志文件尚未生成\n\n")
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_ = flush()
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return nil
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}
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return err
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}
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defer file.Close()
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if tail > 0 {
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lines, err := tailLines(path, tail)
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if err != nil {
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return err
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}
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for _, line := range lines {
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if strings.TrimSpace(line) == "" {
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continue
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}
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if filter != nil && !filter(line) {
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continue
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}
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fmt.Fprintf(w, "event: log\ndata: %s\n\n", trimSSE(line+"\n"))
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if err := flush(); err != nil {
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return err
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}
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}
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}
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if _, err := file.Seek(0, io.SeekEnd); err != nil {
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return err
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}
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reader := bufio.NewReader(file)
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for {
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if ctx.Err() != nil {
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return ctx.Err()
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}
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line, err := reader.ReadString('\n')
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if err != nil {
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if err == io.EOF {
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time.Sleep(500 * time.Millisecond)
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continue
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}
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return err
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}
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if filter != nil && !filter(strings.TrimRight(line, "\r\n")) {
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continue
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}
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fmt.Fprintf(w, "event: log\ndata: %s\n\n", trimSSE(line))
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if err := flush(); err != nil {
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return err
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}
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}
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}
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func trimSSE(line string) string {
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line = line[:len(line)-1]
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if len(line) > 0 && line[len(line)-1] == '\r' {
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line = line[:len(line)-1]
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}
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return line
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}
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