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|
package handlers
import (
"bytes"
"fmt"
"io"
"sync"
"github.com/mimecast/dtail/internal/io/line"
"github.com/mimecast/dtail/internal/io/pool"
"github.com/mimecast/dtail/internal/protocol"
)
// GrepLineProcessor processes lines for grep operations without using channels.
// It writes directly to the output writer for better performance.
type GrepLineProcessor struct {
writer io.Writer
hostname string
plain bool
serverless bool
// Buffering for efficiency
writeBuf bytes.Buffer
bufSize int
mutex sync.Mutex
// Stats
linesProcessed uint64
bytesWritten uint64
}
var _ line.Processor = (*GrepLineProcessor)(nil)
// HandlerWriter adapts a ServerHandler to implement io.Writer
type HandlerWriter struct {
handler *ServerHandler
serverMessages chan<- string
}
// Write sends data through the server messages channel
func (w *HandlerWriter) Write(p []byte) (n int, err error) {
// Convert bytes to string and send through serverMessages channel
// This will be picked up by the handler's Read() method
message := string(p)
select {
case w.serverMessages <- message:
return len(p), nil
default:
return 0, fmt.Errorf("server messages channel full")
}
}
// NewGrepLineProcessor creates a new processor for grep operations.
func NewGrepLineProcessor(writer io.Writer, hostname string, plain, serverless bool) *GrepLineProcessor {
return &GrepLineProcessor{
writer: writer,
hostname: hostname,
plain: plain,
serverless: serverless,
bufSize: 64 * 1024, // 64KB buffer
}
}
// ProcessLine processes a single line and writes it to the output.
func (p *GrepLineProcessor) ProcessLine(lineContent *bytes.Buffer, lineNum uint64, sourceID string) error {
p.mutex.Lock()
defer p.mutex.Unlock()
if !p.plain && !p.serverless {
formatRemoteLine(&p.writeBuf, p.hostname, defaultTransmittedPerc, lineNum, sourceID, lineContent.Bytes())
} else {
p.writeBuf.Write(lineContent.Bytes())
p.writeBuf.WriteByte(protocol.MessageDelimiter)
}
// Recycle the line buffer
pool.RecycleBytesBuffer(lineContent)
// Update stats
p.linesProcessed++
p.bytesWritten += uint64(p.writeBuf.Len())
// Flush if buffer is getting full
if p.writeBuf.Len() >= p.bufSize {
return p.flushBuffer()
}
return nil
}
// Flush writes any buffered data to the output.
func (p *GrepLineProcessor) Flush() error {
p.mutex.Lock()
defer p.mutex.Unlock()
return p.flushBuffer()
}
// flushBuffer writes the buffer content to the writer (must be called with mutex held).
func (p *GrepLineProcessor) flushBuffer() error {
if p.writeBuf.Len() == 0 {
return nil
}
_, err := p.writer.Write(p.writeBuf.Bytes())
p.writeBuf.Reset()
return err
}
// Close cleans up the processor.
func (p *GrepLineProcessor) Close() error {
// Flush any remaining data
return p.Flush()
}
// Stats returns processing statistics.
func (p *GrepLineProcessor) Stats() (linesProcessed, bytesWritten uint64) {
p.mutex.Lock()
defer p.mutex.Unlock()
return p.linesProcessed, p.bytesWritten
}
// ServerMessageProcessor handles server messages separately from line data.
type ServerMessageProcessor struct {
writer io.Writer
hostname string
plain bool
serverless bool
mutex sync.Mutex
}
// NewServerMessageProcessor creates a processor for server messages.
func NewServerMessageProcessor(writer io.Writer, hostname string, plain, serverless bool) *ServerMessageProcessor {
return &ServerMessageProcessor{
writer: writer,
hostname: hostname,
plain: plain,
serverless: serverless,
}
}
// SendMessage sends a server message.
func (p *ServerMessageProcessor) SendMessage(message string) error {
if p.serverless {
return nil
}
p.mutex.Lock()
defer p.mutex.Unlock()
var buf bytes.Buffer
// Skip empty server messages when in plain mode
if p.plain && (message == "" || message == "\n") {
return nil
}
// Handle hidden messages
if len(message) > 0 && message[0] == '.' {
buf.WriteString(message)
buf.WriteByte(protocol.MessageDelimiter)
_, err := p.writer.Write(buf.Bytes())
return err
}
formatServerMessage(&buf, p.hostname, message, p.plain)
_, err := p.writer.Write(buf.Bytes())
return err
}
|
