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package handlers
import (
"bytes"
"testing"
)
// TestGrepLineProcessor_StatsBytesWrittenMatchesOutput verifies that the
// bytesWritten stat counts each line's formatted bytes exactly once even
// though writeBuf accumulates many lines before flushing. Regression test:
// the stat used to add the whole accumulated buffer length per line, so it
// grew quadratically with the number of buffered lines.
func TestGrepLineProcessor_StatsBytesWrittenMatchesOutput(t *testing.T) {
tests := []struct {
name string
plain bool
serverless bool
}{
{name: "plain", plain: true, serverless: false},
{name: "network formatted", plain: false, serverless: false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var buf bytes.Buffer
p := NewGrepLineProcessor(&buf, "testhost", tt.plain, tt.serverless)
// All lines stay buffered (well below the 64KB flush threshold)
// until Flush, so bytesWritten must equal the flushed output size.
const numLines = 50
for i := uint64(1); i <= numLines; i++ {
line := bytes.NewBufferString("grep match line")
if err := p.ProcessLine(line, i, "source.log"); err != nil {
t.Fatalf("ProcessLine failed on line %d: %v", i, err)
}
}
if err := p.Flush(); err != nil {
t.Fatalf("Flush failed: %v", err)
}
lines, bytesWritten := p.Stats()
if lines != numLines {
t.Errorf("Expected %d lines processed, got %d", numLines, lines)
}
if want := uint64(buf.Len()); bytesWritten != want {
t.Errorf("Expected bytesWritten %d (flushed output size), got %d", want, bytesWritten)
}
})
}
}
// TestGrepLineProcessor_StatsBytesWrittenAcrossFlushThreshold verifies the
// bytesWritten stat stays exact when the buffer crosses the flush threshold
// several times during processing.
func TestGrepLineProcessor_StatsBytesWrittenAcrossFlushThreshold(t *testing.T) {
var buf bytes.Buffer
p := NewGrepLineProcessor(&buf, "testhost", true, false)
p.bufSize = 32 // Force several intermediate flushes.
const numLines = 20
content := "0123456789" // 11 bytes with the message delimiter.
for i := uint64(1); i <= numLines; i++ {
if err := p.ProcessLine(bytes.NewBufferString(content), i, "source.log"); err != nil {
t.Fatalf("ProcessLine failed on line %d: %v", i, err)
}
}
if err := p.Flush(); err != nil {
t.Fatalf("Flush failed: %v", err)
}
lines, bytesWritten := p.Stats()
if lines != numLines {
t.Errorf("Expected %d lines processed, got %d", numLines, lines)
}
want := uint64(numLines * (len(content) + 1))
if bytesWritten != want {
t.Errorf("Expected bytesWritten %d, got %d", want, bytesWritten)
}
if got := uint64(buf.Len()); got != want {
t.Errorf("Expected flushed output size %d, got %d", want, got)
}
}
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