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package fs
import (
"bytes"
"context"
"errors"
"os"
"path/filepath"
"reflect"
"testing"
"github.com/mimecast/dtail/internal/io/pool"
"github.com/mimecast/dtail/internal/lcontext"
"github.com/mimecast/dtail/internal/regex"
)
type captureProcessor struct {
lines []string
errAtLine int
processErr error
flushErr error
}
func (p *captureProcessor) ProcessLine(lineContent *bytes.Buffer, _ uint64, _ string) error {
p.lines = append(p.lines, lineContent.String())
pool.RecycleBytesBuffer(lineContent)
if p.errAtLine > 0 && len(p.lines) == p.errAtLine {
return p.processErr
}
return nil
}
func (p *captureProcessor) Flush() error {
return p.flushErr
}
func (p *captureProcessor) Close() error {
return nil
}
func TestStartWithProcessorOptimizedReadsAllLines(t *testing.T) {
filePath := writeProcessorTestFile(t, "alpha\nbeta\n")
re := regex.NewNoop()
cat := NewCatFile(filePath, "glob-id", make(chan string, 1), defaultMaxLineLength)
processor := &captureProcessor{}
if err := cat.readFile.StartWithProcessorOptimized(
context.Background(),
lcontext.LContext{},
processor,
re,
); err != nil {
t.Fatalf("optimized reader start failed: %v", err)
}
want := []string{"alpha\n", "beta\n"}
if !reflect.DeepEqual(processor.lines, want) {
t.Fatalf("unexpected processed lines: got=%v want=%v", processor.lines, want)
}
}
func TestProcessorVariantsReturnOpenError(t *testing.T) {
re := regex.NewNoop()
missingFile := filepath.Join(t.TempDir(), "missing.log")
tests := []struct {
name string
start func(*readFile, context.Context, lcontext.LContext, *captureProcessor, regex.Regex) error
}{
{
name: "standard",
start: func(rf *readFile, ctx context.Context, ltx lcontext.LContext, p *captureProcessor, re regex.Regex) error {
return rf.StartWithProcessor(ctx, ltx, p, re)
},
},
{
name: "optimized",
start: func(rf *readFile, ctx context.Context, ltx lcontext.LContext, p *captureProcessor, re regex.Regex) error {
return rf.StartWithProcessorOptimized(ctx, ltx, p, re)
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
cat := NewCatFile(missingFile, "glob-id", make(chan string, 1), defaultMaxLineLength)
err := tt.start(&cat.readFile, context.Background(), lcontext.LContext{}, &captureProcessor{}, re)
if err == nil {
t.Fatalf("expected error for missing file")
}
})
}
}
func TestStartWithProcessorOptimizedPropagatesProcessError(t *testing.T) {
filePath := writeProcessorTestFile(t, "alpha\nbeta\n")
re := regex.NewNoop()
expectedErr := errors.New("processor failure")
cat := NewCatFile(filePath, "glob-id", make(chan string, 1), defaultMaxLineLength)
processor := &captureProcessor{
errAtLine: 1,
processErr: expectedErr,
}
err := cat.readFile.StartWithProcessorOptimized(
context.Background(),
lcontext.LContext{},
processor,
re,
)
if !errors.Is(err, expectedErr) {
t.Fatalf("expected process error %v, got %v", expectedErr, err)
}
}
func TestStartWithProcessorOptimizedUsesInjectedMaxLineLength(t *testing.T) {
filePath := writeProcessorTestFile(t, "abcdef\n")
re := regex.NewNoop()
cat := NewCatFile(filePath, "glob-id", make(chan string, 1), 3)
processor := &captureProcessor{}
if err := cat.readFile.StartWithProcessorOptimized(
context.Background(),
lcontext.LContext{},
processor,
re,
); err != nil {
t.Fatalf("optimized reader start failed: %v", err)
}
want := []string{"abc", "def\n"}
if !reflect.DeepEqual(processor.lines, want) {
t.Fatalf("unexpected processed lines: got=%v want=%v", processor.lines, want)
}
}
func writeProcessorTestFile(t *testing.T, content string) string {
t.Helper()
filePath := filepath.Join(t.TempDir(), "test.log")
if err := os.WriteFile(filePath, []byte(content), 0600); err != nil {
t.Fatalf("unable to write test file: %v", err)
}
return filePath
}
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