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package internal
import (
"context"
"errors"
"strings"
"sync"
"time"
"ior/internal/event"
"ior/internal/flags"
"ior/internal/globalfilter"
"ior/internal/parquet"
"ior/internal/probemanager"
"ior/internal/streamrow"
)
// headlessParquetSink streams traced events directly to a Parquet file,
// cancelling the trace context on any recorder error.
type headlessParquetSink struct {
recorder *parquet.Recorder
seq *streamrow.Sequencer
cancel context.CancelFunc
mu sync.Mutex
recErr error
}
func newHeadlessParquetSink(recorder *parquet.Recorder, cancel context.CancelFunc) *headlessParquetSink {
return &headlessParquetSink{
recorder: recorder,
seq: streamrow.NewSequencer(0),
cancel: cancel,
}
}
// configure wires the event loop's print callback to record each pair to Parquet.
func (s *headlessParquetSink) configure(el *eventLoop) {
el.printCb = func(ep *event.Pair) {
row := streamrow.New(s.seq.Next(), ep)
if err := s.recorder.Record(row, 0); err != nil {
s.fail(err)
}
ep.Recycle()
}
}
func (s *headlessParquetSink) fail(err error) {
s.mu.Lock()
defer s.mu.Unlock()
if s.recErr != nil {
return
}
s.recErr = err
s.cancel()
}
func (s *headlessParquetSink) err() error {
s.mu.Lock()
defer s.mu.Unlock()
return s.recErr
}
// isHeadlessParquetMode reports whether cfg specifies a headless Parquet recording run.
func isHeadlessParquetMode(cfg flags.Config) bool {
return strings.TrimSpace(cfg.ParquetPath) != ""
}
// hasHeadlessParquetContentFilters reports whether cfg carries filters that are
// incompatible with headless Parquet mode. PID filtering is still allowed so
// focused headless recordings can avoid tracing unrelated system activity.
func hasHeadlessParquetContentFilters(cfg flags.Config) bool {
return cfg.CommFilter != "" ||
cfg.PathFilter != "" ||
cfg.TidFilter > 0 ||
cfg.GlobalFilter.IsActive()
}
// headlessParquetTraceConfig strips TUI-only flags from cfg so that the
// headless Parquet run records a clean event stream, optionally scoped by PID.
func headlessParquetTraceConfig(cfg flags.Config) flags.Config {
out := cfg
out.PlainMode = false
out.FlamegraphOutput = false
out.CommFilter = ""
out.PathFilter = ""
out.TidFilter = -1
out.GlobalFilter = globalfilter.Filter{}
return out
}
// runHeadlessParquet records all traced syscalls directly to a Parquet file
// without starting the TUI. Root privilege is checked by the mode handler
// (via runnerDeps.getEUID) before this function is invoked.
func runHeadlessParquet(cfg flags.Config) error {
cfg = headlessParquetTraceConfig(cfg)
logln := newLogger(true)
ch, ctx, cancel, profiling, el, mgr, cleanup, err := setupHeadlessParquetInfra(cfg, logln)
if err != nil {
return err
}
defer cleanup()
defer profiling.stop(logln)
defer cancel()
recorder := parquet.NewRecorder(parquet.RecorderConfig{})
if err := recorder.Start(cfg.ParquetPath, parquet.StartOptions{Metadata: parquet.NewFileMetadata("headless")}); err != nil {
return err
}
sink := newHeadlessParquetSink(recorder, cancel)
// sink.configure wires the event loop's print callback to record each pair
// to Parquet; the mgr filter wraps it to skip inactive probes.
configureEventLoopOutput(el, mgr, sink.configure)
// startTraceShutdownWatcher returns a done channel that must be drained
// before returning to prevent a goroutine leak when ctx is cancelled but
// the goroutine has not yet exited.
watcherDone := startTraceShutdownWatcher(ctx, true, el, profiling, logln)
startTime := time.Now()
el.run(ctx, ch)
totalDuration := time.Since(startTime)
<-watcherDone
<-profiling.done
stopErr := recorder.Stop()
if err := sink.err(); err != nil {
if stopErr != nil && !errors.Is(stopErr, err) {
return errors.Join(err, stopErr)
}
return err
}
if stopErr != nil {
return stopErr
}
logln("Good bye... (unloading BPF tracepoints will take a few seconds...) after", totalDuration)
return nil
}
// setupHeadlessParquetInfra creates the BPF module, event channel, trace
// context, profiling control, and event loop for a headless Parquet run.
// mgr is returned so the caller can pass it to configureEventLoopOutput with
// the sink callback after the Parquet recorder has been started.
// cleanup must be deferred by the caller; it stops ring-buffer polling,
// detaches probes, releases BPF bindings, and stops signal handling.
func setupHeadlessParquetInfra(cfg flags.Config, logln func(...any)) (
ch <-chan []byte,
ctx context.Context,
cancel context.CancelFunc,
profiling *profilingControl,
el *eventLoop,
mgr *probemanager.Manager,
cleanup func(),
err error,
) {
bpfModule, mgr, releaseBindings, err := setupBPFModule(context.Background(), cfg)
if err != nil {
return nil, nil, nil, nil, nil, nil, func() {}, err
}
eventCh, rb, err := setupEventChannel(bpfModule)
if err != nil {
bpfModule.Close()
return nil, nil, nil, nil, nil, nil, func() {}, err
}
ctx, cancel, stopSignals := setupTraceContext(context.Background(), cfg, logln)
profiling, err = setupProfiling(ctx, cfg, nil)
if err != nil {
cancel()
stopSignals()
rb.Stop()
bpfModule.Close()
return nil, nil, nil, nil, nil, nil, func() {}, err
}
el, err = newEventLoop(newEventLoopConfig(cfg))
if err != nil {
cancel()
stopSignals()
rb.Stop()
bpfModule.Close()
return nil, nil, nil, nil, nil, nil, func() {}, err
}
cleanup = func() {
// Stop the ring-buffer polling goroutine before the module is closed.
// rb.Stop() is idempotent; bpfModule.Close() calls rb.Close() for the C struct.
rb.Stop()
if err := mgr.Close(); err != nil {
logln("BPF probe manager close error:", err)
}
releaseBindings()
bpfModule.Close()
stopSignals()
}
return eventCh, ctx, cancel, profiling, el, mgr, cleanup, nil
}
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