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package internal
import (
"fmt"
"sync/atomic"
"time"
"ior/internal/event"
"ior/internal/file"
"ior/internal/globalfilter"
"ior/internal/types"
)
const sysEnterNameToHandleAtName = "name_to_handle_at"
const (
defaultCommLookupWorkers = 4
defaultCommLookupQueueSize = 512
defaultMaxPendingEnterEvs = 16384
defaultMaxPendingHandleEntries = 8192
defaultMaxProcFdCacheSize = 8192
cacheTrimDivisor = 4
)
type eventLoopConfig struct {
pidFilter int
filter globalfilter.Filter
collapsedFields []string
countField string
pprofEnable bool
plainMode bool
// synchronousRawProcessing keeps raw decode and callback emission in a
// single goroutine for deterministic test execution.
synchronousRawProcessing bool
fdTracker *fdTracker
commResolver *commResolver
}
type rawEventHandler func(raw []byte, ch chan<- *event.Pair)
type eventLoop struct {
// filterPtr holds the active global filter. Stored as atomic.Pointer so
// the TUI can swap filters in place via SetFilter without tearing down
// and reattaching the BPF probes (the previous behavior caused a multi-
// second 'Attaching tracepoints' overlay every time the filter changed).
filterPtr atomic.Pointer[globalfilter.Filter]
pairs pairTracker // enter/exit pairing state and inter-syscall duration tracking
pendingHandles *pendingHandleTracker // TID → pathname from name_to_handle_at, for open_by_handle_at correlation
fdTracker *fdTracker // fd table and procfs resolution cache
commResolver *commResolver
outputFormatter // pair-emission and warning-notification callbacks (embedded collaborator)
rawHandlers map[types.EventType]rawEventHandler
cfg eventLoopConfig
// Statistics
numTracepoints uint
numTracepointMismatches uint
numSyscalls uint
numSyscallsAfterFilter uint
startTime time.Time
done chan struct{}
}
// Filter returns a snapshot of the currently active global filter. Each call
// loads a single atomic pointer and returns the underlying value, so the
// caller observes a consistent filter even if SetFilter races concurrently.
func (e *eventLoop) Filter() globalfilter.Filter {
if p := e.filterPtr.Load(); p != nil {
return *p
}
return globalfilter.Filter{}
}
// SetFilter atomically replaces the active global filter. The replacement is
// cloned so the caller can keep mutating its own filter without affecting
// what the eventloop sees.
func (e *eventLoop) SetFilter(filter globalfilter.Filter) {
cloned := filter.Clone()
e.filterPtr.Store(&cloned)
}
func newEventLoop(cfg eventLoopConfig) (*eventLoop, error) {
fdState := configuredFDTracker(cfg.fdTracker)
commState := configuredCommResolver(cfg.commResolver)
if err := cfg.filter.ValidateTracepointFields(); err != nil {
return nil, fmt.Errorf("create event filter: %w", err)
}
el := &eventLoop{
pairs: newPairTracker(),
pendingHandles: newPendingHandleTracker(),
fdTracker: fdState,
commResolver: commState,
// Default printCb prints each pair to stdout then recycles it; callers
// (e.g. TUI, headless-parquet) replace this via configureEventLoopOutput.
outputFormatter: outputFormatter{
printCb: func(ep *event.Pair) { fmt.Println(ep); ep.Recycle() },
},
rawHandlers: make(map[types.EventType]rawEventHandler),
cfg: cfg,
done: make(chan struct{}),
}
el.SetFilter(cfg.filter)
el.initRawHandlers()
el.configureOutputCallback()
el.seedTrackedPidComm()
return el, nil
}
func configuredFDTracker(injected *fdTracker) *fdTracker {
if injected == nil {
return newFDTracker(nil)
}
if injected.files == nil {
injected.files = make(map[int32]file.File)
}
return injected
}
func configuredCommResolver(injected *commResolver) *commResolver {
if injected == nil {
return newCommResolver(nil)
}
if injected.comms == nil {
injected.comms = make(map[uint32]string)
}
if injected.pending == nil {
injected.pending = make(map[uint32]struct{})
}
injected.ensureLookupConfig()
return injected
}
func (e *eventLoop) seedTrackedPidComm() {
e.commState().seedTrackedPidComm(e.cfg.pidFilter)
}
func (e *eventLoop) fdState() *fdTracker {
if e.fdTracker == nil {
e.fdTracker = newFDTracker(nil)
}
if e.fdTracker.files == nil {
e.fdTracker.files = make(map[int32]file.File)
}
return e.fdTracker
}
func (e *eventLoop) pendingHandleState() *pendingHandleTracker {
if e.pendingHandles == nil {
e.pendingHandles = newPendingHandleTracker()
}
if e.pendingHandles.paths == nil {
e.pendingHandles.paths = make(map[uint32]string)
}
if e.pendingHandles.pathAges == nil {
e.pendingHandles.pathAges = make(map[uint32]uint64)
}
return e.pendingHandles
}
func (e *eventLoop) commState() *commResolver {
if e.commResolver == nil {
e.commResolver = newCommResolver(nil)
}
if e.commResolver.comms == nil {
e.commResolver.comms = make(map[uint32]string)
}
if e.commResolver.pending == nil {
e.commResolver.pending = make(map[uint32]struct{})
}
if e.commResolver.warningFn == nil {
e.commResolver.warningFn = e.notifyWarning
}
e.commResolver.ensureLookupConfig()
return e.commResolver
}
func (e *eventLoop) configureOutputCallback() {
switch {
case e.cfg.pprofEnable:
e.printCb = func(ep *event.Pair) {
ep.Recycle()
}
}
}
func (e *eventLoop) stats() string {
fmt.Println("Waiting for stats to be ready")
<-e.done
duration := time.Since(e.startTime)
secs := duration.Seconds()
// Guard against division by zero when called immediately after start.
rate := func(n uint64) float64 {
if secs <= 0 {
return 0
}
return float64(n) / secs
}
mismatchPct := 0.0
if e.numTracepoints > 0 {
mismatchPct = (float64(e.numTracepointMismatches) / float64(e.numTracepoints)) * 100
}
stats := fmt.Sprintf(
"Statistics:\n"+
"\tduration: %v\n"+
"\ttracepoints: %v (%.2f/s) with %d mismatches (%.2f%%)\n"+
"\tsyscalls: %d (%.2f/s)\n"+
"\tsyscalls after filter: %d (%.2f/s)\n",
duration,
e.numTracepoints, rate(uint64(e.numTracepoints)), e.numTracepointMismatches, mismatchPct,
e.numSyscalls, rate(uint64(e.numSyscalls)),
e.numSyscallsAfterFilter, rate(uint64(e.numSyscallsAfterFilter)),
)
return stats
}
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