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local_observer.go
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local_observer.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Hubble
package observer
import (
"context"
"errors"
"fmt"
"io"
"strings"
"sync/atomic"
"time"
"github.com/sirupsen/logrus"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/timestamppb"
flowpb "github.com/cilium/cilium/api/v1/flow"
observerpb "github.com/cilium/cilium/api/v1/observer"
v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
"github.com/cilium/cilium/pkg/hubble/build"
"github.com/cilium/cilium/pkg/hubble/container"
"github.com/cilium/cilium/pkg/hubble/filters"
"github.com/cilium/cilium/pkg/hubble/observer/observeroption"
observerTypes "github.com/cilium/cilium/pkg/hubble/observer/types"
"github.com/cilium/cilium/pkg/hubble/parser"
parserErrors "github.com/cilium/cilium/pkg/hubble/parser/errors"
nodeTypes "github.com/cilium/cilium/pkg/node/types"
)
// DefaultOptions to include in the server. Other packages may extend this
// in their init() function.
var DefaultOptions []observeroption.Option
// LocalObserverServer is an implementation of the server.Observer interface
// that's meant to be run embedded inside the Cilium process. It ignores all
// the state change events since the state is available locally.
type LocalObserverServer struct {
// ring buffer that contains the references of all flows
ring *container.Ring
// events is the channel used by the writer(s) to send the flow data
// into the observer server.
events chan *observerTypes.MonitorEvent
// stopped is mostly used in unit tests to signalize when the events
// channel is empty, once it's closed.
stopped chan struct{}
log logrus.FieldLogger
// payloadParser decodes flowpb.Payload into flowpb.Flow
payloadParser *parser.Parser
opts observeroption.Options
// startTime is the time when this instance was started
startTime time.Time
// numObservedFlows counts how many flows have been observed
numObservedFlows uint64
}
// NewLocalServer returns a new local observer server.
func NewLocalServer(
payloadParser *parser.Parser,
logger logrus.FieldLogger,
options ...observeroption.Option,
) (*LocalObserverServer, error) {
opts := observeroption.Default // start with defaults
options = append(options, DefaultOptions...)
for _, opt := range options {
if err := opt(&opts); err != nil {
return nil, fmt.Errorf("failed to apply option: %v", err)
}
}
logger.WithFields(logrus.Fields{
"maxFlows": opts.MaxFlows,
"eventQueueSize": opts.MonitorBuffer,
}).Info("Configuring Hubble server")
s := &LocalObserverServer{
log: logger,
ring: container.NewRing(opts.MaxFlows),
events: make(chan *observerTypes.MonitorEvent, opts.MonitorBuffer),
stopped: make(chan struct{}),
payloadParser: payloadParser,
startTime: time.Now(),
opts: opts,
}
for _, f := range s.opts.OnServerInit {
err := f.OnServerInit(s)
if err != nil {
s.log.WithError(err).Error("failed in OnServerInit")
return nil, err
}
}
return s, nil
}
// Start implements GRPCServer.Start.
func (s *LocalObserverServer) Start() {
// We use a cancellation context here so that any goroutines spawned in the
// OnMonitorEvent/OnDecodedFlow/OnDecodedEvent hooks have a signal for cancellation.
// When Start() returns, the deferred cancel() will run and we expect hooks
// to stop any goroutines that may have spawned by listening to the
// ctx.Done() channel for the stop signal.
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
nextEvent:
for monitorEvent := range s.GetEventsChannel() {
for _, f := range s.opts.OnMonitorEvent {
stop, err := f.OnMonitorEvent(ctx, monitorEvent)
if err != nil {
s.log.WithError(err).WithField("event", monitorEvent).Info("failed in OnMonitorEvent")
}
if stop {
continue nextEvent
}
}
ev, err := s.payloadParser.Decode(monitorEvent)
if err != nil {
switch {
case
// silently ignore unknown or skipped events
errors.Is(err, parserErrors.ErrUnknownEventType),
errors.Is(err, parserErrors.ErrEventSkipped),
// silently ignore perf ring buffer events with unknown types,
// since they are not intended for us (e.g. MessageTypeRecCapture)
parserErrors.IsErrInvalidType(err):
default:
s.log.WithError(err).WithField("event", monitorEvent).Debug("failed to decode payload")
}
continue
}
if flow, ok := ev.Event.(*flowpb.Flow); ok {
for _, f := range s.opts.OnDecodedFlow {
stop, err := f.OnDecodedFlow(ctx, flow)
if err != nil {
s.log.WithError(err).WithField("event", monitorEvent).Info("failed in OnDecodedFlow")
}
if stop {
continue nextEvent
}
}
atomic.AddUint64(&s.numObservedFlows, 1)
}
for _, f := range s.opts.OnDecodedEvent {
stop, err := f.OnDecodedEvent(ctx, ev)
if err != nil {
s.log.WithError(err).WithField("event", ev).Info("failed in OnDecodedEvent")
}
if stop {
continue nextEvent
}
}
s.GetRingBuffer().Write(ev)
}
close(s.GetStopped())
}
// GetEventsChannel returns the event channel to receive flowpb.Payload events.
func (s *LocalObserverServer) GetEventsChannel() chan *observerTypes.MonitorEvent {
return s.events
}
// GetRingBuffer implements GRPCServer.GetRingBuffer.
func (s *LocalObserverServer) GetRingBuffer() *container.Ring {
return s.ring
}
// GetLogger implements GRPCServer.GetLogger.
func (s *LocalObserverServer) GetLogger() logrus.FieldLogger {
return s.log
}
// GetStopped implements GRPCServer.GetStopped.
func (s *LocalObserverServer) GetStopped() chan struct{} {
return s.stopped
}
// GetPayloadParser implements GRPCServer.GetPayloadParser.
func (s *LocalObserverServer) GetPayloadParser() *parser.Parser {
return s.payloadParser
}
// GetOptions implements serveroptions.Server.GetOptions.
func (s *LocalObserverServer) GetOptions() observeroption.Options {
return s.opts
}
// ServerStatus should have a comment, apparently. It returns the server status.
func (s *LocalObserverServer) ServerStatus(
ctx context.Context, req *observerpb.ServerStatusRequest,
) (*observerpb.ServerStatusResponse, error) {
return &observerpb.ServerStatusResponse{
Version: build.ServerVersion.String(),
MaxFlows: s.GetRingBuffer().Cap(),
NumFlows: s.GetRingBuffer().Len(),
SeenFlows: atomic.LoadUint64(&s.numObservedFlows),
UptimeNs: uint64(time.Since(s.startTime).Nanoseconds()),
}, nil
}
// GetNodes implements observerpb.ObserverClient.GetNodes.
func (s *LocalObserverServer) GetNodes(ctx context.Context, req *observerpb.GetNodesRequest) (*observerpb.GetNodesResponse, error) {
return nil, status.Errorf(codes.Unimplemented, "GetNodes not implemented")
}
// GetFlows implements the proto method for client requests.
func (s *LocalObserverServer) GetFlows(
req *observerpb.GetFlowsRequest,
server observerpb.Observer_GetFlowsServer,
) (err error) {
if err := validateRequest(req); err != nil {
return err
}
// This context is used for goroutines spawned specifically to serve this
// request, meaning it must be cancelled once the request is done and this
// function returns.
ctx, cancel := context.WithCancel(server.Context())
defer cancel()
for _, f := range s.opts.OnGetFlows {
ctx, err = f.OnGetFlows(ctx, req)
if err != nil {
return err
}
}
filterList := append(filters.DefaultFilters, s.opts.OnBuildFilter...)
whitelist, err := filters.BuildFilterList(ctx, req.Whitelist, filterList)
if err != nil {
return err
}
blacklist, err := filters.BuildFilterList(ctx, req.Blacklist, filterList)
if err != nil {
return err
}
start := time.Now()
log := s.GetLogger()
ring := s.GetRingBuffer()
i := uint64(0)
defer func() {
log.WithFields(logrus.Fields{
"number_of_flows": i,
"buffer_size": ring.Cap(),
"whitelist": logFilters(req.Whitelist),
"blacklist": logFilters(req.Blacklist),
"took": time.Since(start),
}).Debug("GetFlows finished")
}()
ringReader, err := newRingReader(ring, req, whitelist, blacklist)
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
eventsReader, err := newEventsReader(ringReader, req, log, whitelist, blacklist)
if err != nil {
return err
}
nextEvent:
for ; ; i++ {
e, err := eventsReader.Next(ctx)
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
var resp *observerpb.GetFlowsResponse
switch ev := e.Event.(type) {
case *flowpb.Flow:
eventsReader.eventCount++
for _, f := range s.opts.OnFlowDelivery {
stop, err := f.OnFlowDelivery(ctx, ev)
switch {
case err != nil:
return err
case stop:
continue nextEvent
}
}
resp = &observerpb.GetFlowsResponse{
Time: ev.GetTime(),
NodeName: ev.GetNodeName(),
ResponseTypes: &observerpb.GetFlowsResponse_Flow{
Flow: ev,
},
}
case *flowpb.LostEvent:
// Don't increment eventsReader.eventCount as a LostEvent is an
// event type that is never explicitly requested by the user (e.g.
// when a query asks for 20 events, then lost events should not be
// accounted for as they are not events per se but an indication
// that some event was lost).
resp = &observerpb.GetFlowsResponse{
Time: e.Timestamp,
NodeName: nodeTypes.GetAbsoluteNodeName(),
ResponseTypes: &observerpb.GetFlowsResponse_LostEvents{
LostEvents: ev,
},
}
}
if resp == nil {
continue
}
err = server.Send(resp)
if err != nil {
return err
}
}
}
// GetAgentEvents implements observerpb.ObserverClient.GetAgentEvents.
func (s *LocalObserverServer) GetAgentEvents(
req *observerpb.GetAgentEventsRequest,
server observerpb.Observer_GetAgentEventsServer,
) (err error) {
if err := validateRequest(req); err != nil {
return err
}
ctx, cancel := context.WithCancel(server.Context())
defer cancel()
var whitelist, blacklist filters.FilterFuncs
start := time.Now()
log := s.GetLogger()
ring := s.GetRingBuffer()
i := uint64(0)
defer func() {
log.WithFields(logrus.Fields{
"number_of_agent_events": i,
"buffer_size": ring.Cap(),
"took": time.Since(start),
}).Debug("GetAgentEvents finished")
}()
ringReader, err := newRingReader(ring, req, whitelist, blacklist)
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
eventsReader, err := newEventsReader(ringReader, req, log, whitelist, blacklist)
if err != nil {
return err
}
for ; ; i++ {
e, err := eventsReader.Next(ctx)
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
switch ev := e.Event.(type) {
case *flowpb.AgentEvent:
eventsReader.eventCount++
resp := &observerpb.GetAgentEventsResponse{
Time: e.Timestamp,
NodeName: nodeTypes.GetAbsoluteNodeName(),
AgentEvent: ev,
}
err = server.Send(resp)
if err != nil {
return err
}
}
}
}
// GetDebugEvents implements observerpb.ObserverClient.GetDebugEvents.
func (s *LocalObserverServer) GetDebugEvents(
req *observerpb.GetDebugEventsRequest,
server observerpb.Observer_GetDebugEventsServer,
) (err error) {
if err := validateRequest(req); err != nil {
return err
}
ctx, cancel := context.WithCancel(server.Context())
defer cancel()
var whitelist, blacklist filters.FilterFuncs
start := time.Now()
log := s.GetLogger()
ring := s.GetRingBuffer()
i := uint64(0)
defer func() {
log.WithFields(logrus.Fields{
"number_of_debug_events": i,
"buffer_size": ring.Cap(),
"took": time.Since(start),
}).Debug("GetDebugEvents finished")
}()
ringReader, err := newRingReader(ring, req, whitelist, blacklist)
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
eventsReader, err := newEventsReader(ringReader, req, log, whitelist, blacklist)
if err != nil {
return err
}
for ; ; i++ {
e, err := eventsReader.Next(ctx)
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
switch ev := e.Event.(type) {
case *flowpb.DebugEvent:
eventsReader.eventCount++
resp := &observerpb.GetDebugEventsResponse{
Time: e.Timestamp,
NodeName: nodeTypes.GetAbsoluteNodeName(),
DebugEvent: ev,
}
err = server.Send(resp)
if err != nil {
return err
}
}
}
}
func logFilters(filters []*flowpb.FlowFilter) string {
s := make([]string, 0, len(filters))
for _, f := range filters {
s = append(s, f.String())
}
return "{" + strings.Join(s, ",") + "}"
}
// genericRequest allows to abstract away generic request information for
// GetFlowsRequest, GetAgentEventsRequest and GetDebugEventsRequest.
type genericRequest interface {
GetNumber() uint64
GetFollow() bool
GetSince() *timestamppb.Timestamp
GetUntil() *timestamppb.Timestamp
GetFirst() bool
}
var (
_ genericRequest = (*observerpb.GetFlowsRequest)(nil)
_ genericRequest = (*observerpb.GetAgentEventsRequest)(nil)
_ genericRequest = (*observerpb.GetDebugEventsRequest)(nil)
)
// eventsReader reads flows using a RingReader. It applies the GetFlows request
// criteria (blacklist, whitelist, follow, ...) before returning events.
type eventsReader struct {
ringReader *container.RingReader
whitelist, blacklist filters.FilterFuncs
maxEvents uint64
follow, timeRange bool
eventCount uint64
since, until *time.Time
}
// newEventsReader creates a new eventsReader that uses the given RingReader to
// read through the ring buffer. Only events that match the request criteria
// are returned.
func newEventsReader(r *container.RingReader, req genericRequest, log logrus.FieldLogger, whitelist, blacklist filters.FilterFuncs) (*eventsReader, error) {
log.WithFields(logrus.Fields{
"req": req,
"whitelist": whitelist,
"blacklist": blacklist,
}).Debug("creating a new eventsReader")
since, until := req.GetSince(), req.GetUntil()
reader := &eventsReader{
ringReader: r,
whitelist: whitelist,
blacklist: blacklist,
maxEvents: req.GetNumber(),
follow: req.GetFollow(),
timeRange: since != nil || until != nil,
}
if since != nil {
if err := since.CheckValid(); err != nil {
return nil, err
}
sinceTime := since.AsTime()
reader.since = &sinceTime
}
if until != nil {
if err := until.CheckValid(); err != nil {
return nil, err
}
untilTime := until.AsTime()
reader.until = &untilTime
}
return reader, nil
}
// Next returns the next event that matches the request criteria.
func (r *eventsReader) Next(ctx context.Context) (*v1.Event, error) {
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
var e *v1.Event
var err error
if r.follow {
e = r.ringReader.NextFollow(ctx)
} else {
if r.maxEvents > 0 && (r.eventCount >= r.maxEvents) {
return nil, io.EOF
}
e, err = r.ringReader.Next()
if err != nil {
return nil, err
}
}
if e == nil {
return nil, io.EOF
}
// Treat LostEvent as a special case as callers will never explicitly
// request them. This means that no regular filter nor time range
// filter should be applied.
// Note: lost events don't respect the assumption that "ring buffer
// timestamps are supposed to be monotonic" as their timestamp
// corresponds to when a LostEvent was detected.
_, isLostEvent := e.Event.(*flowpb.LostEvent)
if !isLostEvent {
if r.timeRange {
if err := e.Timestamp.CheckValid(); err != nil {
return nil, err
}
ts := e.Timestamp.AsTime()
if r.until != nil && ts.After(*r.until) {
return nil, io.EOF
}
if r.since != nil && ts.Before(*r.since) {
continue
}
}
if !filters.Apply(r.whitelist, r.blacklist, e) {
continue
}
}
return e, nil
}
}
func validateRequest(req genericRequest) error {
if req.GetFirst() && req.GetFollow() {
return status.Errorf(codes.InvalidArgument, "first cannot be specified with follow")
}
return nil
}
// newRingReader creates a new RingReader that starts at the correct ring
// offset to match the flow request.
func newRingReader(ring *container.Ring, req genericRequest, whitelist, blacklist filters.FilterFuncs) (*container.RingReader, error) {
since := req.GetSince()
// since takes precedence over Number (--first and --last)
if req.GetFirst() && since == nil {
// Start from the beginning of the ring.
return container.NewRingReader(ring, ring.OldestWrite()), nil
}
if req.GetFollow() && req.GetNumber() == 0 && since == nil {
// no need to rewind
return container.NewRingReader(ring, ring.LastWriteParallel()), nil
}
var sinceTime time.Time
if since != nil {
if err := since.CheckValid(); err != nil {
return nil, err
}
sinceTime = since.AsTime()
}
idx := ring.LastWriteParallel()
reader := container.NewRingReader(ring, idx)
var eventCount uint64
// We need to find out what the right index is; that is the index with the
// oldest entry that is within time range boundaries (if any is defined)
// or until we find enough events.
// In order to avoid buffering events, we have to rewind first to find the
// correct index, then create a new reader that starts from there
for i := ring.Len(); i > 0; i, idx = i-1, idx-1 {
e, err := reader.Previous()
lost := e.GetLostEvent()
if lost != nil && lost.Source == flowpb.LostEventSource_HUBBLE_RING_BUFFER {
idx++ // we went backward 1 too far
break
} else if err != nil {
return nil, err
}
// Note: LostEvent type is ignored here and this is expected as lost
// events will never be explicitly requested by the caller
_, isLostEvent := e.Event.(*flowpb.LostEvent)
if isLostEvent || !filters.Apply(whitelist, blacklist, e) {
continue
}
eventCount++
if since != nil {
if err := e.Timestamp.CheckValid(); err != nil {
return nil, err
}
ts := e.Timestamp.AsTime()
if ts.Before(sinceTime) {
idx++ // we went backward 1 too far
break
}
} else if eventCount == req.GetNumber() {
break // we went backward far enough
}
}
return container.NewRingReader(ring, idx), nil
}