-
Notifications
You must be signed in to change notification settings - Fork 2.7k
/
server.go
358 lines (328 loc) · 10.3 KB
/
server.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package observer
import (
"context"
"fmt"
"github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
grpcStatus "google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/wrapperspb"
observerpb "github.com/cilium/cilium/api/v1/observer"
relaypb "github.com/cilium/cilium/api/v1/relay"
"github.com/cilium/cilium/pkg/hubble/build"
"github.com/cilium/cilium/pkg/hubble/observer"
poolTypes "github.com/cilium/cilium/pkg/hubble/relay/pool/types"
)
// numUnavailableNodesReportMax represents the maximum number of unavailable
// nodes that should be reported on ServerStatus call. The intent is not to be
// exhaustive when listing them as reporting all unavailable nodes might
// clutter in certain cases.
// Reporting up to 10 unavailable nodes is probably reasonable.
const numUnavailableNodesReportMax = 10
// PeerLister is the interface that wraps the List method.
type PeerLister interface {
// List returns a list of peers with active connections. If a peer cannot
// be connected to; its Conn attribute must be nil.
List() []poolTypes.Peer
}
// PeerReporter is the interface that wraps the ReportOffline method.
type PeerReporter interface {
// ReportOffline allows the caller to report a peer as being offline. The
// peer is identified by its name.
ReportOffline(name string)
}
// PeerListReporter is the interface that groups the List and ReportOffline
// methods.
type PeerListReporter interface {
PeerLister
PeerReporter
}
// Server implements the observerpb.ObserverServer interface.
type Server struct {
opts options
peers PeerListReporter
}
// NewServer creates a new Server.
func NewServer(peers PeerListReporter, options ...Option) (*Server, error) {
opts := defaultOptions
for _, opt := range options {
if err := opt(&opts); err != nil {
return nil, fmt.Errorf("failed to apply option: %v", err)
}
}
return &Server{
opts: opts,
peers: peers,
}, nil
}
// GetFlows implements observerpb.ObserverServer.GetFlows by proxying requests to
// the hubble instance the proxy is connected to.
func (s *Server) GetFlows(req *observerpb.GetFlowsRequest, stream observerpb.Observer_GetFlowsServer) error {
ctx := stream.Context()
md, ok := metadata.FromIncomingContext(ctx)
if ok {
ctx = metadata.NewOutgoingContext(ctx, md)
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
peers := s.peers.List()
qlen := s.opts.sortBufferMaxLen // we don't want to buffer too many flows
if nqlen := req.GetNumber() * uint64(len(peers)); nqlen > 0 && nqlen < uint64(qlen) {
// don't make the queue bigger than necessary as it would be a problem
// with the priority queue (we pop out when the queue is full)
qlen = int(nqlen)
}
g, gctx := errgroup.WithContext(ctx)
flows := make(chan *observerpb.GetFlowsResponse, qlen)
var connectedNodes, unavailableNodes []string
for _, p := range peers {
if !isAvailable(p.Conn) {
s.opts.log.WithField("address", p.Address).Infof(
"No connection to peer %s, skipping", p.Name,
)
s.peers.ReportOffline(p.Name)
unavailableNodes = append(unavailableNodes, p.Name)
continue
}
connectedNodes = append(connectedNodes, p.Name)
p := p
g.Go(func() error {
// retrieveFlowsFromPeer returns blocks until the peer finishes
// the request by closing the connection, an error occurs,
// or gctx expires.
err := retrieveFlowsFromPeer(gctx, s.opts.ocb.observerClient(&p), req, flows)
if err != nil {
s.opts.log.WithFields(logrus.Fields{
"error": err,
"peer": p,
}).Warning("Failed to retrieve flows from peer")
select {
case flows <- nodeStatusError(err, p.Name):
case <-gctx.Done():
}
}
return nil
})
}
go func() {
g.Wait()
close(flows)
}()
aggregated := aggregateErrors(ctx, flows, s.opts.errorAggregationWindow)
sortedFlows := sortFlows(ctx, aggregated, qlen, s.opts.sortBufferDrainTimeout)
// inform the client about the nodes from which we expect to receive flows first
if len(connectedNodes) > 0 {
status := nodeStatusEvent(relaypb.NodeState_NODE_CONNECTED, connectedNodes...)
if err := stream.Send(status); err != nil {
return err
}
}
if len(unavailableNodes) > 0 {
status := nodeStatusEvent(relaypb.NodeState_NODE_UNAVAILABLE, unavailableNodes...)
if err := stream.Send(status); err != nil {
return err
}
}
sortedFlowsLoop:
for {
select {
case flow, ok := <-sortedFlows:
if !ok {
break sortedFlowsLoop
}
if err := stream.Send(flow); err != nil {
return err
}
case <-ctx.Done():
break sortedFlowsLoop
}
}
return g.Wait()
}
// GetAgentEvents implements observerpb.ObserverServer.GetAgentEvents by proxying requests to
// the hubble instance the proxy is connected to.
func (s *Server) GetAgentEvents(req *observerpb.GetAgentEventsRequest, stream observerpb.Observer_GetAgentEventsServer) error {
return grpcStatus.Errorf(codes.Unimplemented, "GetAgentEvents not yet implemented")
}
// GetDebugEvents implements observerpb.ObserverServer.GetDebugEvents by proxying requests to
// the hubble instance the proxy is connected to.
func (s *Server) GetDebugEvents(req *observerpb.GetDebugEventsRequest, stream observerpb.Observer_GetDebugEventsServer) error {
return grpcStatus.Errorf(codes.Unimplemented, "GetDebugEvents not yet implemented")
}
// GetNodes implements observerpb.ObserverClient.GetNodes.
func (s *Server) GetNodes(ctx context.Context, req *observerpb.GetNodesRequest) (*observerpb.GetNodesResponse, error) {
if md, ok := metadata.FromIncomingContext(ctx); ok {
ctx = metadata.NewOutgoingContext(ctx, md)
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
g, ctx := errgroup.WithContext(ctx)
peers := s.peers.List()
nodes := make([]*observerpb.Node, 0, len(peers))
for _, p := range peers {
n := &observerpb.Node{
Name: p.Name,
Tls: &observerpb.TLS{
Enabled: p.TLSEnabled,
ServerName: p.TLSServerName,
},
}
if p.Address != nil {
n.Address = p.Address.String()
}
nodes = append(nodes, n)
if !isAvailable(p.Conn) {
n.State = relaypb.NodeState_NODE_UNAVAILABLE
s.opts.log.WithField("address", p.Address).Infof(
"No connection to peer %s, skipping", p.Name,
)
s.peers.ReportOffline(p.Name)
continue
}
n.State = relaypb.NodeState_NODE_CONNECTED
p := p
g.Go(func() error {
n := n
client := s.opts.ocb.observerClient(&p)
status, err := client.ServerStatus(ctx, &observerpb.ServerStatusRequest{})
if err != nil {
n.State = relaypb.NodeState_NODE_ERROR
s.opts.log.WithFields(logrus.Fields{
"error": err,
"peer": p,
}).Warning("Failed to retrieve server status")
return nil
}
n.Version = status.GetVersion()
n.UptimeNs = status.GetUptimeNs()
n.MaxFlows = status.GetMaxFlows()
n.NumFlows = status.GetNumFlows()
n.SeenFlows = status.GetSeenFlows()
return nil
})
}
if err := g.Wait(); err != nil {
return nil, err
}
return &observerpb.GetNodesResponse{Nodes: nodes}, nil
}
// GetNamespaces implements observerpb.ObserverClient.GetNamespaces.
func (s *Server) GetNamespaces(ctx context.Context, req *observerpb.GetNamespacesRequest) (*observerpb.GetNamespacesResponse, error) {
if md, ok := metadata.FromIncomingContext(ctx); ok {
ctx = metadata.NewOutgoingContext(ctx, md)
}
// We are not using errgroup.WithContext because we will return partial
// results over failing on the first error
g := new(errgroup.Group)
namespaceManager := observer.NewNamespaceManager()
for _, p := range s.peers.List() {
if !isAvailable(p.Conn) {
s.opts.log.WithField("address", p.Address).Infof(
"No connection to peer %s, skipping", p.Name,
)
s.peers.ReportOffline(p.Name)
continue
}
p := p
g.Go(func() error {
client := s.opts.ocb.observerClient(&p)
nsResp, err := client.GetNamespaces(ctx, req)
if err != nil {
s.opts.log.WithFields(logrus.Fields{
"error": err,
"peer": p,
}).Warning("Failed to retrieve namespaces")
return nil
}
for _, ns := range nsResp.GetNamespaces() {
namespaceManager.AddNamespace(ns)
}
return nil
})
}
if err := g.Wait(); err != nil {
return nil, err
}
return &observerpb.GetNamespacesResponse{Namespaces: namespaceManager.GetNamespaces()}, nil
}
// ServerStatus implements observerpb.ObserverServer.ServerStatus by aggregating
// the ServerStatus answer of all hubble peers.
func (s *Server) ServerStatus(ctx context.Context, req *observerpb.ServerStatusRequest) (*observerpb.ServerStatusResponse, error) {
var (
cancel context.CancelFunc
g *errgroup.Group
)
md, ok := metadata.FromIncomingContext(ctx)
if ok {
ctx = metadata.NewOutgoingContext(ctx, md)
}
ctx, cancel = context.WithCancel(ctx)
defer cancel()
g, ctx = errgroup.WithContext(ctx)
peers := s.peers.List()
var numConnectedNodes, numUnavailableNodes uint32
var unavailableNodes []string
statuses := make(chan *observerpb.ServerStatusResponse, len(peers))
for _, p := range peers {
if !isAvailable(p.Conn) {
numUnavailableNodes++
s.opts.log.WithField("address", p.Address).Infof(
"No connection to peer %s, skipping", p.Name,
)
s.peers.ReportOffline(p.Name)
if len(unavailableNodes) < numUnavailableNodesReportMax {
unavailableNodes = append(unavailableNodes, p.Name)
}
continue
}
numConnectedNodes++
p := p
g.Go(func() error {
client := s.opts.ocb.observerClient(&p)
status, err := client.ServerStatus(ctx, req)
if err != nil {
s.opts.log.WithFields(logrus.Fields{
"error": err,
"peer": p,
}).Warning("Failed to retrieve server status")
return nil
}
select {
case statuses <- status:
case <-ctx.Done():
}
return nil
})
}
go func() {
g.Wait()
close(statuses)
}()
resp := &observerpb.ServerStatusResponse{
Version: build.RelayVersion.String(),
NumConnectedNodes: &wrapperspb.UInt32Value{
Value: numConnectedNodes,
},
NumUnavailableNodes: &wrapperspb.UInt32Value{
Value: numUnavailableNodes,
},
UnavailableNodes: unavailableNodes,
}
for status := range statuses {
if status == nil {
continue
}
resp.MaxFlows += status.MaxFlows
resp.NumFlows += status.NumFlows
resp.SeenFlows += status.SeenFlows
// use the oldest uptime as a reference for the uptime as cumulating
// values would make little sense
if resp.UptimeNs < status.UptimeNs {
resp.UptimeNs = status.UptimeNs
}
}
return resp, g.Wait()
}