Holger Hildebrandt | fa07499 | 2020-03-27 15:42:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2018 gRPC authors. |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | package channelz |
| 20 | |
| 21 | import ( |
| 22 | "net" |
| 23 | "sync" |
| 24 | "sync/atomic" |
| 25 | "time" |
| 26 | |
| 27 | "google.golang.org/grpc/connectivity" |
| 28 | "google.golang.org/grpc/credentials" |
| 29 | "google.golang.org/grpc/grpclog" |
| 30 | ) |
| 31 | |
| 32 | // entry represents a node in the channelz database. |
| 33 | type entry interface { |
| 34 | // addChild adds a child e, whose channelz id is id to child list |
| 35 | addChild(id int64, e entry) |
| 36 | // deleteChild deletes a child with channelz id to be id from child list |
| 37 | deleteChild(id int64) |
| 38 | // triggerDelete tries to delete self from channelz database. However, if child |
| 39 | // list is not empty, then deletion from the database is on hold until the last |
| 40 | // child is deleted from database. |
| 41 | triggerDelete() |
| 42 | // deleteSelfIfReady check whether triggerDelete() has been called before, and whether child |
| 43 | // list is now empty. If both conditions are met, then delete self from database. |
| 44 | deleteSelfIfReady() |
| 45 | // getParentID returns parent ID of the entry. 0 value parent ID means no parent. |
| 46 | getParentID() int64 |
| 47 | } |
| 48 | |
| 49 | // dummyEntry is a fake entry to handle entry not found case. |
| 50 | type dummyEntry struct { |
| 51 | idNotFound int64 |
| 52 | } |
| 53 | |
| 54 | func (d *dummyEntry) addChild(id int64, e entry) { |
| 55 | // Note: It is possible for a normal program to reach here under race condition. |
| 56 | // For example, there could be a race between ClientConn.Close() info being propagated |
| 57 | // to addrConn and http2Client. ClientConn.Close() cancel the context and result |
| 58 | // in http2Client to error. The error info is then caught by transport monitor |
| 59 | // and before addrConn.tearDown() is called in side ClientConn.Close(). Therefore, |
| 60 | // the addrConn will create a new transport. And when registering the new transport in |
| 61 | // channelz, its parent addrConn could have already been torn down and deleted |
| 62 | // from channelz tracking, and thus reach the code here. |
| 63 | grpclog.Infof("attempt to add child of type %T with id %d to a parent (id=%d) that doesn't currently exist", e, id, d.idNotFound) |
| 64 | } |
| 65 | |
| 66 | func (d *dummyEntry) deleteChild(id int64) { |
| 67 | // It is possible for a normal program to reach here under race condition. |
| 68 | // Refer to the example described in addChild(). |
| 69 | grpclog.Infof("attempt to delete child with id %d from a parent (id=%d) that doesn't currently exist", id, d.idNotFound) |
| 70 | } |
| 71 | |
| 72 | func (d *dummyEntry) triggerDelete() { |
| 73 | grpclog.Warningf("attempt to delete an entry (id=%d) that doesn't currently exist", d.idNotFound) |
| 74 | } |
| 75 | |
| 76 | func (*dummyEntry) deleteSelfIfReady() { |
| 77 | // code should not reach here. deleteSelfIfReady is always called on an existing entry. |
| 78 | } |
| 79 | |
| 80 | func (*dummyEntry) getParentID() int64 { |
| 81 | return 0 |
| 82 | } |
| 83 | |
| 84 | // ChannelMetric defines the info channelz provides for a specific Channel, which |
| 85 | // includes ChannelInternalMetric and channelz-specific data, such as channelz id, |
| 86 | // child list, etc. |
| 87 | type ChannelMetric struct { |
| 88 | // ID is the channelz id of this channel. |
| 89 | ID int64 |
| 90 | // RefName is the human readable reference string of this channel. |
| 91 | RefName string |
| 92 | // ChannelData contains channel internal metric reported by the channel through |
| 93 | // ChannelzMetric(). |
| 94 | ChannelData *ChannelInternalMetric |
| 95 | // NestedChans tracks the nested channel type children of this channel in the format of |
| 96 | // a map from nested channel channelz id to corresponding reference string. |
| 97 | NestedChans map[int64]string |
| 98 | // SubChans tracks the subchannel type children of this channel in the format of a |
| 99 | // map from subchannel channelz id to corresponding reference string. |
| 100 | SubChans map[int64]string |
| 101 | // Sockets tracks the socket type children of this channel in the format of a map |
| 102 | // from socket channelz id to corresponding reference string. |
| 103 | // Note current grpc implementation doesn't allow channel having sockets directly, |
| 104 | // therefore, this is field is unused. |
| 105 | Sockets map[int64]string |
| 106 | // Trace contains the most recent traced events. |
| 107 | Trace *ChannelTrace |
| 108 | } |
| 109 | |
| 110 | // SubChannelMetric defines the info channelz provides for a specific SubChannel, |
| 111 | // which includes ChannelInternalMetric and channelz-specific data, such as |
| 112 | // channelz id, child list, etc. |
| 113 | type SubChannelMetric struct { |
| 114 | // ID is the channelz id of this subchannel. |
| 115 | ID int64 |
| 116 | // RefName is the human readable reference string of this subchannel. |
| 117 | RefName string |
| 118 | // ChannelData contains subchannel internal metric reported by the subchannel |
| 119 | // through ChannelzMetric(). |
| 120 | ChannelData *ChannelInternalMetric |
| 121 | // NestedChans tracks the nested channel type children of this subchannel in the format of |
| 122 | // a map from nested channel channelz id to corresponding reference string. |
| 123 | // Note current grpc implementation doesn't allow subchannel to have nested channels |
| 124 | // as children, therefore, this field is unused. |
| 125 | NestedChans map[int64]string |
| 126 | // SubChans tracks the subchannel type children of this subchannel in the format of a |
| 127 | // map from subchannel channelz id to corresponding reference string. |
| 128 | // Note current grpc implementation doesn't allow subchannel to have subchannels |
| 129 | // as children, therefore, this field is unused. |
| 130 | SubChans map[int64]string |
| 131 | // Sockets tracks the socket type children of this subchannel in the format of a map |
| 132 | // from socket channelz id to corresponding reference string. |
| 133 | Sockets map[int64]string |
| 134 | // Trace contains the most recent traced events. |
| 135 | Trace *ChannelTrace |
| 136 | } |
| 137 | |
| 138 | // ChannelInternalMetric defines the struct that the implementor of Channel interface |
| 139 | // should return from ChannelzMetric(). |
| 140 | type ChannelInternalMetric struct { |
| 141 | // current connectivity state of the channel. |
| 142 | State connectivity.State |
| 143 | // The target this channel originally tried to connect to. May be absent |
| 144 | Target string |
| 145 | // The number of calls started on the channel. |
| 146 | CallsStarted int64 |
| 147 | // The number of calls that have completed with an OK status. |
| 148 | CallsSucceeded int64 |
| 149 | // The number of calls that have a completed with a non-OK status. |
| 150 | CallsFailed int64 |
| 151 | // The last time a call was started on the channel. |
| 152 | LastCallStartedTimestamp time.Time |
| 153 | } |
| 154 | |
| 155 | // ChannelTrace stores traced events on a channel/subchannel and related info. |
| 156 | type ChannelTrace struct { |
| 157 | // EventNum is the number of events that ever got traced (i.e. including those that have been deleted) |
| 158 | EventNum int64 |
| 159 | // CreationTime is the creation time of the trace. |
| 160 | CreationTime time.Time |
| 161 | // Events stores the most recent trace events (up to $maxTraceEntry, newer event will overwrite the |
| 162 | // oldest one) |
| 163 | Events []*TraceEvent |
| 164 | } |
| 165 | |
| 166 | // TraceEvent represent a single trace event |
| 167 | type TraceEvent struct { |
| 168 | // Desc is a simple description of the trace event. |
| 169 | Desc string |
| 170 | // Severity states the severity of this trace event. |
| 171 | Severity Severity |
| 172 | // Timestamp is the event time. |
| 173 | Timestamp time.Time |
| 174 | // RefID is the id of the entity that gets referenced in the event. RefID is 0 if no other entity is |
| 175 | // involved in this event. |
| 176 | // e.g. SubChannel (id: 4[]) Created. --> RefID = 4, RefName = "" (inside []) |
| 177 | RefID int64 |
| 178 | // RefName is the reference name for the entity that gets referenced in the event. |
| 179 | RefName string |
| 180 | // RefType indicates the referenced entity type, i.e Channel or SubChannel. |
| 181 | RefType RefChannelType |
| 182 | } |
| 183 | |
| 184 | // Channel is the interface that should be satisfied in order to be tracked by |
| 185 | // channelz as Channel or SubChannel. |
| 186 | type Channel interface { |
| 187 | ChannelzMetric() *ChannelInternalMetric |
| 188 | } |
| 189 | |
| 190 | type dummyChannel struct{} |
| 191 | |
| 192 | func (d *dummyChannel) ChannelzMetric() *ChannelInternalMetric { |
| 193 | return &ChannelInternalMetric{} |
| 194 | } |
| 195 | |
| 196 | type channel struct { |
| 197 | refName string |
| 198 | c Channel |
| 199 | closeCalled bool |
| 200 | nestedChans map[int64]string |
| 201 | subChans map[int64]string |
| 202 | id int64 |
| 203 | pid int64 |
| 204 | cm *channelMap |
| 205 | trace *channelTrace |
| 206 | // traceRefCount is the number of trace events that reference this channel. |
| 207 | // Non-zero traceRefCount means the trace of this channel cannot be deleted. |
| 208 | traceRefCount int32 |
| 209 | } |
| 210 | |
| 211 | func (c *channel) addChild(id int64, e entry) { |
| 212 | switch v := e.(type) { |
| 213 | case *subChannel: |
| 214 | c.subChans[id] = v.refName |
| 215 | case *channel: |
| 216 | c.nestedChans[id] = v.refName |
| 217 | default: |
| 218 | grpclog.Errorf("cannot add a child (id = %d) of type %T to a channel", id, e) |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | func (c *channel) deleteChild(id int64) { |
| 223 | delete(c.subChans, id) |
| 224 | delete(c.nestedChans, id) |
| 225 | c.deleteSelfIfReady() |
| 226 | } |
| 227 | |
| 228 | func (c *channel) triggerDelete() { |
| 229 | c.closeCalled = true |
| 230 | c.deleteSelfIfReady() |
| 231 | } |
| 232 | |
| 233 | func (c *channel) getParentID() int64 { |
| 234 | return c.pid |
| 235 | } |
| 236 | |
| 237 | // deleteSelfFromTree tries to delete the channel from the channelz entry relation tree, which means |
| 238 | // deleting the channel reference from its parent's child list. |
| 239 | // |
| 240 | // In order for a channel to be deleted from the tree, it must meet the criteria that, removal of the |
| 241 | // corresponding grpc object has been invoked, and the channel does not have any children left. |
| 242 | // |
| 243 | // The returned boolean value indicates whether the channel has been successfully deleted from tree. |
| 244 | func (c *channel) deleteSelfFromTree() (deleted bool) { |
| 245 | if !c.closeCalled || len(c.subChans)+len(c.nestedChans) != 0 { |
| 246 | return false |
| 247 | } |
| 248 | // not top channel |
| 249 | if c.pid != 0 { |
| 250 | c.cm.findEntry(c.pid).deleteChild(c.id) |
| 251 | } |
| 252 | return true |
| 253 | } |
| 254 | |
| 255 | // deleteSelfFromMap checks whether it is valid to delete the channel from the map, which means |
| 256 | // deleting the channel from channelz's tracking entirely. Users can no longer use id to query the |
| 257 | // channel, and its memory will be garbage collected. |
| 258 | // |
| 259 | // The trace reference count of the channel must be 0 in order to be deleted from the map. This is |
| 260 | // specified in the channel tracing gRFC that as long as some other trace has reference to an entity, |
| 261 | // the trace of the referenced entity must not be deleted. In order to release the resource allocated |
| 262 | // by grpc, the reference to the grpc object is reset to a dummy object. |
| 263 | // |
| 264 | // deleteSelfFromMap must be called after deleteSelfFromTree returns true. |
| 265 | // |
| 266 | // It returns a bool to indicate whether the channel can be safely deleted from map. |
| 267 | func (c *channel) deleteSelfFromMap() (delete bool) { |
| 268 | if c.getTraceRefCount() != 0 { |
| 269 | c.c = &dummyChannel{} |
| 270 | return false |
| 271 | } |
| 272 | return true |
| 273 | } |
| 274 | |
| 275 | // deleteSelfIfReady tries to delete the channel itself from the channelz database. |
| 276 | // The delete process includes two steps: |
| 277 | // 1. delete the channel from the entry relation tree, i.e. delete the channel reference from its |
| 278 | // parent's child list. |
| 279 | // 2. delete the channel from the map, i.e. delete the channel entirely from channelz. Lookup by id |
| 280 | // will return entry not found error. |
| 281 | func (c *channel) deleteSelfIfReady() { |
| 282 | if !c.deleteSelfFromTree() { |
| 283 | return |
| 284 | } |
| 285 | if !c.deleteSelfFromMap() { |
| 286 | return |
| 287 | } |
| 288 | c.cm.deleteEntry(c.id) |
| 289 | c.trace.clear() |
| 290 | } |
| 291 | |
| 292 | func (c *channel) getChannelTrace() *channelTrace { |
| 293 | return c.trace |
| 294 | } |
| 295 | |
| 296 | func (c *channel) incrTraceRefCount() { |
| 297 | atomic.AddInt32(&c.traceRefCount, 1) |
| 298 | } |
| 299 | |
| 300 | func (c *channel) decrTraceRefCount() { |
| 301 | atomic.AddInt32(&c.traceRefCount, -1) |
| 302 | } |
| 303 | |
| 304 | func (c *channel) getTraceRefCount() int { |
| 305 | i := atomic.LoadInt32(&c.traceRefCount) |
| 306 | return int(i) |
| 307 | } |
| 308 | |
| 309 | func (c *channel) getRefName() string { |
| 310 | return c.refName |
| 311 | } |
| 312 | |
| 313 | type subChannel struct { |
| 314 | refName string |
| 315 | c Channel |
| 316 | closeCalled bool |
| 317 | sockets map[int64]string |
| 318 | id int64 |
| 319 | pid int64 |
| 320 | cm *channelMap |
| 321 | trace *channelTrace |
| 322 | traceRefCount int32 |
| 323 | } |
| 324 | |
| 325 | func (sc *subChannel) addChild(id int64, e entry) { |
| 326 | if v, ok := e.(*normalSocket); ok { |
| 327 | sc.sockets[id] = v.refName |
| 328 | } else { |
| 329 | grpclog.Errorf("cannot add a child (id = %d) of type %T to a subChannel", id, e) |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | func (sc *subChannel) deleteChild(id int64) { |
| 334 | delete(sc.sockets, id) |
| 335 | sc.deleteSelfIfReady() |
| 336 | } |
| 337 | |
| 338 | func (sc *subChannel) triggerDelete() { |
| 339 | sc.closeCalled = true |
| 340 | sc.deleteSelfIfReady() |
| 341 | } |
| 342 | |
| 343 | func (sc *subChannel) getParentID() int64 { |
| 344 | return sc.pid |
| 345 | } |
| 346 | |
| 347 | // deleteSelfFromTree tries to delete the subchannel from the channelz entry relation tree, which |
| 348 | // means deleting the subchannel reference from its parent's child list. |
| 349 | // |
| 350 | // In order for a subchannel to be deleted from the tree, it must meet the criteria that, removal of |
| 351 | // the corresponding grpc object has been invoked, and the subchannel does not have any children left. |
| 352 | // |
| 353 | // The returned boolean value indicates whether the channel has been successfully deleted from tree. |
| 354 | func (sc *subChannel) deleteSelfFromTree() (deleted bool) { |
| 355 | if !sc.closeCalled || len(sc.sockets) != 0 { |
| 356 | return false |
| 357 | } |
| 358 | sc.cm.findEntry(sc.pid).deleteChild(sc.id) |
| 359 | return true |
| 360 | } |
| 361 | |
| 362 | // deleteSelfFromMap checks whether it is valid to delete the subchannel from the map, which means |
| 363 | // deleting the subchannel from channelz's tracking entirely. Users can no longer use id to query |
| 364 | // the subchannel, and its memory will be garbage collected. |
| 365 | // |
| 366 | // The trace reference count of the subchannel must be 0 in order to be deleted from the map. This is |
| 367 | // specified in the channel tracing gRFC that as long as some other trace has reference to an entity, |
| 368 | // the trace of the referenced entity must not be deleted. In order to release the resource allocated |
| 369 | // by grpc, the reference to the grpc object is reset to a dummy object. |
| 370 | // |
| 371 | // deleteSelfFromMap must be called after deleteSelfFromTree returns true. |
| 372 | // |
| 373 | // It returns a bool to indicate whether the channel can be safely deleted from map. |
| 374 | func (sc *subChannel) deleteSelfFromMap() (delete bool) { |
| 375 | if sc.getTraceRefCount() != 0 { |
| 376 | // free the grpc struct (i.e. addrConn) |
| 377 | sc.c = &dummyChannel{} |
| 378 | return false |
| 379 | } |
| 380 | return true |
| 381 | } |
| 382 | |
| 383 | // deleteSelfIfReady tries to delete the subchannel itself from the channelz database. |
| 384 | // The delete process includes two steps: |
| 385 | // 1. delete the subchannel from the entry relation tree, i.e. delete the subchannel reference from |
| 386 | // its parent's child list. |
| 387 | // 2. delete the subchannel from the map, i.e. delete the subchannel entirely from channelz. Lookup |
| 388 | // by id will return entry not found error. |
| 389 | func (sc *subChannel) deleteSelfIfReady() { |
| 390 | if !sc.deleteSelfFromTree() { |
| 391 | return |
| 392 | } |
| 393 | if !sc.deleteSelfFromMap() { |
| 394 | return |
| 395 | } |
| 396 | sc.cm.deleteEntry(sc.id) |
| 397 | sc.trace.clear() |
| 398 | } |
| 399 | |
| 400 | func (sc *subChannel) getChannelTrace() *channelTrace { |
| 401 | return sc.trace |
| 402 | } |
| 403 | |
| 404 | func (sc *subChannel) incrTraceRefCount() { |
| 405 | atomic.AddInt32(&sc.traceRefCount, 1) |
| 406 | } |
| 407 | |
| 408 | func (sc *subChannel) decrTraceRefCount() { |
| 409 | atomic.AddInt32(&sc.traceRefCount, -1) |
| 410 | } |
| 411 | |
| 412 | func (sc *subChannel) getTraceRefCount() int { |
| 413 | i := atomic.LoadInt32(&sc.traceRefCount) |
| 414 | return int(i) |
| 415 | } |
| 416 | |
| 417 | func (sc *subChannel) getRefName() string { |
| 418 | return sc.refName |
| 419 | } |
| 420 | |
| 421 | // SocketMetric defines the info channelz provides for a specific Socket, which |
| 422 | // includes SocketInternalMetric and channelz-specific data, such as channelz id, etc. |
| 423 | type SocketMetric struct { |
| 424 | // ID is the channelz id of this socket. |
| 425 | ID int64 |
| 426 | // RefName is the human readable reference string of this socket. |
| 427 | RefName string |
| 428 | // SocketData contains socket internal metric reported by the socket through |
| 429 | // ChannelzMetric(). |
| 430 | SocketData *SocketInternalMetric |
| 431 | } |
| 432 | |
| 433 | // SocketInternalMetric defines the struct that the implementor of Socket interface |
| 434 | // should return from ChannelzMetric(). |
| 435 | type SocketInternalMetric struct { |
| 436 | // The number of streams that have been started. |
| 437 | StreamsStarted int64 |
| 438 | // The number of streams that have ended successfully: |
| 439 | // On client side, receiving frame with eos bit set. |
| 440 | // On server side, sending frame with eos bit set. |
| 441 | StreamsSucceeded int64 |
| 442 | // The number of streams that have ended unsuccessfully: |
| 443 | // On client side, termination without receiving frame with eos bit set. |
| 444 | // On server side, termination without sending frame with eos bit set. |
| 445 | StreamsFailed int64 |
| 446 | // The number of messages successfully sent on this socket. |
| 447 | MessagesSent int64 |
| 448 | MessagesReceived int64 |
| 449 | // The number of keep alives sent. This is typically implemented with HTTP/2 |
| 450 | // ping messages. |
| 451 | KeepAlivesSent int64 |
| 452 | // The last time a stream was created by this endpoint. Usually unset for |
| 453 | // servers. |
| 454 | LastLocalStreamCreatedTimestamp time.Time |
| 455 | // The last time a stream was created by the remote endpoint. Usually unset |
| 456 | // for clients. |
| 457 | LastRemoteStreamCreatedTimestamp time.Time |
| 458 | // The last time a message was sent by this endpoint. |
| 459 | LastMessageSentTimestamp time.Time |
| 460 | // The last time a message was received by this endpoint. |
| 461 | LastMessageReceivedTimestamp time.Time |
| 462 | // The amount of window, granted to the local endpoint by the remote endpoint. |
| 463 | // This may be slightly out of date due to network latency. This does NOT |
| 464 | // include stream level or TCP level flow control info. |
| 465 | LocalFlowControlWindow int64 |
| 466 | // The amount of window, granted to the remote endpoint by the local endpoint. |
| 467 | // This may be slightly out of date due to network latency. This does NOT |
| 468 | // include stream level or TCP level flow control info. |
| 469 | RemoteFlowControlWindow int64 |
| 470 | // The locally bound address. |
| 471 | LocalAddr net.Addr |
| 472 | // The remote bound address. May be absent. |
| 473 | RemoteAddr net.Addr |
| 474 | // Optional, represents the name of the remote endpoint, if different than |
| 475 | // the original target name. |
| 476 | RemoteName string |
| 477 | SocketOptions *SocketOptionData |
| 478 | Security credentials.ChannelzSecurityValue |
| 479 | } |
| 480 | |
| 481 | // Socket is the interface that should be satisfied in order to be tracked by |
| 482 | // channelz as Socket. |
| 483 | type Socket interface { |
| 484 | ChannelzMetric() *SocketInternalMetric |
| 485 | } |
| 486 | |
| 487 | type listenSocket struct { |
| 488 | refName string |
| 489 | s Socket |
| 490 | id int64 |
| 491 | pid int64 |
| 492 | cm *channelMap |
| 493 | } |
| 494 | |
| 495 | func (ls *listenSocket) addChild(id int64, e entry) { |
| 496 | grpclog.Errorf("cannot add a child (id = %d) of type %T to a listen socket", id, e) |
| 497 | } |
| 498 | |
| 499 | func (ls *listenSocket) deleteChild(id int64) { |
| 500 | grpclog.Errorf("cannot delete a child (id = %d) from a listen socket", id) |
| 501 | } |
| 502 | |
| 503 | func (ls *listenSocket) triggerDelete() { |
| 504 | ls.cm.deleteEntry(ls.id) |
| 505 | ls.cm.findEntry(ls.pid).deleteChild(ls.id) |
| 506 | } |
| 507 | |
| 508 | func (ls *listenSocket) deleteSelfIfReady() { |
| 509 | grpclog.Errorf("cannot call deleteSelfIfReady on a listen socket") |
| 510 | } |
| 511 | |
| 512 | func (ls *listenSocket) getParentID() int64 { |
| 513 | return ls.pid |
| 514 | } |
| 515 | |
| 516 | type normalSocket struct { |
| 517 | refName string |
| 518 | s Socket |
| 519 | id int64 |
| 520 | pid int64 |
| 521 | cm *channelMap |
| 522 | } |
| 523 | |
| 524 | func (ns *normalSocket) addChild(id int64, e entry) { |
| 525 | grpclog.Errorf("cannot add a child (id = %d) of type %T to a normal socket", id, e) |
| 526 | } |
| 527 | |
| 528 | func (ns *normalSocket) deleteChild(id int64) { |
| 529 | grpclog.Errorf("cannot delete a child (id = %d) from a normal socket", id) |
| 530 | } |
| 531 | |
| 532 | func (ns *normalSocket) triggerDelete() { |
| 533 | ns.cm.deleteEntry(ns.id) |
| 534 | ns.cm.findEntry(ns.pid).deleteChild(ns.id) |
| 535 | } |
| 536 | |
| 537 | func (ns *normalSocket) deleteSelfIfReady() { |
| 538 | grpclog.Errorf("cannot call deleteSelfIfReady on a normal socket") |
| 539 | } |
| 540 | |
| 541 | func (ns *normalSocket) getParentID() int64 { |
| 542 | return ns.pid |
| 543 | } |
| 544 | |
| 545 | // ServerMetric defines the info channelz provides for a specific Server, which |
| 546 | // includes ServerInternalMetric and channelz-specific data, such as channelz id, |
| 547 | // child list, etc. |
| 548 | type ServerMetric struct { |
| 549 | // ID is the channelz id of this server. |
| 550 | ID int64 |
| 551 | // RefName is the human readable reference string of this server. |
| 552 | RefName string |
| 553 | // ServerData contains server internal metric reported by the server through |
| 554 | // ChannelzMetric(). |
| 555 | ServerData *ServerInternalMetric |
| 556 | // ListenSockets tracks the listener socket type children of this server in the |
| 557 | // format of a map from socket channelz id to corresponding reference string. |
| 558 | ListenSockets map[int64]string |
| 559 | } |
| 560 | |
| 561 | // ServerInternalMetric defines the struct that the implementor of Server interface |
| 562 | // should return from ChannelzMetric(). |
| 563 | type ServerInternalMetric struct { |
| 564 | // The number of incoming calls started on the server. |
| 565 | CallsStarted int64 |
| 566 | // The number of incoming calls that have completed with an OK status. |
| 567 | CallsSucceeded int64 |
| 568 | // The number of incoming calls that have a completed with a non-OK status. |
| 569 | CallsFailed int64 |
| 570 | // The last time a call was started on the server. |
| 571 | LastCallStartedTimestamp time.Time |
| 572 | } |
| 573 | |
| 574 | // Server is the interface to be satisfied in order to be tracked by channelz as |
| 575 | // Server. |
| 576 | type Server interface { |
| 577 | ChannelzMetric() *ServerInternalMetric |
| 578 | } |
| 579 | |
| 580 | type server struct { |
| 581 | refName string |
| 582 | s Server |
| 583 | closeCalled bool |
| 584 | sockets map[int64]string |
| 585 | listenSockets map[int64]string |
| 586 | id int64 |
| 587 | cm *channelMap |
| 588 | } |
| 589 | |
| 590 | func (s *server) addChild(id int64, e entry) { |
| 591 | switch v := e.(type) { |
| 592 | case *normalSocket: |
| 593 | s.sockets[id] = v.refName |
| 594 | case *listenSocket: |
| 595 | s.listenSockets[id] = v.refName |
| 596 | default: |
| 597 | grpclog.Errorf("cannot add a child (id = %d) of type %T to a server", id, e) |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | func (s *server) deleteChild(id int64) { |
| 602 | delete(s.sockets, id) |
| 603 | delete(s.listenSockets, id) |
| 604 | s.deleteSelfIfReady() |
| 605 | } |
| 606 | |
| 607 | func (s *server) triggerDelete() { |
| 608 | s.closeCalled = true |
| 609 | s.deleteSelfIfReady() |
| 610 | } |
| 611 | |
| 612 | func (s *server) deleteSelfIfReady() { |
| 613 | if !s.closeCalled || len(s.sockets)+len(s.listenSockets) != 0 { |
| 614 | return |
| 615 | } |
| 616 | s.cm.deleteEntry(s.id) |
| 617 | } |
| 618 | |
| 619 | func (s *server) getParentID() int64 { |
| 620 | return 0 |
| 621 | } |
| 622 | |
| 623 | type tracedChannel interface { |
| 624 | getChannelTrace() *channelTrace |
| 625 | incrTraceRefCount() |
| 626 | decrTraceRefCount() |
| 627 | getRefName() string |
| 628 | } |
| 629 | |
| 630 | type channelTrace struct { |
| 631 | cm *channelMap |
| 632 | createdTime time.Time |
| 633 | eventCount int64 |
| 634 | mu sync.Mutex |
| 635 | events []*TraceEvent |
| 636 | } |
| 637 | |
| 638 | func (c *channelTrace) append(e *TraceEvent) { |
| 639 | c.mu.Lock() |
| 640 | if len(c.events) == getMaxTraceEntry() { |
| 641 | del := c.events[0] |
| 642 | c.events = c.events[1:] |
| 643 | if del.RefID != 0 { |
| 644 | // start recursive cleanup in a goroutine to not block the call originated from grpc. |
| 645 | go func() { |
| 646 | // need to acquire c.cm.mu lock to call the unlocked attemptCleanup func. |
| 647 | c.cm.mu.Lock() |
| 648 | c.cm.decrTraceRefCount(del.RefID) |
| 649 | c.cm.mu.Unlock() |
| 650 | }() |
| 651 | } |
| 652 | } |
| 653 | e.Timestamp = time.Now() |
| 654 | c.events = append(c.events, e) |
| 655 | c.eventCount++ |
| 656 | c.mu.Unlock() |
| 657 | } |
| 658 | |
| 659 | func (c *channelTrace) clear() { |
| 660 | c.mu.Lock() |
| 661 | for _, e := range c.events { |
| 662 | if e.RefID != 0 { |
| 663 | // caller should have already held the c.cm.mu lock. |
| 664 | c.cm.decrTraceRefCount(e.RefID) |
| 665 | } |
| 666 | } |
| 667 | c.mu.Unlock() |
| 668 | } |
| 669 | |
| 670 | // Severity is the severity level of a trace event. |
| 671 | // The canonical enumeration of all valid values is here: |
| 672 | // https://github.com/grpc/grpc-proto/blob/9b13d199cc0d4703c7ea26c9c330ba695866eb23/grpc/channelz/v1/channelz.proto#L126. |
| 673 | type Severity int |
| 674 | |
| 675 | const ( |
| 676 | // CtUNKNOWN indicates unknown severity of a trace event. |
| 677 | CtUNKNOWN Severity = iota |
| 678 | // CtINFO indicates info level severity of a trace event. |
| 679 | CtINFO |
| 680 | // CtWarning indicates warning level severity of a trace event. |
| 681 | CtWarning |
| 682 | // CtError indicates error level severity of a trace event. |
| 683 | CtError |
| 684 | ) |
| 685 | |
| 686 | // RefChannelType is the type of the entity being referenced in a trace event. |
| 687 | type RefChannelType int |
| 688 | |
| 689 | const ( |
| 690 | // RefChannel indicates the referenced entity is a Channel. |
| 691 | RefChannel RefChannelType = iota |
| 692 | // RefSubChannel indicates the referenced entity is a SubChannel. |
| 693 | RefSubChannel |
| 694 | ) |
| 695 | |
| 696 | func (c *channelTrace) dumpData() *ChannelTrace { |
| 697 | c.mu.Lock() |
| 698 | ct := &ChannelTrace{EventNum: c.eventCount, CreationTime: c.createdTime} |
| 699 | ct.Events = c.events[:len(c.events)] |
| 700 | c.mu.Unlock() |
| 701 | return ct |
| 702 | } |