1 files changed, 886 insertions, 0 deletions
diff --git a/frontend-old/node_modules/@grpc/grpc-js/src/channelz.ts b/frontend-old/node_modules/@grpc/grpc-js/src/channelz.ts
new file mode 100644
index 0000000..1e2627a
--- /dev/null
+++ b/frontend-old/node_modules/@grpc/grpc-js/src/channelz.ts
@@ -0,0 +1,886 @@
+/*
+ * Copyright 2021 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+import { isIPv4, isIPv6 } from 'net';
+import { ConnectivityState } from './connectivity-state';
+import { Status } from './constants';
+import { Timestamp } from './generated/google/protobuf/Timestamp';
+import { Channel as ChannelMessage } from './generated/grpc/channelz/v1/Channel';
+import { ChannelConnectivityState__Output } from './generated/grpc/channelz/v1/ChannelConnectivityState';
+import { ChannelRef as ChannelRefMessage } from './generated/grpc/channelz/v1/ChannelRef';
+import { ChannelTrace } from './generated/grpc/channelz/v1/ChannelTrace';
+import { GetChannelRequest__Output } from './generated/grpc/channelz/v1/GetChannelRequest';
+import { GetChannelResponse } from './generated/grpc/channelz/v1/GetChannelResponse';
+import { sendUnaryData, ServerUnaryCall } from './server-call';
+import { ServerRef as ServerRefMessage } from './generated/grpc/channelz/v1/ServerRef';
+import { SocketRef as SocketRefMessage } from './generated/grpc/channelz/v1/SocketRef';
+import {
+  isTcpSubchannelAddress,
+  SubchannelAddress,
+} from './subchannel-address';
+import { SubchannelRef as SubchannelRefMessage } from './generated/grpc/channelz/v1/SubchannelRef';
+import { GetServerRequest__Output } from './generated/grpc/channelz/v1/GetServerRequest';
+import { GetServerResponse } from './generated/grpc/channelz/v1/GetServerResponse';
+import { Server as ServerMessage } from './generated/grpc/channelz/v1/Server';
+import { GetServersRequest__Output } from './generated/grpc/channelz/v1/GetServersRequest';
+import { GetServersResponse } from './generated/grpc/channelz/v1/GetServersResponse';
+import { GetTopChannelsRequest__Output } from './generated/grpc/channelz/v1/GetTopChannelsRequest';
+import { GetTopChannelsResponse } from './generated/grpc/channelz/v1/GetTopChannelsResponse';
+import { GetSubchannelRequest__Output } from './generated/grpc/channelz/v1/GetSubchannelRequest';
+import { GetSubchannelResponse } from './generated/grpc/channelz/v1/GetSubchannelResponse';
+import { Subchannel as SubchannelMessage } from './generated/grpc/channelz/v1/Subchannel';
+import { GetSocketRequest__Output } from './generated/grpc/channelz/v1/GetSocketRequest';
+import { GetSocketResponse } from './generated/grpc/channelz/v1/GetSocketResponse';
+import { Socket as SocketMessage } from './generated/grpc/channelz/v1/Socket';
+import { Address } from './generated/grpc/channelz/v1/Address';
+import { Security } from './generated/grpc/channelz/v1/Security';
+import { GetServerSocketsRequest__Output } from './generated/grpc/channelz/v1/GetServerSocketsRequest';
+import { GetServerSocketsResponse } from './generated/grpc/channelz/v1/GetServerSocketsResponse';
+import {
+  ChannelzDefinition,
+  ChannelzHandlers,
+} from './generated/grpc/channelz/v1/Channelz';
+import { ProtoGrpcType as ChannelzProtoGrpcType } from './generated/channelz';
+import type { loadSync } from '@grpc/proto-loader';
+import { registerAdminService } from './admin';
+import { loadPackageDefinition } from './make-client';
+
+export type TraceSeverity =
+  | 'CT_UNKNOWN'
+  | 'CT_INFO'
+  | 'CT_WARNING'
+  | 'CT_ERROR';
+
+export interface ChannelRef {
+  kind: 'channel';
+  id: number;
+  name: string;
+}
+
+export interface SubchannelRef {
+  kind: 'subchannel';
+  id: number;
+  name: string;
+}
+
+export interface ServerRef {
+  kind: 'server';
+  id: number;
+}
+
+export interface SocketRef {
+  kind: 'socket';
+  id: number;
+  name: string;
+}
+
+function channelRefToMessage(ref: ChannelRef): ChannelRefMessage {
+  return {
+    channel_id: ref.id,
+    name: ref.name,
+  };
+}
+
+function subchannelRefToMessage(ref: SubchannelRef): SubchannelRefMessage {
+  return {
+    subchannel_id: ref.id,
+    name: ref.name,
+  };
+}
+
+function serverRefToMessage(ref: ServerRef): ServerRefMessage {
+  return {
+    server_id: ref.id,
+  };
+}
+
+function socketRefToMessage(ref: SocketRef): SocketRefMessage {
+  return {
+    socket_id: ref.id,
+    name: ref.name,
+  };
+}
+
+interface TraceEvent {
+  description: string;
+  severity: TraceSeverity;
+  timestamp: Date;
+  childChannel?: ChannelRef;
+  childSubchannel?: SubchannelRef;
+}
+
+/**
+ * The loose upper bound on the number of events that should be retained in a
+ * trace. This may be exceeded by up to a factor of 2. Arbitrarily chosen as a
+ * number that should be large enough to contain the recent relevant
+ * information, but small enough to not use excessive memory.
+ */
+const TARGET_RETAINED_TRACES = 32;
+
+export class ChannelzTrace {
+  events: TraceEvent[] = [];
+  creationTimestamp: Date;
+  eventsLogged = 0;
+
+  constructor() {
+    this.creationTimestamp = new Date();
+  }
+
+  addTrace(
+    severity: TraceSeverity,
+    description: string,
+    child?: ChannelRef | SubchannelRef
+  ) {
+    const timestamp = new Date();
+    this.events.push({
+      description: description,
+      severity: severity,
+      timestamp: timestamp,
+      childChannel: child?.kind === 'channel' ? child : undefined,
+      childSubchannel: child?.kind === 'subchannel' ? child : undefined,
+    });
+    // Whenever the trace array gets too large, discard the first half
+    if (this.events.length >= TARGET_RETAINED_TRACES * 2) {
+      this.events = this.events.slice(TARGET_RETAINED_TRACES);
+    }
+    this.eventsLogged += 1;
+  }
+
+  getTraceMessage(): ChannelTrace {
+    return {
+      creation_timestamp: dateToProtoTimestamp(this.creationTimestamp),
+      num_events_logged: this.eventsLogged,
+      events: this.events.map(event => {
+        return {
+          description: event.description,
+          severity: event.severity,
+          timestamp: dateToProtoTimestamp(event.timestamp),
+          channel_ref: event.childChannel
+            ? channelRefToMessage(event.childChannel)
+            : null,
+          subchannel_ref: event.childSubchannel
+            ? subchannelRefToMessage(event.childSubchannel)
+            : null,
+        };
+      }),
+    };
+  }
+}
+
+export class ChannelzChildrenTracker {
+  private channelChildren: Map<number, { ref: ChannelRef; count: number }> =
+    new Map<number, { ref: ChannelRef; count: number }>();
+  private subchannelChildren: Map<
+    number,
+    { ref: SubchannelRef; count: number }
+  > = new Map<number, { ref: SubchannelRef; count: number }>();
+  private socketChildren: Map<number, { ref: SocketRef; count: number }> =
+    new Map<number, { ref: SocketRef; count: number }>();
+
+  refChild(child: ChannelRef | SubchannelRef | SocketRef) {
+    switch (child.kind) {
+      case 'channel': {
+        const trackedChild = this.channelChildren.get(child.id) ?? {
+          ref: child,
+          count: 0,
+        };
+        trackedChild.count += 1;
+        this.channelChildren.set(child.id, trackedChild);
+        break;
+      }
+      case 'subchannel': {
+        const trackedChild = this.subchannelChildren.get(child.id) ?? {
+          ref: child,
+          count: 0,
+        };
+        trackedChild.count += 1;
+        this.subchannelChildren.set(child.id, trackedChild);
+        break;
+      }
+      case 'socket': {
+        const trackedChild = this.socketChildren.get(child.id) ?? {
+          ref: child,
+          count: 0,
+        };
+        trackedChild.count += 1;
+        this.socketChildren.set(child.id, trackedChild);
+        break;
+      }
+    }
+  }
+
+  unrefChild(child: ChannelRef | SubchannelRef | SocketRef) {
+    switch (child.kind) {
+      case 'channel': {
+        const trackedChild = this.channelChildren.get(child.id);
+        if (trackedChild !== undefined) {
+          trackedChild.count -= 1;
+          if (trackedChild.count === 0) {
+            this.channelChildren.delete(child.id);
+          } else {
+            this.channelChildren.set(child.id, trackedChild);
+          }
+        }
+        break;
+      }
+      case 'subchannel': {
+        const trackedChild = this.subchannelChildren.get(child.id);
+        if (trackedChild !== undefined) {
+          trackedChild.count -= 1;
+          if (trackedChild.count === 0) {
+            this.subchannelChildren.delete(child.id);
+          } else {
+            this.subchannelChildren.set(child.id, trackedChild);
+          }
+        }
+        break;
+      }
+      case 'socket': {
+        const trackedChild = this.socketChildren.get(child.id);
+        if (trackedChild !== undefined) {
+          trackedChild.count -= 1;
+          if (trackedChild.count === 0) {
+            this.socketChildren.delete(child.id);
+          } else {
+            this.socketChildren.set(child.id, trackedChild);
+          }
+        }
+        break;
+      }
+    }
+  }
+
+  getChildLists(): ChannelzChildren {
+    const channels: ChannelRef[] = [];
+    for (const { ref } of this.channelChildren.values()) {
+      channels.push(ref);
+    }
+    const subchannels: SubchannelRef[] = [];
+    for (const { ref } of this.subchannelChildren.values()) {
+      subchannels.push(ref);
+    }
+    const sockets: SocketRef[] = [];
+    for (const { ref } of this.socketChildren.values()) {
+      sockets.push(ref);
+    }
+    return { channels, subchannels, sockets };
+  }
+}
+
+export class ChannelzCallTracker {
+  callsStarted = 0;
+  callsSucceeded = 0;
+  callsFailed = 0;
+  lastCallStartedTimestamp: Date | null = null;
+
+  addCallStarted() {
+    this.callsStarted += 1;
+    this.lastCallStartedTimestamp = new Date();
+  }
+  addCallSucceeded() {
+    this.callsSucceeded += 1;
+  }
+  addCallFailed() {
+    this.callsFailed += 1;
+  }
+}
+
+export interface ChannelzChildren {
+  channels: ChannelRef[];
+  subchannels: SubchannelRef[];
+  sockets: SocketRef[];
+}
+
+export interface ChannelInfo {
+  target: string;
+  state: ConnectivityState;
+  trace: ChannelzTrace;
+  callTracker: ChannelzCallTracker;
+  children: ChannelzChildren;
+}
+
+export type SubchannelInfo = ChannelInfo;
+
+export interface ServerInfo {
+  trace: ChannelzTrace;
+  callTracker: ChannelzCallTracker;
+  listenerChildren: ChannelzChildren;
+  sessionChildren: ChannelzChildren;
+}
+
+export interface TlsInfo {
+  cipherSuiteStandardName: string | null;
+  cipherSuiteOtherName: string | null;
+  localCertificate: Buffer | null;
+  remoteCertificate: Buffer | null;
+}
+
+export interface SocketInfo {
+  localAddress: SubchannelAddress | null;
+  remoteAddress: SubchannelAddress | null;
+  security: TlsInfo | null;
+  remoteName: string | null;
+  streamsStarted: number;
+  streamsSucceeded: number;
+  streamsFailed: number;
+  messagesSent: number;
+  messagesReceived: number;
+  keepAlivesSent: number;
+  lastLocalStreamCreatedTimestamp: Date | null;
+  lastRemoteStreamCreatedTimestamp: Date | null;
+  lastMessageSentTimestamp: Date | null;
+  lastMessageReceivedTimestamp: Date | null;
+  localFlowControlWindow: number | null;
+  remoteFlowControlWindow: number | null;
+}
+
+interface ChannelEntry {
+  ref: ChannelRef;
+  getInfo(): ChannelInfo;
+}
+
+interface SubchannelEntry {
+  ref: SubchannelRef;
+  getInfo(): SubchannelInfo;
+}
+
+interface ServerEntry {
+  ref: ServerRef;
+  getInfo(): ServerInfo;
+}
+
+interface SocketEntry {
+  ref: SocketRef;
+  getInfo(): SocketInfo;
+}
+
+let nextId = 1;
+
+function getNextId(): number {
+  return nextId++;
+}
+
+const channels: (ChannelEntry | undefined)[] = [];
+const subchannels: (SubchannelEntry | undefined)[] = [];
+const servers: (ServerEntry | undefined)[] = [];
+const sockets: (SocketEntry | undefined)[] = [];
+
+export function registerChannelzChannel(
+  name: string,
+  getInfo: () => ChannelInfo,
+  channelzEnabled: boolean
+): ChannelRef {
+  const id = getNextId();
+  const ref: ChannelRef = { id, name, kind: 'channel' };
+  if (channelzEnabled) {
+    channels[id] = { ref, getInfo };
+  }
+  return ref;
+}
+
+export function registerChannelzSubchannel(
+  name: string,
+  getInfo: () => SubchannelInfo,
+  channelzEnabled: boolean
+): SubchannelRef {
+  const id = getNextId();
+  const ref: SubchannelRef = { id, name, kind: 'subchannel' };
+  if (channelzEnabled) {
+    subchannels[id] = { ref, getInfo };
+  }
+  return ref;
+}
+
+export function registerChannelzServer(
+  getInfo: () => ServerInfo,
+  channelzEnabled: boolean
+): ServerRef {
+  const id = getNextId();
+  const ref: ServerRef = { id, kind: 'server' };
+  if (channelzEnabled) {
+    servers[id] = { ref, getInfo };
+  }
+  return ref;
+}
+
+export function registerChannelzSocket(
+  name: string,
+  getInfo: () => SocketInfo,
+  channelzEnabled: boolean
+): SocketRef {
+  const id = getNextId();
+  const ref: SocketRef = { id, name, kind: 'socket' };
+  if (channelzEnabled) {
+    sockets[id] = { ref, getInfo };
+  }
+  return ref;
+}
+
+export function unregisterChannelzRef(
+  ref: ChannelRef | SubchannelRef | ServerRef | SocketRef
+) {
+  switch (ref.kind) {
+    case 'channel':
+      delete channels[ref.id];
+      return;
+    case 'subchannel':
+      delete subchannels[ref.id];
+      return;
+    case 'server':
+      delete servers[ref.id];
+      return;
+    case 'socket':
+      delete sockets[ref.id];
+      return;
+  }
+}
+
+/**
+ * Parse a single section of an IPv6 address as two bytes
+ * @param addressSection A hexadecimal string of length up to 4
+ * @returns The pair of bytes representing this address section
+ */
+function parseIPv6Section(addressSection: string): [number, number] {
+  const numberValue = Number.parseInt(addressSection, 16);
+  return [(numberValue / 256) | 0, numberValue % 256];
+}
+
+/**
+ * Parse a chunk of an IPv6 address string to some number of bytes
+ * @param addressChunk Some number of segments of up to 4 hexadecimal
+ *   characters each, joined by colons.
+ * @returns The list of bytes representing this address chunk
+ */
+function parseIPv6Chunk(addressChunk: string): number[] {
+  if (addressChunk === '') {
+    return [];
+  }
+  const bytePairs = addressChunk
+    .split(':')
+    .map(section => parseIPv6Section(section));
+  const result: number[] = [];
+  return result.concat(...bytePairs);
+}
+
+/**
+ * Converts an IPv4 or IPv6 address from string representation to binary
+ * representation
+ * @param ipAddress an IP address in standard IPv4 or IPv6 text format
+ * @returns
+ */
+function ipAddressStringToBuffer(ipAddress: string): Buffer | null {
+  if (isIPv4(ipAddress)) {
+    return Buffer.from(
+      Uint8Array.from(
+        ipAddress.split('.').map(segment => Number.parseInt(segment))
+      )
+    );
+  } else if (isIPv6(ipAddress)) {
+    let leftSection: string;
+    let rightSection: string;
+    const doubleColonIndex = ipAddress.indexOf('::');
+    if (doubleColonIndex === -1) {
+      leftSection = ipAddress;
+      rightSection = '';
+    } else {
+      leftSection = ipAddress.substring(0, doubleColonIndex);
+      rightSection = ipAddress.substring(doubleColonIndex + 2);
+    }
+    const leftBuffer = Buffer.from(parseIPv6Chunk(leftSection));
+    const rightBuffer = Buffer.from(parseIPv6Chunk(rightSection));
+    const middleBuffer = Buffer.alloc(
+      16 - leftBuffer.length - rightBuffer.length,
+      0
+    );
+    return Buffer.concat([leftBuffer, middleBuffer, rightBuffer]);
+  } else {
+    return null;
+  }
+}
+
+function connectivityStateToMessage(
+  state: ConnectivityState
+): ChannelConnectivityState__Output {
+  switch (state) {
+    case ConnectivityState.CONNECTING:
+      return {
+        state: 'CONNECTING',
+      };
+    case ConnectivityState.IDLE:
+      return {
+        state: 'IDLE',
+      };
+    case ConnectivityState.READY:
+      return {
+        state: 'READY',
+      };
+    case ConnectivityState.SHUTDOWN:
+      return {
+        state: 'SHUTDOWN',
+      };
+    case ConnectivityState.TRANSIENT_FAILURE:
+      return {
+        state: 'TRANSIENT_FAILURE',
+      };
+    default:
+      return {
+        state: 'UNKNOWN',
+      };
+  }
+}
+
+function dateToProtoTimestamp(date?: Date | null): Timestamp | null {
+  if (!date) {
+    return null;
+  }
+  const millisSinceEpoch = date.getTime();
+  return {
+    seconds: (millisSinceEpoch / 1000) | 0,
+    nanos: (millisSinceEpoch % 1000) * 1_000_000,
+  };
+}
+
+function getChannelMessage(channelEntry: ChannelEntry): ChannelMessage {
+  const resolvedInfo = channelEntry.getInfo();
+  return {
+    ref: channelRefToMessage(channelEntry.ref),
+    data: {
+      target: resolvedInfo.target,
+      state: connectivityStateToMessage(resolvedInfo.state),
+      calls_started: resolvedInfo.callTracker.callsStarted,
+      calls_succeeded: resolvedInfo.callTracker.callsSucceeded,
+      calls_failed: resolvedInfo.callTracker.callsFailed,
+      last_call_started_timestamp: dateToProtoTimestamp(
+        resolvedInfo.callTracker.lastCallStartedTimestamp
+      ),
+      trace: resolvedInfo.trace.getTraceMessage(),
+    },
+    channel_ref: resolvedInfo.children.channels.map(ref =>
+      channelRefToMessage(ref)
+    ),
+    subchannel_ref: resolvedInfo.children.subchannels.map(ref =>
+      subchannelRefToMessage(ref)
+    ),
+  };
+}
+
+function GetChannel(
+  call: ServerUnaryCall<GetChannelRequest__Output, GetChannelResponse>,
+  callback: sendUnaryData<GetChannelResponse>
+): void {
+  const channelId = Number.parseInt(call.request.channel_id);
+  const channelEntry = channels[channelId];
+  if (channelEntry === undefined) {
+    callback({
+      code: Status.NOT_FOUND,
+      details: 'No channel data found for id ' + channelId,
+    });
+    return;
+  }
+  callback(null, { channel: getChannelMessage(channelEntry) });
+}
+
+function GetTopChannels(
+  call: ServerUnaryCall<GetTopChannelsRequest__Output, GetTopChannelsResponse>,
+  callback: sendUnaryData<GetTopChannelsResponse>
+): void {
+  const maxResults = Number.parseInt(call.request.max_results);
+  const resultList: ChannelMessage[] = [];
+  let i = Number.parseInt(call.request.start_channel_id);
+  for (; i < channels.length; i++) {
+    const channelEntry = channels[i];
+    if (channelEntry === undefined) {
+      continue;
+    }
+    resultList.push(getChannelMessage(channelEntry));
+    if (resultList.length >= maxResults) {
+      break;
+    }
+  }
+  callback(null, {
+    channel: resultList,
+    end: i >= servers.length,
+  });
+}
+
+function getServerMessage(serverEntry: ServerEntry): ServerMessage {
+  const resolvedInfo = serverEntry.getInfo();
+  return {
+    ref: serverRefToMessage(serverEntry.ref),
+    data: {
+      calls_started: resolvedInfo.callTracker.callsStarted,
+      calls_succeeded: resolvedInfo.callTracker.callsSucceeded,
+      calls_failed: resolvedInfo.callTracker.callsFailed,
+      last_call_started_timestamp: dateToProtoTimestamp(
+        resolvedInfo.callTracker.lastCallStartedTimestamp
+      ),
+      trace: resolvedInfo.trace.getTraceMessage(),
+    },
+    listen_socket: resolvedInfo.listenerChildren.sockets.map(ref =>
+      socketRefToMessage(ref)
+    ),
+  };
+}
+
+function GetServer(
+  call: ServerUnaryCall<GetServerRequest__Output, GetServerResponse>,
+  callback: sendUnaryData<GetServerResponse>
+): void {
+  const serverId = Number.parseInt(call.request.server_id);
+  const serverEntry = servers[serverId];
+  if (serverEntry === undefined) {
+    callback({
+      code: Status.NOT_FOUND,
+      details: 'No server data found for id ' + serverId,
+    });
+    return;
+  }
+  callback(null, { server: getServerMessage(serverEntry) });
+}
+
+function GetServers(
+  call: ServerUnaryCall<GetServersRequest__Output, GetServersResponse>,
+  callback: sendUnaryData<GetServersResponse>
+): void {
+  const maxResults = Number.parseInt(call.request.max_results);
+  const resultList: ServerMessage[] = [];
+  let i = Number.parseInt(call.request.start_server_id);
+  for (; i < servers.length; i++) {
+    const serverEntry = servers[i];
+    if (serverEntry === undefined) {
+      continue;
+    }
+    resultList.push(getServerMessage(serverEntry));
+    if (resultList.length >= maxResults) {
+      break;
+    }
+  }
+  callback(null, {
+    server: resultList,
+    end: i >= servers.length,
+  });
+}
+
+function GetSubchannel(
+  call: ServerUnaryCall<GetSubchannelRequest__Output, GetSubchannelResponse>,
+  callback: sendUnaryData<GetSubchannelResponse>
+): void {
+  const subchannelId = Number.parseInt(call.request.subchannel_id);
+  const subchannelEntry = subchannels[subchannelId];
+  if (subchannelEntry === undefined) {
+    callback({
+      code: Status.NOT_FOUND,
+      details: 'No subchannel data found for id ' + subchannelId,
+    });
+    return;
+  }
+  const resolvedInfo = subchannelEntry.getInfo();
+  const subchannelMessage: SubchannelMessage = {
+    ref: subchannelRefToMessage(subchannelEntry.ref),
+    data: {
+      target: resolvedInfo.target,
+      state: connectivityStateToMessage(resolvedInfo.state),
+      calls_started: resolvedInfo.callTracker.callsStarted,
+      calls_succeeded: resolvedInfo.callTracker.callsSucceeded,
+      calls_failed: resolvedInfo.callTracker.callsFailed,
+      last_call_started_timestamp: dateToProtoTimestamp(
+        resolvedInfo.callTracker.lastCallStartedTimestamp
+      ),
+      trace: resolvedInfo.trace.getTraceMessage(),
+    },
+    socket_ref: resolvedInfo.children.sockets.map(ref =>
+      socketRefToMessage(ref)
+    ),
+  };
+  callback(null, { subchannel: subchannelMessage });
+}
+
+function subchannelAddressToAddressMessage(
+  subchannelAddress: SubchannelAddress
+): Address {
+  if (isTcpSubchannelAddress(subchannelAddress)) {
+    return {
+      address: 'tcpip_address',
+      tcpip_address: {
+        ip_address:
+          ipAddressStringToBuffer(subchannelAddress.host) ?? undefined,
+        port: subchannelAddress.port,
+      },
+    };
+  } else {
+    return {
+      address: 'uds_address',
+      uds_address: {
+        filename: subchannelAddress.path,
+      },
+    };
+  }
+}
+
+function GetSocket(
+  call: ServerUnaryCall<GetSocketRequest__Output, GetSocketResponse>,
+  callback: sendUnaryData<GetSocketResponse>
+): void {
+  const socketId = Number.parseInt(call.request.socket_id);
+  const socketEntry = sockets[socketId];
+  if (socketEntry === undefined) {
+    callback({
+      code: Status.NOT_FOUND,
+      details: 'No socket data found for id ' + socketId,
+    });
+    return;
+  }
+  const resolvedInfo = socketEntry.getInfo();
+  const securityMessage: Security | null = resolvedInfo.security
+    ? {
+        model: 'tls',
+        tls: {
+          cipher_suite: resolvedInfo.security.cipherSuiteStandardName
+            ? 'standard_name'
+            : 'other_name',
+          standard_name:
+            resolvedInfo.security.cipherSuiteStandardName ?? undefined,
+          other_name: resolvedInfo.security.cipherSuiteOtherName ?? undefined,
+          local_certificate:
+            resolvedInfo.security.localCertificate ?? undefined,
+          remote_certificate:
+            resolvedInfo.security.remoteCertificate ?? undefined,
+        },
+      }
+    : null;
+  const socketMessage: SocketMessage = {
+    ref: socketRefToMessage(socketEntry.ref),
+    local: resolvedInfo.localAddress
+      ? subchannelAddressToAddressMessage(resolvedInfo.localAddress)
+      : null,
+    remote: resolvedInfo.remoteAddress
+      ? subchannelAddressToAddressMessage(resolvedInfo.remoteAddress)
+      : null,
+    remote_name: resolvedInfo.remoteName ?? undefined,
+    security: securityMessage,
+    data: {
+      keep_alives_sent: resolvedInfo.keepAlivesSent,
+      streams_started: resolvedInfo.streamsStarted,
+      streams_succeeded: resolvedInfo.streamsSucceeded,
+      streams_failed: resolvedInfo.streamsFailed,
+      last_local_stream_created_timestamp: dateToProtoTimestamp(
+        resolvedInfo.lastLocalStreamCreatedTimestamp
+      ),
+      last_remote_stream_created_timestamp: dateToProtoTimestamp(
+        resolvedInfo.lastRemoteStreamCreatedTimestamp
+      ),
+      messages_received: resolvedInfo.messagesReceived,
+      messages_sent: resolvedInfo.messagesSent,
+      last_message_received_timestamp: dateToProtoTimestamp(
+        resolvedInfo.lastMessageReceivedTimestamp
+      ),
+      last_message_sent_timestamp: dateToProtoTimestamp(
+        resolvedInfo.lastMessageSentTimestamp
+      ),
+      local_flow_control_window: resolvedInfo.localFlowControlWindow
+        ? { value: resolvedInfo.localFlowControlWindow }
+        : null,
+      remote_flow_control_window: resolvedInfo.remoteFlowControlWindow
+        ? { value: resolvedInfo.remoteFlowControlWindow }
+        : null,
+    },
+  };
+  callback(null, { socket: socketMessage });
+}
+
+function GetServerSockets(
+  call: ServerUnaryCall<
+    GetServerSocketsRequest__Output,
+    GetServerSocketsResponse
+  >,
+  callback: sendUnaryData<GetServerSocketsResponse>
+): void {
+  const serverId = Number.parseInt(call.request.server_id);
+  const serverEntry = servers[serverId];
+  if (serverEntry === undefined) {
+    callback({
+      code: Status.NOT_FOUND,
+      details: 'No server data found for id ' + serverId,
+    });
+    return;
+  }
+  const startId = Number.parseInt(call.request.start_socket_id);
+  const maxResults = Number.parseInt(call.request.max_results);
+  const resolvedInfo = serverEntry.getInfo();
+  // If we wanted to include listener sockets in the result, this line would
+  // instead say
+  // const allSockets = resolvedInfo.listenerChildren.sockets.concat(resolvedInfo.sessionChildren.sockets).sort((ref1, ref2) => ref1.id - ref2.id);
+  const allSockets = resolvedInfo.sessionChildren.sockets.sort(
+    (ref1, ref2) => ref1.id - ref2.id
+  );
+  const resultList: SocketRefMessage[] = [];
+  let i = 0;
+  for (; i < allSockets.length; i++) {
+    if (allSockets[i].id >= startId) {
+      resultList.push(socketRefToMessage(allSockets[i]));
+      if (resultList.length >= maxResults) {
+        break;
+      }
+    }
+  }
+  callback(null, {
+    socket_ref: resultList,
+    end: i >= allSockets.length,
+  });
+}
+
+export function getChannelzHandlers(): ChannelzHandlers {
+  return {
+    GetChannel,
+    GetTopChannels,
+    GetServer,
+    GetServers,
+    GetSubchannel,
+    GetSocket,
+    GetServerSockets,
+  };
+}
+
+let loadedChannelzDefinition: ChannelzDefinition | null = null;
+
+export function getChannelzServiceDefinition(): ChannelzDefinition {
+  if (loadedChannelzDefinition) {
+    return loadedChannelzDefinition;
+  }
+  /* The purpose of this complexity is to avoid loading @grpc/proto-loader at
+   * runtime for users who will not use/enable channelz. */
+  const loaderLoadSync = require('@grpc/proto-loader')
+    .loadSync as typeof loadSync;
+  const loadedProto = loaderLoadSync('channelz.proto', {
+    keepCase: true,
+    longs: String,
+    enums: String,
+    defaults: true,
+    oneofs: true,
+    includeDirs: [`${__dirname}/../../proto`],
+  });
+  const channelzGrpcObject = loadPackageDefinition(
+    loadedProto
+  ) as unknown as ChannelzProtoGrpcType;
+  loadedChannelzDefinition =
+    channelzGrpcObject.grpc.channelz.v1.Channelz.service;
+  return loadedChannelzDefinition;
+}
+
+export function setup() {
+  registerAdminService(getChannelzServiceDefinition, getChannelzHandlers);
+}