feat(NODE-3424): use hello for monitoring commands

.evergreen/install-dependencies.sh

@@ -3,7 +3,7 @@
 set -o errexit  # Exit the script with error if any of the commands fail
 
 NVM_WINDOWS_URL="https://github.com/coreybutler/nvm-windows/releases/download/1.1.7/nvm-noinstall.zip"
-NVM_URL="https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh"
+NVM_URL="https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh"
 
 NODE_LTS_NAME=${NODE_LTS_NAME:-carbon}
 MSVS_VERSION=${MSVS_VERSION:-2017}

lib/cmap/connection_pool.js

@@ -158,12 +158,13 @@ class ConnectionPool extends EventEmitter {
       waitQueueTimeoutMS:
         typeof options.waitQueueTimeoutMS === 'number' ? options.waitQueueTimeoutMS : 0,
       autoEncrypter: options.autoEncrypter,
-      metadata: options.metadata
+      metadata: options.metadata,
+      useUnifiedTopology: options.useUnifiedTopology
     });
 
     if (options.minSize > options.maxSize) {
       throw new TypeError(
-        'Connection pool minimum size must not be greater than maxiumum pool size'
+        'Connection pool minimum size must not be greater than maximum pool size'
       );
     }
 

lib/core/connection/connect.js

@@ -95,6 +95,8 @@ function performInitialHandshake(conn, options, _callback) {
       handshakeOptions.socketTimeout = options.connectTimeoutMS || options.connectionTimeout;
     }
 
+    handshakeDoc.helloOk = !!options.useUnifiedTopology;
+
     const start = new Date().getTime();
     conn.command('admin.$cmd', handshakeDoc, handshakeOptions, (err, result) => {
       if (err) {
@@ -113,6 +115,10 @@ function performInitialHandshake(conn, options, _callback) {
         response.ismaster = response.isWritablePrimary;
       }
 
+      if (options.useUnifiedTopology && response.helloOk) {
+        conn.helloOk = true;
+      }
+
       const supportedServerErr = checkSupportedServer(response, options);
       if (supportedServerErr) {
         callback(supportedServerErr);
@@ -272,12 +278,17 @@ function makeConnection(family, options, cancellationToken, _callback) {
       : typeof options.connectTimeoutMS === 'number'
       ? options.connectTimeoutMS
       : 30000;
-  const socketTimeout = typeof options.socketTimeout === 'number' ? options.socketTimeout : 0;
+  const socketTimeoutMS =
+    typeof options.socketTimeoutMS === 'number'
+      ? options.socketTimeoutMS
+      : typeof options.socketTimeout === 'number'
+      ? options.socketTimeout
+      : 0;
   const rejectUnauthorized =
     typeof options.rejectUnauthorized === 'boolean' ? options.rejectUnauthorized : true;
 
-  if (keepAliveInitialDelay > socketTimeout) {
-    keepAliveInitialDelay = Math.round(socketTimeout / 2);
+  if (keepAliveInitialDelay > socketTimeoutMS) {
+    keepAliveInitialDelay = Math.round(socketTimeoutMS / 2);
   }
 
   let socket;
@@ -330,7 +341,7 @@ function makeConnection(family, options, cancellationToken, _callback) {
       return callback(socket.authorizationError);
     }
 
-    socket.setTimeout(socketTimeout);
+    socket.setTimeout(socketTimeoutMS);
     callback(null, socket);
   }
 

lib/core/connection/connection.js

@@ -91,6 +91,7 @@ class Connection extends EventEmitter {
     this.bson = options.bson;
     this.tag = options.tag;
     this.maxBsonMessageSize = options.maxBsonMessageSize || DEFAULT_MAX_BSON_MESSAGE_SIZE;
+    this.helloOk = undefined;
 
     this.port = options.port || 27017;
     this.host = options.host || 'localhost';

lib/core/error.js

@@ -1,5 +1,7 @@
 'use strict';
 
+const MONGODB_ERROR_CODES = require('../error_codes').MONGODB_ERROR_CODES;
+
 const kErrorLabels = Symbol('errorLabels');
 
 /**
@@ -216,32 +218,32 @@ class MongoWriteConcernError extends MongoError {
 
 // see: https://github.com/mongodb/specifications/blob/master/source/retryable-writes/retryable-writes.rst#terms
 const RETRYABLE_ERROR_CODES = new Set([
-  6, // HostUnreachable
-  7, // HostNotFound
-  89, // NetworkTimeout
-  91, // ShutdownInProgress
-  189, // PrimarySteppedDown
-  9001, // SocketException
-  10107, // NotMaster
-  11600, // InterruptedAtShutdown
-  11602, // InterruptedDueToReplStateChange
-  13435, // NotMasterNoSlaveOk
-  13436 // NotMasterOrSecondary
+  MONGODB_ERROR_CODES.HostUnreachable,
+  MONGODB_ERROR_CODES.HostNotFound,
+  MONGODB_ERROR_CODES.NetworkTimeout,
+  MONGODB_ERROR_CODES.ShutdownInProgress,
+  MONGODB_ERROR_CODES.PrimarySteppedDown,
+  MONGODB_ERROR_CODES.SocketException,
+  MONGODB_ERROR_CODES.NotMaster,
+  MONGODB_ERROR_CODES.InterruptedAtShutdown,
+  MONGODB_ERROR_CODES.InterruptedDueToReplStateChange,
+  MONGODB_ERROR_CODES.NotMasterNoSlaveOk,
+  MONGODB_ERROR_CODES.NotMasterOrSecondary
 ]);
 
 const RETRYABLE_WRITE_ERROR_CODES = new Set([
-  11600, // InterruptedAtShutdown
-  11602, // InterruptedDueToReplStateChange
-  10107, // NotMaster
-  13435, // NotMasterNoSlaveOk
-  13436, // NotMasterOrSecondary
-  189, // PrimarySteppedDown
-  91, // ShutdownInProgress
-  7, // HostNotFound
-  6, // HostUnreachable
-  89, // NetworkTimeout
-  9001, // SocketException
-  262 // ExceededTimeLimit
+  MONGODB_ERROR_CODES.InterruptedAtShutdown,
+  MONGODB_ERROR_CODES.InterruptedDueToReplStateChange,
+  MONGODB_ERROR_CODES.NotMaster,
+  MONGODB_ERROR_CODES.NotMasterNoSlaveOk,
+  MONGODB_ERROR_CODES.NotMasterOrSecondary,
+  MONGODB_ERROR_CODES.PrimarySteppedDown,
+  MONGODB_ERROR_CODES.ShutdownInProgress,
+  MONGODB_ERROR_CODES.HostNotFound,
+  MONGODB_ERROR_CODES.HostUnreachable,
+  MONGODB_ERROR_CODES.NetworkTimeout,
+  MONGODB_ERROR_CODES.SocketException,
+  MONGODB_ERROR_CODES.ExceededTimeLimit
 ]);
 
 function isRetryableWriteError(error) {
@@ -271,41 +273,44 @@ function isRetryableError(error) {
 }
 
 const SDAM_RECOVERING_CODES = new Set([
-  91, // ShutdownInProgress
-  189, // PrimarySteppedDown
-  11600, // InterruptedAtShutdown
-  11602, // InterruptedDueToReplStateChange
-  13436 // NotMasterOrSecondary
+  MONGODB_ERROR_CODES.ShutdownInProgress,
+  MONGODB_ERROR_CODES.PrimarySteppedDown,
+  MONGODB_ERROR_CODES.InterruptedAtShutdown,
+  MONGODB_ERROR_CODES.InterruptedDueToReplStateChange,
+  MONGODB_ERROR_CODES.NotMasterOrSecondary
 ]);
 
 const SDAM_NOTMASTER_CODES = new Set([
-  10107, // NotMaster
-  13435 // NotMasterNoSlaveOk
+  MONGODB_ERROR_CODES.NotMaster,
+  MONGODB_ERROR_CODES.NotMasterNoSlaveOk,
+  MONGODB_ERROR_CODES.LegacyNotPrimary
 ]);
 
 const SDAM_NODE_SHUTTING_DOWN_ERROR_CODES = new Set([
-  11600, // InterruptedAtShutdown
-  91 // ShutdownInProgress
+  MONGODB_ERROR_CODES.InterruptedAtShutdown,
+  MONGODB_ERROR_CODES.ShutdownInProgress
 ]);
 
 function isRecoveringError(err) {
-  if (err.code && SDAM_RECOVERING_CODES.has(err.code)) {
-    return true;
+  if (typeof err.code === 'number') {
+    // If any error code exists, we ignore the error.message
+    return SDAM_RECOVERING_CODES.has(err.code);
   }
 
-  return err.message.match(/not master or secondary/) || err.message.match(/node is recovering/);
+  return /not master or secondary/.test(err.message) || /node is recovering/.test(err.message);
 }
 
 function isNotMasterError(err) {
-  if (err.code && SDAM_NOTMASTER_CODES.has(err.code)) {
-    return true;
+  if (typeof err.code === 'number') {
+    // If any error code exists, we ignore the error.message
+    return SDAM_NOTMASTER_CODES.has(err.code);
   }
 
   if (isRecoveringError(err)) {
     return false;
   }
 
-  return err.message.match(/not master/);
+  return /not master/.test(err.message);
 }
 
 function isNodeShuttingDownError(err) {
@@ -316,10 +321,9 @@ function isNodeShuttingDownError(err) {
  * Determines whether SDAM can recover from a given error. If it cannot
  * then the pool will be cleared, and server state will completely reset
  * locally.
- *
- * @ignore
  * @see https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-discovery-and-monitoring.rst#not-master-and-node-is-recovering
- * @param {MongoError|Error} error
+ * @param {MongoError} error
+ * @returns {boolean}
  */
 function isSDAMUnrecoverableError(error) {
   // NOTE: null check is here for a strictly pre-CMAP world, a timeout or
@@ -328,11 +332,7 @@ function isSDAMUnrecoverableError(error) {
     return true;
   }
 
-  if (isRecoveringError(error) || isNotMasterError(error)) {
-    return true;
-  }
-
-  return false;
+  return isRecoveringError(error) || isNotMasterError(error);
 }
 
 module.exports = {

lib/core/sdam/monitor.js

@@ -65,7 +65,8 @@ class Monitor extends EventEmitter {
       heartbeatFrequencyMS:
         typeof options.heartbeatFrequencyMS === 'number' ? options.heartbeatFrequencyMS : 10000,
       minHeartbeatFrequencyMS:
-        typeof options.minHeartbeatFrequencyMS === 'number' ? options.minHeartbeatFrequencyMS : 500
+        typeof options.minHeartbeatFrequencyMS === 'number' ? options.minHeartbeatFrequencyMS : 500,
+      useUnifiedTopology: options.useUnifiedTopology
     });
 
     // TODO: refactor this to pull it directly from the pool, requires new ConnectionPool integration
@@ -205,8 +206,15 @@ function checkServer(monitor, callback) {
     const topologyVersion = monitor[kServer].description.topologyVersion;
     const isAwaitable = topologyVersion != null;
     const serverApi = monitor[kConnection].serverApi;
+    const helloOk = monitor[kConnection].helloOk;
+
+    const cmd = {
+      [serverApi || helloOk ? 'hello' : 'ismaster']: true
+    };
+
+    // written this way omit helloOk from the command if its false-y (do not want -> helloOk: null)
+    if (helloOk) cmd.helloOk = helloOk;
 
-    const cmd = { [serverApi ? 'hello' : 'ismaster']: true };
     const options = { socketTimeout: connectTimeoutMS };
 
     if (isAwaitable) {

lib/core/sdam/server_description.js

@@ -70,6 +70,10 @@ class ServerDescription {
       ismaster
     );
 
+    if (ismaster.isWritablePrimary != null) {
+      ismaster.ismaster = ismaster.isWritablePrimary;
+    }
+
     this.address = address;
     this.error = options.error;
     this.roundTripTime = options.roundTripTime || -1;

lib/core/topologies/replset_state.js

@@ -34,7 +34,7 @@ var ReplSetState = function(options) {
   // Add event listener
   EventEmitter.call(this);
   // Topology state
-  this.topologyType = TopologyType.ReplicaSetNoPrimary;
+  this.topologyType = options.setName ? TopologyType.ReplicaSetNoPrimary : TopologyType.Unknown;
   this.setName = options.setName;
 
   // Server set
@@ -218,7 +218,8 @@ const isArbiter = ismaster => ismaster.arbiterOnly && ismaster.setName;
 ReplSetState.prototype.update = function(server) {
   var self = this;
   // Get the current ismaster
-  var ismaster = server.lastIsMaster();
+  const ismaster = server.lastIsMaster();
+  if (ismaster && ismaster.isWritablePrimary) ismaster.ismaster = ismaster.isWritablePrimary;
 
   // Get the server name and lowerCase it
   var serverName = server.name.toLowerCase();
@@ -358,7 +359,8 @@ ReplSetState.prototype.update = function(server) {
   // Standalone server, destroy and return
   //
   if (ismaster && ismaster.ismaster && !ismaster.setName) {
-    this.topologyType = this.primary ? TopologyType.ReplicaSetWithPrimary : TopologyType.Unknown;
+    // We should not mark the topology as Unknown because of one standalone
+    // we should just remove this server from the set
     this.remove(server, { force: true });
     return false;
   }

lib/core/topologies/shared.js

@@ -1,11 +1,14 @@
 'use strict';
+
+const MONGODB_ERROR_CODES = require('../../error_codes').MONGODB_ERROR_CODES;
 const ReadPreference = require('./read_preference');
 const TopologyType = require('../sdam/common').TopologyType;
 const MongoError = require('../error').MongoError;
 const isRetryableWriteError = require('../error').isRetryableWriteError;
 const maxWireVersion = require('../utils').maxWireVersion;
 const MongoNetworkError = require('../error').MongoNetworkError;
-const MMAPv1_RETRY_WRITES_ERROR_CODE = 20;
+
+const MMAPv1_RETRY_WRITES_ERROR_CODE = MONGODB_ERROR_CODES.IllegalOperation;
 
 /**
  * Emit event if it exists

lib/core/uri_parser.js

@@ -106,6 +106,11 @@ function parseSrvConnectionString(uri, options, callback) {
         }
 
         record = qs.parse(record[0].join(''));
+
+        if (Object.keys(record).some(k => k.toLowerCase() === 'loadbalanced')) {
+          return callback(new MongoParseError('Load balancer mode requires driver version 4+'));
+        }
+
         if (Object.keys(record).some(key => key !== 'authSource' && key !== 'replicaSet')) {
           return callback(
             new MongoParseError('Text record must only set `authSource` or `replicaSet`')
@@ -598,6 +603,10 @@ function parseConnectionString(uri, options, callback) {
 
   parsedOptions = Object.assign({}, parsedOptions, options);
 
+  if (Object.keys(parsedOptions).some(k => k.toLowerCase() === 'loadbalanced')) {
+    return callback(new MongoParseError('Load balancer mode requires driver version 4+'));
+  }
+
   if (protocol === PROTOCOL_MONGODB_SRV) {
     return parseSrvConnectionString(uri, parsedOptions, callback);
   }