Support connection pool

jest.config.js

@@ -5,7 +5,7 @@ module.exports = {
   moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
   testTimeout: 60000,
   // because user will cause other test fail, but we still have user spec
-  coveragePathIgnorePatterns: ['/milvus/User.ts'],
+  coveragePathIgnorePatterns: ['dist'],
   testPathIgnorePatterns: ['cloud.spec.ts', 'serverless.spec.ts'], // add this line
   testEnvironmentOptions: {
     NODE_ENV: 'production',

milvus/MilvusClient.ts

@@ -60,8 +60,14 @@ export class MilvusClient extends GRPCClient {
     logger.debug(
       `new client initialized, version: ${MilvusClient.sdkInfo.version} `
     );
-    // connect();
-    this.connect(MilvusClient.sdkInfo.version);
+
+    // If the configOrAddress is a string (i.e., the server's address), or if the configOrAddress object does not have the __SKIP_CONNECT__ property set to true, then establish a connection to the Milvus server using the current SDK version.
+    if (
+      typeof configOrAddress === 'string' ||
+      !(configOrAddress as ClientConfig).__SKIP_CONNECT__
+    ) {
+      this.connect(MilvusClient.sdkInfo.version);
+    }
   }
 
   // High level API: align with pymilvus

milvus/const/client.ts

@@ -6,9 +6,10 @@ export enum METADATA {
 
 export enum CONNECT_STATUS {
   NOT_CONNECTED,
-  CONNECTING,
-  CONNECTED,
+  CONNECTING = 0, // GRPC channel state connecting
+  CONNECTED = 1, // GRPC channel state ready
   UNIMPLEMENTED,
+  SHUTDOWN = 5, // GRPC channel state shutdown
 }
 
 export enum TLS_MODE {

milvus/const/defaults.ts

@@ -16,3 +16,6 @@ export const DEFAULT_DYNAMIC_FIELD = '$meta';
 export const DEFAULT_COUNT_QUERY_STRING = 'count(*)';
 export const DEFAULT_HTTP_TIMEOUT = 60000; // 60s
 export const DEFAULT_HTTP_ENDPOINT_VERSION = 'v1'; // api version, default v1
+
+export const DEFAULT_POOL_MAX = 10; // default max pool client number
+export const DEFAULT_POOL_MIN = 2; // default min pool client number

milvus/grpc/BaseClient.ts

@@ -1,7 +1,14 @@
 import path from 'path';
 import crypto from 'crypto';
 import protobuf, { Root, Type } from 'protobufjs';
-import { Client, ChannelOptions } from '@grpc/grpc-js';
+import { readFileSync } from 'fs';
+import {
+  Client,
+  ChannelOptions,
+  credentials,
+  ChannelCredentials,
+} from '@grpc/grpc-js';
+import { Pool } from 'generic-pool';
 import {
   ERROR_REASONS,
   ClientConfig,
@@ -26,18 +33,36 @@ const schemaProtoPath = path.resolve(
  * Base gRPC client, setup all configuration here
  */
 export class BaseClient {
+  // channel pool
+  public channelPool!: Pool<Client>;
   // Client ID
-  clientId: string = `${crypto.randomUUID()}`;
+  public clientId: string = `${crypto.randomUUID()}`;
   // flags to indicate that if the connection is established and its state
-  connectStatus = CONNECT_STATUS.NOT_CONNECTED;
-  connectPromise = Promise.resolve();
-  // metadata
-  protected metadata: Map<string, string> = new Map<string, string>();
-  // The path to the Milvus protobuf file.
-  protected protoFilePath = {
+  public connectStatus = CONNECT_STATUS.NOT_CONNECTED;
+  // connection promise
+  public connectPromise = Promise.resolve();
+  // TLS mode, by default it is disabled
+  public readonly tlsMode: TLS_MODE = TLS_MODE.DISABLED;
+  // The client configuration.
+  public readonly config: ClientConfig;
+  // grpc options
+  public readonly channelOptions: ChannelOptions;
+  // server info
+  public serverInfo: ServerInfo = {};
+  // // The gRPC client instance.
+  // public client!: Promise<Client>;
+  // The timeout for connecting to the Milvus service.
+  public timeout: number = DEFAULT_CONNECT_TIMEOUT;
+  // The path to the Milvus protobuf file, user can define it from clientConfig
+  public protoFilePath = {
     milvus: milvusProtoPath,
     schema: schemaProtoPath,
   };
+
+  // ChannelCredentials object used for authenticating the client on the gRPC channel.
+  protected creds!: ChannelCredentials;
+  // global metadata, send each grpc request with it
+  protected metadata: Map<string, string> = new Map<string, string>();
   // The protobuf schema.
   protected schemaProto: Root;
   // The Milvus protobuf.
@@ -46,27 +71,13 @@ export class BaseClient {
   protected collectionSchemaType: Type;
   // The milvus field schema Type
   protected fieldSchemaType: Type;
-
   // milvus proto
   protected readonly protoInternalPath = {
     serviceName: 'milvus.proto.milvus.MilvusService',
     collectionSchema: 'milvus.proto.schema.CollectionSchema',
     fieldSchema: 'milvus.proto.schema.FieldSchema',
   };
 
-  // TLS mode, by default it is disabled
-  public readonly tlsMode: TLS_MODE = TLS_MODE.DISABLED;
-  // The client configuration.
-  public readonly config: ClientConfig;
-  // grpc options
-  public readonly channelOptions: ChannelOptions;
-  // server info
-  public serverInfo: ServerInfo = {};
-  // The gRPC client instance.
-  public client: Client | undefined;
-  // The timeout for connecting to the Milvus service.
-  public timeout: number = DEFAULT_CONNECT_TIMEOUT;
-
   /**
    * Sets up the configuration object for the gRPC client.
    *
@@ -163,6 +174,51 @@ export class BaseClient {
         this.config.tls.serverName;
     }
 
+    // Switch based on the TLS mode
+    switch (this.tlsMode) {
+      case TLS_MODE.ONE_WAY:
+        // Create SSL credentials with empty parameters for one-way authentication
+        this.creds = credentials.createSsl();
+        break;
+      case TLS_MODE.TWO_WAY:
+        // Extract paths for root certificate, private key, certificate chain, and verify options from the client configuration
+        const { rootCertPath, privateKeyPath, certChainPath, verifyOptions } =
+          this.config.tls!;
+
+        // Initialize buffers for root certificate, private key, and certificate chain
+        let rootCertBuff: Buffer | null = null;
+        let privateKeyBuff: Buffer | null = null;
+        let certChainBuff: Buffer | null = null;
+
+        // Read root certificate file if path is provided
+        if (rootCertPath) {
+          rootCertBuff = readFileSync(rootCertPath);
+        }
+
+        // Read private key file if path is provided
+        if (privateKeyPath) {
+          privateKeyBuff = readFileSync(privateKeyPath);
+        }
+
+        // Read certificate chain file if path is provided
+        if (certChainPath) {
+          certChainBuff = readFileSync(certChainPath);
+        }
+
+        // Create SSL credentials with the read files and verify options for two-way authentication
+        this.creds = credentials.createSsl(
+          rootCertBuff,
+          privateKeyBuff,
+          certChainBuff,
+          verifyOptions
+        );
+        break;
+      default:
+        // Create insecure credentials if no TLS mode is specified
+        this.creds = credentials.createInsecure();
+        break;
+    }
+
     // Set up the timeout for connecting to the Milvus service.
     this.timeout =
       typeof config.timeout === 'string'

milvus/grpc/Collection.ts

@@ -153,7 +153,7 @@ export class Collection extends Database {
 
     // Call the promisify function to create the collection.
     const createPromise = await promisify(
-      this.client,
+      this.channelPool,
       'CreateCollection',
       {
         ...data,
@@ -201,7 +201,7 @@ export class Collection extends Database {
 
     // avoid to call describe collection, because it has cache
     const res = await promisify(
-      this.client,
+      this.channelPool,
       'DescribeCollection',
       data,
       data.timeout || this.timeout
@@ -242,7 +242,7 @@ export class Collection extends Database {
     data?: ShowCollectionsReq
   ): Promise<ShowCollectionsResponse> {
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'ShowCollections',
       {
         type: data ? data.type : ShowCollectionsType.All,
@@ -290,7 +290,7 @@ export class Collection extends Database {
   async alterCollection(data: AlterCollectionReq): Promise<ResStatus> {
     checkCollectionName(data);
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'AlterCollection',
       {
         collection_name: data.collection_name,
@@ -346,7 +346,7 @@ export class Collection extends Database {
 
     // get new data
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'DescribeCollection',
       data,
       data.timeout || this.timeout
@@ -391,7 +391,7 @@ export class Collection extends Database {
     checkCollectionName(data);
 
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'GetCollectionStatistics',
       data,
       data.timeout || this.timeout
@@ -432,7 +432,7 @@ export class Collection extends Database {
     checkCollectionName(data);
 
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'LoadCollection',
       data,
       data.timeout || this.timeout
@@ -470,7 +470,7 @@ export class Collection extends Database {
     checkCollectionName(data);
 
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'LoadCollection',
       data,
       data.timeout || this.timeout
@@ -529,7 +529,7 @@ export class Collection extends Database {
     checkCollectionName(data);
 
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'ReleaseCollection',
       data,
       data.timeout || this.timeout
@@ -564,7 +564,7 @@ export class Collection extends Database {
    */
   async renameCollection(data: RenameCollectionReq): Promise<ResStatus> {
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'RenameCollection',
       {
         oldName: data.collection_name,
@@ -602,7 +602,7 @@ export class Collection extends Database {
     checkCollectionName(data);
 
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'DropCollection',
       data,
       data.timeout || this.timeout
@@ -649,7 +649,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.ALIAS_NAME_IS_REQUIRED);
     }
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'CreateAlias',
       data,
       data.timeout || this.timeout
@@ -688,7 +688,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.ALIAS_NAME_IS_REQUIRED);
     }
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'DropAlias',
       data,
       data.timeout || this.timeout
@@ -728,7 +728,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.ALIAS_NAME_IS_REQUIRED);
     }
     const promise = await promisify(
-      this.client,
+      this.channelPool,
       'AlterAlias',
       data,
       data.timeout || this.timeout
@@ -763,7 +763,7 @@ export class Collection extends Database {
     checkCollectionName(data);
     const collectionInfo = await this.describeCollection(data);
     const res = await promisify(
-      this.client,
+      this.channelPool,
       'ManualCompaction',
       {
         collectionID: collectionInfo.collectionID,
@@ -803,7 +803,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.COMPACTION_ID_IS_REQUIRED);
     }
     const res = await promisify(
-      this.client,
+      this.channelPool,
       'GetCompactionState',
       data,
       data.timeout || this.timeout
@@ -841,7 +841,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.COMPACTION_ID_IS_REQUIRED);
     }
     const res = await promisify(
-      this.client,
+      this.channelPool,
       'GetCompactionStateWithPlans',
       data,
       data.timeout || this.timeout
@@ -894,7 +894,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.COLLECTION_ID_IS_REQUIRED);
     }
     const res = await promisify(
-      this.client,
+      this.channelPool,
       'GetReplicas',
       data,
       data.timeout || this.timeout
@@ -935,7 +935,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.COLLECTION_NAME_IS_REQUIRED);
     }
     const res = await promisify(
-      this.client,
+      this.channelPool,
       'GetLoadingProgress',
       data,
       data.timeout || this.timeout
@@ -973,7 +973,7 @@ export class Collection extends Database {
       throw new Error(ERROR_REASONS.COLLECTION_NAME_IS_REQUIRED);
     }
     const res = await promisify(
-      this.client,
+      this.channelPool,
       'GetLoadState',
       data,
       data.timeout || this.timeout