feat: add custom logging

src/client.ts

@@ -107,6 +107,7 @@ export class RDSClient extends Operator {
         connection,
       } as ConnectionMessage);
     });
+    this.logging = options.logging;
   }
 
   async query<T = any>(sql: string, values?: object | any[]): Promise<T> {
@@ -162,6 +163,7 @@ export class RDSClient extends Operator {
     try {
       const _conn = await this.getConnectionWithTimeout();
       const conn = new RDSConnection(_conn);
+      conn.setLogging(this.logging);
       if (this.beforeQueryHandlers.length > 0) {
         for (const handler of this.beforeQueryHandlers) {
           conn.beforeQuery(handler);

src/operator.ts

@@ -9,6 +9,7 @@ import {
   SelectOption,
   UpdateOption, UpdateResult, UpdateRow,
   PoolConnectionPromisify,
+  Logging,
 } from './types';
 import channels from './channels';
 import type { QueryStartMessage, QueryEndMessage } from './channels';
@@ -20,6 +21,8 @@ const debug = debuglog('ali-rds:operator');
  */
 export abstract class Operator {
   #connection: PoolConnectionPromisify;
+  logging?: Logging;
+
   constructor(connection?: PoolConnectionPromisify) {
     if (connection) {
       this.#connection = connection;
@@ -43,6 +46,10 @@ export abstract class Operator {
     this.afterQueryHandlers.push(afterQueryHandler);
   }
 
+  setLogging(logging?: Logging) {
+    this.logging = logging;
+  }
+
   escape(value: any, stringifyObjects?: boolean, timeZone?: string): string {
     return SqlString.escape(value, stringifyObjects, timeZone);
   }
@@ -80,6 +87,9 @@ export abstract class Operator {
       }
     }
     debug('[connection#%s] query %o', this.threadId, sql);
+    if (typeof this.logging === 'function') {
+      this.logging(sql, { threadId: this.threadId });
+    }
     const queryStart = performance.now();
     let rows: any;
     let lastError: Error | undefined;

src/types.ts

@@ -9,6 +9,7 @@ export interface RDSClientOptions extends PoolConfig {
   connectionStorage?: AsyncLocalStorage<Record<PropertyKey, RDSTransaction>>;
   getConnectionConfig?: GetConnectionConfig;
   poolWaitTimeout?: number;
+  logging?: Logging;
 }
 
 export interface PoolConnectionPromisify extends Omit<PoolConnection, 'query'> {
@@ -67,3 +68,5 @@ export type AfterQueryHandler = (sql: string, result: any, execDuration: number,
 
 export type TransactionContext = Record<PropertyKey, RDSTransaction | null>;
 export type TransactionScope = (transaction: RDSTransaction) => Promise<any>;
+
+export type Logging = (message: string, ...args: any[]) => any;

test/client.test.ts

@@ -338,6 +338,30 @@ describe('test/client.test.ts', () => {
     });
   });
 
+  describe('logging', () => {
+    const mockLogs: string[] = [];
+
+    it('should logging sql', async () => {
+      const db = new RDSClient({
+        ...config,
+        logging: (sql, { threadId }) => {
+          assert(typeof threadId === 'number');
+          mockLogs.push(sql);
+        },
+      });
+
+      await db.query('show tables');
+      assert.deepEqual(mockLogs, [ 'show tables' ]);
+      // logging SQL string with variable replaced
+      await db.query('select * from ?? where email = ? limit 1',
+        [ table, prefix + '[email protected]' ]);
+      assert.deepEqual(mockLogs, [
+        'show tables',
+        `select * from \`${table}\` where email = '${prefix + '[email protected]'}' limit 1`,
+      ]);
+    });
+  });
+
   describe('beginTransactionScope(scope)', () => {
     it('should beginTransactionScope() error', async () => {
       const failDB = new RDSClient({