fix: query and error logging both occur on error.

src/driver/runtime-driver.ts

@@ -117,15 +117,19 @@ export class RuntimeDriver implements Driver {
     connection.executeQuery = async (
       compiledQuery
     ): Promise<QueryResult<any>> => {
+      let caughtError: unknown
       const startTime = performanceNow()
 
       try {
         return await executeQuery.call(connection, compiledQuery)
       } catch (error) {
+        caughtError = error
         await this.#logError(error, compiledQuery, startTime)
         throw error
       } finally {
-        await this.#logQuery(compiledQuery, startTime)
+        if (!caughtError) {
+          await this.#logQuery(compiledQuery, startTime)
+        }
       }
     }
   }

src/util/log.ts

@@ -72,7 +72,13 @@ function defaultLogger(event: LogEvent): void {
     if (event.error instanceof Error) {
       console.error(`kysely:error: ${event.error.stack ?? event.error.message}`)
     } else {
-      console.error(`kysely:error: ${event}`)
+      console.error(
+        `kysely:error: ${JSON.stringify({
+          error: event.error,
+          query: event.query.sql,
+          queryDurationMillis: event.queryDurationMillis,
+        })}`
+      )
     }
   }
 }

test/node/src/log-once.test.ts

@@ -7,7 +7,11 @@ describe('logOnce', () => {
   const sandbox = createSandbox()
 
   before(() => {
-    logSpy = sandbox.spy(console, 'log')
+    logSpy = sandbox.stub(console, 'log')
+  })
+
+  after(() => {
+    sandbox.restore()
   })
 
   it('should log each message once.', () => {

test/node/src/logging.test.ts

@@ -0,0 +1,183 @@
+import { SinonSandbox, SinonSpy, createSandbox } from 'sinon'
+import { Database, expect } from './test-setup'
+import {
+  DatabaseConnection,
+  Driver,
+  DummyDriver,
+  Kysely,
+  LogConfig,
+  PostgresDialect,
+} from '../../..'
+
+describe('logging', () => {
+  let sandbox: SinonSandbox
+  let errorSpy: SinonSpy
+  let logSpy: SinonSpy
+
+  beforeEach(() => {
+    sandbox = createSandbox()
+    errorSpy = sandbox.stub(console, 'error')
+    logSpy = sandbox.stub(console, 'log')
+  })
+
+  afterEach(() => {
+    sandbox.restore()
+  })
+
+  describe('when query execution succeeds', () => {
+    describe('when query logging is disabled', () => {
+      describe('when error logging is disabled', () => {
+        const db = getKysely([])
+
+        it('should not log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.false
+        })
+
+        it('should not log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.false
+        })
+      })
+
+      describe('when error logging is enabled', () => {
+        const db = getKysely(['error'])
+
+        it('should not log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.false
+        })
+
+        it('should not log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.false
+        })
+      })
+    })
+
+    describe('when query logging is enabled', () => {
+      describe('when error logging is disabled', () => {
+        const db = getKysely(['query'])
+
+        it('should log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.true
+        })
+
+        it('should not log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.false
+        })
+      })
+
+      describe('when error logging is enabled', () => {
+        const db = getKysely(['query', 'error'])
+
+        it('should log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.true
+        })
+
+        it('should not log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.false
+        })
+      })
+    })
+  })
+
+  describe('when query execution fails', () => {
+    const executeQuery = () => Promise.reject('oops')
+
+    describe('when query logging is disabled', () => {
+      describe('when error logging is disabled', () => {
+        const db = getKysely([], executeQuery)
+
+        it('should not log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.false
+        })
+
+        it('should not log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.false
+        })
+      })
+
+      describe('when error logging is enabled', () => {
+        const db = getKysely(['error'], executeQuery)
+
+        it('should not log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.false
+        })
+
+        it('should log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.true
+        })
+      })
+    })
+
+    describe('when query logging is enabled', () => {
+      describe('when error logging is disabled', () => {
+        const db = getKysely(['query'], executeQuery)
+
+        it('should not log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.false
+        })
+
+        it('should not log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.false
+        })
+      })
+
+      describe('when error logging is enabled', () => {
+        const db = getKysely(['query', 'error'], executeQuery)
+
+        it('should not log query', async () => {
+          await run(db)
+          expect(logSpy.called).to.be.false
+        })
+
+        it('should log error', async () => {
+          await run(db)
+          expect(errorSpy.called).to.be.true
+        })
+      })
+    })
+  })
+})
+
+function getKysely(
+  log: LogConfig,
+  executeQuery: DatabaseConnection['executeQuery'] = () =>
+    Promise.resolve({ rows: [] })
+): Kysely<Database> {
+  return new Kysely({
+    dialect: new (class extends PostgresDialect {
+      constructor() {
+        super({ pool: {} as any })
+      }
+      createDriver(): Driver {
+        return new (class extends DummyDriver {
+          acquireConnection(): Promise<DatabaseConnection> {
+            return Promise.resolve({
+              executeQuery,
+              streamQuery: (async () => {}) as any,
+            })
+          }
+        })()
+      }
+    })(),
+    log,
+  })
+}
+
+async function run(db: Kysely<Database>) {
+  try {
+    await db.selectFrom('person').selectAll().execute()
+  } catch (err) {}
+}