fix(core): Pg-promise de-initialization fix (#7417)

Github issue / Community forum post (link here to close automatically):

https://community.n8n.io/t/postgres-node-called-end-on-pool-more-than-once/30585/1

packages/nodes-base/nodes/CrateDb/CrateDb.node.ts

@@ -378,15 +378,15 @@ export class CrateDb implements INodeType {
 				returnItems = this.helpers.returnJsonArray(getItemsCopy(items, columns));
 			}
 		} else {
-			pgp.end();
+			await db.$pool.end();
 			throw new NodeOperationError(
 				this.getNode(),
 				`The operation "${operation}" is not supported!`,
 			);
 		}
 
-		// Close the connection
+		// shuts down the connection pool associated with the db object to allow the process to finish
-		pgp.end();
+		await db.$pool.end();
 
 		return [returnItems];
 	}

packages/nodes-base/nodes/Microsoft/Sql/MicrosoftSql.node.ts

@@ -440,7 +440,7 @@ export class MicrosoftSql implements INodeType {
 			}
 		}
 
-		// Close the connection
+		// shuts down the connection pool associated with the db object to allow the process to finish
 		await pool.close();
 
 		const itemData = generatePairedItemData(items.length);

packages/nodes-base/nodes/Postgres/PostgresTrigger.functions.ts

@@ -112,19 +112,19 @@ export async function initDB(this: ITriggerFunctions | ILoadOptionsFunctions) {
 }
 
 export async function searchSchema(this: ILoadOptionsFunctions): Promise<INodeListSearchResult> {
-	const { db, pgp } = await initDB.call(this);
+	const { db } = await initDB.call(this);
 	const schemaList = await db.any('SELECT schema_name FROM information_schema.schemata');
 	const results: INodeListSearchItems[] = (schemaList as IDataObject[]).map((s) => ({
 		name: s.schema_name as string,
 		value: s.schema_name as string,
 	}));
-	pgp.end();
+	await db.$pool.end();
 	return { results };
 }
 
 export async function searchTables(this: ILoadOptionsFunctions): Promise<INodeListSearchResult> {
 	const schema = this.getNodeParameter('schema', 0) as IDataObject;
-	const { db, pgp } = await initDB.call(this);
+	const { db } = await initDB.call(this);
 	let tableList = [];
 	try {
 		tableList = await db.any(
@@ -138,6 +138,6 @@ export async function searchTables(this: ILoadOptionsFunctions): Promise<INodeLi
 		name: s.table_name as string,
 		value: s.table_name as string,
 	}));
-	pgp.end();
+	await db.$pool.end();
 	return { results };
 }

packages/nodes-base/nodes/Postgres/PostgresTrigger.node.ts

@@ -224,7 +224,7 @@ export class PostgresTrigger implements INodeType {
 		const additionalFields = this.getNodeParameter('additionalFields', 0) as IDataObject;
 
 		// initialize and connect to database
-		const { db, pgp } = await initDB.call(this);
+		const { db } = await initDB.call(this);
 		const connection = await db.connect({ direct: true });
 
 		// prepare and set up listener
@@ -284,7 +284,7 @@ export class PostgresTrigger implements INodeType {
 					`Postgres Trigger Error: ${(error as Error).message}`,
 				);
 			} finally {
-				pgp.end();
+				await db.$pool.end();
 			}
 		};
 

packages/nodes-base/nodes/Postgres/v1/PostgresV1.node.ts

@@ -323,7 +323,7 @@ export class PostgresV1 implements INodeType {
 
 					const db = pgp(config);
 					await db.connect();
-					pgp.end();
+					await db.$pool.end();
 				} catch (error) {
 					return {
 						status: 'Error',
@@ -412,15 +412,15 @@ export class PostgresV1 implements INodeType {
 
 			returnItems = wrapData(updateItems);
 		} else {
-			pgp.end();
+			await db.$pool.end();
 			throw new NodeOperationError(
 				this.getNode(),
 				`The operation "${operation}" is not supported!`,
 			);
 		}
 
-		// Close the connection
+		// shuts down the connection pool associated with the db object to allow the process to finish
-		pgp.end();
+		await db.$pool.end();
 
 		return [returnItems];
 	}

packages/nodes-base/nodes/QuestDb/QuestDb.node.ts

@@ -256,15 +256,15 @@ export class QuestDb implements INodeType {
 
 			returnItems = this.helpers.returnJsonArray(insertData);
 		} else {
-			pgp.end();
+			await db.$pool.end();
 			throw new NodeOperationError(
 				this.getNode(),
 				`The operation "${operation}" is not supported!`,
 			);
 		}
 
-		// Close the connection
+		// shuts down the connection pool associated with the db object to allow the process to finish
-		pgp.end();
+		await db.$pool.end();
 
 		return [returnItems];
 	}

packages/nodes-base/nodes/TimescaleDb/TimescaleDb.node.ts

@@ -320,15 +320,15 @@ export class TimescaleDb implements INodeType {
 
 			returnItems = this.helpers.returnJsonArray(updateItems);
 		} else {
-			pgp.end();
+			await db.$pool.end();
 			throw new NodeOperationError(
 				this.getNode(),
 				`The operation "${operation}" is not supported!`,
 			);
 		}
 
-		// Close the connection
+		// shuts down the connection pool associated with the db object to allow the process to finish
-		pgp.end();
+		await db.$pool.end();
 
 		return [returnItems];
 	}