[PECO-1541] Optimize UC Volume ingestion (#247)

* [PECO-1541] Optimize UC Volume ingestion

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

* Refine the code

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

---------

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

Author: kravets-levko

lib/DBSQLSession.ts

@@ -1,5 +1,7 @@
 import * as fs from 'fs';
 import * as path from 'path';
+import stream from 'node:stream';
+import util from 'node:util';
 import { stringify, NIL, parse } from 'uuid';
 import fetch, { HeadersInit } from 'node-fetch';
 import {
@@ -36,6 +38,9 @@ import { DBSQLParameter, DBSQLParameterValue } from './DBSQLParameter';
 import ParameterError from './errors/ParameterError';
 import IClientContext, { ClientConfig } from './contracts/IClientContext';
 
+// Explicitly promisify a callback-style `pipeline` because `node:stream/promises` is not available in Node 14
+const pipeline = util.promisify(stream.pipeline);
+
 const defaultMaxRows = 100000;
 
 interface OperationResponseShape {
@@ -271,8 +276,10 @@ export default class DBSQLSession implements IDBSQLSession {
     if (!response.ok) {
       throw new StagingError(`HTTP error ${response.status} ${response.statusText}`);
     }
-    const buffer = await response.arrayBuffer();
-    fs.writeFileSync(localFile, Buffer.from(buffer));
+
+    const fileStream = fs.createWriteStream(localFile);
+    // `pipeline` will do all the dirty job for us, including error handling and closing all the streams properly
+    return pipeline(response.body, fileStream);
   }
 
   private async handleStagingRemove(presignedUrl: string, headers: HeadersInit): Promise<void> {
@@ -301,8 +308,19 @@ export default class DBSQLSession implements IDBSQLSession {
     const connectionProvider = await this.context.getConnectionProvider();
     const agent = await connectionProvider.getAgent();
 
-    const data = fs.readFileSync(localFile);
-    const response = await fetch(presignedUrl, { method: 'PUT', headers, agent, body: data });
+    const fileStream = fs.createReadStream(localFile);
+    const fileInfo = fs.statSync(localFile, { bigint: true });
+
+    const response = await fetch(presignedUrl, {
+      method: 'PUT',
+      headers: {
+        ...headers,
+        // This header is required by server
+        'Content-Length': fileInfo.size.toString(),
+      },
+      agent,
+      body: fileStream,
+    });
     if (!response.ok) {
       throw new StagingError(`HTTP error ${response.status} ${response.statusText}`);
     }