Treat all binary types equally throughout transport

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@elastic/transport",
-  "version": "8.9.0",
+  "version": "8.9.1",
   "description": "Transport classes and utilities shared among Node.js Elastic client libraries",
   "main": "./index.js",
   "types": "index.d.ts",

src/Transport.ts

@@ -36,6 +36,7 @@ import {
   ErrorOptions
 } from './errors'
 import { Connection, ConnectionRequestParams } from './connection'
+import { isBinary } from './connection/BaseConnection'
 import Diagnostic from './Diagnostic'
 import Serializer from './Serializer'
 import { Readable as ReadableStream } from 'node:stream'
@@ -556,18 +557,7 @@ export default class Transport {
           body = await unzip(body)
         }
 
-        const binaryTypes = [
-          'application/vnd.mapbox-vector-tile',
-          'application/vnd.apache.arrow.stream',
-          'application/vnd.elasticsearch+arrow+stream',
-          'application/smile',
-          'application/vnd.elasticsearch+smile',
-          'application/cbor',
-          'application/vnd.elasticsearch+cbor'
-        ]
-        const contentType = headers['content-type'] ?? ''
-        const isBinary = binaryTypes.map(type => contentType.includes(type)).includes(true)
-        if (Buffer.isBuffer(body) && !isBinary) {
+        if (Buffer.isBuffer(body) && !isBinary(headers['content-type'] ?? '')) {
           body = body.toString()
         }
 

src/connection/BaseConnection.ts

@@ -248,3 +248,19 @@ export function isCaFingerprintMatch (cert1: string | null, cert2: string | null
   }
   return cert1 === cert2
 }
+
+export function isBinary (contentType: string | string[]): boolean {
+  const binaryTypes = [
+    'application/vnd.mapbox-vector-tile',
+    'application/vnd.apache.arrow.stream',
+    'application/vnd.elasticsearch+arrow+stream',
+    'application/smile',
+    'application/vnd.elasticsearch+smile',
+    'application/cbor',
+    'application/vnd.elasticsearch+cbor'
+  ]
+
+  return binaryTypes
+    .map(type => contentType.includes(type))
+    .includes(true)
+}

src/connection/HttpConnection.ts

@@ -33,7 +33,8 @@ import BaseConnection, {
   ConnectionRequestResponse,
   ConnectionRequestResponseAsStream,
   getIssuerCertificate,
-  isCaFingerprintMatch
+  isCaFingerprintMatch,
+  isBinary
 } from './BaseConnection'
 import { kCaFingerprint } from '../symbols'
 import { Readable as ReadableStream, pipeline } from 'node:stream'
@@ -147,7 +148,7 @@ export default class HttpConnection extends BaseConnection {
 
         const contentEncoding = (response.headers['content-encoding'] ?? '').toLowerCase()
         const isCompressed = contentEncoding.includes('gzip') || contentEncoding.includes('deflate')
-        const isVectorTile = (response.headers['content-type'] ?? '').includes('application/vnd.mapbox-vector-tile')
+        const bodyIsBinary = isBinary(response.headers['content-type'] ?? '')
 
         /* istanbul ignore else */
         if (response.headers['content-length'] !== undefined) {
@@ -167,8 +168,8 @@ export default class HttpConnection extends BaseConnection {
 
         // if the response is compressed, we must handle it
         // as buffer for allowing decompression later
-        let payload = isCompressed || isVectorTile ? new Array<Buffer>() : ''
-        const onData = isCompressed || isVectorTile ? onDataAsBuffer : onDataAsString
+        let payload = isCompressed || bodyIsBinary ? new Array<Buffer>() : ''
+        const onData = isCompressed || bodyIsBinary ? onDataAsBuffer : onDataAsString
 
         let currentLength = 0
         function onDataAsBuffer (chunk: Buffer): void {
@@ -208,13 +209,13 @@ export default class HttpConnection extends BaseConnection {
           }
 
           resolve({
-            body: isCompressed || isVectorTile ? Buffer.concat(payload as Buffer[]) : payload as string,
+            body: isCompressed || bodyIsBinary ? Buffer.concat(payload as Buffer[]) : payload as string,
             statusCode: response.statusCode as number,
             headers: response.headers
           })
         }
 
-        if (!isCompressed && !isVectorTile) {
+        if (!isCompressed && !bodyIsBinary) {
           response.setEncoding('utf8')
         }
 

src/connection/UndiciConnection.ts

@@ -31,7 +31,8 @@ import BaseConnection, {
   ConnectionRequestResponse,
   ConnectionRequestResponseAsStream,
   getIssuerCertificate,
-  isCaFingerprintMatch
+  isCaFingerprintMatch,
+  isBinary
 } from './BaseConnection'
 import { Pool, buildConnector, Dispatcher } from 'undici'
 import {
@@ -182,7 +183,7 @@ export default class Connection extends BaseConnection {
     // @ts-expect-error Assume header is not string[] for now.
     const contentEncoding = (response.headers['content-encoding'] ?? '').toLowerCase()
     const isCompressed = contentEncoding.includes('gzip') || contentEncoding.includes('deflate') // eslint-disable-line
-    const isVectorTile = (response.headers['content-type'] ?? '').includes('application/vnd.mapbox-vector-tile')
+    const bodyIsBinary = isBinary(response.headers['content-type'] ?? '')
 
     /* istanbul ignore else */
     if (response.headers['content-length'] !== undefined) {
@@ -198,7 +199,7 @@ export default class Connection extends BaseConnection {
 
     this.diagnostic.emit('deserialization', null, options)
     try {
-      if (isCompressed || isVectorTile) { // eslint-disable-line
+      if (isCompressed || bodyIsBinary) { // eslint-disable-line
         let currentLength = 0
         const payload: Buffer[] = []
         for await (const chunk of response.body) {

test/unit/http-connection.test.ts

@@ -1113,6 +1113,28 @@ test('Support mapbox vector tile', async t => {
   server.stop()
 })
 
+test('Support Apache Arrow', async t => {
+  t.plan(1)
+
+  const binaryContent = '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'
+
+  function handler (req: http.IncomingMessage, res: http.ServerResponse) {
+    res.setHeader('Content-Type', 'application/vnd.apache.arrow.stream')
+    res.end(Buffer.from(binaryContent, 'base64'))
+  }
+
+  const [{ port }, server] = await buildServer(handler)
+  const connection = new HttpConnection({
+    url: new URL(`http://localhost:${port}`)
+  })
+  const res = await connection.request({
+    path: '/_query',
+    method: 'POST',
+  }, options)
+  t.equal(res.body.toString('base64'), Buffer.from(binaryContent, 'base64').toString('base64'))
+  server.stop()
+})
+
 test('Check server fingerprint (success)', async t => {
   t.plan(1)
 

test/unit/undici-connection.test.ts

@@ -983,6 +983,28 @@ test('Support mapbox vector tile', async t => {
   server.stop()
 })
 
+test('Support Apache Arrow', async t => {
+  t.plan(1)
+
+  const binaryContent = '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'
+
+  function handler (_req: http.IncomingMessage, res: http.ServerResponse) {
+    res.setHeader('Content-Type', 'application/vnd.apache.arrow.stream')
+    res.end(Buffer.from(binaryContent, 'base64'))
+  }
+
+  const [{ port }, server] = await buildServer(handler)
+  const connection = new UndiciConnection({
+    url: new URL(`http://localhost:${port}`)
+  })
+  const res = await connection.request({
+    path: '/_query',
+    method: 'POST',
+  }, options)
+  t.equal(res.body.toString('base64'), Buffer.from(binaryContent, 'base64').toString('base64'))
+  server.stop()
+})
+
 test('Check server fingerprint (success)', async t => {
   t.plan(1)