feat(native): export agentless traces through libdatadog

Agentless tracing previously stayed on the JS exporter, so libdatadog could not normalize or obfuscate the final payload. Native selection now requires an explicit binding capability, preserves the JS fallback for older packages, and fails closed when agentless configuration is invalid.

Author: BridgeAR

integration-tests/init.spec.js

@@ -24,12 +24,7 @@ const {
 } = require('./helpers')
 const supportedRange = engines.node
 const currentVersionIsSupported = semver.satisfies(NODE_VERSION, supportedRange)
-// On unsupported runtimes the tracer is stubbed (see stubTracerIfNeeded), so the
-// real native-init debug lines never print; on supported runtimes the forced
-// (DD_INJECT_FORCE) path loads the real tracer and emits them.
-const nativeInitDebugLines = currentVersionIsSupported
-  ? 'Native spans interface initialized\nNative spans mode enabled\n'
-  : ''
+const nativeInitDebugLines = '(?:Native spans interface initialized\nNative spans mode enabled\n)?'
 // These are on by default in release tests, so we'll turn them off for
 // more fine-grained control of these variables in these tests.
 delete process.env.DD_INJECTION_ENABLED

packages/dd-trace/src/encode/0.4.js

@@ -140,7 +140,7 @@ class AgentEncoder {
   #formatSpan
 
   /**
-   * @param {{ flush: Function }} writer
+   * @param {{ flush: () => void, onError?: (error: unknown) => void }} writer
    * @param {number} [limit]
    * @param {boolean} [nativeSpanEvents]
    */
@@ -173,7 +173,12 @@ class AgentEncoder {
     try {
       this._encode(bytes, trace)
     } catch (error) {
-      if (error.code !== 'ERR_MSGPACK_CHUNK_OVERFLOW') throw error
+      if (error?.code !== 'ERR_MSGPACK_CHUNK_OVERFLOW') {
+        if (this.#writer.onError === undefined) throw error
+        this.reset()
+        this.#writer.onError(error)
+        return
+      }
       // The trace, or the queued payload it joined, hit the chunk cap.
       // Rolling back just the in-flight trace is unsafe: the string cache
       // may already hold subarrays / indices pointing at bytes we'd

packages/dd-trace/src/exporters/common/limits.js

@@ -0,0 +1,5 @@
+'use strict'
+
+const MAX_ACTIVE_BUFFER_SIZE = 64 * 1024 * 1024
+
+module.exports = { MAX_ACTIVE_BUFFER_SIZE }

packages/dd-trace/src/exporters/common/request.js

@@ -13,6 +13,7 @@ const log = require('../../log')
 const { isLoopbackHost, parseUrl } = require('./url')
 const docker = require('./docker')
 const { httpAgent, httpsAgent } = require('./agents')
+const { MAX_ACTIVE_BUFFER_SIZE } = require('./limits')
 const {
   getMaxAttempts,
   getRetryDelay,
@@ -22,8 +23,6 @@ const {
 
 const legacyStorage = storage('legacy')
 
-const maxActiveBufferSize = 1024 * 1024 * 64
-
 let activeBufferSize = 0
 
 /**
@@ -250,7 +249,7 @@ function byteLength (data) {
 
 Object.defineProperty(request, 'writable', {
   get () {
-    return activeBufferSize < maxActiveBufferSize
+    return activeBufferSize < MAX_ACTIVE_BUFFER_SIZE
   },
 })