collect tags

Author: tlhunter

packages/dd-trace/src/process-tags/index.js

@@ -0,0 +1,26 @@
+'use strict'
+
+const path = require('node:path')
+const pkg = require('../pkg')
+
+const CURRENT_WORKING_DIRECTORY = process.cwd()
+const ENTRYPOINT_PATH = require.main?.filename || ''
+
+module.exports = function processTags () {
+  return {
+    // last segment of the current working directory, e.g. /foo/bar/baz/ -> baz
+    'entrypoint.workdir': path.basename(CURRENT_WORKING_DIRECTORY),
+
+    // the entrypoint script filename without the extension, e.g. /foo/bar/baz/banana.js -> banana
+    'entrypoint.name': path.basename(ENTRYPOINT_PATH, path.extname(ENTRYPOINT_PATH)),
+
+    // always script for JavaScript applications
+    'entrypoint.type': 'script',
+
+    // the immediate parent directory name of the entrypoint script, e.g. /foo/bar/baz/banana.js -> baz
+    'entrypoint.basedir': path.basename(path.dirname(ENTRYPOINT_PATH)),
+
+    // the .name field from the application's package.json
+    'package.json.name': pkg.name
+  }
+}

packages/dd-trace/src/proxy.js

@@ -18,6 +18,7 @@ const {
   removeBaggageItem,
   removeAllBaggageItems
 } = require('./baggage')
+const getProcessTags = require('./process-tags')
 
 class LazyModule {
   constructor (provider) {
@@ -78,6 +79,7 @@ class Tracer extends NoopProxy {
     this.getAllBaggageItems = getAllBaggageItems
     this.removeBaggageItem = removeBaggageItem
     this.removeAllBaggageItems = removeAllBaggageItems
+    this.processTags = getProcessTags()
 
     // these requires must work with esm bundler
     this._modules = {