lazy load dsm only when needed

[rochdev]

What does this PR do?

Lazy load DSM only when needed.

Motivation

DSM loads a lot of code and some pretty heavy dependencies which increase startup time when not needed.

[rochdev]

The helpers in this file were copied from processor.js untouched.

[github-actions]

Overall package size

Self size: 8.77 MB
Deduped: 94.97 MB
No deduping: 95.48 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.4.0 | 29.44 MB | 29.44 MB | | @datadog/native-appsec | 8.4.0 | 19.25 MB | 19.26 MB | | @datadog/native-iast-taint-tracking | 3.3.0 | 13.77 MB | 13.78 MB | | @datadog/pprof | 5.5.1 | 9.79 MB | 10.17 MB | | protobufjs | 7.2.5 | 2.77 MB | 5.16 MB | | @datadog/native-iast-rewriter | 2.8.0 | 2.6 MB | 2.74 MB | | @opentelemetry/core | 1.14.0 | 872.87 kB | 1.47 MB | | @datadog/native-metrics | 3.1.0 | 1.06 MB | 1.46 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.11.2 | 112.74 kB | 835.4 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.0 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | shell-quote | 1.8.1 | 44.96 kB | 44.96 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.3.1 | 25.21 kB | 25.21 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | dc-polyfill | 0.1.4 | 23.1 kB | 23.1 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

Attention: Patch coverage is 78.78788% with 14 lines in your changes missing coverage. Please review.

Project coverage is 80.85%. Comparing base (96bb84a) to head (4d315a9).

Files with missing lines	Patch %	Lines
packages/dd-trace/src/datastreams/size.js	50.00%	12 Missing ⚠️
packages/dd-trace/src/tracer.js	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5305      +/-   ##
==========================================
- Coverage   80.94%   80.85%   -0.09%     
==========================================
  Files         488      489       +1     
  Lines       21844    21751      -93     
==========================================
- Hits        17681    17587      -94     
- Misses       4163     4164       +1     

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: lazy-load-dsm
Commit report: e5e535d
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 668 Passed, 0 Skipped, 15m 43.11s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-21 01:41:57

Comparing candidate commit 4d315a9 in PR branch lazy-load-dsm with baseline commit 96bb84a in branch master.

Found 1 performance improvements and 1 performance regressions! Performance is the same for 801 metrics, 14 unstable metrics.

scenario:spans-finish-later-22

• 🟩 instructions [-266.9M instructions; -211.8M instructions] or [-9.323%; -7.399%]

scenario:startup-with-tracer-22

• 🟥 execution_time [+13.617ms; +15.093ms] or [+5.875%; +6.512%]